TWI698169B - Cooling fan and cooling module including the same - Google Patents

Abstract

The present disclosure provides a cooling fan and a cooling module including the same. The cooling fan includes a base, an axial tube, a bearing, a stator, a rotor, and fan blades. The base includes a base convex structure. Each of the fan blades includes a first concave structure. When the cooling fan is working, the base convex structures go through the first concave structures on each fan blades. The base convex structure and the first concave structure not only increase the heat exchange area of the base but break the thermal boundary layer on the base repeatedly to improve the heat dissipating effect when the cooling fan is working.

Description

Cooling fan and cooling module containing the same

The invention relates to a cooling fan and a cooling module including the cooling fan.

With the advancement of science and technology, many electronic products have been developed. During the operation of these electronic products, a large amount of heat is generated or accumulated. Failure to dissipate heat in time may affect the normal operation of electronic products, reduce their life span and even cause damage. Therefore, in order to maintain the normal operation of electronic products, heat dissipation components need to be installed. Common heat dissipation elements such as heat pipes, heat sinks and fans.

The general heat dissipation mode is to transfer heat to the upper cover or base of the fan through a heat pipe, and then use the fan for heat dissipation. However, when the heat source or heat pipe is overlapped with the upper cover or base of the fan, this heat dissipation method is limited by the surface area there, and the heat exchange effect is not obvious. Therefore, how to improve the heat dissipation effect of the heat dissipation fan is one of the problems to be solved at present.

The invention provides a heat dissipation fan and a heat dissipation module containing the same. The heat dissipation fan increases the heat exchange area through the raised structure on the substrate, so as to improve the heat dissipation effect of the heat dissipation fan.

The embodiment of the present invention provides a heat dissipation fan, which includes a base plate, a shaft tube, a bearing, a stator, a rotor, and a plurality of fan blades. The substrate has a substrate protrusion structure. The shaft tube is fixed to the base plate, and the convex structure of the substrate surrounds the shaft tube. The bearing is located in the shaft tube. The stator is fixed to the base plate. The rotor is pivoted on the bearing. A plurality of fan blades are connected to the rotor, and each of the fan blades has a first recessed structure. When the rotor rotates, the raised structure of the substrate passes through the first recessed structure of each fan blade.

The present invention provides a heat dissipation module including the heat dissipation fan and heat pipe as described above. The heat pipe is in contact with the base plate of the cooling fan.

In the heat dissipation fan of the embodiment of the present invention, through the raised structure of the base plate and the recessed structure of the fan blade, in addition to increasing the heat exchange area of the base plate, the turbulent air flow generated when the fan blade rotates can also repeatedly destroy the thermal boundary on the surface of the base plate Layer to improve the heat dissipation effect.

The detailed features and advantages of the present invention are described in detail in the following embodiments. The content is sufficient to enable anyone familiar with the relevant art to understand the technical content of the present invention and implement it accordingly, and in accordance with the content disclosed in this specification, the scope of patent application and the drawings Anyone who is familiar with related art can easily understand the purpose and advantages of the present invention. The following examples further illustrate the viewpoint of the present invention in detail, but do not limit the scope of the present invention by any viewpoint.

First, the heat dissipation fan 100 of the first embodiment of the present invention will be described. Please refer to FIGS. 1 and 2. FIG. 1 is an exploded view of the heat dissipation fan according to the first embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the heat dissipation fan according to the first embodiment of the present invention. The heat dissipation fan 100 includes a base plate 110, a shaft tube 120, a bearing 130, a stator 140, a rotor 150, a plurality of fan blades 160, a top plate 170 and a side wall 180, and the heat dissipation fan 100 has an air inlet IN and an air outlet OUT.

The substrate 110 has a bearing surface 111 and a substrate protrusion structure 112. The substrate protrusion structure 112 is located on the carrying surface 111. The shaft tube 120 is fixed on the carrying surface 111, and the substrate protrusion structure 112 surrounds the shaft tube 120. The substrate protrusion structure 112 has a substrate channel 113. The shaft tube 120 is exposed in the substrate channel 113. In this embodiment, the number of substrate channels 113 is four, but it is not limited thereto. The material of the substrate 110 can be made of a material with good heat dissipation, such as metal. When the bearing surface 111 of the substrate 110 serves as a heat exchange surface, the substrate protrusion structure 112 can increase the heat exchange area to improve the heat exchange efficiency.

