CN210317900U - Blade for axial flow fan - Google Patents
Blade for axial flow fan Download PDFInfo
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- CN210317900U CN210317900U CN201921173005.9U CN201921173005U CN210317900U CN 210317900 U CN210317900 U CN 210317900U CN 201921173005 U CN201921173005 U CN 201921173005U CN 210317900 U CN210317900 U CN 210317900U
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Abstract
The utility model discloses a blade for axial flow fan, including the blade surface and set up in the petiole of blade surface tail end, from blade surface head end to blade surface tail end, the blade surface divide into 7 sections arcs, and 7 sections arc length corresponding radius shorten gradually, between 7 sections arcs, adjacent arc length corresponding radius difference, less than or equal to 0.1 mm; the 7 sections of arcs respectively correspond to 7 sections of chord lengths, the length of the 7 sections of chord lengths is sequentially shortened, and the chord length difference between adjacent chord lengths is sequentially decreased from the head end of the leaf surface to the tail end of the leaf surface; the cross sections corresponding to the 7 sections of the arc are all provided with the maximum thickness, in the 7 sections of the arc, the maximum thickness ratio of the large cross section to the small cross section between any two sections of the cross sections is N, and the N is 10-30; the cross section corresponding to each arc section is of an airfoil structure. The utility model discloses well blade segmentation is obvious, and is rational in infrastructure, can enlarge the efficiency of blade, noise reduction.
Description
Technical Field
The utility model belongs to the technical field of the blade for the ventilator, concretely relates to blade for axial fan.
Background
The blades are important parts of the impeller assembly, and the structure, size, installation angle and the like of the blades with the impeller play a crucial role in the rotating speed, ventilation quantity, use efficiency and the like of the impeller.
In the prior art, blades are not reasonably divided, or integrally formed into a large arc structure, or designed into 2-4 sections; meanwhile, although the blades are divided into a plurality of arc-shaped sections, the working efficiency and the noise reduction effect of the blades are poor, and the working efficiency of the blades is low on the whole.
Disclosure of Invention
The to-be-solved technical problem of the utility model is that blade work efficiency is low, blade arc design is unreasonable, the utility model discloses a blade for axial flow fan has better work efficiency, and the arc structure of blade obtains reasonable division.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
the blade for the axial flow fan comprises a blade surface and a blade handle arranged at the tail end of the blade surface, wherein the blade surface is divided into 7 sections of arc shapes from the head end of the blade surface to the tail end of the blade surface, the radius corresponding to the arc length of 7 sections is gradually shortened, and the radius difference corresponding to the adjacent arc length between the 7 sections of arc shapes is less than or equal to 0.1 mm;
the 7 sections of arcs respectively correspond to 7 sections of chord lengths, the length of the 7 sections of chord lengths is sequentially shortened, and the chord length difference between adjacent chord lengths is sequentially decreased from the head end of the leaf surface to the tail end of the leaf surface;
the cross sections corresponding to the 7 sections of the arc are all provided with the maximum thickness, in the 7 sections of the arc, the maximum thickness ratio of the large cross section to the small cross section between any two sections of the cross sections is N, and the N is 10-30;
the cross section corresponding to each arc section is of an airfoil structure.
The blade is divided into 7 sections, so that the design of the blade is more accurate, and the precision of the blade design is improved. In the technical scheme, the cross section of the blade is of an airfoil structure, the airfoil structure has a large influence on aerodynamic performance and airflow in the design of the fan, when the airfoil moves relative to air, the surface of the airfoil is subjected to the acting force of the airflow, the component force of the resultant force in the motion direction or the incoming flow direction of the airfoil is the resistance force of the airfoil, and the component force perpendicular to the direction is the lifting force of the airfoil. Among this technical scheme, through the police of playing the part of the police that the adjustment arc length corresponds to and the chord length is poor, efficiency in the blade work obtains promoting, compares with prior art, still has certain noise reduction effect, specifically according to the design of airfoil, matches chord length and arc length etc. has realized raising the efficiency, the effect of noise reduction.
As the utility model discloses a further improvement, from blade surface head end to blade surface tail end, 7 sections the arc length corresponds 7 ratios, 7 respectively the ratio grow gradually, and the maximum ratio can not exceed 12.
