Small continuous high-speed hair dryer and testing mode therefor

Abstract

A small continuous high-speed hair dryer and a testing mode therefor. The hair dryer comprises a stator assembly (1), a rotor assembly (2) rotating on the stator assembly (1), an air duct (3) sleeved on the stator assembly (1), and a fan (4) mounted on a rotor. According to the hair dryer, by improving the optimized design of the air duct (3), the numerical value of the flow in a path can be ensured while the wind resistance coefficient of guide fan blades (36) is reduced, so that a fluid is linearly and uniformly led out of the air duct (3), the fan (4) stably works, and the position of the fan (4) is further stabilized by means of supporting assist structures such as a spring (26), a bearing, and an air guide pad (35), thereby preventing the fan (4) from centrifugally vibrating, which finally reacts on a rotating shaft (21), thus preventing the rotating efficiency of the rotating shaft (21) from being impacted. Therefore, the operation environment of the fan (4) is also greatly improved, the overall efficiency of the hair dryer is improved, and due to the optimization of the operation environment of the fan (4), the stability of the hair dryer is improved, and the service life of the hair dryer is further prolonged.

Description

A small continuous high-speed hair dryer and its testing method Technical Field

[0001] The present invention relates to the technical field of hair dryers, and more particularly to a small continuous high-speed hair dryer and a testing method thereof. Background Art

[0002] Nowadays, brushless motors are becoming increasingly smaller, lighter, and faster, but there are few high-efficiency axial fans that match the high speeds, especially those with a diameter of less than 100mm. After the launch of high-speed hair dryer motors, bladeless fans, curling irons and other products, the development of small and medium-sized axial fans and high-speed DC brushless motors in the home appliance industry has gradually begun. Technical issues

[0003] The smaller the size of the home appliance, the higher the requirements for the details of the motor's vibration and noise reduction in its application scenario. Currently, most of the improvements on the market are to improve the structural dimensions of the brushless motor itself and adapt it to the applicable scenarios of home appliances, but ignore the design impact of the air guide structure. When the impeller rotates, the gas enters the impeller axially from the air inlet, and is pushed by the blades on the impeller, which increases the energy of the gas. It then flows into the guide vanes, which guide the gas outflow. However, due to the high-speed rotation of the impeller, the design of the impeller angle and the design of the guide vanes can easily cause the gas flowing out of the guide vanes to gush intermittently, making the axial guide vane intake smoothness worse. At the same time, the gushing gas reacts on the impeller, causing the impeller to vibrate, which has become one of the difficult technical problems to overcome. Technical Solutions

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a small continuous high-speed hair dryer and a testing method thereof, which has the advantages of smooth linear airflow, high stability and long service life.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a small continuous high-speed hair dryer and a testing method thereof, comprising a stator assembly, a rotor assembly rotating on the stator assembly, a wind tube sleeved on the stator assembly, and fan blades mounted on the rotor, wherein the wind tube comprises an outer tube and an inner tube coaxially arranged with the outer tube, the inner tube sleeved on the rotor assembly and fixed to the stator assembly;

[0006] The outer cylinder is provided with an air inlet portion and an air outlet portion along its length direction, and an air guide pad is laid on the inner wall of the air inlet portion, and the air guide pad extends along the axis direction of the air cylinder and is inclined outwardly to form a flared shape at the air inlet portion near the air outlet portion. The diameter of the fan blade is slightly smaller than the diameter of the air guide pad, and the air outlet portion extends outward in a straight line, and a plurality of evenly distributed guide blades are connected and fixed between the air outlet portion and the outer cylinder, and the guide blades are arranged in an arc plate airfoil shape, and the distance between adjacent guide blades is always consistent, and a curved conductive path is formed between the inner wall of the outer cylinder, the outer wall of the inner cylinder and the adjacent guide blades, and the volume of adjacent paths is the same;

[0007] The inner cylinder is provided with an air inlet guide angle on one side close to the fan blade, and the inclination angle of the air inlet guide angle is consistent with the inclination angle of the air guide pad.

[0008] Preferably, the rotor assembly includes a rotating shaft, and the rotating shaft is provided with a rotating bearing, a first balancing block, a second balancing block and an auxiliary bearing along its own length direction. The first balancing block and the second balancing block are respectively arranged at both ends of the rotating shaft and provide stable support. The auxiliary bearing is connected to the stator assembly, and the fan blades are installed on the rotating bearing. A spring is connected between the rotating bearing and the first balancing block, and the spring is sleeved on the fan blades on the rotating shaft.

