TW201934884A - Centrifugal fan - Google Patents

Abstract

The present disclosure provides a centrifugal fan including a housing, a spacer, and a rotor. The housing includes a top plate, a bottom plate, and a side wall connecting the top plate and the bottom plate. The top plate, the bottom plate, and the side wall form a first outlet and a second outlet. The spacer is disposed in the housing and connecting between the bottom plate and the top plate. The spacer divides the space in the housing into a first space connecting to the first outlet and a second space connecting to the second outlet. The space has a first opening communicating the first space and the second space. The rotor is rotatably disposed in the second space.

Description

Centrifugal fan

This disclosure relates to a centrifugal fan.

Generally, the two air outlets of a centrifugal fan with dual air outlets can be divided into a main air outlet and a secondary air outlet. The airflow follows the direction of rotation of the fan blades. The first air outlet that reaches it is the main air outlet, which has a large volume and pressure. Then the airflow continues in the direction of the fan blades and reaches the second air outlet as the secondary air outlet. The air volume and air pressure of the second outlet are small. Because the air outlet angles and distributions of the airflows at the two air outlets are different, the heat dissipation capability at the two air outlets is uneven, and noise is generated.

The present disclosure proposes a centrifugal fan including a casing, a partition, and a fan rotor. The casing includes a top plate, a bottom plate, and a side wall connected between the bottom plate and the top plate. The top plate, the bottom plate and the side wall together form a first air outlet and a second air outlet. The partition is disposed in the casing and is connected between the bottom plate and the top plate, and partitions the first space connected to the first air outlet and the second space connected to the second air outlet in the housing. The partition has a first opening, and the first opening communicates with the first space and the second space. The fan rotor is rotatably disposed in the second space.

In summary, the centrifugal fan proposed in this disclosure can provide airflow in different directions by forming a first air outlet and a second air outlet through the casing. A partition is provided between the first air outlet and the rotating shaft of the fan blade rotor, which increases a section of pressurization zone, so that the airflow is more stable in the centrifugal fan. The partition is provided with a first opening and a second opening, and the air volume and airflow smoothness of the first and second air outlets are adjusted by adjusting the size, position, and shape of the first and second openings. .

100‧‧‧ centrifugal fan

110‧‧‧shell

110a‧‧‧first air outlet

110b‧‧‧second air outlet

111‧‧‧Top plate

111a‧‧‧air inlet

112‧‧‧ floor

113‧‧‧Side wall

113a‧‧‧mouth

120‧‧‧ divider

120a‧‧‧First opening

120b‧‧‧Second opening

130‧‧‧fan blade rotor

131‧‧‧ shaft

132‧‧‧Fan leaves

A‧‧‧Pressure zone

L1‧‧‧First Baseline

L2‧‧‧Second Baseline

L3‧‧‧ Third Baseline

R1‧‧‧ first angle

R2‧‧‧ second angle

R‧‧‧ Direction of rotation

S1‧‧‧First Space

S2‧‧‧Second Space

X‧‧‧ axis

FIG. 1 is a perspective view of a centrifugal fan according to an embodiment of the disclosure.

FIG. 2 is a three-dimensional exploded view of the centrifugal fan in FIG. 1.

FIG. 3 is a schematic plan view of the centrifugal fan in FIG. 1 with the top plate removed.

Fig. 4 shows the centrifugal fan of Fig. 3 and shows the positional relationship between the first opening and the second opening.

FIG. 5 is a schematic view of the partition viewed from the first air outlet of the centrifugal fan of FIG. 4.

This disclosure proposes a centrifugal fan with multiple air outlets to meet different heat dissipation requirements. Please refer to Figure 1 and Figure 2. FIG. 1 is a perspective view of a centrifugal fan 100 according to an embodiment of the disclosure. FIG. 2 is an exploded view of the centrifugal fan 100 in FIG. 1. As shown in Figure 1 and Figure 2, The centrifugal fan 100 proposed in the present disclosure includes a casing 110, a partition 120, and a fan rotor 130.

