CN112664465A - Axial flow fan - Google Patents
Axial flow fan Download PDFInfo
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- CN112664465A CN112664465A CN201910984736.XA CN201910984736A CN112664465A CN 112664465 A CN112664465 A CN 112664465A CN 201910984736 A CN201910984736 A CN 201910984736A CN 112664465 A CN112664465 A CN 112664465A
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- negative pressure
- positive pressure
- pressure surface
- blades
- inlet end
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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
Abstract
The invention provides an axial flow fan which comprises a hub and a plurality of fan blade groups. The hub is used for rotating around a central axis and is provided with a positive pressure side and a negative pressure side which are opposite. The fan blade groups are arranged around the hub. Each fan blade group comprises at least two blades. In each fan blade group, each blade is provided with an air inlet end, an air outlet end opposite to the air inlet end, a negative pressure surface and a positive pressure surface opposite to the negative pressure surface. The air outlet end of one of the two adjacent blades corresponds to the air inlet end of the other of the two adjacent blades. The negative pressure surface of one of the two adjacent blades corresponds to the positive pressure surface of the other of the two adjacent blades. A gap is formed between the negative pressure surface of one of the two adjacent blades and the positive pressure surface of the other of the two adjacent blades.
Description
Technical Field
The present disclosure relates to fans, and particularly to an axial fan.
Background
In the conventional axial flow fan, the airfoil design of the blade section is related to the generation condition of the separated flow. When the axial fan generates the separation flow, the separation flow can cause the axial fan to stall, so that the axial fan idles and cannot drive air, thereby reducing the heat dissipation efficiency. In addition, turbulence can be created and disturbing noise can be created. Therefore, reducing the generation of the separated flow is important for the axial flow fan.
Disclosure of Invention
The invention provides an axial flow fan, which can solve the problem that the conventional axial flow fan is easy to generate separated flow to cause idle running of the axial flow fan.
The invention relates to an axial flow fan which comprises a hub and a plurality of fan blade groups. The hub is used for rotating around a central axis and is provided with a positive pressure side and a negative pressure side which are opposite. The fan blade groups are arranged around the hub. Each fan blade group comprises at least two blades. In each fan blade group, each blade is provided with an air inlet end, an air outlet end opposite to the air inlet end, a negative pressure surface and a positive pressure surface opposite to the negative pressure surface. The minimum distance between the wind inlet end of one of the two adjacent blades and the positive pressure side is larger than the minimum distance between the wind inlet end of the other of the two adjacent blade surfaces and the positive pressure side. The minimum distance between the air outlet end of one of the two adjacent blades and the negative pressure side is smaller than the minimum distance between the air outlet end of the other of the two adjacent blades and the negative pressure side. The air outlet end of one of the two adjacent blades corresponds to the air inlet end of the other of the two adjacent blades. The negative pressure surface of one of the two adjacent blades corresponds to the positive pressure surface of the other of the two adjacent blades. A gap is formed between the negative pressure surface of one of the two adjacent blades and the positive pressure surface of the other of the two adjacent blades.
In an embodiment of the invention, in each of the fan blade sets, the air inlet end of each of the blades is connected between the positive pressure surface and the negative pressure surface. The air outlet end of each blade is connected between the positive pressure surface and the negative pressure surface. The suction surface of each vane is relatively close to the suction side. The positive pressure surface of each vane is relatively close to the positive pressure side. The minimum distance between the air inlet end of each blade and the positive pressure side is greater than the minimum distance between the air outlet end of each blade and the positive pressure side.
In an embodiment of the invention, in each of the vane sets, a curvature of a suction surface of one of the adjacent two vanes is larger than a curvature of a suction surface of the other of the adjacent two vanes.
In an embodiment of the invention, in each of the fan blade sets, curvatures of the negative pressure surfaces of the blades are different from each other.
In an embodiment of the invention, in each of the fan blade sets, the curvature of the negative pressure surfaces of the blades decreases as the distance between the wind inlet ends and the positive pressure side of the blades decreases.
In an embodiment of the invention, the material of the blades includes metal.
In an embodiment of the invention, the blade has a uniform thickness or a non-uniform thickness.
In an embodiment of the invention, in each of the above-mentioned fan blade sets, orthographic projections of the fan blades on any plane perpendicular to the central axis do not overlap each other.
