Novel noise reduction fan blade and high-speed fan

Abstract

One end of the novel noise reduction fan blade is an air inlet portion, the other end of the novel noise reduction fan blade is an air outlet portion, the novel noise reduction fan blade comprises a base and a blade body, the base is provided with an installation hole, the center line of the installation hole is the rotation axis of the base, the blade body is installed on the base, and the diameter of the base is increased from the air inlet portion to the air outlet portion. A wake flow turbulence structure is arranged at the end of the blade of the air outlet part and provided with at least one convex part and at least one concave part adjacent to the convex part, and the wake flow turbulence structure is arranged at the air outlet end of the blade, so that pneumatic noise generated by the blade can be effectively reduced, and the noise frequency is improved; the base of which the diameter is gradually increased from the air inlet end to the air outlet end is adopted, and the wall surface of the base which is gradually increased plays a role in guiding flow, so that the efficiency of the fan blade is improved; the size of the blade is gradually reduced from the air inlet end to the air outlet end, the fluid speed is effectively increased, and the fan blade efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed fans, and in particular to a novel noise-reducing fan blade and a high-speed fan. Background Art

[0002] High-speed hair dryers use high-speed brushless motors, and their speed is usually over 100,000 revolutions per minute, or even higher. This significantly increases the wind speed and air volume, greatly shortening the time it takes to dry your hair. High-speed hair dryers use high-speed motors to generate strong winds. This high-speed motor can drive the fan blades to rotate at extremely high speeds, generating a strong wind flow. The wind flow is heated when it passes through the electric heating element, and the strong wind is blown onto the hair through the air nozzle, quickly removing moisture from the hair and drying the hair quickly. However, because high-speed hair dryers are very close to the human ear, the noise greatly affects the user experience, especially the aerodynamic noise generated when high-speed airflow passes through. The fan blades, as an important component of a high-speed hair dryer, are noisy on the windward side of the air inlet. In addition, the current fan blades are not efficient enough for high-speed hair dryers, and the flow rate is not large enough, which affects the use effect and experience of high-speed hair dryers. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the utility model provides a new noise-reducing fan blade, which solves the technical problems in the existing technology of high aerodynamic noise, poor experience and low fan efficiency when high-speed airflow passes through the fan blade.

[0004] The utility model achieves the above-mentioned purpose through the following technical solutions: a new type of noise reduction fan blade, one end of the new type of noise reduction fan blade is an air inlet part, and the other end is an air outlet part, including a base and a blade, the base has a mounting hole, the center line of the mounting hole is the rotation axis of the base, the blade is installed on the base, the diameter of the base increases from the air inlet part to the air outlet part, and the blade end of the air outlet part is provided with a wake spoiler structure, and the wake spoiler structure has at least one convex portion and at least one concave portion arranged adjacent to the convex portion.

[0005] Preferably, the base is a rotating body, and the rotating body is a rotating body surrounded by a rotating surface formed by a parabola branch with the vertex removed rotating around the rotation axis of the base.

[0006] Preferably, in a direction perpendicular to the outer surface of the base, the size of the blade end of the air inlet portion is larger than the size of the blade end of the air outlet portion.

[0007] Preferably, with respect to the area of ​​the blade perpendicular to the wind direction, the area of ​​the blade at the wind inlet is greater than the area of ​​the blade at the wind outlet.

[0008] Preferably, a connection line on the surface of the base formed by the blades being installed on the base is an arc forming a certain angle with the rotation axis of the base, and the connection line is evenly arranged around the rotation axis.

[0009] Preferably, the wake spoiler structure is sawtooth-shaped.

[0010] Preferably, the wake spoiler structure is wavy.

[0011] A high-speed fan comprises the novel noise-reducing fan blade as described above, a rotating shaft, a stator assembly and a rotor assembly, wherein the air outlet of the novel noise-reducing fan blade faces the stator assembly, and the novel noise-reducing fan blade is fixedly mounted on the rotating shaft through the mounting hole.

[0012] Compared with the prior art, the beneficial effects obtained by the present invention are:

[0013] The utility model discloses a novel noise-reducing fan blade, which has an air inlet at one end and an air outlet at the other end, and includes a base and a blade. The base has a mounting hole, the centerline of which is the rotation axis of the base. The blade is mounted on the base, and the diameter of the base increases from the air inlet to the air outlet. The blade end of the air outlet is provided with a wake flow spoiler structure, the wake flow spoiler structure having at least one protrusion and at least one recessed portion adjacent to the protrusion. By providing the wake flow spoiler structure at the air outlet end of the blade, the aerodynamic noise generated by the blade can be effectively reduced and the noise frequency can be improved. The base is designed to have a gradually increasing diameter from the air inlet to the air outlet, and the base is coaxial with the mounting hole of the fan blade. The gradually increasing wall surface acts as a flow guide, thereby improving the efficiency of the fan blade. The blade size gradually decreases from the air inlet to the air outlet. According to Bernoulli's principle, the flow velocity of the fluid increases when flowing through an area with a smaller cross-section, which can effectively increase the fluid velocity and further improve the efficiency of the fan blade. The invention solves the technical problems of the existing high-speed fan, such as high aerodynamic noise, poor user experience and low blade efficiency when the high-speed airflow passes through the fan blade, and has the beneficial effects of good quiet effect and high fan blade efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0015] Figure 1 Schematic diagram of the new noise reduction fan blade of the utility model Figure 1 .

