TWI724872B - Centrifugal impeller and centrifugal fan including the same - Google Patents

Abstract

A centrifugal impeller and a centrifugal fan including the same are provided to overcome the difficulty in further reducing the noise of the conventional centrifugal fan. The centrifugal impeller includes a hub, an extension disc connected to the hub, a plurality of blades annularly mounted to the outer periphery of the hub and having bottom edges connected to the extension disc, and an air-guiding cover connected to the top edges of the plurality of blades and having an air inlet edge enclosing and delimiting an air inlet. An air outlet edge of the air-guiding cover is separated from the outer edge of the extension disc by a plurality of blades to form a plurality of air outlets. At least one notch forms on the inner face of the air-guiding cover between each two adjacent blades, and extends from the air outlet towards the air inlet. The width of the notch gradually reduces from the air outlet towards the air inlet.

Description

Centrifugal fan wheel and centrifugal fan with the centrifugal fan wheel

The invention relates to a fan wheel and a fan with the fan wheel, in particular to a centrifugal fan wheel that can reduce operating noise and improve fan efficiency and a centrifugal fan with the centrifugal fan wheel.

Please refer to FIG. 1, which is a conventional centrifugal fan wheel 9. The conventional centrifugal fan wheel 9 has a hub 91, an extension plate 92, several fan blades 93 and a wind guide cover 94. The extension disk 92 is connected to the hub 91, and the plurality of fan blades 93 are connected to the extension disk 92 and the air guide cover 94. An embodiment similar to the conventional centrifugal fan 9 has been disclosed in the Republic of China Patent Publication No. I653397.

Although the conventional centrifugal fan wheel 9 has better airflow guiding smoothness and lower operating noise than the traditional centrifugal fan wheel, the air guide cover 94 basically presents a shape of uniform plate thickness, and Both the inner and outer surfaces are flat, so the structural strength is low, and there is still room for improvement in operating noise.

In order to solve the above problems, the purpose of the present invention is to provide a centrifugal fan wheel and a centrifugal fan, which can further improve the smoothness of the air flow, so as to achieve the effect of reducing operating noise without reducing the air volume.

The second objective of the present invention is to provide a centrifugal fan wheel and a centrifugal fan, which can improve the structural strength of the wind guide cover.

Another object of the present invention is to provide a centrifugal fan wheel and a centrifugal fan, which can further improve the performance and efficiency of the fan.

Another object of the present invention is to provide a centrifugal fan wheel and a centrifugal fan, which can improve the molding yield.

The directionality described in the full text of the present invention or its similar terms, such as "front", "rear", "left", "right", "up (top)", "down (bottom)", "inner", "outer" , "Side", etc., mainly refer to the directions of the attached drawings, and the terms of directionality or similar terms are only used to assist in the description and understanding of the embodiments of the present invention, and are not intended to limit the present invention.

The elements and components described in the full text of the present invention use the quantifiers "one" or "one" for convenience and to provide the general meaning of the scope of the present invention; in the present invention, it should be construed as including one or at least one, and single The concept of also includes the plural, unless it clearly implies other meanings.

Approximate terms such as "combination", "combination" or "assembly" mentioned in the full text of the present invention mainly include the types that can be separated without destroying the components after being connected, or the components cannot be separated after being connected, which are common knowledge in the field Those can be selected based on the materials of the components to be connected or assembly requirements.

The centrifugal fan wheel of the present invention includes: a hub; an extension disk connected to the hub; a plurality of fan blades arranged around the outer circumference of the hub, and the bottom edge of the plurality of fan blades is connected to the extension disk; and a wind guide The cover is connected to the top edges of the several fan blades, the air inlet edge of the air guiding cover forms an air inlet, and the air outlet edge of the air guiding cover and the outer edge of the extension plate are formed by the several fan blades Several air outlets are separated, the inner surface of the air guide cover has at least one groove between any two adjacent blades, the groove extends from the air outlet to the air inlet, and the groove width of the groove is determined by The air outlet decreases toward the air inlet, the groove has an inner end and an outer end, the inner end of the groove is located between the air inlet and outlet edges of the air guide cover, and the outer end of the groove is located On the air outlet edge of the air guide cover, the groove width of the groove decreases from the outer end to the inner end, and the concave Two side edges of the groove are respectively connected to the inner end and the outer end, and the two side edges respectively extend linearly from the inner end to the outer end.

