TWM552997U - Centrifugal fan - Google Patents

Abstract

A centrifugal fan includes a housing and a fan wheel. The housing includes a sidewall having a tongue portion. The fan wheel includes a hub and a plurality of blades. The hub is pivotally disposed in the housing. The tongue portion has an inner contour line on a reference plane. Each of the blades has an end surface facing the sidewall. The end surface has an outer contour line on a cross-section. The outer contour lines of any adjacent two of the blades are different. The outer contour line of at least one first blade of the blades and the inner contour line are parallel to each other and form a smallest distance therebetween. The outer contour line of at least one second blade of the blades and the inner contour line are not parallel to each other.

Description

Centrifugal fan

This case is about a centrifugal fan.

When the centrifugal fan is running, the blades will pass through the tongue one by one. When passing through the tongue, the spacing between the blade and the tongue becomes smaller, causing the gas pressure to increase instantaneously. Therefore, the fan blades periodically pass through the tongue to generate audible noise of a specific frequency due to the impact of the airflow. In addition, when the airflow is to leave the tip of the blade, a boundary layer separation of the airflow occurs, and a vortex of the airflow is generated to form a "tip airflow noise".

The present application proposes a centrifugal fan comprising a housing and a fan wheel. The housing contains side walls. The side wall has a tongue portion. The fan wheel contains a hub and a plurality of blades. The hub is pivoted in the housing. The tongue portion has an inner contour on a reference plane. The blade is attached to the outer edge of the hub. Each blade has an end face facing the side wall. The end face has an outer contour on a section. The outlines of any two of the blades are different. At least one of the first blades of the blade has an outline that is parallel to the inner contour. The outer contour of at least one of the second blades of the fan blade is non-parallel to the inner contour line.

This creation also proposes a centrifugal fan that includes a housing and a fan. wheel. The fan wheel contains a hub and a plurality of blades. The hub is pivotally mounted in the housing based on an axis and is configured to rotate in a rotational direction. The fan blades connect the hubs. The end of each blade has at least a first extension and a second extension. The first extension and the second extension are arranged in the direction of the axis. The extending direction of the first extending portion and the second extending portion are different in the rotating direction, and an angular difference is formed therebetween. The angle difference between any two neighbors in the fan blade is different.

In summary, in some embodiments of the centrifugal fan of the present invention, since the contour lines of any two adjacent blades are different, the pressure of each blade and the tongue portion is different, and may be different. The pressure impact strength. There are large and small pressure shocks that can reduce the overall noise energy accumulation, and thus improve the fan blade frequency noise. Furthermore, at least the outer contour of the first blade is parallel to the inner contour of the tongue portion and has a minimum distance, and at least the outer contour of the second blade is non-parallel to the inner contour of the tongue. That is to say, not all blades reduce the pressure, thus reducing the performance loss caused by the conventional design. Moreover, since the contour line outside the second blade has a plurality of outer diameters with respect to the axis, the airflow velocity of each of the height positions of the second blade in the direction of the axis is different from the position of the tip of the blade, so that the airflow vortex is formed. The phenomena are not synchronized, which can effectively alleviate the phenomenon and intensity of the vortex formation and improve the tip airflow noise.

In addition, in other embodiments of the centrifugal fan of the present invention, the end of each blade has an arrangement of a plurality of extensions in the direction of the axis, and the extending direction of the extensions is different in the direction of rotation of the fan wheel, and The angle difference between any two adjacent blades is different. Therefore, by dislocating the airflow distribution position of the blade tip at different height positions, the airflow of different blades at the same radial position can be made. The phenomenon of eddy current formation is not synchronized, and the phenomenon and intensity of vortex formation can be effectively alleviated, and the phenomenon of airflow noise at the tip is improved.