The bearing 130 is located in the shaft tube 120. The stator 140 is fixed to the bearing surface 111 of the base plate 110 through the shaft tube 120 and surrounds the shaft tube 120. The rotor 150 is pivoted to the bearing 130. A plurality of fan blades 160 are connected to the rotor 150. The stator 140 and the rotor 150 are used to drive the fan blade 160 to rotate. In other embodiments, the stator can be directly fixed to the bearing surface of the substrate.

The fan blade 160 has a first recessed structure 161. The first recessed structure 161 is located on the side of the fan blade 160 facing the substrate 110. When the rotor 150 rotates, the substrate convex structure 112 will pass through the first concave structure 161 of each fan blade 160. In the same way, the portion between the first recessed structures 161 of the fan blade 160 can pass through the spaces between the raised structures 112 on the substrate. The substrate protrusion structure 112 has a first width L1, the first recess structure 161 has a second width L2, and the first width L1 is smaller than the second width L2. Therefore, when the fan blade 160 rotates, the substrate protrusion structure 112 can smoothly pass through the first recess structure 161 without interfering with the first recess structure 161. In this embodiment, the shapes of the substrate protrusion structure 112 and the first recess structure 161 are rectangular, but not limited to this. In other embodiments, the convex structure of the substrate and the first concave structure may be rectangular, triangular or arc-shaped, as long as the convex structure of the substrate can smoothly pass through the first concave structure, the two may have different shapes. With the first recessed structure 161 of the fan blade 160 and the substrate protruding structure 112 of the substrate 110, disturbing air flow, such as vortex or turbulence, can be generated when the fan blade rotates to destroy the thermal boundary layer formed on the substrate 110, thereby Improve heat conduction and improve heat dissipation efficiency. In addition, the substrate channel 113 of the substrate protrusion structure 112 serves as an outlet, which allows the higher temperature air flow accumulated between the substrate protrusion structures 112 to be discharged through the substrate channel 113.

The top plate 170 is opposite to the base plate 110, and the side wall 180 is located between the top plate 170 and the base plate 110 and connected to the top plate 170 and the base plate 110. The top plate 170, the side walls 180, and the base plate 110 form a housing, and the stator 140, the rotor 150, and the fan blade 160 are located in the housing. The air inlet IN is located on the top plate 170 for introducing airflow from the outside. In other embodiments, the air inlet IN may be located on the substrate. In another embodiment, the air inlet IN may be located on the top plate and the base plate at the same time. The air outlet OUT is located on the side wall 180 for discharging the air flow with heat. The substrate channel 113 of the at least one substrate protrusion structure 112 is located between the shaft tube 120 and the air outlet OUT, that is, close to the air outlet OUT. This configuration can help the fan blade 160 dissipate the heat accumulated in the substrate protrusion structure 112 to the outside of the heat dissipation fan 100 as soon as possible. In this embodiment, the stator 140, the rotor 150, and the fan blade 160 are located between the top plate 170, the side wall 180 and the base plate 110, but not limited to this. In other embodiments, the air outlet and the air inlet may be respectively located on the top plate and the base plate, such as an axial fan.

Next, the heat dissipation module 1 including the heat dissipation fan 100 of the first embodiment of the present invention will be described. Please refer to FIG. 3, which is a perspective view of a heat dissipation module including the heat dissipation fan according to the first embodiment of the present invention. The heat dissipation module 1 includes the heat dissipation fan 100 and the heat pipe P of the aforementioned first embodiment. The heat pipe P contacts the substrate 110 and conducts heat to the heat dissipation fan 100 for heat dissipation. The heat dissipation module 1 can be used for any electronic products that require a heat sink, such as notebook computers and desktop computers. In this embodiment, the heat dissipation module 1 uses the heat dissipation fan 100 of the first embodiment for heat dissipation, but it is not limited to this. The heat dissipation module can also use heat dissipation fans in other embodiments of the present invention to dissipate heat.

