Axial flow fan blade structure for air conditioner

Abstract

The utility model relates to the technical field of air conditioning devices, in particular to an axial flow fan blade structure for an air conditioner, which comprises a central hub and at least three blades, all the blades are uniformly connected and arranged on the periphery of the central hub, a rotating hole is arranged in the center of the central hub, each blade comprises a front edge and a tail edge, the tail edge is provided with first noise reduction sawteeth and a V-shaped noise reduction notch, and the first noise reduction sawteeth are arranged between the V-shaped noise reduction notch and the center hub. The first noise reduction sawteeth and the V-shaped noise reduction notches can improve airflow distribution, inhibit flowing noise and effectively reduce the airflow noise; and the first noise reduction sawteeth are arranged between the V-shaped noise reduction notches and the central hub, so that the trailing edge airflow loss of the blades is reduced, the working efficiency of the fan is improved, and the energy efficiency of an air conditioning system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning devices, and in particular to an axial flow fan blade structure used for air-conditioning. Background Art

[0002] Axial flow fans are commonly used components in air-conditioning systems. The design of axial flow fans involves issues such as the air volume of the air-conditioning outdoor unit and the air duct airflow noise, so the axial flow fan blade structure is particularly important.

[0003] At present, the axial fan blade structure of the air conditioner includes a central hub and at least three blades. All the blades are evenly connected and arranged around the central hub. A rotating hole is set in the middle of the central hub. The blades include a leading edge and a trailing edge. The structure of the leading edge and the trailing edge causes high airflow noise, which affects the use of the air conditioner. Utility Model Content

[0004] The technical problem solved by the utility model is to provide an axial flow fan blade structure for air conditioning with low airflow noise.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an axial fan blade structure for an air conditioner includes a central hub and at least three blades, all of the blades are evenly connected and arranged around the central hub, a rotating hole is provided in the middle of the central hub, the blades include a leading edge and a trailing edge, a first noise reduction serration and a V-shaped noise reduction notch are provided on the trailing edge, and the first noise reduction serration is provided between the V-shaped noise reduction notch and the central hub.

[0006] Furthermore, the distance between the first noise reduction serrations and the central hub is greater than 30 mm.

[0007] Furthermore, the bottom of the V-shaped noise reduction notch is arc-shaped.

[0008] Furthermore, the depth of the V-shaped noise reduction notch is a, the width of the V-shaped noise reduction notch is b, and a / b>0.7.

[0009] Furthermore, the leading edge is an elliptical curved structure.

[0010] Furthermore, a second noise reduction serration is provided at the blade tip of the leading edge.

[0011] Furthermore, the axial fan blade structure includes three blades, the center hub is hexagonal in shape, the center hub includes three first sides and three second sides, the first sides and the second sides are arranged at intervals, and the length of the first side is greater than the length of the second side, and the blades are connected to the first side.

[0012] The beneficial effects of the present invention are as follows: a first noise reduction serration and a V-shaped noise reduction notch are provided on the trailing edge, the first noise reduction serration and the V-shaped noise reduction notch can improve the airflow distribution, suppress flow noise, and effectively reduce the airflow noise; and the first noise reduction serration is provided between the V-shaped noise reduction notch and the central hub, the first noise reduction serration and the V-shaped noise reduction notch can reduce the airflow loss at the trailing edge of the blade, improve the working efficiency of the fan, and improve the energy efficiency of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0015] Marked as: center hub 1, blade 2, rotating hole 3, leading edge 4, trailing edge 5, first noise reduction serration 6, V-shaped noise reduction notch 7, second noise reduction serration 8. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 、 Figure 2 As shown, the utility model is an axial flow fan blade structure for air conditioning, comprising a central hub 1 and at least three blades 2, all blades 2 are evenly connected and arranged around the central hub 1, a rotating hole 3 is provided in the middle of the central hub 1, the blade 2 comprises a leading edge 4 and a trailing edge 5, a first noise reduction serration 6 and a V-shaped noise reduction notch 7 are provided on the trailing edge 5, the first noise reduction serration 6 is provided between the V-shaped noise reduction notch 7 and the central hub 1, preferably, the V-shaped noise reduction notch 7 is provided close to the outer edge of the blade.