As shown in FIG. 2, the housing 110 includes a top plate 111, a bottom plate 112, and a side wall 113. The side wall 113 connects the top plate 111 and the bottom plate 112 and forms an accommodation space. The top plate 111, the bottom plate 112, and the side wall 113 also define a first air outlet 110a and a second air outlet 110b. The side wall 113 has a tongue opening 113a near the second air outlet 110b.

In this embodiment, the direction of the air from the first air outlet 110a is perpendicular to the direction of the air from the second air outlet 110b. In an embodiment, the direction of the air from the first air outlet 110a and the direction of the air from the second air outlet 110b can be arbitrarily changed according to practical requirements.

As shown in FIG. 2, the partition 120 is disposed in the casing 110 and connects the top plate 111, the side wall 113 and the bottom plate 112. The partition 120 separates the first space S1 and the second space S2 in the casing 110. The first space S1 refers to a space connected to the first air outlet 110a, and the second space S2 refers to a space connected to the second air outlet 110b. The partition 120 has a first opening 120a and a second opening 120b. The air flow can flow between the first space S1 and the second space S2 through the first opening 120a and the second opening 120b.

As shown in FIG. 2, the fan rotor 130 is rotatably provided in the second space S2. The fan rotor 130 is provided between the tongue 113 a and the partition 120.

In the present embodiment, the fan rotor 130 includes a rotating shaft 131 and a plurality of fan blades 132. The fan rotor 130 rotates in the housing 110 in the rotation direction R based on the axis X. An air inlet is provided on the top plate 111 at a position corresponding to the rotating shaft 131 111a. As shown in FIG. 1, the air inlet 111 a completely exposes the rotating shaft 131 and partially exposes the fan blades 132. With the above configuration, the fan rotor 130 can suck airflow through the air inlet 111a during rotation, so that the airflow flows to the first air outlet 110a and the second air outlet 110b.

Please refer to FIG. 3, which is a schematic plan view of the centrifugal fan 100 in FIG. 1 after the top plate 111 is removed. As shown in FIG. 3, the fan rotor 130 rotates along the rotation direction R based on the axis X. The direction of rotation R refers to the direction counterclockwise in the drawing in FIG. 3. The distance between the side wall 113 and the rotating shaft 131 gradually increases from the tongue opening 113a along the rotation direction R to the first air outlet 110a. The distance between the partition member 120 and the rotating shaft 131 gradually increases from the tongue 113 a along the rotation direction R to the second air outlet 110 b. After the airflow enters the area between the fan blades 132, it is pushed by the fan blades 132 and flows along the rotation direction R. The gradually expanding shape between the side wall 113, the partition 120, and the rotating shaft 131 makes the air resistance of the air flow gradually smaller (the static pressure becomes smaller), and the wind speed of the air flow becomes larger (the dynamic pressure becomes larger). Therefore, a region between the side wall 113 and the partition 120 and the rotating shaft 131 from the tongue 113 a along the rotation direction R to the second air outlet 110 b may be defined as the supercharging region A (that is, a region where the dynamic pressure increases).

As shown in FIG. 3, since the partition 120 has a first opening 120a and a second opening 120b, when the airflow passes through the area between the partition 120 and the rotating shaft 131, a part of the airflow passes through the first opening from the second space S2. 120a and the second opening 120b flow through the first space S1 toward the first air outlet 110a. The remaining airflow continues to flow in the direction of the second air outlet 110b along the rotation direction R.

As shown in FIG. 3, in the embodiment of the centrifugal fan 100, the side wall 113 is counted from the tongue 113a and along the rotation direction R (that is, the counterclockwise direction of the drawing) The position connected to the partition 120 is a curved surface as a whole, so that the air flow in the pressurized area A can be smooth. However, in some embodiments, the arc surface can be appropriately adjusted to other shapes, such as various conic or streamline curves, according to practical requirements.

