Centrifugal fan impeller and centrifugal fan

Abstract

This utility model relates to the field of fan technology, specifically to a centrifugal fan impeller and a centrifugal fan. The centrifugal fan impeller includes an impeller body and multiple blades; the multiple blades are connected to the impeller body and are arranged at intervals around the axis of the impeller body; wherein the blade inlet angle is 25°–35°, the blade outlet angle is 175°–185°, and the blade wrap angle is 13°–17°. This centrifugal fan impeller, when applied to a centrifugal fan, can resolve the contradiction between the high-pressure requirements and noise control of the centrifugal fan through optimization of the blade geometry parameters, thereby improving its dynamic pressure conversion efficiency, reducing its operating noise, and minimizing efficiency degradation.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and more specifically, to a centrifugal fan impeller and a centrifugal fan. Background Technology

[0002] Existing centrifugal fan impellers suffer from problems such as low dynamic pressure conversion efficiency, high operating noise, and rapid efficiency decay, especially under high-pressure scenarios where these problems become more pronounced. Utility Model Content

[0003] The purpose of this utility model is to provide 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 decay.

[0004] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a centrifugal fan impeller, which includes an impeller body and multiple blades; Multiple blades are connected to the impeller body, and the multiple blades are arranged sequentially at intervals around the axis of the impeller body; The blade inlet angle is 25°-35°, the blade outlet angle is 175°-185°, and the blade wrap angle is 13°-17°.

[0005] In an optional implementation, the blade inlet angle is 30°.

[0006] In an optional implementation, the blade exit angle is 180°.

[0007] In an optional implementation, the blade wrap angle is 15°.

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

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

[0010] In an optional embodiment, the blade includes two continuously arranged arc-shaped segments, and the radius of curvature of the arc-shaped segments gradually increases along the direction from the blade's inlet position to its outlet position.

[0011] In an optional implementation, one arc segment has a radius of curvature of 14mm-16mm, and the other arc segment has a radius of curvature of 22mm-23.5mm.

[0012] Secondly, this utility model provides a centrifugal fan, which includes the centrifugal fan impeller described above.

[0013] The beneficial effects of the centrifugal fan impeller and centrifugal fan provided in this embodiment of the invention include: This centrifugal fan impeller includes an impeller body and multiple blades. The blades are connected to the impeller body and are arranged at intervals around the axis of the impeller body. The blade inlet angle is 25°-35°, the blade outlet angle is 175°-185°, and the blade wrap angle is 13°-17°. This centrifugal fan impeller, applied in centrifugal fans, optimizes the blade geometry to resolve the conflict between high-pressure requirements and noise control, thereby improving dynamic pressure conversion efficiency, reducing operating noise, and minimizing efficiency degradation. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the centrifugal fan impeller provided in this embodiment; Figure 2 This is a cross-sectional view of the centrifugal fan impeller provided in this embodiment; Figure 3 This is a schematic diagram of the geometric parameters of the blade provided in this embodiment.

[0016] Icons: 100 - Centrifugal fan impeller; 110 - Impeller body; 120 - Blade. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0022] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0023] Please refer to Figures 1-3 This embodiment provides a centrifugal fan impeller 100, which includes an impeller body 110 and a plurality of blades 120; Multiple blades 120 are connected to the impeller body 110, and the multiple blades 120 are arranged at intervals around the axis of the impeller body 110. Among them, the blade inlet angle of 120° (e.g.) Figure 3 Middle Mark (As shown) is 25°-35°, blade exit angle (e.g. Figure 3 Middle Mark (As shown) is 175°-185°, blade wrap angle (as shown) Figure 3 (The value marked θ) is 13°-17°.

[0024] Please refer to Figures 1-3 The working principle of the centrifugal fan impeller 100 is as follows: The centrifugal fan impeller 100 includes an impeller body 110 and multiple blades 120. The multiple blades 120 are connected to the impeller body 110 and are arranged at intervals 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°. This centrifugal fan impeller 100, when applied to centrifugal fans, can resolve the conflict between high-pressure requirements and noise control in centrifugal fans through optimization of the blade geometry, thereby improving its dynamic pressure conversion efficiency, reducing its operating noise, and minimizing efficiency degradation.

[0025] In this embodiment, when configuring each blade 120, each blade 120 can adopt the same geometric parameters. Therefore, this embodiment is described with the blade inlet angle, blade outlet angle and blade wrap angle of one of the blades 120 as an example.

[0026] Based on the above, please refer to Figures 1-3 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 intake impact loss and ensure that the impact loss accounts for ≤10%.

[0027] When configuring the blade exit angle of blade 120, its blade exit angle is set to 175°-185°. Specifically, the blade exit angle can be 175°, 176°, 177°, 178°, 179°, 180°, 181°, 182°, 183°, 184° or -185°. The purpose of setting the blade exit angle as described above is to maximize the tangential velocity component, and the theoretical pressure head can be increased by 25%-30%.

[0028] When configuring the blade wrap angle of the 120 blade, 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 its slip coefficient σ=0.55-0.65, while the slip coefficient in conventional design is σ=0.8-0.9.

[0029] 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 decay.

