TWI755333B - Impeller and fan with the same - Google Patents

Abstract

An impeller is presented to solve the problem of poor performance of the prior impeller. This impeller includes a hub; a plurality of main blades, with each of the main blades has an air inlet portion and an air outlet portion, with the air inlet portions are connected to the hub; a connecting ring is connected to the plurality of main blades; and a plurality of guiding vanes are arranged spacedly at the connecting ring, with each of the guiding vanes has a windward edge and a leeward edge, with the profile of the windward edge is inconsistent with the profile of the leeward edge, and they are asymmetrical with a chord line of each guiding vanes as the center. A fan with the impeller is also disclosed.

Description

Fan wheel and fan having the same

The present invention relates to a fan wheel and a fan, especially a fan wheel applicable to a cooling fan and a fan with the fan wheel.

Please refer to FIG. 1, which is a conventional fan wheel 9. The conventional fan wheel 9 has a hub 91, a plurality of blades 92 and a muffler ring 93. One end of each blade 92 is fixedly connected to the hub 91 , the muffler ring 93 connects the outer edges of the plurality of blades 92 . An embodiment similar to the conventional fan wheel 9 has been disclosed in Chinese Patent Application Publication No. 111828378.

The above-mentioned conventional fan wheel 9 already has more than 70 blades 92, and due to the limited number of blades 92 that can be arranged around the hub 91, it is difficult for the conventional fan wheel 9 to increase the blades 92. to increase the flow rate and flow of the airflow. In addition, the blade shapes and sizes of the blades 92 are the same, and the sound frequencies of the blades 92 tend to be superimposed in the same frequency spectrum when they rotate, so that abnormal sounds (abnormal sounds other than wind noise) are generated at specific frequencies. ).

In view of this, the conventional fan wheel 9 still needs to be improved.

In order to solve the above problems, the purpose of the present invention is to provide a fan wheel, which can effectively improve the flow velocity and flow of the airflow.

Another object of the present invention is to provide a fan wheel that can avoid abnormal noise during operation.

Yet another object of the present invention is to provide a fan wheel that is convenient for the manufacturer.

Another object of the present invention is to provide a fan with the above-mentioned fan wheel.

The directional or similar terms used throughout this disclosure, such as "front", "back", "left", "right", "top (top)", "bottom (bottom)", "inside", "outside" , "side surface", etc., mainly refer to the directions of the attached drawings, each directionality or its similar terms are only used to assist the description and understanding of the various embodiments of the present invention, and are not intended to limit the present invention.

The use of the quantifier "a" or "an" for the elements and components described throughout the present invention is only for convenience and provides a 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 a single The concept of also includes the plural case unless it is obvious that it means otherwise.

Similar terms such as "combined", "combined" or "assembled" mentioned in the whole text of the present invention mainly include the components that can be separated without destroying the components after the connection, or the components can not be separated after being connected, which are common knowledge in the field. It can be selected according to the material of the components to be connected or the assembly requirements.

The fan wheel of the present invention includes: a hub; several main fan blades, each of which has an air inlet part and an air outlet part, and the air inlet parts of the several main fan blades are connected to the hub; a connecting ring , connecting the several main fan blades; and several guide vanes, arranged at intervals on the connecting ring, each guide vane has a windward side edge and a leeward side edge, the windward side edge and the leeward side edge of the two The ends intersect to form an inner end point and an outer end point of the guide vane, the straight line connecting the inner end point and the outer end point is a chord line, the profile of the windward side edge and the leeward side The shape of the edge is inconsistent and asymmetric around the chord.

The fan of the present invention includes: a fan frame, the fan frame has a shaft connection part; a stator is arranged around the shaft connection part; Axle joint.

Accordingly, since the fan wheel of the present invention is provided with several guide vanes on its connecting ring, and the special shape of the guide vanes enhances the guide effect on the airflow, so as to improve the flow velocity and flow of the airflow; On the one hand, by the guide vanes and the main fan blades arranged at intervals, the effect that the sound frequencies of the blades are continuously superimposed in the same frequency spectrum can be slowed down. Therefore, the fan wheel of the present invention and the fan with the fan wheel can have high performance. Air volume and good sound quality (Sound quality, often referred to as SQ).

