Fan blade structure and fan device

Abstract

A blade structure configured to be mounted to a fan frame is disclosed. The blade structure comprises a hub rotatably disposed on a fan frame, and a plurality of blades, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected to the hub and arranged in an axial direction of the hub. The first blade portion and the second blade portion each include a first side, the first sides of the first blade portion and the second blade portion being directly connected with one another and connected to the hub. A fan device incorporating the blade structure is also disclosed.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This U.S. application claims the benefits of priority to Taiwan application No. 114201451, filed on February 12, 2025, titled “Fan Blade Structure and Fan Device” of which is incorporated herein by reference in its entirety.BACKGROUND

[0002] With the rapid development of technology, the computing performance of processors has increased significantly, resulting in a considerable amount of heat. To ensure that the processor is not damaged by high heat, electronic products are usually equipped with fans to dissipate excess heat from the processor, thereby maintaining the processor to operate within a specific operational temperature range.

[0003] Users typically choose fans based on specifications such as maximum airflow and static pressure. The term “maximum airflow” refers to the airflow rate generated by the fan as it exits the corresponding exhaust outlet when no obstructions exist. This is airflow rate when the exhaust outlet is fully open, enabling all of the fan’s airflow pass through. The term “maximum static pressure” refers to the static pressure generated by the fan’s airflow when the fan’s corresponding exhaust vent is completely blocked by an obstruction. The greater the static pressure, the further the airflow may travel. In general, the higher the maximum air volume and maximum static pressure, the greater the airflow generated by the fan, and the further fan’s airflow can travel, the better the fan’s performance. However, current fan performance is still insufficient to fulfill user expectations. Therefore, improving fan performance is an issue that researchers need to address.SUMMARY

[0004] In general terms, this disclosure is directed to a fan blade structure. In some embodiments, and by non-limiting example, the present disclosure provides a fan device that enhances cooling efficiency within limited spaces of electronic devices.

[0005] Aspects of the present disclosure provide a blade structure configured to be mounted to a fan frame, the blade structure comprising: a hub rotatably disposed on a fan frame; and a plurality of blades, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected to the hub and arranged in an axial direction of the hub; wherein the first blade portion and the second blade portion each include a first side, the first sides of the first blade portion and the second blade portion being directly connected with one another and connected to the hub.

[0006] In some examples, the first blade portion and the second blade portion each include a second side, and the second sides of the first blade portion and the second blade portion are directly connected to one another.

[0007] In some examples, the first blade portion and the second blade portion each further include a third side and a fourth side, the third sides of the first blade portion and the second blade portion define an air inlet, and the fourth sides of the first blade portion and the second blade portion define an air outlet, the air inlet and the air outlet are configured to allow airflow generated by the blade structure to pass therethrough.

[0008] In some examples, a width of the air inlet decreases from a middle portion of the air inlet toward opposite lateral ends thereof, and a width of the air outlet decreases from a middle portion of the air outlet toward opposite lateral ends thereof.

[0009] In some examples, the first blade portion and the second blade portion are arcuate, and a curvature of the first blade portion is greater than a curvature of the second blade portion.

[0010] Aspects of the present disclosure provide a blade structure configured to be mounted to a fan frame, the blade structure comprising: a hub rotatably disposed on a fan frame; and a plurality of blades configured to generate airflow, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected at one side to the hub and defining an airflow space configured to allow passage of the airflow.

[0011] In some examples, the first blade portion includes opposing first outer and first inner surfaces, the second blade portion includes opposing second outer and second inner surfaces, and the first inner surface and the second inner surface face one another within the airflow space.

[0012] In some examples, the first outer surface, the first inner surface, the second outer surface, and the second inner surface are arcuate, and a curvature of each of the first outer surface and the first inner surface is greater than a curvature of each of the second outer surface and the second inner surface.

[0013] In some examples, the first blade portion and the second blade portion each include a first side and a second side opposed to one another, the first sides of the first blade portion and the second blade portion are directly connected to one another and connected to the hub, the second sides of the first blade portion and the second blade portion are directly connected to one another.

[0014] In some examples, the first blade portion and the second blade portion each further include a third side and a fourth side opposed to one another, the third sides of the first blade portion and the second blade portion define an air inlet, and the fourth sides of the first blade portion and the second blade portion define an air outlet, the air inlet and the air outlet are in fluid communication through the airflow space.

[0015] In some examples, a width of the air inlet decreases from a middle portion of the air inlet toward opposite lateral ends thereof, and a width of the air outlet decreases from a middle portion of the air outlet toward opposite lateral ends thereof.

[0016] Aspects of the present disclosure provide a fan device comprising: a fan frame; and a blade structure configured to be mounted to the fan frame, the blade structure including: a hub rotatably disposed on the fan frame; and a plurality of blades, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected to the hub and arranged in an axial direction of the hub; wherein the first blade portion and the second blade portion each include a first side, the first sides of the first blade portion and the second blade portion are directly connected to one another and connected to the hub.

