CN114837999A

CN114837999A - Turbulence structure of fan frame

Info

Publication number: CN114837999A
Application number: CN202210364819.0A
Authority: CN
Inventors: 赖华; 谈泽华
Original assignee: Asia Vital Components Shenzhen Co Ltd
Current assignee: Asia Vital Components Shenzhen Co Ltd
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2022-08-02

Abstract

The invention relates to a fan frame turbulence structure, which comprises a frame body provided with an air inlet side and an air outlet side which are respectively arranged at two sides of the frame body, and an air flow channel is arranged in the middle of the frame body and penetrates from the air inlet side to the air outlet side, the air flow channel is provided with a channel inner wall which is connected with the air inlet side and the air outlet side, the air inlet side is provided with an inlet communicated with the airflow channel, the inlet is provided with a fragmentation zone positioned between the air inlet side and the inner wall of the channel, the crushing area comprises a plurality of finely-crushing units which are densely distributed, a plurality of gaps are formed among the finely-crushing units and communicated with the airflow channel, and an airflow sucked from the air inlet side is crushed by the finely-crushing units, so that a part of the airflow is crushed and dispersed into gap turbulence through the gaps among the finely-crushing units and enters the airflow channel, and the effect of reducing broadband noise is achieved.

Description

Turbulence structure of fan frame

Technical Field

The present disclosure relates to fan frames, and particularly to a fan frame turbulence structure.

Background

With the improvement of the execution efficiency of the electronic component, the requirement of heat dissipation is greatly increased, so that besides passive heat dissipation, active heat dissipation (such as a fan) is also matched; however, the noise of the fan increases with the increasing of the temperature, so that the noise reduction is the first important one of active heat dissipation. The active heat dissipation device such as axial flow fan comprises a fan frame and a fan wheel with a plurality of blades, wherein the fan wheel is pivoted in the fan frame, and the fan frame is provided with an air inlet side and an air outlet side which are respectively arranged at two sides of the fan frame. However, when the axial flow fan is operated, the noise is relatively increased along with the higher rotating speed.

The noise types of the axial flow fan can be divided into broadband noise and narrow-band noise, wherein the broadband noise has two influencing factors: firstly, noise generated by vortex at the tail end of the blade; secondly, the air inlet side sucks a mass of large chaotic air flow, and the air flow disturbance is large to generate noise. The main flow in the current industry is to reduce the gap between the tail end of the plurality of blades of the fan wheel and the inner side of the opposite fan frame, and the other method is to install a rectifying device (such as a waveguide plate) on the air inlet side of the fan frame, but in the two methods, the gap between the tail end of the plurality of blades of the fan wheel and the inner side of the opposite fan frame is reduced to obviously reduce the noise effect, but in the actual manufacturing, the method needs to strictly control the manufacturing precision of the dimensional tolerance of the plurality of blades, so that the cost is relatively improved, and the risk that the fan wheel is blocked and burned out in operation due to the fact that the gap between the tail end of the plurality of blades and the inner side of the opposite fan frame is reduced and easily blocked by foreign matters.

Therefore, how to solve the above problems and disadvantages is a direction in which the present inventors and related manufacturers in the industry desire to research and improve.

Disclosure of Invention

The invention aims to provide a fan frame turbulence structure which can suck a cluster of disordered airflow into an air inlet side of a fan frame, break and disperse the cluster of disordered airflow into a plurality of small gap turbulences and reduce vortex at the tail end of a blade so as to effectively reduce noise.

To achieve the above object, the present invention provides a fan frame turbulence structure, comprising:

the air inlet side is provided with an inlet opening communicated with the airflow channel, the inlet opening is provided with a fragmentation zone which is positioned between the air inlet side and the inner wall of the channel, the fragmentation zone comprises a plurality of densely distributed fine fragmentation units, a plurality of gaps are formed among the plurality of fine fragmentation units and communicated with the airflow channel, and an airflow sucked from the air inlet side is fragmented by the plurality of fine fragmentation units, so that a part of the airflow is fragmented and dispersed into a plurality of gap turbulences through the gaps among the plurality of fine fragmentation units and enters the airflow channel.

The fan frame turbulence structure, wherein: each of the plurality of reducing units has an upper side and a lower side, the upper sides of the plurality of reducing units are aligned or not aligned with each other, and the lower sides of the plurality of reducing units are aligned or not aligned with each other.

The fan frame turbulence structure, wherein: the plurality of fine crushing units are arranged on the crushing area in a single row or in multiple rows.

The fan frame turbulence structure, wherein: the plurality of reducing units are integrally formed or not integrally formed on the reducing region.

The fan frame turbulence structure, wherein: the combination mode of the plurality of fine crushing units is selected to combine in the crushing area by machining, embedding, bonding or sticking nylon buttons.

The fan frame turbulence structure, wherein: the frame body is a single fan frame.

The fan frame turbulence structure, wherein: the shape of the plurality of the reducing units is a polygonal cylinder or a hemisphere with equal length or unequal length.

