Fan module

Abstract

The present disclosure provides a fan module, which comprises a frame and an impeller. The frame comprises an outer frame, a base and a plurality of ribs, wherein the base is arranged in the outer frame by the ribs. The impeller is connected to the frame and comprises a wheel valley and a plurality of fan blades. The wheel valley is pivotally connected to the base of the frame by a rotating shaft. The plurality of fan blades are arranged on the wheel valley, wherein each of the fan blades has a leading edge and a trailing edge extending from the base towards the outer frame. The trailing edge of each of the fan blades has a plurality of wave structures, and the waveforms or amplitudes of adjacent two of the wave structures are different. The fan module provided by the present disclosure can effectively reduce the vortex generated during the operation of the fan module and suppress vibration or noise.

Description

Technical Field

[0001] This disclosure relates to fan modules, and more particularly to a fan module having multiple wave structures formed on the trailing edge of the fan blades. Background Technology

[0002] As the power of electronic devices increases, the heat generated during operation also rises significantly. To effectively dissipate heat, fan modules can be installed on these devices, driving fluid convection. However, eddies may form between the fan module and the fluid, potentially causing unintended vibrations and noise, and reducing the fan module's operating efficiency. Therefore, while existing fan modules have largely met their intended uses, they are not perfect in every aspect. Effectively reducing eddies generated by fan modules during operation and suppressing vibrations or noise has become a pressing issue. Utility Model Content

[0003] According to some embodiments, a fan module is provided, comprising a frame and an impeller. The frame includes an outer frame, a base, and a plurality of ribs, wherein the base is disposed within the outer frame via the ribs. The impeller is connected to the frame and includes a trough and a plurality of fan blades. The trough is pivotally connected to the base of the frame via a pivot. The plurality of fan blades are disposed on the trough, wherein each fan blade has a leading edge and a trailing edge extending from the base toward the outer frame. The trailing edge of each fan blade has a plurality of wave structures, and adjacent wave structures have different waveforms or amplitudes.

[0004] In embodiments of this invention, the plurality of wave structures have a sine curve or a quasi-sine curve.

[0005] In an embodiment of this invention, the wavelengths of the plurality of wave structures gradually decrease from the side adjacent to the trough toward the outer frame.

[0006] In an embodiment of this invention, the wavelengths of the plurality of wave structures gradually increase from the side adjacent to the trough toward the outer frame.

[0007] In an embodiment of the present invention, each of the plurality of fan blades further has an inner edge and an outer edge opposite to each other, the inner edge and the outer edge being located between the leading edge and the trailing edge, and the inner edge being connected to the trough, wherein the one of the plurality of wave structures closest to the inner edge is directly connected to the inner edge.

[0008] In an embodiment of the present invention, each of the plurality of fan blades further has an inner edge and an outer edge opposite to each other, the inner edge and the outer edge being located between the leading edge and the trailing edge, and the inner edge being connected to the trough, wherein the one of the plurality of wave structures closest to the inner edge is spaced apart from the inner edge.

[0009] In an embodiment of this invention, the distance accounts for 1 / 2 to 2 / 3 of the total length of the trailing edge.

[0010] In an embodiment of the present invention, each of the plurality of fan blades further has an inner edge and an outer edge opposite to each other, the inner edge and the outer edge being located between the leading edge and the trailing edge, and the inner edge being connected to the trough, wherein the side of the leading edge adjacent to the outer edge is raised to a first height in a direction away from the base.

[0011] In an embodiment of this utility model, the side of the rear edge adjacent to the outer edge is raised to a second height in the direction of the base.

[0012] In an embodiment of this invention, the second height is smaller than the first height.

[0013] The fan module disclosed herein can be applied to various electronic devices or power machinery. To make the features and advantages of this disclosure more apparent and understandable, various embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0014] The viewpoints of the disclosed embodiments will be better understood through the following detailed description in conjunction with the accompanying drawings. It is worth noting that, according to industry standard practice, some features may not be drawn to scale. In fact, the dimensions of different features may be increased or decreased for clarity of description.

