CN213331674U - Centrifugal three-dimensional flow impeller and dust collector motor - Google Patents
Centrifugal three-dimensional flow impeller and dust collector motor Download PDFInfo
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- CN213331674U CN213331674U CN202021078823.3U CN202021078823U CN213331674U CN 213331674 U CN213331674 U CN 213331674U CN 202021078823 U CN202021078823 U CN 202021078823U CN 213331674 U CN213331674 U CN 213331674U
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Abstract
The utility model discloses a centrifugal three-dimensional flow movable impeller and dust catcher motor, centrifugal three-dimensional flow movable impeller include wheel hub and a plurality of three-dimensional flow blade of a side surface integrated injection moulding, the blade leading edge inducer inboard of three-dimensional flow blade meets with wheel hub's tangent line and wheel hub's circumference normal tangent line's contained angle beta1=65 ° -75 °; ternary elementIncluded angle beta between tangent line of outermost edge of blade leading edge inlet section of flow blade and circumferential normal tangent line of hub2=28 ° -35 °. Outlet angle beta of trailing edge of three-dimensional flow blade3And (3) 20-30 degrees, wherein the number of the blades Z = 9-13. Hub meridian flow surface opening angle beta4And = 120-130 deg. The utility model discloses an integral type injection moulding, structural strength is big, has solved riveting formula structure movable impeller when exceeding 400W power, and the problem of impeller blasting under the high vacuum has improved factor of safety, and the rotational speed is high, efficient.
Description
Technical Field
The utility model relates to a motor impeller, a special design centrifugal three-dimensional flow movable impeller and dust catcher motor are used for household electrical appliances such as hand dryer and bladeless fan equally.
Background
In recent two years, due to the maturity of the BLDC new vacuum cleaner motor, the power demand for the BLDC new vacuum cleaner motor is also increased with different cleaning fields, and the motor with small volume and high power becomes a mainstream trend of the existing market. The diameter of the impeller is reduced along with the reduction of the volume of the motor, the rotating speed is increased, and the vacuum degree is also increased. However, the conventional riveting type binary-flow impeller cannot meet the requirement of structural strength under the rigid conditions of high power, high vacuum and high rotating speed without special process treatment, so that a ternary-flow impeller which can be processed and applied to a brushless motor of a dust collector through an injection molding process is developed based on the design principle of the impeller of a centrifugal compressor. Because this kind of impeller is through injection molding technology integrated into one piece or based on aviation aluminum product CNC processing, the demand to processing raw and other materials characteristic is higher, and the die sinking technology is also comparatively complicated for traditional binary stream impeller, and its die sinking cost and processing cost are more expensive.
SUMMERY OF THE UTILITY MODEL
In order to meet the requirements of the traditional riveting type binary-flow impeller under high power, high vacuum and high rotating speed, the strength of the traditional riveting type binary-flow impeller can not meet the requirements, so that an injection molding integrated three-flow impeller is developed to meet the requirements of the strength under high power, high vacuum and high rotating speed.
The technical scheme of the utility model is that:
a high-speed centrifugal three-dimensional flow movable impeller based on CFD fluid simulation and forward design comprises a hub and a plurality of three-dimensional flow blades integrally formed on one side surface of the hub, wherein the front edge inlet sections of the three-dimensional flow blades are respectively connected with a shaft hole in the center of the hub, the tail edges of the three-dimensional flow blades are respectively connected with the circumference of the hub, and the included angle beta between the tangent line of the inner side of the front edge inlet section of each three-dimensional flow blade, connected with the hub, and the circumferential normal tangent line of the hub1=65 ° -75 °; included angle beta between tangent line of outermost edge of blade leading edge inlet section of three-dimensional flow blade and circumferential normal tangent line of hub2=28°～35°。
Preferably, the outlet angle β of the trailing edge of the tertiary flow blade3=20°～30°。
Preferably, the number of the three-dimensional flow blades Z =9 to 13.
Preferably, the thinnest of the three-dimensional flow blade obtains the thickest thickness T = 0.8-0.95 mm, and the hub thickness theta = 1.2-1.6 mm.
Preferably, the surface of the hub on the side where the three-dimensional flow blades are arranged is a meridional flow surface, the linear form of the meridional flow surface is drawn by a variable spiral curve, and the opening angle β of the meridional flow surface4=120°~130°。
Preferably, the bottom of the hub is additionally provided with a circle of skirt edge which is used for being matched with a groove of a stationary impeller below a movable impeller, so that the flowing air tightness of the fan is increased, the backflow loss is reduced, the flowing efficiency of the fan is improved, the dynamic balance trimming of the whole motor is facilitated, the influence of mechanical noise is reduced, and the height H of the skirt edget=3~5mm。
Preferably, the hub and the three-dimensional flow blades are integrally formed by injection molding.
