TWM630341U - Fan frame turbulent structure - Google Patents

Abstract

The present invention creates a turbulent flow structure for a fan frame, including a frame body with an air inlet side and an air outlet side respectively disposed on both sides of the frame body, and an airflow channel in the middle of the frame body penetrating from the air inlet side to the the air outlet side, and the air flow channel has a channel inner wall connecting the air inlet side and the air outlet side, the air inlet side has an inlet connected to the air flow channel, the inlet has a crushing area located on the air inlet side and the air outlet side Between the inner walls of the channel, the crushing area includes a plurality of densely distributed crushing units, and a plurality of gaps are formed between the crushing units to communicate with the airflow channel, and the crushing units are crushed and sucked from the air inlet side. An air flow is generated, so that a part of the air flow is fragmented and dispersed into the gap turbulent flow through the gaps between the fine fragmentation units and enters the air flow channel, so as to achieve the effect of reducing broadband noise.

Description

Fan Frame Turbulence Structure

This creation relates to a fan frame, especially a fan frame turbulence structure.

With the improvement of the execution efficiency of electronic components, the demand for heat dissipation has increased rapidly. Therefore, in addition to passive heat dissipation, active heat dissipation (such as a fan) is also used; however, as the temperature increases, the fan speed also increases and its noise also changes. Therefore, noise reduction is one of the first priorities of active cooling. The active heat dissipation, such as an axial fan, includes a fan frame and a fan gear train with a plurality of blades pivoted in the fan frame, and the fan frame is provided with an air inlet side and an air outlet side respectively disposed on the fan frame. sides. However, as the rotational speed of the axial flow fan increases, the noise increases accordingly. The noise types of the above-mentioned axial fans can be basically divided into broadband noise and narrow-band noise. In terms of broadband noise, there are two influencing factors: first, the noise generated by the vortex at the end of the blade; The noise produced by a large turbulent airflow. At present, there are two mainstream methods in the industry to solve the broadband noise: one is to reduce the gap between the rear ends of the blades of the fan wheel and the inner side of the opposite fan frame, and the other is to reduce the air inlet side of the fan frame. A rectifying device (such as a wave guide plate) is installed on the upper part, but among these two methods, the noise reduction effect is more obvious by reducing the gap between the rear ends of the blades of the fan wheel and the inner side of the opposite fan frame. This method requires strict control of the dimensional tolerances of the blades in actual manufacturing, and the manufacturing accuracy is relatively high, which leads to a relative increase in cost. Furthermore, the gap between the rear end of the blades and the inner side of the relative sector frame is reduced, and it is easy to be caught by foreign objects. There is a risk that the fan wheel will be blocked and burnt out during operation. Therefore, how to solve the above-mentioned problems and deficiencies is the direction that the creator of this case and the relevant manufacturers engaged in this industry are eager to research and improve.

One of the objectives of this creation is to provide a fan frame turbulence structure that can fragment and disperse a chaotic airflow sucked into the air inlet side of a fan frame into a plurality of finer gap turbulence and reduce the vortex at the tail end of the blade, so as to effectively reduce noise. In order to achieve the above-mentioned purpose, the present invention provides a fan frame turbulence structure including: a frame body has an air inlet side and an air outlet side respectively disposed on both sides of the frame body, and an air flow channel is provided in the middle of the frame body. It runs from the air inlet side to the air outlet side, and the air flow channel has a channel inner wall connecting the air inlet side and the air outlet side, the air inlet side has an inlet that communicates with the air flow channel, and the inlet has a shroud. The crushing area is located between the air inlet side and the inner wall of the channel, and the crushing area includes a plurality of finely divided units that are densely distributed, and a plurality of gaps are formed between the finely divided units to communicate with the airflow channel. An airflow sucked from the air inlet side is broken up by the finely divided units in the crushing area of the present invention, so that a part of the air flow is fragmented and dispersed into plural numbers through the gaps between the finely divided units. The interstitial turbulent flow flows into the airflow channel, thereby effectively improving the intake of a chaotic airflow on the air inlet side, thereby effectively achieving the effect of reducing broadband noise. In addition, by pivoting the fan frame turbulence structure of the present invention and a fan wheel to form a fan, it is possible to effectively reduce the eddy current at the tail end of the fan blade and reduce the noise generated by the eddy current.