Wherein, any line segment between the windward side edge and the leeward side edge that is orthogonal to the chord line has a midpoint, and a line connecting the midpoints of all the line segments can form a mid-arc line, the mid-arc line and the chord line may not overlap completely. In this way, the guide vane has a better guide effect, can improve the smoothness of the airflow, and has the effects of improving the speed and flow of the airflow.

Wherein, the middle arc line and the chord line may only overlap at the inner end point and the outer end point, and the chord line may be located between the middle arc line and the windward side edge. In this way, the guide vane has a better guide effect, can improve the smoothness of the airflow, and has the effects of improving the speed and flow of the airflow.

Wherein, the chord line has a chord length, and there is a maximum distance between the chord line and the middle arc line, and the maximum distance is preferably not greater than 4% of the chord length. In this way, the guide vane has a better guide effect, can improve the smoothness of the airflow, and has the effects of improving the speed and flow of the airflow.

Wherein, a radial line passes through the outer end point and the center of the hub, and the included angle between the chord line and the radial line is preferably not greater than 4.5 degrees. In this way, the guide vane has a better guide effect, can improve the smoothness of the airflow, and has the effects of improving the speed and flow of the airflow.

Wherein, there is a maximum width between the windward side edge and the leeward side edge, the chord line has a chord length, and the maximum width is preferably not greater than 12% of the chord length. In this way, the guide vane has a better guide effect, can be easily processed and formed, and has the functions of increasing the flow rate and flow of the air flow and improving the molding yield.

Wherein, the chord line has a middle point, and the widest point between the windward side edge and the leeward side edge can be located between the middle point and the inner end point of the guide vane. In this way, the guide vane has a better guide effect, can be easily processed and formed, and has the functions of increasing the flow rate and flow of the air flow and improving the molding yield.

Wherein, the widest point between the windward side edge and the leeward side edge corresponds to a marking point on the chord line, the chord line has a chord length, and the distance between the marking point and the inner end point is preferably the chord 20 to 40% longer. In this way, the guide vane has a better guide effect, can be easily processed and formed, and has the functions of increasing the flow rate and flow of the air flow and improving the molding yield.

Wherein, a circumscribed circle passes through the air outlet parts of the plurality of main fan blades, and the outer end points extend in a direction away from the hub and may not protrude beyond the circumscribed circle, preferably located in the circumscribed circle. In this way, the guide vane has a better guide effect, can improve the smoothness of the airflow, and has the effects of improving the speed and flow of the airflow.

Wherein, the inner end point of the guide vane extends toward the direction close to the hub and may not protrude beyond the inner ring edge of the connecting ring, and is preferably located at the inner ring edge. In this way, the guide vane has a better guide effect, can improve the smoothness of the airflow, and has the effects of improving the speed and flow of the airflow.

Wherein, the main fan blade may have a swept-back section and a swept-forward section, the swept-back section is closer to the hub than the swept-forward section, and the inner end point may be opposite to the swept-forward section in the circumferential direction. In this way, it can be ensured that the guide vane is not too long to affect the guide effect, and has the effect of improving the flow velocity and flow of the airflow.

Wherein, the outer end point and the inner end point can respectively protrude beyond the outer ring edge and the inner ring edge of the connecting ring, a circumscribed circle passes through the air outlet parts of the plurality of main fan blades, and the outer end of the guide vane The point extends away from the hub and may not protrude beyond the circumcircle. In this way, the guide vane has a better guide effect, can be easily processed and formed, and has the functions of increasing the flow rate and flow of the air flow and improving the molding yield.

Wherein, the air outlet portions of the plurality of main fan blades extend in a direction away from the hub and may not protrude beyond the outer ring edge of the connecting ring, and are preferably tangential and flush. In this way, the air outlet portion of the main fan blade can have better stability, which also helps to improve the flow velocity and flow of the airflow.

Wherein, the hub can have a main body and an outer extension part, the outer extension part can be connected to the main body and the air inlet parts of the plurality of main fan blades, and a base circle is connected to the air inlet parts of the main fan blades through the plurality of main fan blades. At the hub, a circumscribed circle passes through the air outlet parts of the plurality of main fan blades, the circumscribed circle and the base circle have a distance, and the ratio of the distance to the diameter of the base circle is about 0.2-0.4, preferably about 0.3. In this way, the number of the main fan blades can be moderate and the effect of improving the flow velocity and flow of the airflow can be achieved.

