Centrifugal impeller, centrifugal fan and electric appliance

Abstract

The utility model discloses a centrifugal impeller, centrifugal fan and electric appliance relates to centrifugal fan structure technical field, wherein, the centrifugal impeller includes hub, a plurality of blades and connecting ring, a plurality of blades along the circumferential arrangement of hub, and one end is connected in hub, the blade is arc shape setting, and the blade has the windward face and leeward face in the thickness direction, the windward face is arranged to have fixed radius of curvature, the distance of the windward face of the blade the center of circle with the rotation axis of centrifugal impeller is D, the inner diameter of a plurality of blades is D1, and the outer diameter is D2, then, the connecting ring is arranged in the other end of a plurality of blades, and is used for connecting and fixing a plurality of the blade. The utility model aims at providing a centrifugal impeller of uniformity processing.

Description

Technical Field

[0001] This utility model relates to the technical field of centrifugal fan structure, and in particular to a centrifugal impeller, a centrifugal fan, and electrical components. Background Technology

[0002] Traditional impeller blade designs often employ single circular arcs, multi-segment circular arcs, or other complex curves. These design methods present challenges in manufacturing and consistency. Specifically, if the center of each blade profile does not follow a specific pattern, the positioning and profile control of each blade become quite complex during manufacturing (especially mold manufacturing). Even minor errors can disrupt the impeller's dynamic balance, exacerbating vibration and noise. Utility Model Content

[0003] The main purpose of this invention is to provide a centrifugal impeller, a centrifugal fan, and electrical components, with the aim of providing a centrifugal impeller that facilitates consistent manufacturing.

[0004] To achieve the above objectives, this utility model proposes a centrifugal impeller, wherein the centrifugal impeller comprises: Wheel hub; Multiple blades are arranged circumferentially along the hub and connected to the hub at one end. The blades are arc-shaped and have a windward and leeward side in the thickness direction. The windward side has a fixed radius of curvature. The distance D between the center of the windward side of the blade and the rotation axis of the centrifugal impeller is given. The inner diameter of the multiple blades is D1, and the outer diameter is D2. ;as well as, A connecting ring is disposed at the other end of the plurality of blades and is used to connect and fix the plurality of blades.

[0005] In one embodiment, the inlet angle of the blade is β1, where β1 ≤ 90°.

[0006] In one embodiment, the exit angle of the blade is β2, then: .

[0007] In one embodiment, the exit angle of the blade is β2, then β2 > 90°.

[0008] In one embodiment, 120° < β2 ≤ 150°.

[0009] In one embodiment, the thickness of the blade is uniform throughout.

[0010] In one embodiment, the thickness of the blade is δ, then 0.3mm≤δ≤2mm.

[0011] In one embodiment, the number of blades is Z, then 20 ≤ Z ≤ 60.

[0012] This utility model also proposes a centrifugal fan, wherein the centrifugal fan includes a centrifugal impeller, the centrifugal impeller includes a hub, multiple blades, and a connecting ring, the multiple blades are arranged circumferentially along the hub and one end is connected to the hub, the blades are arc-shaped, and the blades have a windward side and a leeward side in the thickness direction, the windward side is set to have a fixed radius of curvature, the distance D between the center of the windward side of the blade and the rotation axis of the centrifugal impeller, the inner diameter of the multiple blades is D1, and the outer diameter is D2. The connecting ring is located at the other end of the plurality of blades and is used to connect and fix the plurality of blades.

[0013] This utility model also proposes an electrical appliance, wherein the electrical appliance includes a centrifugal fan, the centrifugal fan includes a centrifugal impeller, the centrifugal impeller includes a hub, multiple blades, and a connecting ring, the multiple blades are arranged circumferentially along the hub and one end is connected to the hub, the blades are arc-shaped, and the blades have a windward side and a leeward side in the thickness direction, the windward side is set to have a fixed radius of curvature, the distance D between the center of the windward side of the blade and the rotation axis of the centrifugal impeller, the inner diameter of the multiple blades is D1, and the outer diameter is D2. The connecting ring is located at the other end of the plurality of blades and is used to connect and fix the plurality of blades.

[0014] In the technical solution of this utility model, multiple blades are fixed by the hub and the connecting ring. The blade profile is arc-shaped, and the windward surface has a fixed radius of curvature, that is, at least the windward surface of the blade is set as a single circular arc. This facilitates processing and makes the airflow smoother when passing through the blade, reducing eddy current losses and improving fan efficiency. Furthermore, to further facilitate consistent processing, the radii of curvature of the windward surfaces of multiple blades are consistent, and the centers of the windward surfaces of multiple blades are located on the same control circle. This provides geometric constraints on the blades, meeting the high consistency processing requirements. Specifically, the distance D between the center of the windward surface and the centrifugal impeller rotation axis, that is, the radius D of the aforementioned control circle, satisfies 0.85×(D1+D2) / 2 ≤ D ≤ 1.15×(D1+D2) / 2, where D1 is the inner diameter of the plurality of blades and D2 is the outer diameter of the plurality of blades. This constrains the geometric shape of the blades to facilitate processing while ensuring the consistency of the plurality of blades, ensuring uniform stress on the blades, and enhancing structural stability and operational balance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the centrifugal impeller provided by this utility model; Figure 2 for Figure 1 Another three-dimensional structural diagram of the centrifugal impeller in the diagram; Figure 3 for Figure 1 A three-dimensional structural diagram of the centrifugal impeller in the image; Figure 4 for Figure 1 A schematic diagram of the cross-section of a centrifugal impeller.

