Novel high-speed high-pressure blower motor and impeller thereof

Abstract

The utility model discloses a novel high-speed high-pressure blower's motor and impeller, including central shaft and motor, the upper side of central shaft is fixedly equipped with the impeller hub, the outside of impeller hub is fixedly equipped with a plurality of fan blades, the leading edge and trailing edge of impeller hub both adopt the linear type, and the impeller hub is equipped with the motor. A blade surface formed by a blade top arc line and a blade root arc line of the fan blade is a first blade surface, the first blade surface adopts straight transition, a fan cover is arranged on the outer side of the fan blade, the distance between a point on the blade top arc surface and the bottom of the impeller hub conforms to a logarithmic function y (A) = a-b * ln (r), a is 0-0.5 mm, a is a gap between the fan blade and the inner wall of the fan cover of the blower, and r is 0-0.5 mm. R is the distance between a point on the blade top cambered surface and the center shaft, and the impeller hub curve is a Bezier curve. By means of the mode, the fan blade can not be limited by the size of the iron core of the center shaft, the air volume and the air pressure can be continuously improved through the rotating speed, and the fan blade efficiency can be improved by improving the smoothness of a fan blade runner.

Description

Technical Field

[0001] This utility model relates to the field of hair dryer technology, specifically a motor and impeller for a novel high-speed, high-pressure hair dryer. Background Technology

[0002] High-speed hair dryers are a new type of hair dryer. They rely on a motor to provide powerful energy, with a rotation speed that can typically reach over 100,000 revolutions per minute. The motor drives the rotor to rotate the fan blades. When the fan blades rotate, air is drawn in through the air inlet, and the resulting airflow is blown out through the nozzle. This generates a high-speed, powerful airflow that quickly removes moisture from the hair, achieving the purpose of drying it, unlike traditional hair dryers which rely on high temperatures to dry the hair. Therefore, the fan blades are particularly important.

[0003] Chinese patent CN214711022U discloses a hair dryer blade, including a central shaft, an impeller hub surrounding the central shaft, and fan blades outside the impeller hub. One side of each fan blade has an outlet section, and the other side has an inlet section. The inlet and outlet sections are parallel in their top-view direction. There are six sets of fan blades. The cross-sections of the inlet and outlet sections are parabolic, higher in the middle and lower at both ends. The extended line of the inlet section in its top-view direction intersects the impeller hub at point C. Point C is connected to the central axis by line B, which forms an angle β with the extended line of the inlet section in its top-view direction. This design, with the inlet and outlet sections of the fan blades being parallel in their top-view direction and their cross-sections being parabolic, significantly improves the overall blowing performance of the hair dryer.

[0004] However, the technical solution of this patent has the following problems:

[0005] 1. This patent uses a design where the air inlet and outlet sections of the fan blades are parallel when viewed from above, and the cross-sections of the air inlet and outlet sections are parabolic to improve the overall blowing performance. However, when blowing at high speed, the flow cross-sectional area is limited by the size of the central shaft core, making it impossible to increase the rotation speed to continuously increase the air volume.

[0006] Therefore, those skilled in the art have provided a novel high-speed high-pressure blower motor and its impeller to solve the above-mentioned problems. Utility Model Content

[0007] The purpose of this invention is to provide a novel high-speed high-pressure blower motor and its impeller to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A novel high-speed high-pressure blower motor and its impeller include a central shaft and a motor. The central shaft is the rotating shaft of the impeller. An impeller hub is fixedly installed on the upper side of the central shaft. Multiple fan blades are fixedly installed on the outer side of the impeller hub. The leading edge and trailing edge of the impeller hub are both straight.

[0010] Furthermore, the blade surface formed by the tip arc and the root arc of the fan blade is the first blade surface. The first blade surface adopts a straight transition, which is convenient for 5-axis CNC machining and improves machining efficiency.

[0011] Furthermore, a wind shield is provided on the outer side of the fan blade, and the distance between the point on the arc surface of the blade tip and the bottom of the impeller hub conforms to the logarithmic function y(A)=ab*ln(r), where a takes the value 0-0.5mm, a is the gap between the fan blade and the inner wall of the wind shield of the blower, and r is the distance between the point on the arc surface of the blade tip and the rotation axis.

[0012] Furthermore, the impeller hub curve adopts a Bezier curve, and the angle α between the impeller hub curve and the horizontal plane is (30-60°).

[0013] Furthermore, the angle β between the arc of the blade tip and the horizontal plane is taken as (20-50°);

[0014] Furthermore, the first leaf surface is a curved surface, and the first leaf surface forms an angle δ with the vertical plane. The angle δ between the first leaf surface and the vertical plane is variable, gradually decreasing from the front edge to the tail edge of the first leaf surface, and takes a value of (80-10°).