[0015] Figure 1 This is a top view schematic diagram of a fan module according to some embodiments of the present disclosure;

[0016] Figure 2 This is a bottom view schematic diagram of the frame according to some embodiments disclosed herein;

[0017] Figure 3 This is an enlarged schematic diagram of the fan blades according to some embodiments of the present disclosure;

[0018] Figure 4 This is a top view schematic diagram of the fan blades according to some embodiments disclosed herein.

[0019] Explanation of icon numbers

[0020] 1: Fan Module

[0021] 10: Frame

[0022] 100: Outer frame

[0023] 101: Base

[0024] 102: Ribs

[0025] 11: Impeller

[0026] 110:Rungu

[0027] 111: Fan blade

[0028] 111A: Leading edge

[0029] 111B: Trailing edge

[0030] 111C: Outer edge

[0031] 111D: Inner edge

[0032] AS: Compartmental Space

[0033] D: Distance

[0034] H1: First Height

[0035] H2: Second Altitude

[0036] P1: First peak

[0037] P2: Second peak

[0038] P3: Third Peak

[0039] P4: Fourth Peak

[0040] V1: The First Wave

[0041] V2: The Second Wave

[0042] V3: The Third Wave

[0043] WS: Wave Structure

[0044] WS1: First wave structure

[0045] WS2: Second wave structure

[0046] WS3: Third Wave Structure Detailed Implementation

[0047] The following disclosure provides many different embodiments or examples for implementing the provided apparatus. Specific examples of the components and their configurations are described below to simplify the embodiments disclosed herein, and are not intended to limit the scope of the disclosure. For example, if the description refers to a first component forming on a second component, it may include embodiments where the first and second components are in direct contact, or embodiments where an additional component is formed between the first and second components, so that the first and second components are not in direct contact. Furthermore, element symbols and / or characters may be repeated in different embodiments or examples in this disclosure. Such repetition is for brevity and clarity, and is not intended to indicate a relationship between the different embodiments and / or examples discussed.

[0048] In some embodiments disclosed herein, terms such as “setup”, “connection”, and similar terms, unless specifically defined, may refer to two components in direct contact, or to two components not in direct contact, wherein an additional connecting component is located between the two structures. Terms such as “setup” and “connection” may also include cases where both structures are movable or both structures are fixed.

[0049] In addition, the terms "first," "second," and similar terms mentioned in this specification or the claims are used to name different components or to distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of components, nor to limit the manufacturing order or the order in which the components are installed.

[0050] In this text, the terms "approximately," "about," and "substantially" generally indicate that a given value or range is within 10%, 5%, 3%, 2%, 1%, or 0.5%. The given quantities are approximate, meaning that the terms "approximately," "about," or "substantially" are implied even without specific mention. The phrase "the range is between the first and second values" indicates that the range includes the first value, the second value, and other values ​​in between. Furthermore, any two values ​​or directions used for comparison may have a certain degree of error. If the first value equals the second value, it implies an error of approximately 10%, 5%, 3%, 2%, 1%, or 0.5% between them. If the first direction is perpendicular to the second direction, the angle between the first and second directions may be between 80 and 100 degrees. If the first direction is parallel to the second direction, then the angle between the first direction and the second direction can be between 0 degrees and 10 degrees.

[0051] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It is understood that such terms, for example, as defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the relevant art and the background or context of this disclosure, and should not be interpreted in an idealized or overly formal manner, unless specifically defined in the embodiments of this disclosure.

[0052] It should be understood that, for clarity, some components of the apparatus are omitted in the accompanying drawings, and only some components are schematically shown. In some embodiments, additional components may be added to the apparatus described below. In other embodiments, some components of the apparatus described below may be replaced or omitted. It should be understood that, in some embodiments, additional operating steps may be provided before, during, and / or after the method of manufacturing the apparatus. In some embodiments, some operating steps may be replaced or omitted, and the order of some operating steps is interchangeable.

