Fan frame soundproof structure

Abstract

This invention relates to a fan frame noise reduction structure, comprising a frame having a top and a bottom, and an airflow channel in the middle of the frame extending from the top to the bottom. The airflow channel forms an air inlet and an air outlet at the top and bottom, respectively. A noise reduction zone is provided between the airflow channel and an outer edge of the frame in at least one area of ​​the frame. At least one noise reduction unit is provided on the noise reduction zone, located between the top and the bottom and not connected to the airflow channel. The at least one noise reduction unit has a cavity that is sealed between the top and the bottom and does not extend through the top and bottom, thereby isolating airflow noise and absorbing frame vibration and its noise.

Description

Technical Field

[0001] This invention relates to a fan frame, and more particularly to a fan frame noise reduction structure. Background Technology

[0002] With the continuous advancement of technology, integrated circuits and electronic components are becoming increasingly miniaturized, enabling higher-density configurations and resulting in powerful computing capabilities and functionality. However, this also necessitates effective heat dissipation to maintain normal operating temperatures. Common cooling fans utilize rotating blades to drive airflow for efficient cooling. However, typical cooling fans often produce unpleasant noise during operation. This noise is primarily caused by the rotating blades driving airflow into the flow channel, resulting in vibration and impact noise from the fan frame, creating a wideband of noise. This is a problem that the field of cooling fan technology seeks to overcome.

[0003] Therefore, how to solve the above-mentioned problems and deficiencies is the direction that the inventors of this case and related manufacturers in this industry urgently want to study and improve. Summary of the Invention

[0004] The purpose of this invention is to provide a fan frame noise reduction structure that can absorb frame vibration and reduce broadband noise generated by vibration and airflow impact.

[0005] To achieve the above objectives, the present invention provides a fan frame noise reduction structure, characterized in that it comprises:

[0006] A frame has a top and a bottom, and an airflow channel is provided in the middle of the frame, the airflow channel extending from the top to the bottom. The airflow channel forms an air inlet and an air outlet at the top and the bottom, respectively. A silencing zone is provided between the airflow channel and an outer edge of the frame in at least one area of ​​the frame. At least one silencing unit is provided on the silencing zone. The silencing unit is located between the top and the bottom and is not connected to the airflow channel. The at least one silencing unit has a cavity that is closed between the top and the bottom and does not extend through the top and the bottom.

[0007] The aforementioned fan frame noise reduction structure, wherein: the frame has a plurality of corner regions located at the four corners of the frame, and the cavity of the at least one noise reduction unit is located within the noise reduction area of ​​at least one or all of the corner regions.

[0008] The aforementioned fan frame noise reduction structure, wherein the noise reduction unit is a hole or groove.

[0009] The aforementioned fan frame noise reduction structure includes an upper body and a lower body that are joined together. The upper body and the lower body each have a corresponding opposite side. The cavity of the at least one noise reduction unit has an opening. The opening is located on the opposite side of the upper body and the lower body or on one of the opposite sides, and the opening is closed by the opposite side.

[0010] The aforementioned fan frame noise reduction structure, wherein the noise reduction unit has a cross-section that is square, circular, triangular, arc-shaped, elliptical, elongated, or irregular.

[0011] The fan frame noise reduction structure wherein: at least one noise reduction unit is arranged in a single row or multiple rows in the noise reduction area.

[0012] By means of the present invention, the cavity of the silencing unit is enclosed between the top and bottom of the frame, thereby effectively isolating noise and effectively absorbing (reducing) the vibration of the frame and reducing the broadband noise generated by the vibration. Attached Figure Description

[0013] Figure 1 This is a three-dimensional exploded view of the present invention.

[0014] Figure 2 This is a schematic cross-sectional view of the present invention.

[0015] Figure 3 This is a top view of a cross-section of another embodiment of the sound-absorbing unit of the upper and lower bodies of the present invention.

[0016] Figure 4 This is a spectrum comparison diagram of the present invention and existing fan broadband noise.

[0017] Explanation of reference numerals in the attached figures: Fan frame noise reduction structure -1; Frame -11; Upper body -112; Top side -1121; Bottom side -1122; Upper channel -1124; Lower body -113; Top side -1131; Bottom side -1132; Lower channel -1134; Top -114; Bottom -115; Noise reduction area -116; Noise reduction unit -117; Cavity -1171; Opening -1172; Outer edge of frame -118; Airflow channel -12; Inner wall of channel -121; Outer edge of channel -122; Air inlet -13; Air outlet -14; Shaft seat -15; Corner area -16; Screw hole -161; Fan -2; Stator assembly -21; Fan wheel -22; Blade -221; Support part -23; Curve of this invention -31; Conventional curve -32. Detailed Implementation

[0018] The above-mentioned objectives of the present invention and its structural and functional characteristics will be described with reference to the preferred embodiments in the accompanying drawings.