As shown in FIG. 3, in the embodiment of the centrifugal fan 100, the side of the partition 120 facing the fan rotor 130 has an arc surface, and the center of curvature of the arc surface is located in the second space S2. The curved surface of the partition 120 can ensure smooth airflow in the pressurized area A. In one embodiment, the arc surface can be adjusted to other shapes, such as various conic curves or streamline curves, according to actual needs.

As shown in FIG. 3, in the embodiment of the centrifugal fan 100, a part of the second space S2 surrounded by the side wall 113 and the partition 120 is a cylindrical space, so that the air flow in the second space S2 is smooth.

Please refer to FIG. 4, which shows the centrifugal fan 100 with the fan blades 132 removed in FIG. 3, and the positional relationship between the first opening 120 a and the second opening 120 b is shown. As shown in FIG. 4, on the plane of the vertical axis X (that is, the surface of FIG. 4), the connection line between the tongue 113a and the axis X is defined as the first reference line L1; the second air outlet 110b is far from the tongue 113a A line connecting one end with the axis X is defined as a second reference line L2; and a line connecting a point in the first opening 120a with the axis X is defined as a third reference line L3.

As shown in FIG. 4, the first reference line L1 to the second reference line L2 are rotated along the rotation direction R by a first angle R1 (specifically, the first reference line L1 and the second reference line L2 are along Obtuse angle pinched by the drawing counterclockwise). The first reference line L1 to the third reference line L3 are rotated along the rotation direction R by a second angle R2 (specifically, the first reference line L1 and the third reference line L3 are along Obtuse angle pinched by the drawing surface counterclockwise). As shown in FIG. 4, a position where 10% of the first angle R1 is rotated by the first reference line L1 in the rotation direction R is indicated by 10%. For example, when the first angle R1 is 300 degrees, 10% of the first angle R1 is 30 degrees, and the position where the first reference line L1 is rotated 30 degrees along the rotation direction R is labeled 10%. Similarly, the position rotated 20% of the first angle R1 along the rotation direction R is indicated by 20%, and the rest can be deduced by analogy.

In the present embodiment, the second space S2 has the smallest air pressure at the positions marked 70% to 90% in the fourth figure. Therefore, the first opening 120a is provided at the positions marked 70% to 90% to reduce the second space Loss of air pressure in S2. In practical applications, the position of the first opening 120a may be changed according to requirements, and the disclosure is not limited to the above. In different embodiments, the position of the lowest air pressure is not necessarily located at 70% to 90%, and the position of the first opening 120a may be designed according to the actual situation.

In the embodiment of the centrifugal fan 100, the airflow passing through the first opening 120a may only flow to a portion of the first air outlet 110a close to the second air outlet 110b. In order to make the air flow out of the first air outlet 110a uniform, the second opening 120b may be disposed on the partition 120 farther away from the second air outlet 110b than the first air outlet 110a, so that the air flow of the second opening 120b can be Flow to the portion where the first air outlet 110a is far from the second air outlet 110b. With the above arrangement, the air flow from the first air outlet 110a as a whole is relatively uniform.

In the embodiment of the centrifugal fan 100, the area of the second opening 120b is smaller than the area of the first opening 120a. As described above, since the first opening 120a is set at a position where the air pressure is low and the flow rate per unit area is low, the performance of the first opening 120a on the second air outlet 110b is small. In contrast, the performance of the second opening 120b on the second air outlet 110b is relatively small. Big. Therefore, in some embodiments, the area of the second opening 120b may be smaller than the area of the first opening 120a. In this way, the airflow of the first air outlet 110a can be provided without greatly affecting the performance of the second air outlet 110b such as the flow rate, the flow velocity, and the uniformity. In the embodiment of the centrifugal fan 100, the total area of the first opening 120a and the second opening 120b is between 10% and 50% of the area of the second air outlet 110b. The above design makes the air volume of the first air outlet 110a smaller than the second air outlet 110b, so that the second air outlet 110b can still maintain a high air flow. In practical applications, the areas of the first openings 120a and the second openings 120b can be freely adjusted to control the ratio of the air volume of the first air outlet 110a and the second air outlet 110b.