[0009] Preferably, the fan blades include an impeller mounted on the rotary bearing and blades evenly distributed along the circumference of the impeller, and the diameter of the fan blades is set to be less than 25.5 mm, and the diameter of the impeller is set to be less than 15.5 mm;

[0010] The calculation formula of centrifugal force is: F=(2πn) 2 mr, n is the rotational speed, m is the mass, and r is the radius. When the rotational speed is constant, the centrifugal force of the fan blade is proportional to the radius of the fan blade.

[0011] Preferably, the inclination angle of the blade is consistent with the inclination angle of the guide fan blade.

[0012] Preferably, the air guide pad is made of stainless steel and is installed in contact with the inner wall of the outer tube to limit the installation space of the fan blades in the air tube.

[0013] Preferably, the blades are installed at an angle of inclination of 20 o -30 o Between degrees. Beneficial effects

[0014] To sum up, the present invention has the beneficial effects: by improving the optimized design of the air duct, while reducing the wind resistance coefficient of the guide fan blades, it can ensure the value of the flow rate in the path, and promote the fluid to be linearly and evenly drawn out of the air duct, so that the fan blades can operate stably, and through supporting auxiliary structures such as springs, bearings, and wind guide pads, the position of the fan blades is further stabilized to avoid centrifugal vibration of the fan blades, which ultimately reacts on the rotating shaft and affects the rotation efficiency of the rotating shaft. Therefore, the operating environment of the fan blades is greatly improved, and the overall efficiency of the fan is improved. Due to the optimization of the fan blade operating environment, the stability of the fan is improved, and the service life of the fan is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of the internal structure of an embodiment of the present invention;

[0016] FIG2 is a cross-sectional view of an embodiment of the present invention;

[0017] FIG3 is a schematic structural diagram of an air guide pad according to an embodiment of the present invention;

[0018] FIG4 is a schematic diagram of the front structure of a fan blade according to an embodiment of the present invention;

[0019] FIG5 is a schematic diagram of the side structure of the fan blade according to an embodiment of the present invention.

[0020] Figure numerals: 1. stator assembly; 2. rotor assembly; 21. rotating shaft; 22. rotating bearing; 23. first balancing block; 24. second balancing block; 25. auxiliary bearing; 26. spring; 3. air cylinder; 31. outer cylinder; 32. inner cylinder; 33. air inlet; 34. air outlet; 35. air guide pad; 36. guide blade; 37. path; 38. air inlet guide angle; 4. fan blade; 41. impeller; 42. blade. Modes for Carrying Out the Invention

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] It should be noted that when a component is referred to as being “fixed to” or “disposed on” another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being “connected to” another component, it can be directly or indirectly connected to the other component.

[0023] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0025] Since the structure of the axial flow fan is directly related to the aerodynamic performance of the fan, including the combined influence of multiple factors such as the design parameter distribution between blades, the interference between moving and stationary blades, axial and radial clearances, and various vortex structures, based on the above theory, this implementation provides a small continuous high-speed hair dryer and its testing method.

[0026] A small continuous high-speed hair dryer and a testing method thereof, see Figure 1, the stator assembly 1 is fixed, and while the rotor assembly 2 is used to drive the fan blades 4 to rotate at high speed, by optimizing the structural design of the air guide tube 3, that is, the air tube 3, the fluid is driven by the fan blades 4 to flow into the air tube 3, and a higher pressure is generated in the semi-enclosed space formed by the outer tube 31 and the inner tube 32 arranged on the same central axis of the outer tube 31. The fluid enters from the air inlet 33 of the outer tube 31, is guided by the air outlet 34, and flows into the semi-enclosed space, wherein an air guide pad 35 is laid on the inner wall of the air inlet 33, and the air inlet diameter of the outer tube 31 is reduced by the air guide pad 35, and the design ratio of the diameter of the impeller 41 and the length of the blade 42 in the fan blade 4 is adjusted. While maximizing the fluid flow rate, the fluid entering the air inlet 33 obtains a higher pressure through the outer tube 31 with a smaller air inlet diameter, thereby providing greater power for the subsequent flow of the fluid.

[0027] 4 and 5 , the length of the blade 42 directly affects the change in fluid flow at the same speed, but the diameter of the impeller 41 directly affects the stability of the blade 42. Therefore, the two cooperate with each other and work together. When the inner diameter of the outer cylinder 31 is determined to be 26 mm, at the same speed, an experiment was designed based on centrifugal force to find the most suitable diameter of the fan blade 4 is L=25.5 mm, and the diameter of the impeller 41 is L1=14.5 mm.

[0028] The centrifugal force is calculated as F=mw2 r, where m represents the mass of the blade 4, w represents the angular velocity of the blade 4, and r represents the radius of the blade 4. To prevent the blade 4 from swinging, its centrifugal force must not be too large. The angular velocity w = 2πn, and n represents the rotation speed of the blade 4. The rotation speed is determined by the shaft 21. Therefore, F = (2πn) 2 mr, therefore, we know that under the same rotational speed, the radius of the fan blade 4 is proportional to the centrifugal force. Under the same rotational speed, appropriately reducing the diameter of the fan blade 4 can reduce the centrifugal force of the fan blade 4, which helps to ensure the stable rotation of the fan blade 4.