[0053] In fan modules, airflow is typically driven by rotating fan blades. More specifically, the fan blades usually have a specific tilt angle (or pitch angle). When the fan blades rotate, a pressure difference is generated on both sides of the blades due to the tilt angle. This pressure difference causes the surrounding air to move axially or radially, thus creating a noticeable airflow. However, in some cases (e.g., when the pressure difference is too large), unintended strong vortices may be generated at the trailing edge of the fan blades. These unintended vortices can cause friction with the fan module or other devices, resulting in significant vibration or noise. Furthermore, unintended vortices can also lead to a decrease in the operating efficiency of the fan module. Therefore, this disclosure provides a fan module that effectively generates smooth airflow by incorporating multiple wave structures at the trailing edge of the fan blades, thereby improving vibration, noise, and operating efficiency.

[0054] Reference Figures 1 to 4The figures shown are, respectively, top view of the fan module, bottom view of the frame, enlarged view of the fan blades, and top view of the fan blades, according to some embodiments of this disclosure. It is worth noting that although these figures illustrate the general structure of the fan module 1, they are used to make this disclosure clearer and more understandable, and are not intended to limit this disclosure. In other words, the shape, size, and quantity of the fan module 1 and its components are for reference only. For example, the fan module 1 can be applied to: power machinery, such as a water tank cooling fan in a car engine compartment, a cooling fan for an electric motor; household electronic products, such as a cooling fan for a computer, a cooling fan for an air purifier; automotive electronic products, such as a cooling fan for a head-up display, a cooling fan for a navigation system; and other devices requiring heat dissipation. When the fan module 1 is applied to the above-mentioned devices, the shape, size, and quantity of the various components of the fan module 1 can be adjusted according to requirements, and are not limited to those shown in the figures of this disclosure.

[0055] like Figure 1 and Figure 2 As shown, the fan module 1 includes a frame 10 and an impeller 11, with the impeller 11 mounted on the frame 10. The frame 10 may include an outer frame 100, a base 101, and a plurality of ribs 102, wherein the base 101 and the ribs 102 are disposed within the outer frame 100. Specifically, the outer frame 100 is used to accommodate the impeller 11, and the outer frame 100 surrounds the base 101 and the ribs 102. Viewed from above, the inner sidewall of the outer frame 100 forms an accommodating space AS, which is a circular space for accommodating the base 101, the ribs 102, and the impeller 11.

[0056] In some embodiments, the accommodating space AS has a size corresponding to that of the impeller 11. For example, the diameter of the accommodating space AS may be slightly larger than the diameter of the impeller 11, for example, greater than 1% to 5%. When the diameter of the accommodating space AS is too small, the outer edge of the impeller 11 may come too close to the inner wall of the outer frame 100, or even rub against the inner wall of the outer frame 100, which could damage the device. Conversely, when the diameter of the accommodating space AS is too large, the distance between the outer edge of the impeller 11 and the inner wall of the outer frame 100 may be too large, which could cause gas to pass between them without being entrained in the airflow, resulting in reduced operating efficiency. In this embodiment, the outer frame 100 is circular in shape when viewed from above. However, this disclosure is not limited to this. In other embodiments, the shape of the outer frame 100 may also be rectangular, polygonal, arc-shaped, a combination thereof, or other similar shapes, depending on the actual application scenario.

[0057] The base 101 is disposed within the outer frame 100 via ribs 102. Specifically, the base 101 is used to connect the impeller 11. In some embodiments, the base 101 may include a shaft or similar element to allow the impeller 11 to be fitted onto and rotated. In this embodiment, the base 101 is circular in shape. However, this disclosure is not limited thereto. In other embodiments, the base 101 may also be circular, polygonal, arc-shaped, a combination thereof, or other similar shapes, depending on the actual application scenario.