The utility model discloses still design a dust catcher motor, adopt to have above-mentioned centrifugal three-dimensional flow movable vane wheel.
The utility model has the advantages that:
the utility model discloses a centrifugal three dimensional flow movable vane is owing to adopt integral type injection moulding, and structural strength is big, has solved riveting formula structure movable vane when exceeding 450W power, and the problem of impeller blasting under the high vacuum has improved factor of safety, and the rotational speed is high, efficient, tests aerodynamic performance on its maximum external diameter size 45 mm's motor, and the rotational speed can reach more than 15WRPM, efficiency 52% under its 500W power.
Drawings
The invention will be further described with reference to the following drawings and examples:
FIG. 1 is a schematic view of the overall structure of a centrifugal three-dimensional flow impeller according to the present invention;
FIG. 2 is a front view of the centrifugal three-dimensional flow impeller of the present invention;
FIG. 3 is a top view of the centrifugal three-dimensional flow impeller of the present invention;
FIG. 4 is a cross-sectional view of the centrifugal three-dimensional flow impeller of the present invention;
FIG. 5 is a schematic view of the meridional flow surface of the centrifugal three-dimensional flow impeller of the present invention;
FIG. 6 is a meridional flow surface vector velocity plot of greater than 130 degrees;
FIG. 7 is a meridional flow surface vector velocity plot of less than 120;
FIG. 8 is a meridional flow surface vector flow velocity plot between 120 DEG and 130 DEG;
FIG. 9 is a parameter chart of meridian streamline form plotted by a variable helix.
Detailed Description
As shown in FIG. 1, the centrifugal three-dimensional flow impeller of the present invention comprises a hub 1 and a plurality of three-dimensional flow blades 2 integrally formed on a side surface of the hub, wherein a leading edge inlet section of each three-dimensional flow blade is connected with a shaft hole 3 at the center of the hub, and a trailing edge of each three-dimensional flow blade is connected with the circumference of the hub. The impeller adopts integral type injection moulding, and structural strength is big, has solved riveting formula structure movable impeller when exceeding 400W power, and the problem of impeller blasting under the high vacuum has improved factor of safety. The following is the utility model discloses a design parameter optimizes.
Impeller inlet angle, outlet angle and number of blades.
The blade leading edge inlet section of the impeller design determines the blade inlet profile through two inlet angles, namely: included angle beta between tangent line of blade leading edge inlet section inner side of three-dimensional flow blade connected with hub and circumferential normal tangent line of hub1And the included angle beta between the tangent of the outermost edge of the blade leading edge inlet section of the three-dimensional flow blade and the circumferential normal tangent of the hub2See fig. 2. The range beta of the anteversion angle of the impeller blade is verified through CFD numerical simulation calculation and actual performance test1=65°～75°、β2And the gas inlet flow efficiency is optimal at the angle of = 28-35 deg. The trailing edge of the impeller is similar to the outlet of the traditional binary flow blade, and the outlet angle beta of the impeller is observed by the change of a flow field through CFD simulation calculation3The working condition flow rate of the impeller at the time of the best pneumatic efficiency of 20-30 degrees is 0.8-0.85 m3The speed is 112000-115000 RPM between min and min. The number of impeller blades Z =9~13, beta as defined above therein1、β2、β3The diffusion loss of the impeller flow passage in the range of (2) is small, and the aerodynamic noise is small.
Blade thickness, hub thickness and impeller bottom skirt height
The impeller design starting point is mainly applied to the working performance and the safety factor under high-power high vacuum, therefore, the strength of the blade is one of the main factors considered in the design, the structural modal changes of the blade under different thicknesses are calculated through CFD numerical simulation, and compared with the modal amplitude changes of the whole impeller within the range from the thinnest to the thickest T = 0.8-0.95 mm and the wheel thickness theta = 1.2-1.6 mm, the aerodynamic efficiency influence is small, and the aerodynamic efficiency influence is shown in figure 3.
