CN210118280U - High-efficiency low-noise fan blade for cooling engine - Google Patents
High-efficiency low-noise fan blade for cooling engine Download PDFInfo
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- CN210118280U CN210118280U CN201920554958.3U CN201920554958U CN210118280U CN 210118280 U CN210118280 U CN 210118280U CN 201920554958 U CN201920554958 U CN 201920554958U CN 210118280 U CN210118280 U CN 210118280U
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Abstract
The utility model discloses a high-efficiency low-noise fan blade for cooling an engine, which comprises a wind protection ring, a blade and a hub; the blades are nine blades which are distributed at unequal intervals, and the interval angles of the adjacent blades are 34-36 degrees, 39-41 degrees, 36-38 degrees, 48-50 degrees, 34-36 degrees and 43-45 degrees in sequence; each blade is of a backward-bending forward-sweeping structure, the bending angle from the blade root to the middle part of the blade is gradually increased from 0 degrees to 11-12 degrees, and the bending angle from the middle part of the blade to the blade top is gradually decreased to-9 to-10 degrees; each blade is installed in an inclined mode, and the inclined angle from the blade root to the blade top is gradually reduced from 46-48 degrees to 34-35 degrees. The utility model discloses an optimize the blade profile, show the air current flow state that has improved blade surface boundary layer, reduced energy loss, improved the stable working range of fan blade, nine blades are arranged along rotating the circumference equidistance not in addition, avoid by the energy stack of evenly arranging the production, have reduced unconventional order noise, have optimized the comfortable degree of sound.
Description
Technical Field
The utility model belongs to the technical field of the engine cooling fan, concretely relates to high efficiency low noise fan blade for engine cooling.
Background
With the development of the automobile industry year by year, the cooling fan of the engine cooling system is required to achieve the cooling effect and have the characteristics of energy conservation and noise reduction, so that the cooling fan is required to have good aerodynamic performance and external structure while meeting the noise requirement. Various designs are provided for fan structures and fan blade models, wherein the fan blade structures are basically divided into structures with and without wind protection rings, and the fan blade models are divided into radial blade models and bent blade models. The existing fan blade structure often has the problems of large flow loss, high noise and the like, and the structure is in urgent need of improvement.
SUMMERY OF THE UTILITY MODEL
To the technical problem that current fan blade flow loss is great, the noise is higher, the utility model aims to provide a have better aerodynamic performance, the engine cooling that accords with the assembly noise and the acoustic mass quality of standard requirement is with high efficiency low noise fan blade.
The high-efficiency low-noise fan blade for cooling the engine comprises a wind protection ring, a blade and a hub, wherein the blade is connected with the wind protection ring at the blade top and connected with the hub at the blade root; the method is characterized in that:
the blades are distributed along the periphery of the hub in unequal intervals, the size of an included angle formed by connecting lines of the middle points of the blade roots of the adjacent blades and the center of the hub is used as an interval angle, the blades are marked by self-turning, and the interval angles of the adjacent blades are 34-36 degrees, 39-41 degrees, 36-38 degrees, 48-50 degrees, 34-36 degrees and 43-45 degrees in sequence along the running direction;
each blade is of a backward-bending and forward-sweeping structure, the size of an included angle formed by a connecting line of the front edge of each position of the blade and the center of the hub and a connecting line of the front edge of the blade root and the center of the hub is taken as a bending angle of each position, the bending angle from the blade root to the middle part of the blade is gradually increased from 0 degrees to 11-12 degrees by taking the running direction as positive, and the bending angle from the middle part of the blade to the blade top is gradually decreased to-9 to-10 degrees;
each blade is obliquely installed, the section of each blade, which is parallel to the cylindrical surface of the hub, is taken as a radius section, the connecting line of the front edge and the rear edge of the radius section is taken as a chord length line of the radius section, and the included angle between the chord length line of the radius section of each blade and the hub surface is taken as an inclination angle; the inclination angle from the blade root to the blade top is decreased from 46-48 degrees to 34-35 degrees.
The utility model discloses a some preferred embodiments, from the beginning of the directional blade of mark, calculate along the direction of operation, adjacent blade interval angle is 35 in proper order, 40, 37, 49, 35, 44, 45.
In some preferred embodiments of the present invention, each blade has a curvature angle of 0 °, 1.58 °, 6.66 °, 9.77 °, 11.41 °, 11.37 °, 9.41 °, 6.03 °, 1.86 °, 3.34 °, or-9.51 ° in sequence from the blade root to the blade tip at 11 equally spaced radius sections.