[0019] This invention provides a fan frame noise reduction structure 1, please refer to [link / reference]. Figure 1 , Figure 2 The fan frame noise reduction structure 1 includes a frame 11, which can be integrally formed or composed of multiple parts. In this embodiment, it is described as a multi-part assembly. The frame 11 includes a rectangular upper body 112 and a rectangular lower body 113. The upper body 112 and the lower body 113 each have a top side 1121, 1131 and a bottom side 1122, 1132. The bottom side 1122 of the upper body 112 and the top side 1131 of the lower body 113 are connected in series to form the frame 11 (such as an axial fan frame). The top side 1121 of the upper body 112 and the bottom side 1132 of the lower body 113 are respectively a top 114 and a bottom 115 of the frame 11.

[0020] The upper body 112 and the lower body 113 each have an upper channel 1124 and a lower channel 1134 at their middle sections, respectively extending from their top sides 1121 and 1131 to their bottom sides 1122 and 1132. The upper channel 1124 of the upper body 112 and the lower channel 1134 of the lower body 113 are connected in series to form an airflow channel 12 extending from the top 114 of the frame 11 to the bottom 115. An air inlet 13 and an air outlet 14 are formed at the top 114 and bottom 115 of the frame 11, respectively, which are connected to the airflow channel 12. The airflow channel 12 has an inner wall 121 that defines an outer edge 122.

[0021] A bearing seat 15 is provided at the center near the air outlet 14. The bearing seat 15 is connected to the inner wall 121 of the lower channel 1134 of the airflow channel 12 via a plurality of support parts 23 (such as ribs or vanes). A corner region 16 is formed at each of the four corners of the upper body 112 and the lower body 113 (i.e., the frame 11). Each corner region 16 of the upper body 112 and the lower body 113 has a screw hole 161 extending from its respective top side 1121, 1131 to its bottom side 1122, 1132 (i.e., from the top 114 of the frame 11 to the bottom 115). In another alternative embodiment, the frame 11 is a single fan frame.

[0022] See also Figure 1 , Figure 2A noise-absorbing area 116 is provided on the frame 11 and / or at least one region (corner) of the frame 11. This area is located between the outer edge 122 of the airflow channel 12 and the outer edge 118 of the frame, and may be located in the corner region 16 between the screw hole 161 and the outer edge 122 of the channel. In this embodiment, the aforementioned noise-absorbing area 116 is provided in all four corner regions 16 of the upper body 112 and the lower body 113 (i.e., the frame 11). However, this is not a limitation. In another embodiment, the aforementioned noise-absorbing area 116 is provided in one or more corner regions 16 of both the upper body 112 and the lower body 113.

[0023] Furthermore, each corner region 16 of the upper body 112 and the lower body 113 has at least one silencing unit 117 located between its respective top sides 1121, 1131 and bottom sides 1122, 1132, and in this embodiment, these silencing units 117 of the upper body 112 and the lower body 113 are represented as a plurality of circular holes. However, this is not a limitation; in specific embodiments, please refer to [reference needed]. Figure 3 This is a top view of a cross-section of another embodiment of the silencing unit 117 of the upper body 112 and the lower body 113. The silencing unit 117 may be in the form of square, triangular, arc-shaped, elliptical, long strip or irregularly shaped holes (or grooves).

[0024] In detail, the plurality of silencing units 117 of the upper body 112 and the lower body 113 are recessed in the four corner regions 16 of the bottom side 1122 of the upper body 112 and the top side 1131 of the lower body 113, and are arranged in multiple rows from the outer edge 122 of the airflow channel 12 towards the outer edge 118 of the frame 11. Each row of the silencing units 117 of the upper body 112 and the lower body 113 consists of a plurality of silencing units 117, which are spaced apart along the outer edge 122 of the airflow channel 12, and are separated (blocked) from the corresponding upper channel 1124 and lower channel 1134 by the inner walls 121 of the channels of the upper and lower bodies 112 and 113, respectively, so that each silencing unit 117 of the upper body 112 and the lower body 113 is not connected to the airflow channel 12.

[0025] Furthermore, each silencing unit 117 of the upper body 112 and the lower body 113 has a cavity 1171 that is enclosed between the top 114 and the bottom 115 of the frame 11 and does not penetrate the top 114 and the bottom 115, so that the cavity 1171 of the upper body 112 and the lower body 113 is not connected to the outside, and the vibration of the frame 11 and the noise generated by the vibration are absorbed by the enclosed cavities 1171 of the upper body 112 and the lower body 113.

[0026] See also Figure 2Each silencing unit 117 of the upper body 112 and the lower body 113 has an opening 1172 in its cavity 1171, which is respectively located on the opposite sides of the upper body 112 and the lower body 113 (i.e., the bottom side 1122 of the upper body 112 and the top side 1121 of the lower body 113). The upper body 112 connects to the lower body 113, thereby closing the openings 1172 on the opposite sides. This allows the cavity 1171 of the upper body 112 to connect to the cavity 1171 of the lower body 113 through the opening 1172 on the upper body 112. However, this is not a limitation; the openings 1172 on the opposite sides of the upper body 112 and the lower body 113 may be staggered and not connected.

