Large-air-volume double fan blade and fan

Abstract

The utility model relates to the technical field of heat dissipation fan design, in particular to a large-air-volume double fan blade and a fan, the large-air-volume double fan blade comprises an axis part, fan blades and an outer ring, and is characterized in that the two groups of fan blades are respectively large fan blades and small fan blades; the large fan blades are connected with the axis part and the outer ring, and the small fan blades are located on the inner side of the outer ring. Through the arrangement of the large fan blades and the small fan blades, the number of the blades is increased under the condition that the air inlet area is not affected, so that the air volume is increased; in addition, noise is reduced through secondary blowing of the small fan blades after air is discharged from the large fan blades, and the noise is reduced while the air volume is increased through the design of the large fan blades and the small fan blades.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation fan design, and particularly relates to a large-air-volume double fan blade and a fan. Background Art

[0002] With the rapid development of technologies such as electronic devices, industrial machinery, and data centers, the heat generated during their operation has increased sharply. In order to ensure that the devices operate within an appropriate temperature range and prevent performance degradation, damage, or even safety accidents caused by overheating. It is usually necessary to improve the heat dissipation efficiency to protect the safety of the devices, extend their service life, and at the same time enhance the system stability and reliability, and ensure data security and business continuity.

[0003] In the prior art, high-efficiency heat dissipation is usually achieved by designing fan blades with a large air volume. When designing fan blades with a large air volume, a common strategy is to adopt a scheme in which multiple blades are evenly distributed, aiming to increase the air delivery volume and air pressure of the fan by increasing the number of blades. However, this scheme also comes with a significant challenge: the increase in the number of blades will inevitably reduce the air intake area of the fan blade. Too many blades will be closely arranged, resulting in a narrow air flow channel, thereby restricting the air intake efficiency of the fan. Summary of the Utility Model

[0004] Therefore, the purpose of this application is to solve the technical problem in the prior art that the large-air-volume fan blade affects the air intake area due to too many blades.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] A large-air-volume double fan blade, including an axis part, fan blades, and an outer ring, characterized in that: there are two groups of the fan blades, and the two groups of the fan blades are a large fan blade and a small fan blade respectively. The large fan blade is connected to the axis part and the outer ring, and the small fan blade is located inside the outer ring.

[0007] Preferably, the large fan blades are circumferentially arrayed between the axis part and the outer ring. One end of the large fan blade is fixed to the outer peripheral wall of the axis part, and the other end thereof is fixedly connected to the inner side wall of the outer ring.

[0008] Preferably, the number of the small fan blades is the same as that of the large fan blades, and each small fan blade is respectively arranged between adjacent large fan blades.

[0009] Preferably, the large fan blades are inclined and are arc-shaped; the small fan blades are arc-shaped, and the radian direction of the small fan blades is the same as that of the large fan blades.

[0010] Preferably, the projection of the large fan blade in the horizontal direction consists of two trapezoidal parts. The bottom sides of the longer sides of the two trapezoidal parts overlap, and the two trapezoidal parts extend towards the central axis part and the inner wall of the outer ring respectively. The height of the trapezoidal part pointing to the inner wall of the outer ring is less than the height of the other trapezoidal part.

[0011] Preferably, the small fan blade is trapezoidal in the horizontal direction.

[0012] Preferably, the two waist sides of the projection of the small fan blade in the horizontal direction are parallel to the waist sides of the trapezoidal part of the large fan blade pointing to the inner wall of the outer ring.

[0013] The present application also provides a fan, including the large-air-volume double fan blade described above.

[0014] For the above-mentioned large-air-volume double fan blade, through the arrangement of the large fan blade and the small fan blade, the number of blades is increased without affecting the air intake area to increase the air volume; in addition, after the large fan blade discharges air, the small fan blade blows the air again to reduce the noise. Through the design of the large fan blade and the small fan blade, the air volume is increased while the noise is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the large-air-volume double fan blade in an embodiment of the present utility model;

[0016] Figure 2 It is a schematic diagram of the overall structure of the large-air-volume double fan blade from another angle in an embodiment of the present utility model;

[0017] Figure 3 It is a cross-sectional schematic diagram of the large-air-volume double fan blade in an embodiment of the present utility model.

[0018] In the figure, 1 is the central axis part; 2 is the large fan blade; 3 is the small fan blade; 4 is the outer ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further describes the present utility model in detail with reference to the accompanying drawings and embodiments.

[0020] Please refer to Figure 1 , a large-air-volume double fan blade, including a central axis part 1, fan blades and an outer ring 4. Among them, the central axis part 1 is generally cylindrical, the outer ring 4 is arranged around the outer circumference of the central axis part 1, the outer ring 4 is circular ring-shaped and is coaxially arranged with the central axis part 1; there are two groups of fan blades, and the two groups of fan blades are respectively a large fan blade 2 and a small fan blade 3. The large fan blade 2 and the small fan blade 3 are both arranged in a circumferential array along the outer circumference of the central axis part 1. Among them, the large fan blade 2 is connected to the central axis part 1 and the outer ring 4, and the small fan blade 3 is located inside the outer ring 4.

[0021] Please refer to Figure 1 and Figure 2 , in one embodiment, the shaft center part 1 is arranged in a circle and is located at the center position of the double fan blades. The shaft center part 1 is used for being sleeved on a stator.

