TWI614412B - Axial fan and impeller thereof - Google Patents

Abstract

An axial flow fan and a fan wheel thereof are used to solve the problem of high noise operation of a conventional axial flow fan. The fan wheel of the axial flow fan comprises a hub and a plurality of blades. The hub has an axis of rotation. The plurality of blades are coupled to the hub, and each of the blades has an outer edge in a radial direction of the fan wheel, and the outer edge is an air inlet end and an air outlet at both ends of the fan wheel. End point. Wherein, the outer edge further has a tapping starting point, and the distance from the tapping starting point to the rotating axis is greater than the distance from the air inlet end point to the rotating axis.

Description

Axial fan and its fan wheel

The present invention relates to an axial flow fan and a fan wheel thereof, and more particularly to an axial flow fan and a fan wheel thereof capable of reducing fan noise.

Please refer to a conventional axial fan 9 shown in FIG. 1 , which comprises a fixing component 91 and a rotating component 92 . The fixing component 91 includes a frame 91a having a side wall 911 surrounding the air passage 912 to receive the rotating component 92. The rotating assembly 92 has a fan wheel 92a. The fan wheel 92a includes a hub 921 and a plurality of blades 922. Each of the blades 922 has an inner edge 922a and an outer edge in the radial direction of the fan wheel 92a. 922b, the inner edge 922a is coupled to the hub 921. The outer edge 922b is adjacent to the side wall 911, and the distance from any position of the outer edge 922b to the center of the hub 921 of the fan wheel 92a is substantially maintained. Accordingly, any position of the outer edge 922b of each of the blades 922 is equal to the gap of the fan frame 91a.

However, since the rotating assembly 92 rotates relative to the fixed assembly 91, the airflow driven by the fan wheel 92a and flowing through the air passage 912 of the fan frame 91a may form a severe force on the air outlet side of the air passage 912. The pressure changes, so that noise is easily generated during the operation of the axial fan 9.

In view of the above, there is a need to provide a further improved axial flow fan and its fan wheel to solve the problem that the airflow will form a severe pressure change on the air outlet side of the air passage 912 when the conventional axial fan 9 is in operation. The axial fan 9 has a problem of high noise operation.

The invention provides an axial flow fan and a fan frame thereof, and the axial flow fan can solve the problem that the above-mentioned conventional axial flow fan has high noise operation by the fan wheel.

In order to achieve the foregoing object, the technical method of the present invention includes the following: an axial fan embodiment of the present invention includes: a fan wheel having a hub and a plurality of blades, the hub having an axis of rotation, a plurality of blades are coupled to the hub, each of the blades having an outer edge in a radial direction of the fan wheel, the outer edge being an air inlet end and an air outlet end at an axial end of the fan wheel The outer edge further has a tapered starting point, the distance from the starting point of the tapping to the axis of rotation is greater than the distance from the end of the wind inlet to the axis of rotation; a frame having a base and a side wall, the base is rotatably coupled to the fan wheel, and the side wall surrounds a wind passage to receive the fan wheel, and the side wall forms a relationship between the tapered starting points of the outer edge a first gap, a second gap formed between the side wall and the air inlet end of the outer edge, the ratio of the second gap divided by the first gap is 1.5 to 2.5; and a driving component, the driving component The utility model has a magnetic component and a magnetic sensing component, and the excitation component is disposed on the hub and the fan wheel Wherein a base of the magnetic sensitive member disposed on the other of the hub and the base.

In the axial fan according to the above aspect, the ratio of the second gap divided by the first gap is 1.9 to 2.1, and the effect of suppressing the pressure change of the airflow formed on the air outlet side of the air passage can be made more remarkable.

In the above-described axial flow fan, the length of the outer edge from the tapered starting point to the end of the air inlet is at least 2/3 of the total length of the outer edge. Thereby, the distance of at least 2/3 of the outer edge to the axis of rotation will be less than the distance from the starting point of the tapping to the axis of rotation to ensure that the fan wheel can effectively suppress airflow in one of the axial fans The pressure change formed by the outlet side of the drive passage.