100‧‧‧ centrifugal fan

110‧‧‧shell

111‧‧‧Upper cover

111a‧‧‧Upper vents

112‧‧‧Side wall

112a‧‧‧ tongue mouth

112b‧‧‧Expanding

113‧‧‧Under the cover

113a‧‧‧Air inlet

114‧‧‧air outlet

120‧‧‧fan wheel

121‧‧‧ hub

122‧‧‧ fan leaves

122a‧‧‧ end face

122A‧‧‧First leaf

122B‧‧‧second leaf

220, 320‧‧‧fan wheel

221, 321‧‧ ‧ hub

222, 322‧‧‧ fan leaves

222a, 322a‧‧‧ Body Department

222b, 322b‧‧‧ first extension

222b1, 222c1‧‧‧ end face

222c, 322c‧‧‧ second extension

322d‧‧‧ Third Extension

3-3, 4-4‧‧‧ segments

A‧‧‧ axis

D‧‧‧Minimum distance

L1‧‧‧ inner contour

L2‧‧‧Outer contour

P‧‧‧ reference plane

R‧‧‧Rotation direction

Θ‧‧‧angle difference

The above and other objects, features, advantages and embodiments of the present invention can be more clearly understood. The description of the drawings is as follows: FIG. 1A is a perspective assembled view of a centrifugal fan according to an embodiment of the present invention.

Fig. 1B is a perspective exploded view showing the centrifugal fan in Fig. 1A.

Figure 2 is a top plan view of the centrifugal fan of Figure 1A with the upper cover of the housing removed.

Figure 3 is a partial cross-sectional view showing the structure of Figure 2 along line 3-3.

Fig. 4 is a partial cross-sectional view showing the first blade in Fig. 2 along line 4-4.

5A to 5R are partial cross-sectional views showing the second blade in Fig. 2 in different embodiments.

Fig. 6 is a perspective view showing a fan wheel according to an embodiment of the present invention.

Fig. 7 is a partial top view showing the fan wheel in Fig. 6.

Figure 8 is a perspective view showing a fan wheel of another embodiment of the present invention.

In the following, a plurality of embodiments of the present invention will be disclosed in the drawings, and for the sake of clarity, a number of practical details will be described in the following description. However, it should be understood that these practical details are not applied to limit the case. That is It is said that in the partial implementation of this case, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

Please refer to Figure 1A to Figure 2. FIG. 1A is a perspective assembled view of the centrifugal fan 100 according to an embodiment of the present invention. FIG. 1B is a perspective exploded view showing the centrifugal fan 100 in FIG. 1A. 2 is a top view of the centrifugal fan 100 of FIG. 1A with the upper cover 111 of the housing 110 removed for clarity of the internal structure. As shown in FIGS. 1A to 2 , in the present embodiment, the centrifugal fan 100 includes at least a casing 110 and a fan wheel 120 . The housing 110 includes an upper cover 111, a side wall 112, and a lower cover 113. The side wall 112 and the lower cover 113 are integrally formed, but the present invention is not limited thereto. The side wall 112 has a tongue portion 112a and a flared portion 112b. The fan wheel 120 includes a hub 121 and a plurality of blades 122. The hub 121 is pivotally mounted in the housing 110 based on the axis A. The blade 122 is coupled to the outer edge of the hub 121. The flared portion 112b of the side wall 112 connects the tongue portion 112a and surrounds the fan wheel 120. When the fan wheel 120 rotates, the fan blade 122 can suck the gas outside the casing 110 into the casing 110 from the upper air inlet 111a of the upper cover 111 and the lower air inlet 113a of the lower cover 113, and is gradually separated by the tongue portion 112a. The expanded portion 112b is gradually pressurized, and finally discharged outside the casing 110 by the air outlet 114. The structure, function, and connection relationship between the respective elements will be described in detail below.

Please refer to Figure 3 and Figure 4. Figure 3 is a partial cross-sectional view showing the structure of Figure 2 along line 3-3. Fig. 4 is a partial cross-sectional view showing the first blade 122A in Fig. 2 along the line segment 4-4. As shown in FIGS. 2 to 4, in the present embodiment, a reference plane P can be defined to pass through the tongue portion 112a and the axis A. In Fig. 2, the reference plane P is perpendicular to the plane of Fig. 2 and is associated with line segment 3-3. coincide. The tongue portion 112a has an inner contour line L1 on the reference plane P (see Fig. 3). In some embodiments, the reference plane P may be further defined by the interface between the tongue portion 112a and the diverging portion 112b, but the present invention is not limited thereto.