In an embodiment of the invention, in each of the fan blade sets, the negative pressure surface of one of the two adjacent blades defines a tangent line at a limit close to the wind inlet end. The negative pressure surface of the other of the two adjacent blades defines another tangent line at the limit near the wind inlet end. The slope of the other tangent is greater than the slope of the tangent.
In an embodiment of the invention, in each of the fan blade sets, the negative pressure surface of each blade defines a first tangent line at a limit close to the wind inlet end. The suction surface of each blade defines a second tangent at a limit adjacent the outlet end. The slope of the second tangent is greater than the slope of the first tangent.
In an embodiment of the invention, the hub rotates around the central axis along a first direction. Each blade is bent along the second direction. The first direction is opposite to the second direction.
In an embodiment of the invention, in each of the fan blade groups, one of the adjacent two blades to the other of the adjacent two blades are arranged along the second direction.
In an embodiment of the invention, an area of an orthographic projection of the other one of the two adjacent blades on any plane perpendicular to the central axis is larger than an area of an orthographic projection of the one of the two adjacent blades on any plane perpendicular to the central axis.
In an embodiment of the invention, each of the fan blade sets includes a first blade, a second blade and a third blade. The first blade is connected with the hub and is provided with a first air inlet end, a first negative pressure surface, a first air outlet end and a first positive pressure surface which are sequentially connected. The second blade is connected with the hub and is provided with a second air inlet end, a second negative pressure surface, a second air outlet end and a second positive pressure surface which are sequentially connected. The third blade is connected with the hub and is provided with a third air inlet end, a third negative pressure surface, a third air outlet end and a third positive pressure surface which are sequentially connected. A first minimum distance between the first air inlet end and the positive pressure side is greater than a second minimum distance between the second air inlet end and the positive pressure side. The second minimum distance between the second air inlet end and the positive pressure side is greater than the third minimum distance between the third air inlet end and the positive pressure side. The fourth minimum distance between the first air outlet end and the negative pressure side is smaller than the fifth minimum distance between the second air outlet end and the negative pressure side. The fifth minimum distance between the second air outlet end and the negative pressure side is smaller than the sixth minimum distance between the third air outlet end and the negative pressure side. The first air outlet end corresponds to the second air inlet end. The second air outlet end corresponds to the third air inlet end. The first negative pressure surface corresponds to the second positive pressure surface, and a first gap is formed between the first negative pressure surface and the second positive pressure surface. The second negative pressure surface corresponds to the third positive pressure surface, and a second gap is formed between the second negative pressure surface and the third positive pressure surface.
In an embodiment of the invention, the first negative pressure surface, the second negative pressure surface and the third negative pressure surface are relatively close to the negative pressure side. The first positive pressure surface, the second positive pressure surface and the third positive pressure surface are relatively close to the positive pressure side. The first minimum distance between the first air inlet end and the positive pressure side is greater than the seventh minimum distance between the first air outlet end and the positive pressure side. The second minimum distance between the second air inlet end and the positive pressure side is greater than the eighth minimum distance between the second air outlet end and the positive pressure side. The third minimum distance between the third air inlet end and the positive pressure side is greater than the ninth minimum distance between the third air outlet end and the positive pressure side.
In an embodiment of the invention, a central plane is defined at a position right in the middle between the negative pressure side and the positive pressure side of the hub. The first vane is adjacent to the suction side. The second blade passes through the central plane. The third blade is close to the positive pressure side.
In an embodiment of the invention, a connection between the first air inlet end and the first negative pressure surface defines a first negative pressure point. And a second negative pressure point is defined at the joint between the second air inlet end and the second negative pressure surface. And a third negative pressure point is defined at the joint between the third air inlet end and the third negative pressure surface. And a fourth negative pressure point is defined at the joint between the third air outlet end and the third negative pressure surface. The joint between the first air inlet end and the first positive pressure surface defines a first positive pressure point. The joint between the first air outlet end and the first positive pressure surface defines a second positive pressure point. And a third positive pressure point is defined at the joint between the second air outlet end and the positive pressure surface. And a fourth positive pressure point is defined at the joint between the third air outlet end and the positive pressure surface. A first connecting line is defined among the first negative pressure point, the second negative pressure point, the third negative pressure point and the fourth negative pressure point. A second connecting line is defined between the fourth negative pressure point and the fourth positive pressure point. A third connecting line is defined among the first positive pressure point, the second positive pressure point, the third positive pressure point and the fourth positive pressure point. A fourth connecting line is defined between the first negative pressure point and the first positive pressure point. The first connecting line, the second connecting line, the third connecting line and the fourth connecting line surround to form an airfoil.
