Impeller with blades with different thicknesses

Abstract

The impeller comprises a hub and a plurality of fan blades extending outwards in the radial direction of the periphery of the hub, each fan blade comprises a first arc section and a second arc section in the extending direction, the first arc section is connected with the hub, and the second arc section is connected with the hub. The thickness of the second arc section in the extending direction is not equal to the thickness of the first arc section in the extending direction. Through the design that the thickness of the blade tips is increased, the aerodynamic performance of the impeller can be remarkably improved, the air volume is increased, noise is reduced, the service life of equipment is prolonged, and wide application prospects are achieved.

Description

Technical Field

[0001] The utility model relates to the field of heat dissipation equipment, in particular to an impeller with blades of unequal thickness. Background Art

[0002] In traditional impeller design, the thickness of the blade is roughly uniform along the entire length. However, such a design will produce large air disturbances when the impeller rotates at high speed, resulting in the generation of vortices, and the generation of air disturbances and vortices increases aerodynamic noise. Vortices not only increase aerodynamic resistance, but also cause energy loss, reduce impeller efficiency, and increase impeller wear and shorten its service life. Therefore, it is urgent to optimize the impeller design to improve the impeller's aerodynamic performance and reduce noise. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an impeller with blades of unequal thickness. Through the unequal thickness design of the blades, air disturbance can be effectively suppressed, the generation of eddy currents can be reduced, and a larger air volume can be generated at the same rotation speed.

[0004] The technical solution of the utility model is: it includes a hub, and a plurality of fan blades extending radially outward along the outer circumference of the hub, each of the fan blades includes a first arc segment and a second arc segment along the extension direction, the first arc segment is connected to the hub, and the thickness of the second arc segment in the extension direction is not equal to the thickness of the first arc segment in the extension direction.

[0005] A further technical solution is that the first arc segment and the second arc segment are both arc-shaped in the extension direction, and the concave surfaces of the first arc segment and the second arc segment face in opposite directions.

[0006] A further technical solution is that the thickness of the second arc segment in the extension direction is greater than the thickness of the first arc segment in the extension direction.

[0007] A further technical solution is that the second arc segment has unequal thickness in the extension direction, and includes a widening segment, the widening segment is transitionally connected to the first arc segment, and the thickness of the widening segment gradually increases through the transition arc surface.

[0008] A further technical solution is that the second arc segment also includes a narrowing segment transitionally connected to the widening segment, and the thickness of the narrowing segment is gradually reduced through the transition arc surface.

[0009] A further technical solution is: it also includes a connecting ring, and the connecting ring is connected to the second arc segment of each of the fan blades.

[0010] A further technical solution is that the thickness of the fan blade at the intersection of the widening section and the narrowing section ranges from 0.3 mm to 1.8 mm.

[0011] A further technical solution is that a wind inlet angle r is formed between the tangent of each blade at the hub connection and the tangent of the hub outer circle B at each connection, and the wind inlet angle r has a value range of 30° to 70°.

[0012] A further technical solution is that an outlet angle R is formed between the tangent of each blade at the connection point of the connecting ring and the tangent of the connecting ring outer circle C at each connection point, and the outlet angle R has a value range of 60° to 140°.

[0013] A further technical solution is that the hub and the fan blades are integrally injection molded.

[0014] The beneficial technical effect of the utility model is as follows: by thickening the second arc segment of the fan blade, the airflow can be made smoother, and the disturbance of the surrounding air when the fan blade rotates can be reduced, thereby reducing the turbulence and irregular airflow caused by the disturbed airflow, thereby improving the aerodynamic characteristics; and the second arc segment with increased thickness can reduce the generation of vortices; the smooth flow of air increases the airflow passing through the impeller, thereby improving the overall efficiency and output air volume of the equipment; reducing the generation of air disturbances and vortices can significantly improve aerodynamic noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the partial structure of the fan blade of the utility model;

