Large-air-volume dustproof fan structure with gurney flap

Abstract

The invention relates to the technical field of direct-current fans, and discloses a large-air-volume dustproof fan structure with gurney flaps, the large-air-volume dustproof fan structure comprises a shell assembly, a rotor assembly and a stator assembly, the rotor assembly comprises a rotor shaft, a rotor sleeve, magnetic steel and rotor blades, the gurney flaps are arranged on the rotor blades, and the gurney flaps are arranged on the rotor shaft. The gurney flap is of a protruding structure vertically arranged along the rear edge of a fan blade of the rotor blade. According to the invention, the gurney flaps are additionally arranged on the rotor blades of the fan, so that the fan can more effectively guide airflow and reduce eddy current loss during operation, the efficiency and the air volume of the fan are improved, the airflow characteristic index of the fan is remarkably improved, the hysteresis effect of an oscillating airfoil aerodynamic load can be effectively reduced, and the service life of the fan is prolonged. And noise generated during operation of the fan is reduced, so that the acoustic characteristic of the fan is improved.

Description

Technical Field

[0001] The invention relates to the technical field of direct current fans and discloses a large air volume dust-proof fan structure with a Gurney flap. Background Art

[0002] Compared with AC fans, DC fans have the advantages of high efficiency, large air volume and pressure, and the ability to increase circuit control, and are widely used in various military fields. Due to the particularity of military products, higher requirements are placed on the reliability, airflow characteristics, and noise indicators of fans. Summary of the invention

[0003] The object of the present invention is to provide a large-volume dust-proof fan structure with a Gurney flap, which can reduce eddy current losses, thereby improving the efficiency and air volume of the fan, and significantly improving the airflow characteristic indicators of the fan; it can also effectively reduce the hysteresis effect of the oscillating airfoil aerodynamic load, reduce the noise generated when the fan is running, thereby improving the acoustic characteristics of the fan.

[0004] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0005] A large air volume dust-proof fan structure with a Gurney flap, comprising:

[0006] Shell assembly;

[0007] A rotor assembly, the rotor assembly comprising a rotor shaft, a rotor sleeve, a magnetic steel and a rotor blade, the rotor shaft being mounted on a housing assembly of a fan structure through a bearing, the rotor sleeve and the rotor blade being coaxially mounted on the rotor shaft, the magnetic steel being fixed in the rotor sleeve, and the rotor blade being provided with a Gurney flap, the Gurney flap being a protruding structure vertically arranged along the trailing edge of the rotor blade;

[0008] The stator assembly is fixedly installed in the housing assembly, and the stator assembly is coaxially matched with the magnetic steel.

[0009] Furthermore, an annular extension portion is provided on the rotor assembly, and the extension portion is arranged near the root of the rotor blade, and the extension portion is coaxially arranged with the rotor shaft. The extension portion extends axially to a position where it is gap-matched with the inner wall of the shell assembly, so that the rotor assembly and the shell assembly are enclosed to form a dustproof isolation zone.

[0010] Furthermore, the rotor sleeve is provided with weight-reducing holes.

[0011] Furthermore, a dynamic balancing slot is provided on the rotor blade, and the dynamic balancing slot is used for inserting a dynamic balancing adjustment sheet.

[0012] Furthermore, the installation angle of the rotor blade ranges from 29° to 33°, and the installation angle is the angle between the outer chord line of the blade profile at the root of the rotor blade and the blade front line.

[0013] Furthermore, the magnetic steel is fixedly installed in the rotor sleeve, and the rotor sleeve is provided with a magnetic steel limiting assembly at an installation position corresponding to the magnetic steel.

[0014] Furthermore, it also includes an end cover, on which a shaft sleeve is fixedly mounted, the shaft sleeve extends into the inner cavity of the rotor sleeve, and the bearing is mounted in the shaft sleeve.

[0015] Furthermore, the stator assembly is fixedly sleeved on the outer wall of the shaft sleeve, and an anti-rotation keyway is provided between the stator assembly and the shaft sleeve.