In view of the above, in the axial flow fan of the present invention, the effects of reducing the generation of the separated flow and reducing the noise can be achieved.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1A is a perspective view of an axial flow fan according to an embodiment of the present invention;
FIG. 1B is a side schematic view of the axial fan of FIG. 1A;
FIG. 1C is a schematic top view of the axial fan of FIG. 1A;
FIGS. 2A and 2B are schematic cross-sectional views taken along line A-A in FIG. 1C;
FIGS. 3A and 3B are schematic cross-sectional views of FIG. 1C taken along section lines B-B;
FIG. 4 shows a schematic view of an orthographic projection of each vane of the vane set of FIG. 1C on a central plane.
Description of the reference numerals
100: axial flow fan
110: wheel hub
111: negative pressure side
112: positive pressure side
120: fan blade set
121: first blade
121 a: the first air inlet end
121 b: first air outlet end
121 c: first negative pressure surface
121 d: first positive pressure surface
122: second blade
122 a: the second air inlet end
122 b: second air outlet end
122 c: second negative pressure surface
122 d: second positive pressure surface
123: third blade
123 a: third air inlet end
123 b: third air outlet end
123 c: third negative pressure surface
123 d: third positive pressure surface
AX: central axis
And (3) CP: center plane
D1: first minimum distance
D2: second minimum distance
D3: third minimum distance
D4: fourth minimum distance
D5: fifth minimum distance
D6: sixth minimum distance
D7: seventh minimum distance
D8: eighth minimum distance
D9: ninth minimum distance
G1: first gap
G2: second gap
L1: first connecting line
L2: second connecting line
L3: third connecting line
L4: fourth connecting line
NP 1: first negative pressure point
NP 2: second negative pressure point
NP 3: third negative pressure point
NP 4: fourth negative pressure point
PP 1: first positive pressure point
PP 2: second positive pressure point
PP 3: third positive pressure point
PP 4: fourth positive pressure point
PR 1: first orthographic projection
PR 2: second orthographic projection
PR 3: third orthographic projection
R1: a first direction
R2: second direction
T11, T12: first tangent line
T21, T22: second tangent line
T31, T32: third tangent line
Detailed Description
Fig. 1A is a perspective view of an axial flow fan according to an embodiment of the invention. FIG. 1B is a side schematic view of the axial flow fan of FIG. 1A. Fig. 1C is a schematic top view of the axial flow fan of fig. 1A. Referring to fig. 1A, fig. 1B and fig. 1C, an axial fan 100 of the present embodiment includes a hub 110 and a plurality of fan blade sets 120. The hub 110 is configured to rotate around a central axis AX, and has a negative pressure side 111 and a positive pressure side 112 opposite to the negative pressure side 111. The plurality of fan blade sets 120 are disposed around the hub 110, and each fan blade set 120 is connected to the hub 110. For simplicity, only one of the fan blade sets 120 will be described below.
Specifically, the fan blade set 120 includes a first blade 121, a second blade 122, and a third blade 123, which are all connected to the hub 110. A central plane CP is defined at a midpoint between the suction side 111 and the pressure side 112 of the hub 110. The first vane 121 is relatively closer to the suction side 111. The second vane 122 passes through the center plane CP. The third vane 123 is relatively closer to the positive pressure side 112.
Of course, the present embodiment does not limit the positions of the first blade 121, the second blade 122, and the third blade 123. For example, the first blade 121, the second blade 122, and the third blade 123 may all be disposed near the negative pressure side 111, or may all be disposed near the positive pressure side 112, or may all be disposed through the central plane CP, as desired.
In addition, the present embodiment does not limit the number of blades included in the fan blade group 120. For example, the fan blade set 120 may have at least two blades, and the arrangement is not limited, depending on the requirement.
Fig. 2A and 2B are schematic cross-sectional views taken along a-a section line in fig. 1C. Fig. 3A and 3B are schematic cross-sectional views of fig. 1C taken along the B-B cut line. Referring to fig. 1A, fig. 1C, fig. 2A and fig. 3A, the first blade 121 has a first air inlet end 121A, a first negative pressure surface 121C, a first air outlet end 121b and a first positive pressure surface 121d connected in sequence. The first air outlet end 121b is opposite to the first air inlet end 121a, and the first positive pressure surface 121d is opposite to the first negative pressure surface 121 c. The first inlet end 121a has a first minimum distance D1 from the positive pressure side 112. A fourth minimum distance D4 is between the first outlet end 121b and the negative pressure side 111. A seventh minimum distance D7 is between the first outlet end 121b and the positive pressure side 112.
