A low-noise fan with trailing edge serrated blades

Abstract

The utility model provides a low-noise fan with a trailing edge serrated blade, which relates to the technical field of fans, including a frame and a connector, wherein the top of the frame is provided with air intake steps near the four corners, the top of the frame is provided with a plurality of air guide blades equidistantly, and the outer surface of the connector is evenly and fixedly connected with a plurality of blades. The utility model, when the blades are rotating, the air intake steps are provided to facilitate the acceleration of the airflow of the intake from laminar flow to turbulent flow, so that the blades can inhale more air when they are running, and improve the airflow efficiency. The sawtooth designed at the tail of the blade can reduce the airflow pulsation intensity in the wake area of ​​the blade, and the arc chamfer between the blade tip and the inner wall of the frame can prevent the generation of high-frequency noise. After the airflow contacts the blade, the airflow is discharged from the casing, and the airflow will flow through the air guide blades provided at the diffuser at the bottom of the frame when discharged, thereby changing the angle of the airflow and blowing it out, thereby reducing the noise.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a low-noise fan with trailing edge sawtooth fan blades. Background Art

[0002] Fans are usually used in the cooling system of computers or electronic equipment to provide air cooling. The sizes of these fans are usually marked in millimeters, such as 80mm, 120mm, 140mm, etc. The size of the chassis fan should be determined according to the size and space of the chassis.

[0003] Existing conventional-sized fans have high noise levels and a wide noise frequency distribution range while ensuring air volume and air pressure performance. When a large number of fans are installed in a chassis, resonance frequencies will be caused, making it difficult to estimate the resonance frequency of the entire chassis, resulting in a high noise level for the entire machine.

[0004] Therefore, it is necessary to propose a novel low-noise fan with a trailing edge serrated blade. Utility Model Content

[0005] The utility model mainly provides a low-noise fan with trailing edge sawtooth blades which can reduce noise and blade resonance.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a low-noise fan with trailing-edge serrated blades, comprising a frame and a connector, the top of the frame is provided with air intake steps near the four corners, the top of the frame is provided with a plurality of air guide blades equidistantly arranged, the outer surface of the connector is evenly and fixedly connected with a plurality of blades, the tails of the plurality of blades are provided with serrations, and the bottom of the connector is evenly provided with a plurality of dynamic balancing grooves.

[0007] Preferably, the number of the dynamic balancing grooves is set to 21, and the number of layers of the air intake steps is set to 6. The dynamic balancing grooves on the connecting head are set to facilitate dynamic balancing of the filler at different angles, and can also reduce the weight of the blades and reduce operating power consumption. The 6 layers of air intake steps set on the frame can accelerate the air intake airflow from laminar flow to turbulent flow, so that the blades can inhale more air when running, improve airflow efficiency, and improve high-frequency noise.

[0008] Preferably, the trailing edges of the plurality of blades are rounded, and the leading edges of the blade tips of the plurality of blades are rounded. By providing larger rounded corners at the leading and trailing edges of the blade tips, the passage of airflow is facilitated and noise is reduced.

[0009] Preferably, a fixing frame is fixedly connected to the inner surface of the frame near the bottom, and a driving assembly is arranged at the top center of the fixing frame. The driving assembly can be installed by the setting of the fixing frame.

[0010] Preferably, the output end of the driving assembly is fixedly connected to the top of the connector, and the driving assembly can provide power to the connector to rotate the blades.

[0011] Preferably, the tooth width of the plurality of saw teeth is 1.39 mm, the tooth height is 1.62 mm, and the number of the blades is set to 7. Through the setting of the saw teeth, the single-tone peak noise can be reduced by 40 dB.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are:

[0013] 1. In the utility model, when the blades are rotating, the air intake step is arranged to accelerate the airflow of the intake from laminar flow to turbulent flow, so that the blades can inhale more air when running, and the airflow efficiency is improved. The sawtooth designed at the tail of the blade can reduce the airflow pulsation intensity in the wake area of ​​the blade. At the same time, the arc chamfer between the tip of the blade and the inner wall of the frame can prevent the generation of high-frequency noise. After the airflow contacts the blade, the airflow is discharged from the casing. When discharged, the airflow will flow through the guide vanes arranged at the diffuser at the bottom of the frame, thereby changing the angle of the airflow and blowing it out, thereby reducing the noise of the whole machine.

[0014] 2. In the utility model, the dynamic balancing groove provided at the bottom of the connector not only facilitates dynamic balancing of the filling at different angles, but also reduces the weight of the blades, reduces the operating power consumption, and reduces the resonance in the blades during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of a low-noise fan with a trailing-edge serrated blade is provided for the utility model;

[0016] Figure 2 The utility model provides a bottom schematic diagram of a low-noise fan with a trailing edge serrated fan blade;

[0017] Figure 3 The utility model provides a partial structural development diagram of a low-noise fan with a trailing edge serrated fan blade;

[0018] Figure 4 The utility model provides a blade structure schematic diagram of a low-noise fan with a trailing edge serrated fan blade.