The fan frame turbulence structure, wherein: the inlet is provided with an air inlet surface, the air inlet surface is positioned between the air inlet side and the inner wall of the channel, the air inlet surface is provided with an air guide surface and a setting surface, the air guide surface and the setting surface are positioned between the inner wall of the channel and the air guide surface, and the fragmentation zone is arranged on the setting surface.

The plurality of fine crushing units in the crushing area can crush the airflow sucked from the air inlet side, so that a part of the airflow is crushed and dispersed into a plurality of gap turbulences through the gaps among the plurality of fine crushing units and flows into the airflow channel, and the disordered airflow sucked from the air inlet side is effectively improved, and the effect of reducing broadband noise is effectively achieved. In addition, the fan frame turbulence structure and the fan wheel are pivoted to form the fan, so that the tail end eddy of the fan blade and the noise generated by the eddy can be effectively reduced.

Drawings

Fig. 1 is a schematic perspective exploded view of the present invention.

FIG. 2 is a comparison of the frequency spectrum of broadband noise of the fan according to the present invention and the conventional fan.

The reference numbers illustrate: a fan frame turbulence structure 1; a frame body 11; an air intake side 111; an inlet 1110; an inlet face 1110 a; a wind guiding surface 1110 b; a setting surface 1110 c; a fragmentation zone 1111; a shredding unit 1112; an upper side 1113; an underside 1114; two side walls 1115; an outer convex side 1116; a gap 1117; an air outlet side 112; an outlet 1121; a shaft seat 113; a support portion 114; an air flow passage 115; channel inner walls 1151; a fan 2; a stator group 21; a fan wheel 22; a blade 221; inventive curve 31; a conventional curve 32.

Detailed Description

The above objects, together with the structural and functional features thereof, are accomplished by the preferred embodiments according to the accompanying drawings.

Referring to fig. 1, the fan frame turbulence structure 1 includes a frame 11, in this embodiment, the frame 11 is a single fan frame (such as an axial fan frame), or may be a serial fan, two sides of the frame 11 are respectively an air inlet side 111 and an air outlet side 112, an air flow channel 115 is formed in the middle of the frame 11 and penetrates from the air inlet side 111 to the air outlet side 112, and the air flow channel 115 has a channel inner wall 1151 respectively connected to the air inlet side 111 and the air outlet side 112.

Referring 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 communicated with the airflow channel 115, and a shaft seat 113 is disposed at the center of the outlet 1121, the shaft seat 113 is connected to the channel inner wall 1151 of the frame 11 by a plurality of supporting portions 114 (e.g., ribs or stationary blades). The inlet 1110 has an air inlet surface 1110a and a fragmentation zone 1111 respectively located between the air inlet side 111 and the channel inner wall 1151, the air inlet surface 1110a has an air guiding surface 1110b and a setting surface 1110c located between the channel inner wall 1151 and the air guiding surface 1110b, the air guiding surface 1110b is an inclined surface or a vertical surface, and the setting surface 1110c is inclined or vertical to the outlet 1121.

The pulverizing zone 1111 is disposed on the setting surface 1110c and includes a plurality of fine pulverizing units 1112 distributed in a dense or sparse state, and the fine pulverizing units 1112 are integrally formed or non-integrally formed on the setting surface 1110c, and the fine pulverizing units 1112 can be disposed on the setting surface 1110c in a dense manner in a single row or in multiple rows, and the fine pulverizing units 1112 have a gap 1117 therebetween. For example, but not by way of limitation, the size of the plurality of fine reduction units 1112 is preferably less than or equal to 1 millimeter (mm), and the width of the gap 1117 formed between the plurality of fine reduction units 1112 is also less than or equal to 1 mm, so as to allow at least or more than, for example, 25 (pillar) fine reduction units 1112 to be densely arranged in a single row or in multiple rows in parallel within a unit area of square centimeters that can be implemented on the reduction zone 1111.

In addition, the plurality of fine crushing units 1112 in the crushing zone 1111 is shown as a rectangular cylinder, and is densely formed on the setting surface 1110c of the air intake side 111 in a plurality of rows in parallel at intervals by a mechanical process (e.g., cutting pins), but is not limited thereto. In other alternative embodiments, the plurality of reducing units 1112 can be selected to be polygonal cylinders (e.g., triangular cylinders, rectangular cylinders), hemispheres, regular shapes (e.g., X-shaped or substantially E-shaped), or irregular shapes (e.g., granules) with equal or different lengths, and can be engaged, adhered, or bonded to the mounting surface 1110c by nylon fasteners.

Each row includes a plurality of fine crushing units 1112 arranged in the same horizontal direction, and each fine crushing unit 1112 has an upper side 1113 and a lower side 1114 which are flush with and adjacent to each other, that is, the plurality of fine crushing units 1112 in the upper row and the lower row are arranged in the same horizontal direction, but not limited thereto, the upper side 1113 and the lower side 1114 of the plurality of fine crushing units 1112 in each row are staggered so as not to be flush with and adjacent to each other, that is, not in the same horizontal direction, of the upper side 1113 and the lower side 1114 of the other fine crushing unit 1112 in each row.