The axial flow fan as described above, wherein the tapping starting point is located between the air inlet end point and the air outlet end point, and the distance from the tapping starting point to the rotating axis is equal to The distance from the exit end to the axis of rotation. Thereby, the distance from the outer edge of the blade to the axis of rotation can be tapered from the tapered starting point toward the inlet end.

The axial flow fan as described above, wherein the tapered starting point of the outer side edge of any one of the blades is the air outlet end of the outer edge of the blade. Thereby, the distance from the portion of the outer edge other than the outlet end point to the rotation axis is smaller than the distance from the outlet end point to the rotation axis, and the fan wheel can be lifted to suppress the air flow in the axial flow fan. The pressure change effect formed by the wind side of the wind passage.

The axial flow fan as described above, wherein the outer edge of any one of the blades further has a tapered end point, and the tapered end point is located between the air inlet end point and the tapered starting point, and the The distance from the end point of the contraction to the axis of rotation is equal to the distance from the end of the wind inlet to the axis of rotation. Thereby, the distance from the outer edge of the blade to the axis of rotation may be tapered from the tapered starting point toward the tapered end point, such that the distance from the outer edge of the blade to the axis of rotation is at the inlet The endpoint is reduced to a minimum before the endpoint.

With the above structure, the axial fan embodiment of the present invention and its fan wheel have a distance from the starting point of the outer edge of each of the blades to the axis of rotation greater than the inlet end point thereof to the axis of rotation. The distance between the side wall of the fan frame and the outer edge of each of the blades may be gradually increased from the tapered starting point toward the inlet end point to effectively suppress the airflow when the fan wheel drives airflow The pressure change formed by the airflow on the air outlet side of the air passage is effective to reduce the running noise of the axial fan.

〔this invention〕

1‧‧‧fan wheel

11‧‧·wheels

111‧‧‧Rotation axis

12‧‧‧ fan leaves

121‧‧‧ outside edge

2‧‧‧Fan frame

21‧‧‧Base

22‧‧‧ Side wall

23‧‧‧Wind passage

3‧‧‧Drive components

31‧‧‧Magnetic parts

32‧‧‧Magnetic parts

a‧‧‧Inlet terminal

b‧‧‧Outlet end

c‧‧‧Starting point

D1‧‧‧ distance

D2‧‧‧ distance

D3‧‧‧ distance

D4‧‧‧distance

e‧‧‧Trigger termination point

G1‧‧‧First gap

G2‧‧‧second gap

R1‧‧‧ wind side area

R2‧‧‧ wind side area

[study]

9‧‧‧Axial fan

91‧‧‧Fixed components

91a‧‧‧Fan frame

911‧‧‧ Side wall

912‧‧‧Wind passage

92‧‧‧Rotating components

92a‧‧‧fan wheel

921‧‧ wheels

922‧‧‧ fan leaves

922a‧‧‧ inner edge

922b‧‧‧ outer edge

Figure 1: Appearance of a conventional axial fan.

Fig. 2 is a top plan view showing the appearance of a fan wheel of an embodiment of the axial flow fan of the present invention.

Fig. 3 is a cross-sectional view showing the fan wheel of an embodiment of the axial flow fan of the present invention.

Fig. 4 is a top plan view showing an embodiment of an axial flow fan according to the present invention.

Figure 5 is a cross-sectional view showing an embodiment of an axial flow fan of the present invention.

Figure 6: Pressure distribution diagram when the conventional axial fan is in operation.

Fig. 7 is a view showing the pressure distribution during the operation of an embodiment of the axial flow fan of the present invention.

Fig. 8 is a top plan view showing the appearance of a fan wheel of another embodiment of the axial flow fan of the present invention.

Fig. 9 is a top plan view showing the appearance of a fan wheel of still another embodiment of the axial flow fan of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Referring to Figures 2 and 3, there is shown a fan wheel 1 of an axial flow fan according to an embodiment of the present invention. The fan wheel 1 includes a hub 11 and a plurality of blades 12, and the plurality of blades 12 are coupled to the hub. 11. The hub 11 has an axis of rotation 111 which is parallel to the axial direction of the fan wheel 1 and which is centered by the hub 11. Each of the blades 12 is disposed obliquely with respect to the axial direction of the fan wheel 1 , and each of the blades 12 has an outer edge 121 in the radial direction of the fan wheel 1 , and the outer edge 121 is located at the blade 12 away from the hub 11 one side. The two ends of the outer edge 121 in the axial direction of the fan wheel 1 are an air inlet end point a and an air outlet end point b, and the distance d1 of the air outlet end point b to the rotation axis 111 is greater than the air inlet end point. a distance d2 to the axis of rotation 111.