In some preferred embodiments of the present invention, the inclination angle of each blade from the blade root to the blade tip at 11 equally spaced radius sections is 46.92 °, 44 °, 42 °, 39.92 °, 38.77 °, 37.63 °, 36.65 °, 35.94 °, 35.26 °, 34.62 °, 34.32 ° in turn.
In some preferred embodiments of the present invention, the chord length of the radius section of the equally spaced 11 radius sections from the blade root to the blade tip is 45.35mm, 43.82mm, 42.9mm, 42.26mm, 41.75mm, 41.37mm, 41.04mm, 40.77mm, 40.55mm, 40.38mm, 40.6mm in sequence.
In some preferred embodiments of the present invention, the radial cross-section of the blade is an airfoil cross-section.
In some preferred embodiments of the present invention, the hub is provided with a coupling structure.
In some preferred embodiments of the present invention, the hub has a slot on its surface. The better, the slotted hole circumference is unevenly distributed, sets up the slotted hole and does benefit to motor and incoming flow convection heat transfer, increases the stability of motor work, and the slotted hole unevenly distributed avoids the inside muscle of wheel hub, does benefit to the fan blade and moulds plastics.
In some preferred embodiments of the present invention, the front end of the wind protection ring is provided with an outward-turned flange structure along the circumferential direction. The flanging structure can block airflow at the blade top caused by the pressure difference between the suction surface and the pressure surface.
In some preferred embodiments of the present invention, the wind guard ring, the blades and the hub are of a unitary injection molding structure.
The beneficial effects of the utility model reside in that:
1. by adopting a backward-bending forward-sweeping blade structure, the backward-bending blade can enable low-energy fluid on the blade profile surface in the middle of the blade cascade to migrate to two ends compared with a radial blade, so that the energy loss in the middle is reduced; compared with the forward-bent blade, the backward-bent blade has smaller bending degree, reduces the flow loss caused by large bending angle, and has better improvement effect on the pneumatic performance; the forward sweep reduces the accumulation and migration of low-energy fluid to the blade top, improves the flow condition of the suction surface at the blade top and improves the pneumatic efficiency and the stall domain degree.
2. The design of nine blades is adopted, and the nine blades are arranged at unequal intervals along the rotating circumference, so that energy superposition generated by uniform arrangement is avoided, the unconventional order noise is reduced, and the comfort degree of sound is optimized.
3. The design of nine blades is adopted, the chord length of a single blade is reduced, the weight of the blade is lighter, the axial height of the blade is only about 26mm, the application range of the blade is greatly expanded, and the design of a wind shield and the flexibility of fan space arrangement are facilitated.
4. The design of the blade adopts delta CurnThe constant variable circulation flow pattern, the index n changes along the radius rule, optimizes the flow field, improves the efficiency and reduces the noise.
5. The blade top is additionally provided with the wind protection ring and the flanging structure, the wind protection ring structure improves the strength of the blade, avoids radial deformation of the blade caused by centrifugal force, strengthens and supports the blade, overcomes irregular shaking, and blocks airflow flowing caused by pressure difference between a suction surface and a pressure surface at the blade top by the flanging structure, thereby further improving the pneumatic efficiency and the stall domain degree and reducing noise. The vertical rotating shaft is provided with circumferentially non-uniformly distributed slotted holes on the hub surface, the slotted holes are favorable for convection heat exchange between the motor and incoming flow, the working stability of the motor is improved, the slotted holes are unevenly distributed to avoid ribs inside the hub, and the injection molding of fan blades is facilitated.
Drawings
Fig. 1 is a schematic structural view of the high-efficiency low-noise fan blade for cooling the engine of the present invention;
FIG. 2 is a partial cross-sectional view of the high efficiency low noise fan blade for cooling the engine of the present invention;
fig. 3 is a schematic view of the inclination angle and the section chord length of an 11 radius section of a blade according to the present invention.
Reference numerals
The wind protection ring comprises a wind protection ring 1, blades 2, a hub 3, a coupling structure 4 and a flanging structure 5.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
Example 1
Fig. 1 shows the utility model relates to a preferred engine cooling uses high efficiency low noise fan blade, and it is by protecting wind ring 1, blade 2 and wheel hub 3 constitution an organic whole, for whole injection moulding, blade 2 is connected with protecting wind ring 1 in the blade top department, is connected with wheel hub 3 in blade root department, has coupling structure 4 on wheel hub 3. The motor shaft is connected with the fan blades through the connecting shaft structure 4 to drive the fan blades to rotate to convey air. The front end of the wind protection ring 1 is provided with an outward turned flanging structure 5 along the circumferential direction (see figure 2).
