TWI444537B - Centrifugal fan - Google Patents

Description

Centrifugal fan

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

With the rapid development of the computer industry, the heat dissipation problem caused by the pursuit of high speed, high functionality, and miniaturization of the CPU has become more and more serious, which is more prominent in electronic devices with narrow internal space such as notebook computers. If the heat generated by the electronic components such as the CPU cannot be dissipated in a timely and effective manner, the performance of the electronic components will be greatly affected, and the service life of the electronic components will be shortened, so that the electronic components must be dissipated.

At present, the heat dissipation module is often used in the industry to dissipate heat from electronic components. The heat dissipation module includes a heat conductor, a heat sink, a heat pipe thermally connecting the heat conductor to the heat sink, and a centrifugal fan. The heat conductor is attached to the electronic component to absorb the heat generated by the electronic component, and the heat is transmitted to the heat sink by the heat pipe. The airflow generated by the centrifugal fan blows the heat sink and exchanges heat with the heat sink to dissipate the heat. Therefore, the centrifugal fan plays an extremely important role in the heat dissipation module.

Generally, the higher the rotational speed of the centrifugal fan, the larger the air volume, the more heat exchange on the radiator, but this inevitably leads to an increase in the noise of the centrifugal fan.

In view of this, it is necessary to provide a centrifugal fan with less noise.

A centrifugal fan includes a bottom plate, a cover plate, a side wall connected between the bottom plate and the cover plate, and a rotor housed in the receiving space formed by the bottom plate, the side wall and the cover plate, and an air outlet is arranged on the side wall The air outlet has a near wind end and a far wind end opposite to the near wind end. The air flow generated when the rotor is running flows from the far wind end to the near wind end via the inner surface of the side wall, and the side wall is near the far wind end. a tongue opening protruding into the receiving space, the surface of the tongue opening is inclined with respect to the bottom plate, and the surface of the tongue opening is provided with at least one groove extending in a direction parallel to the bottom plate, the at least one concave The groove extends along the surface of the tongue to define a plurality of ridges on the surface of the tongue.

A centrifugal fan includes a bottom plate, a cover plate, a side wall connected between the bottom plate and the cover plate, and a rotor housed in the receiving space formed by the bottom plate, the cover plate and the side wall, and an air outlet is arranged on the side wall The air outlet has a near wind end and a far wind end opposite to the near wind end. The air flow generated when the rotor is running flows from the far wind end to the near wind end via the inner surface of the side wall, and the side wall is near the far wind end. Providing a tongue opening protruding into the receiving space, the surface of the tongue opening is provided with a plurality of grooves and a plurality of ridges alternately distributed in a direction parallel to the bottom plate in a height direction, the plurality of grooves The plurality of ribs are distributed in a stepwise manner in the height direction of the tongue.

Compared with the prior art, the surface of the tongue in the centrifugal fan of the present invention has a slope shape with respect to the bottom plate, and a plurality of grooves and ridges are arranged on the surface of the tongue mouth, so that the surface of the tongue mouth is stepped in the height direction. Therefore, the distance from the end of the blade to the surface of the tongue is different with the height. The time at which the wake generated by the blade hits the surface of the tongue produces a narrow-frequency noise, which weakens the superposition of the narrow-frequency noise and the noise resonance. , thereby reducing the noise when the centrifugal fan is running.

10‧‧‧Base

11‧‧‧floor

111‧‧‧Air inlet

12‧‧‧ side wall

121‧‧‧air outlet

1211‧‧‧ Near wind end

1212‧‧‧The wind end

123‧‧‧ tongue mouth

1231‧‧‧ Groove

1232‧‧‧ ribs

20‧‧‧Rotor

21‧‧·wheels

22‧‧‧ fan leaves

30‧‧‧ Cover

1 is an exploded perspective view of a centrifugal fan in accordance with a preferred embodiment of the present invention.

2 is a perspective assembled view of the centrifugal fan shown in FIG. 1.

Figure 3 is a plan view of the base of the centrifugal fan shown in Figure 1.

Figure 4 is a cross-sectional view of the centrifugal fan of Figure 2 taken along line IV-IV.

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

Referring to FIG. 1 and FIG. 2 , the centrifugal fan includes a base 10 , a stator (not shown) received in the base 10 , a rotor 20 , and a cover 30 disposed on the base 10 .

The rotor 20 includes a hub 21 and a plurality of blades 22 extending radially outward from the periphery of the hub 21.

The base 10 includes a bottom plate 11 and a side wall 12 extending integrally from the periphery of the bottom plate 11. The side wall 12 is connected between the cover plate 31 and the bottom plate 11. The bottom plate 11, the side wall 12 and the cover plate 30 are enclosed together. A receiving space for housing the rotor 20. An air inlet 111 is respectively disposed at a position corresponding to the rotor 20 between the bottom plate 11 and the cover plate 30. The side wall 12 has a spiral shape, and one side thereof is provided with an air outlet 121 perpendicular to the air inlet 111. In this embodiment, the rotor 20 rotates in a counterclockwise direction. The air outlet 121 has a near wind end 1211 and a far wind end 1212 opposite the near wind end 1211. When the centrifugal fan is in operation, the rotor 20 The fan blades 22 drive airflow from the windward end 1212 to the near wind end 1211 via the inner surface of the side wall 12.

