TWI414681B - Impeller - Google Patents

Abstract

An impeller comprises a hub and a plurality of blades, the blades are arranged on the outer circumference of the hub. Each blade has a lead surface and a trail surface. The peripheral edge of each blade forms a lead edge, a trail edge and a radial edge, the radial edge is positioned on the free end of the blade. Otherwise, each blade has at least one guiding groove, the guiding groove is formed on at least one of the lead surface and the trail surface of the blade, and adjacent to the radial edge of the blade. The guiding groove extends from the lead edge to the trail edge. With each blade forming the guiding groove, the turbulence near the radial edge and air-noise can be reduced.

Description

Axial fan fan wheel

The present invention relates to a fan wheel, and more particularly to a fan wheel capable of reducing eddy currents and reducing fan running noise.

A conventional fan wheel system is disposed in a fan unit. Referring to FIG. 1 , a conventional fan wheel 8 is disclosed. The wheel hub 81 includes a hub 81 and a plurality of blades 82. The hub 81 is provided with a rotating shaft 811. As a pivot point. The plurality of blades 82 are arranged at equal intervals on the outer circumferential surface of the hub 81. Each of the blades 82 has a windward side edge 821, an air outlet side edge 822 and a radial end edge 823. When the conventional fan wheel 8 is in operation, outside air is received from the windward side edge 821 of each of the blades 82. The axial suction is performed, and after passing through each of the blades 82, it is sent out through the air outlet side edges 822 of the blades 82, thereby achieving the purpose of dissipating heat from the wind.

Referring to FIG. 2, since the conventional fan wheel 8 is a fan wheel of an axial flow fan, each of the blades 82 is disposed obliquely with respect to the axial direction, so that the direction of the wind is corresponding to the rotation axis 811. Axial access. However, as the airflow passes between the blades 82, a portion of the airflow tends to leak out of the radial end edge 823 along the lateral direction of each of the blades 82, resulting in a lateral leakage of the outer leakage at the radial end. The 823 position generates eddy currents and airflow disturbances, which in turn causes the fan to operate at too high a noise level and at the same time affect its heat dissipation performance.

In view of the above, in order to overcome the disadvantages of the above-described conventional fan wheel 8, another conventional fan wheel 9, please refer to FIG. 3, the invention patent of the "fan blade flow guiding structure" of the Republic of China Publication No. 200823372, which includes a The hub 91 and the plurality of blades 92 are arranged at equal intervals on the outer circumferential surface of the hub 91. The blade 92 has a windward side edge 921, an air outlet side edge 922 and a radial end edge 923. The conventional fan wheel 9 is mainly provided with a guide plate 93 attached to the surface of the blade 92. The guide plate 93 is selected from a circular arc plate adjacent to the radial end edge 923 and perpendicular to the surface of the blade 92.

When the conventional fan wheel 9 is in operation, the outside air is axially drawn from the windward side edge 921 of each of the blades 92, and when the airflow passes through the surface of each of the blades 92, it is laterally toward the radial end edge 923 due to centrifugation. The flowing part of the airflow is blocked by the guide plate 93 and is guided to flow toward the air outlet side edge 922, thereby avoiding lateral overflow of the airflow to further enhance the air blowing performance and reduce the overall noise.

However, as the size of the fan is miniaturized, the size of the fan member also needs to be further miniaturized. Since the conventional fan 9 mainly selects the guide plate 93 to prevent the lateral overflow of the airflow, the The arrangement of the guide plate 93 relative to the surface of the blade 92 instead causes the axial height of the conventional fan wheel 9 to be too high. The fan frame must have a proper space for the size of the guide plate 93 to avoid the practice. It is known that the fan wheel 9 does not collide with the fan frame during operation, which is not conducive to the fabrication and application of the micro fan.

Moreover, the arrangement of the guide plate 93 simultaneously causes an increase in the overall weight of the conventional fan wheel 9, and in particular, an increase in the weight of the fan wheel causes an increase in power consumption of the fan device, resulting in a more energy-consuming fan device. Moreover, the addition of the guide plate 93 additionally increases the cost of the original material of the conventional fan wheel 9 at the time of manufacture, so that the manufacturing cost is increased. For the above reasons, the aforementioned conventional fan wheel 9 does have a need for improvement.

The invention provides a fan wheel, which mainly reduces the eddy current effect generated at the end edge when the airflow passes through the fan wheel, so as to reduce the running noise, which is the object of the invention.

The present invention provides a fan wheel which has a lightweight characteristic and can effectively reduce the load of the fan operation to reduce the running energy consumption, and is another object of the present invention.

The present invention provides a fan wheel which can be applied to a miniaturized fan, which is advantageous for reducing the size of the fan, and is a further object of the present invention.

The invention provides a fan wheel, which is effective for reducing the cost of manufacturing materials, so as to reduce the production cost, and is another object of the invention.

In order to achieve the foregoing object, the technical means and the efficiencies achievable by the technical method include: a fan wheel comprising a hub and a plurality of blades, the plurality of blades being disposed outside the hub surface. Each of the blades has a windward surface and a leeward surface, and each of the blades has a windward side edge, an air outlet side edge and a radial end edge formed at a free end of the blade. Each of the blades is provided with at least one guiding groove disposed on at least one surface of the windward surface and the leeward surface, and adjacent to the radial end edge, the guiding groove is from the windward side The edge extends toward the side edge of the wind outlet.