Wherein, the total number of the plurality of main fan blades and the plurality of guide vanes is preferably greater than or equal to 136 and less than or equal to 268. In this way, the aforementioned effects of increasing the flow rate and flow of the airflow can be more significantly improved.

Wherein, there may be at least one aforementioned guide vane between any two adjacent main fan blades. In this way, the aforementioned effects of the flow rate and flow rate of the lifted airflow can be improved relatively evenly.

In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the preferred embodiments of the present invention are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings:

Please refer to FIG. 2, which is a preferred embodiment of the fan wheel P of the present invention, which includes a hub 1, a plurality of main fan blades 2, a connecting ring 3 and a plurality of guide vanes 4. The plurality of The main fan blades 2 are disposed around the hub 1 , the connecting ring 3 is connected to the plurality of main fan blades 2 , and the plurality of guide vanes 4 are located on the connecting ring 3 .

Referring to Figures 2 and 3, the hub 1 has a main body 1a, and the central part of the main body 1a can be combined with a rotating shaft 5, which can be understood by those skilled in the art, and will not be described in detail here. In this embodiment, the main body 1a may have a disk body 11 and a ring wall 12, and the ring wall 12 is connected to the periphery of the disk body 11, so that the main body 1a can form an inverted cup body. The rotating shaft 5 can be combined with the disk body 11, and the annular wall 12 can be directly or indirectly connected to the plurality of main fan blades 2; The outer extension part 1b is connected to the main body 1a, the outer extension part 1b can be integrally connected with the ring wall 12, and the outer extension part 1b can be radially outward from the ring wall 12 (ie, away from the rotation shaft 5). ) is extended and formed for the connection of the plurality of main fan blades 2 , which is an example of the aforementioned indirect connection. In contrast, in other embodiments without the outer extension 1b (as shown in FIG. 7 ), the plurality of main blades 2 can be directly connected to the ring wall 12 of the main body 1a. The hub 1 may further have a magnetic element 13 , the magnetic element 13 is located on the inner surface of the main body 1 a of the hub 1 , such as on the inner surface of the disk body 11 or the inner peripheral surface of the ring wall 12 , and surrounds the rotating shaft 5 set up.

Referring to Figures 3 and 4, each of the main fan blades 2 has an air inlet portion 21 and an air outlet portion 22. In this embodiment, the air inlet portions 21 of the plurality of main fan blades 2 can be connected to The outer extension portion 1b of the hub 1 enables the plurality of main blades 2 to be radially arranged around the hub 1 . The present invention does not limit the material of the main fan blades 2, and each of the main fan blades 2 and the outer extension portion 1b can be connected by means of snapping, pasting, fitting, or integrally formed connection. For example, when the outer extension portion 1b and the plurality of main blades 2 are made of different materials of metal and plastic, respectively, the plurality of main blades 2 can be selectively combined with the outer extension portion 1b of the hub 1; or , when the material of the outer extension portion 1b and the plurality of main fan blades 2 are the same, they can be integrally connected by injection molding, so as to improve the structural strength and production efficiency.

A base circle C1 (represented by a two-dot chain line in the figure) is connected to the hub 1 through the air inlet portions 21 of the plurality of main fan blades 2 , and a circumscribed circle C2 passes through the air outlet portions of the plurality of main fan blades 2 . twenty two. Wherein, the base circle C1 and the circumscribed circle C2 are both virtual imaginary circles, which are not real edges on the actual product of the fan wheel P. The circumscribed circle C2 and the base circle C1 have a distance D1, and the ratio of the distance D1 to the diameter D2 of the base circle C1 is about 0.2˜0.4, preferably 0.3.

On the other hand, the present invention does not limit the blade shape of the main fan blade 2. From the top view of the fan wheel P (please refer to FIG. 3), the main fan blade 2 in this embodiment may have a swept back section 2a and A forward swept section 2b, the extension direction of the backward swept section 2a is opposite to the rotation direction K of the fan wheel P, the extension direction of the forward swept section 2b is the same as the rotation direction K of the fan wheel P, the backward swept section 2a Or the forward swept section 2b can be in arc shape as shown in the figure; the rearward swept section 2a is closer to the hub 1 than the forward swept section 2b, and the air outlet 22 can be located at the end of the forward swept section 2b.