The above-mentioned purpose of the present invention and its structural and functional characteristics will be described with reference to the preferred embodiments of the accompanying drawings. The present invention provides a fan frame turbulence structure 1, please refer to FIG. 1, the fan frame turbulence structure 1 includes a frame body 11. In this embodiment, the frame body 11 is a single fan frame (such as an axial fan frame), or it can be A series fan is selected. The two sides of the frame body 11 are an air inlet side 111 and an air outlet side 112 respectively, and there is an air passage 115 in the middle of the frame body 11 which is penetrated by the air inlet side 111 to the air outlet side 112 , and the airflow channel 115 has a channel inner wall 1151 respectively connected to the air inlet side 111 and the air outlet side 112 . Referring back to FIG. 1, the air inlet side 111 has an inlet 1110, the air outlet side 112 has an outlet 1121, the inlet 1110 and the outlet 1121 are connected to the airflow channel 115, and a center of the outlet 1121 is provided with a The shaft seat 113 is connected to the inner channel wall 1151 of the frame body 11 by a plurality of supporting parts 114 (eg, ribs or stationary vanes). The inlet 1110 has an air inlet surface 1110a and a fragmentation area 1111 located between the air inlet side 111 and the inner wall 1151 of the channel, respectively. The air inlet surface 1110a is provided with a wind guide surface 1110b and a setting surface 1110c located on the air inlet surface 1110a. Between the channel inner wall 1151 and the wind guide surface 1110b, the wind guide surface 1110b is an inclined surface or a vertical surface, and the setting surface 1110c is inclined or perpendicular to the outlet 1121. The crushing area 1111 is disposed on the setting surface 1110c, and includes a plurality of finely divided units 1112 distributed in a dense or scattered state, and the finely divided units 1112 are integrally or non-integratedly formed on the setting surface 1110c On the setting surface 1110c, the shredding units 1112 can be selectively arranged in a single row in parallel or in multiple rows and densely arranged on the setting surface 1110c, and there is a gap 1117 between the shredding units 1112. For example, but not limitation, the size of the shredding units 1112 is preferably less than or equal to 1 millimeter (mm), and the width of the gaps 1117 formed between the shredding units 1112 is also less than or equal to 1 mm (mm), to allow at least or more than, for example, 25 (columns) of finely divided units 1112 to be arranged in a single row or multiple rows of juxtaposed units per unit area that can be implemented on the reducing zone 1111 per square centimeter. In addition, the fine-shredding units 1112 in the shredding zone 1111 of the present embodiment are represented as rectangular cylinders, which are densely formed on the setting surface 1110c of the air inlet side 111 in a manner of multiple rows and juxtaposed intervals through machining (eg, cutting pins). on, but not limited to. In other alternative embodiments, the shredding units 1112 can be selected as equal-length or unequal-length polygonal cylinders (eg, triangular cylinders, rectangular cylinders), hemispheres, and regular shapes (eg, X-shaped or approximately E-shaped). fonts) or irregular shapes (eg particles) are combined on the setting surface 1110c by way of fitting, gluing or pasting Velcro. Each of the aforementioned rows includes a plurality of shredding units 1112 arranged at the same level. An upper side 1113 and a lower side 1114 are flush with the upper side 1113 and the lower side 1114 of another shredding unit 1112 adjacent to each other. The equal shredding units 1112 are arranged at the same level, but not limited thereto, the upper side 1113 and the lower side 1114 of the shredding units 1112 in each row are staggered so as not to be flush with the upper side 1113 of another adjacent shredding unit 1112 and the lower side 1114 are not arranged at the same level. Furthermore, two side walls 1115 and a convex side 1116 are respectively connected between the upper side 1113 and the lower side 1114 of each shredding unit 1112 . The convex side 1116 faces the direction of the airflow channel 115 and is axially flush with the inside of the channel. The wall 1151, so that the convex sides 1116 do not exceed the inner wall 1151 of the channel, but not limited to this, the length (or height) of each finer unit 1112 is not the same length, such as the upper row and the lower row The lengths of the shredding units 1112 gradually increase from the upper row to the lower row, or from the lower row to the upper row, so that the convex sides 1116 of the upper and lower shredding units 1112 are not axially flush with each other. The gap 1117 is formed between the opposite side walls 1115 of each two of the shredding units 1112 in each row to communicate with the airflow channel 115 . In this embodiment, the gaps 1117 are equal (FIG. 1). However, in another embodiment, the gaps 1117 between the shredding units 1112 are not equal. In this way, when an air flow is sucked in from the air guide surface 1110b of the air inlet side 111 of the frame body 11, part of the air flow will hit the fine crushing units 1112 on the crushing area 1111 and be broken, so that the part The airflow is fragmented and dispersed into a plurality of finer gaps through the gaps 1117, and the turbulent flow flows into the airflow channel 115, so that the airflow disturbance of the gap turbulence is small to reduce noise, so it effectively improves the air intake on the air inlet side 111. Broadband noise produced by large airflow disturbances in a chaotic airflow. In addition, referring to FIG. 1, the outer side of the shaft seat 113 of the frame body 11 is sleeved with a stator group 21, and the shaft seat 113 is in contact with a fan wheel 22 with a plurality of blades 221 accommodated in the airflow channel 115 By pivoting together, the frame body 11 , the stator group 21 and the fan wheel 22 form a fan 2 (eg, an axial flow fan). When the fan wheel 22 of the fan 2 rotates to attract the airflow, the part of the airflow sucked in from the air inlet side 111 of the frame body 11 is broken and divided by the crushing units 1112 , so that the part of the airflow passes through the gaps 1117 to be crushed The turbulent flow is dispersed into the gaps and flows into the airflow channel 115, so that the airflow passing through the distance between the trailing ends of the blades 221 of the fan wheel 22 and the inner wall 1151 of the channel is less disturbed, so as to reduce (reduce the ) The vortex generated by the rear end of the blades 221 and the broadband noise generated by the vortex are reduced. The gap turbulence flowing into the airflow channel 115 is pressurized by the blades 221 of the fan wheel 22 and then exits the outlet of the air outlet side 112. 1121 outflow. In addition, please refer to Figure 2 for the comparison of the frequency spectrum between the creation and the 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, the curve 31 (red curve) of the present creation is lower than the conventional curve 32 (green curve), and the fan broadband noise of the present creation is 50.36dB (SPL), which is significantly lower than the conventional fan broadband noise of 51.73 dB (SPL), so the present invention effectively reduces the fan's broadband noise compared to the conventional one. Although the frame body 11 is shown as a single sash frame above, it is not limited to this. In another alternative embodiment, the frame body 11 includes an upper frame portion and a lower frame portion connected in series to form the frame body, or the frame body 11 is used as a separate upper frame portion to be disposed on another fan frame (such as the fan frame of an axial flow fan), the air inlet side is used as the device on the air inlet side. Therefore, according to the present invention, a large number of and densely arranged finer units 1112 are arranged on the air inlet side 111 to improve the intake side 111 from sucking a chaotic airflow and reduce the noise generated by the vortex at the rear end of the blades 221, thereby effectively Achieve the effect of reducing broadband noise and making it simple.

