CN114427543B - Bionic centrifugal wind wheel and centrifugal fan - Google Patents
Bionic centrifugal wind wheel and centrifugal fan Download PDFInfo
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- CN114427543B CN114427543B CN202210058928.XA CN202210058928A CN114427543B CN 114427543 B CN114427543 B CN 114427543B CN 202210058928 A CN202210058928 A CN 202210058928A CN 114427543 B CN114427543 B CN 114427543B
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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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
-
- 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
- F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts
-
- 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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a bionic centrifugal wind wheel and a centrifugal fan, wherein the bionic centrifugal wind wheel comprises a wheel cover, a wheel disc and a plurality of bionic blades, the bionic blades are circumferentially arranged between the wheel cover and the wheel disc, the blade profile of each bionic blade sequentially comprises a first low wing profile, a gull wing profile and a second low wing profile from the top to the root along the axial direction, the thickness of each bionic blade is reduced after being increased from the front edge to the rear edge, the maximum thickness of each bionic blade is positioned at the chord length of the bionic blade from 20% -50% of the chord length along the direction from the front edge to the rear edge, and the thicknesses of the front edges of the first low wing profile and the second low wing profile are both larger than the thickness of the front edge of each gull wing profile. The invention has the beneficial effects that: the overall structural strength of the bionic centrifugal wind wheel is improved, the situation of cracks and even breakage is avoided, the normal operation of the bionic centrifugal wind wheel is ensured, the efficiency of the bionic centrifugal wind wheel can be improved, the noise of the bionic centrifugal wind wheel is reduced, and the pneumatic performance of the bionic centrifugal wind wheel is ensured.
Description
Technical Field
The invention relates to the technical field of fans, in particular to a high-efficiency low-noise bionic centrifugal wind wheel and a centrifugal fan.
Background
The centrifugal wind wheel is characterized in that axial air inlet and radial air outlet are adopted, centrifugal force is utilized to apply work, air is enabled to improve pressure, at present, the centrifugal wind wheel is limited by the structure of the centrifugal wind wheel, when the centrifugal wind wheel operates at a high speed, the strength of the joint of the front edge of a blade and a wheel cover and the joint of the front edge of the blade and a wheel disc are weak, cracks and even fracture are easy to occur when the joint of the front edge of the blade and the wheel cover and the wheel disc operates at a high speed, normal operation of the centrifugal wind wheel is affected, at present, in order to reduce stress concentration of the two joints, the strength of the integral centrifugal wind wheel is enhanced, thicker blades are directly adopted to increase the joint area of the joint of the blade, the wheel disc and the wheel cover, but the efficiency of the centrifugal wind wheel is low, and the noise is high.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the bionic centrifugal wind wheel with high efficiency, low noise and high strength, which comprises a wheel disc, a wheel cover and a plurality of bionic blades, wherein the bionic centrifugal wind wheel with high efficiency, low noise and high strength has the advantages of improving the overall strength of the wind wheel, avoiding the conditions of cracks and even breaks, ensuring the normal operation of the bionic centrifugal wind wheel, improving the efficiency of the bionic centrifugal wind wheel, reducing the noise of the bionic centrifugal wind wheel and ensuring the aerodynamic performance of the bionic centrifugal wind wheel.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a high-efficient low noise and high strength's bionical centrifugal wind wheel, includes wheel cap, rim plate and a plurality of bionical blade, bionical blade's top with the wheel cap is connected, bionical blade root with the rim plate is connected, a plurality of bionical blade follows the circumference interval setting of rim plate, bionical blade's profile includes first wing profile, seagull wing profile and second wing profile in proper order from the top to the root along the axial, bionical blade's thickness increases earlier from the leading edge to the trailing edge and reduces afterwards, just bionical blade's thickness biggest department is located bionical blade along chord length from the leading edge to trailing edge direction 20% -50%, first wing profile with the leading edge thickness of second wing profile all is greater than the leading edge thickness of seagull wing profile.