The centrifugal fan wheel of the present invention includes: a hub; an extension disk connected to the hub; a plurality of fan blades arranged around the outer circumference of the hub, and the bottom edge of the plurality of fan blades is connected to the extension disk; and a wind guide The cover is connected to the top edges of the several fan blades, the air inlet edge of the air guiding cover forms an air inlet, and the air outlet edge of the air guiding cover and the outer edge of the extension plate are formed by the several fan blades Several air outlets are separated, the inner surface of the air guide cover has at least one groove between any two adjacent blades, the groove extends from the air outlet to the air inlet, and the groove width of the groove is determined by The air outlet decreases toward the air inlet, the groove has an inner end and an outer end, the inner end of the groove is located between the air inlet and outlet edges of the air guide cover, and the outer end of the groove is located The air outlet edge of the air guide cover, the air inlet edge and the air outlet edge of the air guide cover have a radial distance, the air outlet forms a front side and a rear side according to the rotation direction, and the groove is closer to the front side of the air outlet There is a straight line distance from the inner end to the outer end of the side, and the straight line distance is 0.8 to 2 times the radial distance.

The centrifugal fan wheel of the present invention includes: a hub; an extension disk connected to the hub; a plurality of fan blades arranged around the outer circumference of the hub, and the bottom edge of the plurality of fan blades is connected to the extension disk; and a wind guide The cover is connected to the top edges of the several fan blades, the air inlet edge of the air guiding cover forms an air inlet, and the air outlet edge of the air guiding cover and the outer edge of the extension plate are formed by the several fan blades Several air outlets are separated, the inner surface of the air guide cover has at least one groove between any two adjacent blades, the groove extends from the air outlet to the air inlet, and the groove width of the groove is determined by The air outlet decreases toward the air inlet, and the width of the air outlet is 2-8 times the groove width of the groove at the air outlet.

The centrifugal fan wheel of the present invention includes: a hub; an extension disk connected to the hub; a plurality of fan blades arranged around the outer circumference of the hub, and the bottom edge of the plurality of fan blades is connected to the extension disk; and a wind guide The cover is connected to the top edges of the several fan blades, the air inlet edge of the air guiding cover forms an air inlet, and the air outlet edge of the air guiding cover and the outer edge of the extension plate are formed by the several fan blades Separate several air outlets, the guide The inner surface of the wind cover has at least one groove between any two adjacent blades, the groove extends from the air outlet to the air inlet, and the groove width of the groove decreases from the air outlet to the air inlet, The air outlet forms a front side and a rear side according to the rotation direction, and the width from the side of the groove closest to the front side to the front side is 1 to 3 times the groove width of the groove at the air outlet.

The centrifugal fan wheel of the present invention includes: a hub; an extension disk connected to the hub; a plurality of fan blades arranged around the outer circumference of the hub, and the bottom edge of the plurality of fan blades is connected to the extension disk; and a wind guide The cover is connected to the top edges of the several fan blades, the air inlet edge of the air guiding cover forms an air inlet, and the air outlet edge of the air guiding cover and the outer edge of the extension plate are formed by the several fan blades Several air outlets are separated, the inner surface of the air guide cover has at least one groove between any two adjacent blades, the groove extends from the air outlet to the air inlet, and the groove width of the groove is determined by The air outlet decreases gradually toward the air inlet, and each air outlet forms a front side and a rear side according to the rotation direction, and the height of each air outlet at least partially decreases from the front side to the rear side of the same air outlet.

The centrifugal fan of the present invention includes: a base having a shaft connection part; a stator located on the outer periphery of the shaft connection part; and a centrifugal fan wheel as described above, the hub is connected with a rotating shaft, and the rotating shaft is rotatably arranged At the shaft connection part, a magnetic member is located on the outer circumference of the rotating shaft and opposite to the stator.