[0018] A first noise reduction serration 6 and a V-shaped noise reduction notch 7 are provided on the trailing edge 5. The first noise reduction serration 6 and the V-shaped noise reduction notch 7 can improve the airflow distribution, suppress flow noise, and effectively reduce the airflow noise; and the first noise reduction serration 6 is arranged between the V-shaped noise reduction notch 7 and the central hub 1. The first noise reduction serration 6 and the V-shaped noise reduction notch 7 can reduce the airflow loss at the trailing edge 5 of the blade 2, improve the fan working efficiency, and improve the energy efficiency of the air-conditioning system.

[0019] Specifically, in order to improve the effect of the first noise reduction serrations 6 on reducing airflow noise, the distance between the first noise reduction serrations 6 and the central hub 1 is greater than 30 mm, and the V-shaped noise reduction notch 7 is provided close to the outer edge of the blade.

[0020] In order to facilitate the processing of the V-shaped noise reduction notch 7 and improve the overall strength of the blade 2, the bottom of the V-shaped noise reduction notch 7 is arc-shaped.

[0021] Through practice and experiments, it is concluded that the deeper the depth of the V-shaped noise reduction notch 7, the better the effect of reducing airflow noise, but the lower the air volume. In order to ensure the effectiveness of the V-shaped noise reduction notch 7, the depth of the V-shaped noise reduction notch 7 is a, the width of the V-shaped noise reduction notch 7 is b, and a / b>0.7.

[0022] In order to further reduce the airflow noise, Figure 1 As shown, the leading edge 4 is an elliptical swept structure, and a second noise reduction serration 8 is provided at the tip of the leading edge 4 .

[0023] In order to realize the miniaturization and lightweight design of the center hub 1 and reduce its cost, Figure 1 As shown, the axial fan blade structure includes three blades 2, the shape of the central hub 1 is hexagonal, the central hub 1 includes three first sides and three second sides, the lengths of the three first sides are equal, the lengths of the three second sides are equal, the first sides and the second sides are spaced apart, and the length of the first side is greater than the length of the second side, and the blades 2 are connected to the first sides.

Claims

1. An axial flow fan blade structure for an air conditioner, comprising a central hub (1) and at least three blades (2), wherein all blades (2) are evenly connected and arranged around the central hub (1), a rotating hole (3) is arranged in the middle of the central hub (1), and the blade (2) comprises a leading edge (4) and a trailing edge (5), characterized in that: A first noise reduction sawtooth (6) and a V-shaped noise reduction notch (7) are provided on the trailing edge (5), and the first noise reduction sawtooth (6) is arranged between the V-shaped noise reduction notch (7) and the central hub (1).

2. The axial flow fan blade structure for air conditioning according to claim 1, characterized in that: The distance between the first noise reduction sawtooth (6) and the central hub (1) is greater than 30 mm.

3. The axial flow fan blade structure for air conditioner according to claim 1, characterized in that: The bottom of the V-shaped noise reduction notch (7) is arc-shaped.

4. The axial flow fan blade structure for air conditioner according to claim 1, characterized in that: The depth of the V-shaped noise reduction notch (7) is a, the width of the V-shaped noise reduction notch (7) is b, and a / b>0.

7.

5. The axial flow fan blade structure for air conditioner according to claim 1, characterized in that: The leading edge (4) is an elliptical curved structure.

6. The axial flow fan blade structure for air conditioner according to claim 1, characterized in that: A second noise reduction sawtooth (8) is arranged at the blade tip of the leading edge (4).

7. The axial flow fan blade structure for air conditioner according to any one of claims 1 to 6, characterized in that: The axial flow fan blade structure comprises three blades (2); the central hub (1) is in the shape of a hexagon; the central hub (1) comprises three first sides and three second sides; the first sides and the second sides are arranged at intervals, and the length of the first side is greater than the length of the second side; and the blades (2) are connected to the first sides.

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