On the other hand, the second blade 122 has a second air inlet end 122a, a second negative pressure surface 122c, a second air outlet end 122b and a second positive pressure surface 122d connected in sequence. The second air outlet end 122b is opposite to the second air inlet end 122a, and the second positive pressure surface 122d is opposite to the second negative pressure surface 122 c. The second inlet end 122a has a second minimum distance D2 from the positive pressure side 112. A fifth minimum distance D5 is between the second outlet end 122b and the negative pressure side 111. An eighth minimum distance D8 is provided between the second outlet end 122b and the positive pressure side 112.
Furthermore, the third blade 123 has a third air inlet 123a, a third negative pressure surface 123c, a third air outlet 123b and a third positive pressure surface 123d connected in sequence. The third air outlet end 123b is opposite to the third air inlet end 123a, and the third positive pressure surface 123d is opposite to the third negative pressure surface 123 c. The third inlet end 123a is spaced a third minimum distance D3 from the positive pressure side 112. A sixth minimum distance D6 is between the third outlet end 123b and the negative pressure side 111. A ninth minimum distance D9 is provided between the third outlet end 123b and the positive pressure side 112.
In the present embodiment, the first minimum distance D1 is greater than the second minimum distance D2, and the second minimum distance D2 is greater than the third minimum distance D3. Sixth minimum distance D6 is greater than fifth minimum distance D5, and fifth minimum distance D5 is greater than fourth minimum distance D4. Namely, D1> D2> D3, and D6> D5> D4. The first minimum distance D1 is greater than the seventh minimum distance D7, the second minimum distance D2 is greater than the eighth minimum distance D8, and the third minimum distance D3 is greater than the ninth minimum distance D9. Namely, D1> D7, D2> D8, and D3> D9.
Referring to fig. 1A, fig. 1C, fig. 2A and fig. 3A, the first suction surface 121C, the second suction surface 122C and the third suction surface 123C refer to surfaces relatively close to the suction side 111. The first positive pressure surface 121d, the second positive pressure surface 122d, and the third positive pressure surface 123d are surfaces relatively close to the positive pressure side 112.
In the present embodiment, the first air outlet end 121b corresponds to the second air inlet end 122a, and the second air outlet end 122b corresponds to the third air inlet end 123 a. The first suction surface 121c corresponds to the second positive pressure surface 122d, and a first gap G1 is provided between the first suction surface 121c and the second positive pressure surface 122 d. The second suction surface 122c corresponds to the third positive pressure surface 123d, and a second gap G2 is provided between the second suction surface 122c and the third positive pressure surface 123 d.
With the above arrangement, the airflow can sequentially pass through the first negative pressure surface 121c, the second positive pressure surface 122d and the positive pressure side 112 from the negative pressure side 111, thereby reducing the probability of the first negative pressure surface 121c generating the separated flow and reducing the noise. Moreover, the airflow can sequentially pass through the second negative pressure surface 122c, the third positive pressure surface 123d and the positive pressure side 112 from the negative pressure side 111, so that the probability of generating a separation flow on the second negative pressure surface 122c is reduced, and the noise is reduced.
Referring to fig. 2A and 3A, the first negative pressure surface 121c, the second negative pressure surface 122c and the third negative pressure surface 123c are curved surfaces, and the curvature of the first negative pressure surface 121c, the curvature of the second negative pressure surface 122c and the curvature of the third negative pressure surface 123c are different.
For example, the curvature of the first negative pressure surface 121c is larger than that of the second negative pressure surface 122c, and the curvature of the second negative pressure surface 122c is larger than that of the third negative pressure surface 123 c. In other words, among the plurality of blades of each fan blade group 120, the curvature of the blade closer to the positive pressure side 112 is lower. Conversely, the closer the blade is to the negative pressure side 111, the higher the curvature.
Referring to fig. 1A, 2B and 3B, a first negative pressure point NP1 is defined at a connection point between the first air inlet end 121A and the first negative pressure surface 121c, a second negative pressure point NP2 is defined at a connection point between the second air inlet end 122a and the second negative pressure surface 122c, a third negative pressure point NP3 is defined at a connection point between the third air inlet end 123a and the third negative pressure surface 123c, and a fourth negative pressure point NP4 is defined at a connection point between the third air outlet end 123B and the third negative pressure surface 123 c. A first line L1 is defined between the first negative pressure point NP1, the second negative pressure point NP2, the third negative pressure point NP3 and the fourth negative pressure point NP 4.
