Axial flow fan impeller based on quadratic function curve modeling and axial flow fan

Abstract

The utility model discloses an axial flow fan impeller based on quadratic function curve modeling and an axial flow fan, and provides the axial flow fan impeller based on quadratic function curve modeling on one hand, and the axial flow fan comprising the axial flow fan impeller based on quadratic function curve modeling on the other hand. The front edge curve and the rear edge curve of the sweep-forward blade of the axial flow fan impeller are limited between the two quadratic function curves, so that the efficiency of the axial flow fan impeller is improved, and the noise is reduced.

Description

Technical Field

[0001] The utility model relates to an axial flow fan impeller and an axial flow fan based on quadratic function curve modeling. Background Art

[0002] Axial flow fans are often used to dissipate heat in chillers of outdoor units of air conditioners. The high-efficiency and low-noise design can improve energy utilization and reduce the impact of noise on people's lives. The design of curved and swept blades helps to optimize the flow field in axial flow machinery and improve the performance of the equipment. For example, curved and swept blades are suitable for scenarios that require a large amount of airflow transmission, reduce fan noise and energy consumption, such as air-conditioning systems, industrial ventilation, and aerospace fields. At the same time, in ordinary ventilation and heat dissipation occasions, curved and swept blades can be selected to achieve better ventilation and heat dissipation effects. The blade design of axial flow fans is inherited from aviation wings. The leading and trailing edges of the existing axial flow fan blades are generally a straight line or an arc. Summary of the invention

[0003] In view of the deficiencies existing in the above problems, the utility model provides an axial flow fan impeller and an axial flow fan based on quadratic function curve modeling.

[0004] On the one hand, the utility model provides an axial flow fan impeller based on quadratic function curve modeling, comprising:

[0005] a hub portion, the hub portion being driven to rotate by a motor;

[0006] A plurality of forward-swept blades, wherein the plurality of forward-swept blades are radially mounted on the hub and deliver air in the direction of the rotation axis;

[0007] Each of the forward-swept blades is divided into a first area starting from the hub toward the outer periphery and a second area connected to the first area and extending from the first area to the outermost periphery of the forward-swept blade; specifically, the size of the hub is set to R1, the outer edge profile size of the forward-swept blade is set to R2, the radius of the curve size dividing the first area and the second area is set to R3, and 0.7R1+0.3R2≤R3≤0.5 R1+0.5 R2;

[0008] In addition, the leading edge curve of the forward-swept blade is limited to between two quadratic function curves, which is divided into function y=-0.0024x 2 +1.399x-118.18 and the function y=-0.0024x 2 +1.399x-136.8, limiting the trailing edge curve of the forward-swept blade between two quadratic function curves, which are function y=-0.0013x 2 +0.8203x+139.0 and the function y=-0.0013x 2 +0.8203x+120.1.

[0009] Furthermore, the forward-swept blade is provided with a balancing plate slot in the first region, and the balancing plate slot is arranged close to the leading edge curve.

[0010] Furthermore, a serrated edge is formed on the trailing edge curve, and the serrated edge is arranged close to a side of the second region.

[0011] Furthermore, the outer edge of the forward-swept blade has a top wing formed by a protrusion.

[0012] On the other hand, the utility model provides an axial flow fan, including an axial flow fan impeller based on a quadratic function curve modeling, and also including an EC outer rotor motor, a mesh cover, and a wind cylinder. The axial flow fan impeller is fixed on the rotor of the EC outer rotor motor, and the mesh cover and the wind cylinder are fixed to the stator of the EC outer rotor motor by fasteners.

[0013] The beneficial effects of the utility model compared with the prior art are:

[0014] 1. A quadratic function curve is used to fit the leading and trailing edges of the blade to ensure a smooth curve. During the rotation of the blade, the leading edge interacts with the airflow at different circumferential angles to make the airflow distribution more uniform and reduce flow losses. This design helps to improve the shock wave intensity at the blade tip and the accumulation of secondary flow in the blade tip area, and has the characteristics of large stall margin and high peak efficiency.

[0015] 2. The trailing edge curve is serrated. The serrated shape can change the shedding position of the wake vortex in each section, increase the distance between the vortex centers, suppress the disturbance of the shedding vortex to the wake flow, and thus reduce the unsteady pressure pulsation on the blade surface and the aerodynamic noise caused by the wake vortex. In addition, the serrated design of the trailing edge curve can also reduce the noise generated by the vortex in the trailing edge area of ​​the blade. This type of noise presents broadband characteristics in the frequency domain. By adding serrations to the trailing edge of the airfoil, the far-field aerodynamic noise in the medium and low frequency bands can be reduced without basically affecting the aerodynamic performance of the airfoil. This noise reduction effect is particularly significant in the atmosphere because the transmission distance of low-frequency noise is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the axial flow fan impeller based on the quadratic function curve modeling (the arrow indicates the direction of rotation);

[0017] Figure 2 for Figure 1 Schematic diagram in the XOY plane;

[0018] Figure 3 is a schematic diagram of one of the forward-swept blades on the Cartesian coordinate axis;

[0019] Figure 4is a schematic diagram of a quadratic function that defines a leading edge curve and a trailing edge curve;

[0020] Figure 5 is a schematic diagram of one of the forward-swept blades;

[0021] Figure 6 is a three-dimensional diagram of the axial flow fan involved;

[0022] Figure 7 for Figure 6 Exploded diagram.

