Low-noise fan

Abstract

The low-noise fan comprises a mounting frame, a mounting plate is connected to the rear side of the mounting frame through a tripod, a mounting cylinder is arranged on the front side of the mounting plate, a wind shaft is clamped in the mounting cylinder, and a plurality of fan blades are mounted on the front side of the wind shaft through a concentrating cylinder; the fan blades are hollow, and arc sawteeth are arranged on the outer sides of the fan blades. The number of the fan blades is seven, and the fan blades are non-equidistantly distributed. According to the utility model, the convex sponge gasket is arranged, so that the sponge gasket is pressed to be positioned between the mounting frame and the mounting surface, and vibration energy is absorbed through the soft material of the sponge gasket, so that the resonance phenomenon between the mounting frame and the mounting surface is reduced, and the noise reduction effect is achieved; the fan blades are designed to have irregular intervals, and the discrete frequency which originally generates strong noise is dispersed into a wider frequency band, so that the perception degree of human ears to the noise is reduced, and the effect of indirect noise reduction is achieved; the fan blades are designed to be hollow, disturbance of airflow on the surfaces of the fan blades is reduced, and therefore noise generated by airflow disturbance is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of fan technology, specifically relating to a low-noise fan. Background Technology

[0002] Existing computer case fans typically employ a high-speed, high-airflow design to ensure that heat inside the case can be dissipated in a timely manner. However, such designs overemphasize the cooling function of the fan and neglect its significant noise problem. Especially when running large games or high-load software, the fan speed will increase further, and the noise will also increase. Being in a high-noise environment for a long time may cause users to feel irritable, anxious, and even affect their sleep quality, resulting in a poor user experience. Utility Model Content

[0003] The purpose of this invention is to provide a low-noise fan to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a low-noise fan, including a mounting frame, a mounting plate connected to the rear side of the mounting frame via a tripod, a mounting cylinder provided on the front side of the mounting plate, a fan shaft being snapped into the mounting cylinder, and multiple fan blades being mounted on the front side of the fan shaft via a central cylinder.

[0005] Preferably, the fan blade is hollow, and the outer side of the fan blade is provided with arc-shaped serrations.

[0006] Preferably, the number of fan blades is 7, and they are distributed at non-equidistant intervals.

[0007] Preferably, the wind shaft is mounted and snapped into place inside the mounting cylinder by a bucket-shaped spring.

[0008] Preferably, the mounting frame has mounting holes at all four corners, and a vibration damping groove is provided on the rear side of the mounting hole, with a sponge gasket inside the vibration damping groove.

[0009] Preferably, the vibration damping groove extends inward and is provided with a pressure relief groove.

[0010] Preferably, the fan blades and the concentrator are integrally formed.

[0011] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention uses a protruding sponge washer, which is pressed between the mounting frame and the mounting surface. The soft material of the washer absorbs vibration energy, thereby reducing resonance and achieving noise reduction. Furthermore, the fan blades are designed with irregular spacing, dispersing the discrete frequencies that originally generated strong noise into a wider frequency band, thus reducing the perceived noise and achieving indirect noise reduction. The fan blades are also designed to be hollow, reducing airflow disturbance on the blade surface and thus reducing noise generated by airflow disturbance. Finally, by mimicking the shape of bird wings, the fan blades have arc-shaped serrations on their outer surface, allowing for more effective control of airflow during rotation and altering the aerodynamic characteristics of the blades, thereby achieving noise reduction. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0013] Figure 2 This is an exploded view of the present invention;

[0014] Figure 3 This is a three-dimensional structural diagram of the fan blade in this utility model;

[0015] Figure 4 This is a three-dimensional structural diagram of the mounting frame and sponge pad in this utility model.