[0017] In some examples, the first blade portion and the second blade portion each include a second side, and the second sides of the first blade portion and the second blade portion are directly connected to one another.

[0018] In some examples, the first blade portion and the second blade portion each further include a third side and a fourth side, the third sides of the first blade portion and the second blade portion define an air inlet, and the fourth sides of the first blade portion and the second blade portion define an air outlet, the air inlet and the air outlet are configured to allow airflow generated by the blade structure to pass therethrough.

[0019] In some examples, a width of the air inlet decreases from a middle portion of the air inlet toward opposite lateral ends thereof, and a width of the air outlet decreases from a middle portion of the air outlet toward opposite lateral ends thereof.

[0020] In some examples, the first blade portion and the second blade portion are arcuate, and a curvature of the first blade portion is greater than a curvature of the second blade portion.

[0021] In some examples, the fan frame has an annular shape.

[0022] In some examples, a maximum diameter of the blade structure is less than a maximum diameter of the fan frame.

[0023] In some examples, the fan frame includes a plurality of spokes.

[0024] In some examples, the blade structure is co-axial with the fan frame.

[0025] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1 is a perspective schematic view of a fan device according to one embodiment of the present disclosure.

[0027] FIG. 2 is a perspective schematic view of a blade structure of the fan in FIG. 1.

[0028] FIG. 3 is another perspective schematic view of a blade structure of the fan in FIG. 1.

[0029] FIG. 4 is a schematic top view of the blade structure of the fan device in FIG. 1.

[0030] FIG. 5 is a schematic cross-sectional view of the blade structure of the fan device of FIG. 4 taken along section line 5-5.

[0031] FIG. 6 is a schematic cross-sectional view of the blade structure of the fan device of FIG. 4 taken along section line 6-6.

[0032] FIG. 7 is a graph illustrating PQ curves at rotational speeds of 2440 RPM.DETAILED DESCRIPTION

[0033] Various embodiments will be described in detail with reference to the drawings, wherein like reference numerals represent like parts and assemblies throughout the several views. Reference to various embodiments does not limit the scope of the claims attached hereto. Additionally, any examples set forth in this specification are not intended to be limiting and merely set forth some of the many possible embodiments for the appended claims.

[0034] Refer to FIGS. 1 to 3. FIG. 1 is a perspective schematic view of a fan device according to one embodiment of the present disclosure. FIG. 2 is a perspective schematic view of a blade structure of the fan in FIG. 1. FIG. 3 is another perspective schematic view of a blade structure of the fan in FIG. 1.

[0035] In one embodiment, the fan device 10 includes the shape of an axial flow fan, with a fan bracket 20 and a blade structure 30. The fan bracket 20 is, for example, in the form of a base. The blade structure 30 includes a hub 31 and a plurality of blades 32, and the hub 31 is rotatably mounted on the fan bracket 20. For each blade 32, it may further include a first blade portion 321 and a second blade portion 322, and one side of both the first blade portion 321 and the second blade portion 322 is connected to the hub 31; so that the hub 31 drives the first blade portion 321 and the second blade portion 322 of the fan blades 32 to generate an airflow.

[0036] In some embodiments, the fan device 10 is provided with a drive unit (not shown), and the drive unit includes a stator (not shown) and a rotor (not shown). The stator and the rotor are, for example, matching magnets or coils. In some embodiments, the stator is secured to the fan bracket 20. In some embodiments, the rotor is rotatably connected to the hub 31 and can rotate relative to the stator through the electromagnetic effect, driving the hub 31 to rotate relative to the fan bracket 20.

[0037] In some embodiments, the fan bracket 20 has the form of a base. In other embodiments, the fan bracket can take the form of a ring frame. In some embodiments, the fan frame 20 is annular in shape. In some embodiments, the fan frame 20 includes an annular outer frame and a plurality of spokes extending radially from the annular outer frame to the hub 31 to support the blade structure 30. In some embodiments, the fan bracket 20 includes an annular outer ring surrounding the blade structure 30.

[0038] Please Refer to FIGS. 4 to 6. FIG. 4 is a schematic top view of the blade structure of the fan device in FIG. 1. FIG. 5 is a schematic cross-sectional view of the blade structure of the fan device of FIG. 4 taken along section line 5-5. FIG. 6 is a schematic cross-sectional view of the blade structure of the fan device of FIG. 4 taken along section line 6-6.

[0039] In some embodiments, the first blade portion 321 and the second blade portion 322 are arranged along the axial direction of the hub 31, i.e., the first blade portion 321 and the second blade portion 322 are double-layered blades. In some embodiments, the first blade portion 321 and the second blade portion 322 together form an airflow space S. The airflow space S is used for airflow circulation. In some embodiments, the first blade portion 321 and the second blade portion 322 feature an arc-shape.

