Centrifugal fan impeller and centrifugal fan

Abstract

The invention relates to the technical field of fans, in particular to a centrifugal fan impeller and a centrifugal fan. The centrifugal fan impeller comprises an impeller body and a plurality of blades. The multiple blades are connected with the impeller body and are sequentially arranged at intervals around the axis of the impeller body. The blade inlet angle of the blade ranges from 25 degrees to 35 degrees, the blade outlet angle of the blade ranges from 175 degrees to 185 degrees, and the blade wrap angle of the blade ranges from 13 degrees to 17 degrees. The centrifugal fan impeller is applied to a centrifugal fan, the contradiction between the high-pressure requirement and noise control of the centrifugal fan can be solved by optimizing the geometric parameters of the blades, the dynamic pressure conversion efficiency of the centrifugal fan can be improved, the operation noise of the centrifugal fan can be reduced, and the efficiency attenuation of the centrifugal fan can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a centrifugal fan impeller and a centrifugal fan. Background Art

[0002] Existing centrifugal fan impellers have problems such as low dynamic pressure conversion efficiency, high operating noise and rapid efficiency decay, especially in high-pressure scenarios, these problems become more obvious. Summary of the Invention

[0003] The purpose of the present invention includes providing a centrifugal fan impeller and a centrifugal fan, which can solve the contradiction between high pressure demand and noise control by optimizing the geometric parameters of the blades, thereby improving its dynamic pressure conversion efficiency, reducing its operating noise, and reducing its efficiency attenuation.

[0004] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a centrifugal fan impeller, the centrifugal fan impeller comprising an impeller body and a plurality of blades; The plurality of blades are connected to the impeller body, and the plurality of blades are sequentially spaced around the axis of the impeller body; Among them, the blade inlet angle of the blade is 25°-35°, the blade outlet angle is 175°-185°, and the blade wrap angle is 13°-17°.

[0005] In an alternative embodiment, the blade inlet angle is 30°.

[0006] In an alternative embodiment, the blade outlet angle is 180°.

[0007] In an alternative embodiment, the blade wrap angle is 15°.

[0008] In an optional embodiment, the number of blades is 45-50.

[0009] In an optional embodiment, the number of blades is 47.

[0010] In an optional embodiment, the blade is made of glass fiber reinforced polypropylene, and the glass fiber content thereof is 15%-25%.

[0011] In an optional embodiment, the blade includes two continuously arranged arc segments, and the curvature radius of the arc segments gradually increases along the direction from the inlet position to the outlet position of the blade.

[0012] In an optional embodiment, the curvature radius of one arc segment is 14 mm-16 mm, and the curvature radius of another arc segment is 22 mm-23.5 mm.

[0013] In a second aspect, the present invention provides a centrifugal fan, which includes the centrifugal fan impeller described above.

[0014] The centrifugal fan impeller and the centrifugal fan provided by the embodiments of the present invention have the following beneficial effects: This centrifugal fan impeller includes an impeller body and multiple blades. The multiple blades are connected to the impeller body and are spaced apart around the axis of the impeller body. The blades have an inlet angle of 25°-35°, an outlet angle of 175°-185°, and a wrap angle of 13°-17°. This centrifugal fan impeller is used in centrifugal fans. By optimizing the blade geometric parameters, it can resolve the conflict between the high pressure requirement and noise control of the centrifugal fan, thereby improving the dynamic pressure conversion efficiency, reducing operating noise, and reducing efficiency degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic structural diagram of a centrifugal fan impeller provided in this embodiment; Figure 2 A cross-sectional view of a centrifugal fan impeller provided in this embodiment; Figure 3 A schematic diagram of the geometric parameters of the blade provided in this embodiment.

[0017] Icon: 100- centrifugal fan impeller; 110- impeller body; 120- blades. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0021] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0023] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0024] Please refer to Figure 1-Figure 3 , this embodiment provides a centrifugal fan impeller 100, the centrifugal fan impeller 100 includes an impeller body 110 and a plurality of blades 120; The plurality of blades 120 are connected to the impeller body 110 , and the plurality of blades 120 are sequentially spaced around the axis of the impeller body 110 ; Among them, the blade inlet angle of the blade 120 (such as Figure 3 Mark As shown) is 25°-35°, the blade outlet angle (as shown) Figure 3 Mark As shown) is 175°-185°, the blade wrap angle (as shown) Figure 3 The angle (as indicated by the mark θ) is 13°-17°.