The connecting ring 3 is connected to the plurality of main blades 2 and not connected to the hub 1 , so as to stabilize the plurality of main blades 2 . Generally speaking, the connecting ring 3 is closer to the air outlet portions 22 of the plurality of main fan blades 2 and farther away from the air inlet portions 21 of the plurality of main fan blades 2; in this embodiment, the plurality of main fan blades The air outlet 22 of 2 extends in a direction away from the hub 1 and may not protrude beyond the outer ring edge 31 of the connecting ring 3, and is preferably aligned with the outer ring edge 31 of the connecting ring 3, so that the aforementioned external The circle C2 overlaps the outer rim 31 of the connecting ring 3 . Furthermore, in other embodiments, the number of the connecting rings 3 may also be several, and the several connecting rings 3 may be arranged in the form of concentric circles.

Referring to Figures 2 and 4, the plurality of guide vanes 4 are disposed on the connecting ring 3 at intervals, and preferably, at least one of the aforementioned guide vanes 4 can be provided between any two adjacent main fan blades 2 . In other words, although this embodiment takes the example of “there is a single guide vane 4 between any two adjacent main fan blades 2”, it is not limited to this; in other embodiments (as shown in FIG. 9 ) shown), it can also be in the form of “there are several guide vanes 4 between any two adjacent main fan blades 2”, or, it can also include “part of two adjacent main fan blades 2 with at least one guide vane 4 between them”. For the flow vanes 4, there is no guide vane 4" between two adjacent main fan blades 2 in part. In addition, the total number of the main blades 2 and the guide vanes 4 is preferably greater than or equal to 136 and less than or equal to 268.

Please refer to FIGS. 4 and 5 , the guide vanes 4 are not connected to the hub 1 , and the length of each guide vane 4 is shorter than that of the main fan blade 2 . Seen from the bottom view of the fan wheel P, each of the guide vanes 4 has an opposite windward side edge 41 and a leeward side edge 42, and the windward side edge 41 and the leeward side edge 42 may face the same or different directions. Curved, and the profile of the windward side edge 41 is inconsistent with the profile of the leeward side edge 42, for example, more than 50% of the parts are not parallel to each other; that is, the width of the guide vane 4 (the windward side The distance between the edge 41 and the leeward side edge 42 ) is variable, which is different from that of the main fan blade 2 in which the blade width is mostly fixed.

In detail, the two ends of the windward side edge 41 and the leeward side edge 42 intersect to form an inner end point 43 and an outer end point 44 of the guide vane 4 , and the inner end point 43 is the guide vane 4 For the part closest to the hub 1 , the outer end point 44 is the part of the guide vane 4 farthest from the hub 1 . The outer end 44 of the guide vane 4 extends in the direction away from the hub 1 and may not protrude beyond the aforementioned circumscribed circle C2, and is preferably located in the circumscribed circle C2, so that the air outlet portions of the plurality of main fan blades 2 22 can be aligned with the outer end points 44 of the plurality of guide vanes 4 . The inner end point 43 of the guide vane 4 can be located at the forward swept section 2b in the circumferential direction of the inner end point 43 without protruding to the rearward swept section 2a, so as to ensure that the guide vane 4 is not too long In this embodiment, the outer ring edge 31 of the connecting ring 3 overlaps with the circumscribed circle C2, and the inner end 43 of the guide vane 4 can also protrude beyond the inner ring edge 32 of the connecting ring 3.

In the embodiment shown in FIG. 8, the outer end 44 and the inner end 43 of the guide vane 4 can respectively protrude beyond the outer edge 31 and the inner edge 32 of the connecting ring 3, and the number of The outer end points 44 of each guide vane 4 can still extend in a direction away from the hub 1 and remain not protruding beyond the aforementioned circumscribed circle C2. In the embodiment shown in FIG. 9 , the inner end 43 extends toward the direction close to the hub 1 and may not protrude beyond the inner edge 32 of the connecting ring 3 , and is preferably located at the inner edge 32 . The outer end points 44 extend away from the hub 1 and can protrude beyond the outer ring edge 31 of the connecting ring 3 , and the outer end points 44 of the guide vanes 4 can still be directed away from the hub 1 Extend and maintain not protruding beyond the aforementioned circumscribed circle C2. Alternatively, the outer end point 44 and the inner end point 43 of the guide vane 4 may not protrude beyond the outer ring edge 31 and the inner ring edge 32 of the connecting ring 3 , which are not limited in the present invention.

