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

Abstract

The novel high-speed high-pressure blower motor comprises a center shaft and a motor body, an impeller hub is fixedly installed on the upper side of the center shaft, a plurality of fan blades are fixedly installed on the outer side of the impeller hub, the front edge and the tail edge of the impeller hub are both in a linear type, and the front edge and the tail edge of the impeller hub are both in a linear type. 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, limitation of the size of the center shaft iron core can be avoided, 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] The invention relates to the technical field of hair dryers, in particular to a motor and an impeller of a novel high-speed and high-pressure hair dryer. Background Art

[0002] A high-speed hair dryer is a new type of hair dryer. It mainly relies on the motor to provide powerful power. Its speed can usually reach more than 100,000 revolutions per minute. The motor drives the rotor to drive the fan blades to rotate. When the fan blades rotate, air is sucked in from the air inlet. The resulting wind flow is then blown out from the front nozzle of the hair dryer, which can generate high-speed and strong airflow. Through this high-speed airflow, it can quickly blow away moisture from the hair to achieve the purpose of drying the hair, rather than relying mainly on high temperature to dry the hair like traditional hair dryers. Therefore, the blades of the fan are particularly important.

[0003] Chinese patent CN214711022U proposes a hair dryer blade, including a central axis, an impeller hub is arranged outside the central axis, a fan blade is arranged outside the impeller hub, an air outlet section is arranged on one side of the fan blade, and an air inlet section is arranged on the other side of the fan blade, the air inlet section and the air outlet section are parallel to each other in a top-view direction, the number of the fan blades is six groups, the cross-sections of the air inlet section and the air outlet section are parabolic, high in the middle and low at both ends, the top-view extension line of the air inlet section intersects with the impeller hub, the intersection point is C, the intersection point C is connected to the midline axis, the connecting line is B, the connecting line B forms an angle β with the top-view extension line of the air inlet section, the design of the air inlet section and the air outlet section of the fan blade being parallel to each other in a top-view direction, and the design of the air inlet section and the air outlet section cross-section being parabolic, greatly 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 improves the overall blowing performance by designing the fan blade's air inlet section and air outlet section to be parallel to each other in the top view direction, and the air inlet section and air outlet section's cross-section to be parabolic. However, when blowing at high speed, the flow cross-sectional area is limited by the size of the central axis core, and the rotation speed cannot be increased to continuously increase the air volume.

[0006] Therefore, those skilled in the art provide a novel motor and impeller of a high-speed and high-pressure hair dryer to solve the above problems. Summary of the invention

[0007] The object of the present invention is to provide a novel motor and impeller of a high-speed and high-pressure hair dryer to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A novel high-speed and high-pressure hair dryer 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 mounted on the upper side of the central shaft. A plurality of fan blades are fixedly mounted on the outer side of the impeller hub. The leading edge and the trailing edge of the impeller hub are both straight.

[0010] Furthermore, the blade surface formed by the blade tip arc line and the blade root arc line of the fan blade is the first blade surface, and the first blade surface adopts a straight transition to facilitate 5-axis CNC machining and improve 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 blade top arc surface and the bottom of the impeller hub conforms to the logarithmic function y(A)=ab*ln(r), where a takes a value of 0-0.5 mm, a is the gap between the fan blade and the inner wall of the wind shield of the hair dryer, and r is the distance between the point on the blade top arc surface 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 blade tip arc line and the horizontal plane is (20-50°);

[0014] Furthermore, the first blade surface is a curved surface, and the first blade surface forms an angle δ with the vertical plane. The angle δ between the first blade surface and the vertical plane is variable, and gradually decreases from the leading edge to the trailing edge of the first blade, and has a value of (80-10°);

[0015] Furthermore, 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 wind shield is the diameter of its maximum air outlet cross-section; the ratio range D1 / D2 of D1 and D2 is (0.4-0.75), and the ratio range D2 / D3 of D2 and D3 is (0.7-0.9), so that the fan blade flow channel is smoother, the energy conversion is higher, and the performance is better;

[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 is, the greater the air volume output by the fan blade is, and the smaller the S2 / S1 ratio is (the closer to 1), the higher the vacuum degree formed by the fan blade is;

[0017] Furthermore, the leading edge arc surface of the fan blade is below the upper end surface of the impeller hub, which is convenient for installation and positioning, and along the axial direction, the leading edge blade tip of the fan blade is slightly higher than the blade root, and an angle θ1 is formed between the leading edge arc of the fan blade and the impeller rotation axis, and its value is (70-90°). In some cases, θ1 can also be 90°, which can reduce the impeller load and improve the impeller's work capacity;

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

[0019] Furthermore, an angle θ2 is formed between the arc line of the trailing edge of the blade and the impeller rotation axis, and its value is (20-60°);