Preferably, the thickness of the first owl wing profile and the second owl wing profile is the greatest, and the thickness of the first owl wing profile and the second owl wing profile is the greatest in chord length from the front edge to the rear edge, so that the joint area of the front edge of the blade and the wheel cover and the wheel disc is increased, the strength of the joint of the front edge of the bionic blade and the wheel cover and the wheel disc is increased, the stress concentration is reduced, the strength of the joint of the front edge of the blade and the wheel cover and the wheel disc is effectively reduced, the pressure arteries of the front edge of the first owl wing profile and the front edge of the second owl wing profile are reduced, the noise of the bionic centrifugal wind wheel is reduced, the thickness of the front edge of the blade and the joint area of the front edge of the blade and the wheel cover and the wheel disc is increased, the strength of the joint of the front edge of the bionic blade and the wheel cover and the wheel disc is increased, the stress concentration is reduced, and the equivalent stress is reduced by 9.29% of the joint of the front edge of the bionic blade and the bionic wheel cover and the wheel disc is reduced, and the equivalent stress is reduced by the 3.the equivalent stress is reduced.
Preferably, the first and second owl wing profiles have the maximum thickness, and are respectively located at a chord length of 25% of the first and second owl wing profiles along a chord length from the front edge to the rear edge, and by such an arrangement, it is found through experiments that the first and second owl wing profiles have the maximum thickness, and are respectively located at a chord length of 25% of the first and second owl wing profiles along a chord length from the front edge to the rear edge, so that the noise reduction effect of the first and second owl wing profiles is optimal.
Preferably, the maximum thickness dimension of the first owl airfoil profile and the second owl airfoil profile is W1, the chord lengths of the first owl airfoil profile and the second owl airfoil profile are L, W1 is less than or equal to 0.05×l, and by such arrangement, the portions, close to the front edge, of the first owl airfoil profile and the second owl airfoil profile are relatively rounded, so that the first owl airfoil profile and the second owl airfoil profile can be suitable for various working conditions.
Preferably, the maximum thickness of the gull airfoil profile is located at a chord length of 30% -50% of the direction from the front edge to the rear edge of the gull airfoil profile along the chord length, and by the arrangement, the gull airfoil profile has high lift in the middle of a runner of the bionic centrifugal wind wheel, and the suction surface of the gull airfoil profile can not generate flow separation and vortex, so that the efficiency of the bionic centrifugal wind wheel can be improved.
Preferably, the maximum thickness of the gull airfoil profile is located at a chord length of 40% of the gull airfoil profile along the chord length from the front edge to the rear edge, and as proved by experiments, the maximum thickness of the gull airfoil profile is located at a chord length of 40% of the gull airfoil profile along the chord length from the front edge to the rear edge, the gull airfoil profile has the best effect, and therefore the aerodynamic performance of the bionic centrifugal wind wheel can be exerted to the maximum extent.
Preferably, the leaf heights of the first owl wing-shaped leaf profile and the second owl wing-shaped leaf profile are 30% -40% of the leaf height of the bionic leaf, and the leaf height of the gull wing-shaped leaf profile is 20% -30% of the leaf height of the bionic leaf.
Preferably, the trailing edge molded line of the bionic blade is in a C shape, so that the integral structural strength of the bionic centrifugal wind wheel can be further enhanced, the deformation of the trailing edge of the bionic blade can be reduced, the pneumatic performance of the bionic centrifugal wind wheel is prevented from being influenced due to the deformation of the bionic blade when the bionic centrifugal wind wheel runs at a high speed, and the superposition of noise can be avoided due to the inconsistent radius of the outlet of the bionic blade, so that the noise is further reduced.
Preferably, the thickness of the rear edge of the bionic blade is not smaller than 2mm, and through the arrangement, the thicknesses of the rear edges of the first owl wing-shaped blade profile, the gull wing-shaped blade profile and the second owl wing-shaped blade profile are adjusted, and the thickness of the rear edge of the bionic blade is not smaller than 2mm, so that the manufacturing process requirements of the bionic centrifugal wind wheel are met.
Preferably, the tangent line of the wheel disc at the end point of the air outlet end is an outlet tangent line, the included angle between the outlet tangent line and the horizontal direction is theta, the inner diameter of the wheel disc is Dr, the outer diameter of the wheel disc is Dh, the height of the wheel disc is H, 2H/(Dh-Dr) is less than or equal to tan theta, and by the arrangement, the bionic centrifugal wind wheel is beneficial to acting efficiently in the system, and when a plurality of bionic centrifugal wind wheels work in parallel, the bionic centrifugal wind wheel slants to air outlet, and the mutual influence between adjacent bionic centrifugal wind wheels is reduced.