Next, the heat transfer path of the heat dissipation module 1 using the heat dissipation fan 100 of the first embodiment of the present invention will be described. The heat pipe P is in contact with a heat source or other heat-conducting parts, and transfers heat to the substrate 110. The base plate 110, the top plate 170, and the side wall 180 may be made of materials with good thermal conductivity, so the connected base plate 110, the top plate 170, and the side wall 180 can transfer heat and at the same time serve as a heat exchange member for heat exchange. The substrate protrusion structure 112 can increase the heat exchange area of the substrate 110. When the cooling fan 100 is running, the airflow is introduced from the air inlet IN, and after the heat exchange is performed through the substrate 110, the airflow carrying the heat is discharged from the air outlet OUT. In addition, when the heat dissipation fan 100 is running, the substrate protrusion structure 112 passes through the first recess structure 161. In the same way, the portion between the first recessed structures 161 of the fan blade 160 passes through the spaces between the raised structures 112 on the substrate. Thereby, the turbulent airflow generated by the rotating fan blade 160 repeatedly destroys the thermal boundary layer formed on the surface of the substrate 110 to improve the heat dissipation effect.

Next, the heat dissipation fan 200 of the second embodiment of the present invention will be described. Please refer to FIG. 4, which is an exploded view of a heat dissipation fan according to a second embodiment of the present invention. The heat dissipation fan 200 includes a base plate 110, a shaft tube 120, a bearing 130, a stator 140, a rotor 150, a plurality of fan blades 160, a top plate 170, a side wall 180, an air inlet IN and an air outlet OUT. The second embodiment is substantially the same as the first embodiment, and only the differences are described below. Please refer to the above description for the same parts, and will not repeat them here.

In the first embodiment, the substrate protrusion structure 112 has four substrate channels 113, but it is not limited thereto. In the heat dissipation fan 200 of the second embodiment, the substrate protrusion structure 112 does not have the substrate passage 113. In other words, the substrate protrusion structure 112 is a continuous and uninterrupted structure. The heat dissipation fan 200 without the substrate channel 113 can also use the first recessed structure 161 of the fan blade 160 and the substrate protruding structure 112 of the substrate 110 to generate turbulent airflow, such as vortex or turbulence, when the fan blade rotates. The thermal boundary layer on the substrate 110 enhances heat conduction and improves heat dissipation efficiency.

In the first embodiment, a substrate protrusion structure 112 passes through a first recess structure 161 on each fan blade 160, but it is not limited to this. Please refer to FIG. 5, which is a schematic cross-sectional view of a fan blade portion of a heat dissipation fan according to a third embodiment of the present invention. The third embodiment is substantially the same as the first embodiment, and only the differences are described below. Please refer to the above description for the same parts, and will not repeat them here. In the heat dissipation fan 300 of the third embodiment, the fan blade 160 further has a notch 162. The notch 162 and the first recessed structure 161 are disposed on the same side of the fan blade 160. When the rotor 150 rotates, the substrate convex structure 112 passes through the first concave structure 161 but does not pass through the gap 162. The gap 162 can be any number and any position without affecting the function and structural strength of the fan blade. The notch 162 can further generate turbulent airflow, such as vortex or turbulence, when the fan blade 160 rotates to help destroy the thermal boundary layer on the surface of the substrate 110.

In the first embodiment, a substrate protrusion structure 112 passes through a first recess structure 161 on each fan blade 160, but it is not limited to this. Please refer to FIG. 6, which is a schematic cross-sectional view of a fan blade portion of a heat dissipation fan according to a fourth embodiment of the present invention. The fourth embodiment is substantially the same as the first embodiment, and only the differences are described below. Please refer to the above description for the same parts, and will not repeat them here. In the heat dissipation fan 400 of the fourth embodiment, when the rotor 150 rotates, a plurality of substrate protrusion structures 112 simultaneously pass through a first recess structure 161 on each fan blade 160, that is to say, a first recess structure 161 can be A plurality of substrate protrusion structures 112 are accommodated. The plurality of substrate protrusion structures 112 can further generate disturbing airflow, such as vortex or turbulence, when the fan blade 160 rotates, to help destroy the thermal boundary layer on the surface of the substrate 110.

