Axial flow fan and air conditioner comprising same

Abstract

The utility model provides an axial flow fan which comprises a cylinder portion and a plurality of fan blades evenly arranged on the side wall of the cylinder portion, each fan blade is of an irregular fan-shaped structure, each fan blade is provided with a first bent edge, a second bent edge, an inner periphery and an outer periphery, the inner periphery is connected with the cylinder portion, the outer periphery is in an arc shape, and the first bent edge is connected with the second bent edge. And an arc-shaped notch is formed in the second bent edge, and the depth of the notch is 30 mm-50 mm, so that the problems that the comprehensive indexes such as the air volume, the noise, the cost and the strength of an existing axial flow fan are difficult to balance, and the comprehensive performance is difficult to achieve are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning equipment, and in particular to an axial flow fan and an air conditioner comprising the same. Background Art

[0002] Axial flow fans are important components in air-conditioning systems. In order to achieve air circulation and remove heat from the condenser, the outdoor unit of the air conditioner generally uses a motor to drive the axial flow fan to rotate. Air flows in from the front of the blades, is pressurized at the blades, and is blown out from behind the blades.

[0003] The design of axial flow fans involves the air volume and air duct noise of the air conditioner outdoor unit. Increasing the air volume of the outdoor unit can improve the system's energy efficiency and help improve the performance of the air conditioning system. The axial flow fan rotates at high speed during the operation of the outdoor unit, which will produce airflow noise and low-frequency noise problems. At present, the design of most air conditioner outdoor unit axial flow fans is difficult to achieve optimal comprehensive indicators such as air volume, noise, cost, and strength. In addition, a large number of prototype experimental tests are performed for trial and error analysis during the design process. The design lacks direction, resulting in difficulty in optimization and a long development cycle. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an axial flow fan and an air conditioner comprising the same, which solves the problem that the blades of the existing axial flow fans in the prior art are difficult to balance the comprehensive indicators such as air volume, noise, cost, strength, etc., and it is difficult to achieve a comprehensive optimization.

[0005] According to an embodiment of the utility model, an axial flow fan comprises: a cylindrical portion and a plurality of blades evenly arranged on the side wall of the cylindrical portion, each of the blades is an irregular fan-shaped structure, each blade has a first curved edge, a second curved edge, an inner peripheral edge and an outer peripheral edge, the inner peripheral edge is connected to the cylindrical portion, the outer peripheral edge is arc-shaped, an arc-shaped notch is arranged on the second curved edge, and the depth of the notch is 30mm-50mm.

[0006] Compared with the prior art, the utility model has the following beneficial effects: by setting an arc-shaped notch on the second curved edge of the fan blade to reduce the weight of the fan blade, the power of the axial flow fan is reduced, and the efficiency is improved. At the same time, the preferred notch depth is 30mm-50mm, which not only ensures the air volume of the axial flow fan, but also reduces the weight of the entire axial flow fan, reduces the production cost of the axial flow fan, reduces the power of the axial flow fan, and improves the energy efficiency of the system.

[0007] Preferably, the radius R of the notch is greater than 30°.

[0008] Furthermore, the front side of each of the fan blades is a smooth curved surface, the back side of each of the fan blades is a stepped shape, and the thickness of the fan blades decreases gradually from the inner periphery to the outer periphery.

[0009] Preferably, the thickness of each of the fan blades is in the range of 2 mm to 5 mm.

[0010] Preferably, the sum of the projected areas of the plurality of blades in the axial direction is greater than 55% of the area of ​​a circle with the same diameter.

[0011] Preferably, the angle between the outer periphery of the fan blade and the horizontal plane is 23°-27°.

[0012] Furthermore, a mounting column is vertically arranged at the exact center of the cylindrical portion, and a mounting hole for connecting to an output end of an external motor is arranged at the axis of the mounting column.

[0013] Preferably, the distance A from the center of each notch to the axis of the mounting hole is between 82% and 87% of the distance B from the outer periphery of the fan blade to the axis of the mounting hole.

[0014] Furthermore, a plurality of reinforcing ribs are provided between the side wall of the mounting column and the inner wall of the cylindrical portion.

[0015] An air conditioner comprises the axial flow fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0017] Figure 2 FIG. 4 is a top view of the axial flow fan.

[0018] Figure 3 This is the rear view of the axial-flow fan.

[0019] Figure 4 This is a side view of the axial flow fan.

[0020] In the above drawings: 1. cylindrical portion; 2. fan blades; 3. first curved edge; 4. second curved edge; 5. outer periphery; 6. inner periphery; 7. notch; 8. curved surface; 9. mounting column; 10. mounting hole; 11. reinforcing ribs. DETAILED DESCRIPTION

[0021] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1-Figure 4 As shown, an embodiment of the utility model proposes an axial flow fan, comprising: a cylindrical portion 1 and a plurality of blades 2 evenly arranged on the side wall of the cylindrical portion 1, each of the blades 2 is an irregular fan-shaped structure, each blade 2 has a first curved edge 3, a second curved edge 4, an inner peripheral edge 6 and an outer peripheral edge 5, the inner peripheral edge 6 is connected to the cylindrical portion 1, the outer peripheral edge 5 is arc-shaped, and an arc-shaped notch 7 is provided on the second curved edge 4, and the depth of the notch 7 is 30mm-50mm.

[0023] An arc-shaped notch 7 is provided on the second curved edge 4 of the blade 2 to reduce the weight of the blade 2. The depth of the notch 7 is preferably 30 mm-50 mm. This reduces the weight of the entire axial fan while ensuring the air volume of the axial fan, thereby reducing the production cost of the axial fan, reducing the power of the axial fan, and improving the energy efficiency of the system.