Accordingly, the centrifugal fan wheel and the centrifugal fan of the present invention can improve the smoothness of the guided air flow by designing the shape of the inner surface of the air guide cover, thus not only can further improve the performance and efficiency of the fan, but also reduce Functions such as operating noise. At the same time, the structural strength of the air guide cover is also improved, so that the air guide cover is less likely to be deformed during molding or operation, and has the effects of improving product yield.

Wherein, the inner surface of the air guide cover may have an arc guide portion corresponding to each of the air outlets, the arc guide portion may be adjacent to the rear side of the air outlet, the arc guide portion has a peak, and each air outlet is not provided with the The height of the groove may increase from the peak point to the front side of the air outlet, and may increase from the peak point to the rear side of the air outlet. In this way, the airflow can be led out more smoothly, and has the effect of further reducing operating noise.

Wherein, the outer surface of the wind guide cover may have a recessed portion opposite to the arc guide portion. In this way, it has the effects of improving the structural strength of the air guide cover and the forming yield.

Wherein, the number of grooves located between any two adjacent blades can be more than two. In this way, it has more obvious effects such as improving the smoothness of diversion and reducing noise.

Wherein, for several grooves located in the same air outlet range, the groove width at the air outlet may be the same. In this way, it has more obvious effects such as improving the smoothness of diversion and reducing noise.

Wherein, the inner surface of the wind guide cover may have at least one protruding portion adjacent to the side of the groove, and the outer surface of the wind guide cover may have at least one recessed portion, and the recessed portion may be opposite to the protruding portion. In this way, it has the effects of improving the structural strength of the air guide cover and the forming yield.

Wherein, the wind guide cover may have a flange, and the flange may be connected to the air outlet edge of the wind guide cover. In this way, the structural strength of the air guide cover can be improved, and the air outlets are not easily deformed.

〔this invention〕

1: Wheel hub

11: Disc body

12: Ring wall

2: Extension plate

2a: inner edge

2b: Outer edge

21: The first surface

22: second surface

3: fan blade

3a: bottom edge

3b: Top edge

4: Air guide cover

4a: Into the wind edge

4b: Out of the wind

41: inner surface

42: outer surface

43: Groove

431: Inner End

432: Outer End

433: side

44: Depressed part

45: arc guide

451: Peak Point

46: flange

5: shaft

6: Magnetic parts

7: Pedestal

7a: Positioning shell

7b: bottom shell

71: Shaft joint

72: Bearing

8: stator

D1: Radial spacing

D2: straight line distance

E1: Front side

E2: Rear side

F: Centrifugal fan wheel

H: height

P: Protruding part

S: Assembly space

T1: Air inlet

T2: Air outlet

W1: groove width

W2, W3: width

[Traditional]

9: Centrifugal fan wheel

91: wheel hub

92: Extension plate

93: fan blade

94: Air guide cover

[Figure 1] A diagram of a conventional centrifugal fan.

[Figure 2] A perspective view of a preferred embodiment of the present invention.

[Figure 3] A cross-sectional view along the line A-A in Figure 2.

[Figure 4] A cross-sectional view along the line B-B in Figure 3.

[Figure 5] A cross-sectional view along the line C-C in Figure 3.

[Figure 6] A side cross-sectional view of a centrifugal fan according to a preferred embodiment of the present invention.

[Figure 7] A comparison diagram of air volume, pressure and efficiency between the preferred embodiment of the present invention and the conventional centrifugal fan wheel.

In order to make the above and other objects, features and advantages of the present invention more comprehensible and understandable, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings: Please refer to Figure 2. It is the first embodiment of the centrifugal fan F of the present invention. It includes a hub 1, an extension disk 2, a plurality of fan blades 3, and a wind guide cover 4. The extension disk 2 is connected to the hub 1, and the plurality of fans The blade 3 connects the extension plate 2 and the wind guide cover 4.

