TWI468596B - Centrifugal fan - Google Patents

Description

Centrifugal fan

The invention relates to a centrifugal fan, in particular to a centrifugal fan for dissipating heat from electronic components.

At present, with the rapid development of the computer industry, heat generated by heat-generating electronic components such as micro-processed wafers is increasing. In order to effectively dissipate the excess heat, a conventional method is to attach a heat absorbing block to the surface of the heat-generating electronic component, and provide a heat pipe and a heat-dissipating fin set, respectively, and the heat-dissipating block and the heat-dissipating block respectively. The fin sets are connected, and then a centrifugal fan is disposed in the vicinity of the heat dissipating fin group, and the cooling fins generated by the centrifugal fan are used to forcibly dissipate the heat dissipating fin group, thereby dissipating heat generated by the heat generating electronic components.

A conventional centrifugal fan generally includes a frame and an impeller disposed in the frame. The bottom of the frame is provided with an air inlet, and a bracket for supporting the rotation of the impeller is disposed in the air inlet. Conventional centrifugal fans usually have screw holes corresponding to each other on the bracket and the fan frame, and the screws pass through the screw holes to fix the brackets to the frame. When the fan is working, the high speed rotation of the impeller on the bracket forces the fan to rotate. The bracket is swayed relative to the fan frame, and because the thickness of the fan frame is thin, continuous swaying may easily cause the thread of the screw hole in the screw hole of the fan frame to collapse, so that the bracket cannot be firmly fixed on the fan frame. Support the smooth rotation of the impeller.

In view of the above, it is necessary to provide a centrifugal fan that can firmly fix the bracket to the fan frame to smoothly support the rotation of the impeller.

A centrifugal fan includes a frame and an impeller disposed in the fan frame. The fan frame includes a bottom plate. The bottom plate is provided with an air inlet. The air inlet is provided with a bracket, and the impeller is mounted on the bracket. a plurality of protrusions are formed on the bottom surface of the bottom plate to extend downwardly around the air inlet. The middle portion of the protrusion is provided with a threaded hole, and the bracket is provided with a plurality of through holes corresponding to the protrusions. The through holes are respectively disposed on the protrusions of the bottom plate, and the plurality of screws are respectively screwed with the threaded holes of the protrusions to fix the brackets on the bottom surface of the bottom plate.

Compared with the prior art, the protrusion of the centrifugal fan can be assembled on the bottom plate to realize the positioning of the bracket, and the thickness of the threaded hole on the base is increased, thereby preventing the thinner base in the prior art. And the thread of the threaded hole collapses.

10‧‧‧ Centrifugal fan

12‧‧‧Fan frame

14‧‧‧ Impeller

16‧‧‧Base

17‧‧‧ screws

18‧‧‧ bracket

19‧‧‧ Cover

140‧‧·wheels

141‧‧‧ top wall

142‧‧‧ leaves

143‧‧‧ side wall

144‧‧‧ mandrel

160‧‧‧floor

162‧‧‧ side wall

163‧‧‧ steps

164‧‧‧ inlet

165‧‧‧Threaded holes

166‧‧‧air outlet

167‧‧‧Bump

180‧‧‧Fixed Department

181‧‧‧Steps

182‧‧‧Support board

183‧‧‧through hole

185‧‧‧ 耳耳

186‧‧‧ Ribs

187‧‧‧ tube body

188‧‧‧ bearing

190‧‧‧ inlet

1 is a perspective assembled view of an embodiment of a centrifugal fan of the present invention.

Fig. 2 is an exploded perspective view of Fig. 1;

Figure 3 is an exploded perspective view of Figure 2 when inverted.

4 is a perspective view of another embodiment of the bracket of FIG. 2.

The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

As shown in FIG. 1 , the centrifugal fan 10 includes a frame 12 and an impeller 14 disposed in the frame 12 .

Please refer to FIG. 2 and FIG. 3 simultaneously. The frame 12 includes a base 16 and is disposed at the bottom of the base 16 . A bracket 18 at the end and a cover 19 covering the base 16.

The base 16 includes a bottom plate 160 and a side wall 162 extending upward from a periphery of the bottom plate 160. The bottom portion of the bottom plate 160 is provided with a circular air inlet 164 corresponding to the position of the impeller 14. The bottom surface of the bottom plate 160 is recessed toward the top surface of the air inlet 164 to form a circular step 163. The step 163 is provided with three cylindrical studs 167 at equal intervals, and the studs 167 are formed by vertically extending downward from the surface of the step 163. A central portion of each of the studs 167 is provided with a threaded hole 165 extending upwardly from the bottom end of the stud 167 to extend through the step 163. The side wall 162 has a spiral shape, and one side of the air outlet 164 is provided with an air outlet 166 perpendicular to the air inlet 164.