Preferably, the rim plate deviates from be equipped with two at least circumference strengthening ribs and a plurality of radial strengthening ribs on the diapire of rim plate, circumference strengthening rib along radial direction interval setting, radial strengthening rib along circumference interval setting, just circumference strengthening rib with radial strengthening rib interconnect, the external diameter of circumference strengthening rib is all less than the external diameter of rim plate, and is equipped with a plurality of balanced pieces on the biggest circumference strengthening rib of diameter, through setting like this, circumference strengthening rib reaches radial strengthening rib not only can effectual improvement the intensity of rim plate, but also radial strengthening rib is along with can drive the surrounding air flow when bionical centrifugal wind wheel rotates to produce the radiating effect, play the cooling effect to the motor rotor, circumference strengthening rib sets up the rim plate deviates from on the diapire of rim plate, set up promptly on the non-working face of rim plate, compare the setting is in the outside of rim plate, still improved the adjustable range of circumference strengthening rib height saves centrifugal wind wheel installation space is favorable to the reduction of customer space, and the bionical wind wheel is effective to reduce the cost of bionical wind wheel, and the bionical wind wheel is used for the reduction in the cost, and the local air current is avoided the cost is reduced, and the local noise is reduced.
Preferably, the number of the bionic blades is N1, the number of the radial reinforcing ribs is N2, N1 is less than or equal to N2 and less than or equal to 4 multiplied by N1, and the number of the circumferential reinforcing ribs is not more than 3.
Preferably, a rounded structure is arranged between the blade top of the bionic blade and the wheel cover, and a rounded structure is arranged between the blade root of the bionic blade and the wheel disc, so that on one hand, the rounded structure further enhances the strength of the joint of the bionic blade and the wheel cover and the wheel disc, weakens the deformation of the wheel disc in the cooling stage after injection molding, and on the other hand, the rounded structure can reduce peak noise generated by airflow flowing through the wheel cover, and further reduces noise, so that the sound quality of the bionic centrifugal wind wheel during operation is better.
Preferably, the radius of curvature of the fillet structure is r, the outer diameter of the bionic centrifugal wind wheel is Ds, r is more than or equal to 0.005 xDs and less than or equal to 0.035 xDs, and by the arrangement, the excessive flow passage area of the bionic centrifugal wind wheel is prevented from being occupied under the condition that the fillet structure plays a role of increasing strength, so that the efficiency of the bionic centrifugal wind wheel is prevented from being influenced; if r is less than 0.005 xDs, the fillet structure occupies a small flow passage area of the bionic centrifugal wind wheel, but the effect of increasing the strength of the fillet structure is poor; if r is more than 0.005 xDs, the fillet structure can effectively increase the structural strength of the bionic centrifugal wind wheel, but the fillet structure occupies too much flow passage area of the bionic centrifugal wind wheel, and the efficiency of the bionic centrifugal wind wheel is reduced.
Preferably, the molded line of the wheel disc is a straight line or an arc line protruding towards the flow channel, and through the arrangement, the overall height of the bionic blade is reduced, so that the strength and the rigidity of the bionic blade are improved, and deformation and even breakage caused by the height of the bionic blade are avoided.
Preferably, the cross-sectional profile of the rounded structure comprises an arc or spline curve.
The second object of the invention is to provide a centrifugal fan, which comprises a motor and the bionic centrifugal wind wheel, wherein the bottom wall of the wheel disc, which is away from the wheel cover, is provided with a plurality of copper sleeves, the copper sleeves are arranged at intervals along the circumferential direction of the wheel disc, the copper sleeves sequentially comprise an upper ring, a middle ring and a lower ring along the axial direction, the outer diameters of the upper ring and the lower ring are equal and larger than the outer diameter of the middle ring, the outer walls of the upper ring, the middle ring and the lower ring are respectively provided with a plurality of bulges which are arranged at intervals along the circumferential direction, the copper sleeves and the wheel disc are integrally formed, the motor is arranged in the wheel disc in a penetrating way, the motor is in threaded connection with the copper sleeves, the contact area of the copper sleeves and the wheel disc is increased by the bulge structure, the adhesive force between the copper sleeves and the wheel disc is enhanced, and the outer diameters of the middle ring are smaller than the outer diameters of the upper ring and the lower ring, the copper sleeves are prevented from being separated from the wheel disc, and the bonding force between the copper sleeves and the wheel disc is enhanced.
Preferably, the wheel disc is tangential to the rotor housing of the motor towards the top wall of the wheel cover, and by means of the arrangement, separation loss caused by impact and the like when air flows from the rotor housing of the motor to the top wall of the wheel disc can be effectively reduced.
