CN2465232Y - Upside down centrifugal fan - Google Patents

Abstract

A centrifugal fan able to be installed to a heat radiating plate is composed of a frame fixed to said heat radiating plate and consisting of an upper surface far from said heat radiating plate, a lateral surface substantially perpendicular to said upper surface, at least one air inlet on said upper surface, and an air outlet on said lateral surface. In addition, the centrifugal fan further comprises a stator part which is fixed in the frame seat in a mode of being hung upside down on the upper surface, and the stator part comprises a circuit board which is close to the upper surface and is far away from the heat dissipation plate.

Description

Upside down centrifugal fan

The utility model relates to an upside-down centrifugal fan, in particular to an upside-down centrifugal fan which can prolong its service life.

In recent years, the size of electronic products tends to shrink, and their thickness is becoming thinner and thinner. For example, notebook computers tend to become thinner and thinner. The following will take a notebook computer as an example for illustration. The cooling system on a notebook computer includes a fan and a cooling plate, which are used to dissipate the heat generated by the notebook computer during operation. In order to meet the needs of thinner notebook computers, the cooling system must be thinner.

FIG. 4A shows a top view of a conventional cooling system, and FIG. 4B is a front view of FIG. 4A. Referring to FIG. 4A , the cooling system includes an axial fan 100 and a cooling plate 200 . The axial flow fan 100 includes: a motor (not shown) for driving, which has a circuit board (not shown) at its bottom; a frame 101, which is provided with four ribs 102 and an air outlet 103; a shaft The flow impeller 104 has a hub portion 105 and a plurality of blades 106 . A plurality of fins 201 and a plurality of channels 202 for heat dissipation are formed on the heat dissipation plate 200 .

Since the heat dissipation system must be thinned, the conventional technology of directly installing the axial fan 100 above the fins 201 cannot be adopted in products such as notebook computers.

Referring to FIG. 4B , the cooling plate 200 is an L-shaped structure, and the axial flow fan 100 is installed on the right plane of the cooling plate 200 . When the axial fan 100 operates, it draws air in and exhausts it. The air flow direction is the direction of the arrow, that is, it enters the axial fan 100 from above the axial fan 100 , and then flows out from the frame 101 to the channel 202 of the heat sink 200 , so as to achieve the heat dissipation function.

In the prior art, the axial flow fan cannot provide high wind pressure, and under the obstruction of the plurality of fins 201 , a good heat dissipation effect cannot be achieved. In addition, the cooling plate at the bottom of the motor is quite close to the cooling plate 200, or is in direct contact with it. Generally speaking, the temperature of the cooling plate 200 is much higher than the temperature of the fan itself when it is running. Therefore, the high temperature of the cooling plate 200 will reduce the service life of the fan.

FIG. 5A shows a top view of another conventional cooling system, and FIG. 5B is a front view of FIG. 5A . Referring to FIG. 5A , the heat dissipation system includes a frameless axial flow fan and a heat dissipation plate 400 . The axial fan includes a motor (not shown) with a circuit board (not shown) at its bottom; a base 301 ; and an axial impeller 304 including a hub 305 and blades 306 . The heat sink 400 includes a plurality of fins 401 and a plurality of channels 402 for heat dissipation; a fan base 403 for accommodating an axial flow fan without a frame and providing an appropriate flow path for it; and an air outlet 404, It is provided on the right side of the fan base 403 for air to flow to the channel 402 .

Referring to FIG. 5B , the axial flow fan is installed in the fan base 403 of the cooling plate 400 , and when the axial flow fan is running, it sucks in air and discharges it. The airflow direction is the direction of the arrow, that is, it enters the axial fan from above the axial fan, and then flows out from the air outlet 404 to the channel 402 of the cooling plate 400, so as to achieve the heat dissipation function.

In the prior art, the axial flow fan cannot provide high wind pressure, and under the obstruction of the plurality of fins 401 , a good heat dissipation effect cannot be achieved. In addition, the circuit board at the bottom of the motor is relatively close to the cooling plate 400, or is in direct contact with it.

Generally speaking, the temperature of the cooling plate 400 is much higher than the temperature of the fan itself when it is running. Therefore, the high temperature of the cooling plate 400 will also reduce the service life of the fan. Furthermore, the cooling plate 400 suitable for an axial fan without a fan frame must have a fan base 403 to control the airflow generated by the axial fan. The fan seat 403 is integrally formed with the fins 401 and the channel 402 . Therefore, the fan base 403 is usually made of metal such as aluminum. If the fan base 403 is changed to be integrated with the axial flow fan, then the material constituting the fan base 403 is plastic which is lighter than metal. Therefore, compared with the heat dissipation system of FIG. 4A , the weight of the heat dissipation system of FIG. 5A is further increased.

