Axial flow fan impeller and axial flow fan using the same

Abstract

The utility model discloses an axial flow fan impeller and its applied axial flow fan, including hub and a plurality of blades, the blade includes pressure surface and suction surface, and pressure surface and suction surface are surrounded by blade root, outer edge, leading edge and trailing edge, and the blade root is connected with the hub, and the thickness of leading edge gradually increases from outside to inside, can reduce the impeller leading edge and the impact area of air, improve the aerodynamic performance, reduce air resistance, improve the fan efficiency.

Description

Technical Field

[0001] This utility model relates to an axial flow fan impeller and its application in axial flow fans. Background Technology

[0002] An axial flow fan mainly consists of a guide vane, a motor, and an impeller. Under the rotation of the impeller, the axial flow fan performs work on the gas, increasing its pressure. The gas enters through the impeller's suction side and is discharged into the atmosphere through the impeller's pressure side. As the directly working component of the fan, the impeller's design directly affects the fan's performance, including its outlet pressure, air velocity, noise level, and efficiency.

[0003] Regardless of whether the impeller leading edge of existing wind turbines is arc-shaped or curved, its cross-section is circular arc-shaped, resulting in a large cross-section that comes into contact with the airflow. This causes a significant impact on the airflow, which reduces the efficiency of the wind turbine and generates considerable noise pollution. Summary of the Invention

[0004] The purpose of this utility model is to provide an axial flow fan impeller and an axial flow fan of the same application, which solves the technical problem that in the prior art, the impeller leading edge of existing fans, whether arc-shaped or curved, has a circular arc cross-section, and the cross-section in contact with the airflow is large, which will have a large impact on the airflow, thereby reducing the efficiency of the fan and generating greater noise pollution.

[0005] The technical solution of this utility model is implemented as follows:

[0006] This utility model provides an axial flow fan impeller, including a hub and several blades. The blades include a pressure surface and a suction surface, which are formed by the blade root, outer edge, leading edge and trailing edge. The blade root is connected to the hub, and the thickness of the leading edge gradually increases from the outside to the inside.

[0007] The cross-section of the leading edge is shaped like the head of a sailfish.

[0008] The thickness gradually increases from the leading edge to the middle of the blade, and gradually decreases from the middle of the blade to the trailing edge.

[0009] An axial flow fan includes a motor and an impeller mounted on the motor, wherein the impeller is the axial flow fan impeller described above.

[0010] Compared with the prior art, this utility model has the following advantages:

[0011] 1. An axial flow fan impeller, comprising a hub and a plurality of blades, wherein the blades include a pressure surface and a suction surface, the pressure surface and the suction surface being formed by a blade root, an outer edge, a leading edge and a trailing edge, the blade root being connected to the hub, characterized in that: the thickness of the leading edge gradually increases from the outside to the inside, which can reduce the impact area between the impeller leading edge and the air, improve aerodynamic performance, reduce air resistance and improve fan efficiency.

[0012] 2. Other advantages of this utility model are described in detail in the embodiment section of the specification. Attached Figure Description

[0013] Figure 1 A perspective view provided for this utility model;

[0014] Figure 2 A front view provided for this utility model;

[0015] Figure 3 for Figure 2 Sectional view of AA;

[0016] Figure 4 for Figure 3 A magnified view of part B in the image;

[0017] Figure 5 This is a structural schematic diagram of the present invention;

[0018] Figure 6 for Figure 5 A schematic diagram of one of the blades flattened after the cylindrical cross-section in the middle (dashed line). Detailed Implementation

[0019] 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, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] Example 1:

[0021] like Figures 1 to 6 As shown, this embodiment provides an axial flow fan impeller, including a hub 2 and several blades 1. Each blade 1 includes a pressure surface 13 and a suction surface 14, which are formed by a blade root 11, an outer edge 12, a leading edge 15, and a trailing edge 16. The blade root 11 is connected to the hub 2. The characteristic feature is that the thickness of the leading edge 15 gradually increases from the outside to the inside, which can reduce the impact area between the impeller leading edge and the air, improve aerodynamic performance, reduce air resistance, and improve fan efficiency.

[0022] The cross-section of the leading edge 15 is shaped like the head of a sailfish, and the use of biomimetic technology effectively reduces the flow-induced noise of the impeller.

[0023] The thickness gradually increases from the leading edge 15 towards the middle of the blade 1, and gradually decreases from the middle of the blade 1 towards the trailing edge 16. This can reduce the impact area between the impeller leading edge and the air, improve aerodynamic performance, reduce air resistance, and increase fan efficiency.

[0024] like Figure 6 As shown, the pressure surface 13 consists of three line segments, namely L1, L2 and L3. The coordinates of the connection point A between L1 and L2 are (214, 125), and the coordinates of the connection point B between L2 and L3 are (221, 125.6). The pressure surface 13 and the suction surface 14 are symmetrical about the center line Z1. The impeller leading edge is designed to resemble the shape of a sailfish's head. At the same time, the thickness of the impeller leading edge is determined by numerical simulation. This combines bionics with the principles of controlling horseshoe vortices, suppressing boundary layer development, and reducing losses. The streamlined body of marine animals (such as dolphins and sailfish), especially the streamlined head of the sailfish, can effectively reduce resistance and losses during forward movement. This is applied to the leading edge treatment of the impeller in turbomachinery.

[0025] Example 2:

[0026] An axial flow fan includes a motor and an impeller mounted on the motor, characterized in that: the impeller is the axial flow fan impeller described in Embodiment 1.

[0027] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited thereto. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model are equivalent substitutions and are included within the protection scope of the present utility model.

Claims

1. An axial flow fan impeller, comprising a hub (2) and a plurality of blades (1), wherein each blade (1) comprises a pressure surface (13) and a suction surface (14), the pressure surface (13) and the suction surface (14) being formed by a blade root (11), an outer edge (12), a leading edge (15) and a trailing edge (16), the blade root (11) being connected to the hub (2), characterized in that: The thickness of the leading edge (15) gradually increases from the outside to the inside.

2. The axial flow fan impeller according to claim 1, characterized in that: The cross section of the leading edge (15) is shaped like the head of a sailfish.

3. An axial flow fan impeller according to claim 1 or 2, characterized in that: The thickness gradually increases from the leading edge (15) towards the middle of the blade (1), and gradually decreases from the middle of the blade (1) towards the trailing edge (16).

4. An axial flow fan, comprising a motor and an impeller mounted on the motor, characterized in that: The impeller is the axial flow fan impeller as described in any one of claims 1 to 3.

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