Axial fan and fan stator

Abstract

The invention provides an axial flow fan and a fan stator, and the axial flow fan is composed of a resin axial flow fan which is independently provided with an outer ring, a hub arranged at the center of the outer ring, and a plurality of blades arranged between the outer ring and the hub. The shape of the fan and the number of blades are made appropriate to suppress sharp flow changes, thereby achieving high efficiency and rectification effect. The resin axial flow fan is provided with an outer ring, a hub disposed at the center of the outer ring, and a plurality of blades disposed between the outer ring and the hub, and is characterized in that: the blades are formed into a wide width that is longer than the actual length from the root of the hub to the middle and from the middle to the outer ring; and a structure twisted at a desired angle is formed.

Description

Technical Field

[0001] This invention relates to an axial-flow type engine cooling fan (used for cooling batteries, motors, FCV stacks, auxiliary equipment, etc. in EVs, and hereinafter simply referred to as "engine cooling fan") that is generally driven by rotation for cooling automobile engines, etc., and a fan stator for fixing the fan via an electric motor that drives the engine cooling fan. Background Technology

[0002] Axial-flow type engine cooling fans, driven by rotation, are commonly used in vehicles such as automobiles for cooling. These cooling fans require a shape that offers low noise, high efficiency, compactness, and the ability to achieve good pressure and flow rates. Therefore, various fan shapes have been proposed to achieve these requirements. For example, an axial-flow fan is known that has fan blades extending radially from the outer periphery of a cylindrical hub with a roughly T-shaped cross-section, wherein a curved surface located at the leading edge of the fan blade extends from the shaft end face to the root side of the fan blade (see Patent Document 1). However, recently, due to the demands of EVs, there has been a need for cooling fans driven by electric motors instead of the rotational power of the engine.

[0003] However, when the fan is driven by an electric motor or other rotary drive mechanism, a fan and a stator are required. The shape or structure of the fan and stator will affect the performance. Therefore, as a fan stator for fixing via an electric motor that drives the engine cooling fan, a structure is known, for example, in which axial flat plate-shaped support bars are arranged radially between the mounting member at the center and the annular outlet flare (see Patent Document 2).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 4994975

[0007] Patent Document 2: Japanese Patent Application Publication No. 2012-229693 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] However, the aforementioned conventional axial-flow engine cooling fans and stators have the following problems.

[0010] Specifically, for example, in the case of a dedicated 500W engine cooling fan, the short length of the fan blades reduces the distance required to deflect the airflow generated by the fan, resulting in pressure resistance on the blade surface and thus reducing efficiency. Furthermore, in the case of a dedicated stator for a 500W engine cooling fan, although the support bars themselves have the same cross-sectional shape as the fan blades, the mismatch between the fan outlet flow and the stator blade shape hinders the airflow generated by the fan, increasing the drive torque. Additionally, in the case of a dedicated 1kW engine cooling fan, the number of blades is typically 11. Not only does the flow generated from the front and rear blades interfere with the flow around the blades, but the short blade length also reduces the distance required to deflect the flow, generating pressure resistance on the blade surface and reducing efficiency. Moreover, in the case of a dedicated stator for a 1kW engine cooling fan, the axially flat support bars hinder the airflow generated by the fan, increasing the drive torque.

[0011] This invention was made to overcome the shortcomings of the conventional axial flow fans and fan stators mentioned above. The purpose is to provide an axial flow fan and fan stator that, in a resin axial flow fan configured with an outer ring, a hub disposed at the center of the outer ring, and multiple blades disposed between the outer ring and the hub, suppresses abrupt flow changes by appropriately adjusting the fan shape and the number of blades, thereby achieving high efficiency and rectification effects.

[0012] Solution for solving the problem

[0013] The axial fan (motor-driven fan) of the present invention is a resin fan comprising a circular outer ring, a hub composed of a circular central support body disposed at the center of the outer ring, and a plurality of blades disposed between the outer ring and the hub. The blades are characterized in that the blades recede from the root of the hub composed of the central support body to the middle and advance from the middle to the outer ring, forming a wide blade with an actual long length, and the blades are formed in a structure that twists at a desired angle.