[0022] Please refer to Figure 1 and Figure 2 , the large fan blades 2 are arranged in a circumferential array between the shaft center part 1 and the outer ring 4; in one embodiment, the number of the large fan blades 2 is set to be 11. Please refer to Figure 3 , one end of each large fan blade 2 is fixed on the outer peripheral wall of the shaft center part 1, and the other end thereof is fixedly connected to the inner side wall of the outer ring 4; in one embodiment, the large fan blades 2 are inclined, and the large fan blades 2 are arc-shaped. Please refer to Figure 1 and Figure 2 , in one embodiment, the projection of the large fan blade 2 in the horizontal direction is composed of two trapezoidal parts. The longer bottom sides of the two trapezoidal parts overlap, and the two trapezoidal parts extend towards the shaft center part 1 and the inner wall of the outer ring 4 respectively. The height of the trapezoidal part pointing to the inner wall of the outer ring 4 is less than the height of the other trapezoidal part. In one embodiment, the height of the trapezoidal part pointing to the inner wall of the outer ring 4 is about 1 / 2 of the height of the other trapezoidal part. In other embodiments, the number of the large fan blades 2 can be increased or decreased according to requirements, and the shape of the large fan blades 2 can also be replaced according to requirements.

[0023] Please refer to Figure 1 and Figure 2 , the number of the small fan blades 3 is the same as that of the large fan blades 2, and each small fan blade 3 is respectively arranged between adjacent large fan blades 2; in one embodiment, the small fan blades 3 are arc-shaped, and the radian direction of the small fan blades 3 is the same as that of the large fan blades 2.

[0024] Please refer to Figure 1 , the small fan blades 3 are trapezoidal in the horizontal direction. In one embodiment, the two waist sides of the projection of the small fan blades 3 in the horizontal direction are parallel to the waist sides of the trapezoidal part of the large fan blades 2 pointing to the inner wall of the outer ring 4.

[0025] Please refer to Figure 1 , the outer ring 4 is circularly arranged. In one embodiment, the outer ring 4 is arranged at the same height as the shaft center part 1.

[0026] The present application also provides a fan, which includes the double blades, a frame and a stator described above. Among them, the double blades are arranged as a rotor, the frame is square-shaped, and a circular channel arranged vertically is provided in the middle of the frame. The stator is located at the central position of the circular channel. In one embodiment, the stator includes a shaft sleeve, upper magnetic pole pieces, lower magnetic pole pieces, a coil, a circuit board, etc.

[0027] The double blades are sleeved on the stator through the central part 1.

[0028] A large-airflow double blade provided by the present application, through the combination of the large blade 2 and the small blade 3, solves the problem of limited air intake area caused by too many blades in the traditional multi-blade solution, and also significantly improves the air volume by increasing the number of blades, achieving a leap in heat dissipation efficiency. Among them, the large blade 2 is the main air pusher, and its design focuses on providing a wide air intake area to ensure that enough air is inhaled into the fan. At the same time, its optimized blade shape and curvature effectively reduce the resistance of air flow, enabling the air flow to pass through smoothly and accelerate the discharge, thus achieving the goal of large air volume.

[0029] The small blade 3 is used for secondary air blowing and noise reduction. The small blade 3 is located between the large blades. Through precise design and layout, it can not only further accelerate the air flow without additional occupation of the air intake area, realizing a secondary increase in air volume; more importantly, the small blade 3 can effectively disperse the turbulence and vortices generated by the large blade 2, reducing the noise sources in air flow, so that the entire fan system not only increases the air volume but also significantly reduces the noise.

Claims

1. A large air volume double blade fan, comprising an axis, blades and an outer ring, characterized in that: The fan blades are provided in two groups, and the two groups of fan blades are respectively large fan blades and small fan blades. The large fan blades are connected to the axis part and the outer ring, and the small fan blades are located on the inner side of the outer ring.

2. A large air volume double blade fan according to claim 1, characterized in that: The large fan blade circular array is between the axial portion and the outer ring, one end of the large fan blade is fixed to the outer peripheral wall of the axial portion, and the other end is connected and fixed to the inner wall of the outer ring.

3. A large air volume double blade fan according to claim 2, characterized in that: The number of the small fan blades is the same as that of the large fan blades, and each of the small fan blades is arranged between adjacent large fan blades.

4. A large air volume double blade fan according to claim 3, characterized in that: The large fan blades are arranged obliquely, and are arranged in an arc shape; the small fan blades are arranged in an arc shape, and the arc direction of the small fan blades is consistent with that of the large fan blades.

5. A large air volume double blade fan according to claim 4, characterized in that: The horizontal projection of the large fan blade consists of two trapezoidal parts, the base edges of the longer sides of the two trapezoidal parts are overlapped, and the two trapezoidal parts extend toward the axial part and the inner wall of the outer ring respectively, and the height of the trapezoidal part pointing to one side of the inner wall of the outer ring is smaller than the height of the trapezoidal part on the other side.

6. A large air volume double blade fan according to claim 5, characterized in that: The small fan blades are arranged in a trapezoidal shape in the horizontal direction.

7. A large air volume double blade fan according to claim 6, characterized in that: The two waist edges projected in the horizontal direction of the small fan blade and the waist edge of the trapezoidal portion of the large fan blade pointing to one side of the inner wall of the outer ring are arranged parallel to each other.

8. A fan, characterized in that: It comprises the large air volume double blades as described in any one of claims 1-7.

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