[0027] Although the aforementioned description indicates that the silencing units 117 of the upper body 112 and lower body 113 are arranged in multiple rows in the four corner regions 16 of the upper body 112 and lower body 113, in another embodiment, such as Figure 3 As shown, the silencing unit 117 consists of one or more holes or grooves arranged in a single row in at least one or four corner regions 16 of the upper body 112 and / or lower body 113.

[0028] Although the openings 1172 of the cavities 1171 of the silencing units 117 of the upper body 112 and the lower body 113 are located on opposite sides of the upper body 112 and the lower body 113, in another embodiment, the openings 1172 of the cavities 1171 of the silencing units 117 are located on one of the opposite sides of the upper body 112 and the lower body 113 (such as the bottom side 1122 of the upper body 112 or the top side 1131 of the lower body 113).

[0029] In another embodiment, the opening 1172 of the cavity 1171 of the silencing unit 117 is located on the top side 1121 of the upper body 112 and / or the bottom side 1132 of the lower body 113, and the opening 1172 is closed by at least one sealing member, so that the cavity 1171 of the silencing unit 117 is closed in the upper body 112 and / or the lower body 113 and is not connected to the outside world, thereby absorbing the vibration of the upper and lower bodies 112 and 113 and the broadband noise generated therefrom.

[0030] See also Figure 1A stator assembly 21 is fitted on the outer side of the bearing seat 15 of the frame 11, and the bearing seat 15 is pivotally connected to a fan wheel 22 with a plurality of blades 221 housed in the airflow channel 12, so that the frame 11, the stator assembly 21 and the fan wheel 22 constitute a fan 2 (such as an axial flow fan 2). When the fan wheel 22 of the fan 2 rotates and attracts airflow, the air inlet 13 of the upper body 112 guides the airflow into the airflow channel 12. During the process of the blades 221 of the fan wheel 22 pushing the airflow to pressurize it, the airflow will hit the inner wall 121 of the airflow channel 12, causing the frame 11 to vibrate. At this time, the vibration is absorbed or blocked by the cavity 1171 of the silencing units 117 in the upper and lower bodies 112 and 113, and the broadband noise caused by the vibration is reduced. The airflow pressurized by the blades 221 flows out from the air outlet 14.

[0031] See also Figure 4 This is a comparison graph of the frequency spectrum of the present invention and conventional fan broadband noise. The vertical axis represents the sound pressure level (SPL), and its unit is dB(SPL); the horizontal axis represents the frequency (f), and its unit is Hertz (Hz). As shown in the figure, curve 31 (solid line) of the present invention is lower than curve 32 (dashed line) of the conventional invention, and the fan broadband noise of the present invention, 49.17 dB(SPL), is significantly lower than the conventional fan broadband noise of 50.61 dB(SPL). Therefore, the present invention effectively reduces fan broadband noise compared to the prior art.

[0032] Therefore, by means of the present invention, the cavity 1171 of the noise reduction unit 117 is enclosed in the upper body 112 and / or lower body 113 of the frame 11, thereby effectively isolating noise and effectively absorbing (reducing) the vibration of the frame 11 and reducing the broadband noise generated by the vibration, thereby effectively achieving the noise reduction effect.

Claims

1. A fan frame noise reduction structure, characterized in that, include: A frame has a top and a bottom, and an airflow channel is provided in the middle of the frame, the airflow channel extending from the top to the bottom. The airflow channel forms an air inlet and an air outlet at the top and the bottom, respectively. A silencing zone is provided between the airflow channel and an outer edge of the frame in at least one area of ​​the frame. At least one silencing unit is provided on the silencing zone. The silencing unit is located between the top and the bottom and is not connected to the airflow channel. The at least one silencing unit has a cavity, which is closed between the top and the bottom. The cavity is positioned relative to the airflow channel in the direction from the air inlet to the air outlet and does not extend through the top and the bottom.

2. The fan frame noise reduction structure as described in claim 1, characterized in that: The frame has a plurality of corner areas located at the four corners of the frame, and the cavity of the at least one silencing unit is located in the silencing area of ​​at least one or all of the corner areas.

3. The fan frame noise reduction structure as described in claim 1, characterized in that: The noise reduction unit is a hole or groove.

4. The fan frame noise reduction structure as described in claim 1, characterized in that: The frame includes an upper body and a lower body that are joined together. The upper body and the lower body each have a corresponding opposite side. The cavity of the at least one silencing unit has an opening. The opening is located on the opposite side of the upper body and the lower body or on one of the opposite sides of the two bodies, and the opening is closed by the opposite side.

5. The fan frame noise reduction structure as described in claim 4, characterized in that: The cross-section of the silencing unit can be square, circular, triangular, arc-shaped, elliptical, rectangular, or irregular.

6. The fan frame noise reduction structure as described in claim 1 or 4, characterized in that: The at least one silencing unit is arranged in a single row or multiple rows in the silencing area.

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