[0058] Ribs 102 are disposed between the outer frame 100 and the base 101. Specifically, ribs 102 are used to fix the base 101 so that the base 101 can be located at the center of the outer frame 100. In some embodiments, the number of ribs 102 can be a positive integer greater than 2. For example, the number of ribs 102 can be 2, 3, 4, 5, 6, 7, 8, 9, 10 or more, but this disclosure is not limited thereto. In some embodiments, the spacing (or angle) between two adjacent ribs 102 can be a fixed value. In other words, the ribs 102 are disposed between the outer frame 100 and the base 101 at a fixed spacing. However, this disclosure is not limited thereto. In some embodiments, the spacing (or angle) between two adjacent ribs 102 can also be a variable value. In other words, the ribs 102 are disposed between the outer frame 100 and the base 101 at a non-fixed spacing.

[0059] In some embodiments, the materials of the outer frame 100, base 101, and ribs 102 in the frame 10 may be similar or the same, but this disclosure is not limited thereto. For example, the same polymer material may be used to form the outer frame 100, base 101, and ribs 102 in the frame 10. For example, the various components in the frame 10 may be integrally formed. Alternatively, different materials may be used to form the outer frame 100, base 101, and ribs 102. For example, to improve the overall mechanical strength of the frame 10 and maintain the lightweight of the device, metal may be used to form the ribs 102, and a polymer material may be used to form the outer frame 100 and base 101.

[0060] like Figure 1 and Figure 3 As shown, the impeller 11 is connected to the frame 10 and includes a trough 110 and a plurality of blades 111. The trough 110 is pivotally connected to the base 101 of the frame 10. For example, the trough 110 can be pivotally connected to the base 101 of the frame 10 via a pivot (not shown), but this disclosure is not limited thereto. In other embodiments, other structures can be used to fix the trough 110 to replace the pivot. In some embodiments, the trough 110 and the pivot (or base 101) can be detachably connected or fixedly connected.

[0061] Multiple fan blades 111 are disposed on the troughs 110 to drive gas flow through the pressure difference generated during rotation. In some embodiments, the number of fan blades 111 can be a positive integer greater than 2. For example, the number of fan blades 111 can be 2, 3, 4, 5, 6, 7, 8, 9, 10 or more, but this disclosure is not limited thereto. In some embodiments, the spacing (or angle) between two adjacent fan blades 111 can be a fixed value. In other words, the fan blades 111 are disposed on the troughs 110 at a fixed spacing. However, this disclosure is not limited thereto. In some embodiments, the spacing (or angle) between two adjacent fan blades 111 can also be a variable value. In other words, the fan blades 111 are disposed on the troughs 110 at a non-fixed spacing (or angle).

[0062] Specifically, each of the fan blades 111 has a leading edge 111A and a trailing edge 111B extending from the trough 110 toward the outer frame 100, and an inner edge 111D and an outer edge 111C located between the leading edge 111A and the trailing edge 111B and opposite to each other, wherein the inner edge 111D is connected to the trough 110. During the rotation of the fan blades 111, the side of the fan blades 111 facing the air inlet of the fan frame is the pressure surface, while the side of the fan blades 111 facing the air outlet of the fan frame is the suction surface (or working surface). In other words, the leading edge 111A of the fan blades 111 impacts gas molecules head-on, causing these molecules to flow along the pressure surface and the suction surface respectively, ultimately forming a wake with a specific direction at the junction of the outer edge 111C and the trailing edge 111B.

[0063] In practical applications, as the rotational speed of fan module 1 increases, excessive pressure difference can cause the smooth wake to transform into vortices. These vortices can then interact unintended with fan module 1 or other devices (e.g., causing vibration or noise). To address the vortex problem, this disclosure provides multiple wave structures WS at the trailing edge 111B of the fan blade 111. These wave structures WS are used to improve the gas streamlines of the wake, thereby reducing or completely eliminating the generation of vortices.