[0017] Explanation of icon numbers: 100. Centrifugal impeller; 1. Hub; 2. Blades; 21. Windward side; 22. Control circle; 3. Connecting ring.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] 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 scope of protection of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] Traditional impeller blade designs often employ single circular arcs, multi-segment circular arcs, or other complex curves. These design methods present challenges in manufacturing and consistency. Specifically, if the center of each blade profile does not follow a specific pattern, the positioning and profile control of each blade become quite complex during manufacturing (especially mold manufacturing). Even minor errors can disrupt the impeller's dynamic balance, exacerbating vibration and noise.

[0023] In view of this, this utility model proposes a centrifugal impeller, please refer to [link / reference]. Figures 1 to 4 The following is a detailed description of the centrifugal impeller as proposed in this utility model, with reference to the specific accompanying drawings.

[0024] Please see Figure 1 and Figure 4 The centrifugal impeller 100 includes a hub 1, multiple blades 2, and a connecting ring 3. The multiple blades 2 are arranged circumferentially along the hub 1 and connected at one end to the hub 1. The blades 2 are arc-shaped and have a windward side 21 and a leeward side in the thickness direction. The windward side 21 has a fixed radius of curvature. The distance D between the center of the windward side 21 of the blade 2 and the rotation axis of the centrifugal impeller 100 is given. The inner diameter of the multiple blades 2 is D1, and the outer diameter is D2. The connecting ring 3 is disposed at the other end of the plurality of blades 2 and is used to connect and fix the plurality of blades 2.

[0025] In the technical solution of this utility model, multiple blades 2 are fixed by the hub 1 and the connecting ring 3. The blade shape of the blade 2 is set as arc, and the windward surface 21 has a fixed radius of curvature, that is, at least the windward surface 21 of the blade 2 is set as a single arc. This facilitates processing and makes the airflow more stable when passing through the blade 2, reducing eddy current losses and improving the efficiency of the fan. On this basis, in order to further facilitate consistent processing, the radius of curvature of the windward surface 21 of multiple blades 2 is the same, and the center of the windward surface 21 of multiple blades 2 is located on the same control circle 22. This provides geometric constraints on the blades 2 and meets the requirements of high consistency processing. Specifically, the distance D between the center of the windward surface 21 and the rotation axis of the centrifugal impeller 100, that is, the radius D of the control circle 22, satisfies the following condition. Wherein, D1 is the inner diameter of the plurality of blades 2, and D2 is the outer diameter of the plurality of blades 2. The geometric shape of the blades 2 is constrained to facilitate processing while ensuring the consistency of the plurality of blades 2, ensuring that the blades 2 are subjected to uniform force, and enhancing structural stability and operational balance.

[0026] Based on the geometric constraints on the windward surface 21 of the blade 2, determining the blade profile of the blade 2 requires further limiting the inlet angle and outlet angle parameters of the blade 2. The inlet angle of the blade 2 is the inlet installation angle, which is the angle between the tangent direction at the inlet of the blade 2 and the opposite direction of the rotational circumference of the centrifugal impeller 100. Its core function is to ensure that the fluid enters the centrifugal impeller 100 with minimal impact loss and guides the fluid's state (pressure and velocity) to the main working area of ​​the centrifugal impeller 100. At the design flow rate, the designer wants the fluid to smoothly and without impact "attach" to the blade 2. In this case, the inlet angle of the blade 2 is designed to be equal to or very close to the relative flow angle of the fluid inlet. Therefore, in this application, the inlet angle of the blade 2 is β1, where β1 ≤ 90°. This allows the inlet angle of the blade 2 to match the relative flow angle of the fluid inlet, reducing inlet impact loss. Furthermore, in this application, the inlet angle of the blade 2 is determined by the diameter D of the control circle 22, the inner diameter D1 of the plurality of blades 2, and the outlet angle β2 of the blade 2. The specific calculation formula is as follows: .

[0027] Furthermore, the centrifugal fan includes a forward centrifugal fan and a backward centrifugal fan. The difference between the forward centrifugal fan and the backward centrifugal fan lies in the shape of the blades 2 and the outlet installation angle. The outlet angle of the blades 2 of the forward centrifugal fan is greater than 90°, while that of the backward centrifugal fan is the opposite. In this application, the centrifugal fan needs to provide a high pressure rise within the same size to be used in ventilation and heat dissipation fields with strict space requirements. The forward centrifugal fan is suitable for this application. Therefore, in this application, the outlet angle β2 of the blades 2 is set to be greater than 90°. The outlet angle is the outlet installation angle of the blades 2, which is the angle between the tangent direction at the outlet of the blades 2 and the opposite direction of the rotation circumference of the centrifugal impeller 100.