[0029] When the fluid enters the air outlet 34, it is necessary to appropriately slow down the fluid flow rate and ensure that the fluid in the air outlet 34 is uniform and smooth, that is, to ensure that the subsequent wind speed is linear, uniform and smooth, and can directly act on the human body to perform a blowing operation.

[0030] The fluid that obtains greater power flows out from the air outlet 34, and is designed to be flared outward at the air inlet 33 near the air outlet 34. Combined with the installation of the inner cylinder 32 on the stator assembly 1, a guide space is provided for the rapid flow of the fluid. At the same time, a plurality of evenly distributed guide blades 36 are connected and fixed between the air outlet 34 and the outer cylinder 31, so that the guide space between the inner cylinder 32 and the outer cylinder 31 is equally divided. In addition, the guide blades 36 are arranged in the shape of an arc plate airfoil, so that a curved conductive path 37 for fluid circulation is formed between the inner wall of the outer cylinder 31, the outer wall of the inner cylinder 32 and the adjacent guide blades 36.

[0031] Based on the above-mentioned determination of the diameter of the outer cylinder 31, the set air guide pad 35 can not only reduce the diameter of the air inlet of the outer cylinder 31, but also synchronously limit the centrifugal swing of the rotation of the fan blade 4 during the process of completing the fluid pressurization. The fan blade 4 on the rotor assembly 2 is driven by the rotating shaft 21 on the rotor assembly 2 to rotate at high speed. Centrifugal force will be generated during high-speed rotation, and due to the space limitation of the air guide pad 35, the fan blade 4 is installed on the rotating bearing.

[0032] When the rotating shaft 21 rotates, the direction of the centrifugal force is always directed to the center of the rotating shaft 21, and in turn acts on the axial direction of the rotating shaft 21 through the axial component of the rotating shaft 21, causing the rotating shaft 21 to bend and deform, that is, deflection is generated. In addition, the installation of the rotating bearing 22 and the fan blades 4 at the end of the rotating shaft 21 makes the deformation of the rotating shaft 21 more serious, causing the fan blades 4 to swing left and right. When the inner diameter of the outer cylinder 31 determines the size, the air guide pad 35 further limits the activity space of the fan blades 4, reduces the deflection, and improves efficiency. In addition, the rotating shaft 21 is a flexible shaft.

[0033] Under this condition, a rotating bearing 22, a first balancing block 23, a second balancing block 24 and an auxiliary bearing 25 are provided along the length direction of the rotating shaft 21. The auxiliary bearing 25 and the second balancing block 24 complete the connection and installation of the rotating shaft 21 and the stator assembly 1. The auxiliary bearing 25 and the second balancing block 24 are synchronized to auxiliary support one end of the rotating shaft 21, and the other end is auxiliary supported by the first balancing block 23. The first balancing block 23, the second balancing block 24 and the auxiliary bearing 25 support the length of most of the rotating shaft 21, thereby improving the stability of the rotating shaft 21. The fan blades 4 are installed with the help of the rotating bearing 22. At the same time, a spring 26 is sleeved on the rotating shaft 21, which will be elastically compressed by the spring 26 to ensure that the distance between the rotating bearing 22 and the first support shaft remains constant.

[0034] The surrounding of the outer cylinder 31 and the compression of the inner cylinder 32, combined with the arc-shaped airfoil guide vanes 36, effectively reduce flow losses. Given that the fan 4 has 13 blades 42, the installation angles of the blades 42 were adjusted sequentially within a range of 20 to 30 degrees. Tests were conducted at equal intervals of 0.5-degree angles, observing the flow rate within the air duct 3 at various angles.

[0035]

[0036] Therefore, in order to ensure a large flow rate in the air duct 3, the inclination angle of the blade 42 is determined to be within the range of 20 o -30 o Among them, 29.5 o For the best angle.

[0037] After determining the inclination angle of the blades 42, in order to reduce the drag coefficient in the wind tube 3, the inclination angle of the guide blades 36 was kept consistent with the inclination angle of the blades 42. Under this configuration, the power, wind speed, rotation speed and noise level were tested again:

[0038]

[0039] Note: This wind speed is the maximum wind speed directly tested by the anemometer at the air outlet.