[0017] Figure 3 It is a schematic diagram of the wind inlet angle and the wind outlet angle of the utility model;

[0018] in:

[0019] r, wind inlet angle; R, wind outlet angle; B, hub outer circumference; C, connecting ring outer circumference;

[0020] 1. Hub; 2. Blades; 21. Windward side; 22. Leeward side; 2-1. First arc segment; 2-2. Second arc segment; 2-21. Widening segment; 2-22. Narrowing segment; 3. Connecting ring. DETAILED DESCRIPTION

[0021] In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0022] like Figure 1As shown, the utility model describes an impeller with blades of unequal thickness, comprising a hub 1, and a plurality of blades 2 extending radially outward along the outer circumference of the hub 1, and also comprising a connecting ring 3, wherein the first ends of the blades 2 are evenly arranged and connected to the outer circumference of the hub 1, and the second ends of the blades 2 away from the hub 1 are connected to the connecting ring 3, and the spacing between two adjacent blades 2 gradually increases from the first end to the second end, and each blade 2 forms a windward surface 21 located in front in the driving rotation direction and a leeward surface 22 relative to the windward surface 21.

[0023] like Figure 2 As shown, each of the blades 2 includes a first arc segment 2-1 and a second arc segment 2-2 along the extension direction, the first arc segment 2-1 and the second arc segment 2-2 are both arc-shaped in the extension direction, and the concave surfaces of the first arc segment 2-1 and the second arc segment 2-2 face opposite directions. The first arc segment 2-1 is close to the hub 1, and the first arc segment 2-1 and the second arc segment 2-2 are connected by a transition arc surface.

[0024] The driving rotation direction of the fan blade 2 is not limited. Figure 3 For example, when the hub 1 and the fan blades 2 are driven to rotate in the clockwise direction, a wind inlet angle r is formed between the tangent of the windward surface 21 of each fan blade 2 at the connection with the hub 1 and the tangent of the hub outer circle B at that location. Preferably, the wind inlet angle r is in the range of 30° to 70°. The second end of each fan blade 2 is located on the same connecting ring outer circle C, and a wind outlet angle R is formed between the tangent of the windward surface 21 of each fan blade 2 at the connection with the connecting ring 3 and the tangent of the connecting ring outer circle C at that location. The wind outlet angles R of each fan blade 2 are equal. Preferably, the wind outlet angle R is in the range of 60° to 140°.

[0025] Furthermore, the thickness of the first arc segment 2 - 1 in the extension direction is equal. Preferably, the thickness of the first arc segment 2 - 1 ranges from 0.1 mm to 1.0 mm.

[0026] Furthermore, the thickness of the second arc segment 2-2 in the extension direction is not equal. Specifically, the second arc segment 2-2 includes a transitionally connected widening segment 2-21 and a narrowing segment 2-22. The widening segment 2-21 is transitionally connected to the first arc segment 2-1, and the thickness of the widening segment 2-21 gradually increases through the transition arc surface, and the thickness of the narrowing segment 2-22 gradually decreases through the transition arc surface. The maximum thickness of the fan blade 2 is formed at the intersection of the widening segment 2-21 and the narrowing segment 2-22. The thickened portion of the second arc segment 2-2 adopts a streamlined design to further optimize the airflow path, reduce wind resistance, and improve aerodynamic efficiency.

[0027] When the fan blade 2 is driven to rotate, a pressure difference is generated between the windward surface 21 and the leeward surface 22, causing the airflow on the windward surface 21 to bypass the second end of the fan blade 2 and flow into the leeward surface 22, which not only destroys the two-dimensional flow at the second end of the fan blade 2, but also generates eddies. By designing the fan blade 2 to increase the thickness of the second arc segment 2-2, the thickened blade tip can effectively smooth the airflow, reduce the disturbance of the surrounding air during the driving rotation process, and thus reduce the generation of eddies. Since the air flow is more stable, the amount of airflow passing through the impeller increases, thereby improving the overall efficiency and output air volume of the device, improving the aerodynamic performance of the fan blade 2, and reducing the rotation noise of the fan blade 2.