Please refer to Figures 4 and 5 again, the straight line connecting the inner end point 43 and the outer end point 44 of the guide vane 4 is a chord line 45, and the shape line of the windward side edge 41 The profile line of the leeward side edge 42 is asymmetric with the chord line 45 as the center. In addition, any line segment J1 between the windward side edge 41 and the leeward side edge 42 that is orthogonal to the chord line 45 has a midpoint J2, and a line connecting the midpoints J2 of all line segments J1 can form a mid-arc line 46 (Mean camber line), the middle arc line 46 and the chord line 45 do not completely overlap; more precisely, the middle arc line 46 and the chord line 45 can only overlap at the inner end point 43 and the outer end point 44 , and the chord line 45 is located between the middle arc line 46 and the windward side edge 41 , a radial line L passes through the outer end point 44 and the center N of the hub 1 (ie the axis of the rotating shaft 5 ), the chord line The included angle θ between 45 and the radial line L is preferably not greater than 4.5 degrees.

Please refer to FIG. 6 , the chord line 45 has a chord length G, and there is a maximum distance W1 between the chord line 45 and the middle arc line 46 , and the maximum distance W1 is preferably not greater than 4% of the chord length G . The width of the guide vane 4 in this embodiment can be increased from the inner end 43 to the outer end 44, and then gradually decreases to the outer end 44 after reaching a widest point M; that is, the windward side edge There is a maximum width W2 between 41 and the leeward side edge 42 at the widest point M, and the maximum width W2 is preferably not greater than 12% of the chord length G. The chord line 45 has a middle point P1 , and the widest point M between the windward side edge 41 and the leeward side edge 42 can be located between the middle point P1 and the inner end point 43 of the guide vane 4 . The widest point between the windward side edge 41 and the leeward side edge 42 is aligned with a marking point P2 on the chord line 45 , and the distance between the marking point P2 and the inner end point 43 is preferably the chord length G. 20 to 40%.

Please refer to FIG. 10 , the aforementioned fan wheel P can be matched with a fan frame 6 and a stator 7 to form a fan F together. The fan frame 6 can have a base 61 and an upper cover 62, the base 61 has a shaft connecting portion 611 for assembling the fan wheel P, the upper cover 62 can be combined with the top of the base 61, and an air inlet 63 can be opened In the upper cover 62 , the upper cover 62 and the base 61 can jointly form an air outlet 64 at the side end of the fan frame 6 . The fan F further has a stator 7 , the stator 7 is arranged around the shaft connecting portion 611 , and the magnetic element 13 is opposite to the stator 7 to induce magnetism. In this way, when the stator 7 is energized to generate a magnetic field to drive the fan wheel P to rotate, the external air flow can flow into the fan frame 6 from the air inlet 63 and flow out of the fan frame 6 from the air outlet 64 .

Among them, because the fan wheel P has the several guide vanes 4, in addition to increasing the number of vanes, the special shape of the several guide vanes 4 strengthens the airflow guide effect to effectively improve the airflow. The smoothness of the flow enables the fan F to further improve the speed and flow of the airflow, and has a better air volume. On the other hand, by the guide vanes 4 and the main fan blades 2 arranged at intervals, the effect of the continuous superposition of the sound frequencies of the blades in the same frequency spectrum can be reduced, and the originally relatively fixed fan noise frequencies can be dispersed to more In a wide frequency spectrum, the energy carried by the main frequency of the fan is further weakened, thereby reducing fan noise and avoiding abnormal sound during operation, so both the fan wheel P and the fan F can have good sound quality.

In order to prove the above-mentioned effects, the present invention adopts the fan wheel P shown in Figure 2 (hereinafter referred to as the "improved fan wheel") and a comparative fan wheel to conduct tests such as air volume and sound quality respectively; The comparison fan wheel is only provided with the plurality of guide vanes 4, and the other parts are of the same shape. It can be seen from Fig. 11 that under the condition of the same rotational speed of 5100 RPM, the flow rate of the outer periphery of the improved fan wheel is significantly improved compared with that of the comparison fan wheel; at the air outlet of the fan, the flow rate of the improved fan wheel is Compared with the comparative fan wheel, the flow velocity is also improved and more uniform. In terms of flow rate, it can be seen from Figure 12 that under the condition of the same speed of 5100 RPM, the flow rate of the improved fan wheel is about 0.91 CFM, the flow rate of the comparison fan wheel is about 0.85 CFM, and the lift rate is 7%. The present invention obviously has the effect of improving the performance of the fan.