For increasing the gas tightness between the movable impeller and the stationary impeller 5, reducing the gas friction loss, improving the flow efficiency of the fan, simultaneously solving the problem of dynamic balance trimming of the fan, reducing the influence of mechanical noise, adding a circle of skirt edge 4 at the bottom of the hub of the movable impeller, and having a height HtAnd the moving impeller is 3-5 mm and is used for being matched with a groove of a stationary impeller 5 below the moving impeller, as shown in figure 4.
Radial flow surface opening angle
Factors influencing impeller efficiency in addition to the above points, numerical simulation and test show that the opening angle beta of a meridional flow surface4(see fig. 5) is also one of the important factors influencing the aerodynamic efficiency of the impeller, the opening angle has a large influence on the flow speed change in the flow passage, and the meridional flow surface opening angle is too large (more than 130 degrees), the flow speed direction of the inlet is inclined and changed, and the flow speed is too large, as can be seen from fig. 6; it is seen from FIG. 7 that the meridian flow has uneven opening angle (less than 120 deg.) inside the flow channel, which is easy to generate reflux; now, the opening angle β can be seen from the experiment shown in FIG. 84And about = 120-130 degrees, the flow rate changes uniformly.
The effect is ideal after the experiment, in order to ensure that the angle of the opening angle molded line is uniformly changed, the meridian streamline line is drawn by adopting a variable spiral line, and the expression is
r=R1*e^φ*{Bi*(φ/α)^K+tanβ},
The parameters in the formula are shown in FIG. 9: r and φ are the polar angle and radius of a point in the helix and φ = α/180 π; r1 denotes impeller inlet radius; e, natural logarithm; beta represents a blade placement angle; k is an empirical coefficient and generally takes a value of 0-1; and the meridian streamline is determined by determining three variables of R1, beta and alpha.
The centrifugal three-dimensional flow impeller of the utility model is used on the motor of a dust collector or other electrical appliances, such as a bladeless blower, a bladeless electric fan, a hand dryer and the like.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the present invention shall be covered within the protection scope of the present invention.
Claims (8)
1. A centrifugal three-dimensional flow movable vane wheel comprises a wheel hub and a plurality of three-dimensional flow vanes integrally formed on one side surface of the wheel hub, wherein the front edge inlet sections of the three-dimensional flow vanes are respectively connected with a shaft hole in the center of the wheel hub, and the tail edges of the three-dimensional flow vanes are respectively connected with the circumference of the wheel hub1=65 ° -75 °; included angle beta between tangent line of outermost edge of blade leading edge inlet section of three-dimensional flow blade and circumferential normal tangent line of hub2=28°～35°。
2. The centrifugal tertiary flow impeller of claim 1, wherein the exit angle β of the trailing edge of the tertiary flow blade3=20°～30°。
3. The centrifugal three-dimensional flow impeller according to claim 2, wherein the number of the three-dimensional flow blades is Z = 9-13.
4. The centrifugal three-dimensional flow impeller according to claim 3, wherein the thickness T = 0.8-0.95 mm from thinnest to thickest of the three-dimensional flow blades, and the hub thickness θ = 1.2-1.6 mm.
5. The centrifugal three-dimensional flow impeller according to claim 4, wherein the surface of the hub on the side where the three-dimensional flow blades are provided is a meridional flow surface, the meridional flow surface is linear and is drawn by a variable spiral curve, and the opening angle β of the meridional flow surface is4=120~130°。
6. The centrifugal three-dimensional flow impeller as claimed in claim 5, wherein a circle of skirt is added at the bottom of the hub for matching with the groove of the stationary impeller below the impeller, so as to increase the air tightness of the fan flow, reduce the return loss, improve the fan flow efficiency, facilitate the dynamic balance trimming of the whole motor, and further reduce the influence of mechanical noise, and the height H of the skirt is equal to that of the skirtt=3~5mm。
7. The centrifugal tertiary flow impeller according to any one of claims 1 to 6, wherein the hub and the tertiary flow blades are integrally injection molded.
8. A vacuum cleaner motor, characterized in that, a centrifugal three-dimensional flow impeller according to any one of claims 1 to 7 is used.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021078823.3U CN213331674U (en) | 2020-06-12 | 2020-06-12 | Centrifugal three-dimensional flow impeller and dust collector motor |
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| CN202021078823.3U CN213331674U (en) | 2020-06-12 | 2020-06-12 | Centrifugal three-dimensional flow impeller and dust collector motor |
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| CN213331674U true CN213331674U (en) | 2021-06-01 |
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| CN202021078823.3U Active CN213331674U (en) | 2020-06-12 | 2020-06-12 | Centrifugal three-dimensional flow impeller and dust collector motor |
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