[0028] Furthermore, because the gas in the forward centrifugal fan experiences significant impact and vortex losses within the flow channel, resulting in low efficiency, it is necessary to limit the inlet and outlet angles of the blades 2 to reduce inlet impact losses and outlet energy losses, thereby improving the efficiency of the centrifugal fan. The inlet angle of the blades 2 has already been limited above and will not be repeated here. In this embodiment, the outlet angle of the blades 2 is limited to 120° < β2 ≤ 150° to improve the matching between the outlet and the volute or air duct, reduce outlet energy losses, and reduce vortex generation, thereby reducing noise and meeting functional requirements.

[0029] Furthermore, the thickness of the blades 2 is uniform throughout, meaning that the blades 2 are uniform thickness plate blades. While meeting functional requirements, they are easy to process, have low mold costs, and high material utilization, which can significantly reduce the processing cost of the centrifugal impeller 100. Regarding the specific setting of the thickness of the blades 2, it is understood that the thickness of the blades 2 directly affects the aerodynamic efficiency and structural strength of the fan. If the blades 2 are too thick, the windward surface area 21 will increase, resulting in greater flow resistance and eddy current losses, thus reducing efficiency. On the other hand, if the blades 2 are too thin, the structural strength of the blades 2 will be reduced, thus reducing their reliability. Therefore, the specific setting of the thickness of the blades 2 needs to balance the above requirements. Specifically, in this embodiment, the thickness of the blades 2 is set to be greater than or equal to 0.3 mm and less than or equal to 2 mm to meet the above requirements.

[0030] Furthermore, the centrifugal fan is configured as a forward centrifugal fan, as described above. The design of the forward blades 2 results in a higher absolute velocity of air leaving the centrifugal impeller 100, thereby efficiently converting it into static pressure in the volute. More blades 2 can guide and propel the air more evenly, ensuring that the airflow can effectively follow the shape of the blades 2 and generate higher pressure. Therefore, in this embodiment, to meet the performance requirements of the centrifugal fan, the number of blades 2 is set to be no less than 20 and no more than 60.

[0031] In summary, this application aims to provide a forward centrifugal impeller 100 based on a concentric circular arc profile. The centrifugal impeller 100 achieves geometric constraints on the blades 2 by setting the center of the windward surface 21 of all the blades 2 to be located on a control circle 22. Simultaneously, it achieves precise matching of the inlet and outlet angles and optimization of the flow channel, thereby achieving high efficiency and low noise performance. This improves upon the problems of low efficiency, complex internal flow, and easy generation of vortices and separation in traditional forward centrifugal impellers 100, which lead to high operating noise, thus meeting functional requirements.

[0032] This application also proposes a centrifugal fan, wherein the centrifugal fan includes a centrifugal impeller 100, the specific structure of which is as described in the above embodiments. Since the centrifugal fan adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0033] This application also proposes an electrical appliance, wherein the electrical appliance includes a centrifugal fan, the specific structure of which is as described in the above embodiments. Since the electrical appliance adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. The electrical appliance includes household appliances, automotive ventilation systems, or electronic product radiators.

[0034] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A centrifugal impeller, characterized in that, include: Wheel hub; Multiple blades are arranged circumferentially along the hub and connected to the hub at one end. The blades are arc-shaped and have a windward and leeward side in the thickness direction. The windward side has a fixed radius of curvature. The distance D between the center of the windward side of the blade and the rotation axis of the centrifugal impeller is given. The inner diameter of the multiple blades is D1, and the outer diameter is D2. ; as well as, A connecting ring is disposed at the other end of the plurality of blades and is used to connect and fix the plurality of blades.

2. The centrifugal impeller as described in claim 1, characterized in that, If the inlet angle of the blade is β1, then β1 ≤ 90°.

3. The centrifugal impeller as described in claim 2, characterized in that, If the exit angle of the blade is β2, then: 。 4. The centrifugal impeller as described in claim 1, characterized in that, If the exit angle of the blade is β2, then β2 > 90°.

5. The centrifugal impeller as described in claim 4, characterized in that, 120°＜β2≤150°。 6. The centrifugal impeller as described in claim 1, characterized in that, The thickness of the blade is consistent throughout.

7. The centrifugal impeller as described in claim 6, characterized in that, If the thickness of the blade is δ, then 0.3mm≤δ≤2mm.

8. The centrifugal impeller as described in claim 1, characterized in that, If the number of blades is Z, then 20 ≤ Z ≤ 60.

9. A centrifugal fan, characterized in that, Includes the centrifugal impeller as described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Including the centrifugal fan as described in claim 9.

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