In this embodiment, the outer edge 121 further has a tapered starting point c, and the tapered starting point c is located between the inlet end point a and the outlet end b, and the tapered starting point The distance d3 from the point c to the axis of rotation 111 is equal to the distance d1 from the outlet end b to the axis of rotation 111. In other words, the distance d3 from the tapping starting point c to the axis of rotation 111 is also greater than the distance d2 from the inlet end point a to the axis of rotation 111. The distance from the outer side edge 121 of the blade 12 to the axis of rotation 111 is tapered by the tapered starting point c toward the inlet end a.

The outer edge 121 has a length from the tapered starting point c to the inlet end a, preferably at least 2/3 of the total length of the outer edge 121. According to this, the outer edge 121 to The distance of the 2/3 less portion to the axis of rotation 111 will be less than the distance d3 from the tapping starting point c to the axis of rotation 111.

With the above structure, as shown in FIGS. 4 and 5, the fan wheel 1 of the embodiment of the axial flow fan of the present invention can be mounted inside a frame 2 in actual use, and the fan frame 2 has a base. a seat 21 and a side wall 22, the base 21 is rotatably coupled to the fan wheel 1, and the side wall 22 surrounds a wind passage 23 for receiving the fan wheel 1. The air passage 23 penetrates the frame 2 on the two sides of the axial direction. In addition, the axial flow fan may further include a driving component 3 having an excitation component 31 and a magnetic sensing component 32, wherein the excitation component 31 is disposed on one of the hub 11 and the base 21, The magnetic sensing member 32 is disposed on the other of the hub 11 and the base 21. The magnetic component 31 may be an iron core, and the iron core may be composed of a stack of silicon steel sheets, and the outer core of the iron core is wound around an excitation coil; the magnetic sensitive component 32 may be a permanent magnet group. An air gap is formed between the excitation member 31 and the magnetic sensing member 32, and when the axial fan embodiment is operated, the excitation member 31 can generate magnetic interlinkage sensing with the magnetic sensing member 32 to drive the fan. The wheel 1 rotates relative to the base 21.

According to this, when the fan wheel 1 rotates relative to the base 21, each of the blades 12 can introduce airflow from one side having the air inlet end a, and force the airflow to have one side of the air outlet end b The fan wheel 1 is removed to drive airflow through the air passage 23. Wherein, since the distance from the outer side edge 121 of each of the blades 12 to the rotation axis 111 is gradually reduced from the tapered starting point c toward the air inlet end point a, the side wall 22 of the fan frame 2 and each of the side walls 22 The gap between the outer side edges 121 of the blade 12 will gradually expand from the tapered starting point c toward the inlet end a, so that when the fan wheel 1 drives the generation of airflow, the airflow exits the air passage 23 The pressure change formed on the wind side (i.e., on one side of the outlet end b of each of the blades 12) can be effectively slowed down, thereby reducing the running noise of the axial fan.

More specifically, a first gap g1 is formed between the tapered starting point c of the outer edge 121 and the side wall 22, and the air inlet end point a to the side wall 22 of the outer edge 121 is shaped. Form a second gap g2. Since the distance d3 from the tapping starting point c to the axis of rotation 111 is greater than the distance d2 from the inlet end point a to the axis of rotation 111, the second gap g2 is bound to be greater than the first gap g1. Compared with the conventional axial fan 9 described above, any position of the outer edge 922b of each of the blades 922 is equal to the gap of the fan frame 91a. The fan wheel 1 of the embodiment of the axial flow fan of the present invention is made of the fan. The gap between the side wall 22 of the frame 2 and the outer side edge 121 of each of the blades 12 is gradually enlarged from the tapered starting point c toward the air inlet end a, which can effectively suppress the airflow in the air passage 23 The pressure change formed on the outlet side.