Please refer to FIG. 5, which illustrates a schematic view of the partition 120 viewed from the first air outlet 110 a of the centrifugal fan 100 in FIG. 4. As shown in FIG. 5, the shapes of the first opening 120 a and the second opening 120 b are both rectangular. In some embodiments, the first opening 120a and the second opening 120b have other shapes, and the shapes of the first opening 120a and the second opening 120b can be arbitrarily changed according to practical requirements.

As shown in FIG. 5, both the first opening 120 a and the second opening 120 b are connected to the top plate 111 (refer to FIG. 2). In some embodiments, the first opening 120 a and the second opening 120 b may be connected to the bottom plate 112. In some embodiments, the first opening 120 a and the second opening 120 b may be connected to the top plate 111 by the bottom plate 112. In some embodiments, the first opening 120 a and the second opening 120 b are located in the partition 120 and are not connected to the top plate 111 or the bottom plate 112. The setting positions of the first opening 120a and the second opening 120b can be arbitrarily changed according to practical requirements.

In some embodiments, the partition 120 may further be provided with a third opening, a fourth opening ... In one embodiment, the additional openings are all located at the fourth The range is 70% ~ 90% in the figure. Openings can be arbitrarily added according to practical needs, and this disclosure is not limited to the above.

The centrifugal fan proposed in this disclosure can provide airflow in different directions by forming a first air outlet and a second air outlet through a casing. A partition is provided between the first air outlet and the rotating shaft of the fan blade rotor, which increases a section of pressurization zone, so that the airflow is more stable in the centrifugal fan. The partition is provided with a first opening and a second opening, and by adjusting the size, position, and shape of the first and second openings, the air volume and airflow smoothness of the first air outlet and the second air outlet can be adjusted. .

This disclosure has been described by examples and the above-mentioned embodiments, and it should be understood that the present invention is not limited to the disclosed embodiments. On the contrary, the present invention encompasses various modifications and approximate arrangements (eg, as would be apparent to one of ordinary skill in the art). Therefore, additional claims should be based on the broadest interpretation to cover all such changes and approximate arrangements.

Claims (8)

A centrifugal fan includes a casing including a top plate, a bottom plate, and a side wall connected between the bottom plate and the top plate, and the top plate, the bottom plate, and the side wall together form a first air outlet and A second air outlet; a partition member disposed in the housing, connected between the bottom plate and the top plate, and separating a first space connected to the first air outlet and a second space in the housing; A second space connected to the air outlet, wherein the partition has a first opening, the first opening communicates with the first space and the second space; and a fan rotor is rotatably disposed in the second space . The centrifugal fan according to claim 1, wherein the side wall has a tongue, and the fan rotor is located between the tongue and the partition. The centrifugal fan according to claim 2, wherein the fan rotor is configured to rotate relative to the casing along a rotation direction based on an axis, and the tongue and a portion of the axis are in a plane perpendicular to the axis. A connection line is defined as a first reference line, and a connection line between an end of the second air outlet far from the tongue and the axis is defined as a second reference line, and a point in the first opening is defined as a connection line with the axis. Is a third reference line, the first reference line to the second reference line is rotated by a first angle along the rotation direction, and the first reference line to the third reference line is rotated by a second angle along the rotation direction , Wherein the second angle is between 70% and 90% of the first angle. In the centrifugal fan according to claim 1, the partition further includes a second opening, and a distance between the second opening and the second air outlet is greater than a distance between the first opening and the second air outlet. The centrifugal fan according to claim 4, wherein the second opening is connected to the side wall. The centrifugal fan according to claim 4, wherein an area of the second opening is smaller than an area of the first opening. The centrifugal fan according to claim 4, wherein a total area of the first opening and the second opening is between 10% and 50% of an area of the second air outlet. The centrifugal fan according to claim 1, wherein the partition has an arc surface, and a center of curvature of the arc surface is located in the second space.