[0040] In some embodiments, the first blade portion 321 has a first outer surface 3211 and a first inner surface 3212 that are positioned opposite one another. In some embodiments, the second blade portion 322 has a second outer surface 3221 and a second inner surface 3222 that are positioned opposite one another. In some embodiments, at least one of the first outer surface 3211, the first inner surface 3212, the second outer surface 3221, and the second inner surface 3222 includes curved surfaces. In some embodiments, the first inner surface 3212 and the second inner surface 3222 face one another, forming the airflow space S. In some embodiments, the curvature of the first outer surface 3211 and the first inner surface 3212 is greater than that of the second outer surface 3221 and the second inner surface 3222. In some embodiments, the curvature of the first blade portion 321 is greater than that of the second blade portion 322.

[0041] In some embodiments, the first blade portion 321 has a first side 3213, a second side 3214, a third side 3215, and a fourth side 3216. In some embodiments, the first side 3213, the second side 3214, the third side 3215, and the fourth side 3216 surround the circumference of the first blade portion 321. In some embodiments, the second blade portion 322 has a first side 3223, a second side 3224, a third side 3225, and a fourth side 3226. In some embodiments, the first side 3223, the second side 3224, the third side 3225, and the fourth side 3226 surround the circumference of the second blade portion 322. In some embodiments, the two first sides 3213 and 3223 are connected to the hub 31. The two first sides 3213 and 3223 are directly connected, and the two second sides 3214 and 3224 are connected.

[0042] In some embodiments, the third sides 3215 and 3225 together surround an air inlet W1, and fourth sides 3216 and 3226 together surround an air outlet W2. In some embodiments, the air inlet W1 and the air outlet W2 are connected through the airflow space S; so that air flows from the air inlet W1 into the airflow space S and then flows out of the airflow space S through the air outlet W2. In some embodiments, the width of the air inlet W1 narrows from the middle to opposing sides of the air inlet W1. In some embodiments, the width of the air outlet W2 narrows from the middle to opposing sides of the air outlet W2. In some embodiments, each blade 32 includes a first blade portion 321 and a second blade portion 322, thus doubling the number of blades in the existing fan devices. In some embodiments, the first blade portion 321 and the second blade portion 322 are aligned along the axis of the hub 31 and together surround an airflow space S.

[0043] These configurations enable the airflow generated by the fan device 10 to pass through the airflow space S and be blown toward the heat source, and allow the maximum airflow of the fan device 10 to be increased from, for example, 73.72 cubic feet per minute to 78.57 cubic feet per minute. The maximum air volume (CFM) of the fan device 10 can be increased by 7%, for example, and the maximum static pressure of the fan device 10 can be increased from 4.06 mmHg (mmAq) to 6.33 mmHg (mmAq), for example, which means that the maximum static pressure of the fan device 10 can be increased by 56%. In this way, the maximum air volume and maximum static pressure of the airflow generated by the fan device 10 can be increased, thereby improving the performance of the fan device 10 and enhancing cooling efficiency within limited spaces of electronic devices, as further illustrated in FIG. 7.

[0044] In some embodiments, the two first sides 3213 and 3223 are connected, and the two second sides 3214 and 3224 are connected. In other embodiments, either the two first sides is connected to one another or the two second sides is connected to one another. In some embodiments, the two first sides 3213 and 3223 are connected to the hub 31 after they are connected to one another; in other embodiments, the two second sides 3214 and 3224 are connected to the annular outer ring of the fan bracket 20 after they are connected to one another.

[0045] Refer to FIG. 5. In this embodiment, when the fan device 10 operates, the fan blade structure 30 generates airflow, which flows from the air inlet W1 along direction A into the airflow space S. The airflow then flows along direction B within the airflow space S. The airflow subsequently exits the airflow space S from the air outlet W2 along direction B, directing the airflow toward the heat source.

[0046] In some embodiments, the blade structure 30 is coaxial with the fan frame 20. In some embodiments, the maximum diameter of the blade structure 30 is less than the maximum diameter of the fan frame 20. This configuration provides clearance between the blade structure 30 and the fan frame 20, thereby reducing wear and operational noise.

[0047] FIG. 7 illustrates a graph with PQ curves (Pressure-Flow curves) comparing the performance characteristics of the double-layered blade versus the single-layered blade at rotational speeds of 2440 RPM. The PQ curves demonstrate the relationship between the airflow delivery capability and the static pressure generated by each system across their respective operating ranges. The graph plots static pressure (P_STP) measured in millimeters of water column (mmAq) on the vertical axis against flow rate (Q_STP) measured in cubic feet per minute (CFM) on the horizontal axis. The vertical axis ranges from 0.0 to 7.0 mmAq, while the horizontal axis ranges from 0.0 to 90.0 CFM.