Please refer to Figures 2 and 3, the present invention does not limit the shape of the hub 1; in this embodiment, the hub 1 may have a disc body 11 and a ring wall 12, and the ring wall 12 is connected to the disc body 11. The periphery, and is axially extending.

The extension disk 2 may be ring-shaped and have an inner edge 2a and an outer edge 2b. The inner edge 2a of the extension disk 2 may be directly or indirectly connected to the ring wall 12 of the hub 1. The extension plate 2 has a first surface 21 and a second surface 22 opposite to each other. The extension plate 2 can have a higher center and a lower outer edge, so that the inner edge 2a of the extension plate 2 can be higher than the Extend the outer edge 2b of the disk 2 and surround the first surface 21 to form an assembly space S located below the hub 1.

The plurality of fan blades 3 are arranged around the outer circumference of the hub 1, and each of the fan blades 3 has a bottom edge 3a and a top edge 3b opposite to each other. The bottom edges 3a of the plurality of fan blades 3 can be connected to the extension plate 2 The second surface 22 and the partial top edges 3b of the plurality of fan blades 3 can be connected to the air guide cover 4.

The wind guide cover 4 may have an inner surface 41 and an outer surface 42 opposite to each other, and the wind guide cover 4 may be connected to the top edges 3 b of the plurality of fan blades 3 by the inner surface 41. The air inlet edge 4a of the air guide cover 4 can enclose an air inlet T1, and the air outlet edge 4b of the air guide cover 4 and the outer edge 2b of the extension plate 2 can be separated by the plurality of fan blades 3 Out of several air outlets T2. In this way, the airflow can flow in from the air inlet T1, and flow out from the air outlets T2 through the guidance of the plurality of fan blades 3, forming a centrifugal diversion mode of shaft inlet side outlet.

Please refer to Figures 2 and 4, the inner surface 41 of the air guide cover 4 can be non-planar, and can have different distances from the second surface 22 of the extension plate 2 at different positions, that is, the air outlet T2 The height H everywhere can be non-uniform. Wherein, each of the air outlets T2 may form a front side E1 and a rear side E2 according to the direction of rotation, and the height H of each of the air outlets T2 is at least partially in a state of decreasing from the front side E1 of the same air outlet T2 to the rear side E2, so as to Produce the effect of increasing the wind speed.

Please refer to Figures 2 and 5, the inner surface 41 of the wind guide cover 4 may also have at least one groove 43 between any two adjacent fan blades 3 to help reduce operating noise. In detail, the groove 43 may have an inner end 431 and an outer end 432, and two side edges 433 of the groove 43 are connected to the inner end 431 and the outer end 432, respectively. The inner end 431 of the groove 43 may be located between the air inlet edge 4 a and the air outlet edge 4 b of the air guiding cover 4, and the outer end 432 of the groove 43 may be located at the air outlet edge 4 b of the air guiding cover 4. The groove 43 may extend from the air outlet T2 to the air inlet T1, and the groove width W1 of the groove 43 may decrease from the air outlet T2 to the air inlet T1; that is, the groove 43 may only partially Form a pattern with an outer width and an inner narrow, or as shown in the drawings of this embodiment, the groove width W1 of the groove 43 is continuously reduced from the outer end 432 to the inner end 431, so that the groove width W1 of the groove 43 The widest can be formed at the air outlet T2.

In addition, the air inlet edge 4a and the air outlet edge 4b of the air guide cover 4 have a radial distance D1, and the groove 43 is closer to the side 433 of the front side E1 of the air outlet T2 from the inner end 431 to the outer end 432. It has a straight line distance D2, which is about 0.8 to 2 times the radial distance D1, so that the groove 43 can have an appropriate length. In addition, the width W2 of the air outlet T2 is approximately 2-8 times the groove width W1 of the groove 43 at the air outlet T2, so that the groove 43 can have an appropriate width at the air outlet T2. The width W3 from the side 433 of the groove 43 closest to the front side E1 of the air outlet T2 to the front side E1 is about 1 to 3 times the groove width W1 of the groove 43 at the air outlet T2, so that the groove 43 Can be set in the appropriate position.

