JP3122778U - Blade structure of heat dissipation fan for cooling semiconductor devices - Google Patents

Abstract

A blade structure for improving exhaust air pressure and air volume of a heat dissipation fan for cooling a semiconductor device.
A blade structure of a heat dissipation fan includes a hub, a plurality of connecting ribs, and a blade set. The hub 3 has an outer peripheral wall 31, and one ends of the plurality of connecting ribs 4 are coupled and supported by the outer peripheral wall. The blade set 5 is coupled and supported to the other end of the rib 4 via an airflow guide ring 53 and further coupled to the outer ring 51 at the bottom.
The vane set includes upper and lower vanes 52 and a second vane 54 extending above the airflow guide ring, and increases the working area and allows the airflow to smoothly flow through the inclined surface 531 and the external ring of the airflow guide ring. , Improve wind pressure.
[Selection] Figure 6

Description

The present invention relates to a blade structure, and more particularly to a blade structure of a heat dissipation fan for cooling a semiconductor device.

Due to advances in science and technology, the current operation speed of semiconductor elements such as CPUs and chips is increasing day by day, and a large amount of heat is generated as a result of high-speed calculations. However, electron flow on the semiconductor element is accelerated by high heat, and not only the stability of the semiconductor element is lowered but also the life of the semiconductor element is affected.

For this reason, in general, in order to ensure stability of a semiconductor element with high heat generation, a heat radiating device is installed to remove heat generated from the semiconductor element. The heat dissipating device is classified into an air cooling type and a water cooling type depending on the medium used. In general, an air-cooled heat radiating device is used as a heat radiating device to be contacted, and a heat radiating fan is used.

A heat radiating fan performs heat radiating and cooling by circulating an air flow in which heat generated from a heat generating element is accelerated, and is often used in a personal computer. Based on the design of various heat dissipation elements, in order to apply the heat dissipation fan to the environmental conditions of various heat dissipation elements, a heat dissipation fan of the type that intakes from the axial direction and exhausts from the side surface has been developed.

FIG. 1 is a perspective view showing a DC brushless axial flow fan that sucks air in the axial direction and exhausts air from the side according to the prior art. The above-described axial fan 1 includes a base stand 11, an impeller 12 disposed on the base stand 11, and a casing 13 that is coupled to the base stand 11 and covers the impeller 12. The casing 13 is formed with an air inlet 131 above the impeller 12 and an air outlet 132 on the side of the base 11.

As shown in FIGS. 1, 2, and 3, the impeller 12 includes a hub 121, a plurality of connection ribs 122 connected to the hub 121, a plurality of blades 123 connected to the plurality of connection ribs 122, and a plurality of blades. And an outer ring 124 connected to 123. When the axial fan 1 is operated and the impeller 12 is rotated, as shown by an arrow in FIG. 3, an air flow is sucked from the intake port 131 on the upper surface of the casing 13, that is, air is sucked from above the casing 121, and The air is exhausted from the blower opening 132 of the casing 13 via the blades 123, and the axial fan 1 achieves the purpose of intake from the axial direction and exhaust from the side.

However, when the above-described axial fan 1 is operated, the airflow sucked by the intake port 131 on the upper surface of the casing 13 flows directly in the axial direction and collides with the surface of the base table 11, and the airflow is perpendicular to the surface of the base table 11. After being collided, it is bent and discharged from the air blowing port 132. Therefore, there are the following drawbacks in use.

1 During operation of the axial fan 1 which is inferior in heat dissipation effect, the direction of airflow is the axial direction, and after colliding with the surface of the base 11, the direction is suddenly curved from the axial direction to the radial direction, so that it is sucked The air flow receives pressure and generates not only an extremely unstable air flow, but also a stable and smooth exhaust cannot be performed, the exhaust amount and the wind pressure are reduced, and the heat dissipation effect cannot be enhanced.
2 Not only the exhaust amount is not smooth, but also the outer ring 124 of the impeller 12 is provided on the outer edge of the plurality of blades 123 in a ring shape, and the airflow collides perpendicularly with the surface of the base 11. However, when it is curved and exhausted from between the plurality of blades 123, the installation position of the outer ring 124 obstructs the exhaust angle of the airflow and affects the exhaust efficiency.

The emphasis of the present invention is to improve the exhaust amount of the axial fan 1 according to the above-described prior art and enhance the heat dissipation effect.
Japanese Patent Laid-Open No. 08-288440 Japanese Patent Laid-Open No. 06-132434

An object of the present invention is to provide a blade structure of a heat dissipating fan that can increase the air flow rate and perform smooth exhaust.

In order to solve the above-described object, the present invention is a blade structure of a heat dissipation fan, the heat dissipation fan includes a casing that forms a storage space, and an upper surface of the casing is formed with an intake port that communicates with the storage space. A blower opening communicating with the accommodation space is formed on one side of the casing, the blade structure is installed in the casing, and further includes a hub, a plurality of connection ribs, and a blade set.