[0015] Furthermore, the impeller's inlet diameter D1 is the diameter of the largest circle formed by its leading edge around the axis, the impeller's outlet diameter D2 is the diameter of the largest circle formed by its trailing edge around the axis, and the shroud's outlet diameter D3 is the diameter of its largest air outlet cross section; the ratio of D1 to D2 is in the range of (0.4-0.75), and the ratio of D2 to D3 is in the range of (0.7-0.9), resulting in a smoother fan blade flow channel, higher energy conversion, and better performance;

[0016] Furthermore, the outlet area of ​​the fan blade is larger than the inlet area, S2 / S1>1 (S1 fan blade inlet area, S2 fan blade outlet area). The larger the S2 / S1 ratio, the greater the air volume output by the fan blade. The smaller the S2 / S1 ratio (closer to 1), the higher the vacuum degree formed by the fan blade.

[0017] Furthermore, the leading edge arc surface of the fan blades is all below the upper end surface of the impeller hub, which facilitates installation and positioning. Along the axial direction, the tip of the leading edge of the fan blade is slightly higher than the root of the blade. The arc line of the leading edge of the fan blade forms an angle θ1 with the impeller rotation axis, which takes a value of (70-90°). In some cases, θ1 can also take a value of 90°, which can reduce the impeller load and improve the impeller's work capacity.

[0018] Furthermore, the wrap angle ω1 at the root of the impeller blade is within a first preset range, and the wrap angle ω2 at the tip of the blade is within a second preset range, 60°≤ω2<ω1≤90°;

[0019] Furthermore, the trailing edge arc of the fan blade forms an angle θ2 with the impeller rotation axis, the value of which is (20-60°);

[0020] Furthermore, the motor adopts a two-stage pressure boosting guide vane design, and the motor rotor adopts a single-pivot structure, which is simple to assemble, suitable for high-speed or ultra-high-speed operation, and safe and reliable. The lower side of the central shaft is fixedly installed on the output shaft of the motor, and the upper side of the motor is fixedly installed with a fan cover.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model has a reasonable ratio range between the impeller hub inlet diameter D1, outlet diameter D2, and blower outlet section diameter D3, with D1 / D2 ranging from 0.4 to 0.75 and D2 / D3 ranging from 0.7 to 0.9. This makes the fan blade flow channel smoother and the energy conversion higher. The gap fit between the fan blade and the inner wall of the blower shroud, with the gap a ranging from 0 to 0.5 mm, can avoid airflow leakage loss, improve the work capacity of the high-speed blower motor, achieve high speed and high pressure in the blower, and at the same time reduce airflow noise.

[0022] 2. By adopting a two-stage pressure boosting guide vane design for the motor, the circumferential (radial) kinetic energy of the high-speed airflow thrown out by the fan blades can be converted into axial static pressure, thereby improving the pressure resistance and work capacity of the high-speed blower motor, thus realizing the airflow delivery capacity under high or ultra-high wind pressure conditions. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a front view of the present utility model;

[0025] Figure 3 This is a schematic diagram of the impeller structure of this utility model. Figure 1 ;

[0026] Figure 4 This is a schematic diagram of the impeller structure of this utility model. Figure 2 ;

[0027] Figure 5 This is a schematic diagram of the impeller structure of this utility model. Figure 3 ;

[0028] Figure 6 This is a top view of the impeller of this utility model;

[0029] Figure 7 for Figure 5 Cross-sectional view of AA in the middle;

[0030] Figure 8 This is a schematic cross-sectional view of the impeller of this utility model. Figure 1 ;

[0031] Figure 9 This is a schematic diagram of the impeller structure of this utility model. Figure 4 ;

[0032] Figure 10 This is a schematic cross-sectional view of the impeller of this utility model. Figure 2 .

[0033] In the diagram: 1. Central shaft; 2. Impeller hub; 3. Fan blade; 4. Motor; 5. Fan cover; 6. Blade tip arc surface. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0036] In some embodiments, please refer to the accompanying drawings. Figures 1-10 A novel high-speed high-pressure blower motor and its impeller, comprising a central shaft 1 and a motor 4, wherein the central shaft 1 is the rotating shaft of the impeller, an impeller hub 2 is fixedly mounted on the upper side of the central shaft 1, and multiple fan blades 3 are fixedly mounted on the outer side of the impeller hub 2, wherein the leading edge and trailing edge of the impeller hub 2 are both straight, and the blade surface formed by the tip arc and the root arc of the fan blade 3 is the first blade surface, which adopts a flat transition, facilitating 5-axis CNC machining and improving machining efficiency.