Each of the blades 122 has an end surface 122a facing the side wall 112. A section (as indicated by line 4-4 in Figure 2) is defined to be parallel to axis A and through end face 122a. The end surface 122a has an outer contour line L2 in cross section (see Fig. 4). In practice, each of the blades 122 can define a longitudinal section that cuts through the entire blade 122 (including the end face 122a) and parallel to the axis A.

In the present embodiment, the contour line L2 (see FIG. 4) of at least one of the first blades 122A of the blade 122 is parallel to the inner contour line L1 of the tongue portion 112a (please refer to FIG. 3). In the present embodiment, the outer contour line L2 of the first blade 122A and the inner contour line L1 of the tongue portion 112a are perpendicular to the lower cover 113. However, the present invention is not limited thereto and can be elastically adjusted according to requirements. In addition, when the first blade 122A moves to intersect the end surface 122a with the reference plane P (as shown in FIG. 2), the end surface 122a and the inner contour line L1 have a minimum distance D (as shown in FIG. 3). .

Please refer to FIG. 5A to FIG. 5R , which are partial cross-sectional views of the second blade 122B in FIG. 2 in different embodiments. As shown in FIG. 2 and FIGS. 5A to 5R, in the present embodiment, at least one of the second blades 122B of the blade 122 has an outline L2 (refer to FIGS. 5A to 5R). One) is not parallel to the inner contour line L1 of the tongue portion 112a (please refer to FIG. 3).

In the present embodiment, the contour lines L2 of the two adjacent blades 122 are different. According to the foregoing configuration, the pressure of each of the blades 122 and the tongue portion 112a can be different, and different pressure impact strengths can be generated. The overall noise energy accumulation decreases, which in turn improves the fan blade frequency noise. Since there is at least one first blade 122A, the contour line L2 is parallel to the inner contour line L1 of the tongue portion 112a and has a minimum distance D, and there is at least one second blade 122B outside the contour line L2 and the tongue opening. The contour line L1 is non-parallel, thus reducing the performance loss caused by the general design. Since the outline L2 of the second blade 122B has a plurality of outer diameters with respect to the axis A, the airflow speed of the second blade 122B at each height position in the direction of the axis A and the position away from the tip end of the blade 122 are different, so that The phenomenon of the vortex flow is not synchronized, which can effectively alleviate the phenomenon and intensity of the vortex formation and improve the tip airflow noise.

As shown in FIGS. 5A to 5R, the outer contour line L2 of the second blade 122B of any outer shape has a plurality of outer diameters with respect to the axis A (please refer to FIG. 2). The outer diameter of the outline L2 outside the second blade 122B shown in FIGS. 5A to 5I is gradually changed in the direction of the axis A. In some embodiments, the outer diameter of the outer contour line L2 is increased from the upper edge of the outer contour line L2 toward the lower edge of the outer contour line L2. In other embodiments, the outer diameter of the outer contour line L2 is tapered from the upper edge of the outer contour line L2 toward the lower edge of the outer contour line L2. The outer diameter of the outline L2 outside the second blade 122B shown in FIGS. 5J to 5P is stepwise in the direction of the axis A. The outer diameter of the outline L2 outside the second blade 122B shown in the 5th and 5th views is partially gradually changed and partially stepped in the direction of the axis A.

In some embodiments, the fan wheel 120 can include a plurality of the aforementioned first blades 122A, and the first blades 122A are periodically annularly arranged in all of the blades 122. In some embodiments, the fan wheel 120 may include a plurality of the same outer shape second blade 122B (please refer to any of the 5A to 5R drawings), and The two blades 122B are periodically annularly arranged in all of the blades 122.

In some embodiments, any three of the blades 122 are different in outline line L2. In one embodiment, the fan blade 122 included in the fan wheel 120 may be the first blade 122A shown in FIG. 4, the second blade 122B shown in FIG. 5A, and the second blade shown in FIG. 5B. The 122B is periodically arranged in a ring shape, but the case is not limited thereto. In practical applications, the fan blades 122 included in the fan wheel 120 may also be formed by periodically arranging a plurality of first blades 122A between the second blades 122B of different types.