The bracket 18 is substantially disk-shaped and is disposed in the air inlet 164 of the base 16 and has an outer edge abutting against the step 163 of the base 16 . The bracket 18 includes a circular fixing portion 180 , a supporting plate 182 disposed in the fixing portion 180 , and three ribs 186 connected between the fixing portion 180 and the supporting plate 182 . The fixing portion 180 is in the form of a circular flat plate. The outer peripheral edge of the top surface of the fixing portion 180 is recessed downward to form a circular step portion 181. The size of the step portion 181 is equivalent to the size of the step 163. When the bracket 18 is assembled in the air inlet 164 of the base 16, the step portion 181 just abuts against the step 163 of the base 16, and the bottom surface of the bracket 18 is in the same plane as the bottom surface of the bottom plate 160 of the base 16. on. The outer periphery of the step portion 181 extends outward to form three lugs 185 respectively corresponding to the studs 167 of the base 16. Each of the lugs 185 is substantially semi-circular, and a center of each of the lugs 185 is correspondingly provided with a through hole 183. The diameter of the through hole 183 is equal to the outer diameter of the protrusion 167 to abut the step portion 181. When the pedestal 163 is placed on the step 163 of the base 16, the protrusion 167 can be correspondingly inserted into the through hole 183 of the step portion 181, so that the bracket 18 is pre-assembled on the base 16. The support plate 182 is substantially in the shape of a circular plate and is disposed at the middle of the annular fixing portion 180. . A central portion of the top surface of the support plate 182 extends vertically upward to form a tubular body 187. The tubular body 187 houses a bearing 188 therein. The ribs 186 are equally spaced and connect the outer edge of the support plate 182 to the inner edge of the fixed portion 180.

In a specific implementation, the number of the protrusions 167 on the base 16 is not limited by the embodiment, and may be two or more, and the number of the ribs 186 on the bracket 18 is also changed correspondingly. Referring to FIG. 4 , the bracket 18 can also include only the support plate 182 and the rib 186 extending from the outer edge of the support plate 182 . The through hole 183 is disposed at the end of the rib 186 .

The impeller 14 includes a hub 140 and a plurality of blades 142 disposed on the hub 140. The hub 140 includes a top wall 141 and an annular sidewall 143 extending downward from a periphery of the top wall 141. The hub 140 is The center of the top wall 141 extends in the direction of the support plate 182 to form a mandrel 144 which is mounted in the bearing 188 by the mandrel 144 so as to be rotatably mounted on the support plate 182 and received in the base 16.

The shape of the cover plate 19 is similar to the shape of the bottom plate 160, and a circular air inlet 190 is defined in the middle of the cover plate 19.

During assembly, the through holes 183 of the bracket 18 are respectively sleeved on the protrusions 167 of the bottom plate 160, and the step portion 181 of the bracket 18 is abutted against the step 163 of the bottom plate 160, thereby the bracket 18 is assembled. The bottom plate 160 is positioned on the bottom plate 160 and screwed to the threaded hole 165 of the protruding post 167 by screws 17 to fix the bracket 18 to the bottom surface of the bottom plate 160. The mandrel 144 in the hub 140 is fitted into the bearing 188 in the tubular body 187 to assemble the impeller 14 to the base 16, and the cover 19 is correspondingly disposed at the top end of the side wall 162. The centrifugal fan 10 increases the thickness of the threaded hole 165 on the base 16 through the arrangement of the boss 167 on the base 16, thereby preventing the screw of the threaded hole 165 from collapsing due to the thinness of the base 16 in the prior art. The protrusion 167 is disposed on the outer side of the base 16 and is not caused by The airflow in the fan frame 12 is hindered to generate noise.

In summary, the present invention conforms to the requirements of the invention patent, and proposes a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

14‧‧‧ Impeller

17‧‧‧ screws

18‧‧‧ bracket

19‧‧‧ Cover

140‧‧·wheels

141‧‧‧ top wall

143‧‧‧ side wall

144‧‧‧ mandrel

163‧‧‧ steps

164‧‧‧ inlet

165‧‧‧Threaded holes

166‧‧‧air outlet

167‧‧‧Bump

Claims (5)

A centrifugal fan includes a frame and an impeller disposed in the fan frame. The fan frame includes a bottom plate. The bottom plate is provided with an air inlet. The air inlet is provided with a bracket, and the impeller is mounted on the bracket. The improvement is that a bottom surface of the bottom plate extends downwardly around the air inlet to form a plurality of protrusions, and a central portion of the protrusion is provided with a threaded hole, and the bracket is provided with a plurality of corresponding to the protrusion a hole having an aperture corresponding to an outer diameter of the protrusion, wherein the through hole of the bracket is respectively disposed on the protrusion of the bottom plate, and the plurality of screws respectively screw with the threaded hole of the protrusion to The bracket is fixed to the bottom surface of the bottom plate. The centrifugal fan of claim 1, wherein the bottom surface of the bottom plate is recessed toward the top surface of the air inlet to form a circular step, and the protrusion is disposed on the step. The centrifugal fan of claim 1, wherein the bracket comprises a support plate and a plurality of ribs extending from an outer edge of the support plate, the through holes being provided at the ends of the ribs. The centrifugal fan of claim 1, wherein the bracket comprises an annular fixing portion, a supporting plate disposed in the fixing portion, and a connecting edge between the outer edge of the supporting plate and the inner edge of the fixing portion. a plurality of ribs, the through holes being provided on the fixing portion. The centrifugal fan of claim 4, wherein a bottom surface of the bottom plate is recessed toward a top surface thereof at a peripheral position of the air inlet to form a circular step, and a top surface of the fixing portion of the bracket is downwardly The recess forms a circular step, and the step of the bracket abuts against the step of the bottom plate.