On the other hand, a connection between the first air inlet end 121a and the first positive pressure surface 121d defines a first positive pressure point PP1, a connection between the first air outlet end 121b and the first positive pressure surface 121d defines a second positive pressure point PP2, a connection between the second air outlet end 122b and the second positive pressure surface 122d defines a third positive pressure point PP3, and a connection between the third air outlet end 123b and the third positive pressure surface 123d defines a fourth positive pressure point PP 4. A third line L3 is defined between the first positive pressure point PP1, the second positive pressure point PP2, the third positive pressure point PP3, and the fourth positive pressure point PP 4.
In addition, a second line L2 is defined between the fourth negative pressure point NP4 and the fourth positive pressure point PP4, and a fourth line L4 is defined between the first negative pressure point NP1 and the first positive pressure point PP 1. The first connecting line L1, the second connecting line L2, the third connecting line L3 and the fourth connecting line L4 surround to form an airfoil shape. The blade set 120 of the present embodiment has an airfoil design to replace a single blade of a conventional axial fan, so as to reduce the generation of the separated flow of the axial fan and prevent the axial fan 100 from stalling during rotation.
Referring to fig. 1A, fig. 2B and fig. 3B, the first negative pressure surface 121c of the first blade 121 defines a first tangent T11 at a limit close to the first air inlet end 121A, and the first negative pressure surface 121c defines a first tangent T12 at a limit close to the first air outlet end 121B. The second negative pressure surface 122c defines a second tangent T21 at a limit near the second air inlet end 122a, and the second negative pressure surface 122c defines a second tangent T22 at a limit near the second air outlet end 122 b. The third negative pressure surface 123c defines a third tangent T31 at a limit near the third air inlet end 123a, and the third negative pressure surface 123c defines a third tangent T32 at a limit near the third air outlet end 123 b.
In the present embodiment, the slope of the first tangent line T12 is greater than the slope of the first tangent line T11, the slope of the second tangent line T22 is greater than the slope of the second tangent line T21, and the slope of the third tangent line T32 is greater than the slope of the third tangent line T31. In addition, the slope of the first tangent line T11 is greater than the slope of the second tangent line T21, and the slope of the second tangent line T21 is greater than the slope of the third tangent line T31.
In the embodiment, the first blade 121, the second blade 122 and the third blade 123 are made of metal, and the first blade 121, the second blade 122 and the third blade 123 can be manufactured by stamping and have uniform thickness.
In other embodiments, the first blade 121, the second blade 122 and the third blade 123 may be made of common plastic and have non-uniform thickness, depending on the requirement.
Referring to fig. 1A, 1B and 1C, in the present embodiment, the hub 110 rotates around the central axis AX along a first direction R1 (e.g., clockwise), and the first blade 121, the second blade 122 and the third blade 123 bend along a second direction R2 (e.g., counterclockwise) to form a swept-back configuration. The first blade 121, the second blade 122 and the third blade 123 are sequentially arranged along the second direction R2.
FIG. 4 shows a schematic view of an orthographic projection of each vane of the vane set of FIG. 1C on a central plane. Referring to fig. 1B, 1C and 4, the first blade 121 has a first orthographic projection PR1 on the central plane CP. The second blade 122 has a second orthographic projection PR2 on the central plane CP. The third blade 123 has a third orthographic projection PR3 on the central plane CP. The first orthographic projection PR1, the second orthographic projection PR2 and the third orthographic projection PR3 do not overlap each other.
In the present embodiment, the area of the third orthogonal projection PR3 is larger than that of the second orthogonal projection PR2, and the area of the second orthogonal projection PR2 is larger than that of the first orthogonal projection PR 1. In other words, in the fan blade set 120 of the backward-swept type in the present embodiment, the area of the orthographic projection of the blade arranged behind in the second direction R2 on the central plane CP is larger than the area of the orthographic projection of the blade arranged in the front in the second direction R2 on the central plane CP.
In other embodiments, not shown, the first blade, the second blade, and the third blade may also be bent along the first direction to form a forward-swept configuration. The forward-swept fan blade group has the advantage that the area of the orthographic projection of the blades arranged behind in the second direction on the central plane is smaller than the area of the orthographic projection of the blades arranged in the front in the second direction on the central plane.