In addition, the two sides 433 of the groove 43 can extend linearly from the inner end 431 to the outer end 432, or the portion extending linearly from the inner end 431 to the outer end 432 is at least more than half of the aforementioned linear distance D2. , In order to improve the smoothness of diversion. The number of grooves 43 located between any two adjacent blades 3 can be more than two (including two) to achieve a better noise reduction effect. Among them, the number of grooves 43 located in the range of different air outlets T2 can be the same or different, and the number of grooves 43 located in the range of the same air outlet T2 can be the same or different. For several grooves 43, the groove width W1 at the air outlet T2 can be selected to be the same.

Please refer to Figures 2 and 4 again, the inner surface 41 of the wind guide cover 4 may have at least one protrusion P adjacent to the side 433 of the groove 43; the outer surface 42 of the wind guide cover 4 may have At least one concave portion 44, and the concave portion 44 is located opposite to the protruding portion P. With the provision of the recessed portion 44, not only the structural strength of the wind guide cover 4 can be improved and it is not easy to deform, but also for the wind guide cover 4 made by the injection molding method, the wind guide cover 4 can be formed. The thickness of the protrusion P is similar to that of other adjacent parts, so that it has a similar cooling and solidification speed, which can avoid deformation caused by too much difference in cooling and solidification speeds, and can reduce the material forming the protrusion P Volume, thereby reducing manufacturing costs.

In addition, the inner surface 41 of the air guide cover 4 can also have an arc guide portion 45 corresponding to each air outlet T2, and the arc guide portion 45 can be adjacent to the rear side E2 of the air outlet T2, so that the airflow can be smoothly led out, and further To reduce operating noise. Wherein, the arc surface formed by the arc guide portion 45 may have a peak point 451, and the peak point 451 is closest to the second surface 22 of the extension plate 2; the height of each air outlet T2 where the groove 43 is not provided H can increase from the peak point 451 to the front side E1 of the air outlet T2, and from the peak point 451 to the rear side E2 of the air outlet T2. Moreover, since the arc guide portion 45 is closer to the rear side E2 of the air outlet T2, the arc guide portion 45 can also be formed into a convex shape, so it is better to align the arc guide portion on the outer surface 42 of the wind guide cover 4 45 is provided with the aforementioned recess 44. The wind guide cover 4 may additionally have a flange 46 connected to and protrudes from the outer surface 42 of the wind guide cover 4, and the flange 46 can preferably be connected to the air outlet edge 4b of the wind guide cover 4 In order to improve the structural strength of the air guide cover 4, it helps to maintain the air outlets T2 not easily deformed.

Please refer to Figures 2 and 6, according to the foregoing structure, the centrifugal fan F of this embodiment can be connected to a rotating shaft 5 by the disc body 11 of the hub 1, and has a magnetic member 6 located on the outer periphery of the rotating shaft 5. The magnetic member 6 can be directly or indirectly coupled to the ring wall 12 of the hub 1, for example; in addition, a base 7 and stator 8 can be combined to form a centrifugal fan.

In detail, the base 7 may have a positioning shell 7a and a bottom shell 7b. The positioning shell 7a may be injected to cover the stator 8, provide necessary insulation, and form a shaft joint 71 for assembling at least one Bearing 72, the rotating shaft 5 is rotatably disposed on the bearing 72, the stator 8 can be located on the outer circumference of the shaft connecting portion 71, and the magnetic member 6 can be opposite to the stator 8 to sense magnetism. The bottom shell 7b can be assembled and combined under the positioning shell 7a, and is substantially located in the assembly space S of the extension tray 2. In this way, when the stator 8 is energized to generate a magnetic field to drive the centrifugal fan wheel F to rotate, the airflow flowing in from the air inlet T1 can be affected by the groove of the air guide cover 4 when passing between the plurality of fan blades 3 43. The protruding part P or the arc guide part 45 enhances the smoothness of the air flow so as to flow out from the several air outlets T2 more smoothly, so that the operating noise of the centrifugal fan reaches a good standard.

