CN117212212A - Small-sized continuous high-speed blower and test mode thereof - Google Patents

Abstract

The present invention relates to the technical field of hair dryers, and more specifically, it relates to a small continuous high-speed hair dryer and its testing method. By improving the optimal design of the hair dryer, it can reduce the wind resistance coefficient of the guide fan blades while ensuring that the air flow within the path is ensured. The value of the flow rate prompts the fluid to be linearly and uniformly led out of the fan duct, allowing the fan blades to operate stably. The position of the fan blades is further stabilized through support auxiliary structures such as springs, bearings, and air guide pads to avoid centrifugal vibration of the fan blades and eventual reaction. On the rotating shaft, it affects the rotation efficiency of the rotating shaft, which greatly improves the operating environment of the fan blades and improves the overall efficiency of the fan. Due to the optimization of the fan blade operating environment, the stability of the fan is improved, further improving the use of the fan. life.

Description

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

Technical field

The present invention relates to the technical field of hair dryers, and more specifically, to a small continuous high-speed hair dryer and its testing method.

Background technique

As brushless motors become increasingly smaller, lighter and faster, there are very few high-efficiency axial flow fans that can match high speeds, especially those with diameters below 100mm. They are used in high-speed hair dryer motors, bladeless fans, and hair curling irons. After the product was launched, the development of small and medium-sized axial flow fans and high-speed brushless DC motors in the home appliance industry gradually began.

The smaller the size of the home appliance, the higher the requirements for motor shock absorption and noise reduction details in its application scenarios. Currently, most improvement methods on the market are by improving the structural size of the brushless motor itself and adapting it to the applicable scenarios of home appliances, but ignore the design impact of incorporating the wind guide structure. When the impeller rotates, the gas enters the impeller axially from the air inlet. It is pushed by the blades on the impeller to increase the energy of the gas, and then flows into the guide vane. The guide vane guides the gas outflow. However, due to the high-speed rotation of the impeller, the angle of the impeller changes. The design of the guide vane can easily cause the gas flowing out of the guide vane to surge intermittently, making the air intake fluency of the axial guide vane worse. At the same time, the spurting gas reacts on the impeller, causing the impeller to vibrate, making it difficult to One of the technical problems to overcome.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a small continuous high-speed hair dryer and a testing method thereof, which have the advantages of linear and smooth air flow, high stability, and long service life.

The above technical objectives of the present invention are achieved through the following technical solutions: a small continuous high-speed hair dryer and its testing method, including a stator assembly, a rotor assembly rotating on the stator assembly, and a rotor assembly sleeved on the stator assembly. The air duct and the fan blades installed on the rotor are characterized in that: the air duct includes an outer cylinder and an inner cylinder arranged on the same circular mandrel as the outer cylinder, and the inner cylinder is sleeved on the rotor assembly. and fixed on the stator assembly;

The outer cylinder has an air inlet part and an air outlet part distributed along its length. An air guide pad is laid on the inner wall of the air inlet part. The air guide pad extends along the axis of the air duct and is located at the air inlet. The part close to the air outlet is inclined outward in a flared shape. The diameter of the fan blade is slightly smaller than the diameter of the air guide pad. The air outlet extends outward in a straight line. The air outlet is in contact with the air outlet. A plurality of evenly distributed guide fan blades are connected and fixed between the outer cylinders. The guide fan blades are arranged in an arc plate airfoil shape. The distance between adjacent guide fan blades is always consistent. The inner wall of the outer cylinder and all A curved path is formed between the outer wall of the inner cylinder and the adjacent guide fan blades, and the adjacent paths have the same volume;

An air inlet angle is provided on the side of the inner cylinder close to the fan blade, and the inclination angle of the air inlet angle is consistent with the inclination angle of the air guide pad.

Preferably, the rotor assembly includes a rotating shaft. The rotating shaft is provided with a rotating bearing, a first balance mass, a second balance mass and an auxiliary bearing along its length direction. The first balance mass and the second balance mass are respectively provided with The two ends of the rotating shaft are stably supported, the auxiliary bearing is connected to the stator assembly, the fan blade is installed on the rotating bearing, and the rotating bearing is connected to the first balance weight. Spring, the spring is sleeved on the fan blade on the rotating shaft.

Preferably, the fan blades include an impeller installed on the rotating bearing and blades evenly distributed along the circumferential direction of the impeller. The diameter of the fan blades is set to be 25.5mm or less, and the impeller diameter is set to 15.5mm or less;

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

Preferably, the inclination angle of the blades is consistent with the inclination angle of the guide fan blades.