[0023] In the figure: 1, hub; 2, forward-swept blades; 21, leading edge curve; 22, trailing edge curve; 23, balance plate slot; 24, serrated edge; 25, top wing; A, first area; B, second area; 3, EC outer rotor motor; 4, wind tube; 5, mesh cover;

[0024] In addition: R1 is the radius of the hub; R2 is the maximum radius of the outer contour of the forward-swept blade; and R3 is the radius of the boundary line between the first area and the second area. DETAILED DESCRIPTION

[0025] The axial flow fan impeller and axial flow fan based on quadratic function curve modeling involved in this solution are mainly used in the air cooling and heat dissipation environment of air conditioning heat pump units.

[0026] Figure 6 The schematic diagram of the axial flow fan is given. The axial flow fan impeller is fixed to the EC outer rotor motor by bolts. The axial flow fan impeller rotates clockwise, and the airflow enters from the front side of the wind tube and is discharged from the mesh cover on the rear side of the wind tube.

[0027] Axial fan impeller structure Figure 1 As shown, a Cartesian coordinate system is established with the axis of the axial flow fan impeller as the origin, and the leading edge curve 21 and the trailing edge curve 22 of a single forward-swept blade 2 are extracted, which are expressed in the Cartesian coordinate system as follows: Figure 3 .

[0028] The equations of the leading edge curve 21 and the trailing edge curve 22 are standardized by the axial projection of the extracted forward-swept blade 2:

[0029] S1, such as Figure 4 As shown, the leading edge curve 21 and the trailing edge curve 22 of the forward-swept blade 2 are defined by dashed lines, respectively, and these dashed lines can be represented by the function y=ax 2The leading edge curve 21 is in the middle range of the upper and lower quadratic function curves, which are (a=-0.0024, b=1.399, c=-118.18) and (a=-0.0024, b=1.399, c=-136.8), and the trailing edge curve 22 is in the middle range of the upper and lower quadratic function curves, which are (a=-0.0013, b=0.8203, c=139.0) and (a=-0.0013, b=0.8203, c=120.1).

[0030] S2, Figure 3 The axial projection area of ​​the forward-swept blade 2 is given, and the starting points of the leading edge curve 21 and the trailing edge curve 22 intersect with the hub 1 (radius R1), and the end points intersect with the outer edge contour (radius R2) of the forward-swept blade 2.

[0031] S3, single forward-swept blade 2 can be pressed Figure 5 The scheme shown is structurally designed, and the area of ​​the swept blade 2 is divided into two parts by a curve with a radius of R3. A balancing plate slot 23 is provided in the first area A, and the balancing plate slot 23 is arranged close to the leading edge curve 21. A serrated edge 24 is formed on the trailing edge curve 22, and the serrated edge 24 is located on the boundary of the second area B. Among them, R3 satisfies (0.7R1+0.3R2)≤R3≤(0.5 R1+0.5 R2). The outer edge of the swept blade 2 has a raised top wing 25.

[0032] The number of the forward-swept blades 2 is 4 to 6. The forward-swept blades 2 can be designed as an integral part with the hub 1 and manufactured by integral injection molding. The overall shape is as follows: Figure 1 shown.

[0033] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An axial flow fan impeller based on quadratic function curve modeling, comprising: A hub (1), the hub (1) being driven to rotate by a motor; A plurality of forward-swept blades (2), wherein the plurality of forward-swept blades (2) are radially mounted on the hub (1) and deliver air in the direction of the rotation axis; Features: Each of the forward-swept blades (2) is divided into a first region (A) starting from the hub (1) toward the outer periphery and a second region (B) connected to the first region (A) and extending from the first region (A) to the outermost periphery of the forward-swept blade (2); specifically, the size of the hub (1) is set to R1, the outer edge profile size of the forward-swept blade (2) is set to R2, the radius of the curve size dividing the first region (A) and the second region (B) is set to R3, and 0.7R1+0.3R2≤R3≤0.5 R1+0.5 R2; In addition, the leading edge curve (21) of the forward-swept blade (2) is defined between two quadratic function curves, which are divided into function y=-0.0024x 2 +1.399x-118.18 and the function y=-0.0024x 2 +1.399x-136.8, limiting the trailing edge curve (22) of the forward-swept blade (2) between two quadratic function curves, which are function y=-0.0013x 2 +0.8203x+139.0 and the function y=-0.0013x 2 +0.8203x+120.

1.

2. The axial flow fan impeller based on quadratic function curve modeling according to claim 1, characterized in that: The forward-swept blade (2) is provided with a balancing plate slot (23) in the first area (A), and the balancing plate slot (23) is arranged close to the leading edge curve (21).

3. The axial flow fan impeller based on quadratic function curve modeling according to claim 2, characterized in that: A serrated edge (24) is formed on the trailing edge curve (22), and the serrated edge (24) is arranged close to one side of the second area (B).

4. The axial flow fan impeller based on quadratic function curve modeling according to claim 3, characterized in that: The outer edge of the forward-swept blade (2) has a top wing (25) formed in the form of a protrusion.

5. An axial flow fan, comprising an axial flow fan impeller based on quadratic function curve modeling as claimed in any one of claims 1 to 4, characterized in that: It also comprises an EC external rotor motor (3), a mesh cover (5) and a wind tube (4); the axial flow fan impeller is fixed on the rotor of the EC external rotor motor (3); the mesh cover (5) and the wind tube (4) are fixedly connected to the stator of the EC external rotor motor (3) via fasteners.

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