[0037] A wind cover 5 is provided on the outer side of the fan blade 3. The distance between the point on the blade tip arc surface 6 and the bottom of the impeller hub 2 conforms to the logarithmic function y(A)=ab*ln(r), where a takes the value 0-0.5mm, a is the gap between the fan blade 3 and the inner wall of the wind cover 5 of the blower, and r is the distance between the point on the blade tip arc surface 6 and the central axis 1.

[0038] The gap between the fan blades and the inner wall of the blower's shroud 5 prevents airflow leakage and loss, enhances the working power of the high-speed blower motor 4, enables the blower to operate at high speed and high pressure, and also reduces airflow noise.

[0039] The impeller hub 2 curve adopts a Bézier curve, and the angle α between the impeller hub 2 curve and the horizontal plane is (30-60°).

[0040] The angle β between the tip arc of the three fan blades and the horizontal plane is 20-50°.

[0041] The first leaf surface is a curved surface, and the first leaf surface forms an angle δ with the vertical plane. The angle δ between the first leaf surface and the vertical plane is variable, gradually decreasing from the leading edge to the trailing edge of the first leaf surface, and takes a value of (80-10°).

[0042] This allows the fan blades 3 and impeller hub 2 to work together without being limited by the size of the iron core of the central shaft 1, and the air volume can be continuously increased by the rotation speed.

[0043] The inlet diameter D1 of the impeller is the diameter of the largest circle formed by its leading edge around the axis, the outlet diameter D2 of the impeller is the diameter of the largest circle formed by its trailing edge around the axis, and the outlet diameter D3 of the shroud 5 is the diameter of its largest air outlet cross section. The ratio of D1 to D2 is in the range of (0.4-0.75), and the ratio of D2 to D3 is in the range of (0.7-0.9), which makes the flow channel of the fan blade 3 smoother, the energy conversion higher, and the performance better.

[0044] The outlet area of ​​the fan blade 3 is greater than the inlet area, S2 / S1>1 (S1 is the inlet area of ​​fan blade 3, S2 is the outlet area of ​​fan blade 3). The larger the S2 / S1 ratio, the greater the air volume output by the fan blade 3. The smaller the S2 / S1 ratio (closer to 1), the higher the vacuum degree formed by the fan blade 3.

[0045] The leading edge arc surface of the fan blade 3 is below the upper end surface of the impeller hub 2, which facilitates installation and positioning. Along the axial direction, the tip of the leading edge of the fan blade 3 is slightly higher than the root of the blade. The leading edge arc of the fan blade 3 forms an angle θ1 with the impeller rotation axis, which is (70-90°). In some cases, θ can also be 90°, which can reduce the impeller load and improve the impeller's work capacity.

[0046] The wrap angle ω1 at the root of the impeller blade is within a first preset range, and the wrap angle ω2 at the tip of the blade is within a second preset range, where 60°≤ω2<ω1≤90°.

[0047] The trailing edge arc of the fan blade 3 forms an angle θ2 with the impeller rotation axis, which has a value of (20-60°).

[0048] In some embodiments, such as Figures 1-10 In a preferred embodiment of this utility model, the motor 4 adopts a two-stage pressure boosting guide vane design, the motor rotor of the motor 4 adopts a single-pivot structure, which is simple to assemble, suitable for high-speed or ultra-high-speed operation, and safe and reliable. The lower side of the central shaft 1 is fixedly installed on the output shaft of the motor 4, and the upper side of the motor 4 is fixedly installed with a fan cover 5.

[0049] The two-stage pressure boosting guide vane design can convert the excess circumferential (radial) kinetic energy of the high-speed airflow thrown out by the fan blade 3 into axial static pressure, thereby improving the pressure resistance and work capacity of the motor 4, thus realizing the airflow delivery capacity under high or ultra-high wind pressure conditions.

[0050] The logarithmic function y(A) = ab * ln(r) is monotonically increasing. When the coefficient b > 0, -bln(r) is monotonically decreasing, and y(A) = ab * ln(r) is monotonically decreasing; when b < 0, -bln(r) is monotonically increasing, and y(A) = ab * ln(r) is monotonically increasing. According to the actual physical model of the fan blade, if y(A) needs to decrease as r increases, then b > 0; conversely, if y(A) needs to increase as r increases, then b < 0. Typically, in the meridional model of the fan blade, it might be desirable for the distance y(A) between a point on the blade tip arc and the impeller bottom to decrease as r increases, so b > 0 is generally expected.

[0051] The range of this logarithmic function is restricted as follows: since a∈(0,0.5mm), and r is the distance between a point on the blade tip arc and the axis of rotation, its range is also limited. Let r∈[r min ,r max To ensure that the value of y(A) conforms to the actual size and structural requirements of the fan blade, the value of b must be within a reasonable range. For example, when r = r min When y(A) cannot exceed the maximum value allowed by the internal structure of the hair dryer; when r = r max When y(A) is less than the minimum safe distance from the bottom of the impeller to other components, etc.