[0014] In addition, the axial fan is characterized by a circular outer ring, a hub consisting of a circular central support, and multiple blades integrally formed.

[0015] Furthermore, the fan stator for fixing an axial flow fan (motor-driven fan) of the present invention is characterized in that the support bars arranged radially between the mounting member at the center and the annular outlet flare are formed with a blade cross-sectional shape that matches the fan outlet side vector (wind direction and air volume from the fan to the support bar), and each support bar is formed with a shape that is twisted at a desired angle in the fan rotation direction.

[0016] The effects of the invention

[0017] The axial flow fan of the present invention is a resin fan comprising an independently arranged circular outer ring, a hub composed of a circular central support body disposed at the center of the outer ring, and a plurality of blades disposed between the outer ring and the hub. The blades are formed by retracting from the root of the central support body to the middle and advancing from the middle to the outer ring, resulting in blades of actual length. Furthermore, the blades are formed with a structure twisted at a desired angle. Therefore, for example, in the case of a 500W dedicated engine cooling fan, abrupt flow changes can be suppressed to achieve high efficiency, and a rectification effect can be obtained. In addition, in the case of a 1kW dedicated engine cooling fan, abrupt flow changes can be suppressed to achieve high efficiency, similar to the 500W dedicated cooling fan, and high efficiency can be achieved by reducing the number of blades to suppress flow interference between the front and rear blades. Furthermore, by forming the fan stator struts with a blade cross-sectional shape matching the fan outlet side vector and forming each strut with a shape twisted at a desired angle in the fan rotation direction, fan performance can be improved. Attached Figure Description

[0018] Figure 1 This is a perspective view showing one embodiment of the axial fan (1KW output dedicated) of the present invention.

[0019] Figure 2 It means Figure 1 A perspective view of one embodiment of a fan stator for axial flow fans.

[0020] Figure 3 This is a perspective view of another embodiment of the present invention, an axial fan (500W output dedicated).

[0021] Figure 4 It means Figure 3 A perspective view of one embodiment of the fan stator of an axial fan.

[0022] Figure 5 This is a diagram showing a comparative example of the specific shape (including dimensions) of a conventional axial fan (specifically for 1KW output).

[0023] Figure 6 This is a diagram illustrating one embodiment of the specific shape (including dimensions) of the axial fan (1KW output dedicated) of the present invention.

[0024] Figure 7 This is a diagram showing a comparative example of the specific shape (including dimensions) of a conventional stator (specifically for 1KW output).

[0025] Figure 8 This is a diagram showing one embodiment of the specific shape (including dimensions) of the stator (for 1KW output) of the present invention.

[0026] Figure 9 This is a comparison graph (PQ performance) of the previous 1KW ring fan and the 1KW ring fan of this invention at 3050rpm (vertical axis: static pressure, horizontal axis: air volume).

[0027] Figure 10 This is a comparison chart (LQ performance) of the 1KW ring fan of the previous product and the 1KW of this invention at 3050rpm (vertical axis: horsepower, horizontal axis: air volume).

[0028] Figure 11 This is a comparison chart (EQ performance) of the previous 1KW ring fan and the 1KW ring fan of this invention at 3050rpm (vertical axis: static pressure efficiency, horizontal axis: air volume).

[0029] Figure 12 This is a diagram showing a comparative example of the specific shape (including dimensions) of a conventional axial fan (specifically for 500W output).

[0030] Figure 13 This is a diagram illustrating one embodiment of the specific shape (including dimensions) of the axial fan (500W output dedicated) of the present invention.

[0031] Figure 14 This is a diagram showing a comparative example of the specific shape (including dimensions) of a conventional stator (specifically for 500W output).

[0032] Figure 15 This is a diagram showing one embodiment of the specific shape (including dimensions) of the stator (for 500W output) of the present invention.

[0033] Figure 16 This is a comparison chart (PQ performance) of the previous 500W product and the 500W ring fan of this invention at 4100rpm (vertical axis: static pressure, horizontal axis: air volume).