Please refer to Figure 6 and Figure 7. FIG. 6 is a perspective view showing the fan wheel 220 according to an embodiment of the present invention. Fig. 7 is a partial top view showing the fan wheel 220 in Fig. 6. As shown in FIGS. 6 and 7, the fan wheel 220 of the present embodiment can replace the fan wheel 120 shown in FIG. 1B, and the fan wheel 220 includes a hub 221 and a plurality of blades 222. The hub 221 is pivotally disposed in the housing 110 based on the axis A and is configured to rotate in a rotational direction R. The blade 222 is coupled to the outer edge of the hub 221.

Each blade 222 includes a body portion 222a, a first extension portion 222b, and a second extension portion 222c. In a radial direction perpendicular to the axis A, one end of the body portion 222a is coupled to the hub 221, and the other end of the body portion 222a is coupled to the corresponding first extension portion 222b and second extension portion 222c. The first extension portion 222b and the second extension portion 222c are arranged in the direction of the axis A. Further, the extending direction of the first extending portion 222b and the second extending portion 222c are different in the rotational direction R, and an angular difference θ is formed therebetween.

In the present embodiment, the angular difference θ of any two adjacent blades 222 is different. By the aforementioned structural configuration (that is, by dislocating the airflow distribution positions at the tips of the blades 222 at different height positions), the different blades 222 can be made the same The phenomenon of the vortex flow in the radial position is not synchronized, and the strength of the vortex formation of the airflow can be reduced, and the phenomenon of the airflow noise of the fan blade 222 can be changed.

In some embodiments, the body portion 222a on the same blade 222 is parallel to the first extension 222b. In some embodiments, the second extension 222c is offset from the first extension 222b in the direction of rotation R. In some other embodiments, the second extension portion 222c is offset from the first extension portion 222b in a direction opposite to the rotation direction R.

In some embodiments, the first extension portion 222b and the second extension portion 222c each have an end surface 222b1, 222c1 away from the hub 221, and the end surfaces 222b1, 222c1 have the same outer diameter with respect to the axis A.

In some embodiments, the first extending portion 222b of each of the groups of the fans 322 forms the same angular difference θ with the extending direction of the second extending portion 222c, and the group periodically rings Arranged in all of the blades 322.

Please refer to FIG. 8 , which is a perspective view of a fan wheel 320 according to another embodiment of the present invention. As shown in FIG. 8, the fan wheel 320 of the present embodiment may also replace the fan wheel 120 shown in FIG. 1B, and the fan wheel 320 includes a hub 321 and a plurality of blades 322. The hub 321 is pivotally disposed in the housing 110 based on the axis A and is configured to rotate in a rotational direction R. The blade 322 is coupled to the outer edge of the hub 321 .

Some of the blades 322 of the fan wheel 320 each include a body portion 322a, a first extension portion 322b, a second extension portion 322c, and a third extension portion 322d. In a radial direction perpendicular to the axis A, one end of the body portion 322a is coupled to the hub 321 and the other end of the body portion 322a is coupled to the corresponding first extension portion 322b, second extension portion 322c and third extension portion 322d. First extension portion 322b, second extension The extension 322c and the third extension 322d are arranged in the direction of the axis A. The extending direction of any two adjacent ones of the first extending portion 322b, the second extending portion 322c, and the third extending portion 322d is different in the rotational direction R, and forms an angular difference θ therebetween.

In one embodiment, the body portion 322a on the same blade 322 is parallel to the first extension portion 322b, and the second extension portion 322c is offset from the first extension portion 322b in the rotation direction R, and the third extension portion 322d The first extension portion 322b is offset from the rotation direction R, but the present invention is not limited thereto.

In some embodiments, the first extension portion 322b, the second extension portion 322c, and the third extension portion 322d each have an end surface away from the hub 321 and the end surfaces have the same outer diameter with respect to the axis A.

In some embodiments, the first extending portion 322b is arranged between the second extending portion 322c and the third extending portion 322d in the direction of the axis A, but the present invention is not limited thereto. In practical applications, the order of arrangement of the first extension portion 322b, the second extension portion 322c, and the third extension portion 322d of any two adjacent blades 322 in the direction of the axis A may be different.