[0024] Specifically, the radius R of the notch 7 of the blade 2 is preferably greater than 30°.

[0025] Further, such as Figure 3 As shown, the front side of each of the fan blades 2 is a smooth curved surface 8, the back side of each of the fan blades 2 is a stepped shape, and the thickness of the fan blades 2 decreases gradually from the inner periphery 6 to the outer periphery 5. The back side of the fan blades 2 is designed to be in a stepped shape, which ensures the strength of the fan blades 2 while further reducing the weight of the fan blades 2, thereby further reducing the production cost of the axial flow fan; at the same time, the preferred thickness range of the fan blades 2 is between 2mm and 5mm.

[0026] Furthermore, in order to ensure the air volume of the axial flow fan, the sum of the projected areas of the plurality of blades 2 in the axial direction is greater than 55% of the area of ​​a circle with the same diameter.

[0027] like Figure 4 As shown, the angle between the outer periphery 5 of the fan blade 2 and the horizontal plane is 23°-27°, which further increases the air volume of the fan blade 2 and also reduces the noise generated by the axial flow fan during operation.

[0028] like Figure 1 As shown, a mounting column 9 is vertically arranged at the center of the cylindrical portion 1, a mounting hole 10 for connecting to an external motor output end is arranged at the axis of the mounting column 9, and a plurality of reinforcing ribs 11 are arranged between the side wall of the mounting column 9 and the inner wall of the cylindrical portion 1 to improve the strength of the axial flow fan.

[0029] Preferably, the distance A from the center of each notch 7 to the axis of the mounting hole 10 is between 82% and 87% of the distance B from the outer periphery 5 of the fan blade 2 to the axis of the mounting hole 10 .

[0030] The utility model also provides an air conditioner, comprising the axial flow fan, thereby reducing the production cost of the air conditioner and also reducing the noise of the axial flow fan during operation.

[0031] As shown in the following table, it is a comparison chart of the air volume and power of axial flow fans with different angles between the outer periphery of the fan blade and the horizontal plane. It can be seen that in Scheme 1, when the angle is 20, the air volume of the axial flow fan is only 2208, and the power is 28.12. Compared with the angle range of 23°-27°, it does not have advantages in air volume and power (large air volume and low power indicate high efficiency of the axial flow fan); in Scheme 7, when the angle is 29, the air volume of the axial flow fan is only 2383, while the air volume of Scheme 6 is 2370. If the angle is further increased, the air volume will not increase significantly, but the power will increase significantly. Therefore, considering the air volume and power of the axial flow fan, the optimal range of the angle between the outer periphery of the fan blade and the horizontal plane should be 23°-27°.

[0032] Air volume power Angle Solution 1 2208 28.12 20° Solution 2 2300 28.16 23° Solution 3 2321 29.2 24° Solution 4 2332 30.2 25° Solution 5 2342 30.4 26° Solution 6 2370 30.8 27° Solution 7 2383 33.2 29°

[0033] As shown in the following table, the test results of air volume and power for different notch depths of fan blades are shown; it can be seen that the air volume of schemes 1, 2, 6, and 7 is around 2200, while the air volume of schemes 3-5 is around 2400, that is, when the notch depth is 30mm-50mm, the air volume of the axial flow fan is optimal, and the power is also similar to other schemes.

[0034]

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An axial flow fan, comprising: A cylindrical portion (1) and a plurality of fan blades (2) uniformly arranged on the side wall of the cylindrical portion (1), wherein each of the fan blades (2) is an irregular fan-shaped structure, each of the fan blades (2) has a first curved edge (3), a second curved edge (4), an inner peripheral edge (6) and an outer peripheral edge (5), the inner peripheral edge (6) is connected to the cylindrical portion (1), the outer peripheral edge (5) is arc-shaped, and an arc-shaped notch (7) is arranged on the second curved edge (4), and the depth of the notch (7) is 30 mm-50 mm.

2. An axial flow fan as claimed in claim 1, characterized in that: The rounded corner R of the notch (7) is greater than 30°.

3. An axial flow fan as claimed in claim 1, characterized in that: The front side of each of the fan blades (2) is a smooth curved surface (8), the back side of each of the fan blades (2) is in a stepped shape, and the thickness of the fan blades (2) decreases in sequence from the inner periphery (6) to the outer periphery (5).

4. An axial flow fan as claimed in claim 3, characterized in that: The thickness of each of the fan blades (2) is in the range of 2 mm to 5 mm.

5. An axial flow fan according to claim 1, characterized in that: The sum of the projection areas of the plurality of blades (2) in the axial direction is greater than 55% of the area of ​​a circle with the same diameter.

6. An axial flow fan according to claim 1, characterized in that: The angle between the outer peripheral edge (5) of the fan blade (2) and the horizontal plane is 23°-27°.

7. An axial flow fan according to claim 1, characterized in that: A mounting column (9) is vertically arranged at the exact center of the cylindrical portion (1), and a mounting hole (10) for connecting to an output end of an external motor is arranged at the axis of the mounting column (9).

8. An axial flow fan as claimed in claim 7, characterized in that: The distance A from the center of each notch (7) to the axis of the mounting hole (10) is between 82% and 87% of the distance B from the outer periphery (5) of the fan blade (2) to the axis of the mounting hole (10).

9. An axial flow fan as claimed in claim 7, characterized in that: A plurality of reinforcing ribs (11) are provided between the side wall of the mounting column (9) and the inner wall of the cylindrical portion (1).

10. An air conditioner, characterized in that: It comprises an axial flow fan as described in any one of claims 1 to 9.

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