In addition, in terms of noise experiment, it can be seen from Figure 13 that under the condition of the same rotation speed of 5100 RPM, the sound power of the comparative fan wheel is larger, and the sound power of the improved fan wheel is smaller. In addition, it can be seen from Fig. 14 that the peaks of the sound pressure levels of the comparison fan wheel at different frequencies are higher and the difference is larger. Compared with this, the sound pressure levels of the improved fan wheel at different frequencies The peaks are relatively low and less variable. Therefore, the improved fan wheel has better sound quality than the comparative fan wheel.

To sum up, since the fan wheel of the present invention is provided with several guide vanes on its connecting ring, and the special shape of the guide vanes enhances the guide effect on the airflow, so as to improve the flow rate and flow of the airflow; On the other hand, by the guide vanes and the main fan blades arranged at intervals, the effect that the sound frequencies of the blades are continuously superimposed in the same frequency spectrum can be reduced. Therefore, the fan wheel of the present invention and the fan with the fan wheel can be used. With high air volume and good sound quality.

Although the present invention has been disclosed by the above-mentioned preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications relative to the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the patent application attached hereto.

﹝this invention﹞ 1: Wheel hub 1a: subject 1b: Outer extension 11: Disc body 12: Ring Wall 13: Magnetic parts 2: Main fan blade 2a: Swept back section 2b: forward sweep 21: Inlet part 22: Air outlet 3: connecting ring 31: Outer Rim 32: Inner Ring Rim 4: Guide vanes 41: Windward Edge 42: Leeward Side Edge 43: Inner endpoint 44: Outer endpoint 45: Strings 46: Mid-arc 5: Spindle 6: fan frame 61: Pedestal 611: Shaft joint 62: upper cover 63: air inlet 64: air outlet 7: Stator C1: base circle C2: circumcircle D1: Spacing D2: Diameter F: Fan G: string length J1: Line segment J2: Midpoint K: direction of rotation L: radial line M: the widest point N: Center P: fan wheel P1: middle point P2: marker point W1: maximum spacing W2: maximum width θ: included angle ﹝Accustomed ﹞ 9: Fan wheel 91: Wheels 92: Blades 93: muffler ring

[Picture 1] A three-dimensional view of a conventional fan wheel. [Fig. 2] A perspective view of a fan wheel according to a preferred embodiment of the present invention. [Figure 3] A top view of the fan wheel according to a preferred embodiment of the present invention. [Fig. 4] The bottom view of the fan wheel of a preferred embodiment of the present invention. [Fig. 5] As shown in Fig. 4, the partial structure of area A is enlarged. [Picture 6] As shown in the enlarged view of the local structure of area A in Figure 4. [Fig. 7] The top view of the fan wheel according to another embodiment of the present invention, the hub does not have an outer extension. [Fig. 8] The bottom view of the fan wheel according to another embodiment of the present invention, the two ends of the guide vanes are beyond the outer and inner rims of the connecting ring. [Fig. 9] The bottom view of the fan wheel according to another embodiment of the present invention, one end of the guide vane is beyond the inner ring edge of the connecting ring, and there are several guide vanes between any two adjacent main fan blades. [Fig. 10] An exploded perspective view of a fan according to a preferred embodiment of the present invention. [Fig. 11] Comparing the flow velocity simulation diagram of the fan wheel and the improved fan wheel at the same speed. [Figure 12] Compare the flow bar chart of the fan wheel and the improved fan wheel at the same speed. [Fig. 13] Comparing the noise simulation diagram of the fan wheel and the improved fan wheel at the same speed. [Figure 14] Compare the sound octave diagram of the fan wheel and the improved fan wheel at the same speed.