The hub has an annular outer peripheral wall and faces the intake port. The plurality of connection ribs are installed on the hub at intervals, and one end of each connection rib is connected to the outer peripheral wall. The blade set is connected to the other ends of the plurality of connection ribs, and is provided with an outer ring installed around the bottom edge of the outer peripheral wall of the hub, and a plurality of first blades extending upward with a space from the upper surface of the outer ring, An airflow guide ring connected to the inner edges of the plurality of first blades; and a plurality of second blades extending upward from the upper surface of the airflow guide ring and formed at the inner edges of the plurality of first blades. The other end of the plurality of connecting ribs is connected to the airflow guide ring, and an inclined surface that is inclined downward from the hub toward the outer ring is formed on the upper surface of the airflow guide ring.

  When the blade structure of the heat dissipating fan starts operation, the air flow is sucked from the intake port, and the first blade and the second blade are connected to each other. Increase the exhaust amount and wind pressure, guide the air flow between each of the plurality of first blades and the second blades by the inclined surface of the air flow guide ring, and exhaust the air from the air blowing port, so that the air flow is less disturbed. Good heat dissipation effect can be achieved.

The blade structure of the heat dissipating fan according to the present invention can increase the displacement and the wind pressure by increasing the working area in the gas flow field. Moreover, the inclined airflow guide ring allows the sucked axial airflow to be smoothly guided to the air outlet and exhausted, and the airflow is not reduced because the flow is not hindered and the airflow is reduced. In the process of flowing the blade structure of the heat radiating fan, it can flow smoothly and stably, and the object of the present invention can be achieved reliably.

Embodiments showing the objects, features, and effects of the present invention will be described in detail with reference to the drawings. In the following description, similar members are denoted by the same reference numerals.

As shown in FIGS. 4 and 5, the embodiment of the blade structure of the present invention is installed in the casing 2 of the heat radiating fan, and the casing 2 is formed on the peripheral wall 21 forming the storage space 210 and on the upper surface of the peripheral wall 21. The air inlet 22 that communicates with the space 210 and the air vent 23 that is formed on one side of the casing 2 and communicates with the housing space 210 are provided. The blade structure of the heat radiating fan includes a hub 3, a plurality of connection ribs 4, and a blade set 5.

As shown in FIGS. 6 and 7, the hub 3 includes an annular outer peripheral wall 31, and a plurality of connecting ribs 4 are annularly arranged around the hub 3, and one end of each connecting rib 4 is coupled to the outer peripheral wall 31. Is done. In the present embodiment, the upper surface and the side surface of each connection rib 4 have an arc shape.

The blade set 5 includes an outer ring 51 installed around the bottom edge of the outer peripheral wall 31 of the hub 3,
A plurality of first blades 52 that are coupled to the outer ring 51 and are erected upward from the upper surface thereof, and are coupled to and supported by the other ends of the plurality of connection ribs 4, and inside the plurality of first blades 52. An airflow guide ring 53 coupled to and supporting the edge, and a second blade 54 formed on the inner edge of the first blade 52 extending upward from the upper surface of the airflow guide ring 53.
The cross sections of the first blade 52 and the second blade 54 are arcuate, that is, the arcuately curved angle of the second blade 54 continues to the first blade 52 and the upper surface of the airflow guide ring 53. An inclined surface 531 that is inclined downward from the hub 3 toward the outer ring 51 is formed, and the inclined surface 531 guides the airflow downward. Detailed explanation will be given later.

In the embodiment of the present invention, the airflow guide ring 53 is connected to the inner edge of each first blade 52 at a position that is one third of the total length of the inner edge from the upper end, and the plurality of second blades 54 are connected to the airflow. The guide ring 53 extends upward from the inclined surface 531 and is integrated with the plurality of first blades 52.

It should be noted that the vertical length and the horizontal arc length of each second blade 54 are one third of the corresponding first blade 52. However, when actually implemented, the length of each second blade 54 and the length of the arc are the height at which the airflow guide ring 53 and the plurality of first blades 52 are connected, and the cross section of the inclined surface 531. It is determined by the width and may be changed according to the situation, and there is no particular limitation.

When the hub 3 rotates, the blade set 5 connected by the plurality of connection ribs 4 rotates, and the air outside the casing 2 flows from the intake port 22 of the casing 2 to the accommodation space 210 as indicated by arrows in FIGS. At this time, the airflow guided and sucked by the airflow guide ring 53 of the vane set 5 is guided to the radial blower port 23 by the inclination angle of the inclined surface 531 and from the side surface. It is possible to reduce a reduction in the amount of exhaust air due to the exhaust air being directly collided with the bottom of the casing 2 and exerting pressure. In addition, since the upper surfaces and side surfaces of the plurality of connecting ribs 4 are designed to be curved in an arc shape, the resistance when sucking in the axial direction can be reduced, and intake can be performed smoothly.