Therefore, an object of the present invention is to provide an upside-down centrifugal fan, which can prevent the electronic components in the fan from being affected by the high-temperature heat dissipation plate, thereby prolonging its service life. In addition, the upside-down centrifugal fan can provide better heat dissipation effect than the conventional axial flow fan.

An implementation style of the present invention relates to an upside-down centrifugal fan, which is used to install on the heat dissipation plate, comprising: a frame seat, fixed on the heat dissipation plate, and the frame seat includes: an upper surface, away from the heat dissipation plate; The surface is substantially perpendicular to the upper surface; at least one air inlet is opened on the upper surface; and one air outlet is opened on the side surface. In addition, the centrifugal fan further includes a stator part, which is fixed in the frame by being hung upside down on the upper surface. The stator part includes a circuit board, and the circuit board is close to the upper surface and away from the cooling plate.

The above-mentioned frame seat may further include: a bearing seat connected to the upper surface of the frame seat; and at least one rib located on the upper surface of the frame seat for fixing the bearing seat. The air inlet formed by the ribs.

The above-mentioned upside-down centrifugal fan may further include a centrifugal impeller, which surrounds the stator part and can rotate against the stator part. The centrifugal impeller includes a hub part and a plurality of blades connected to the hub part. The connecting portion between the hub and the plurality of blades is close to the heat dissipation plate and away from the upper surface of the frame.

Preferred embodiments of the present utility model will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic top view of a heat dissipation system according to a preferred embodiment of the present invention. FIG. 2 shows a front view of FIG. 1 . Referring to FIG. 1 and FIG. 2 , the fan cooling system includes an upside-down centrifugal fan 10 and a cooling plate 30 . The upside-down centrifugal fan 10 includes a frame base 11 fixed on the cooling plate 30 , a stator portion 16 , and a centrifugal impeller 20 . The frame seat 11 includes an upper surface 12 , a side surface 13 , three air inlets 14 , an air outlet 15 , a bearing seat 18 and three ribs 19 . The centrifugal impeller 20 includes a hub 21 and a plurality of blades 22 . The heat sink 30 has a plurality of fins 31 and a plurality of channels 32 for heat dissipation.

The flow channel 26 is formed inside the frame seat 11 to collect the air flow and increase the wind pressure of the centrifugal fan. The upside-down centrifugal fan 10 is installed on the cooling plate 30 . The side surface 13 is substantially perpendicular to the upper surface 12 . The air inlet 14 is defined on the upper surface 12 . The air outlet 15 is opened on the side surface 13 . The three air inlets 14 are formed by the upper surface 12 of the frame seat 11 and three ribs 19 . The ribs 19 can be used to support the bearing housing 18 so as to fix the stator part 16 .

When the upside-down centrifugal fan 10 is in operation, the direction of the airflow is as shown by the arrow in FIG. 2 to dissipate heat. Specifically, the air flows into the upside-down centrifugal fan 10 from the three air inlets 14 , and then flows into the plurality of channels 32 of the cooling plate 30 through the air outlets 15 to dissipate heat from the cooling plate 30 .

The features of the present invention will be described below with reference to a sectional view.

FIG. 3 shows a cross-sectional view of the upside-down centrifugal fan of FIG. 1 . Referring to FIG. 3 , the upside-down centrifugal fan 10 according to the present invention is mounted on a cooling plate 30 . The upside-down centrifugal fan 10 includes a frame base 11 , a stator portion 16 , a bearing seat 18 , a centrifugal impeller 20 , and a bearing 24 . The frame seat 11 includes an upper surface 12 , a side surface 13 , three air inlets 14 and an air outlet 15 . The upper surface 12 is away from the heat dissipation plate 30 . The side surface 13 is substantially perpendicular to the upper surface 12 . Three air inlets 14 are opened on the upper surface 12 , and air outlets 15 are opened on the side surface 13 . The stator part 16 includes a circuit board 17 and a plurality of electronic components 25 .