In summary, in the axial flow fan of the present invention, the airflow can sequentially pass through the first negative pressure surface, the second positive pressure surface and the positive pressure side from the negative pressure side, so as to reduce the probability of generating the separated flow on the first negative pressure surface and reduce the noise. Moreover, the airflow can sequentially pass through the second negative pressure surface, the third positive pressure surface and the positive pressure side from the negative pressure side, so that the probability of generating separated flow on the second negative pressure surface is reduced, and the noise is reduced.
In addition, the airfoil design of the fan blade set is used for replacing a single blade of the traditional axial flow fan, thereby reducing the generation of the separated flow of the axial flow fan and avoiding the stalling of the axial flow fan during rotation.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (17)
1. An axial flow fan comprising:
a hub for rotation about a central axis and having opposite negative and positive pressure sides; and
a plurality of fan blade groups disposed around the hub, wherein each of the fan blade groups includes at least two blades, each of the blades in each of the fan blade groups has an air inlet end, an air outlet end opposite to the air inlet end, a negative pressure surface, and a positive pressure surface opposite to the negative pressure surface, wherein a minimum distance between the air inlet end and the positive pressure side of one of the adjacent two blades is greater than a minimum distance between the air inlet end and the positive pressure side of the other of the adjacent two blades, a minimum distance between the air outlet end and the negative pressure side of one of the adjacent two blades is smaller than a minimum distance between the air outlet end and the negative pressure side of the other of the adjacent two blades, the air outlet end of one of the adjacent two blades corresponds to the air inlet end of the other of the adjacent two blades, and the negative pressure surface of one of the adjacent two blades corresponds to the positive pressure surface of the other of the adjacent two blades, and a gap is formed between the negative pressure surface of one of the two adjacent blades and the positive pressure surface of the other of the two adjacent blades.
2. The axial fan according to claim 1, wherein in each of the fan blade groups, the air inlet end of each of the blades is connected between the positive pressure surface and the negative pressure surface, the air outlet end of each of the blades is connected between the positive pressure surface and the negative pressure surface, the negative pressure surface of each of the blades is relatively close to the negative pressure side, the positive pressure surface of each of the blades is relatively close to the positive pressure side, and a minimum distance between the air inlet end and the positive pressure side of each of the blades is greater than a minimum distance between the air outlet end and the positive pressure side of each of the blades.
3. The axial fan according to claim 1, wherein in each of the fan blade groups, the curvature of the negative pressure surface of one of the adjacent two blades is larger than the curvature of the negative pressure surface of the other of the adjacent two blades.
4. The axial fan according to claim 1, wherein in each of the fan blade groups, curvatures of the plurality of negative pressure surfaces of the plurality of blades are different from each other.
5. The axial fan according to claim 1, wherein in each of the fan blade groups, a curvature of the plurality of negative pressure surfaces of the plurality of blades decreases as a distance between the plurality of wind inlet ends of the plurality of blades and the positive pressure side decreases.
6. The axial fan according to claim 1, wherein a material of the plurality of blades includes a metal.
7. The axial fan according to claim 1, wherein the blades have a uniform thickness or have a non-uniform thickness.
8. The axial fan according to claim 1, wherein in each of the fan blade groups, orthographic projections of the plurality of blades on any one plane perpendicular to the central axis do not overlap with each other.
9. The axial fan according to claim 1, wherein in each of the fan blade groups, the negative pressure surface of one of the adjacent two blades defines a tangent line at a limit near the wind inlet end, and the negative pressure surface of the other of the adjacent two blades defines another tangent line at a limit near the wind inlet end, wherein a slope of the another tangent line is greater than a slope of the tangent line.
10. The axial fan according to claim 1, wherein in each of the fan blade groups, the negative pressure surface of each of the blades defines a first tangent line at a limit near the air inlet end, and the negative pressure surface of each of the blades defines a second tangent line at a limit near the air outlet end, wherein a slope of the second tangent line is greater than a slope of the first tangent line.
11. The axial fan according to claim 1, wherein the hub rotates in a first direction about the central axis, each of the blades is bent in a second direction, and the first direction is opposite to the second direction.
12. The axial fan according to claim 11, wherein in each of the fan blade groups, from one of the adjacent two blades to the other of the adjacent two blades is aligned in the second direction.