[0048] Two curves are presented in the graph, with one representing the performance of the double-layered blade and the other representing the conventional single-layered blade design. According to the fan blade structure and fan device of the above-mentioned embodiment, each double-layered blade has a first blade portion and a second blade portion, doubling the number of blades compared to the single-layered blade. Also, the first blade portion and the second blade portion are arranged along the axial direction of the hub and together surround an airflow space, so that the airflow generated by the fan device passes through the airflow space and blows toward the heat source.

[0049] The performance improvements demonstrated in FIG. 7 result directly from the fan device with double-layered blade. For example, the maximum air volume of the fan device can be increased from 73.72 cubic feet per minute to 78.57 cubic feet per minute, which means the maximum air volume of the fan device can be increased by 7%; the maximum static pressure of the fan device can be increased from 4.06 mm of water column to 6.33 mm of water column, which means the maximum static pressure of the fan device can be increased by 56%. This increase the maximum air volume and the maximum static pressure of the airflow generated by the fan device, enhancing its the performance and cooling efficiency within limited spaces of electronic devices.

[0050] The embodiments illustratively disclosed herein suitably may be practiced in the absence of any element that is not specifically disclosed herein and / or any optional element disclosed herein. While compositions and methods are described in terms of “comprising,”“containing,” or “including” various components or steps, the compositions and methods can also “consist essentially of” or “consist of” the various components and steps. All numbers and ranges disclosed above may vary by some number. Whenever a numerical range with a lower limit and an upper limit is disclosed, any number and any included range falling within the range is specifically disclosed. In particular, every range of values (of the form, “from about a to about b,” or, equivalently, “from approximately a to b,” or, equivalently, “from approximately a-b”) disclosed herein is to be understood to set forth every number and range encompassed within the broader range of values. Also, the terms in the claims have their plain, ordinary meaning unless otherwise explicitly and clearly defined by the patentee. Moreover, the indefinite articles “a” or “an,” as used in the claims, are defined herein to mean one or more than one of the elements that it introduces.

Examples

Embodiment Construction

[0033]Various embodiments will be described in detail with reference to the drawings, wherein like reference numerals represent like parts and assemblies throughout the several views. Reference to various embodiments does not limit the scope of the claims attached hereto. Additionally, any examples set forth in this specification are not intended to be limiting and merely set forth some of the many possible embodiments for the appended claims.

[0034]Refer to FIGS. 1 to 3. FIG. 1 is a perspective schematic view of a fan device according to one embodiment of the present disclosure. FIG. 2 is a perspective schematic view of a blade structure of the fan in FIG. 1. FIG. 3 is another perspective schematic view of a blade structure of the fan in FIG. 1.

[0035]In one embodiment, the fan device 10 includes the shape of an axial flow fan, with a fan bracket 20 and a blade structure 30. The fan bracket 20 is, for example, in the form of a base. The blade structure 30 includes a hub 31 and a plur...

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This U.S. application claims the benefits of priority to Taiwan application No. 114201451, filed on February 12, 2025, titled “Fan Blade Structure and Fan Device” of which is incorporated herein by reference in its entirety.BACKGROUND

[0002] With the rapid development of technology, the computing performance of processors has increased significantly, resulting in a considerable amount of heat. To ensure that the processor is not damaged by high heat, electronic products are usually equipped with fans to dissipate excess heat from the processor, thereby maintaining the processor to operate within a specific operational temperature range.

[0003] Users typically choose fans based on specifications such as maximum airflow and static pressure. The term “maximum airflow” refers to the airflow rate generated by the fan as it exits the corresponding exhaust outlet when no obstructions exist. This is airflow rate when the exhaust outlet is fully open, enabling all of the fan’s airflow pass through. The term “maximum static pressure” refers to the static pressure generated by the fan’s airflow when the fan’s corresponding exhaust vent is completely blocked by an obstruction. The greater the static pressure, the further the airflow may travel. In general, the higher the maximum air volume and maximum static pressure, the greater the airflow generated by the fan, and the further fan’s airflow can travel, the better the fan’s performance. However, current fan performance is still insufficient to fulfill user expectations. Therefore, improving fan performance is an issue that researchers need to address.SUMMARY

[0004] In general terms, this disclosure is directed to a fan blade structure. In some embodiments, and by non-limiting example, the present disclosure provides a fan device that enhances cooling efficiency within limited spaces of electronic devices.

[0005] Aspects of the present disclosure provide a blade structure configured to be mounted to a fan frame, the blade structure comprising: a hub rotatably disposed on a fan frame; and a plurality of blades, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected to the hub and arranged in an axial direction of the hub; wherein the first blade portion and the second blade portion each include a first side, the first sides of the first blade portion and the second blade portion being directly connected with one another and connected to the hub.

[0006] In some examples, the first blade portion and the second blade portion each include a second side, and the second sides of the first blade portion and the second blade portion are directly connected to one another.