[0020] Furthermore, the motor adopts a two-stage boost guide vane design, and the motor rotor of the motor adopts a single-pick structure, which is simple to assemble, suitable for high-speed or ultra-high-speed operation, safe and reliable. The lower side of the center shaft is fixedly installed on the output shaft of the motor, and a wind hood is fixedly installed on the upper side of the motor.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention has a reasonable ratio range between the impeller hub inlet diameter D1, the outlet diameter D2 and the hair dryer air outlet cross-sectional diameter D3, D1 / D2 takes a value of (0.4-0.75), D2 / D3 takes a value of (0.7-0.9), so that the fan blade flow channel is smoother, the energy conversion is higher, the gap between the fan blade and the inner wall of the wind cover of the hair dryer is matched, and the gap a between the two takes a value range of (0-0.5mm), which can avoid airflow leakage loss, improve the work capacity of the high-speed hair dryer motor, achieve high speed and high pressure of the hair dryer, and reduce airflow noise at the same time;

[0022] 2. The motor adopts a two-stage boost guide vane design, which can convert the circumferential (radial) kinetic energy of the high-speed airflow thrown out by the fan blades into axial static pressure, thereby improving the compressive working ability of the high-speed blower motor, thereby achieving the ability to convey airflow under high or ultra-high wind pressure conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 It is a front view of the present invention;

[0025] Figure 3 The structure of the impeller of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 4 The structure of the impeller of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 5 The structure of the impeller of the present invention is shown in FIG. Figure 3 ;

[0028] Figure 6 is a top view of the impeller of the present invention;

[0029] Figure 7 for Figure 5 Cross-section of the middle AA;

[0030] Figure 8 The cross-sectional view of the impeller of the present invention is shown in FIG. Figure 1 ;

[0031] Fig. 9 The structure of the impeller of the present invention is shown in FIG. Figure 4 ;

[0032] Fig.10 The cross-sectional view of the impeller of the present invention is shown in FIG. Figure 2 .

[0033] In the figure: 1, central axis; 2, impeller hub; 3, fan blades; 4, motor; 5, fan cover; 6, blade top arc surface. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0036] In some embodiments, please refer to the drawings of the specification. Figure 1-Figure 10 A novel high-speed and high-pressure hair dryer motor and its impeller, including a central axis 1 and a motor 4, wherein the central axis 1 is the rotating axis of the impeller, an impeller hub 2 is fixedly mounted on the upper side of the central axis 1, and a plurality of fan blades 3 are fixedly mounted on the outer side of the impeller hub 2, the leading edge and the trailing edge of the impeller hub 2 are both straight lines, the blade surface formed by the blade top arc line and the blade root arc line of the fan blade 3 is the first blade surface, and the first blade surface adopts a straight transition, which is convenient for 5-axis CNC machining and improves machining efficiency.

[0037] A wind shield 5 is arranged on the outside of the fan blade 3, and the distance between the point on the blade top curved surface 6 and the bottom of the impeller hub 2 conforms to the logarithmic function y(A)=ab*ln(r), where a takes a value of 0-0.5mm, a is the gap between the fan blade 3 and the inner wall of the wind shield 5 of the hair dryer, and r is the distance between the point on the blade top curved surface 6 and the central axis 1.

[0038] The clearance between the fan blades and the inner wall of the wind cover 5 of the hair dryer can avoid airflow leakage loss, improve the working capacity of the high-speed blower motor 4, achieve high speed and high pressure of the hair dryer, and reduce airflow noise.

[0039] 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°).

[0040] The angle β between the top arc line of the fan blade 3 and the horizontal plane is (20-50°).

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

[0042] The fan blades 3 and the impeller hub 2 are matched, and are not limited by the size of the 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 wind hood 5 is the diameter of its maximum air outlet cross-section; the ratio range D1 / D2 of D1 and D2 is (0.4-0.75), and the ratio range D2 / D3 of D2 and D3 is (0.7-0.9), which makes the flow path of the fan blade 3 smoother, the energy conversion is higher, and the performance is better.

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

[0045] The leading edge arc surface of the fan blade 3 is below the upper end surface of the impeller hub 2, which is convenient for installation and positioning, and along the axial direction, the leading edge blade top of the fan blade 3 is slightly higher than the blade root, and an angle θ1 is formed between the leading edge arc line of the fan blade 3 and the impeller rotation axis, and its value is (70-90°). In some cases, θ can also be 90°, which can reduce the impeller load and improve the impeller's working capacity.

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

[0047] An angle θ2 is formed between the arc line of the trailing edge of the blade 3 and the impeller rotation axis, and its value is (20-60°).