[0040] By improving the optimized design of the air duct 3, while reducing the drag coefficient of the guide blades 36, the flow rate within the path 37 can be ensured, prompting the fluid to be linearly and evenly drawn out of the air duct 3, allowing the blades 4 to operate stably. Furthermore, the support auxiliary structures such as the spring 26, bearings, and air guide pads 35 further stabilize the position of the blades 4, preventing centrifugal vibration of the blades 4, which ultimately reacts on the shaft 21 and affects the rotation efficiency of the shaft 21. This also greatly improves the operating environment of the blades 4, increases the overall efficiency of the fan, and due to the optimization of the operating environment of the blades 4, improves the stability of the fan, further increasing the service life of the fan.

[0041] The above embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the embodiments as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A small continuous high-speed hair dryer and a test method thereof, comprising a stator assembly (1), a rotor assembly (2) rotating on the stator assembly (1), a wind tube (3) sleeved on the stator assembly (1), and a fan blade (4) mounted on the rotor, wherein: The wind cylinder (3) comprises an outer cylinder (31) and an inner cylinder (32) arranged on the same central axis as the outer cylinder (31); the inner cylinder (32) is sleeved on the rotor assembly (2) and fixed on the stator assembly (1); The outer tube (31) is provided with an air inlet (33) and an air outlet (34) along its length direction; an air guide pad (35) is laid on the inner wall of the air inlet (33); the air guide pad (35) extends along the axial direction of the air tube (3) and is inclined outwardly in a flared shape at a position near the air inlet (33) and the air outlet (34); the diameter of the fan blade (4) is slightly smaller than the diameter of the air guide pad (35); and the air outlet (34) is straight outward. A plurality of evenly distributed guide blades (36) are connected and fixed between the air outlet portion (34) and the outer cylinder (31), the guide blades (36) are arranged in the shape of circular arc plates, the distance between adjacent guide blades (36) is always kept consistent, a curved conductive path (37) is formed between the inner wall of the outer cylinder (31), the outer wall of the inner cylinder (32) and adjacent guide blades (4) (36), and the volumes of adjacent paths (37) are the same; A wind inlet guide angle (38) is provided on a side of the inner cylinder (32) close to the fan blade (4), and the inclination angle of the wind inlet guide angle (38) is consistent with the inclination angle of the wind guide pad (35); It also includes the test method for testing hair dryers, the following steps: S1: Setting up the test base adjustment, selecting a plurality of air ducts (3) with the same inner and outer diameters, wherein the number of fan blades (4) is set to be the same, and changing the installation angle of the fan blades (4), wherein the angle adjustment range is 20 degrees to 30 degrees; S2: According to the power, speed and flow rate of the hair dryer recorded at the same time, find out the best installation angle of the fan blade (4); S3: limiting the installation angle of the fan blade (4), and calculating the data of the hair dryer power, wind speed, rotation speed and noise by continuously adjusting the entry angle of the guide fan blade (36), so as to find a relatively suitable entry angle of the guide fan blade (36).

2. A small continuous high-speed hair dryer and a test method thereof according to claim 1, characterized in that: The rotor assembly (2) comprises a rotating shaft (21), wherein the rotating shaft (21) is provided with a rotating shaft (21) bearing, a first balancing block (23), a second balancing block (24) and an auxiliary bearing (25) along its length direction, wherein the first balancing block (23) and the second balancing block (24) are respectively arranged at two ends of the rotating shaft (21) and serve as a stable support, wherein the auxiliary bearing (25) is connected to the stator assembly (1), and the fan blade (4) is mounted on the rotating shaft (21) bearing, and a spring (26) is connected between the rotating shaft (21) bearing and the first balancing block (23), and the spring (26) is sleeved on the rotating shaft (21).

3. A small continuous high-speed hair dryer and a test method thereof according to claim 2, characterized in that: The fan blade (4) comprises an impeller (41) mounted on the rotating shaft (21) and blades (42) evenly distributed along the circumference of the impeller (41), wherein the diameter of the fan blade (4) is set to be less than 25.5 mm, and the diameter of the impeller (41) is set to be less than 15.5 mm; The calculation formula of centrifugal force is: F= (2πn) 2 mr, n is the rotational speed, m is the mass, and r is the radius. When the rotational speed is constant, the centrifugal force of the fan blade (4) is proportional to the radius of the fan blade (4).

4. A small continuous high-speed hair dryer and a test method thereof according to claim 3, characterized in that: The inclination angle of the blade (42) is consistent with the inclination angle of the guide blade (36).

5. A small continuous high-speed hair dryer and a testing method thereof according to claim 1, characterized in that: The air guide pad (35) is made of stainless steel and is installed in close contact with the inner wall of the outer cylinder (31) to limit the installation space of the fan blade (4) in the wind cylinder (3).

6. A small continuous high-speed hair dryer and a testing method thereof according to claim 4, characterized in that: The blade (42) is installed at an angle of inclination ranging from 20 o -30 o Between degrees.

Images