Further, by combining the plurality of first blades 52 and second blades 54 of the blade set 5, the area of action of the gas flow field in the storage space 210 can be expanded, and the air flow rate in the storage space 210 is greatly improved. In addition, the displacement and wind pressure can be increased.

FIG. 8 is a curve diagram showing the results of the wind pressure experiment of the blade structure of the heat dissipating fan according to the present invention and the impeller of the DC brushless axial fan according to the prior art. In the figure, Q (CFM) on the horizontal axis indicates the air flow rate expressed in cubic meters, and P (mm-H 2 O) on the vertical axis indicates the pressure value of the mm water column, that is, the wind pressure in a unit area. As the experimental results show, the present invention can generate a high wind pressure as a result of comparing the blade structure of the heat dissipating fan according to the present invention and the prior art on the premise that the casings 2 having the same size are used. This indicates that the working area in the gas flow field can be enlarged, and the displacement and wind pressure can be increased.

  FIG. 9 is a perspective view showing a state in which the blade structure of the heat dissipating fan according to the present invention is applied to the casing 2 of another embodiment. The blade structure of the heat dissipating fan according to the present invention can increase the air volume and the air pressure in the same manner during operation, and can increase the heat dissipating effect.

  As can be seen from the above description and FIGS. 6 and 7, in the blade structure of the heat dissipation fan according to the present invention, the plurality of first blades 52 and second blades 54 are combined to increase the entire area of the blade set 5. The working area of the flow field in the accommodation space 210 increases, and the gas flow rate increases. In addition, the outer ring 51 is installed at the bottom of the plurality of first blades 52 and does not interfere with the gas flow, affecting the exhaust angle of the airflow as in the prior art.

  As described above, the blade structure of the heat dissipating fan according to the present invention can improve the air volume and the air pressure by increasing the working area in the gas flow field. In addition, the inclined airflow 531 of the airflow guide ring 53 smoothly guides the exhausted airflow in the axial direction to the air blowing port 23 and exhausts it. In the process of flowing through the blade structure of the heat dissipating fan according to the present invention, it can flow smoothly and stably, and the object of the present invention can be reliably achieved.

  The above description shows an embodiment of the present invention, and does not limit the scope of the present invention. All simple changes and modifications based on the gist of the present invention are included in the present invention.

It is a perspective view which shows the axial fan by a prior art. It is a top view which shows the impeller of the axial fan of FIG. It is sectional drawing of the impeller of FIG. It is a perspective view which shows the Example of the blade | wing structure of the heat radiating fan by this invention. It is a top view which shows the impeller of the thermal radiation fan of FIG. It is sectional drawing of the impeller of FIG. It is a perspective view of the impeller of FIG. It is a curve figure which shows the result of the wind pressure experiment of the impeller of the DC brushless axial flow fan by a conventional technology, and the blade | wing structure of the heat radiating fan by this invention. It is a perspective view which shows the state which installed the blade | wing structure of the thermal radiation fan by this invention in the casing of another form.

Explanation of symbols

2 Casing 21 Peripheral wall 210 Accommodating space 22 Intake port 23 Blower port 3 Hub 31 Outer peripheral wall 4 Connecting rib 5 Blade set 51 External ring 52 First blade 53 Airflow guide ring 531 Inclined surface 54 Second blade

Claims (4)

The casing includes a casing that forms a housing space for the heat dissipating fan blades, and the casing has an air inlet port that communicates with the housing space on the top surface, and a blower port that communicates with the housing space on one side thereof.
The fan blade comprises a hub, a plurality of connecting ribs and a blade set,
The hub includes an annular outer peripheral wall and is disposed to face the intake port.
The plurality of connecting ribs are arranged so as to be coupled and supported at one end of the outer peripheral wall of the hub at intervals.
The blade set is coupled to the other ends of the plurality of connecting ribs, and has an outer ring installed around the bottom edge of the outer peripheral wall of the hub, and a plurality of first rings extending upwardly from the upper surface of the outer ring. A blade, an airflow guide ring coupled to the inner edge of the first blade, and a second blade extending upward from the upper surface of the airflow guide ring and formed at the inner edge of the first blade, The other end of the connection rib is coupled to the airflow guide ring, and an inclined surface that is inclined downward from the hub toward the outer ring is formed on the upper surface of the airflow guide ring.
The blade structure of the heat radiating fan, wherein the air sucked from the air intake port is driven by the first and second blades, is guided by the airflow guide ring inclined surface, and is sent out from the air blowing port. .   2. The blade structure of a heat radiating fan according to claim 1, wherein cross sections of the first blade and the second blade have an arc shape.   3. The heat dissipation fan according to claim 2, wherein the length of each second blade and the length of the arc are one-third of the length of the corresponding first blade and the length of the arc. 4. Blade structure.   2. The blade device for a heat radiating fan according to claim 1, wherein an upper surface and a side surface of each connection rib have an arc shape.

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