The blades 2 are distributed along the hub at unequal intervals, the size of an included angle formed by connecting the middle point of the blade root of each adjacent blade and the center of the hub is taken as an interval angle (namely, an angle A1 shown in figure 1), and the interval angles of the adjacent blades are 35 degrees, 40 degrees, 37 degrees, 49 degrees, 35 degrees, 44 degrees and 45 degrees sequentially calculated along the running direction (clockwise) from the turning mark blade (namely, the blade 2a corresponding to the clockwise directional arrow on the hub surface in figure 1).
Each blade 2 adopts a backward-bending forward-sweeping structure and is obliquely installed. Each blade is from the blade root to the blade top, 11 radius sections 2b (including the blade root and the blade top) are taken at equal intervals, the 11 radius sections are airfoil sections as shown in fig. 3, and specific parameters at each position comprise:
blade design calculation radius: the distance of each radius cross section from the hub center; the designed and calculated radiuses of the blades at the 11 radius sections are 83.2mm, 99.8mm, 116.6mm, 133.4mm, 150.2mm, 167mm, 183.8mm, 200.6mm, 217.4mm, 234.2mm and 252.2mm in sequence;
bending angle a 2: the included angle formed by the connecting line of the front edge of each radius section and the center of the hub and the connecting line of the front edge of the blade root (namely the front edge of the No. 1 radius section) and the center of the hub is positive along the running direction, and is negative on the contrary; the bending angles a2 at the 11 radius sections are 0 °, 1.58 °, 6.66 °, 9.77 °, 11.41 °, 11.37 °, 9.41 °, 6.03 °, 1.86 °, 3.34 °, 9.51 ° in sequence;
radius section chord length L: the distance from the front edge to the rear edge of each radius section; the chord length L of the radius sections at the 11 radius sections is 45.35mm, 43.82mm, 42.9mm, 42.26mm, 41.75mm, 41.37mm, 41.04mm, 40.77mm, 40.55mm, 40.38mm and 40.6mm in sequence;
radius inclination angle a 3: the included angle between the chord length line of the radius section and the hub surface; the inclination angles at the 11 radius sections are 46.92 degrees, 44 degrees, 42 degrees, 39.92 degrees, 38.77 degrees, 37.63 degrees, 36.65 degrees, 35.94 degrees, 35.26 degrees, 34.62 degrees and 34.32 degrees in sequence. Through the control of inclination angle, can obtain stable flow field, and can operate under the highest static pressure efficiency under appointed operating mode.
The above parameter design is specifically shown in table 1 below.
TABLE 1 blade design parameters
The utility model discloses a high efficiency low noise fan blade for engine cooling has following advantage and characteristics owing to adopted above technical scheme:
1. by adopting a backward-bending forward-sweeping blade structure, the backward-bending blade can enable low-energy fluid on the blade profile surface in the middle of the blade cascade to migrate to two ends compared with a radial blade, so that the energy loss in the middle is reduced; compared with the forward-bent blade, the backward-bent blade has smaller bending degree, reduces the flow loss caused by large bending angle, and has better improvement effect on the pneumatic performance; the forward sweep reduces the accumulation and migration of low-energy fluid to the blade top, improves the flow condition of the suction surface at the blade top and improves the pneumatic efficiency and the stall domain degree.
2. The design of nine blades is adopted, and the nine blades are arranged at unequal intervals along the rotating circumference, so that energy superposition generated by uniform arrangement is avoided, the unconventional order noise is reduced, and the comfort degree of sound is optimized.
3. The design of nine blades is adopted, the chord length of a single blade is reduced, the weight of the blade is lighter, the axial height of the blade is only about 26mm, the application range of the blade is greatly expanded, and the design of a wind shield and the flexibility of fan space arrangement are facilitated.
4. The design of the blade adopts delta CurnThe constant variable circulation flow pattern, the index n changes along the radius rule, optimizes the flow field, improves the efficiency and reduces the noise.
5. The blade top is additionally provided with the wind protection ring and the flanging structure, the wind protection ring structure improves the strength of the blade, avoids radial deformation of the blade caused by centrifugal force, strengthens and supports the blade, overcomes irregular shaking, and blocks airflow flowing caused by pressure difference between a suction surface and a pressure surface at the blade top by the flanging structure, thereby further improving the pneumatic efficiency and the stall domain degree and reducing noise. The vertical rotating shaft is provided with circumferentially non-uniformly distributed slotted holes on the hub surface, the slotted holes are favorable for convection heat exchange between the motor and incoming flow, the working stability of the motor is improved, the slotted holes are unevenly distributed to avoid ribs inside the hub, and the injection molding of fan blades is facilitated.