In order to prove the above effect, the present invention adopts the centrifugal fan wheel F of the aforementioned preferred embodiment, and the conventional centrifugal fan wheel as shown in Fig. 1, only the fan wheel type is used as the variable factor, and the air volume, wind pressure, Testing of fan efficiency and operating noise. It can be seen from FIG. 7 that the performance and efficiency of the centrifugal fan F of the preferred embodiment of the present invention are further improved compared with the fan of the conventional centrifugal fan. In addition, in terms of noise experiment, when the operating noise of the centrifugal fan wheel F of the preferred embodiment of the present invention and the conventional centrifugal fan wheel reach about 82dBA, the air volume and pressure of the centrifugal fan wheel F of the preferred embodiment of the present invention And the fan efficiency is higher than the conventional centrifugal fan wheel; therefore, under the same fan performance and efficiency requirements, the centrifugal fan wheel F of the preferred embodiment of the present invention can obviously achieve the effect of reducing operating noise.

In summary, the centrifugal fan wheel and the centrifugal fan of the present invention can improve the smoothness of the guided air flow by designing the shape of the inner surface of the air guide cover, thus not only can further improve the performance and efficiency of the fan, but also To achieve the effect of reducing operating noise. At the same time, the structural strength of the air guide cover is also improved, so that the air guide cover is less likely to be deformed during molding or operation, and has the effects of improving product yield.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art without departing from the spirit and scope of the present invention may make various changes and modifications relative to the above-mentioned embodiments. The technical scope of the invention is protected. Therefore, the scope of protection of the invention shall be subject to the scope of the attached patent application.

1: Wheel hub

11: Disc body

12: Ring wall

2: Extension plate

2b: Outer edge

21: The first surface

22: second surface

3: fan blade

3a: bottom edge

3b: Top edge

4: Air guide cover

4a: Into the wind edge

4b: Out of the wind

41: inner surface

42: outer surface

43: Groove

432: Outer End

433: side

44: Depressed part

45: arc guide

46: flange

5: shaft

E1: Front side

E2: Rear side

F: Centrifugal fan wheel

H: height

P: Protruding part

T1: Air inlet

T2: Air outlet

Claims (12)