In some embodiments, the fan wheel 320 also includes at least one blade 222 as shown in FIG. That is, the fan wheel 320 can include both a blade 222 having two extensions and a blade 322 having three extensions. In practical applications, the number of extensions included in the blade 322 can be elastically increased or decreased as desired.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present case. Anyone skilled in the art can make various changes and refinements without departing from the spirit and scope of the present case. The scope defined in the attached patent application shall prevail.

100‧‧‧ centrifugal fan

110‧‧‧shell

111‧‧‧Upper cover

111a‧‧‧Upper vents

112‧‧‧Side wall

112a‧‧‧ tongue mouth

112b‧‧‧Expanding

113‧‧‧Under the cover

113a‧‧‧Air inlet

120‧‧‧fan wheel

121‧‧‧ hub

122‧‧‧ fan leaves

122a‧‧‧ end face

122A‧‧‧First leaf

122B‧‧‧second leaf

A‧‧‧ axis

Claims (15)

A centrifugal fan includes: a casing including a side wall having a tongue portion; and a wheel comprising: a hub pivotally disposed in the casing, the tongue portion being The reference plane has an inner contour line; and a plurality of blades are connected to the hub, each of the blades having an end surface facing the side wall, the end surface having an outer contour on a section, wherein the fans The outer contours of any two adjacent ones of the leaves are different, and the outer contour of at least one of the first blades is parallel to the inner contour, and at least one of the blades The outer contour of the second blade is non-parallel to the inner contour. The centrifugal fan of claim 1, wherein when the at least one first blade moves to intersect the corresponding end face with the reference plane, the corresponding end face has a minimum distance from the inner contour. The centrifugal fan of claim 1, wherein the hub is pivotally mounted in the housing based on an axis, and the outer contour of the at least one second blade has a plurality of outer diameters relative to the axis . The centrifugal fan of claim 3, wherein the outer diameters of the outer contours of the at least one second blade are gradually increased from an upper edge of the outer contour toward a lower edge of the outer contour. The centrifugal fan of claim 3, wherein the outer diameters of the outer contours of the at least one second blade are gradually decreased from an upper edge of the outer contour toward a lower edge of the outer contour. The centrifugal fan of claim 3, wherein the outer diameters of the outer contours of the at least one second blade are stepwise changed in the direction of the axis. The centrifugal fan of claim 1, wherein the number of the at least one first blade is a plurality, and the first blades are periodically annularly arranged in all of the blades. The centrifugal fan of claim 1, wherein the number of the at least one second blade is a plurality, and the second blades are periodically annularly arranged in all of the blades. The centrifugal fan of claim 1, wherein the outer contours of any one of the three blades are different. A centrifugal fan comprising: a casing; and a fan wheel comprising: a hub pivoted in the housing based on an axis and configured to rotate in a rotational direction; and a plurality of blades, connected The hub, the end of each of the blades At least one first extending portion and one second extending portion, wherein the first extending portion and the second extending portion are arranged in the direction of the axis, and the extending direction of the first extending portion and the second extending portion are The directions of rotation are different and form an angular difference therebetween, wherein the angular differences of any two of the blades are different. The centrifugal fan of claim 10, wherein each of the blades further comprises a body portion, the one end of the body portion is connected to the hub in a radial direction perpendicular to one of the axes, the body portion The other end is connected to the first extension portion and the second extension portion, and the body portion is parallel to the corresponding first extension portion. The centrifugal fan of claim 10, wherein the second extension is offset with respect to the first extension in the direction of rotation. The centrifugal fan of claim 10, wherein the second extension is offset from the first extension in a direction opposite to the direction of rotation. The centrifugal fan of claim 10, wherein the first extension and the second extension end each have an end face away from the hub, and the end faces have the same outer diameter with respect to the axis. The centrifugal fan of claim 10, wherein the first extension of each of the one of the plurality of blades forms the same angular difference between the extension of the second extension and the extension of the second extension And the group is periodic The ground ring is arranged in all of the blades.