Next, the heat dissipation fan 500 of the fifth embodiment of the present invention will be described. Please refer to FIGS. 7 and 8. FIG. 7 is an exploded view of a heat dissipation fan according to a fifth embodiment of the present invention, and FIG. 8 is a schematic cross-sectional view of a blade portion of a heat dissipation fan according to a fifth embodiment of the present invention. The heat dissipation fan 500 includes a base plate 110, a shaft tube 120, a bearing 130, a stator 140, a rotor 150, a plurality of fan blades 160, a top plate 170, a side wall 180, an air inlet IN and an air outlet OUT. The fifth embodiment is substantially the same as the first embodiment, and only the differences are described below. Please refer to the above description for the same parts, and will not repeat them here.

In the fifth embodiment, the top plate 170 has a top plate convex structure 171, and the top plate convex structure 171 surrounds the air inlet IN. The top plate protrusion structure 171 has a top plate channel 172. In this embodiment, the number of top plate channels 172 is four, but it is not limited thereto. In other embodiments of the present invention, the ceiling channel may not be provided. The top plate protrusion structure 171 can increase the heat exchange area, thereby enhancing heat conduction and improving heat dissipation efficiency.

The fan blade 160 has a first recessed structure 161 and a second recessed structure 163. The first recessed structure 161 and the second recessed structure 163 are located on opposite sides of the fan blade 160 and aligned with each other. When the rotor 150 rotates, the base plate protrusion structure 112 will pass through the first recess structure 161 of each fan blade 160, and the top plate protrusion structure 171 will pass through the second recess structure 163 of each fan blade 160. In the same way, the part between the first recessed structure 161 of the fan blade 160 can pass through the space between the base plate raised structures 112, and the part between the second recessed structure 163 can pass through the space between the top plate raised structures 171 . With the first recessed structure 161, the second recessed structure 163, the base plate raised structure 112, and the top plate raised structure 171, when the fan blade rotates, disturbing airflow, such as vortex or turbulence, can be generated to damage the base plate 110 and the top plate 170. The thermal boundary layer to enhance heat conduction and improve heat dissipation efficiency. In addition, the substrate channel 113 and the top plate channel 172 are used as outlets to allow the higher-temperature air flow accumulated between the substrate protrusion structure 112 and the top plate protrusion structure 171 to be discharged through the substrate channel 113 and the top plate channel 172.

In the fifth embodiment, the first recessed structure 161 and the second recessed structure 163 are located on opposite sides of the fan blade 160 and are aligned with each other, but not limited to this. Please refer to FIG. 9, which is a cross-sectional view of the fan blade portion of the heat dissipation fan according to the sixth embodiment of the present invention. The sixth embodiment is substantially the same as the fifth embodiment, and only the differences are described below. Please refer to the above description for the same parts, and will not repeat them here. In the heat dissipation fan 600 of the sixth embodiment, the first recessed structure 161 and the second recessed structure 163 are located on opposite sides of the fan blade 160, and are out of phase. The position of the second concave structure 163 can be matched with the top plate protrusion structure 171 of the top plate 170, so that the top plate 170 is more flexible in structural design. In other embodiments, the first recessed structure 161 and the second recessed structure 163 may have any number and positional relationship without affecting the function of the fan blade.

In the heat dissipation fan of the embodiment of the present invention, through the raised structure of the base plate and the recessed structure of the fan blade, in addition to increasing the heat exchange area of the base plate, the turbulent air flow generated when the fan blade rotates can also repeatedly destroy the thermal boundary on the surface of the base plate Layer to improve the heat dissipation effect.