Preferably, the air guide pad is made of stainless steel and is installed close to the inner wall of the outer cylinder to limit the installation space of the fan blades in the air cylinder.

Preferably, the installation inclination angle of the blade ranges from 20° to 30°.

To sum up, the present invention has beneficial effects: by improving the optimal 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 uniformly led out of the air duct. It allows the fan blades to operate stably, and further stabilizes the position of the fan blades through springs, bearings, air guide pads and other supporting auxiliary structures to avoid centrifugal vibration of the fan blades, which will eventually react on the rotating shaft and affect the rotation efficiency of the rotating shaft, thus greatly affecting the rotation efficiency of the rotating shaft. It improves the operating environment of the fan blades and improves the overall efficiency of the fan. 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 extended.

Description of drawings

Figure 1 is a schematic diagram of the internal structure of an embodiment of the present invention;

Figure 2 is a cross-sectional view of an embodiment of the present invention;

Figure 3 is a schematic structural diagram of an air guide pad according to an embodiment of the present invention;

Figure 4 is a schematic front structural view of the fan blade according to the embodiment of the present invention;

Figure 5 is a schematic side structural view of the fan blade according to the embodiment of the present invention.

Reference signs: 1. Stator assembly; 2. Rotor assembly; 21. Rotating shaft; 22. Rotating bearing; 23. First balance weight; 24. Second balance weight; 25. Auxiliary bearing; 26. Spring; 3. Hairdryer ; 31. Outer cylinder; 32. Inner cylinder; 33. Air inlet part; 34. Air outlet part; 35. Air guide pad; 36. Guide fan blades; 37. Path; 38. Air inlet guide angle; 4. Fan blades ; 41. Impeller; 42. Blades.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

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 may be directly or indirectly connected to the other component.

It should be understood that the terms "length", "width", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "top" The orientations or positional relationships indicated by "bottom", "inside", "outer", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the device referred to. Or elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations on the invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless otherwise explicitly and specifically limited.

Since the structure of the axial flow fan is directly related to the aerodynamic performance of the fan, including the design parameter distribution between blades, the interference of moving and stationary blades, axial and radial gaps, and various vortex structures. Based on the above theory, this implementation provides a small continuous high-speed hair dryer and its testing method.

A small continuous high-speed hair dryer and its testing method, see Figure 1. The stator assembly 1 is fixed. While the rotor assembly 2 is used to drive the fan blade 4 to rotate at high speed, by optimizing the structural design of the air guide 3, that is, the air duct 3, The fluid is driven by the fan blade 4 and flows into the wind cylinder 3 , generating a high pressure in the semi-enclosed space formed by the outer cylinder 31 and the inner cylinder 32 arranged on the same central axis of the outer cylinder 31 . The fluid flows from the outer cylinder 31 The air enters into the air inlet 33 and is guided through the air outlet 34 to flow into the semi-enclosed space. An air guide pad 35 is laid on the inner wall of the air inlet 33. The air guide pad 35 will reduce the air inlet diameter of the outer cylinder 31, and cooperate with By adjusting the design ratio of the diameter of the impeller 41 and the length of the blade 42 in the fan blade 4, while maximizing the fluid flow rate, the fluid entering the air inlet 33 obtains a greater pressure through the outer cylinder 31 with a smaller air inlet diameter. This provides greater power for the subsequent flow of fluid.

Referring to Figures 4 and 5, the length of the blade 42 directly affects the change of fluid flow at the same rotation speed, but the diameter of the impeller 41 directly affects the stability of the blade 42. For this reason, the two cooperate with each other and work together. When the inner diameter of the outer cylinder 31 is determined, it is 26mm. At the same rotation speed, experiments are designed based on centrifugal force and the most suitable diameter of the fan blade 4 is found to be L=25.5mm, and the diameter of the impeller 41 is L1=14.5mm.

The calculation method of centrifugal force is F=mw ² r, where m represents the mass of fan blade 4, w represents the angular velocity of fan blade 4, and r represents the radius of fan blade 4. To prevent the swing of fan blade 4, its centrifugal force must not exceed Large, where the angular velocity w = 2πn, n represents the rotational speed of the fan blade 4, where the rotational speed is determined by the rotating shaft 21, from which it is concluded that F = (2πn) ² mr, and therefore it is known that under the same rotational speed, the fan blade The size of the radius 4 is proportional to the size of the centrifugal force. At the same rotation speed, appropriately reducing the diameter of the fan blade 4 can reduce the centrifugal force of the fan blade 4 and help ensure the stable rotation of the fan blade 4.