[0016] Figure 2 Schematic diagram of the new noise reduction fan blade of the utility model Figure 2 .

[0017] Reference numerals: 1 - air inlet; 2 - air outlet; 3 - base; 31 - mounting hole; 4 - blade; 41 - wake flow spoiler structure; 411 - convex portion; 412 - concave portion. DETAILED DESCRIPTION

[0018] The following further illustrates the present invention with reference to the accompanying drawings and specific embodiments. However, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0019] See also Figure 1 and Figure 2 A high-speed fan comprises a novel noise-reducing fan blade, a rotating shaft, a stator assembly and a rotor assembly. The air inlet 1 of the novel noise-reducing fan blade faces outward, and the air outlet 2 of the novel noise-reducing fan blade faces the stator assembly. The novel noise-reducing fan blade is fixedly mounted on the rotating shaft through a mounting hole 31. The novel noise-reducing fan blade comprises a base 3 and a blade 4. The center line of the mounting hole 31 is the rotation axis of the base 3. The base 3 is a rotating body, which is a rotating body formed by a rotating surface formed by a parabola branch without a vertex rotating around the rotation axis of the base 3. The diameter of the base 3 increases from the air inlet 1 to the air outlet 2, and has a flow-guiding effect. The blade 4 is mounted on the base 3. The connecting line of the base surface formed by the blade 4 being mounted on the base 3 is an arc at a certain angle to the rotation axis of the base 3. The connecting line is evenly arranged around the rotation axis. In the direction perpendicular to the outer surface of the base 3, the blade end size of the air inlet 1 is larger than that of the outlet. The size of the blade end of the wind portion 2, that is, the width of the blade 4 gradually decreases along the wind direction. For the area of ​​the blade 4 perpendicular to the wind direction, the blade area at the air inlet 1 is larger than the blade area at the air outlet 2. According to Bernoulli's principle, the flow velocity of the fluid increases when it flows through the area with a smaller cross-section, which can effectively increase the fluid velocity; the blade end of the air outlet 2 is provided with a wake spoiler structure 41, and the wake spoiler structure 41 has at least one convex portion 411 and at least one concave portion 412 adjacent to the convex portion 411. Specifically, the wake spoiler structure 41 is serrated or wavy, and the tip protrusion can effectively improve the aerodynamic noise generated by the blade, reduce the noise frequency, and improve the use effect.

[0020] The above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many similar modifications are possible. All modifications that can be directly derived or imagined by a person skilled in the art from the disclosure of the present invention should be considered to be within the scope of protection of the present invention.

Claims

1. A novel noise reduction fan blade, wherein one end of the novel noise reduction fan blade is an air inlet portion (1) and the other end is an air outlet portion (2), and the novel noise reduction fan blade is characterized in that: The invention comprises a base (3) and a blade (4), wherein the base (3) has a mounting hole (31), the center line of the mounting hole (31) is the rotation axis of the base (3), the blade (4) is mounted on the base (3), the diameter of the base (3) increases from the air inlet (1) to the air outlet (2), and the end of the blade at the air outlet (2) is provided with a wake flow spoiler structure (41), and the wake flow spoiler structure (41) has at least one convex portion (411) and at least one concave portion (412) arranged adjacent to the convex portion (411).

2. The novel noise reduction fan blade according to claim 1, characterized in that: The base (3) is a rotating body, and the rotating body is a rotating body surrounded by a rotating surface formed by a parabola branch with the vertex removed rotating around the rotating axis of the base.

3. The novel noise reduction fan blade according to claim 1, characterized in that: In a direction perpendicular to the outer surface of the base (3), the size of the blade end of the air inlet portion (1) is larger than the size of the blade end of the air outlet portion (2).

4. The novel noise reduction fan blade according to claim 3, characterized in that: With respect to the area of ​​the blade (4) perpendicular to the wind direction, the blade area at the air inlet portion (1) is greater than the blade area at the air outlet portion (2).

5. The novel noise reduction fan blade according to claim 3, characterized in that: The connection line of the base surface formed by the blades (4) being installed on the base (3) is an arc forming a certain angle with the rotation axis of the base (3), and the connection line is evenly arranged around the rotation axis.

6. The novel noise reduction fan blade according to claim 1, characterized in that: The wake flow spoiler structure (41) is serrated.

7. The novel noise reduction fan blade according to claim 1, characterized in that: The wake spoiler structure (41) is wavy.

8. A high-speed fan, characterized in that: The novel noise reduction fan blade comprises a novel noise reduction fan blade as described in any one of claims 1 to 7, a rotating shaft, a stator assembly and a rotor assembly, wherein the air outlet of the novel noise reduction fan blade faces the stator assembly, and the novel noise reduction fan blade is fixedly mounted on the rotating shaft through the mounting hole (31).

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