[0064] For ease of understanding, the following text will use... Figure 4The diagram is provided for illustration. As shown, the wave structure WS includes a first wave structure WS1, a second wave structure WS2, and a third wave structure WS3. The complete waveform period of each wave structure WS can be defined as the distance from one peak to the next adjacent peak (or, as the distance from one trough to the next adjacent trough). In other words, the first wave structure WS1 is defined as a concave-convex structure from the first peak P1 through the first trough V1 to the second peak P2; the second wave structure WS2 is defined as a concave-convex structure from the second peak P2 through the second trough V2 to the third peak P3; and the third wave structure WS3 is defined as a concave-convex structure from the third peak P3 through the third trough V3 to the fourth peak P4.

[0065] In some embodiments, the wave structure WS may have a sine wave or a quasi-sine wave shape. Taking a sine wave as an example, the top view profile of the wave structure WS can be roughly represented by the following formula: Where A is the amplitude of the wave structure WS, and the amplitude is half the vertical distance from the trough to the crest (e.g., half the vertical height from the first crest P1 to the first trough V1). λ is the wavelength of the wave structure WS, and the wavelength is the shortest horizontal distance between the two crests (e.g., the horizontal length from the first crest P1 to the second trough V2). Taking a quasi-sine curve as an example, although its top-view profile resembles a sine curve, it may have features such as left-right asymmetry. For example, in the horizontal direction, the trough of a quasi-sine curve may not be located at the exact center of the two crests, but rather a crest biased to one side (e.g., the right side). Alternatively, the crest of a quasi-sine curve may also have a peak shape that is flatter on one side than the other. In other words, this disclosure does not particularly limit the specific shape of the wave structure WS, but essentially achieves the effect of improving gas streamlines by adjusting the relative relationship between adjacent wave structures WS.

[0066] like Figure 3 and Figure 4As shown, the first wave structure WS1 has a sinusoidal curve, wherein the first trough V1 of the first wave structure WS1 is not located horizontally at the center between the first peak P1 and the second peak P2, but rather on the side biased towards the second peak P2 (i.e., the left side). The second wave structure WS2 has a sinusoidal curve, wherein the second trough V2 of the second wave structure WS2 is not located horizontally at the center between the second peak P2 and the third peak P3, but rather on the side biased towards the second peak P2 (e.g., the right side). The third wave structure WS3 has a sinusoidal curve, wherein the third trough V3 of the third wave structure WS3 is approximately located horizontally at the center between the third peak P3 and the fourth peak P4. In other words, adjacent pairs of the first wave structure WS1, the second wave structure WS2, and the third wave structure WS3 have different waveforms.

[0067] As described above, in this disclosure, the waveforms and amplitudes of adjacent wave structures WS are different, or both are different. This effectively improves the gas streamlines of the wake (e.g., reduces pressure differential), making the wake smoother and thus reducing eddy generation. Therefore, variations in the wave structure WS can include the following combinations: For example, with different waveforms, one of the adjacent wave structures WS may have a sinusoidal shape, while the other may have a quasi-sinusoidal shape. Alternatively, both adjacent wave structures WS may have quasi-sinusoidal shapes, but their top-view profiles are at least partially different (i.e., they cannot completely overlap). For example, with different amplitudes, one of the adjacent wave structures WS has a larger amplitude than the other. For example, with both different waveforms and amplitudes, one of the adjacent wave structures WS may have a sinusoidal shape and a larger amplitude, while the other may have a quasi-sinusoidal shape and a smaller amplitude. Alternatively, in two adjacent wave structures (WS), both have a sinusoidal shape, but their top-view profiles are at least partially different (i.e., they cannot completely overlap), and their amplitudes are different.

[0068] In some embodiments, in addition to directly adjusting the wavelength, amplitude, or main waveform of the wave structure WS, the effects described above can also be achieved by altering the detailed features of the top-view profile of the wave structure WS. For example, the opening shape of one of the wave structures WS (i.e., the opening formed by two wave crests) can be made larger, while the opening shape of the adjacent wave structure WS can be made smaller. Alternatively, the local curvature or waveform smoothness of the crests or troughs of one of the wave structures WS can be made larger, while the local curvature or waveform smoothness of the adjacent wave structure WS can be made smaller.