[0007] In some examples, the first blade portion and the second blade portion each further include a third side and a fourth side, the third sides of the first blade portion and the second blade portion define an air inlet, and the fourth sides of the first blade portion and the second blade portion define an air outlet, the air inlet and the air outlet are configured to allow airflow generated by the blade structure to pass therethrough.

[0008] In some examples, a width of the air inlet decreases from a middle portion of the air inlet toward opposite lateral ends thereof, and a width of the air outlet decreases from a middle portion of the air outlet toward opposite lateral ends thereof.

[0009] In some examples, the first blade portion and the second blade portion are arcuate, and a curvature of the first blade portion is greater than a curvature of the second blade portion.

[0010] Aspects of the present disclosure provide a blade structure configured to be mounted to a fan frame, the blade structure comprising: a hub rotatably disposed on a fan frame; and a plurality of blades configured to generate airflow, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected at one side to the hub and defining an airflow space configured to allow passage of the airflow.

[0011] In some examples, the first blade portion includes opposing first outer and first inner surfaces, the second blade portion includes opposing second outer and second inner surfaces, and the first inner surface and the second inner surface face one another within the airflow space.

[0012] In some examples, the first outer surface, the first inner surface, the second outer surface, and the second inner surface are arcuate, and a curvature of each of the first outer surface and the first inner surface is greater than a curvature of each of the second outer surface and the second inner surface.

[0013] In some examples, the first blade portion and the second blade portion each include a first side and a second side opposed to one another, the first sides of the first blade portion and the second blade portion are directly connected to one another and connected to the hub, the second sides of the first blade portion and the second blade portion are directly connected to one another.

[0014] In some examples, the first blade portion and the second blade portion each further include a third side and a fourth side opposed to one another, the third sides of the first blade portion and the second blade portion define an air inlet, and the fourth sides of the first blade portion and the second blade portion define an air outlet, the air inlet and the air outlet are in fluid communication through the airflow space.

[0015] In some examples, a width of the air inlet decreases from a middle portion of the air inlet toward opposite lateral ends thereof, and a width of the air outlet decreases from a middle portion of the air outlet toward opposite lateral ends thereof.

[0016] Aspects of the present disclosure provide a fan device comprising: a fan frame; and a blade structure configured to be mounted to the fan frame, the blade structure including: a hub rotatably disposed on the fan frame; and a plurality of blades, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected to the hub and arranged in an axial direction of the hub; wherein the first blade portion and the second blade portion each include a first side, the first sides of the first blade portion and the second blade portion are directly connected to one another and connected to the hub.

[0017] In some examples, the first blade portion and the second blade portion each include a second side, and the second sides of the first blade portion and the second blade portion are directly connected to one another.

[0018] In some examples, the first blade portion and the second blade portion each further include a third side and a fourth side, the third sides of the first blade portion and the second blade portion define an air inlet, and the fourth sides of the first blade portion and the second blade portion define an air outlet, the air inlet and the air outlet are configured to allow airflow generated by the blade structure to pass therethrough.

[0019] In some examples, a width of the air inlet decreases from a middle portion of the air inlet toward opposite lateral ends thereof, and a width of the air outlet decreases from a middle portion of the air outlet toward opposite lateral ends thereof.

[0020] In some examples, the first blade portion and the second blade portion are arcuate, and a curvature of the first blade portion is greater than a curvature of the second blade portion.

[0021] In some examples, the fan frame has an annular shape.

[0022] In some examples, a maximum diameter of the blade structure is less than a maximum diameter of the fan frame.

[0023] In some examples, the fan frame includes a plurality of spokes.

[0024] In some examples, the blade structure is co-axial with the fan frame.

[0025] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG. 1 is a perspective schematic view of a fan device according to one embodiment of the present disclosure.

[0027] FIG. 2 is a perspective schematic view of a blade structure of the fan in FIG. 1.

[0028] FIG. 3 is another perspective schematic view of a blade structure of the fan in FIG. 1.

[0029] FIG. 4 is a schematic top view of the blade structure of the fan device in FIG. 1.

[0030] FIG. 5 is a schematic cross-sectional view of the blade structure of the fan device of FIG. 4 taken along section line 5-5.

[0031] FIG. 6 is a schematic cross-sectional view of the blade structure of the fan device of FIG. 4 taken along section line 6-6.

[0032] FIG. 7 is a graph illustrating PQ curves at rotational speeds of 2440 RPM.DETAILED DESCRIPTION

[0033] Various embodiments will be described in detail with reference to the drawings, wherein like reference numerals represent like parts and assemblies throughout the several views. Reference to various embodiments does not limit the scope of the claims attached hereto. Additionally, any examples set forth in this specification are not intended to be limiting and merely set forth some of the many possible embodiments for the appended claims.