In a word, the utility model discloses a high efficiency low noise fan blade for engine cooling through optimizing the leaf type, has improved the flow of part in the leaf, has reduced the secondary vortex loss between the leakage vortex loss of leaf top department and cascade, is showing the air current flow state who has improved blade surface boundary layer, has reduced energy loss than radial blade, has improved the stable working range of fan blade, all can maintain higher aerodynamic performance at 1600rpm ~ 3000 rpm.
While the preferred embodiments of the present invention have been described in detail, it will be understood that the invention is not limited thereto, and that various modifications and substitutions of equivalents may be made by those skilled in the art without departing from the scope of the invention as defined in the appended claims.
Claims (9)
1. A high-efficiency low-noise fan blade for cooling an engine comprises a wind protection ring, a blade and a hub, wherein the blade is connected with the wind protection ring at the blade top and connected with the hub at the blade root; the method is characterized in that:
the blades are distributed along the periphery of the hub in unequal intervals, the size of an included angle formed by connecting lines of the middle points of the blade roots of the adjacent blades and the center of the hub is used as an interval angle, the blades are marked by self-turning, and the interval angles of the adjacent blades are 34-36 degrees, 39-41 degrees, 36-38 degrees, 48-50 degrees, 34-36 degrees and 43-45 degrees in sequence along the running direction;
each blade is of a backward-bending and forward-sweeping structure, the size of an included angle formed by a connecting line of the front edge of each position of the blade and the center of the hub and a connecting line of the front edge of the blade root and the center of the hub is taken as a bending angle of each position, the bending angle from the blade root to the middle part of the blade is gradually increased from 0 degrees to 11-12 degrees by taking the running direction as positive, and the bending angle from the middle part of the blade to the blade top is gradually decreased to-9 to-10 degrees;
each blade is obliquely installed, the section of each blade, which is parallel to the cylindrical surface of the hub, is taken as a radius section, the connecting line of the front edge and the rear edge of the radius section is taken as a chord length line of the radius section, and the included angle between the chord length line of the radius section of each blade and the hub surface is taken as an inclination angle; the inclination angle from the blade root to the blade top is decreased from 46-48 degrees to 34-35 degrees.
2. The high-efficiency low-noise fan blade for cooling the engine as claimed in claim 1, wherein the bending angles of the blades at 11 equally spaced radius sections from the blade root to the blade tip are 0 °, 1.58 °, 6.66 °, 9.77 °, 11.41 °, 11.37 °, 9.41 °, 6.03 °, 1.86 °, 3.34 ° and-9.51 ° in sequence.
3. The high efficiency, low noise fan blade for engine cooling of claim 1 wherein each blade has an angle of inclination of 46.92 °, 44 °, 42 °, 39.92 °, 38.77 °, 37.63 °, 36.65 °, 35.94 °, 35.26 °, 34.62 °, 34.32 ° in sequence from the blade root to the blade tip at equally spaced 11 radius sections.
4. The high-efficiency low-noise fan blade for cooling the engine as claimed in claim 1, wherein the chord lengths of the radial sections of the 11 equally spaced radial sections of each fan blade from the blade root to the blade tip are 45.35mm, 43.82mm, 42.9mm, 42.26mm, 41.75mm, 41.37mm, 41.04mm, 40.77mm, 40.55mm, 40.38mm and 40.6mm in sequence.
5. A high efficiency, low noise fan blade for cooling an engine as defined in claim 1 wherein the radial cross section of the blade is an airfoil cross section.
6. The fan blade for cooling the engine of claim 1, wherein a coupling structure is provided on the hub.
7. The high efficiency, low noise fan blade for cooling an engine of claim 1 wherein said hub has a slot in a surface thereof.
8. The high-efficiency low-noise fan blade for cooling the engine according to claim 1, wherein the front end of the wind protection ring is provided with an outward-turned flanging structure along the circumferential direction.
9. The high efficiency, low noise fan blade for engine cooling of claim 1 wherein said shroud ring, blades and hub are of unitary injection molded construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920554958.3U CN210118280U (en) | 2019-04-23 | 2019-04-23 | High-efficiency low-noise fan blade for cooling engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920554958.3U CN210118280U (en) | 2019-04-23 | 2019-04-23 | High-efficiency low-noise fan blade for cooling engine |
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| Publication Number | Publication Date |
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| CN210118280U true CN210118280U (en) | 2020-02-28 |
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| CN201920554958.3U Active CN210118280U (en) | 2019-04-23 | 2019-04-23 | High-efficiency low-noise fan blade for cooling engine |
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- 2019-04-23 CN CN201920554958.3U patent/CN210118280U/en active Active
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