Fan with fluid diversion mechanism

A fan with a fluid diversion mechanism includes a fan frame structure and a vane wheel, and the fan frame structure has a containing space, an air inlet and an air outlet, and the fan frame structure includes a coaming plate having a plurality of diversion components, and an opening formed at any one of the diversion components and arranged in a direction towards the air inlet, and the vane wheel is installed in the containing space of the fan frame structure, so that when the vane wheel is operated, air current produced by vanes of the fan guides the air current entered from the diversion component to an external side of a retaining platform which is a leeward side, and the air current has an effective coverage for blowing a desired heat source and improves the overall airflow and air pressure of the fan.

This application is based on and claims the benefit of Taiwan Application No. 100221561 filed Nov. 15, 2011 the entire disclosure of which is incorporated by reference herein.

FIELD OF THE INVENTION

The present invention relates to a heat dissipating fan, in particular to the fan with a fluid diversion mechanism that is applied to a heat source of an electronic device.

BACKGROUND OF THE INVENTION

In recent years, integrated circuits of electronic devices become increasingly smaller, and the computing speed becomes increasing greater, and thus high temperature will be produced from the high performance of the electronic device such as a central processing unit (CPU), and the high temperature will retard the computing speed of the CPU or even cause a system down of a computer. To overcome this problem, a heat dissipating fan is generally installed to the CPU of the computer to enhance the heat dissipation capability. However, a motor is installed at the center of the heat dissipating fan, and the bottom area of the motor is superimposed onto the CPU chip, so that the air-blowing efficiency at the operating area of the center position will give rise of an leeward issue and the expected heat dissipation effect cannot be achieved, or the overheated CPU with a high temperature will cause a system down of the computer.

As disclosed in Taiwan Utility Model No. M287881, a heat dissipating fan comprises a plurality of diversion members, and at least one rib coupled between the diversion members, wherein the diversion member is extended in a curved direction and disposed in a non-concentric circular shape to define an opening, and a fan vane wheel with a plurality of vanes is installed, and the distance from an end of each vane to each diversion member is not consistent, so as to reduce the secondary flow phenomenon occurred between the vane and the diversion member. Although the heat dissipation effect can be improved by increasing the air input by the intervals, another problem of wind shear sound will be resulted easily by the wind resistance. In other words, the air pressure cannot be increased effectively, and noises will be produced. Obviously, the conventional heat dissipating fan requires feasible solutions and improvements.

SUMMARY OF THE INVENTION

Therefore, it is a primary objective of the present invention to provide a fan with a fluid diversion mechanism comprising a coamimg plate with a diversion component and a vane wheel to improve the airflow of the heat dissipating fan and reduce the back pressure of the heat dissipating fan.

To achieve the aforementioned objective, the present invention provides a fan with a fluid diversion mechanism, comprising a fan frame structure and a vane wheel, wherein the fan frame structure has a containing space provided for installing the vane wheel, and an air inlet and an air outlet formed at the fan frame structure, and the fan frame structure includes a coaming plate having a plurality of diversion components and an opening formed at each of the diversion components and arranged in a direction towards the air inlet.

The present invention further has the following effect. With the plurality of diversion components installed on the coaming plate of the fan frame structure, internal turbulence, backflow and noise produced by the operation of the vane wheel can be reduced effectively.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The technical contents of the present invention will become apparent with the detailed description of preferred embodiments accompanied with the illustration of related drawings as follows.

With reference toFIGS. 1 to 4, the present invention provides a fan with a fluid diversion mechanism for dissipating the heat of a heat source3, and the fan comprises a fan frame structure1and a vane wheel2.

The fan frame structure1has a containing space14provided for installing the vane wheel2, and an air inlet15and an air outlet16formed at the fan frame structure1(as shown inFIG. 4), and the fan frame structure1of this preferred embodiment includes a base11, a coaming plate12and a cover13, and the cover13is coupled to the base11through the coaming plate12. The fan frame structure1is made of plastic or metal.

The base11includes a retaining platform111, a plurality of ribs112, a plurality of connecting columns113, a plurality of snap hooks114and a hollow column115, wherein the retaining platform111is coupled to an outer frame through each rib112and disposed at the center position of the base11; the retaining platform111is provided for placing an electric motor part, and the hollow column115is extended upwardly from the center position of the retaining platform111. In addition, each connecting column113is formed separately at the four corners of the base11, and each snap hook114is disposed between any two adjacent connecting columns113.

The cover13includes a plurality of snap hooks131and a plurality of sheath columns132, and each sheath column132is disposed separately at four corners of the cover13, and each snap hook131is disposed between any two sheath columns132. Each sheath column132is coupled and combined to each of the connecting columns113respectively.