[0034] Refer to FIGS. 1 to 3. FIG. 1 is a perspective schematic view of a fan device according to one embodiment of the present disclosure. FIG. 2 is a perspective schematic view of a blade structure of the fan in FIG. 1. FIG. 3 is another perspective schematic view of a blade structure of the fan in FIG. 1.

[0035] In one embodiment, the fan device 10 includes the shape of an axial flow fan, with a fan bracket 20 and a blade structure 30. The fan bracket 20 is, for example, in the form of a base. The blade structure 30 includes a hub 31 and a plurality of blades 32, and the hub 31 is rotatably mounted on the fan bracket 20. For each blade 32, it may further include a first blade portion 321 and a second blade portion 322, and one side of both the first blade portion 321 and the second blade portion 322 is connected to the hub 31; so that the hub 31 drives the first blade portion 321 and the second blade portion 322 of the fan blades 32 to generate an airflow.

[0036] In some embodiments, the fan device 10 is provided with a drive unit (not shown), and the drive unit includes a stator (not shown) and a rotor (not shown). The stator and the rotor are, for example, matching magnets or coils. In some embodiments, the stator is secured to the fan bracket 20. In some embodiments, the rotor is rotatably connected to the hub 31 and can rotate relative to the stator through the electromagnetic effect, driving the hub 31 to rotate relative to the fan bracket 20.

[0037] In some embodiments, the fan bracket 20 has the form of a base. In other embodiments, the fan bracket can take the form of a ring frame. In some embodiments, the fan frame 20 is annular in shape. In some embodiments, the fan frame 20 includes an annular outer frame and a plurality of spokes extending radially from the annular outer frame to the hub 31 to support the blade structure 30. In some embodiments, the fan bracket 20 includes an annular outer ring surrounding the blade structure 30.

[0038] Please Refer to FIGS. 4 to 6. FIG. 4 is a schematic top view of the blade structure of the fan device in FIG. 1. FIG. 5 is a schematic cross-sectional view of the blade structure of the fan device of FIG. 4 taken along section line 5-5. FIG. 6 is a schematic cross-sectional view of the blade structure of the fan device of FIG. 4 taken along section line 6-6.

[0039] In some embodiments, the first blade portion 321 and the second blade portion 322 are arranged along the axial direction of the hub 31, i.e., the first blade portion 321 and the second blade portion 322 are double-layered blades. In some embodiments, the first blade portion 321 and the second blade portion 322 together form an airflow space S. The airflow space S is used for airflow circulation. In some embodiments, the first blade portion 321 and the second blade portion 322 feature an arc-shape.

[0040] In some embodiments, the first blade portion 321 has a first outer surface 3211 and a first inner surface 3212 that are positioned opposite one another. In some embodiments, the second blade portion 322 has a second outer surface 3221 and a second inner surface 3222 that are positioned opposite one another. In some embodiments, at least one of the first outer surface 3211, the first inner surface 3212, the second outer surface 3221, and the second inner surface 3222 includes curved surfaces. In some embodiments, the first inner surface 3212 and the second inner surface 3222 face one another, forming the airflow space S. In some embodiments, the curvature of the first outer surface 3211 and the first inner surface 3212 is greater than that of the second outer surface 3221 and the second inner surface 3222. In some embodiments, the curvature of the first blade portion 321 is greater than that of the second blade portion 322.

[0041] In some embodiments, the first blade portion 321 has a first side 3213, a second side 3214, a third side 3215, and a fourth side 3216. In some embodiments, the first side 3213, the second side 3214, the third side 3215, and the fourth side 3216 surround the circumference of the first blade portion 321. In some embodiments, the second blade portion 322 has a first side 3223, a second side 3224, a third side 3225, and a fourth side 3226. In some embodiments, the first side 3223, the second side 3224, the third side 3225, and the fourth side 3226 surround the circumference of the second blade portion 322. In some embodiments, the two first sides 3213 and 3223 are connected to the hub 31. The two first sides 3213 and 3223 are directly connected, and the two second sides 3214 and 3224 are connected.

[0042] In some embodiments, the third sides 3215 and 3225 together surround an air inlet W1, and fourth sides 3216 and 3226 together surround an air outlet W2. In some embodiments, the air inlet W1 and the air outlet W2 are connected through the airflow space S; so that air flows from the air inlet W1 into the airflow space S and then flows out of the airflow space S through the air outlet W2. In some embodiments, the width of the air inlet W1 narrows from the middle to opposing sides of the air inlet W1. In some embodiments, the width of the air outlet W2 narrows from the middle to opposing sides of the air outlet W2. In some embodiments, each blade 32 includes a first blade portion 321 and a second blade portion 322, thus doubling the number of blades in the existing fan devices. In some embodiments, the first blade portion 321 and the second blade portion 322 are aligned along the axis of the hub 31 and together surround an airflow space S.

