Patent Application
20230323897
This application claims the priority benefit of Taiwan patent application number 111113269 filed on Apr. 7, 2022.
The present invention relates generally to a fan frame, and more particularly to a fan frame turbulence structure.
Along with the promotion of execution efficiency of electronic components, the heat dissipation requirement is abruptly increased.
Therefore, the active heat dissipation device (such as a fan) is applied to the electronic components in cooperation with the passive heat dissipation device. However, in order to lower the high temperature of the electronic components, the rotational speed of the fan is increased so that the noise made in operation of the fan becomes louder and louder. Therefore, it is critical how to lower the noise made by the active heat dissipation device. The active heat dissipation device such as an axial-flow fan includes a fan frame and a fan impeller pivotally disposed in the fan frame. The fan impeller has multiple blades. The fan frame has a wind incoming side and a wind outgoing side respectively positioned on two sides of the fan frame. In operation and working of the axial-flow fan, the higher the rotational speed is, the louder the noise is.
The noise made by the axial-flow fan can be basically classified into wideband noise and narrowband noise. With respect to wideband noise, there are two affection factors. The first factor is the noise caused by the vortexes produced at the tail ends of the blades. The second factor is the noise caused by the great airflow turbulence produced by a mess of airflow sucked in from the wind incoming side. Currently, the main stream in this field has two methods for solving the wideband noise. One is to reduce the gap between the tail ends of the blades of the fan impeller and the opposite inner side of the fan frame. The other is to install a rectifying device (such as a waveguide plate) on the wind incoming side of the fan frame. In the above two methods, the first one of reducing the gap between the tail ends of the blades of the fan impeller and the opposite inner side of the fan frame achieves better effect. However, in practical manufacturing of the fan according to such method, it is necessary strictly control the tolerance of the size of the blades so that the manufacturing precision is higher. This leads to increase of cost. Moreover, after the gap between the tail ends of the blades and the opposite inner side of the fan frame is reduced, the fan impeller is apt to clog due to alien article. As a result, the fan impeller may fail to normally rotate and be burnt down.
It is therefore tried by the applicant to provide a fan frame turbulence structure to solve the above problems existing in the conventional fan.
It is therefore a primary object of the present invention to provide a fan frame turbulence structure, which can break and fracture a mess of airflow sucked in from the wind incoming side of the fan frame into multiple fine gap turbulences to reduce the vortexes produced at the tail ends of the blades so as to effectively lower the noise.
To achieve the above and other objects, the fan frame turbulence structure of the present invention includes a frame body having a wind incoming side and a wind outgoing side, which are respectively disposed on two sides of the frame body. The frame body defines an airflow passage therein. The airflow passage passes through the frame body from the wind incoming side to the wind outgoing side. The airflow passage has a passage inner wall connected with the wind incoming side and the wind outgoing side. The wind incoming side has an inlet in communication with the airflow passage. The inlet has a breaking section positioned between the wind incoming side and the passage inner wall. The breaking section includes multiple densely distributed breaking units. The breaking units define therebetween multiple gaps in communication with the airflow passage.
The breaking units of the breaking section of the present invention serve to break and fracture airflow sucked in from the wind incoming side, whereby part of the airflow passes through the gaps between the breaking units and is broken and fractured into multiple gap turbulences to flow into the air passage. Therefore, the breaking units can break and fracture a mess of airflow sucked in from the wind incoming side so as to achieve lowering effect for the wideband noise. In addition, the fan frame turbulence structure of the present invention is pivotally assembled with a fan impeller to form a fan, whereby the vortexes produced at the tail ends of the fan blades are reduced so as to effectively lower the noise caused by the vortexes.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:
Please refer to
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The breaking section 1111 is disposed on the arrangement surface 1110c and includes multiple densely or sparsely distributed breaking units 1112. The breaking units 1112 are integrally formed or non-integrally formed on the arrangement surface 1110c. In addition, the breaking units 1112 can be selectively side by side densely arranged on the arrangement surface 1110c in single row or side by side densely arranged on the arrangement surface 1110c in multiple rows. Each two adjacent breaking units 1112 define therebetween a gap 1117. The size of the breaking unit 1112 is such as, but not limited to, preferably smaller than or equal to 1 mm. Also, the width of the gap 1117 defined between the breaking units 1112 is such as, but not limited to, smaller than or equal to 1 mm. Accordingly, at least or more than 25 blocks (columns) of breaking units 1112 per unit area of square centimeter are side by side densely arranged on the breaking section 1111 in single row or side by side densely arranged on the breaking section 1111 in multiple rows.