Moreover, the ratio B of the second gap g2 divided by the first gap g1 may be 1.5 to 2.5, so as to prevent the second gap g2 from being excessively large to cause airflow overflow, and the first gap g1 and the second gap are simultaneously made. G2 has a sufficient difference to suppress the pressure change effect of the airflow formed on the air outlet side of the air passage 23. Furthermore, the ratio B of the second gap g2 and the first gap g1 is preferably 1.9 to 2.1, more preferably 2, and the pressure of the airflow formed on the air outlet side of the air passage 23 is changed. The amplitude can be greatly reduced to effectively suppress the running noise, and the air volume and the wind pressure of the axial fan can be further improved.

Referring to FIG. 6, the pressure distribution diagram of the conventional axial fan 9 is in a range of 1.47 to 4.79 inH2O. Therefore, the maximum pressure change caused by the airflow is more severe (more than 3 inH2O). In contrast, referring to FIG. 7 , the pressure distribution diagram of the embodiment of the axial flow fan of the present invention is operated, and the fan wheel 1 of the embodiment can be designed such that the ratio of the first gap g1 and the second gap g2 is B is 2, and the pressure of an air outlet side region R2 of the air passage 23 of the embodiment of the axial flow fan of the present invention is substantially in the range of 1.88 to 3.64 inH2O, so that the maximum pressure change formed by the airflow is relatively gentle (less than 2 inH2O). ). Therefore, the axial fan embodiment of the present invention can effectively reduce the pressure change formed by the airflow on the air outlet side of the air passage 23, thereby achieving the effect of reducing the running noise of the axial fan.

Please refer to the following table 1. For the conventional axial fan 9 and the present The actual measurement results of the air volume, wind pressure, and noise generated during the operation of the embodiment of the axial-flow fan.

Wherein, the fan wheel 92a of the conventional axial fan 9 and the fan wheel 1 of the embodiment have the same size (for example, the same maximum outer diameter), and the conventional axial fan 9 and the present invention are driven at the same power. The axial fan embodiment operates at the same speed, and it can be seen that the axial fan embodiment of the present invention can even produce higher air volume and wind pressure. Therefore, the embodiment of the axial flow fan of the present invention and its fan wheel 1 do not adversely affect the performance of the fan. It should be noted that the noise generated by the conventional axial fan 9 is 2.1 dB higher, and the axial fan embodiment of the present invention can effectively reduce the running noise, and can further increase the air volume of the axial fan. And wind pressure.

As described above, the outer edge 121 has a length from the tapered starting point c to the inlet end a, preferably at least 2/3 of the total length of the outer edge 121. Accordingly, the distance from the portion of the outer edge 121 of at least 2/3 to the axis of rotation 111 will be less than the distance d3 from the taper starting point c to the axis of rotation 111 such that at least 2/3 of the outer edge 121 is The gap between the side walls 22 of the frame 2 is larger than the first gap g1 to ensure that the fan wheel 1 can effectively suppress the pressure change formed by the airflow on the air outlet side of the air passage 23.

On the other hand, referring to Fig. 8, the fan wheel 1 of another embodiment of the axial flow fan of the present invention is different from the fan wheel 1 of the foregoing embodiment in that the outer edge of any of the blades 12 is The tapping starting point c of 121 is the outlet end b of the outer side edge 121 of the blade 12. Accordingly, the distance from the outer side edge 121 of the blade 12 to the axis of rotation 111 is tapered by the outlet end b toward the inlet end a. Thereby, the distance from the portion of the outer edge 121 other than the outlet end b to the rotation axis 111 is smaller than the distance d1 from the outlet end point b to the rotation axis 111, so the outer edge 121 is apart from the outlet. The gap between the portion other than the end point b and the side wall 22 of the fan frame 2 is larger than the first gap g1, and the pressure variation effect of the fan wheel 1 on the air outlet side of the air passage 23 can be enhanced. .