In the present embodiment, after the maximum ratio is fixed, and the chord length is constant, the maximum thickness can be obtained, and further, the structural study of the airfoil and the structure of the blade formed by the airfoil have certain influence. By limiting the ratio, to a certain extent, the maximum thickness is limited, and the size and the position of the maximum airfoil shape can determine the length of the laminar flow section and further determine the frictional resistance; when the maximum ratio is defined, to a certain extent, the frictional resistance is defined, and noise reduction is achieved.
As a further improvement of the utility model, from the head end of the leaf surface to the tail end of the leaf surface, the ratio of 7 of the said ratios is 7-8:7.6-8.6:8.2-9.3: 8.8-9.8: 9.3-10.3:10.1-10.9:10.5-11.5.
Similarly, when the maximum ratio and the proportion are determined, the maximum thickness and the frictional resistance corresponding to each arc length are both limited, and a better idea and a better mode are provided for the design of the blade.
As the utility model discloses a further improvement, from blade surface head end to blade surface tail end, between 7 sections arc lengths, have the focus of horizontal direction and vertical direction respectively, just the focus of horizontal direction and vertical direction all is the reduction trend.
Due to the fact that the gravity center line is adjusted along the circumferential direction, the bending degree of the blade can be changed, the sweepback type can be changed, the load position and the pneumatic performance of the blade are changed, the direction of the gravity center line is roughly clear through the trend that the gravity center is reduced, and meanwhile, the effect of being applicable to the axial flow fan, improving the efficiency of the fan and reducing noise can be achieved by finding the direction of the gravity center line.
As a further improvement of the utility model, the ratio of the gravity center of the horizontal direction of the head end of the leaf surface to the gravity center of the horizontal direction of the tail end of the leaf surface is 95-100: 72-80.
The center of gravity ratio in the horizontal direction determines an approximate center of gravity of the horizontal position, and further influences the bending position of the blade, and the like.
As a further improvement of the utility model, the ratio of the gravity center of the vertical direction of the head end of the leaf surface to the gravity center of the vertical direction of the tail end of the leaf surface is 8-12: 6-10.
The vertical center-of-gravity ratio determines an approximate center of gravity of the vertical position, and further influences the bending position of the blade, and the like, and the vertical position of the approximate bending is defined by defining the center-of-gravity ratio.
As a further improvement of the utility model, from the head end of the leaf surface to the tail end of the leaf surface, 7 sections of the arc-shaped installation angle gradually become smaller, and the installation angle is in the range of 10-40 degrees;
as a further improvement of the utility model, the petiole is of a trapezoidal structure or a cylindrical structure.
As a further improvement, when the petiole is the trapezium structure, the leaf surface tail end is equipped with the section of twisting, the surface of the section of twisting is equipped with an arc structure at least.
When the blade is in a trapezoidal structure, the blade shank surface is not arc-shaped, so that the connection between the blade and the hub with the arc-shaped surface is unstable, and the twisting section on the arc-shaped surface is increased, so that the blade smoothly transits to the hub.
As a further improvement of the utility model, the petiole and the integrative setting of blade surface, or the petiole can be dismantled and connect in the blade surface tail end.
Each mode has certain advantages and disadvantages, and more user requirements are met and the application range of the system is expanded through two connection modes.
Through the technical scheme, the beneficial effects of the utility model are that:
the utility model discloses in, segment the blade, specifically divide into 7 sections for the design of blade is more accurate, improves the precision of blade design. In the technical scheme, the cross section of the blade is of an airfoil structure, the airfoil structure has a large influence on aerodynamic performance and airflow in the design of the fan, when the airfoil moves relative to air, the surface of the airfoil is subjected to the acting force of the airflow, the component force of the resultant force in the motion direction or the incoming flow direction of the airfoil is the resistance force of the airfoil, and the component force perpendicular to the direction is the lifting force of the airfoil. Among this technical scheme, through the police of playing the part of the police that the adjustment arc length corresponds to and the chord length is poor, efficiency in the blade work obtains promoting, compares with prior art, still has certain noise reduction effect, specifically according to the design of airfoil, matches chord length and arc length etc. has realized raising the efficiency, the effect of noise reduction.