In addition, in this embodiment, the breaking units 1112 of the breaking section 1111 are, but not limited to, in the form of rectangular prism body. By means of mechanical processing (such as cutting), the breaking units 1112 are, but not limited to, side by side densely formed on the arrangement surface 1110c of the wind incoming side 111 at intervals in multiple rows. In a modified embodiment, the breaking units 1112 are selectively in the form of equilateral or non-equilateral polygonal prism body (such as triangular prism body or rectangular prism body), semispherical body, regularly shaped body (such as X-shaped body or substantially E-shaped body) or irregularly shaped body (such as grain body). The breaking units 1112 are connected on the arrangement surface 1110c by means of insertion, adhesion or hook and loop fasteners.
Each of the aforesaid rows includes multiple breaking units 1112 positioned on the same level. The breaking unit 1112 has an upper side 1113 and a lower side 1114, which are flush with the upper side 1113 and the lower side 1114 of an adjacent breaking unit 1112. That is, the upper row of breaking units 1112 are, but not limited to, arranged on the same level, while the lower row of breaking units 1112 are, but not limited to, arranged on the same level. Alternatively, the upper and lower sides 1113, 1114 of the breaking unit 1112 in each row are not flush with the upper and lower sides 1113, 1114 of the adjacent breaking unit 1112. That is, the upper and lower sides 1113, 1114 of the breaking unit 1112 are not positioned on the same level as the upper and lower sides 1113, 1114 of the adjacent breaking unit 1112 and staggered from the upper and lower sides 1113, 1114 of the adjacent breaking unit 1112.
Moreover, two lateral walls 1115 and an outward protruding side 1116 are respectively connected between the upper and lower sides 1113, 1114 of each breaking unit 1112. The outward protruding side 1116 faces the airflow passage 115 and is, but not limited to, axially flush with the passage inner wall 1151 without exceeding the passage inner wall 1151. Alternatively, the length (or height) of the breaking units 1112 in one row is different from the length (or height) of the breaking units 1112 in another row. For example, the length of the breaking units 1112 is gradually increased from the upper row to the lower row or from the lower row to the upper row. In this case, the outward protruding sides 1116 of the breaking units 1112 in the upper and lower rows are not axially flush with each other.
The gap 1117 is defined between the opposite lateral walls 1115 of each two adjacent breaking units 1112 in each row. The gaps 1117 are in communication with the airflow passage 115. In this embodiment, the gaps 1117 are equal to each other (as shown in
Please further refer to
In the above embodiments, the frame body 11 is, but not limited to, a one-piece fan frame. In a modified embodiment, the frame body 11 includes an upper frame section and a lower frame section. The upper and lower frame sections are serially connected with each other to form the frame body. Alternatively, the frame body 11 solely serves as an upper frame section disposed on the wind incoming side of another fan frame (such as axial-flow fan frame) as a device of the wind incoming side.
Accordingly, in the present invention, numerous breaking units 1112 are densely arranged on the wind incoming side 111 to improve the problem that a mess of airflow is sucked into the wind incoming side 111 and lower the noise caused by the vortexes produced at the tail ends of the blades 221. Therefore, the wideband noise is effectively lowered and the manufacturing process is simplified.
The present invention has been described with the above embodiments thereof and it is understood that many changes and modifications in such as the form or layout pattern or practicing step of the above embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 111113269 | Apr 2022 | TW | national |