A centrifugal fan wheel, comprising: a hub; an extension disk connected to the hub; a plurality of fan blades arranged around the outer circumference of the hub, and the bottom edge of the plurality of fan blades is connected to the extension disk; and a wind guide cover, Connecting the top edges of the plurality of fan blades, the air inlet edge of the air guiding cover forms an air inlet, and the air outlet edge of the air guiding cover and the outer edge of the extension plate are separated by the plurality of fan blades Several air outlets, the inner surface of the air guide cover has at least one groove between any two adjacent blades, the groove extends from the air outlet to the air inlet, and the groove width of the groove is determined by the outlet The air outlet decreases toward the air inlet, the groove has an inner end and an outer end, the inner end of the groove is located between the air inlet and outlet edges of the air guide cover, and the outer end of the groove is located on the guide At the air outlet edge of the wind cover, the groove width of the groove decreases from the outer end to the inner end. Two sides of the groove are connected to the inner end and the outer end, and the two sides extend from the inner end. Extend in a straight line to the outer end. A centrifugal fan wheel, comprising: a hub; an extension disk connected to the hub; a plurality of fan blades arranged around the outer circumference of the hub, and the bottom edge of the plurality of fan blades is connected to the extension disk; and a wind guide cover, Connecting the top edges of the plurality of fan blades, the air inlet edge of the air guiding cover forms an air inlet, and the air outlet edge of the air guiding cover and the outer edge of the extension plate are separated by the plurality of fan blades Several air outlets, the inner surface of the air guide cover has at least one groove between any two adjacent blades, the groove extends from the air outlet to the air inlet, and the groove width of the groove is determined by the outlet The air outlet decreases toward the air inlet. The groove has an inner end and an outer end. The air outlet edge of the wind cover has a radial distance between the air inlet edge and the air outlet edge of the air guide cover. The air outlet forms a front side and a rear side according to the rotation direction. The side edge of the side has a straight line distance from the inner end to the outer end, and the straight line distance is 0.8 to 2 times the radial distance. A centrifugal fan wheel, comprising: a hub; an extension disk connected to the hub; a plurality of fan blades arranged around the outer circumference of the hub, and the bottom edge of the plurality of fan blades is connected to the extension disk; and a wind guide cover, Connecting the top edges of the plurality of fan blades, the air inlet edge of the air guiding cover forms an air inlet, and the air outlet edge of the air guiding cover and the outer edge of the extension plate are separated by the plurality of fan blades Several air outlets, the inner surface of the air guide cover has at least one groove between any two adjacent blades, the groove extends from the air outlet to the air inlet, and the groove width of the groove is determined by the outlet The air outlet decreases toward the air inlet, and the width of the air outlet is 2-8 times the groove width of the groove at the air outlet. A centrifugal fan wheel, comprising: a hub; an extension disk connected to the hub; a plurality of fan blades arranged around the outer circumference of the hub, and the bottom edge of the plurality of fan blades is connected to the extension disk; and a wind guide cover, Connecting the top edges of the plurality of fan blades, the air inlet edge of the air guide cover forms an air inlet, and the air outlet edge of the air guide cover and the outer edge of the extension plate are separated by the plurality of fan blades A plurality of air outlets, the inner surface of the air guide cover has at least one groove between any two adjacent blades, the groove extends from the air outlet to the air inlet, and the groove width of the groove is determined by the outlet The air outlet decreases toward the air inlet, and the air outlet forms a front side and a rear side according to the direction of rotation. The width from the side of the groove closest to the front side to the front side is 1 of the groove width of the groove at the air outlet. ~3 times. A centrifugal fan wheel, comprising: a hub; an extension disk connected to the hub; Several fan blades are arranged around the outer circumference of the hub, and the bottom edge of the several fan blades is connected to the extension plate; and a wind guide cover is connected to the top edge of the several fan blades, and the air inlet edge of the wind guide cover The enclosure forms an air inlet, the air outlet edge of the air guide cover and the outer edge of the extension plate are separated by the plurality of fan blades, and the inner surface of the air guide cover is on any two adjacent blades There is at least one groove therebetween, the groove extends from the air outlet to the air inlet, and the groove width of the groove decreases from the air outlet to the air inlet, and each air outlet forms a front side and On the rear side, at least part of the height of each air outlet decreases gradually from the front side to the rear side of the same air outlet. For example, the centrifugal fan wheel of claim 5, wherein the inner surface of the air guide cover has an arc guide portion corresponding to each of the air outlets, the arc guide portion is adjacent to the rear side of the air outlet, the arc guide portion has a peak point, and each The height of the air outlet where the groove is not provided increases from the peak point to the front side of the air outlet, and from the peak point to the rear side of the air outlet. For example, the centrifugal fan wheel of claim 6, wherein the outer surface of the wind guide cover has a concave portion opposite to the arc guide portion. Such as the centrifugal fan wheel of claim 1, wherein the number of grooves located between any two adjacent fan blades is two or more. Such as the centrifugal fan wheel of claim 8, wherein the groove width at the air outlet is the same for several grooves located in the same air outlet range. For example, the centrifugal fan wheel of claim 1, wherein the inner surface of the wind guide cover has at least one protruding part adjacent to the side of the groove, and the outer surface of the wind guide cover has at least one recessed part, and the recessed part is opposite to The protrusion. Such as the centrifugal fan wheel of claim 1, wherein the air guide cover has a flange connected to the air outlet edge of the air guide cover. A centrifugal fan includes: a base with a shaft joint; A stator is located on the outer circumference of the shaft connection part; and as the centrifugal fan wheel of any one of claims 1 to 11, the hub is connected to a rotating shaft, the rotating shaft is rotatably arranged on the shaft connecting part, and a magnetic member is located on the The outer circumference of the rotating shaft is opposite to the stator.

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