Compared with the prior art, the invention has the beneficial technical effects that:
the bionic blade is formed by fitting the first-powered wing profile, the gull wing profile and the second-powered wing profile, the thickness of the bionic blade is increased from the front edge to the rear edge and then reduced, and the maximum thickness of the bionic blade is positioned at the chord length of the bionic blade along the chord length from the front edge to the rear edge by 20% -50%, so that the efficiency of the bionic centrifugal wind wheel can be improved, the noise of the bionic centrifugal wind wheel can be reduced, the aerodynamic performance of the bionic centrifugal wind wheel can be ensured, the thickness of the front edge of the first-powered wing profile and the thickness of the front edge of the second-powered wing profile are both larger than the thickness of the front edge of the gull wing profile, and the blade profile of the bionic blade can distribute more materials at the connection of the front edge of the bionic blade, the wheel cover and the wheel disc on the basis of ensuring the performance of the bionic centrifugal wind wheel, and further improve the strength of the connection of the front edge of the bionic blade, the wheel cover and the wheel cover, reduce the noise of the bionic centrifugal wind wheel, and even ensure the normal running crack of the bionic wind wheel.
Drawings
FIG. 1 is a schematic plan view of a bionic centrifugal wind wheel according to an embodiment of the invention;
FIG. 2 is an isometric view of a bionic centrifugal wind wheel according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of the embodiment of the invention shown in FIG. 1 at D-D;
FIG. 4 is a schematic cross-sectional view of a bionic blade according to an embodiment of the invention in the E-E of FIG. 1;
FIG. 5 is a schematic view of a copper sleeve according to an embodiment of the invention;
fig. 6 is a simplified schematic plan view of a centrifugal fan according to an embodiment of the invention.
Wherein, the technical characteristics that each reference sign indicates are as follows:
1. wheel cover; 2. a wheel disc; 3. bionic blades; 4. a motor; 5. circumferential reinforcing ribs; 6. radial reinforcing ribs; 7. a balancing piece; 8. A copper sleeve; 9. a rounded corner structure; 31. a first owl airfoil profile; 32. gull airfoil blade profile; 33. a second owl airfoil profile; 34. A leading edge; 35. a trailing edge; 36. a chord length; 81. a ring is arranged; 82. a middle ring; 83. a lower ring; 84. a protrusion.
Detailed Description
The present invention will be further described in detail with reference to the following examples, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent, but the scope of the present invention is not limited to the following specific examples.
Referring to fig. 1-6, the embodiment discloses a high-efficiency low-noise high-strength bionic centrifugal wind wheel, which comprises a wheel cover 1, a wheel disc 2 and a plurality of bionic blades 3, wherein the blade tops of the bionic blades 3 are connected with the wheel cover 1, the blade roots of the bionic blades 3 are connected with the wheel disc 2, the bionic blades 3 are circumferentially arranged at intervals along the wheel disc 2, the blade shapes of the bionic blades 3 sequentially comprise a first wing-shaped blade shape 31, a gull wing-shaped blade shape 32 and a second wing-shaped blade shape 33 from the blade tops to the blade roots along the axial direction, the pressure surface line bending of the front edges of the first wing-shaped blade shape 31 and the second wing-shaped blade shape 33 is relatively smooth; the pressure surface molded line in the middle of the gull airfoil blade profile 32 is relatively smooth, the pressure surface molded lines of the front edge and the rear edge are relatively smooth, the thickness of the bionic blade 3 is firstly increased and then reduced from the front edge 34 to the rear edge 35, the maximum thickness of the bionic blade 3 is positioned at the chord length 36 of 20% -50% of the direction of the bionic blade 3 from the front edge 34 to the rear edge 35 along the chord length 36, the chord length 36 of the bionic blade 3 refers to a straight line formed by connecting the front edge 34 and the rear edge 35 of the bionic blade 3, and the thicknesses of the front edges 34 of the first owl airfoil blade profile 31 and the second owl airfoil blade profile 33 are larger than the thicknesses of the front edges 34 of the gull airfoil blade profile 32.