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 evenly relaxed, that is, to ensure that the subsequent wind speed is linear, uniform and smooth, and can directly act on the human body for blowing operations.

The fluid that obtains greater power flows out from the air outlet part 34. The air inlet part 33 is inclined outward and has a flared design near the air outlet part 34. It is matched with the installation of the inner cylinder 32 on the stator assembly 1. , providing a guide space for the rapid flow of fluid, and 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 there is a gap between the inner cylinder 32 and the outer cylinder 31. The guide space is equally divided, and the guide blades 36 are arranged in an arc plate airfoil shape, so that a curved guide is formed between the inner wall of the outer cylinder 31, the outer wall of the inner cylinder 32 and the adjacent guide fan blades 36. Path 37 for fluid circulation.

Based on the above-mentioned determination of the diameter of the outer cylinder 31, the provided air guide pad 35 can not only reduce the diameter of the air inlet of the outer cylinder 31, but also simultaneously limit the centrifugal swing of the rotation of the fan blade 4 during the process of completing the fluid pressurization. Starting from the fan blade 4 on the rotor assembly 2, the rotating shaft 21 on the rotor assembly 2 drives the fan blade 4 to rotate at a high speed. When rotating at a high speed, centrifugal force will be generated, and due to the space limitation of the air guide pad 35, the fan blade 4 is installed on When on the rotating bearing.

When the rotating shaft 21 rotates, the direction of the centrifugal force always points 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, to produce deflection. The installation of the rotary bearing 22 at the end of 21 and the fan blade 4 causes the rotation shaft 21 to deform more seriously, causing the fan blade 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 fan blade 4 activity space, reducing deflection and improving efficiency, and the rotating shaft 21 is a flexible shaft.

Under this condition, the rotating shaft 21 is provided with a rotating bearing 22, a first balance weight 23, a second balance weight 24 and an auxiliary bearing 25 along its length direction. The auxiliary bearing 25 and the second balance weight 24 complete the rotation of the rotating shaft 21. It is connected and installed with the stator assembly 1, and relies on the auxiliary bearing 25 and the second balance block 24 to synchronize to one end of the auxiliary support shaft 21, and the other end is auxiliary supported by the first balance block 23, and the first balance block 23, The two balance weights 24 and the auxiliary bearing 25 support the length of a large part of the rotating shaft 21, improve the stability of the rotating shaft 21, and rely on the rotating bearing 22 to install the fan blade 4. At the same time, a spring 26 is set on the rotating shaft 21, and the rotation shaft 21 is passed through the spring 26. The elastic compression keeps the distance between the rotating bearing 22 and the first support shaft constant.

The surrounding of the outer cylinder 31, the compression of the inner cylinder 32, and the arc plate airfoil guide blades 36 can effectively reduce the flow loss. Based on the fact that the number of blades 42 of the fan blade 4 is 13, the installation angles of the blades 42 are sequentially Adjust, the angle adjustment range is between 20 degrees and 30 degrees. And conduct equal portion tests at angles of 0.5 degrees, and observe the flow rate in the air duct 3 at different angles.

Therefore, in order to ensure a large flow rate in the air duct 3, the inclination angle of the installation of the blades 42 will be determined to be in the range of 20°-30°, with 29.5° being the optimal angle.

After determining the inclination angle at which the blades 42 are installed, in order to reduce the wind resistance coefficient in the air cylinder 3, the inclination angle of the guide blades 36 is consistent with the inclination angle at which the blades 42 are installed. Under this construction, the power, wind speed, rotation speed and noise were tested again:

Note: This wind speed is the maximum wind speed measured directly by the anemometer at the air outlet.

By improving the optimized design of the air duct 3, while reducing the wind resistance coefficient of the guide fan blades 36, it is possible to ensure the value of the flow rate in the path 37, prompting the fluid to linearly and uniformly lead out of the air duct 3, so that the fan blades 4 can operate stably, and Through supporting auxiliary structures such as springs 26, bearings, and air guide pads 35, the position of the fan blade 4 is further stabilized to avoid centrifugal vibration of the fan blade 4, which will eventually react on the rotating shaft 21 and affect the rotation efficiency of the rotating shaft 21. Therefore, the operating environment of fan blade 4 is greatly improved, and the overall efficiency of the fan is improved. Due to the optimization of the operating environment of fan blade 4, the stability of the fan is improved, and the service life of the fan is further extended.