[0052] Based on physical principles and actual operating conditions, from an aerodynamic perspective, if we want the fan blades to more effectively drive airflow, resulting in more concentrated and faster winds, it may be necessary for (A) to change according to certain rules, thus requiring a specific value for b. For example, if we want to create a specific airflow velocity distribution at the blade tip, we may need to adjust b to make y(A) satisfy the corresponding aerodynamic equations.

[0053] In typical hair dryer blade design, the value of b generally ranges from 0.5 to 3. However, in actual design, detailed computational fluid dynamics analysis and experimental testing are needed to accurately determine the value of b.

[0054] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An impeller for a novel high-speed high-pressure blower, comprising a central shaft (1), wherein the central shaft (1) is the rotating shaft of the impeller, characterized in that, An impeller hub (2) is fixedly installed on the upper side of the central shaft (1), and multiple fan blades (3) are fixedly installed on the outer side of the impeller hub (2). The leading edge and trailing edge of the impeller hub (2) are both straight.

2. The impeller of the novel high-speed high-pressure blower according to claim 1, characterized in that, The blade surface formed by the tip arc and the root arc of the fan blade (3) is the first blade surface, and the first blade surface adopts a straight transition.

3. The impeller of the novel high-speed high-pressure blower according to claim 2, characterized in that, A wind shield (5) is provided on the outside of the fan blade (3). The distance between the point on the top arc surface (6) of the fan blade (3) and the bottom of the impeller hub (2) conforms to the logarithmic function y(A)=ab*ln(r), where a takes the value 0-0.5mm, a is the gap between the fan blade (3) and the inner wall of the wind shield (5) of the blower, and r is the distance between the point on the top arc surface (6) of the fan blade and the central axis (1).

4. The impeller of the novel high-speed high-pressure blower according to claim 3, characterized in that, The impeller hub (2) curve adopts a Bezier curve, and the angle α between the impeller hub (2) curve and the horizontal plane is (30-60°).

5. The impeller of the novel high-speed high-pressure blower according to claim 4, characterized in that, The angle β between the tip arc of the fan blade (3) and the horizontal plane is 20-50°.

6. The impeller of the novel high-speed high-pressure blower according to claim 5, characterized in that, The first leaf surface is a curved surface, and the first leaf surface also forms an angle δ with the vertical plane. The angle δ between the first leaf surface and the vertical plane is variable, gradually decreasing from the front edge to the tail edge of the first leaf surface, and takes a value of (80-10°).

7. The impeller of the novel high-speed high-pressure blower according to claim 6, characterized in that, The inlet diameter D1 of the impeller is the diameter of the largest circle formed by its leading edge around the axis, the outlet diameter D2 of the impeller is the diameter of the largest circle formed by its trailing edge around the axis, and the outlet diameter D3 of the shroud (5) is the diameter of its largest air outlet section; the ratio of D1 to D2 is in the range of (0.4-0.75), and the ratio of D2 to D3 is in the range of (0.7-0.9).

8. The impeller of the novel high-speed high-pressure blower according to claim 7, characterized in that, The outlet area of ​​the fan blade (3) is greater than the inlet area. S1 is the inlet area of ​​the fan blade (3), S2 is the outlet area of ​​the fan blade (3), and S2 / S1>1.

9. The impeller of the novel high-speed high-pressure blower according to claim 8, characterized in that, The leading edge arc surface of the fan blade (3) is below the upper end surface of the impeller hub (2), and along the axial direction, the tip of the leading edge of the fan blade (3) is higher than the root of the blade.

10. The impeller of the novel high-speed high-pressure blower according to claim 9, characterized in that, The leading edge arc of the fan blade (3) forms an angle θ1 with the impeller rotation axis, which is (70-90°).

11. The impeller of the novel high-speed high-pressure blower according to any one of claims 1-10, characterized in that, The wrap angle ω1 at the root of the impeller blade is within a first preset range, and the wrap angle ω2 at the tip of the blade is within a second preset range, where 60°≤ω2<ω1≤90°.

12. The impeller of the novel high-speed high-pressure blower according to any one of claims 1-10, characterized in that, The trailing edge arc of the fan blade (3) forms an angle θ2 with the impeller rotation axis, which has a value of (20-60°).

13. A motor using the impeller of the novel high-speed high-pressure blower as described in claim 12, characterized in that, The motor (4) adopts a two-stage pressure boosting guide vane design. The motor rotor of the motor (4) adopts a single-spindle structure. The lower side of the central shaft (1) is fixedly installed on the output shaft of the motor (4). The upper side of the motor (4) is fixedly installed with a fan cover (5).

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