According to the bionic blade 3 disclosed by the invention, the bionic blade 3 is formed by fitting the first gull wing blade profile 31, the gull wing blade profile 32 and the second gull wing blade profile 33, the thickness of the bionic blade 3 is firstly increased and then reduced from the front edge 34 to the rear edge 35, the maximum thickness of the bionic blade 3 is positioned at the chord length 36 of 20% -50% of the direction from the front edge 34 to the rear edge 35 of the bionic blade 3 along the chord length 36, the efficiency of the bionic centrifugal wind wheel can be improved, the noise of the bionic centrifugal wind wheel can be reduced, the aerodynamic performance of the bionic centrifugal wind wheel can be ensured, the thicknesses of the front edges 34 of the first and second gull wing blade profiles 31 and 33 are both larger than those of the front edges 34 of the gull wing blade profile 32, and the blade profile of the bionic blade 3 can distribute more materials at the connection positions of the front edges 34 of the bionic blade 3 and the wheel cover 1 and the wheel cover 2 on the basis of guaranteeing the performance of the bionic centrifugal wind wheel, so that the bionic stress of the bionic wind wheel cover 1 and the bionic wind wheel cover 2 can be improved, and the normal running strength of the bionic wind wheel is even reduced, and the normal running strength of the bionic wind wheel is avoided.
Further, the first owl airfoil profile 31 and the second owl airfoil profile 33 have the greatest thickness, are respectively located at the chord length 36 of the first owl airfoil profile 31 and the second owl airfoil profile 33 from the front edge 34 to the rear edge 35, and are located at the positions near the wheel cover 1 and the wheel disc 2, the first owl airfoil profile 31 and the second owl airfoil profile 33 can effectively reduce the generation and development of vortex in the flow channel, and reduce the pressure arteries of the front edge 34 of the first owl airfoil profile 31 and the second owl airfoil profile 33, so that the noise of the centrifugal wind wheel can be reduced, and the thickness of the first owl airfoil profile 31 and the second owl airfoil profile 33 is thicker near the front edge 34, namely, the joint area of the front edge 34 of the bionic blade 3 and the wheel disc 2 is increased, the joint area of the front edge 34 of the bionic blade 3 and the wheel cover 1 and the wheel disc 2 is increased, the stress of the bionic blade 3 and the bionic blade 2 are reduced, the stress concentration of the bionic blade 3 and the bionic blade 2 is reduced, and the stress concentration of the bionic blade surface is reduced, and the equivalent stress is reduced from the bionic blade surface 3 and the surface 2, and the equivalent stress is reduced, and the stress of the bionic blade surface is shown by the table 2, and the stress is reduced, and the stress is shown by the stress surface table and the stress surface and the surface table is the surface table and the equivalent to be the stress.
TABLE 1 stress test data sheet for blade leading edge and shroud and disk
| Stress between the leading edge of the blade and the shroud | Stress between the leading edge of the blade and the disk | |
| Conventional blade | 157MPa | 109MPa |
| Bionic blade | 121MPa | 77MPa |
| Stress amplitude reduction | 22.90％ | 29.30％ |
Specifically, the first owl airfoil profile 31 and the second owl airfoil profile 33 have the greatest thickness, and are respectively located at a chord length 36 of 25% of the first owl airfoil profile 31 and the second owl airfoil profile 33 along a chord length 36 from a front edge 34 to a rear edge 35, and experiments show that the first owl airfoil profile 31 and the second owl airfoil profile 33 have the greatest thickness and are disposed at a chord length 36 of 25% of the first owl airfoil profile 31 and the second owl airfoil profile 33 along a chord length 36 from the front edge 34 to the rear edge 35, so that the noise reduction effect of the first owl airfoil profile 31 and the second owl airfoil profile 33 is optimal.
Further, the maximum thickness dimension of the first owl airfoil profile 31 and the second owl airfoil profile 33 is W1, the chord lengths 36 of the first owl airfoil profile 31 and the second owl airfoil profile 33 are L, W1 is 0.05×l or less and 0.1×l or less, and the portions of the first owl airfoil profile 31 and the second owl airfoil profile 33 close to the front edge 34 are relatively rounded, which can be applied to various working conditions.
Further, the maximum thickness of the gull airfoil profile 32 is located at the chord length 36 of 30% -50% of the direction from the front edge 34 to the rear edge 35 of the gull airfoil profile 32 along the chord length 36, and the gull airfoil profile 32 has high lift force in the middle of the flow channel of the bionic centrifugal wind wheel, and the suction surface of the gull airfoil profile 32 can not generate flow separation and vortex, so that the bionic centrifugal wind wheel efficiency can be improved, and the requirement of the middle part of the bionic blade 3 in the axial direction on strength is not high, and the thickness of the gull airfoil profile 32 close to the middle part and deviated to the front edge 34 is thinner than that of the first and second low airfoil profiles 31 and 33, so that the aerodynamic performance of the bionic centrifugal wind wheel can be kept at a higher level.