[0043] These configurations enable the airflow generated by the fan device 10 to pass through the airflow space S and be blown toward the heat source, and allow the maximum airflow of the fan device 10 to be increased from, for example, 73.72 cubic feet per minute to 78.57 cubic feet per minute. The maximum air volume (CFM) of the fan device 10 can be increased by 7%, for example, and the maximum static pressure of the fan device 10 can be increased from 4.06 mmHg (mmAq) to 6.33 mmHg (mmAq), for example, which means that the maximum static pressure of the fan device 10 can be increased by 56%. In this way, the maximum air volume and maximum static pressure of the airflow generated by the fan device 10 can be increased, thereby improving the performance of the fan device 10 and enhancing cooling efficiency within limited spaces of electronic devices, as further illustrated in FIG. 7.

[0044] In some embodiments, the two first sides 3213 and 3223 are connected, and the two second sides 3214 and 3224 are connected. In other embodiments, either the two first sides is connected to one another or the two second sides is connected to one another. In some embodiments, the two first sides 3213 and 3223 are connected to the hub 31 after they are connected to one another; in other embodiments, the two second sides 3214 and 3224 are connected to the annular outer ring of the fan bracket 20 after they are connected to one another.

[0045] Refer to FIG. 5. In this embodiment, when the fan device 10 operates, the fan blade structure 30 generates airflow, which flows from the air inlet W1 along direction A into the airflow space S. The airflow then flows along direction B within the airflow space S. The airflow subsequently exits the airflow space S from the air outlet W2 along direction B, directing the airflow toward the heat source.

[0046] In some embodiments, the blade structure 30 is coaxial with the fan frame 20. In some embodiments, the maximum diameter of the blade structure 30 is less than the maximum diameter of the fan frame 20. This configuration provides clearance between the blade structure 30 and the fan frame 20, thereby reducing wear and operational noise.

[0047] FIG. 7 illustrates a graph with PQ curves (Pressure-Flow curves) comparing the performance characteristics of the double-layered blade versus the single-layered blade at rotational speeds of 2440 RPM. The PQ curves demonstrate the relationship between the airflow delivery capability and the static pressure generated by each system across their respective operating ranges. The graph plots static pressure (P_STP) measured in millimeters of water column (mmAq) on the vertical axis against flow rate (Q_STP) measured in cubic feet per minute (CFM) on the horizontal axis. The vertical axis ranges from 0.0 to 7.0 mmAq, while the horizontal axis ranges from 0.0 to 90.0 CFM.

[0048] Two curves are presented in the graph, with one representing the performance of the double-layered blade and the other representing the conventional single-layered blade design. According to the fan blade structure and fan device of the above-mentioned embodiment, each double-layered blade has a first blade portion and a second blade portion, doubling the number of blades compared to the single-layered blade. Also, the first blade portion and the second blade portion are arranged along the axial direction of the hub and together surround an airflow space, so that the airflow generated by the fan device passes through the airflow space and blows toward the heat source.

[0049] The performance improvements demonstrated in FIG. 7 result directly from the fan device with double-layered blade. For example, the maximum air volume of the fan device can be increased from 73.72 cubic feet per minute to 78.57 cubic feet per minute, which means the maximum air volume of the fan device can be increased by 7%; the maximum static pressure of the fan device can be increased from 4.06 mm of water column to 6.33 mm of water column, which means the maximum static pressure of the fan device can be increased by 56%. This increase the maximum air volume and the maximum static pressure of the airflow generated by the fan device, enhancing its the performance and cooling efficiency within limited spaces of electronic devices.

[0050] The embodiments illustratively disclosed herein suitably may be practiced in the absence of any element that is not specifically disclosed herein and / or any optional element disclosed herein. While compositions and methods are described in terms of “comprising,”“containing,” or “including” various components or steps, the compositions and methods can also “consist essentially of” or “consist of” the various components and steps. All numbers and ranges disclosed above may vary by some number. Whenever a numerical range with a lower limit and an upper limit is disclosed, any number and any included range falling within the range is specifically disclosed. In particular, every range of values (of the form, “from about a to about b,” or, equivalently, “from approximately a to b,” or, equivalently, “from approximately a-b”) disclosed herein is to be understood to set forth every number and range encompassed within the broader range of values. Also, the terms in the claims have their plain, ordinary meaning unless otherwise explicitly and clearly defined by the patentee. Moreover, the indefinite articles “a” or “an,” as used in the claims, are defined herein to mean one or more than one of the elements that it introduces.

Examples

Embodiment Construction

[0033]Various embodiments will be described in detail with reference to the drawings, wherein like reference numerals represent like parts and assemblies throughout the several views. Reference to various embodiments does not limit the scope of the claims attached hereto. Additionally, any examples set forth in this specification are not intended to be limiting and merely set forth some of the many possible embodiments for the appended claims.