[0016] Compared with the prior art, the present invention has the following beneficial effects: by adding Gurney flaps to the fan rotor blades, the fan can more effectively guide the airflow and reduce eddy losses during operation, thereby improving the efficiency and air volume of the fan, significantly improving the airflow characteristic indicators of the fan, and effectively reducing the lag effect of the oscillating airfoil aerodynamic load, reducing the noise generated when the fan is running, thereby improving the acoustic characteristics of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of a large air volume dust-proof fan with a Gurney flap in an embodiment;

[0018] Figure 2 Schematic diagram of the structure of the rotor assembly in the embodiment;

[0019] Figure 3 It is a schematic diagram of the structure of the rotor sleeve in the embodiment;

[0020] Figure 4 Schematic diagram of the installation angle of the rotor blades in the embodiment;

[0021] Figure 5 Schematic diagram of the shaft sleeve and anti-rotation keyway structure in the embodiment;

[0022] Among them, 1. Shell assembly; 2. Rotor shaft; 3. Rotor sleeve; 4. Magnet; 5. Rotor blade; 6. Gurney flap; 7. Stator assembly; 8. Extension; 9. Dust isolation area; 10. Weight reduction hole; 11. Dynamic balancing slot; 12. Dynamic balancing adjustment plate; 13. End cover; 14. Bushing; 15. Anti-rotation keyway; 16. Bearing. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the embodiments and drawings. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0024] Example

[0025] See also Figure 1-Figure 5 , a large air volume dust-proof fan structure with a Gurney flap, comprising:

[0026] Shell assembly 1;

[0027] A rotor assembly, the rotor assembly comprising a rotor shaft 2, a rotor sleeve 3, a magnetic steel 4 and a rotor blade 5, the rotor shaft 2 being mounted on a housing assembly 1 of a fan structure via a bearing 16, the rotor sleeve 3 and the rotor blade 5 being coaxially mounted on the rotor shaft 2, the magnetic steel 4 being fixed in the rotor sleeve 3, and the rotor blade 5 being provided with a Gurney flap 6, the Gurney flap 6 being a protruding structure vertically arranged along the trailing edge of the rotor blade 5;

[0028] The stator assembly 7 is fixedly installed in the housing assembly 1 , and the stator assembly 7 is coaxially matched with the magnetic steel 4 .

[0029] In this embodiment, a Gurney flap 6 is added to the fan rotor blade 5, so that the fan can more effectively guide the airflow during operation and reduce eddy loss, thereby improving the efficiency and air volume of the fan, significantly improving the airflow characteristic indicators of the fan, and can also effectively reduce the lag effect of the oscillating airfoil aerodynamic load and reduce the noise generated during the operation of the fan, thereby improving the acoustic characteristics of the fan.

[0030] In this embodiment, the rotor sleeve 3 and the rotor shaft 2 are fitted with interference fit and laser welding to further improve the rotor structural strength; when assembling the fan product, the original spring is replaced with an adjustment gasket to reduce the assembly preload, increase the rotation speed, reduce the current, and improve the efficiency of the fan.

[0031] In this embodiment, an annular extension portion 8 is provided on the rotor assembly, and the extension portion 8 is arranged at a position close to the root of the rotor blade 5, and the extension portion 8 is coaxially arranged with the rotor shaft 2. The extension portion 8 extends axially to a position that matches the clearance of the inner wall of the shell assembly 1, so that the rotor assembly and the shell assembly 1 are enclosed to form a dustproof isolation area 9. Under the premise of ensuring the normal operation of the rotor assembly, it can effectively prevent dust and particulate matter from entering the interior of the rotor assembly, thereby improving the dustproof ability of the product in harsh environments and improving the service life of the fan.

[0032] In this embodiment, weight-reducing holes 10 are provided on the rotor sleeve 3. By designing the structure and arrangement range of the weight-reducing holes 10, it is possible to achieve the purpose of reducing weight without affecting the overall performance of the fan. While maintaining the high-efficiency operation of the fan, it can also reduce energy consumption and extend the service life, thereby meeting the dual demands of modern industry for fan performance and economy.

[0033] In this embodiment, a dynamic balancing slot 11 is opened on the rotor blade 5, and the dynamic balancing slot 11 is used to insert a dynamic balancing adjustment plate 12. By designing the dynamic balancing slot 11, the dynamic balancing accuracy of the product rotor is further improved, and the blade can achieve a better balanced state when rotating at high speed, reducing vibration caused by imbalance and ensuring the stability of product operation.

[0034] In this embodiment, the installation angle of the rotor blade 5 ranges from 29° to 33°, and the installation angle θ is the angle between the outer chord line L2 of the blade profile at the root of the rotor blade 5 and the cascade front line L1. In this embodiment, based on the initial design installation angle of 31° at the root of the rotor blade 5, the installation angle at the root of the rotor blade 5 is reduced by 2°, increased by 2°, and increased by 3° using 3D modeling software, respectively, to obtain fan models with installation angles of 29°, 33°, and 34°, respectively. By testing the fan blade models with different installation angles (29°, 31°, 33°, and 34°), the rotation noise data of the fan blades with different installation angles are obtained as shown in Table 1.