The above embodiments are only explanations of the present invention and are not limitations of the present invention. Those skilled in the art can make modifications to the embodiments without creative contribution as needed after reading this description. However, as long as the claims of the present invention are are protected by patent law.

Claims (6)

1. The utility model provides a small-size high-speed hair-dryer of persistence and test mode thereof, includes stator module (1), rotate in rotor module (2) on stator module (1), cover are located dryer (3) on stator module (1) and install in flabellum (4) on the rotor, characterized by: the air duct (3) comprises an outer cylinder (31) and an inner cylinder (32) which is arranged on the same center axis as the outer cylinder (31), and the inner cylinder (32) is sleeved on the rotor assembly (2) and is fixed on the stator assembly (1);

the outer cylinder (31) is provided with an air inlet part (33) and an air outlet part (34) along the length direction of the outer cylinder, the inner wall of the air inlet part (33) is paved with an air guide pad (35), the air guide pad (35) extends along the axial direction of the air cylinder (3), the air inlet part (33) is inclined outwards to form a flaring shape near the air outlet part (34), the diameter of each fan blade (4) is slightly smaller than the diameter of the air guide pad (35), the air outlet part (34) extends outwards in a straight line, a plurality of uniformly distributed guide blades (36) are fixedly connected between the air outlet part (34) and the outer cylinder (31), the guide blades (36) are arranged in a circular arc plate wing shape, the distance between the adjacent guide blades (36) is always kept consistent, a curve conducting path (37) is formed among the inner wall of the outer cylinder (31), the outer wall of the inner cylinder (32) and the adjacent guide blades (4) (36), and the volumes of the adjacent paths (37) are the same;

an air inlet guide angle (38) is arranged on one side of the inner cylinder (32) close to the fan blades (4), and the inclination angle of the air inlet guide angle (38) is consistent with that of the air guide pad (35);

the method also comprises the following steps of:

s1, constructing a test foundation for adjustment, and selecting a plurality of air cylinders (3) with consistent inner and outer diameters, wherein the number of the fan blades (4) is set consistently, and the change setting is carried out on the installation angles of the fan blades (4), and the angle adjustment range is 20-30 degrees;

s2, recording the power, the rotating speed and the flow of the blower at the same time, and finding out the optimal installation angle of the fan blade (4);

s3, limiting the installation angle of the fan blade (4), and calculating the data of the blower power, the wind speed, the rotating speed and the noise by continuously adjusting the inlet angle of the guide fan blade (36), so as to find out the relatively proper inlet angle of the guide fan blade (36).

2. The small-sized continuous high-speed blower and the testing mode thereof according to claim 1, wherein the small-sized continuous high-speed blower is characterized in that: the rotor assembly (2) comprises a rotating shaft (21), 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 the length direction of the rotating shaft, the first balancing block (23) and the second balancing block (24) are respectively arranged at two ends of the rotating shaft (21) and stably supported, the auxiliary bearing (25) is connected with the stator assembly (1), the fan blade (4) is mounted on the rotating shaft (21), 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. The small-sized continuous high-speed blower and the testing mode thereof according to claim 2, wherein the small-sized continuous high-speed blower is characterized in that: the fan blades (4) comprise impellers (41) arranged on the rotary shaft (21) and blades (42) uniformly distributed along the circumferential direction of the impellers (41), the diameter of the fan blades (4) is set to be below 25.5mm, and the diameter of the impellers (41) is set to be below 15.5 mm;

wherein the calculation formula of centrifugal force: f= (2n) ² mr, n is the rotation speed, m is the mass, r is the radius, and under the condition of constant rotation speed, the magnitude of the centrifugal force of the fan blade (4) is in direct proportion to the magnitude of the radius of the fan blade (4).

4. A small persistent high-speed blower and test mode thereof according to claim 3, wherein: the inclination angle of the blade (42) is consistent with the inclination angle of the guide blade (36).

5. The small-sized continuous high-speed blower and the testing mode thereof according to claim 1, wherein the small-sized continuous high-speed blower is characterized in that: the air guide pad (35) is made of stainless steel, is attached to the inner wall of the outer cylinder (31) and is used for limiting the installation space of the fan blades (4) in the air cylinder (3).

6. The small-sized continuous high-speed blower and the testing mode thereof according to claim 4, wherein the small-sized continuous high-speed blower is characterized in that: the blades (42) are mounted at an angle of inclination in the range of 20 DEG to 30 deg.