13. The axial fan according to claim 12, wherein an area of an orthographic projection of another one of the adjacent two blades on any one plane perpendicular to the central axis is larger than an area of an orthographic projection of one of the adjacent two blades on any one plane perpendicular to the central axis.
14. The axial fan according to claim 1, wherein each of the fan blade groups includes:
the first blade is connected with the hub and is provided with a first air inlet end, a first negative pressure surface, a first air outlet end and a first positive pressure surface which are sequentially connected;
the second blade is connected with the hub and is provided with a second air inlet end, a second negative pressure surface, a second air outlet end and a second positive pressure surface which are sequentially connected; and
a third blade connected to the hub and having a third inlet end, a third negative pressure surface, a third outlet end and a third positive pressure surface connected in sequence, wherein a first minimum distance between the first inlet end and the positive pressure side is greater than a second minimum distance between the second inlet end and the positive pressure side, a second minimum distance between the second inlet end and the positive pressure side is greater than a third minimum distance between the third inlet end and the positive pressure side, a fourth minimum distance between the first outlet end and the negative pressure side is less than a fifth minimum distance between the second outlet end and the negative pressure side, and the fifth minimum distance between the second outlet end and the negative pressure side is less than a sixth minimum distance between the third outlet end and the negative pressure side, the first outlet end corresponds to the second inlet end, and the second outlet end corresponds to the third inlet end, the first negative pressure surface corresponds to the second positive pressure surface, a first gap is formed between the first negative pressure surface and the second positive pressure surface, the second negative pressure surface corresponds to the third positive pressure surface, and a second gap is formed between the second negative pressure surface and the third positive pressure surface.
15. The axial fan according to claim 14, wherein the first negative pressure surface, the second negative pressure surface, and the third negative pressure surface are relatively close to the negative pressure side, and the first positive pressure surface, the second positive pressure surface, and the third positive pressure surface are relatively close to the positive pressure side, the first minimum distance between the first air inlet end and the positive pressure side is greater than a seventh minimum distance between the first air outlet end and the positive pressure side, the second minimum distance between the second air inlet end and the positive pressure side is greater than an eighth minimum distance between the second air outlet end and the positive pressure side, and the third minimum distance between the third air inlet end and the positive pressure side is greater than a ninth minimum distance between the third air outlet end and the positive pressure side.
16. The axial fan of claim 14, wherein a central plane is defined midway between the suction side and the pressure side of the hub, the first blade is proximate the suction side, the second blade passes through the central plane, and the third blade is proximate the pressure side.
17. The axial fan according to claim 14, wherein a junction between the first air inlet end and the first negative pressure surface defines a first negative pressure point, a junction between the second air inlet end and the second negative pressure surface defines a second negative pressure point, a junction between the third air inlet end and the third negative pressure surface defines a third negative pressure point, and a junction between the third air outlet end and the third negative pressure surface defines a fourth negative pressure point, a junction between the first air inlet end and the first positive pressure surface defines a first positive pressure point, a junction between the first air outlet end and the first positive pressure surface defines a second positive pressure point, a junction between the second air outlet end and the second positive pressure surface defines a third positive pressure point, and a junction between the third air outlet end and the third positive pressure surface defines a fourth positive pressure point, wherein the first negative pressure point, the second negative pressure point, the third positive pressure point, and the fourth negative pressure point are defined, The third negative pressure point and the fourth negative pressure point define a first connecting line therebetween, the fourth negative pressure point and the fourth positive pressure point define a second connecting line therebetween, the first positive pressure point, the second positive pressure point, the third positive pressure point and the fourth positive pressure point define a third connecting line therebetween, the first negative pressure point and the first positive pressure point define a fourth connecting line therebetween, and the first connecting line, the second connecting line, the third connecting line and the fourth connecting line surround to form an airfoil shape.
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| CN112664465B CN112664465B (en) | 2022-09-13 |
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| US20150152879A1 (en) * | 2013-11-29 | 2015-06-04 | Applied Thermal/Fluid Analysis Center Limited Liability Company | Blade structure of axial fan |
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| US1779026A (en) * | 1928-04-12 | 1930-10-21 | Wragg Charles Arthur | Multiple-blade propeller |
| US4512718A (en) * | 1982-10-14 | 1985-04-23 | United Technologies Corporation | Tandem fan stage for gas turbine engines |
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|---|---|
| CN112664465B (en) | 2022-09-13 |
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