[0025] Please refer to Figure 1-Figure 3 The working principle of the centrifugal fan impeller 100 is: The centrifugal fan impeller 100 includes an impeller body 110 and a plurality of blades 120. The plurality of blades 120 are connected to the impeller body 110 and are spaced apart around the axis of the impeller body 110. The blades 120 have an inlet angle of 25°-35°, an outlet angle of 175°-185°, and a wrap angle of 13°-17°. The centrifugal fan impeller 100 is applied to a centrifugal fan. By optimizing the geometric parameters of the blades 120, it can resolve the conflict between the high pressure requirement and noise control of the centrifugal fan, thereby improving the dynamic pressure conversion efficiency, reducing operating noise, and reducing efficiency degradation.

[0026] In this embodiment, when configuring each blade 120, each blade 120 may adopt the same geometric parameters. Therefore, this embodiment is described by taking the angle settings of the blade inlet angle, blade outlet angle and blade wrap angle of one of the blades 120 as an example.

[0027] Based on the above, please refer to Figure 1-Figure 3 In this embodiment, when configuring the blade inlet angle of the blade 120, the blade inlet angle can be set to 25°-35°. Specifically, the blade inlet angle can be 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34° or 35°. The purpose of setting the blade inlet angle is to reduce the intake shock loss, and the shock loss ratio can be ≤10%.

[0028] When configuring the blade outlet angle of blade 120, the blade outlet angle is set to 175°-185°. Specifically, the blade outlet angle can be 175°, 176°, 177°, 178°, 179°, 180°, 181°, 182°, 183°, 184° or -185°. The purpose of setting the blade outlet angle is to maximize the tangential velocity component, and the theoretical pressure head can be increased by 25%-30%.

[0029] When configuring the blade wrap angle of blade 120, the blade wrap angle can be set to 13°-17°. Specifically, the blade wrap angle can be 13°, 14°, 15°, 16° or 17°. The purpose of setting the blade wrap angle is to enhance the airflow adhesion, and the slip coefficient σ=0.55-0.65, while the slip coefficient in conventional design is σ=0.8-0.9.

[0030] Therefore, by setting the geometric parameters of the blade inlet angle, blade outlet angle and blade wrap angle of the blade 120, high pressure and low noise can be achieved while ensuring structural strength; that is, by optimizing the geometric parameters of the blade 120, the contradiction between the high pressure requirement and noise control of the centrifugal fan can be resolved, thereby improving its dynamic pressure conversion efficiency, reducing its operating noise, and reducing its efficiency attenuation.

[0031] It should be noted that, based on the above content, there are many geometric parameters for the blade inlet angle, blade outlet angle, and blade wrap angle of each blade 120 of the centrifugal fan impeller 100. In this embodiment, one of the geometric parameters is selected for illustration. That is, in this embodiment, the blade inlet angle is set to 30°, the blade outlet angle is set to 180°, and the blade wrap angle is set to 15°. This setting method can optimize the geometric parameters of the blades 120 and optimize the geometric parameters of the blade inlet angle, blade outlet angle, and blade wrap angle to achieve high pressure and low noise while ensuring structural strength. Moreover, compared with the prior art method of optimizing performance by increasing the number of blades 120 or adjusting the speed, this optimization method can reduce the limitations on the number of blades 120 and the impeller speed, thereby improving its usability under different numbers of blades 120 and impeller speeds, and thus can adapt to use in different scenarios with different numbers of blades 120 and impeller speeds. As a result, its excellent performance of high pressure and low noise can be maintained under different numbers of blades 120 and impeller speeds.

[0032] It should also be noted that, based on the above-mentioned setting method of the geometric parameters of the blade inlet angle, blade outlet angle and blade wrap angle, when configuring the blades 120 in this embodiment, the number of blades 120 can be set to 45-50. Specifically, the number of blades 120 can be 45, 46, 47, 48, 49 or 50. In this way, on the basis of the above-mentioned setting method of the geometric parameters of the blade inlet angle, blade outlet angle and blade wrap angle, the flow refinement and friction loss can be balanced, and the discrete noise main frequency is ≥2500 Hz.

[0033] Moreover, it can be seen from the above content that when configuring the blade inlet angle, blade outlet angle and blade wrap angle, this embodiment takes the blade inlet angle as 30°, the blade outlet angle as 180°, and the blade wrap angle as 15° as an example for explanation. Under this geometric parameter, the number of blades 120 can be set to 47.

[0034] Based on the above, please refer to Figure 1-Figure 3 In this embodiment, when manufacturing the blade 120, in order to meet its structural performance and ensure the accuracy of the geometric parameters of the blade inlet angle, blade outlet angle and blade wrap angle during the manufacturing process, the blade 120 can be made of glass fiber reinforced polypropylene, and the glass fiber content thereof is 15%-25%, and the thickness of the blade 120 (such as Figure 3 The thickness of the blade 120 (as shown by mark d) can be set to 1.0-1.5 mm. Specifically, the thickness of the blade 120 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm.

[0035] In other embodiments of the present invention, the blades 120 may also be made of other materials or processed in other ways, which will not be described in detail here.

