A high-efficiency and low-noise axial flow fan structure

Abstract

The invention discloses a high-efficiency and low-noise axial flow fan structure, comprising a hub (1) and a plurality of blades (2) mounted on the outer side of the hub (1), characterized in that a rotating guide vane (3) extends from the blade (2), and the blade (2) is connected to the rotating guide vane (3) through a connecting piece (4); it improves the static pressure work capacity, maximum air volume and static pressure efficiency of the axial flow fan, eliminates the velocity circulation flowing out from the impeller outlet, converts the kinetic energy of the circumferential velocity of the gas into static pressure energy, and reduces noise.

Description

Technical field:

[0001] The invention relates to an axial flow fan structure with high efficiency and low noise. Background technology:

[0002] An axial flow fan is usually assembled from a plurality of blades and a hub (motor); the hub is cylindrical, and a plurality of blades are mounted on the outer surface of the hub. The general axial flow fan of this structure has the following disadvantages: low air volume and high noise. Summary of the invention:

[0003] The purpose of the present invention is to provide an axial flow fan structure with high efficiency and low noise, so as to solve the technical problems of low air volume and high noise in the axial flow fan in the prior art.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A high-efficiency and low-noise axial flow fan structure comprises a hub and a plurality of fan blades mounted on the outer side of the hub, and is characterized in that a rotating guide vane extends from the fan blade, and the fan blade is connected to the rotating guide vane through a connecting piece.

[0006] The rotating guide vane described above is in the form of a sheet, including an upper surface and a lower surface, with an air inlet portion formed at the front end of the rotating guide vane and an air outlet portion formed at the rear end of the rotating guide vane.

[0007] The upper surface and the lower surface mentioned above are convex, concave or flat.

[0008] The Gaussian curvature of the convex surface is positive, the Gaussian curvature of the concave surface is negative, and the Gaussian curvature of the plane is zero.

[0009] The air outlet portion of the rotating guide vane described above is provided with a sawtooth structure.

[0010] The rotating guide vane described above is installed near the leading edge or trailing edge of the fan blade.

[0011] The above-mentioned definition of Z axis coincides with the rotation axis of the axial flow fan, and a surface passing through the Z axis is defined as projection plane A. The maximum component of the projection of the fan blade on projection plane A on the Z axis is L, and the minimum distance between the projection of the fan blade on projection plane A and the projection of the rotating guide vane on projection plane A is X, and X satisfies 0≤X≤|2L|.

[0012] The shape of the rotating guide vane described above is an airfoil shape.

[0013] The numbers of the fan blades and rotating guide vanes mentioned above are even numbers, and the outer surface of the hub is cylindrical.

[0014] The numbers of the fan blades and rotating guide vanes mentioned above are prime numbers to each other, and the outer surface of the hub is cylindrical.

[0015] Compared with the prior art, the present invention has the following effects:

[0016] 1) The high-efficiency and low-noise axial flow fan structure of the present invention comprises a hub and a plurality of blades mounted on the outer side of the hub, characterized in that a rotating guide vane extends from the blade, and the blade is connected to the rotating guide vane through a connecting member, which has the following advantages:

[0017] A. Improve the static pressure work capacity, maximum air volume and static pressure efficiency of the axial flow fan. Eliminate the velocity circulation flowing out from the impeller outlet and convert the kinetic energy of the gas's circumferential velocity into static pressure energy;

[0018] B. Reduce noise.

[0019] 2) Other advantages of the present invention are described in detail in the embodiment section. Description of the drawings:

[0020] Figure 1 is a three-dimensional diagram of the axial flow fan structure of the present invention;

[0021] Figure 2 It is a top view of the high-efficiency and low-noise axial flow fan of the present invention with the outer cover omitted;

[0022] Figure 3 This is a schematic diagram of the structure of the present invention after omitting two fan blades and leaving one fan blade;

[0023] Figure 4 It is a structural schematic diagram of a rotating guide vane in the present invention;

[0024] Figure 5 It is a three-dimensional exploded view of the wind wheel in the present invention;

[0025] Figure 6 It is a structural schematic diagram of another rotating guide vane in the present invention. Specific implementation method:

[0026] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0027] Embodiment 1:

[0028] like Figures 1 to 4 As shown, the present invention provides an axial flow fan structure with high efficiency and low noise, including a hub 1, a plurality of blades 2 installed on the outer side of the hub 1, and a mesh cover 10, characterized in that a rotating guide vane 3 extends from the blade 2, and the blade 2 is connected to the rotating guide vane 3 through a connector 4. It improves the static pressure work capacity, maximum air volume and static pressure efficiency of the axial flow fan. It eliminates the velocity circulation flowing out from the impeller outlet, converts the kinetic energy of the circumferential velocity of the gas into static pressure energy, and reduces noise.