The bearing seat 18 is connected to the upper surface 12 of the frame seat 11 and uses ribs 19 (see FIG. 1 ) as a supporting structure. The centrifugal impeller 20 includes a hub 21 and a plurality of blades 22 . A plurality of connection portions 23 are formed where the hub portion 21 is connected to the plurality of blades 22 .

Bearing 24 is fixed in bearing 18 . The stator part 16 is fixed in the frame seat 11 in a manner of hanging upside down from the upper surface 12 . Electronic components 25 are mounted on the circuit board 17 . In general, electronic components 25 are easily damaged at high temperatures.

Compared with the conventional technology, the stator part 16 of the present invention is installed on the cooling plate 30 in an upside-down manner. Since air must enter through the air inlet 14 , the connecting portion 23 must be far away from the upper surface 12 and close to the heat dissipation plate 30 .

Although the temperature of the cooling plate 30 is quite high, since the stator portion 16 is fixed in the frame seat 11 in an upside-down manner, the electronic components 25 mounted on the circuit board 17 are as far away from the high temperature cooling plate 30 as possible. Therefore, the high temperature of the radiator plate 30 does not have a great influence on the electronic component 25 . Therefore, the service life of the inverted centrifugal fan 10 is extended.

In contrast to the conventional technology, since the circuit board is very close to the high-temperature heat dissipation plate, the high temperature will damage the electronic components mounted on the circuit board, thereby shortening the service life of the fan.

On the other hand, the upside-down centrifugal fan 10 used in the present invention can provide higher wind pressure than the axial flow fan, which helps to improve the heat dissipation effect.

Furthermore, the upside-down centrifugal fan 10 used in the utility model has its own flow channel 26, so the flow channel of the upside-down centrifugal fan 10 does not need to be formed on the cooling plate 30, which can reduce the weight of the entire heat dissipation system, which is beneficial The demand for lightweight electronic products.

The specific embodiments proposed in the detailed description of the preferred embodiments are only used to illustrate the technical contents of the present utility model, rather than restricting the present utility model to the above-mentioned embodiments in a narrow sense. Various changes and implementations made without departing from the spirit of the utility model and the appended claims all belong to the scope of the utility model. For example, the number of air inlets 14 and ribs 19 is not limited to three, and one or more air inlets 14 and ribs 19 can also make the upside-down centrifugal fan 10 work normally.

Fig. 1 shows a schematic top view of the combination of an upside-down centrifugal fan and a cooling fin according to a preferred embodiment of the present invention.

FIG. 2 shows a front view of FIG. 1 .

FIG. 3 shows a cross-sectional view of the upside-down centrifugal fan of FIG. 1 .

FIG. 4A shows a top view of a conventional heat dissipation system.

Figure 4B is a front view of Figure 4A.

FIG. 5A shows a top view of another conventional cooling system.

Figure 5B is a front view of Figure 5A.

【Symbol Description】

10～Inverted centrifugal fan

11～Frame seat

12～upper surface

13～side surface

14～air inlet

15～air outlet

16～Stator part

17～circuit board 18～shaft bearing seat 19～rib 20～centrifugal impeller 21～hub part 22～blade 23～connecting part 24～shaft bearing 25～electronic parts 26～flow channel 30～radiating plate 31～wing 32～channels

Claims (3)

1. reversely hung Yong centrifugal fan in order to be installed on the heat sink, is characterized in that comprising:

One skeleton frame is fixed on this heat sink, and this skeleton frame comprises:

One upper surface is away from this heat sink;

One side surface, vertical in fact this upper surface;

At least one air intake vent is opened on this upper surface; And

One air outlet is opened on this side surface; And

One stator department is fixed in this skeleton frame to hang upside down in the mode of this upper surface, should

Stator department comprises a circuit board, and this circuit board is near this upper surface and away from this heat sink.

2. reversely hung Yong centrifugal fan according to claim 1 is characterized in that described skeleton frame also comprises:

One bearing seat is connected with the upper surface in this skeleton frame; And

At least one rib is positioned on the upper surface of this skeleton frame, and in order to fix this bearing seat, this at least one air intake vent is formed by the upper surface of this skeleton frame and this at least one rib.

3. reversely hung Yong centrifugal fan according to claim 2, it is characterized in that also comprising a receded disk impeller, it comprises this stator department, and can rotate this stator department, this receded disk impeller comprises a hub portion and the plural blade that is connected with this hub portion, wherein, the coupling part of this hub portion and this plural number blade is near this heat sink and away from the upper surface of this skeleton frame.

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