Specifically, the maximum thickness of the gull airfoil profile 32 is located at a chord length 36 of 40% of the gull airfoil profile 32 along a chord length 36 from the front edge 34 to the rear edge 35, and experiments prove that when the maximum thickness of the gull airfoil profile 32 is located at the chord length 36 of 40% of the gull airfoil profile 32 along the chord length 36 from the front edge 34 to the rear edge 35, the gull airfoil profile 32 has the best effect, so that the aerodynamic performance of the bionic centrifugal wind wheel can be exerted to the maximum extent.
Further, the leaf heights of the first owl wing-shaped leaf profile 31 and the second owl wing-shaped leaf profile 33 are respectively 30% -40% of the leaf height of the bionic blade 3, and the leaf height of the gull wing-shaped leaf profile 32 is 20% -30% of the leaf height of the bionic blade 3.
Further, the trailing edge 35 molded line of the bionic blade 3 is in a C shape, so that the overall structural strength of the bionic centrifugal wind wheel can be further enhanced, the deformation of the trailing edge 35 of the bionic blade 3 can be reduced, the pneumatic performance of the bionic centrifugal wind wheel is prevented from being influenced due to the deformation of the bionic blade 3 when the bionic centrifugal wind wheel runs at a high speed, and the superposition of noise can be avoided due to the inconsistent radius of the outlet of the bionic blade 3, so that the noise is further reduced.
Further, the thickness of the trailing edge 35 of the bionic blade 3 is not less than 2mm, the thicknesses of the trailing edge 35 of the first low-power wing profile 31, the gull wing profile 32 and the second low-power wing profile 33 are adjusted, and the thickness of the trailing edge 35 of the bionic blade 3 is not less than 2mm, so that the manufacturing process requirement of the bionic centrifugal wind wheel is met.
Further, the tangent line that rim plate 2 is located the air-out end extreme point is export tangent line, rim plate 1 deviates from the one end of rim plate 2 is the air inlet end, rim plate 1 with interval between the rim plate 2 outside is the air-out end, export tangent line is theta with the contained angle of horizontal direction, rim plate 1's external diameter is Ds, rim plate 2's internal diameter is Dr, rim plate 2's external diameter is Dh, rim plate 2's height is H, dh is less than or equal to Ds, 2H/(Dh-Dr) is less than or equal to tan theta, is favorable to the high-efficient acting of bionic centrifugal wind wheel in the system, and conventional centrifugal wind wheel air current level flows out, receives the hindrance influence of system wall surface, compares single fan wind tunnel test result, and test amount of wind reduces 10%, efficiency reduction 12%, and this embodiment slant air-out compares conventional centrifugal wind wheel amount of wind at least increases by 3%, efficiency is at least 4%, and a plurality of bionic centrifugal wind wheels are in the same system during the bionic parallel operation, reduce adjacent the mutual influence between the bionic centrifugal wind wheel.
Further, the molded line of the wheel disc 2 is a straight line or an arc line protruding towards the flow channel, so that the overall height of the bionic blade 3 is reduced, the strength and rigidity of the bionic blade 3 are improved, and deformation and even breakage caused by overlarge blade height of the bionic blade 3 are avoided.
Further, be equipped with two at least circumference strengthening ribs 5 and a plurality of radial strengthening rib 6 on the diapire of rim 2 deviating from rim 1, circumference strengthening rib 5 is along radial direction interval setting, radial strengthening rib 6 is along circumference interval setting, just circumference strengthening rib 5 with radial strengthening rib 6 interconnect, the external diameter of circumference strengthening rib 5 is all less than the external diameter of rim 2, and be equipped with a plurality of balancing piece 7 on the biggest circumference strengthening rib 5 of diameter, circumference strengthening rib 5 reaches radial strengthening rib 6 not only can effectual improvement rim 2's intensity, moreover radial strengthening rib 6 can drive the ambient air current and flow when bionical centrifugal wind wheel rotates to produce the radiating effect, play the cooling effect to motor 4 rotor, circumference strengthening rib 5 sets up rim 2 deviates from on rim 1's the diapire, set up promptly on rim 2's the non-working face, compare the setting and be in rim 2's the outside, still improved circumference strengthening rib 5 highly can adjust the scope, bionical air current and install the air current, bionical air current is effective to the cost is reduced, and the cost is saved to the fan is effective, the cost is reduced, the bionical air current is effectively reduced to the cost of the fan is saved, and the cost of bionical air is reduced.