1: Wheel hub

1a: subject

1b: Outer extension

11: Disc body

12: Ring Wall

13: Magnetic parts

2: Main fan blade

2a: Swept back section

2b: forward sweep

21: Inlet part

22: Air outlet

3: connecting ring

31: Outer Rim

32: Inner Ring Rim

4: Guide vanes

41: Windward Edge

42: Leeward Side Edge

43: Inner endpoint

44: Outer endpoint

5: Spindle

C1: base circle

C2: circumcircle

K: direction of rotation

N: Center

P: fan wheel

Claims (19)

A fan wheel, comprising: wheel hub; a plurality of main fan blades, each of which has an air inlet portion and an air outlet portion, and the air inlet portions of the plurality of main fan blades are connected to the hub; a connecting ring connecting the plurality of main blades; and Several guide vanes are arranged on the connecting ring at intervals, each guide vane has a windward side edge and a leeward side edge, the windward side edge and the two ends of the leeward side edge intersect to form a windward side edge of the guide vane An inner end point and an outer end point, the straight line connecting the inner end point and the outer end point is a chord line, the profile line of the windward side edge is inconsistent with the profile line of the leeward side edge, and the chord The line is asymmetric in the center. The fan wheel of claim 1, wherein any line segment between the windward side edge and the leeward side edge that is orthogonal to the chord line has a midpoint, and a line connecting the midpoints of all the line segments forms a mid-arc line, The mid-arc line does not completely overlap the chord line. The fan wheel of claim 2, wherein the middle arc line and the chord line overlap only at the inner end point and the outer end point, and the chord line is located between the middle arc line and the windward side edge. The fan wheel of claim 2, wherein the chord line has a chord length, and there is a maximum distance between the chord line and the middle arc line, and the maximum distance is not greater than 4% of the chord length. The fan wheel of claim 1, wherein a radial line passes through the outer end point and the center of the hub, and the included angle between the chord line and the radial line is not greater than 4.5 degrees. The fan wheel of claim 1, wherein there is a maximum width between the windward side edge and the leeward side edge, the chord line has a chord length, and the maximum width is not greater than 12% of the chord length. The fan wheel of claim 1, wherein the chord line has an intermediate point, and the widest point between the windward side edge and the leeward side edge is located between the intermediate point and the inner end point of the guide vane. The fan wheel of claim 1, wherein the widest point between the windward side edge and the leeward side edge is opposite to a marking point on the chord line, the chord line has a chord length, the marking point and the inner end The spacing of the points is 20-40% of the chord length. The fan wheel of claim 1, wherein a circumscribed circle passes through the air outlet portions of the plurality of main fan blades, and the outer end points extend in a direction away from the hub and do not protrude beyond the circumscribed circle. The fan wheel of claim 9, wherein the outer end point is located at the circumcircle. The fan wheel of claim 1, wherein the inner end point of the guide vane extends toward the direction close to the hub and does not protrude beyond the inner ring edge of the connecting ring. The fan wheel of claim 1, wherein the main fan blade has a swept-back section and a swept-forward section, the swept-back section is closer to the hub than the swept-forward section, and the inner end point is opposite to the hub in the circumferential direction. Sweep section. The fan wheel of claim 1, wherein the outer end point and the inner end point respectively protrude beyond the outer ring edge and the inner ring edge of the connecting ring, and a circumscribed circle passes through the air outlet parts of the plurality of main fan blades, The outer end of the guide vane extends away from the hub and does not protrude beyond the circumscribed circle. The fan wheel of claim 1, wherein the air outlet portions of the plurality of main fan blades extend in a direction away from the wheel hub and do not protrude beyond the outer ring edge of the connecting ring. The fan wheel of claim 14, wherein the air outlet portions of the plurality of main fan blades are aligned with the outer peripheral edge of the connecting ring. The fan wheel of claim 1, wherein the hub has a main body and an outer extension portion, the outer extension portion is connected to the main body and the air inlet portions of the plurality of main fan blades, and a base circle passes through the plurality of main fan blades The air inlet part is connected to the hub, a circumscribed circle passes through the air outlet parts of the several main fan blades, the circumscribed circle and the base circle have a distance, and the ratio of the distance to the diameter of the base circle is 0.2-0.4. The fan wheel of claim 1, wherein the total number of the plurality of main fan blades and the plurality of guide vanes is greater than or equal to 136 and less than or equal to 268. The fan wheel according to any one of claims 1 to 17, wherein at least one of the aforementioned guide vanes is provided between any two adjacent main fan blades. A fan comprising: a fan frame, the fan frame has a shaft joint; a stator disposed around the shaft joint; and As in the fan wheel of any one of claims 1 to 18, the hub is connected with a rotating shaft, and the rotating shaft is rotatably arranged on the shaft connection portion.

Images