[0034]Refer to FIGS. 1 to 3. FIG. 1 is a perspective schematic view of a fan device according to one embodiment of the present disclosure. FIG. 2 is a perspective schematic view of a blade structure of the fan in FIG. 1. FIG. 3 is another perspective schematic view of a blade structure of the fan in FIG. 1.

[0035]In one embodiment, the fan device 10 includes the shape of an axial flow fan, with a fan bracket 20 and a blade structure 30. The fan bracket 20 is, for example, in the form of a base. The blade structure 30 includes a hub 31 and a plur...

Claims

1. A blade structure configured to be mounted to a fan frame, the blade structure comprising:a hub rotatably disposed on a fan frame; anda plurality of blades, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected to the hub and arranged in an axial direction of the hub;wherein the first blade portion and the second blade portion each include a first side, the first sides of the first blade portion and the second blade portion being directly connected with one another and connected to the hub.

2. The blade structure of claim 1, wherein the first blade portion and the second blade portion each include a second side, and the second sides of the first blade portion and the second blade portion are directly connected to one another.

3. The blade structure of claim 1, wherein the first blade portion and the second blade portion each further include a third side and a fourth side, the third sides of the first blade portion and the second blade portion define an air inlet, and the fourth sides of the first blade portion and the second blade portion define an air outlet, the air inlet and the air outlet are configured to allow airflow generated by the blade structure to pass therethrough.

4. The blade structure of claim 3, wherein a width of the air inlet decreases from a middle portion of the air inlet toward opposite lateral ends thereof, and a width of the air outlet decreases from a middle portion of the air outlet toward opposite lateral ends thereof.

5. The blade structure of claim 1, wherein the first blade portion and the second blade portion are arcuate, and a curvature of the first blade portion is greater than a curvature of the second blade portion.

6. A blade structure configured to be mounted to a fan frame, the blade structure comprising:a hub rotatably disposed on a fan frame; anda plurality of blades configured to generate airflow, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected at one side to the hub and defining an airflow space configured to allow passage of the airflow.

7. The blade structure of claim 6, wherein the first blade portion includes opposing first outer and first inner surfaces, the second blade portion includes opposing second outer and second inner surfaces, and the first inner surface and the second inner surface face one another within the airflow space.

8. The blade structure of claim 7, wherein the first outer surface, the first inner surface, the second outer surface, and the second inner surface are arcuate, and a curvature of each of the first outer surface and the first inner surface is greater than a curvature of each of the second outer surface and the second inner surface.

9. The blade structure of claim 6, wherein the first blade portion and the second blade portion each include a first side and a second side opposed to one another, the first sides of the first blade portion and the second blade portion are directly connected to one another and connected to the hub, the second sides of the first blade portion and the second blade portion are directly connected to one another.

10. The blade structure of claim 9, wherein the first blade portion and the second blade portion each further include a third side and a fourth side opposed to one another, the third sides of the first blade portion and the second blade portion define an air inlet, and the fourth sides of the first blade portion and the second blade portion define an air outlet, the air inlet and the air outlet are in fluid communication through the airflow space.

11. The blade structure of claim 10, wherein a width of the air inlet decreases from a middle portion of the air inlet toward opposite lateral ends thereof, and a width of the air outlet decreases from a middle portion of the air outlet toward opposite lateral ends thereof.

12. A fan device comprising:a fan frame; anda blade structure configured to be mounted to the fan frame, the blade structure including:a hub rotatably disposed on the fan frame; anda plurality of blades, each blade comprising a first blade portion and a second blade portion, the first blade portion and the second blade portion being connected to the hub and arranged in an axial direction of the hub;wherein the first blade portion and the second blade portion each include a first side, the first sides of the first blade portion and the second blade portion are directly connected to one another and connected to the hub.

13. The fan device of claim 12, wherein the first blade portion and the second blade portion each include a second side, and the second sides of the first blade portion and the second blade portion are directly connected to one another.

14. The fan device of claim 12, wherein the first blade portion and the second blade portion each further include a third side and a fourth side, the third sides of the first blade portion and the second blade portion define an air inlet, and the fourth sides of the first blade portion and the second blade portion define an air outlet, the air inlet and the air outlet are configured to allow airflow generated by the blade structure to pass therethrough.

15. The fan device of claim 14, wherein a width of the air inlet decreases from a middle portion of the air inlet toward opposite lateral ends thereof, and a width of the air outlet decreases from a middle portion of the air outlet toward opposite lateral ends thereof.

16. The fan device of claim 12, wherein the first blade portion and the second blade portion are arcuate, and a curvature of the first blade portion is greater than a curvature of the second blade portion.

17. The fan device of claim 12, wherein the fan frame has an annular shape.

18. The fan device of claim 12, wherein a maximum diameter of the blade structure is less than a maximum diameter of the fan frame.

19. The fan device of claim 12, wherein the fan frame includes a plurality of spokes.

20. The fan device of claim 12, wherein the blade structure is co-axial with the fan frame.

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