[0048] In some embodiments, Figure 1-Figure 10 As a preferred embodiment of the present invention, the motor 4 adopts a two-stage boost guide vane design, and the motor rotor of the motor 4 adopts a single-pick structure, which is simple to assemble, suitable for high-speed or ultra-high-speed operation, safe and reliable. The lower side of the central axis 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 wind cover 5.

[0049] By adopting a two-stage boost guide vane design, the excess circumferential (radial) kinetic energy of the high-speed airflow thrown out by the fan blades 3 can be converted into axial static pressure, thereby improving the compressive working capacity of the motor 4, thereby achieving the airflow conveying capability under high wind pressure or ultra-high wind pressure conditions.

[0050] The above logarithmic function y(A)=ab*ln(r), because ln(r) is a monotonically increasing function, 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 with the increase of r, then b>0; conversely, if y(A) needs to increase with the increase of r, then b<0. Normally, in the meridian plane model of the fan blade, it may be expected that as r increases, the distance y(A) between the point on the top arc surface and the bottom of the impeller decreases, so b>0 is generally present.

[0051] The range of the logarithmic function is limited to: Since a∈(0,0.5mm), r is the distance between the point on the blade tip arc surface and the rotation axis, its value range is also limited. Let r∈[r min ,r max ]. In order to make the value of y(A) meet the actual size and structural requirements of the fan blade, the value of b must ensure that y(A) is within a reasonable range. For example, when r = r min 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] According to physical principles and actual working conditions, from an aerodynamic point of view, if you want the fan blades to be able to push the air flow more effectively, so that the wind blown out is more concentrated and the wind speed is higher, it may be necessary to change (A) according to a certain rule, thus placing certain requirements on the value of b. For example, if you want to form a specific airflow velocity distribution at the top of the blade, you may need to adjust b to make y(A) satisfy the corresponding aerodynamic equation.

[0053] In the general design of hair dryer blades, the value of b is roughly between 0.5 and 3. In actual design, detailed computational fluid dynamics analysis, experimental testing and other means are needed to accurately determine the value of b.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements 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 the present invention.

Claims

1. A novel impeller of a high-speed and high-pressure hair dryer, comprising a central axis (1), wherein the central axis (1) is a rotating axis of the impeller, and characterized in that: An impeller hub (2) is fixedly mounted on the upper side of the central shaft (1), a plurality of blades (3) are fixedly mounted on the outer side of the impeller hub (2), and the leading edge and the trailing edge of the impeller hub (2) are both straight-line-shaped.

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

4. The impeller of the novel high-speed and high-pressure hair dryer according to claim 3 is 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 and high-pressure hair dryer according to claim 4 is characterized in that: The angle β between the blade tip arc line of the fan blade (3) and the horizontal plane has a value of (20-50°).

6. The impeller of the novel high-speed and high-pressure hair dryer according to claim 5 is characterized in that: The first blade surface is a curved surface, and the first blade surface also forms an angle δ with the vertical plane. The angle δ between the first blade surface and the vertical plane is variable, gradually decreasing from the leading edge to the trailing edge of the first blade, and has a value of (80-10°).

7. The impeller of the novel high-speed and high-pressure hair dryer according to claim 6 is 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 wind shield (5) is the diameter of its maximum air outlet cross-section; the ratio range D1 / D2 of D1 and D2 is (0.4-0.75), and the ratio range D2 / D3 of D2 and D3 is (0.7-0.9).

8. The impeller of the novel high-speed and high-pressure hair dryer according to claim 7 is characterized in that: The outlet area of ​​the fan blade (3) is larger 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 and high-pressure hair dryer according to claim 8, characterized in that: The leading edge cambered surfaces of the fan blades (3) are all below the upper end surface of the impeller hub (2), and along the axial direction, the leading edge blade tops of the fan blades (3) are higher than the blade roots.

10. The impeller of the novel high-speed and high-pressure hair dryer according to claim 9, characterized in that: An angle θ1 is formed between the front edge arc line of the fan blade (3) and the impeller rotation axis, and its value is (70-90°).

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

12. The impeller of the novel high-speed and high-pressure hair dryer according to any one of claims 1 to 10, characterized in that: An angle θ2 is formed between the arc line of the trailing edge of the blade (3) and the impeller rotation axis, and its value is (20-60°).

13. A motor using the impeller of the novel high-speed and high-pressure hair dryer as claimed in claim 12, characterized in that: The motor (4) adopts a two-stage boost guide vane design, the motor rotor of the motor (4) adopts a single-pick structure, the lower side of the central shaft (1) is fixedly mounted on the output shaft of the motor (4), and the upper side of the motor (4) is fixedly mounted with a wind shield (5).

Images