Referring to FIG. 3 and FIG. 4 together, the side wall 12 protrudes into the accommodating space near the distal wind end 1212, that is, horizontally protrudes into the base 10 to form a tongue opening 123. The tongue opening 123 is perpendicular to the bottom plate 11. The distance protruding into the base 10 in the direction gradually increases from the cover plate 30 toward the bottom plate 11, so that the surface of the tongue opening 123 is substantially sloped with respect to the bottom plate 11 (as shown in Fig. 4). And, in the horizontal direction parallel to the bottom plate 11, the tongue 123 is oriented The distance protruding from the base 10 gradually increases from the one end of the tongue opening 123 near the far wind end 1212 toward the other end away from the far wind end 1212 (as shown in FIG. 3), so that the surface of the tongue 123 is The horizontal direction parallel to the bottom plate 11 is curved. The surface of the tongue 123 is provided with a plurality of grooves 1231 extending in a horizontal direction parallel to the bottom plate 11, and each groove 1231 extends from the end of the tongue opening 123 away from the distal end 1212 via the surface of the tongue 123. The tongue 123 is adjacent to the other end of the distal wind end 1212 such that each groove 1231 is curved in the horizontal direction. The plurality of grooves 1231 are parallel to each other and are distributed from the top to the bottom on the surface of the tongue 123. The plurality of ridges 1232 are distributed on the surface of the tongue 123 from the top to the bottom. The plurality of grooves 1231 and the ridges 1232 are defined. The surface of the tongue opening 123 is alternately distributed along the height direction of the tongue opening 123, so that the surface of the tongue opening 123 is gradually stepped from the cover plate 30 toward the bottom plate 11. In the embodiment, the groove 1231 has a substantially "V" shape in the height direction, and the number of the grooves 1231 is three. The three grooves 1231 define three convex portions on the surface of the tongue 123. Article 1232.

Of course, the centrifugal fan of the present invention is not limited to the above design, and the distance from the tongue opening 123 to the base 10 in the height direction may also gradually decrease from the cover plate 30 to the bottom plate 11. In addition, the groove 1231 is in the height direction. The upper cross section may also be other shapes than the "V" shape, such as an arc shape, and the number of the grooves 1231 may be any other value.

Compared with the centrifugal fan in which the surface of the tongue is perpendicular to the bottom plate in the prior art, the surface of the tongue 123 in the centrifugal fan of the present invention has a slope shape with respect to the bottom plate 11, and is alternately arranged in the height direction on the surface of the tongue 123. The plurality of grooves 1231 and the ribs 1232 which are distributed and extended in the horizontal direction are such that the surface of the tongue 123 is stepped in the height direction, so that the distance from the end of the blade 22 to the surface of the tongue 123 varies with height. , The time when the wake generated by the blade 22 hits the surface of the tongue 123 to generate narrow-frequency noise is different, which reduces the superposition of the narrow-frequency noise and the noise resonance, and reduces the noise during the operation of the centrifugal fan.

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.

10‧‧‧Base

11‧‧‧floor

111‧‧‧Air inlet

12‧‧‧ side wall

121‧‧‧air outlet

1211‧‧‧ Near wind end

1212‧‧‧The wind end

1231‧‧‧ Groove

1232‧‧‧ ribs

20‧‧‧Rotor

21‧‧·wheels

22‧‧‧ fan leaves

30‧‧‧ Cover

Claims (9)

A centrifugal fan includes a bottom plate, a cover plate, a side wall connected between the bottom plate and the cover plate, and a rotor housed in the receiving space formed by the bottom plate, the side wall and the cover plate, and an air outlet is arranged on the side wall The air outlet has a near wind end and a far wind end opposite to the near wind end. The air flow generated when the rotor is running flows from the far wind end to the near wind end via the inner surface of the side wall, and the side wall is near the far wind end. Providing a tongue opening protruding into the receiving space, wherein the surface of the tongue is sloped relative to the bottom plate, and the surface of the tongue is provided with at least one groove extending in a direction parallel to the bottom plate, At least one groove extends along the surface of the tongue to define a plurality of ribs on the surface of the tongue, and the groove and the rib are distributed in a stepwise manner in the height direction of the tongue. The centrifugal fan of claim 1, wherein the groove is curved in an extending direction. The centrifugal fan according to claim 1, wherein the groove has a "V" shape in a cross section in the height direction. The centrifugal fan according to claim 1, wherein the number of the grooves is plural, and the plurality of grooves are parallel to each other and are distributed from top to bottom on a surface of the tongue, the plurality of grooves and the plurality of grooves The ridges are alternately distributed on the surface of the tongue in the height direction. A centrifugal fan includes a bottom plate, a cover plate, a side wall connected between the bottom plate and the cover plate, and a rotor housed in the receiving space formed by the bottom plate, the cover plate and the side wall, and an air outlet is arranged on the side wall The air outlet has a near wind end and a far wind end opposite to the near wind end. The air flow generated when the rotor is running flows from the far wind end to the near wind end via the inner surface of the side wall, and the side wall is near the far wind end. There is a tongue opening protruding into the receiving space, and the improvement is that the surface of the tongue is alternately arranged in the height direction and extends in a direction parallel to the bottom plate. a groove and a plurality of ribs, wherein the plurality of grooves and the plurality of ribs are arranged in a stepwise manner in a height direction of the tongue. The centrifugal fan according to claim 5, wherein the distance from the tongue opening in the height direction to the receiving space gradually increases from the cover plate to the bottom plate. The centrifugal fan of claim 6, wherein the plurality of grooves and the plurality of ribs are arranged in a stepwise manner from the cover plate toward the bottom plate. The centrifugal fan of claim 5, wherein the surface of the tongue is sloped relative to the bottom plate. The centrifugal fan according to claim 5, wherein the tongue protrudes in a direction parallel to the bottom plate and protrudes into the receiving space from the tongue end to one end of the far wind end and away from the other end of the far wind end. Gradually increase and then gradually decrease.