[0036] In addition to the aforementioned geometric parameters and the number of blades 120, the blades 120 can be configured so that they include two continuously arranged arc segments, with the radius of curvature of the arc segments gradually increasing from the inlet to the outlet of the blades 120. That is, the blades 120 of this embodiment utilize a dual-arc configuration based on the aforementioned geometric parameters. Furthermore, the two arcs are continuously arranged with a gradually increasing radius of curvature. This configuration optimizes flow uniformity and reduces localized backflow.

[0037] Specifically, the curvature radius of one of the arc segments is 14 mm-16 mm, that is, the curvature radius can be 14.1 mm, 14.2 mm, 14.3 mm, 14.4 mm, 14.5 mm, 14.6 mm, 14.7 mm, 14.8 mm, 14.9 mm, 15 mm, 15.1 mm, 15.2 mm, 15.3 mm, 15.4 mm, 15.5 mm, 15.6 mm, 15.7 mm, 15.8 mm, 15.9 mm or 16 mm; The curvature radius of the other arc segment is 22 mm to 23.5 mm, that is, the curvature radius can be 22 mm, 22.1 mm, 22.2 mm, 22.3 mm, 22.4 mm, 22.5 mm, 22.6 mm, 22.7 mm, 22.8 mm, 22.9 mm, 23 mm, 23.1 mm, 23.3 mm, 23.4 mm or 23.5 mm; In this application, please refer to Figure 1-Figure 3 As can be seen from the above, in this embodiment, when configuring the blade inlet angle, blade outlet angle, and blade wrap angle, the blade inlet angle is set to 30°, the blade outlet angle is set to 180°, and the blade wrap angle is set to 15°. Moreover, under this geometric parameter, the number of blades 120 is 47. When the blades 120 are set to double arcs, the curvature radius of one of the arc segments is set to =14.8±0.5mm, the curvature radius of the other arc segment is =22.6±0.5mm.

[0038] Such a setting method can achieve high pressure and low noise while ensuring structural strength by optimizing the geometric parameters of the blades 120 and optimizing the geometric parameters of the blade inlet angle, blade outlet angle and blade wrap angle, thereby resolving the contradiction between the high pressure demand and noise control of the centrifugal fan, thereby improving its dynamic pressure conversion efficiency, reducing its operating noise, and reducing its efficiency attenuation, balancing flow refinement and friction loss, optimizing flow uniformity, and reducing local backflow. Moreover, such an optimization method, compared with the prior art method of optimizing performance by increasing the number of blades 120 or adjusting the speed, can reduce the limitations on the number of blades 120 and the impeller speed, thereby improving its usability under different numbers of blades 120 and impeller speeds, and thus being able to adapt to use in different scenarios with different numbers of blades 120 and impeller speeds, thereby maintaining its excellent performance of high pressure and low noise under different numbers of blades 120 and impeller speeds.

[0039] Based on the above, please refer to Figure 1-Figure 3 This embodiment further provides a centrifugal fan, which includes the centrifugal fan impeller 100. By adopting the centrifugal fan impeller 100, the centrifugal fan has all the advantages of the centrifugal fan impeller 100, which will not be described in detail here.

[0040] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily conceived by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A centrifugal fan impeller, characterized in that: The centrifugal fan impeller includes an impeller body and a plurality of blades; The plurality of blades are connected to the impeller body, and the plurality of blades are sequentially spaced around the axis of the impeller body; Wherein, the blade inlet angle of the blade is 25°-35°, the blade outlet angle is 175°-185°, and the blade wrap angle is 13°-17°.

2. The centrifugal fan impeller according to claim 1, characterized in that: The blade inlet angle is 30°.

3. The centrifugal fan impeller according to claim 1, characterized in that: The blade outlet angle is 180°.

4. The centrifugal fan impeller according to claim 1, characterized in that: The blade wrap angle is 15°.

5. The centrifugal fan impeller according to claim 1, characterized in that: The number of the leaves is 45-50.

6. The centrifugal fan impeller according to claim 5, characterized in that: The number of the blades is 47.

7. The centrifugal fan impeller according to claim 1, characterized in that: The blades are made of glass fiber reinforced polypropylene, and the glass fiber content is 15%-25%.

8. The centrifugal fan impeller according to any one of claims 1 to 7, characterized in that: The blade comprises two continuously arranged arc segments, and the curvature radius of the arc segments gradually increases along the direction from the inlet position to the outlet position of the blade.

9. The centrifugal fan impeller according to claim 8, characterized in that: The curvature radius of one of the arc segments is 14 mm to 16 mm, and the curvature radius of the other arc segment is 22 mm to 23.5 mm.

10. A centrifugal fan, characterized in that: The centrifugal fan comprises a centrifugal fan impeller according to any one of claims 1 to 9.

Images