Further, the number of the bionic blades 3 is N1, the number of the radial reinforcing ribs 6 is N2, N1 is less than or equal to N2 and less than or equal to 4×N1, and the number of the circumferential reinforcing ribs 5 is not more than 3, so that the production materials of the radial reinforcing ribs 6 and the circumferential reinforcing ribs 5 are reduced and the production cost is reduced under the conditions of ensuring the foundation of effectively reinforcing the structural strength of the wheel disc 2 and meeting the heat dissipation.
Further, be equipped with fillet structure 9 between the top of the leaf of bionic blade 3 with wheel cover 1, the blade root of bionic blade 3 with be equipped with fillet structure 9 between rim plate 2, on the one hand, fillet structure 9 further strengthen bionic blade 3 with wheel cover 1 reaches the intensity of rim plate 2 junction weakens rim plate 2 is the deformation of cooling stage after moulding plastics, on the other hand, fillet structure 9 can reduce the air current and flow through the peak noise that this produced, further noise reduction for tone quality when bionical centrifugal wind wheel is operated is better.
Specifically, the radius of curvature of the fillet structure 9 is r, the outer diameter of the bionic centrifugal wind wheel is Ds, r is more than or equal to 0.005×Ds and less than or equal to 0.035×Ds, and under the condition that the fillet structure 9 plays a role in increasing strength, the excessive flow passage area of the bionic centrifugal wind wheel is prevented from being occupied, so that the effect on the efficiency of the bionic centrifugal wind wheel is prevented; if r is less than 0.005 xds, the fillet structure 9 occupies a small flow area of the bionic centrifugal wind wheel, but the effect of increasing the strength of the fillet structure 9 is poor; if r is greater than 0.005 xds, although the fillet structure 9 can effectively increase the structural strength of the bionic centrifugal wind wheel, the fillet structure 9 occupies too much flow passage area of the bionic centrifugal wind wheel, and reduces the efficiency of the bionic centrifugal wind wheel.
Further, the cross-sectional profile of the rounded structure 9 includes an arc or spline curve.
The embodiment also discloses a centrifugal fan, including motor 4 and foretell bionical centrifugal wind wheel, rim plate 2 deviates from be equipped with a plurality of copper jackets 8 on the diapire of rim plate 1, a plurality of copper jackets 8 are followed rim plate 2's circumference interval sets up, copper jacket 8 includes ring 81, zhong 82 and lower ring 83 along the axial in proper order, go up ring 81 with the external diameter of lower ring 83 equals and is greater than the external diameter of zhong 82, copper jacket 8 forms "king" word structure, go up ring 81 zhong 82 with the outer wall of lower ring 83 all is equipped with a plurality of protruding 84 that set up along the circumference interval, copper jacket 8 with rim plate 2 integrated into one piece injection moulding, motor 4 wears to locate in rim plate 2, motor 4 with copper jacket 8 threaded connection, protruding 84 structure increases copper jacket 8 with rim plate 2's area of contact, the reinforcing copper jacket 8 with rim plate 2's adhesive force to the external diameter of zhong 82 is less than on the outer diameter of zhong 82 and the copper jacket 83 with rim plate 2 is avoided leaving from the external diameter of ring 81 down 8.
Further, the top wall of the wheel disc 2 facing the wheel cover 1 is tangent to the rotor housing of the motor 4, so that separation loss caused by impact and the like when air flows from the rotor housing of the motor 4 to the top wall of the wheel disc 2 can be effectively reduced.
Variations and modifications to the above would be obvious to persons skilled in the art to which the invention pertains from the foregoing description and teachings. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not constitute any limitation on the invention.