[0034] Figure 17 This is a comparison chart (LQ performance) of the previous 500W and the 500W annular fan of this invention at 4100rpm (vertical axis: horsepower, horizontal axis: air volume).

[0035] Figure 18 This is a comparison chart (EQ performance) of the previous 500W product and the 500W ring fan of this invention at 4100rpm (vertical axis: static pressure efficiency, horizontal axis: air volume). Detailed Implementation

[0036] Hereinafter, an embodiment of the axial fan of the present invention will be described with reference to the accompanying drawings.

[0037] Figure 1 The axial flow fan (1kW output dedicated) 1 shown consists of a circular outer ring 11, a hub 12 composed of a circular central support body disposed at the center of the outer ring, and a plurality of blades 13 disposed between the outer ring 11 and the hub 12. Its distinguishing feature is the shape of the plurality of (9) blades 13 disposed between the outer ring 11 and the hub 12. Specifically, in the 1kW output dedicated axial flow fan of the present invention, the blades 13 are formed as blades that recede from the root of the hub 12 (composed of the central support body) to the middle and advance from the middle to the outer ring 11, with an actual length approximately 1.3 to 1.5 times longer than conventional products. Furthermore, each blade 13 is formed such that the roots at both ends are twisted at a desired angle and integrally joined to the inner surface of the outer ring 11 and the outer surface of the hub 12. Furthermore, the width, length, and tilt angle of the root at both ends of the fan blade 13 are not particularly limited, but are appropriately set according to the output of the axial fan, so as to suppress the rapid flow changes of air or wind between the fan blades 13 and achieve high efficiency.

[0038] Additionally, a stator 2 for a dedicated axial fan outputting 1KW is provided. Figure 2 As shown in one example, it consists of a circular outer ring 21, a central hub seat 22, radially arranged support bars 23 between the outer ring 21 and the hub seat 22, and a reinforcing ring 24. Its characteristic feature is that the blade-shaped support bars 23, radially arranged between the outer ring 21 and the hub seat 22, are formed such that their two ends are twisted at a desired angle and integrally bonded to the inner surface of the outer ring 21 and the outer surface of the hub seat 22. Furthermore, the support bars 23 are formed in a blade shape to improve fan performance.

[0039] Using the above Figure 1 The axial fan 1 shown and Figure 2 In the structure of the stator 2 for the axial flow fan shown, the blades 13 are recessed from the root of the hub 12, which is composed of a central support body, to the middle, and then advance from the middle to the outer ring 11. The actual length of the blades is about 1.3 to 1.5 times longer than that of conventional products, thereby ensuring the desired air volume. Moreover, since the two ends of each blade 13 are twisted at the desired angle and integrally integrated with the inner surface of the outer ring 11 and the outer surface of the hub 12, coupled with the effect of reducing the number of blades, the interference of the flow between the front and rear blades can be suppressed, thereby achieving high efficiency.

[0040] More specifically, an axial fan with a dedicated output of 1KW is shown in this invention. Figure 6 ) and the stator for the axial flow fan of the present invention ( Figure 8 ) and the previous 1KW dedicated axial fan ( Figure 5 ) and the stator used in previous axial flow fans ( Figure 7 The shape and size of the ) (Table 1, Table 2) and experimental data (performance comparison) Figures 9-11 ).

[0041] The experimental data shows that, compared with the previous 1KW dedicated axial fan and stator, the air volume of the axial fan and stator of the present invention is increased by +7.2%, the static pressure is increased by +15.0%, the horsepower is reduced by -2.4%, and the static pressure efficiency is increased by +10.8%.