In the application, according to the design principle of the blades, the aerodynamic shapes of the blades can be seen on the cross sections of the blades, and the blades can generate thrust to drive the fan to rotate; simultaneously, the wing section of this application ensures that the air current can not produce the vortex through the blade at an excessive speed, and the passing speed can not be too fast simultaneously, can not cause the energy waste. The thickness of this application design section can improve the efficiency of catching wind. And the whole blade is twisted, so that the windward angle is continuously changed, the optimal attack angle of the windward area of the blade is kept, the principle of the pneumatic design of the fan is met, the efficiency of the fan is improved due to the twisted angle, the thickness and the wing section details of the blade, and the noise pollution is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is one of schematic structural diagrams of a blade for an axial flow fan according to the present invention;
fig. 2 is a second schematic structural view of a blade for an axial flow fan according to the present invention;
fig. 3 is a third schematic structural view of a blade for an axial flow fan according to the present invention;
fig. 4 is a fourth schematic structural view of a blade for an axial flow fan according to the present invention;
fig. 5 is a fifth schematic structural view of a blade for an axial flow fan according to the present invention;
the corresponding part names indicated by the numbers and letters in the drawings:
1. leaf surfaces; 2. and (4) leaf stalks.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.
Example 1
Referring to the attached drawings 1-3, the utility model discloses a blade for an axial flow fan, which comprises a blade surface and a blade handle arranged at the tail end of the blade surface, wherein the blade surface is divided into 7 sections of arcs from the head end to the tail end of the blade surface, the radius corresponding to the 7 sections of arc lengths is gradually shortened, and the radius difference corresponding to the adjacent arc lengths between the 7 sections of arcs is less than or equal to 0.1 mm;
the 7 sections of arcs respectively correspond to 7 sections of chord lengths, the length of the 7 sections of chord lengths is sequentially shortened, and the chord length difference between adjacent chord lengths is sequentially decreased from the head end of the leaf surface to the tail end of the leaf surface;
the cross sections corresponding to the 7 sections of the arc are all provided with the maximum thickness, in the 7 sections of the arc, the maximum thickness ratio of the large cross section to the small cross section between any two sections of the cross sections is N, and the N is 10-30;
the cross section corresponding to each arc section is of an airfoil structure.
The blade is divided into 7 sections, so that the design of the blade is more accurate, and the precision of the blade design is improved. In the technical scheme, the cross section of the blade is of an airfoil structure, the airfoil structure has a large influence on aerodynamic performance and airflow in the design of the fan, when the airfoil moves relative to air, the surface of the airfoil is subjected to the acting force of the airflow, the component force of the resultant force in the motion direction or the incoming flow direction of the airfoil is the resistance force of the airfoil, and the component force perpendicular to the direction is the lifting force of the airfoil. Among this technical scheme, through the police of playing the part of the police that the adjustment arc length corresponds to and the chord length is poor, efficiency in the blade work obtains promoting, compares with prior art, still has certain noise reduction effect, specifically according to the design of airfoil, matches chord length and arc length etc. has realized raising the efficiency, the effect of noise reduction.
In the embodiment, because the radius difference corresponding to the arc length is relatively small, an arithmetic progression is almost formed, and the transition sections of the formed large arc are almost consistent or increase the same through the adjustment, so that the arc with the approximately same increase rate is formed; meanwhile, the chord length is shortened, the chord length difference is smaller and smaller from the connection of the chord length, the chord length difference is the largest at the beginning, and the chord length difference is just at the back of the airfoil structure, so that the laminar flow section of the boundary layer is increased, the friction is reduced, and the noise generated by the friction between the blade and the air is relieved. Because 7 sections are divided, relatively speaking, the number of the divided sections is large, and when the structure is improved, a more accurate structure can be obtained.
Example 2
Referring to fig. 1-5, in order to improve noise reduction, 7 arc lengths correspond to 7 ratios from the head end of the blade surface 1 to the tail end of the blade surface 1, the 7 ratios are gradually increased, and the maximum ratio cannot exceed 12.
In the present embodiment, after the maximum ratio is fixed, and the chord length is constant, the maximum thickness can be obtained, and further, the structural study of the airfoil and the structure of the blade formed by the airfoil have certain influence. By limiting the ratio, to a certain extent, the maximum thickness is limited, and the size and the position of the maximum airfoil shape can determine the length of the laminar flow section and further determine the frictional resistance; when the maximum ratio is defined, to a certain extent, the frictional resistance is defined, and noise reduction is achieved.
Specifically, from the head end of the leaf surface 1 to the tail end of the leaf surface 1, the ratio of 7 of the ratios is 7-8:7.6-8.6:8.2-9.3: 8.8-9.8: 9.3-10.3:10.1-10.9:10.5-11.5.
Similarly, when the maximum ratio and the proportion are determined, the maximum thickness and the frictional resistance corresponding to each arc length are both limited, and a better idea and a better mode are provided for the design of the blade.