Claims (7)
1. The utility model provides a high-efficient low noise and high strength's bionical centrifugal wind wheel, includes wheel cover (1), rim plate (2) and a plurality of bionical blade (3), bionical blade (3) the leaf top with wheel cover (1) is connected, bionical blade (3) blade root with rim plate (2) are connected, a plurality of bionical blade (3) are along the circumference interval setting of rim plate (2);
the bionic blade (3) is characterized in that the blade profile of the bionic blade (3) sequentially comprises a first low wing profile (31), a gull wing profile (32) and a second low wing profile (33) from the blade top to the blade root along the axial direction, the thickness of the bionic blade (3) is increased from a front edge (34) to a rear edge (35) and then is reduced, and the thicknesses of the front edges (34) of the first low wing profile (31) and the second low wing profile (33) are both larger than the thickness of the front edge (34) of the gull wing profile (32);
the first owl airfoil profile (31) and the second owl airfoil profile (33) have the greatest thickness and are respectively positioned at a chord length (36) of 20-30% of the first owl airfoil profile (31) and the second owl airfoil profile (33) along the chord length (36) from the front edge (34) to the rear edge (35);
the maximum thickness of the gull airfoil profile (32) is positioned at a chord length (36) of 30% -50% of the gull airfoil profile (32) along the chord length (36) from the front edge (34) to the rear edge (35);
the tangent line of the wheel disc (2) at the end point of the air outlet end is an outlet tangent line, and the included angle between the outlet tangent line and the horizontal direction isThe inner diameter of the wheel disc (2) is Dr, the outer diameter of the wheel disc (2) is Dh, the height of the wheel disc (2) is H, and 2H/(Dh-Dr)/(d)>。
2. Bionic centrifugal wind wheel according to claim 1, wherein the trailing edge (35) profile of the bionic blade (3) is "C" shaped.
3. Bionic centrifugal wind wheel according to claim 1, wherein the thickness of the trailing edge (35) of the bionic blade (3) is not less than 2mm.
4. A bionic centrifugal wind wheel according to any one of claims 1-3, wherein the wheel disc (2) is provided with at least two circumferential reinforcing ribs (5) and a plurality of radial reinforcing ribs (6) on the bottom wall deviating from the wheel cover (1), the circumferential reinforcing ribs (5) are arranged at intervals along the radial direction, the radial reinforcing ribs (6) are arranged at intervals along the circumferential direction, the circumferential reinforcing ribs (5) are connected with the radial reinforcing ribs (6), the outer diameters of the circumferential reinforcing ribs (5) are smaller than the outer diameters of the wheel disc (2), and a plurality of balancing pieces (7) are arranged on the circumferential reinforcing rib (5) with the largest diameter.
5. A bionic centrifugal wind wheel according to any one of claims 1-3, wherein a fillet structure (9) is arranged between the top of the bionic blade (3) and the shroud (1), and a fillet structure (9) is arranged between the blade root of the bionic blade (3) and the wheel disc (2).
6. A centrifugal fan is characterized by comprising a motor (4) and the bionic centrifugal wind wheel as claimed in any one of claims 1-5, wherein a plurality of copper sleeves (8) are arranged on the bottom wall of a wheel disc (2) deviating from a wheel cover (1), the copper sleeves (8) are arranged at intervals along the circumferential direction of the wheel disc (2), the copper sleeves (8) sequentially comprise an upper ring (81), a middle ring (82) and a lower ring (83) along the axial direction, the outer diameter of the upper ring (81) and the outer diameter of the lower ring (83) are equal to and larger than the outer diameter of the middle ring (82), the upper ring (81), the middle ring (82) and the outer wall of the lower ring (83) are provided with a plurality of bulges (84) which are arranged at intervals along the circumferential direction, the copper bush (8) and the wheel disc (2) are integrally formed, the motor (4) is arranged in the wheel disc (2) in a penetrating mode, and the motor (4) is in threaded connection with the copper bush (8).
7. Centrifugal fan according to claim 6, wherein the wheel disc (2) is tangential to the rotor housing of the motor (4) towards the top wall of the shroud (1).
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| CN114434726B (en) * | 2022-01-17 | 2024-04-30 | 泛仕达机电股份有限公司 | Bionic molding die, integral injection molding method and bionic centrifugal wind wheel |
| CN117307511B (en) * | 2023-11-30 | 2024-03-01 | 泛仕达机电股份有限公司 | Ventilator and installation method |
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| CN101363450A (en) * | 2008-09-02 | 2009-02-11 | 西安交通大学 | Blade wheel structure of multiple wing type centrifugal blower fan |
| CN205173054U (en) * | 2015-10-15 | 2016-04-20 | 珠海格力电器股份有限公司 | Centrifugation fan blade and centrifugal fan |
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