[0016] The numbers in the diagram are: 1-Mounting frame, 2-Tripod, 4-Mounting plate, 5-Mounting cylinder, 6-Wind shaft, 7-Concentrating cylinder, 8-Fan blade, 801-Circular arc sawtooth, 9-Bucket spring, 10-Mounting hole, 11-Vibration damping groove, 12-Sponge washer, 13-Pressure relief groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1

[0019] like Figures 1 to 4The low-noise fan shown includes a mounting frame 1. A mounting plate 4 is connected to the rear of the mounting frame 1 via a tripod 2. A mounting cylinder 5 is provided on the front of the mounting plate 4. A fan shaft 6 is snapped into the mounting cylinder 5. Multiple fan blades 8 are mounted on the front of the fan shaft 6 via a concentrator 7. The fan blades 8 are hollow and have arc-shaped serrations 801 on their outer sides. There are 7 fan blades 8, which are distributed non-equidistantly. The fan shaft 6 is snapped into the mounting cylinder 5 via a bucket-shaped spring 9. Mounting holes 10 are provided at all four corners of the mounting frame 1. Vibration damping grooves 11 are provided outwardly on the rear side of the mounting holes 10. Sponge gaskets 12 are provided in the vibration damping grooves 11. Pressure relief grooves 13 are provided inwardly on the vibration damping grooves 11. The fan blades 8 and the concentrator 7 are integrally formed.

[0020] This invention utilizes a protruding sponge washer 12, which is pressed between the mounting frame 1 and the mounting surface. The soft material of the washer absorbs vibration energy, reducing resonance and thus noise reduction. The fan blades 8 are designed with irregular spacing, dispersing the discrete frequencies that originally generated strong noise across a wider frequency band, thereby reducing the perceived noise and achieving indirect noise reduction. Furthermore, the fan blades 8 are designed to be hollow, reducing airflow disturbance on their surface and thus lowering noise generated by airflow disturbance. Finally, mimicking the shape of a bird's wing, the fan blades 8 have arc-shaped serrations 801 on their outer side, allowing for more effective control of airflow during rotation and altering their aerodynamic characteristics, thereby achieving noise reduction.

[0021] Example 2

[0022] like Figures 1 to 4 The low-noise fan shown includes a mounting frame 1. The mounting frame 1 can be set according to the actual installation position, and is commonly circular or square. In this embodiment, the mounting frame 1 is set as square, forming at least four mounting points with the mounting surface to ensure stable installation between it and the mounting surface. This avoids the vibration force generated by the internal fan blades 8 during operation, which would cause the mounting frame 1 to continuously contact and collide with the mounting surface, generating noise. At the same time, mounting holes 10, i.e., mounting points, are opened at the four corners of the mounting frame 1. The mounting frame 1 and the mounting surface can be installed in the mounting holes 10 using fasteners such as bolts. The rear side of the mounting holes 10 expands outward in a circular shape with a vibration damping groove 11. A sponge washer 12 is placed in the vibration damping groove 11, and the sponge washer 12 protrudes from the highest point of the vibration damping groove 11. After the mounting frame 1 is installed, the bolts are located in the sponge washer 12. At this time, the sponge washer 12 is compressed between the mounting frame 1 and the mounting surface. Through its own soft material, it absorbs vibration energy, thereby reducing the resonance phenomenon between the two and achieving the effect of noise reduction.

[0023] Furthermore, a pressure relief groove 13 is provided extending inward from the vibration damping groove 11. The pressure relief groove 13 is strip-shaped, meaning that the pressure relief groove 13 can receive some of the vibration energy that the sponge pad cannot absorb, and provides an additional release channel for the vibration energy, which can help reduce resonance again and achieve the effect of reducing noise.

[0024] Example 3

[0025] like Figures 1 to 4 The low-noise fan shown has a mounting plate 4 connected to the rear of the mounting frame 1 via a tripod 2. The tripod 2 consists of three inwardly extending connecting rods, forming a circular space inside for mounting the circular mounting plate 4. A mounting cylinder 5 is located on the front of the mounting plate 4. The mounting cylinder 5 is cylindrical, and a fan blade 8 is connected inside it via a snap-fit ​​fan shaft 6. When the fan blade 8 rotates, it drives the fan shaft 6 to rotate within the mounting cylinder 5 without moving back and forth, thus securing the fan blade 8. A bucket-shaped spring 9 is also installed inside the mounting cylinder 5. The bucket-shaped spring 9, in conjunction with the fan shaft 6, buffers the vibration generated by the fan shaft 6 during high-speed rotation, dispersing noise energy across a wider frequency band and effectively reducing noise caused by vibration.