Further, from 1 head end of blade surface to 1 tail end of blade surface, between 7 sections arc lengths, have the focus of horizontal direction and vertical direction respectively, just the focus of horizontal direction and vertical direction all is the reduction trend.
Due to the fact that the gravity center line is adjusted along the circumferential direction, the bending degree of the blade can be changed, the sweepback type can be changed, the load position and the pneumatic performance of the blade are changed, the direction of the gravity center line is roughly clear through the trend that the gravity center is reduced, and meanwhile, the effect of being applicable to the axial flow fan, improving the efficiency of the fan and reducing noise can be achieved by finding the direction of the gravity center line.
Specifically, the ratio of the gravity center of the horizontal direction of the head end of the leaf surface 1 to the gravity center of the horizontal direction of the tail end of the leaf surface 1 is 95-100: 72-80.
The center of gravity ratio in the horizontal direction determines an approximate center of gravity of the horizontal position, and further influences the bending position of the blade, and the like.
Specifically, the ratio of the gravity center of the blade surface 1 in the vertical direction to the gravity center of the blade surface 1 in the vertical direction is 8-12: 6-10.
The vertical center-of-gravity ratio determines an approximate center of gravity of the vertical position, and further influences the bending position of the blade, and the like, and the vertical position of the approximate bending is defined by defining the center-of-gravity ratio.
Further, from the head end of the blade surface 1 to the tail end of the blade surface 1, 7 sections of the arc-shaped installation angles are gradually reduced, and the installation angles range from 10 degrees to 40 degrees;
in order to match various installation modes, in the embodiment, the petiole 2 is in a trapezoidal structure or a cylindrical structure. In the drawings of the embodiment, the petiole 2 is in a trapezoidal structure; when the hub is of a cylindrical structure, the hub can be provided with two circular truncated cone structures and a connecting section, at the moment, the circular truncated cone structures are arranged at two ends, the connecting section is arranged in the middle, during installation, one circular truncated cone structure is exposed out of the hub, and one circular truncated cone structure and the connecting section are arranged and inserted into the hub.
In this embodiment, when the petiole 2 is a trapezoid structure, the tail end of the leaf surface 1 is provided with a twisted section, and the surface of the twisted section is provided with at least one arc-shaped structure.
When the blade is in a trapezoidal structure, the surface of the blade handle 2 is not arc-shaped, so that the blade is connected to the hub with the arc-shaped surface unstably, and the twisted section of the arc-shaped surface is increased, so that the blade is smoothly transited to the hub.
Specifically, the petiole 2 and the leaf surface 1 are integrally arranged, or the petiole 2 can be detachably connected to the tail end of the leaf surface 1.
Each mode has certain advantages and disadvantages, and more user requirements are met and the application range of the system is expanded through two connection modes.
Example 3
In this embodiment, the blades are formed according to the performance parameter settings in table 1, specifically, R represents a circle radius corresponding to each arc, and B represents a chord length corresponding to the arc; c represents the ratio of arcs; GX and GY represent the center of gravity of the arc, and BETA represents the installation angle of the arc.
Table 1 shows the performance parameters of the blade in this embodiment.
Wherein BETA is installation angle.
Table 1:
| location/parameter | Radius of | Chord length | Ratio of | GX | | BETA |
| Paragraph | ||||||
| 1 | 350.0 | 227.34 | 11.2 | 97.70 | 10.64 | 34.67 |
| |
458.33 | 209.91 | 10.4 | 90.20 | 9.82 | 26.45 |
| Paragraph 3 | 566.67 | 198.00 | 9.8 | 85.09 | 9.27 | 21.33 |
| Paragraph 4 | 675.00 | 191.00 | 9.3 | 82.08 | 8.94 | 17.80 |
| Paragraph 5 | 783.33 | 186.50 | 8.7 | 80.14 | 8.73 | 15.17 |
| Paragraph 6 | 891.67 | 183.00 | 8.1 | 78.64 | 8.56 | 13.11 |
| Paragraph 7 | 1000 | 181.00 | 7.5 | 77.78 | 8.47 | 11.44 |
The efficiency of the fan is higher than that of other fans in actual use of the blade obtained through the parameters in the table 1; meanwhile, the noise reduction effect is obvious. In this embodiment, the petiole 2 and the leaf surface 1 are integrally arranged, or the petiole 2 can be detachably connected to the tail end of the leaf surface 1.