Although the present invention is disclosed in the foregoing embodiments, it is not intended to limit the present invention. All changes and modifications made without departing from the spirit and scope of the present invention fall within the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the attached patent scope.

1: Cooling module

100, 200, 300, 400, 500, 600: cooling fan

110: substrate

111: bearing surface

112: substrate raised structure

113: substrate channel

120: shaft tube

130: bearing

140: stator

150: Rotor

160: fan blade

161: The first recessed structure

162: Gap

163: second recessed structure

170: top plate

171: Top plate raised structure

172: roof channel

180: side wall

200: cooling module

P: Heat pipe

IN: Air inlet

OUT: Outlet

L1: first width

L2: second width

Fig. 1 is an exploded view of the cooling fan according to the first embodiment of the present invention. 2 is a schematic cross-sectional view of the heat dissipation fan according to the first embodiment of the present invention. 3 is a perspective view of a heat dissipation module including the heat dissipation fan of the first embodiment of the present invention. Fig. 4 is an exploded view of the cooling fan according to the second embodiment of the present invention. 5 is a schematic cross-sectional view of the fan blade portion of the heat dissipation fan according to the third embodiment of the present invention. 6 is a schematic cross-sectional view of the fan blade portion of the cooling fan according to the fourth embodiment of the present invention. Fig. 7 is an exploded view of a heat dissipation fan according to a fifth embodiment of the present invention. FIG. 8 is a schematic cross-sectional view of a fan blade portion of a heat dissipation fan according to a fifth embodiment of the present invention. Fig. 9 is a cross-sectional view of a fan blade portion of a heat dissipation fan according to a sixth embodiment of the present invention.

100: cooling fan

110: substrate

111: bearing surface

112: substrate raised structure

113: substrate channel

120: shaft tube

130: bearing

140: stator

150: Rotor

160: fan blade

161: The first recessed structure

170: top plate

180: side wall

IN: Air inlet

OUT: Outlet

Claims (9)

A heat dissipation fan includes: a base plate with a base plate protrusion structure; a shaft tube fixed to the base plate, the base plate protrusion structure surrounding the shaft tube; a bearing located in the shaft tube; a stator fixed to the base plate A rotor pivoted on the bearing; a plurality of fan blades connected to the rotor, each of the fan blades has a first concave structure, when the rotor rotates, the base plate convex structure passes through each of the fan blades The first recessed structure; a top plate, opposite to the base plate; a side wall, located between the top plate and the base plate and connected with the top plate and the base plate, the top plate, the side wall and the base plate forming a housing, the stator , The rotor and the fan blades are located in the housing; and an air inlet and an air outlet, when the air inlet is located on the top plate, the air outlet is located on the base plate or the side wall; when the air inlet is located on the base plate , The air outlet is located on the top plate or the side wall. The heat dissipation fan according to claim 1, wherein the raised structure of the substrate has a first width, and the first recessed structure has a second width, and the first width is smaller than the second width. The heat dissipation fan according to claim 1, wherein the shape of the convex structure of the substrate or the first concave structure is a rectangle, a triangle, or an arc. The heat dissipation fan according to claim 1, wherein the fan blades further have a notch, and the notch and the first recessed structure are disposed on the same side of the fan blades. The heat dissipation fan according to claim 1, wherein the number of the convex structure of the substrate is multiple, and the convex structures of the substrate pass through the first concave structure of each of the fan blades at the same time. The heat dissipation fan according to claim 1, wherein the substrate protrusion structure has a substrate passage, and the substrate passage is located between the shaft tube and the air outlet. The heat dissipation fan according to claim 1, wherein the top plate has a top plate convex structure, the top plate convex structure has a top plate channel, the fan blades have a second concave structure, and when the rotor rotates, the top plate convex The lift structure passes through the second recessed structure, and the first recessed structure and the second recessed structure are located on opposite sides of the fan blades. The heat dissipation fan according to claim 7, wherein the first recessed structure and the second recessed structure are misaligned. A heat dissipation module includes the heat dissipation fan described in any one of claims 1-8 and a heat pipe, and the heat pipe is in contact with the substrate.

Images