[0035] Table 1 Data of fan blade rotation noise at different installation angles

[0036] Installation angle 29° 31° 33° 34° noise 41.6 42.8 41.4 42.5

[0037] It can be seen from the test data in Table 1 that when the installation angle θ changes, the fundamental frequency spectrum of the rotational noise remains unchanged, the noise value at the fundamental frequency does not change much, and the peak noise at the high frequency gradually weakens. Since the change in the blade installation angle mainly affects the distribution of eddy currents on the blade surface, the impact on the eddy current noise is also relatively large. After the installation angle increases, the eddy current noise gradually becomes stable from violent fluctuations, and the noise at the medium and high frequencies also decreases; but when the installation angle increases to a certain extent, the fluctuation of the eddy current noise is more obvious, and the noise in the medium frequency band increases. According to the test results, this embodiment selects a blade with an installation angle of 33°, and the noise is reduced by about 1.4dB.

[0038] In this embodiment, the magnetic steel 4 is fixedly installed in the rotor sleeve 3, and the rotor sleeve 3 is provided with a magnetic steel 4 limiting component at the installation position corresponding to the magnetic steel 4, which can ensure that the magnetic steel 4 is consistent with the position of the Hall element when assembled, thereby improving the consistency of product quality.

[0039] In this embodiment, an end cover 13 is further included. A shaft sleeve 14 is fixedly mounted on the end cover 13 . The shaft sleeve 14 extends into the inner cavity of the rotor sleeve 3 . The bearing 16 is installed in the shaft sleeve 14 to ensure stable rotation of the rotor sleeve 3 .

[0040] The stator assembly 7 is fixedly sleeved on the outer wall of the shaft sleeve 14, and an anti-rotation keyway 15 is provided between the stator assembly 7 and the shaft sleeve 14 to ensure reliable circumferential positioning of the stator after installation.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large air volume dust-proof fan structure with a Gurney flap, characterized in that: include: Housing assembly (1); A rotor assembly, the rotor assembly comprising a rotor shaft (2), a rotor sleeve (3), a magnetic steel (4) and a rotor blade (5), the rotor shaft (2) being mounted on a housing assembly (1) of a fan structure via a bearing (16), the rotor sleeve (3) and the rotor blade (5) being coaxially mounted on the rotor shaft (2), the magnetic steel (4) being fixed in the rotor sleeve (3), and the rotor blade (5) being provided with a Gurney flap (6), the Gurney flap (6) being a protruding structure vertically arranged along the rear edge of the rotor blade (5); A stator assembly (7), wherein the stator assembly (7) is fixedly installed in the housing assembly (1), and the stator assembly (7) and the magnetic steel (4) are coaxially arranged.

2. The large air volume dust-proof fan structure with Gurney flap according to claim 1 is characterized in that: The rotor assembly is provided with an annular extension portion (8), the extension portion (8) being arranged at a position close to the root of the rotor blade (5), and the extension portion (8) being arranged coaxially with the rotor shaft (2), and the extension portion (8) extending axially to a position where it is gap-matched with the inner wall of the housing assembly (1), so that the rotor assembly and the housing assembly (1) are enclosed to form a dustproof isolation zone (9).

3. The large air volume dust-proof fan structure with Gurney flap according to claim 1, characterized in that: The rotor sleeve (3) is provided with a weight-reducing hole (10).

4. The large air volume dust-proof fan structure with Gurney flap according to claim 1, characterized in that: The rotor blade (5) is provided with a dynamic balancing slot (11), and the dynamic balancing slot (11) is used for inserting a dynamic balancing adjustment sheet (12).

5. The large air volume dust-proof fan structure with Gurney flap according to claim 1, characterized in that: The installation angle of the rotor blade (5) ranges from 29° to 33°, and the installation angle is the angle between the outer chord line of the blade profile at the root of the rotor blade (5) and the blade cascade front line.

6. The large air volume dust-proof fan structure with Gurney flap according to claim 1, characterized in that: The magnetic steel (4) is fixedly installed in the rotor sleeve (3), and the rotor sleeve (3) is provided with a magnetic steel (4) limiting component at an installation position corresponding to the magnetic steel (4).

7. The large air volume dust-proof fan structure with Gurney flap according to claim 1, characterized in that: It also comprises an end cover (13), on which a shaft sleeve (14) is fixedly mounted, the shaft sleeve (14) extending into the inner cavity of the rotor sleeve (3), and the bearing (16) being mounted in the shaft sleeve (14).

8. The large air volume dust-proof fan structure with Gurney flap according to claim 7, characterized in that: The stator assembly (7) is fixedly sleeved on the outer wall of the shaft sleeve (14), and an anti-rotation keyway (15) is provided between the stator assembly (7) and the shaft sleeve (14).

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