[0019] Legend: 1. Frame; 2. Air intake step; 3. Fixed frame; 4. Blades; 5. Connector; 6. Sawtooth; 7. Guide vane; 8. Drive assembly; 9. Dynamic balancing groove. DETAILED DESCRIPTION

[0020] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0022] See also Figure 1-Figure 4 The utility model provides a technical solution: a low-noise fan with a trailing edge serrated fan blade, comprising a frame 1 and a connector 5, an air intake step 2 is arranged near the four corners of the top of the frame 1, a plurality of air guide blades 7 are arranged equidistantly on the top of the frame 1, a plurality of blades 4 are evenly fixedly connected to the outer surface of the connector 5, a plurality of blades 4 are arranged at the tails of the plurality of blades 4, and a plurality of dynamic balancing grooves 9 are evenly opened at the bottom of the connector 5.

[0023] like Figure 1 , Figure 3 and Figure 4 As shown, the number of dynamic balancing grooves 9 is set to 21, and the number of layers of the air intake steps 2 is set to 6. The dynamic balancing grooves 9 on the connecting head 5 are set to facilitate dynamic balancing of the filler at different angles, and the weight of the connecting head 5 can be reduced, and the operating power consumption can be reduced. The 6 layers of air intake steps 2 set on the frame 1 can facilitate the acceleration of the air intake airflow from laminar flow to turbulent flow, so that the blades 4 can inhale more air when running, improve the airflow efficiency, and improve the high-frequency noise.

[0024] like Figure 1-Figure 4 As shown, the trailing edges of multiple blades 4 are all rounded, and the leading edges of the blade tips of multiple blades 4 are all rounded. By introducing larger rounded corners at the leading and trailing edges of the blade tips of the blades 4, the passage of airflow is facilitated and noise is reduced.

[0025] like Figure 1-Figure 3 As shown, a fixing frame 3 is fixedly connected to the inner surface of the frame 1 near the bottom, and a driving assembly 8 is arranged at the top center of the fixing frame 3. The driving assembly 8 can be installed through the arrangement of the fixing frame 3.

[0026] like Figure 1-Figure 3 As shown, the output end of the driving assembly 8 is fixedly connected to the top of the connector 5, and the driving assembly 8 can provide power to the connector 5 to rotate the blades 4.

[0027] like Figure 1-Figure 4As shown, the tooth width of the plurality of saw teeth 6 is 1.39 mm, the tooth height is 1.62 mm, and the number of blades 4 is set to 7. Through the setting of the saw teeth 6, the single-tone peak noise can be reduced by 40 dB.

[0028] The use method and working principle of this device: the blade 4 is made of PA66+30GF, which is a nylon material with glass fiber to increase toughness. It is heat-resistant and deformed above 260°C, corrosion-resistant, and has a smooth surface. It is particularly suitable for ships and other ocean environments, and is salt-fog-proof, acid-proof, and alkali-proof. The blade 4 and the connector 5 are integrally molded by a mold. When the connector 5 and the blade 4 are rotated by the driving component 8, the 21 dynamic balancing grooves 9 set at the bottom of the connector 5 are convenient for dynamic balancing compensation at different angles, and can also reduce the weight of the connector 5, reduce the operating power consumption, and reduce the resonance frequency through dynamic balancing compensation. The six-layer air intake step 2 designed on the air intake on the front side of the frame 1 facilitates the acceleration of the airflow from laminar flow to turbulent flow, so that the blades 4 can inhale more air when running, improve the airflow efficiency, and improve the high-frequency noise. The setting of the guide blade 7 at the air outlet at the bottom of the frame 1 can make the airflow be evenly dispersed when passing through the back diffuser, thereby avoiding the high-frequency noise generated by the laminar flow. By controlling the gap between the blade 4 and the frame 1, the gap between the blade 4 and the frame 1 is avoided to be small, so as to avoid the generation of high-frequency sharp noise during operation. At the same time, larger fillets are provided at the leading edge and trailing edge of the blade tip of the blade 4 to facilitate the passage of airflow and reduce noise.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A low-noise fan with a trailing-edge sawtooth fan blade, comprising a frame (1) and a connector (5), characterized in that: Air intake steps (2) are arranged near the four corners of the top of the frame (1), a plurality of air guide blades (7) are arranged at equal intervals on the top of the frame (1), a plurality of blades (4) are evenly fixedly connected to the outer surface of the connector (5), a plurality of blades (4) are arranged at the tails of the plurality of blades (4), and a plurality of dynamic balancing grooves (9) are evenly arranged on the bottom of the connector (5).

2. The low-noise fan with trailing-edge serrated blades according to claim 1, characterized in that: The number of the dynamic balancing grooves (9) is set to 21, and the number of the air intake steps (2) is set to 6.

3. The low noise fan with trailing edge serrated blades according to claim 2, characterized in that: The trailing edges of the plurality of blades (4) are all rounded, and the leading edges of the blade tips of the plurality of blades (4) are all rounded.

4. The low-noise fan with trailing-edge sawtooth blades according to claim 3, characterized in that: A fixing frame (3) is fixedly connected to the inner surface of the frame (1) near the bottom, and a driving assembly (8) is arranged at the top center of the fixing frame (3).

5. The low noise fan with trailing edge sawtooth blades according to claim 4, characterized in that: The output end of the driving component (8) is fixedly connected to the top of the connector (5).

6. The low-noise fan with trailing-edge sawtooth blades according to claim 5, characterized in that: The tooth width of the plurality of saw teeth (6) is 1.39 mm, the tooth height is 1.62 mm, and the number of the blades (4) is set to 7.

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