In this preferred embodiment, the coaming plate12is a circular thin plate having a containing space14formed therein, and a plurality of upper snap slots121and a plurality of lower snap slots123formed in upper and lower edge areas of the coaming plate12respectively, and each upper snap slot121is provided for snapping and coupling each snap hook131of the cover13, and each lower snap slot123is provided for snapping and coupling each snap hook114of the base11. In addition, the coaming plate12has a plurality of diversion components122installed at a middle area of the coaming plate12, and each diversion component122includes a convex arc plate1222extended from the exterior of the coaming plate12and an opening1221formed at a top area of the convex arc plate1222and arranged in a direction towards the air inlet15. Each convex arc plate1222has a cross-sectional shape substantially in a semi-funnel shape. In addition, an inverted bevel1223is formed on an inner side of the coaming plate12at the periphery of each opening1221for guiding air to flow into each opening1221easily.

In this preferred embodiment, the vane wheel2can be made of plastic or metal, and the vane wheel2is an axial flow vane wheel comprising a hub21and a plurality of vanes22, wherein each vane22is extended radially and outwardly from the center of the hub21and the hub21is installed at a position corresponding to the hollow column115, so that the vane wheel2can be installed into the containing space14of the fan frame structure1.

With reference toFIGS. 5 and 6, the fan of the present invention is installed above a heat source3, and an electric motor (not labeled in the figure) is provided for driving the vane wheel2to rotate, so as to drive surrounding air to enter from the air inlet15into the containing space14and discharge the air from the air outlet16. The air around the external periphery of the coaming plate12is guided to enter from each opening1221of each diversion component122into the containing space14to improve the input and output airflows.

According to Bernoulli's Theory, flow velocity is inversely proportional to pressure. In a fluid (which is air or any other cooling gas used in a preferred embodiment of the present invention), a fluid (referring to the air driven by the vane wheel2) with a faster flow velocity produces a negative air pressure due to a lower fluid density and a smaller pressure than that of the fluid with a slower flow velocity. As a result, a suction force is produced to suck the slower fluid (which is the air or cooling gas at the external side of the coaming plate12) to the faster fluid to offset the pressure difference. Therefore, the present invention increases the pressure of the output air and uniformly pushing out an air current from the air outlet16to improve the overall heat dissipation efficiency and reduce noises. In addition, the direction arrangement of each opening1221of each diversion component122can reduce the backflow and turbulence of the air current.

With reference toFIG. 7for a fan in accordance with the second preferred embodiment of the present invention, the difference between this preferred embodiment and the first preferred embodiment resides on that each diversion component122′ of the fan frame structure1aof this preferred embodiment includes a concave arc plate1222′ concavely recessed into the coaming plate12and an opening1221′ formed at a bottom area of the concave arc plate1222′. Each opening1221′ is arranged in a direction towards the air inlet15. Each concave arc plate1222′ has a cross-sectional shape substantially in a semi-funnel shape. In addition, each opening1221′ has an inverted bevel1223′ formed at an inner side of the periphery of the coaming plate12for guiding air to flow into each opening1221′ easily.

With reference toFIG. 8for a fan in accordance with the third preferred embodiment of the present invention, the difference between this preferred embodiment and the previous preferred embodiments resides on that the fan frame structure lb of this preferred embodiment includes a coaming plate12and a cover13, wherein each upper snap slot121formed at the coaming plate12and each snap hook131formed at the cover13are used for snapping and connection. Each diversion component122includes a convex arc plate1222extended from the exterior of the coaming plate12and an opening1221formed at a top area of the convex arc plate1222and arranged in a direction towards the air inlet15. Each opening1221has an inverted bevel1223formed on an inner side of the periphery of the coaming plate12.

With reference toFIG. 9for a fan in accordance with the fourth preferred embodiment of the present invention, the difference between this preferred embodiment and the previous preferred embodiments resides on that the fan frame structure1cof this preferred embodiment has diversion components122,122′ of different types installed on different sides of the coaming plate12respectively, wherein a portion of the diversion components122includes a convex arc plate1222extended from the exterior of the coaming plate12and an opening1221formed at the top area of the convex arc plate1222, and the other portion of the diversion components122′ includes a concave arc plate1222′ concavely recessed into the coaming plate12and an opening1221′ formed at the bottom area of the concave arc plate1222′.

With reference toFIG. 10for a fan in accordance with the fifth preferred embodiment of the present invention, the difference between this preferred embodiment and the previous preferred embodiments resides on that the fan frame structure1dof this preferred embodiment has diversion components122,122′ of different types installed on the coaming plate12, and the diversion component122are disposed between any two diversion components122′, and each diversion component122,122′ has a structure substantially the same as those described above, and thus will not be repeated.

The fan with a fluid diversion mechanism in accordance with the present invention further has the following advantages: 1. The invention can reduce the range of the leeward area effectively. 2. The invention can reduce backflow and turbulence. 3. The invention can increase the air pressure of the air outlet. 4. The invention can reduce the noise produced during the operation of the vane wheel. 5. The invention can fully utilize the air current produced by the heat dissipating fan.

In summation of the description above, the present invention achieves the expected objectives and overcomes the drawbacks of the prior art as well as complying with the patent application requirements, and thus is duly filed for patent application. While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.