[0069] In some embodiments, each of the wave structures WS may have the same wavelength but different amplitudes. Alternatively, each of the wave structures WS may have the same amplitude but different wavelengths. In this case, the multiple wave structures WS may be arranged sequentially according to wavelength (or amplitude). For example, the wavelength (or amplitude) of the wave structures WS may gradually decrease or gradually increase from the side adjacent to the trough 110 (or inner edge 111D) toward the outer frame 100 (or outer edge 111C). Alternatively, each of the wave structures WS may have different wavelengths and amplitudes. In this case, the multiple wave structures WS may be arranged sequentially according to either wavelength or amplitude. Of course, this disclosure is not limited to this. The wavelengths (or amplitudes) of the wave structures WS may also be arranged randomly, rather than according to the specific relationship described above.

[0070] like Figure 3 As shown, multiple wave structures WS (e.g., first wave structure WS1, second wave structure WS2, and third wave structure WS3) are sequentially arranged on the trailing edge 111B, starting from the outer edge 111C of the fan blade 111 and moving towards the inner edge 111D. In some embodiments, the multiple wave structures WS occupy only a portion of the length of the trailing edge 111B, and do not completely occupy the entire trailing edge 111B. For example, the wave structure WS closest to the inner edge 111D (e.g., the third wave structure WS3) is spaced apart from the inner edge 111D by a distance D, and the distance D is approximately 10% or more of the total length of the trailing edge 111B, such as 10%, 20%, 30%, 33%, 40%, 50%, 60%, 66%, 70%, 80%, or any range or value between the above values, but this disclosure is not limited thereto. In some embodiments, the distance D occupies 1 / 2 to 2 / 3 of the total length of the trailing edge. In other words, the wave structure WS may be provided only at approximately 1 / 2 to 2 / 3 of the total length of the trailing edge 111B, and not at the remaining locations of the trailing edge 111B. However, this disclosure is not limited to this.

[0071] In other embodiments, the wave structure WS closest to the inner edge 111D (e.g., the third wave structure WS3) can be directly connected to the inner edge 111D. In other words, the wave structure WS can be positioned along the entire length of the trailing edge 111B, i.e., the distance D is substantially 0. By adjusting the distribution range of the wave structure WS along the total length of the trailing edge 111B, the gas streamline of the wake can be further altered to allow for fine-tuning to meet the design requirements of different products.

[0072] like Figure 3As shown, the side of the leading edge 111A adjacent to the outer edge 111C is raised to a first height H1 in a direction away from the base 101, while the side of the trailing edge 111B adjacent to the outer edge 111C is raised to a second height H2 in a direction towards the base 101. By raising the outer edge 111C of the fan blade 111, the direction of airflow from the fan module 1 can be controlled. In some embodiments, the second height H2 is less than the first height H1. For example, the second height H2 can be any value or range between 90%, 80%, 70%, 60%, 50%, 40% of the first height H1 or the above values, but this disclosure is not limited thereto.

[0073] In some embodiments, the materials of the troughs 110 and the blades 111 in the impeller 11 may be similar or the same, but this disclosure is not limited thereto. For example, the same polymer material may be used to form the troughs 110 and the blades 111 in the impeller 11. For example, the various components in the impeller 11 may be integrally formed. Alternatively, different materials may be used to form the troughs 110 and the blades 111. For example, to improve the overall mechanical strength of the impeller 11 and maintain the lightweight of the device, metal may be used to form the troughs 110 and a polymer material may be used to form the blades 111.