[0028] The range of thickness increase of the second arc segment 2-2 can be adjusted according to actual needs. Preferably, the thickness of the fan blade 2 at the intersection of the widening segment 2-21 and the narrowing segment 2-22 is in the range of 0.3mm to 1.8mm.

[0029] The connecting ring 3 is located at the side edge of the blade surface at the second end of the fan blade 2. The connecting ring 3 is used to provide connection and support between the fan blades 2, thereby improving the overall structural strength of the impeller. At the same time, it can reduce the useless vibration of the fan blade 2 to a certain extent to achieve a noise reduction function.

[0030] In this embodiment, the hub 1, the fan blades 2 and the connecting ring 3 are integrally injection molded.

[0031] Therefore, the thickness of the second end of the blade 2 is increased by design. For impellers of the same size, the increase in the thickness of the second end of the blade 2 does not affect the number of impeller blades 2. In comparison, the improved impeller generates more air volume at the same speed, has higher aerodynamic performance and lower noise.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. An impeller with blades of unequal thickness, comprising a hub (1), and a plurality of blades (2) extending radially outwardly along the outer circumference of the hub (1), characterized in that: Each of the fan blades (2) comprises a first arc segment (2-1) and a second arc segment (2-2) along the extension direction, the first arc segment (2-1) is connected to the hub (1), and the thickness of the second arc segment (2-2) in the extension direction is not equal to the thickness of the first arc segment (2-1) in the extension direction.

2. The impeller with blades of unequal thickness according to claim 1, characterized in that: The first arc segment (2-1) and the second arc segment (2-2) are both arc-shaped in the extension direction, and the concave surfaces of the first arc segment (2-1) and the second arc segment (2-2) face in opposite directions.

3. The impeller with blades of unequal thickness according to claim 1, characterized in that: The thickness of the second arc segment (2-2) in the extension direction is greater than the thickness of the first arc segment (2-1) in the extension direction.

4. The impeller with blades of unequal thickness according to claim 3, characterized in that: The second arc segment (2-2) has an unequal thickness in the extension direction, and comprises a widening segment (2-21), wherein the widening segment (2-21) is transitionally connected to the first arc segment (2-1), and the thickness of the widening segment (2-21) gradually increases through a transition arc surface.

5. The impeller with blades of unequal thickness according to claim 4, characterized in that: The second arc segment (2-2) further comprises a narrowing segment (2-22) transitionally connected to the widening segment (2-21), and the thickness of the narrowing segment (2-22) is gradually reduced through the transition arc surface.

6. The impeller with blades of unequal thickness according to claim 1, characterized in that: It also comprises a connecting ring (3), wherein the connecting ring (3) is connected to the second arc segment (2-2) of each of the fan blades (2).

7. The impeller with blades of unequal thickness according to claim 5, characterized in that: The thickness of the fan blade (2) at the intersection of the widening section (2-21) and the narrowing section (2-22) ranges from 0.3 mm to 1.8 mm.

8. The impeller with blades of unequal thickness according to claim 1, characterized in that: A wind entry angle (r) is formed between a tangent line at the connection point of the fan blade (2) with the hub (1) and a tangent line at the hub outer circumference (B) where the hub (1) is located. The wind entry angle (r) has a value range of 30° to 70°.

9. The impeller with blades of unequal thickness according to claim 6, characterized in that: An air outlet angle (R) is formed between the tangent line at the connection point between the fan blade (2) and the connecting ring (3) and the tangent line of the connecting ring outer circumference circle (C) where the connecting ring (3) is located. The air outlet angle (R) has a value range of 60° to 140°.

10. The impeller with blades of unequal thickness according to claim 1, characterized in that: The wheel hub (1) and the fan blades (2) are integrally injection-molded.

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