In addition, as shown in FIG. 9, the fan wheel 1 of the axial fan of the present invention is different from the fan wheel 1 of the foregoing embodiments in that the outer edge 121 has another a tapered end point e, the tapered end point e is located between the inlet end point a and the tapered starting point c, and the distance d4 from the tapered end point e to the axis of rotation 111 is equal to the incoming wind The distance d2 from the end point a to the axis of rotation 111. In other words, the distance d3 from the tapping starting point c to the axis of rotation 111 is greater than the distance d4 from the tapping end point e to the axis of rotation 111. The distance from the outer side edge 121 of the blade 12 to the axis of rotation 111 is tapered by the tapered starting point c towards the tapered end point e. By setting the tapered end point e, the distance from the outer side edge 121 of the blade 12 to the rotational axis 111 can be reduced to a minimum value (distance d2, d4) before the air inlet end point a.

In summary, each embodiment of the axial flow fan of the present invention and the fan wheel 1 thereof have a distance d3 from the tapered starting point c of the outer edge 121 of each of the blades 12 to the rotation axis 111 being greater than the inlet air thereof. The distance d2 from the end point a to the rotation axis 111 is such that the gap between the side wall 22 of the fan frame 2 and the outer side edge 121 of each of the blades 12 is from the tapered starting point c toward the inlet end point a. When the fan wheel 1 is driven to generate airflow, the pressure change formed by the airflow on the air outlet side of the air passage 23 is effectively suppressed, thereby achieving the effect of reducing the running noise of the axial fan. Furthermore, the axial fan embodiment of the present invention and its fan wheel 1 do not adversely affect the performance of the fan, and the air volume and wind pressure of the axial fan can be further improved.

Although the present invention has been disclosed using the above preferred embodiments, it is not intended to be limiting The invention is not limited to the spirit and scope of the present invention, and various modifications and changes to the above embodiments are still within the technical scope of the present invention. Therefore, the scope of protection of the present invention is attached. The scope defined in the scope of application for patent application shall prevail.

1‧‧‧fan wheel

11‧‧·wheels

111‧‧‧Rotation axis

12‧‧‧ fan leaves

121‧‧‧ outside edge

a‧‧‧Inlet terminal

b‧‧‧Outlet end

c‧‧‧Starting point

D1‧‧‧ distance

D2‧‧‧ distance

D3‧‧‧ distance

Claims (6)

An axial flow fan comprising: a fan wheel having a hub and a plurality of blades, the hub having an axis of rotation, the plurality of blades being coupled to the hub, each of the blades being at the wheel Radially having an outer edge, the outer edge of the fan wheel at both ends of the fan wheel is an air inlet end and an air outlet end, the outer edge further has a tapered starting point, the taper start a distance from the point of rotation to the axis of rotation is greater than a distance from the end of the wind inlet to the axis of rotation; a frame having a base and a side wall, the base being rotatably coupled to the fan wheel, the side The wall surrounds a driving passage to receive the fan wheel, and the side wall forms a first gap between the tapered starting points of the outer edge, and the side wall reaches between the air inlet ends of the outer edge Forming a second gap, the ratio of the second gap divided by the first gap is 1.5 to 2.5; and a driving component, the driving component has an exciting component and a magnetic sensing component, and the exciting component is disposed on the fan wheel One of the hub and the base, the magnetic sensing member is disposed on the hub and the other of the base. The axial flow fan of claim 1, wherein the ratio of the second gap divided by the first gap is 1.9 to 2.1. The axial flow fan of claim 1, wherein the length of the outer edge from the tapered starting point to the end of the air inlet is at least 2/3 of the total length of the outer edge. The axial flow fan of claim 1, wherein the tapping starting point is located between the air inlet end point and the air outlet end point, and the distance from the tapping starting point to the rotating axis is Equal to the distance from the exit end to the axis of rotation. The axial flow fan according to claim 1, wherein the taper starting point of the outer side edge of any one of the blades is an air outlet end of the outer edge of the blade. An axial flow fan according to claim 1, wherein the outer side of any one of the blades is The edge further has a tapered end point located between the air inlet end point and the tapered starting point, and the distance from the tapering end point to the rotation axis is equal to the air inlet end point to the The distance from the axis of rotation.