[0042] in addition, Figure 3 The 500W dedicated axial fan shown is 3 and Figure 4 The stator 4 for the axial fan shown is also basically the same as the one described above. Figure 1 , Figure 2 The 1KW dedicated axial fan shown is 1 and Figure 2 The stator 2 shown has a roughly the same structure and achieves roughly the same effect. That is, Figure 3 The 500W dedicated axial fan 3 shown consists of a circular outer ring 31, a hub 32 composed of a circular central support body disposed at the center of the outer ring, and multiple fan blades 33 disposed between the outer ring 31 and the hub 32. Figure 1 Compared to the 1kW output axial fan 1 shown, the number of blades 33 disposed between the outer ring 31 and the hub 32 is less, and the shape and torsion angle of the fan blades 33 are slightly different. Furthermore, the width, length, and tilt angle of the roots at both ends of the fan blades 33 are not particularly limited; they are appropriately set according to the output of the axial fan to suppress abrupt changes in airflow or wind between the fan blades 33 and achieve high efficiency. Similarly, the width, length, and tilt angle of the roots at both ends of the fan blades 33 are not particularly limited as in the 1kW output axial fan 1 described above; they are appropriately set according to the output of the axial fan to suppress abrupt changes in airflow or wind between the fan blades 33 and achieve high efficiency.

[0043] in addition, Figure 4 The stator 4 for the 500W dedicated axial fan shown is also the same as described above. Figure 2The stator 2 shown is substantially the same structure as the 1kW output axial fan stator 2. Specifically, it consists of a circular outer ring 41, a central hub 42, and radially arranged support bars 43 between the outer ring 41 and the hub 42. Its distinguishing feature is that, similar to the 1kW output axial fan stator 2 described above, the blade-shaped support bars 43, arranged radially between the outer ring 41 and the hub 42, are integrally formed with their ends twisted at a desired angle, thus integrating with the inner surface of the outer ring 41 and the outer surface of the hub 42. Furthermore, forming the support bars 43 into a blade shape is, as with the 1kW output axial fan described above, to improve fan performance.

[0044] More specifically, an axial fan with a dedicated output of 500W is shown in this invention. Figure 13 ) and stator for axial flow fans ( Figure 15 ) and the previous 500W dedicated axial fan ( Figure 12 ) and stator for axial flow fans ( Figure 14 The shape and size of the ) (Tables 3 and 4) and experimental data (performance comparison) Figures 16-18 ).

[0045] The experimental data shows that, compared with the previous axial flow fan and stator for axial flow fan with output of 500W, the axial flow fan and stator for axial flow fan of the present invention have a 4.7% increase in horsepower, a 6.5% increase in air volume, a 13.3% increase in static pressure, and a 6.9% increase in static pressure efficiency.

[0046] [Table 1]

[0047]

[0048] [Table 2]

[0049]

[0050] [Table 3]

[0051]

[0052] [Table 4]

[0053]

[0054] [Table 5]

[0055]

[0056] [Table 6]

[0057]

[0058] Explanation of reference numerals in the attached figures

[0059] 1. Dedicated axial fan with 1KW output

[0060] 2. Stator for a dedicated axial fan with a 1kW output.

[0061] 3. Dedicated axial fan with 500W output

[0062] 4. Stator for a dedicated axial fan with a 500W output.

[0063] Outer rings 11, 21, 31, 41

[0064] 12 and 32 wheel hubs

[0065] 13, 33 Fan blades

[0066] 22 and 42 wheel hubs

[0067] 23, 43 support bars

[0068] 24. Reinforcing ring.

Claims

1. An axial flow fan, the axial flow fan being a resin fan comprising, independently provided with a circular outer ring, a hub composed of a circular central support body disposed at the center of the outer ring, and a plurality of blades disposed between the outer ring and the hub, characterized in that, The blade retracts from the root of the central support to the middle and advances from the middle to the outer ring, forming a wide blade of actual length, and the blade is formed into a structure that twists at a desired angle.

2. The axial flow fan according to claim 1, characterized in that, The outer circular ring, the hub consisting of a circular central support, and multiple blades are integrally molded.

3. A fan stator for fixing an axial flow fan, characterized in that, The support bars arranged radially between the central mounting member and the annular outlet bell are formed to match the blade cross-sectional shape of the fan outlet side vector, and each support bar is formed to be twisted at a desired angle in the fan rotation direction.

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