Furthermore, each fine crushing unit 1112 has two sidewalls 1115 and an outer convex side 1116 connected between the upper side 1113 and the lower side 1114, the outer convex side 1116 faces the direction of the airflow channel 115 and is axially aligned with the channel inner wall 1151, so that the plurality of outer convex sides 1116 do not exceed the channel inner wall 1151, but not limited thereto, the length (or height) of each fine crushing unit 1112 is different, for example, the length of the fine crushing units 1112 in the upper row and the lower row is gradually longer from the upper row to the lower row, or the length of the fine crushing units 1112 in the upper row and the lower row is gradually longer from the lower row to the upper row, so that the outer convex sides 1116 of the fine crushing units 1112 in the upper row and the lower row are not axially aligned with each other.

The gaps 1117 formed between the mutually opposite side walls 1115 of each row of two fine reduction units 1112 are communicated with the airflow channel 115, and in the embodiment, the gaps 1117 are equal (as shown in fig. 1). However, in another embodiment, the gaps 1117 between the plurality of fine pulverizing units 1112 are not equal. Thus, when an air flow is sucked from the air guide surface 1110b of the air inlet side 111 of the frame 11, a part of the air flow collides with the plurality of fine crushing units 1112 on the crushing zone 1111 and is crushed, so that the part of the air flow is crushed and dispersed into a plurality of fine gap turbulences through the plurality of gaps 1117 and flows into the air flow channel 115, and the noise is reduced by the small air flow disturbance of the plurality of gap turbulences, thereby effectively improving the broadband noise generated by the large air flow disturbance of a turbulent air flow sucked from the air inlet side 111.

In addition, referring to fig. 1, a stator set 21 is sleeved outside the shaft seat 113 of the frame 11, and the shaft seat 113 is pivoted with a fan 22 having a plurality of blades 221 accommodated in the airflow channel 115, so that the frame 11, the stator set 21 and the fan 22 form a fan 2 (such as an axial fan). When the fan wheel 22 of the fan 2 rotates to draw an air flow, the plural fine crushing units 1112 are used to crush and divide a part of the air flow sucked from the air inlet side 111 of the frame 11, so that the part of the air flow is crushed and dispersed into plural gap turbulences through the plural gaps 1117 to flow into the air flow channel 115, and then the air flow passing through a gap between the tail ends of the plural blades 221 of the fan wheel 22 and the channel inner wall 1151 is disturbed little to reduce (reduce) the vortex generated at the tail ends of the plural blades 221 and reduce the broadband noise generated by the vortex, and the gap turbulences flowing into the air flow channel 115 are pressurized by the plural blades 221 of the fan wheel 22 and then flow out from the outlet 1121 of the air outlet side 112. In addition, referring to fig. 2, which is a graph comparing frequency spectra of broadband noise of the fan according to the present invention and the conventional fan, the vertical axis represents Sound Pressure Level (SPL) and is expressed in db (SPL); the horizontal axis represents frequency (f) and is in hertz (Hz). As shown, the curve 31 (solid curve) is lower than the conventional curve 32 (dashed curve), and the broadband noise of the fan is 50.36dB (SPL) which is significantly lower than the conventional curve 51.73dB (SPL), so that the present invention effectively reduces the broadband noise of the fan.

Although the foregoing shows the frame 11 as a single frame, it is not limited thereto. In another alternative embodiment, the frame 11 comprises an upper frame portion and a lower frame portion connected in series to form the frame, or the frame 11 is a separate upper frame portion for being disposed at the air inlet side of another fan frame (such as an axial fan frame) as a device at the air inlet side.

Therefore, by arranging a large number of fine crushing units 1112 in dense arrangement on the air inlet side 111, the invention can improve the suction of a chaotic air flow into the air inlet side 111 and reduce the noise generated by the vortex at the tail end of the plurality of blades 221, thereby effectively achieving the effects of reducing the broadband noise and being simple to manufacture.

Claims

1. A fan frame turbulence structure, comprising:

2. The fan frame turbulence structure of claim 1, wherein: each of the plurality of reducing units has an upper side and a lower side, the upper sides of the plurality of reducing units are aligned or not aligned with each other, and the lower sides of the plurality of reducing units are aligned or not aligned with each other.

3. The fan frame turbulence structure of claim 1, wherein: the plurality of fine crushing units are arranged on the crushing area in a single row or in multiple rows.

4. The fan frame turbulence structure of claim 3, wherein: the plurality of reducing units are integrally formed or not integrally formed on the reducing region.

5. The fan frame turbulence structure of claim 1, wherein: the combination mode of the plurality of fine crushing units is selected to combine in the crushing area by machining, embedding, bonding or sticking nylon buttons.

6. The fan frame turbulence structure of claim 1, wherein: the frame body is a single fan frame.

7. The fan frame turbulence structure of claim 1, wherein: the shape of the plurality of the reducing units is a polygonal cylinder or a hemisphere with equal length or unequal length.

8. The fan frame turbulence structure of claim 1, wherein: the inlet is provided with an air inlet surface, the air inlet surface is positioned between the air inlet side and the inner wall of the channel, the air inlet surface is provided with an air guide surface and a setting surface, the air guide surface and the setting surface are positioned between the inner wall of the channel and the air guide surface, and the fragmentation zone is arranged on the setting surface.