The leaf surface 1 and the leaf stalk 2 are installed in a plurality of matching modes, so that the application scene can be enlarged, and the application range can be expanded.
In the application, according to the design principle of the blades, the aerodynamic shapes of the blades can be seen on the cross sections of the blades, and the blades can generate thrust to drive the fan to rotate; simultaneously, the wing section of this application ensures that the air current can not produce the vortex through the blade at an excessive speed, and the passing speed can not be too fast simultaneously, can not cause the energy waste. The thickness of this application design section can improve the efficiency of catching wind. And the whole blade is twisted, so that the windward angle is continuously changed, the optimal attack angle of the windward area of the blade is kept, the principle of the pneumatic design of the fan is met, the efficiency of the fan is improved due to the twisted angle, the thickness and the wing section details of the blade, and the noise pollution is reduced.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The blade for the axial flow fan comprises a blade surface (1) and a blade handle (2) arranged at the tail end of the blade surface (1) and used for blade installation, and is characterized in that the blade surface (1) is divided into 7 sections of arcs from the head end of the blade surface (1) to the tail end of the blade surface (1), the radius corresponding to the 7 sections of arc lengths is gradually shortened, and the radius difference corresponding to the adjacent arc lengths is less than or equal to 0.1mm between the 7 sections of arcs;
the 7 sections of arcs respectively correspond to 7 sections of chord lengths, the length of the 7 sections of chord lengths is sequentially shortened, and the chord length difference between adjacent chord lengths is sequentially decreased from the head end of the blade surface (1) to the tail end of the blade surface (1);
the cross sections corresponding to the 7 sections of the arc are all provided with the maximum thickness, in the 7 sections of the arc, the maximum thickness ratio of the large cross section to the small cross section between any two sections of the cross sections is N, and the N is 10-30;
the cross section corresponding to each arc section is of an airfoil structure.
2. The blade for an axial flow fan as claimed in claim 1, wherein the arc lengths of 7 sections from the head end of the blade surface (1) to the tail end of the blade surface (1) correspond to 7 ratios, the 7 ratios are gradually increased, and the maximum ratio cannot exceed 12.
3. A blade for an axial flow fan according to claim 2, characterised in that the ratio between 7 of said ratios is 7-8:7.6-8.6:8.2-9.3: 8.8-9.8: 9.3-10.3:10.1-10.9:10.5-11.5.
4. The blade for the axial flow fan as claimed in claim 1, wherein 7 arc lengths from the head end of the blade surface (1) to the tail end of the blade surface (1) respectively have a gravity center in the horizontal direction and a gravity center in the vertical direction, and the gravity centers in the horizontal direction and the vertical direction are in a decreasing trend.
5. The blade for an axial flow fan according to claim 4, wherein the ratio of the center of gravity of the blade surface (1) in the horizontal direction at the head end to the center of gravity of the blade surface (1) in the horizontal direction at the tail end is 95-100: 72-80.
6. The blade for an axial flow fan according to claim 5, wherein the ratio of the center of gravity in the vertical direction of the head end of the blade surface (1) to the center of gravity in the vertical direction of the tail end of the blade surface (1) is 8-12: 6-10.
7. The blade for the axial flow fan according to claim 1, wherein the 7 sections of the arc-shaped installation angles gradually decrease from the head end of the blade surface (1) to the tail end of the blade surface (1), and the installation angles range from 10 degrees to 40 degrees.
8. The blade for an axial flow fan of claim 1, wherein the blade shank has a trapezoidal structure or a cylindrical structure.
9. The blade for the axial flow fan as claimed in claim 8, wherein when the blade shank (2) is of a trapezoidal structure, the tail end of the blade surface (1) is provided with a twisted section, and the surface of the twisted section is provided with at least one arc structure.
10. A blade for an axial flow fan according to any of claims 1-9, characterised in that the blade stem (2) is integrated in the blade surface (1) or that the blade stem (2) is detachably connected to the trailing end of the blade surface (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921173005.9U CN210317900U (en) | 2019-07-24 | 2019-07-24 | Blade for axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921173005.9U CN210317900U (en) | 2019-07-24 | 2019-07-24 | Blade for axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210317900U true CN210317900U (en) | 2020-04-14 |
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ID=70125535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921173005.9U Active CN210317900U (en) | 2019-07-24 | 2019-07-24 | Blade for axial flow fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210317900U (en) |
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2019
- 2019-07-24 CN CN201921173005.9U patent/CN210317900U/en active Active
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