1: Fan frame turbulent flow structure 11: Frame 111: Inlet side 1110: Entrance 1110a: Inlet side 1110b: Wind guide surface 1110c: Set Surface 1111: Fragmentation area 1112: Fine crushing unit 1113: upper side 1114: lower side 1115: Both side walls 1116: convex side 1117: Clearance 112: Outlet side 1121: Exit 113: Shaft seat 114: Support Department 115: Airflow channel 1151: Channel inner wall 2: Fan 21: stator group 22: Fan wheel 221: Blade 31: This creative curve 32: Learning Curve

Figure 1 is a three-dimensional exploded schematic diagram of the creation. Figure 2 is a comparison diagram of the frequency spectrum between the original creation and the conventional fan broadband noise.

1: Fan frame turbulent flow structure

11: Frame

111: Inlet side

1110: Entrance

1110a: Inlet side

1110b: Wind guide surface

1110c: Set Surface

1111: Fragmentation area

1112: Fine crushing unit

1113: upper side

1114: lower side

1115: Both side walls

1116: convex side

1117: Clearance

112: Outlet side

1121: Exit

113: Shaft seat

114: Support Department

115: Airflow channel

1151: Channel inner wall

2: Fan

21: stator group

22: Fan wheel

221: Blade

Claims (8)

A fan frame turbulence structure, comprising: a frame body, with an air inlet side and an air outlet side respectively disposed on both sides of the frame body, and an air flow channel in the middle of the frame body, the air flow channel runs from the air inlet side to the air outlet side , and the air flow channel has a channel inner wall connecting the air inlet side and the air outlet side, the air inlet side has an inlet connecting the air flow channel, and the inlet has a crushing area located on the air inlet side and the inner wall of the channel In between, the crushing area includes a plurality of densely distributed fine crushing units, and a plurality of gaps are formed between the fine crushing units to communicate with the airflow channel, and an airflow sucked from the air inlet side is broken by the fine crushing units, A part of the airflow is dispersed into a plurality of gap turbulent flows into the airflow channel through the gaps between the fine-reducing units. The fan frame turbulent flow structure as described in claim 1, wherein each finely divided unit has an upper side and a lower side, the upper sides of the finely divided units are flush with or not flush with each other, and the finely divided units The lower sides of the are flush with each other or not flush with each other. The fan frame turbulent flow structure as described in claim 1, wherein the crushing units are arranged in a single row or multiple rows in parallel on the crushing area. The fan frame turbulent flow structure as described in claim 3, wherein the finer units are integrally formed or non-integrally formed on the crushing area. The fan frame turbulent flow structure as described in claim 1, wherein the combination of the finer units is selected to be combined in the crushing area by machining, fitting, gluing or velcro. The fan frame turbulence structure as described in claim 1, wherein the frame body is a single fan frame. The fan frame turbulent flow structure as described in claim 1, wherein the shape of the finer units are equal or unequal length polygonal cylinders, hemispheres, regular shapes or irregular shapes. The fan frame turbulent flow structure as described in claim 1, wherein the inlet has an air inlet surface located between the air inlet side and the inner wall of the passage, and the air inlet surface is provided with a wind guide surface and a setting surface. Located between the inner wall of the channel and the air guiding surface, the crushing zone is arranged on the setting surface.

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