[0026] It is important to note that multiple fan blades 8 are mounted on the front side of the fan shaft 6 via a concentrator 7. The fan blades 8 and the concentrator 7 are integrally molded to ensure the stability of the fan blades 8 during rotation. While there are multiple fan blades 8, their spacing is not uniform. Figure 1 As shown, in this embodiment, there are 7 fan blades 8. Specifically, it can be understood as follows: 8 fan blades 8 with the same spacing have 8 spacings, and the spacing value is Z = outer diameter of the concentrator 7 / 8. Then, one of the fan blades 8 is cut off, resulting in 7 spacings, of which 6 spacings are still Z / 8, and the remaining spacing is Z / 4; and so on.

[0027] Conventional fan blades 8 are designed with equal spacing, but in this embodiment, for the purpose of noise reduction, the fan blades 8 are designed with irregular spacing. That is, the obvious sound energy peaks that may be generated in a fan with equal spacing fan blades 8 will be dispersed to a wider frequency range in the fan blades with unequal spacing. The discrete frequencies that originally generated strong noise are dispersed to a wider frequency band, thereby reducing the degree of noise perception by the human ear.

[0028] Example 4

[0029] like Figures 1 to 4The low-noise fan shown has multiple blades 8. In this embodiment, the blades 8 are designed to be hollow to reduce airflow disturbance on the surface of the blades 8, thereby reducing noise generated by airflow disturbance. Moreover, based on the asymmetrical blades 8, this embodiment designs the blades 8 in the shape of bird wings, specifically with arc-shaped serrations 801 on the outer side of the blades 8. By imitating this shape, the concentrated vortices generated at the edge of the blades when sweeping air are effectively segmented and broken into multiple smaller and weaker micro-vortices, thereby significantly reducing the aerodynamic noise generated by vortex shedding and breaking. This allows the blades 8 to more effectively control the airflow when rotating, changing the aerodynamic characteristics of the blades 8, thereby achieving the effect of noise reduction.

[0030] In addition, other special forms of birds can be used:

[0031] The owl-inspired blade, mimicking the shape of an owl's wing, is designed with a biomimetic blade model fitted by a mid-arc line and a thickness curve, which can effectively suppress eddy noise in practical applications.

[0032] Striped blade structure: By studying the wing airfoil characteristics of the long-eared owl, a striped structure fan blade with 8 blades was designed, and the trailing edge of the blade has a toothed structure with a certain angle. In practical applications, it can effectively reduce the noise performance of the fan; etc.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A low-noise fan, comprising a mounting frame (1), characterized in that, The mounting frame (1) is connected to a mounting plate (4) via a tripod (2) on the rear side. The mounting plate (4) is provided with a mounting cylinder (5) on the front side. A wind shaft (6) is snapped into the mounting cylinder (5). Multiple fan blades (8) are installed on the front side of the wind shaft (6) via a central cylinder (7). The fan blades (8) are hollow, and the outer side of the fan blades (8) is provided with arc-shaped serrations (801).

2. A low-noise fan according to claim 1, characterized in that, The number of fan blades (8) is 7, and they are distributed at non-equidistant intervals.

3. A low-noise fan according to claim 1, characterized in that, The wind shaft (6) is installed and clamped inside the mounting cylinder (5) by a bucket-shaped spring (9).

4. A low-noise fan according to claim 1, characterized in that, The mounting frame (1) has mounting holes (10) at all four corners. The mounting holes (10) are provided with vibration damping grooves (11) that expand outward from the rear side. The vibration damping grooves (11) are provided with sponge gaskets (12).

5. A low-noise fan according to claim 4, characterized in that, The vibration damping groove (11) extends inward and is provided with a pressure relief groove (13).

6. A low-noise fan according to claim 1, characterized in that, The fan blade (8) and the concentrator (7) are integrally formed.

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