[0074] To verify the effect of the wave structure WS, this disclosure compares a comparative example with an embodiment. The difference between the comparative example and the embodiment is that the trailing edge 111B of the fan blade 111 in the embodiment is provided with... Figure 3 or Figure 4 The wave structure WS is shown in the example, while the comparative example does not have a wave structure WS on the trailing edge 111B. The simplified test conditions are shown in Table 1 below:

[0075] Table 1

[0076] rotational speed 2450rpm 2450rpm Number of fan blades 7 7 Fan blade pass-through frequency (BPF) 285.8Hz 285.8Hz 7th harmonic 67dB 63dB Total noise 79.5dB 77.7dB

[0077] Specifically, Table 1 shows the aeroacoustic noise measurement results for the blade-passing frequency (BPF) under the same conditions (speed, number of blades). First, it can be observed that the peak noise level of the 7th harmonic (7x noise) decreases from approximately 67 dB to approximately 63 dB. This is based on the energy formula for sound. The noise energy (i.e., measured power) of the 7th harmonic decreased by approximately 2.5 times. In other words, the noise energy (or measured power) of the 7th harmonic was reduced to approximately 40% of its original value. Furthermore, the peak noise level of the total noise decreased from approximately 79.5 dB to 77.7 dB, and according to the energy formula described above, the noise energy (i.e., measured power) of the total noise decreased by approximately 1.5 times. In other words, the noise energy (or measured power) of the total noise was reduced to approximately 66% of its original value. Therefore, it can be understood that the wave structure WS can indeed effectively improve the gas streamlines of the wake.

[0078] In summary, this disclosure provides a fan module that effectively generates smooth airflow by setting multiple wave structures at the trailing edge of the fan blades, thereby improving vibration, noise and operating efficiency.

[0079] Several embodiments have been summarized above to enable those skilled in the art to better understand the viewpoints of the embodiments disclosed herein. Those skilled in the art should understand that other processes and structures can be designed or modified based on the embodiments disclosed herein to achieve the same purpose and / or advantages as the embodiments described herein. Those skilled in the art should also understand that such equivalent processes and structures do not depart from the spirit and scope of this disclosure, and that various changes, substitutions, and replacements can be made without departing from the spirit and scope of this disclosure.

Claims

1. A fan module, characterized in that, include: The frame includes an outer frame, a base, and multiple ribs, wherein the base is disposed in the outer frame via the multiple ribs; as well as An impeller connected to the frame, wherein the impeller comprises: The valley, pivotally connected to the base of the frame via a pivot; and Multiple fan blades are disposed on the trough, wherein each of the multiple fan blades has a leading edge and a trailing edge extending from the trough toward the outer frame. The trailing edge of each of the plurality of fan blades has a plurality of wave structures, and the waveforms or amplitudes of adjacent wave structures are different.

2. The fan module according to claim 1, characterized in that, The multiple wave structures have sinusoidal curves.

3. The fan module according to claim 1, characterized in that, The wavelengths of the multiple wave structures gradually decrease from the side adjacent to the trough toward the outer frame.

4. The fan module according to claim 1, characterized in that, The wavelengths of the multiple wave structures gradually increase from the side adjacent to the trough towards the outer frame.

5. The fan module according to claim 1, characterized in that, Each of the plurality of blades further has an inner edge and an outer edge opposite to each other, the inner edge and the outer edge being located between the leading edge and the trailing edge, and the inner edge being connected to the valence. Among the plurality of wave structures, the one closest to the inner edge is directly connected to the inner edge.

6. The fan module according to claim 1, characterized in that, Each of the plurality of blades further has an inner edge and an outer edge opposite to each other, the inner edge and the outer edge being located between the leading edge and the trailing edge, and the inner edge being connected to the valence. Among the plurality of wave structures, the one closest to the inner edge is separated from the inner edge by a distance.

7. The fan module according to claim 6, characterized in that, The distance is between 1 / 2 and 2 / 3 of the total length of the trailing edge.

8. The fan module according to claim 1, characterized in that, Each of the plurality of blades further has inner and outer edges opposite to each other, the inner and outer edges being located between the leading and trailing edges, and the inner edge being connected to the valence. The side of the leading edge adjacent to the outer edge is raised to a first height in a direction away from the base.

9. The fan module according to claim 8, characterized in that, The side of the rear edge adjacent to the outer edge is raised to a second height towards the base.

10. The fan module according to claim 9, characterized in that, The second height is smaller than the first height.

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