[0030] It should be noted that, based on the above, there are various 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, only one geometric parameter is selected for explanation. Specifically, this embodiment uses a blade inlet angle of 30°, a blade outlet angle of 180°, and a blade wrap angle of 15° as an example. This setting optimizes the geometric parameters of the blade 120 and ensures that the set blade inlet angle, blade outlet angle, and blade wrap angle are optimized and coordinated. This achieves high pressure and low noise while maintaining structural strength. Moreover, compared with the existing technology that optimizes performance by increasing the number of blades 120 or adjusting the speed, this optimization method reduces 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. It can adapt to different scenarios with different numbers of blades 120 and impeller speeds, thus maintaining its excellent high pressure and low noise performance under different scenarios with different numbers of blades 120 and impeller speeds.

[0031] It should also be noted that, based on the above-mentioned settings of the geometric parameters of the blade inlet angle, blade outlet angle, and blade wrap angle, in this embodiment, when configuring the blade 120, 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, based on the above-mentioned settings 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.

[0032] Furthermore, as can be seen from the above, this embodiment sets the blade inlet angle to 30°, the blade outlet angle to 180°, and the blade wrap angle to 15° as an example when configuring the blade inlet angle, blade outlet angle, and blade wrap angle. Under these geometric parameters, the number of blades 120 can be 47.

[0033] Based on the above, please refer to Figures 1-3 In this embodiment, to meet structural performance requirements and ensure the accuracy of geometric parameters such as the blade inlet angle, blade outlet angle, and blade wrap angle during manufacturing, the blade 120 can be made of glass fiber reinforced polypropylene, with a glass fiber content of 15%-25%. Furthermore, the thickness of the blade 120 (e.g., ...) is... Figure 3 The thickness (as indicated by d) can be set to 1.0-1.5mm. Specifically, the thickness of blade 120 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm.

[0034] In other embodiments of this utility model, the blade 120 may also be made of other materials or processing methods, which will not be described in detail here.

[0035] In addition to the aforementioned geometric parameters and the arrangement of the number of blades 120, when configuring the blades 120, each blade 120 can include two continuously arranged arc-shaped segments, and the radius of curvature of the arc-shaped segments gradually increases along the direction from the inlet position to the outlet position of the blade 120. That is, the blades 120 in this embodiment are configured with a double arc based on the aforementioned geometric parameters, and the double arcs are continuously arranged with a gradually increasing radius of curvature. This optimizes flow uniformity and reduces local backflow.

[0036] Specifically, the radius of curvature of one of the arc segments is 14mm-16mm, that is, its radius of curvature can be 14.1mm, 14.2mm, 14.3mm, 14.4mm, 14.5mm, 14.6mm, 14.7mm, 14.8mm, 14.9mm, 15mm, 15.1mm, 15.2mm, 15.3mm, 15.4mm, 15.5mm, 15.6mm, 15.7mm, 15.8mm, 15.9mm or 16mm; The radius of curvature of the other arc segment is 22mm-23.5mm, that is, its radius of curvature can be 22mm, 22.1mm, 22.2mm, 22.3mm, 22.4mm, 22.5mm, 22.6mm, 22.7mm, 22.8mm, 22.9mm, 23mm, 23.1mm, 23.3mm, 23.4mm or 23.5mm; In this application, please refer to Figures 1-3 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 to 180°, and the blade wrap angle to 15°. Furthermore, under these geometric parameters, the number of blades 120 is 47. When the blades 120 are configured as double arcs, the radius of curvature of one arc segment is... =14.8±0.5mm, and the radius of curvature of the other arc segment is =22.6±0.5mm.

[0037] This configuration, through optimization of the blade geometry and coordinated optimization of the blade inlet angle, outlet angle, and wrap angle, achieves high pressure and low noise while maintaining structural strength. This resolves the conflict between the high-pressure requirements and noise control of centrifugal fans, improving dynamic-pressure conversion efficiency, reducing operating noise, minimizing efficiency degradation, balancing flow refinement and friction loss, optimizing flow uniformity, and reducing local backflow. Furthermore, compared to existing technologies that optimize performance by increasing the number of blades or adjusting the speed, this optimization method reduces limitations on the number of blades and impeller speed, improving usability under different blade numbers and impeller speeds. This allows it to adapt to various scenarios with different blade numbers and impeller speeds, maintaining its excellent high-pressure, low-noise performance.

[0038] Based on the above, please refer to Figures 1-3 This embodiment also provides a centrifugal fan, which includes the centrifugal fan impeller 100 described above. Because this centrifugal fan employs the centrifugal fan impeller 100, it possesses all the advantages of the centrifugal fan impeller 100 described above, which will not be repeated here.

[0039] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A centrifugal fan impeller, characterized in that: The centrifugal fan impeller includes an impeller body and multiple blades; The multiple blades are connected to the impeller body, and the multiple blades are arranged at intervals around the axis of the impeller body; The blade has an inlet angle of 25°-35°, an outlet angle of 175°-185°, and a wrap angle of 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 exit 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 blades is 45-50.

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

7. The centrifugal fan impeller according to any one of claims 1-6, characterized in that: The blade comprises two continuously arranged arc-shaped segments, and the radius of curvature of the arc-shaped segments gradually increases along the direction from the inlet position to the outlet position of the blade.

8. The centrifugal fan impeller according to claim 7, characterized in that: One of the arc segments has a radius of curvature of 14mm-16mm, and the other arc segment has a radius of curvature of 22mm-23.5mm.

9. A centrifugal fan, characterized in that: The centrifugal fan includes a centrifugal fan impeller as described in any one of claims 1-8.

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