[0029] The rotating guide vane 3 described above is in sheet shape, including an upper surface 31 and a lower surface 32 , an air inlet 33 is formed at the front end of the rotating guide vane 3 , and an air outlet 34 is formed at the rear end of the rotating guide vane 3 .

[0030] The upper surface 31 and the lower surface 32 mentioned above are convex surfaces, concave surfaces or plane surfaces. The Gaussian curvature of the convex surface is positive, the Gaussian curvature of the concave surface is negative, and the Gaussian curvature of the plane surface is zero.

[0031] The rotating guide vane 3 mentioned above is installed near the leading edge 21 or the trailing edge 22 of the blade 2 .

[0032] The wheel hub 1 and the motor are integrated into one body, and the structure is simpler and more compact.

[0033] like Figure 5 As shown, the Z axis is defined to coincide with the rotation axis of the axial flow fan, a surface passing through the Z axis is defined as the A projection plane, the maximum component of the projection of the fan blade 2 on the A projection plane on the Z axis is L, the minimum distance between the projection of the fan blade 2 on the A projection plane and the projection of the rotating guide vane 3 on the A projection plane is X, and X satisfies 0≤X≤|2L|. This ensures the technical effect of improving the static pressure work capacity, maximum air volume and static pressure efficiency of the axial flow fan.

[0034] The shape of the rotating guide vane 3 is an airfoil shape.

[0035] The number of the blades 2 and the rotating guide vanes 3 described above are even numbers, and the outer surface of the hub is cylindrical; or the number of the blades 2 and the rotating guide vanes 3 are prime numbers, and the outer surface of the hub is cylindrical.

[0036] like Figure 6 As shown, the air outlet 34 of the rotating guide vane 3 described above is provided with a sawtooth structure 35. The sawtooth shape 35 is provided at the outlet of the rotating guide vane, so that the laminar boundary layer of the airflow on the blade can be converted into turbulent flow earlier, thereby avoiding the unstable waves in the laminar boundary layer leading to vortex separation.

[0037] The connecting member 4 may be a straight rod connecting the fan blade 2 and the rotating guide vane 3 .

[0038] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are all equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A high-efficiency and low-noise axial flow fan structure, comprising a hub (1) and a plurality of blades (2) mounted on the outer side of the hub (1), characterized in that: A rotating guide vane (3) extends from the fan blade (2), and the fan blade (2) is connected to the rotating guide vane (3) via a connecting piece (4); The rotating guide vane (3) is installed near the rear edge of the fan blade (2), and the air outlet (34) of the rotating guide vane (3) is provided with a sawtooth structure; The Z axis is defined to coincide with the rotation axis of the axial flow fan, and a surface passing through the Z axis is defined as projection plane A. The maximum component of the projection of the fan blade (2) on the projection plane A on the Z axis is L. The minimum distance between the projection of the fan blade (2) on the projection plane A and the projection of the rotating guide vane (3) on the projection plane A is X, and X satisfies 0≤X≤|2L|.

2. The high-efficiency and low-noise axial flow fan structure according to claim 1, characterized in that: The rotating guide vane (3) is in the shape of a sheet and comprises an upper surface (31) and a lower surface (32). An air inlet (33) is formed at the front end of the rotating guide vane (3), and an air outlet (34) is formed at the rear end of the rotating guide vane (3).

3. The high-efficiency and low-noise axial flow fan structure according to claim 2 is characterized in that: The upper surface (31) and the lower surface (32) are convex surfaces, concave surfaces or flat surfaces.

4. The high-efficiency and low-noise axial flow fan structure according to claim 3 is characterized in that: The Gaussian curvature of the convex surface is positive, the Gaussian curvature of the concave surface is negative, and the Gaussian curvature of the plane is zero.

5. A high-efficiency and low-noise axial flow fan structure according to claim 1, 2, 3 or 4, characterized in that: The shape of the rotating guide vane (3) is an airfoil shape.

6. The high-efficiency and low-noise axial flow fan structure according to claim 5, characterized in that: The number of the fan blades (2) and the number of the rotating guide vanes (3) are even numbers, and the outer surface of the hub is cylindrical.

7. A high-efficiency and low-noise axial flow fan structure according to claim 1, 2, 3 or 4, characterized in that: The number of the fan blades (2) and the number of the rotating guide vanes (3) are mutually prime numbers, and the outer surface of the hub is cylindrical.

Images