The invention mainly utilizes the guiding groove to reduce the lateral overflow of the fan blade to reduce the occurrence of eddy current between the fan frame and the blade end, thereby effectively reducing the generation of the fan at a specific frequency during operation. The maximum amount of noise, as well as the overall wind noise of the fan.

The above and other objects, features and advantages of the present invention will become more <RTIgt; <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The fan wheel of the first embodiment of the present invention is mainly applied to a fan device 7 (as shown in FIG. 8), and the fan device 7 is preferably an axial fan including a hub 1 and a plurality of The blade 2 has a hollow cylindrical shape, and the plurality of blades 2 are arranged in an outer circumferential surface of the hub 1, and each of the blades 2 is disposed obliquely with respect to an axial direction of the hub 1.

The hub 1 is provided with a top cover portion 11, a ring wall portion 12 and a rotating shaft 13. The ring wall portion 12 is looped on the outer periphery of the top cover portion 11, and the top cover portion 11 and the ring wall portion 12 are common. A accommodating space 14 is formed around the accommodating space 14 for a ring magnet (not shown) to be assembled and embedded. The rotating shaft 13 is located in the accommodating space 14 and correspondingly disposed at a central position of the top cover portion 11.

The opposite surfaces of the blades 2 are respectively a windward surface 21 and a leeward surface 22, and the windward surface 21 is a surface of the blade 2 facing the air inlet (not shown) of the fan device 7, and the leeward surface 22 is The blade 2 faces the surface of the air outlet (not shown) of the fan unit 7 (please refer to Fig. 8). Further, each of the blades 2 is formed with a windward side edge 23, an air outlet side edge 24 and a radial end edge 25, and the windward side edge 23 and the air outlet side edge 24 are respectively formed on the windward surface 21 and the leeward side. The 22-phase joint position, wherein the windward side edge 23 is adjacent to the top cover portion 11 of the hub 1, and the wind outlet side edge 24 is adjacent to the bottom of the ring wall portion 12. The radial end edge 25 is formed at one end of the blade 2 away from the hub 1, and the end is also a free end. The contour of the radial end edge 25 is preferably a streamlined arc design, thereby reducing the blade. 2 Wind noise generated during operation.

As shown in the fifth and sixth embodiments, each of the blades 2 is further provided with at least one guiding groove 26, and the guiding groove 26 can be selectively disposed on at least one surface of the windward surface 21 and the leeward surface 22, The embodiment selects the guide groove 26 on the leeward surface 22 as an embodiment. The guiding groove 26 is preferably located between the windward side edge 23 and the wind outlet side edge 24, and the two ends of the guiding groove 26 of the embodiment remain with the windward side edge 23 and the windward side edge 24 There is a separation distance. The guiding groove 26 is disposed in the radial direction near the radial end edge 25, and the direction of the guiding groove 26 extends from the windward side edge 23 toward the wind outlet side edge 24, and the guiding groove 26 is also Correspondingly disposed on one side of the radial end edge 25, a predetermined spacing is maintained between the radial end edge 25. Moreover, the guiding groove 26 of the present embodiment is selected as an arc-shaped groove, and the cross-sectional shape thereof is a semi-arc shape (as shown in FIG. 8).

Referring to Figures 7 and 8, when the fan wheel of the present invention is actually used on the fan unit 7, the outside air is drawn into between the blades 2 via the windward side edge 23 as the fan wheel rotates. When the airflow passes through the surfaces of the blades 2, a portion of the airflow flows along the windward surface 21 of the blade 2 and the leeward surface 22 of the adjacent blade 2 toward the wind outlet side edge 24, and directly from the air outlet of the fan unit 7. Discharge; another portion of the airflow will flow laterally toward the radial end edge 25 due to centrifugation. Since the leeward surface 22 is provided with the guiding groove 26, when a part of the airflow flows laterally along the windward surface 21 toward the radial end edge 25, the lateral airflow is guided by the guiding groove 26. The guide groove 26 flows along the outlet side edge 24 . At the same time, the airflow flowing along the guiding groove 26 also forms a guiding airflow to draw the lateral airflow toward the air outlet side edge 24. Thereby, the airflow is prevented from overflowing from the side of the radial end edge 25, thereby reducing the eddy current effect between the fan frame 71 and the blade 2 of the fan device 7, effectively improving the air blowing efficiency and reducing the overall operation of the fan. noise.

Referring to Table 1, it is applied to the axial fan of the fan wheel and the conventional fan wheel 8 of the present invention, and the actual test is carried out under the operating environment of 3200 rpm and 3700 rpm. Among them, as can be seen from Table 1, the fan tested with the fan wheel of the present invention generates a maximum noise of 21.53 decibels at a rotational speed of 3200 rpm and a frequency of 372 Hz; and, at a rotational speed of 3700 rpm and a frequency of 431. A maximum noise level of 19.28 dB is produced at Hz.

In contrast, a fan tested with the conventional fan wheel 8 produces a maximum noise level of 26.13 dB at 3200 rpm and a frequency of 373 Hz; and 26.70 at a speed of 3700 rpm and a frequency of 432 Hz. The maximum amount of noise in decibels. In comparison, the maximum noise generated by the fan wheel of the present invention relative to the conventional fan wheel 8 at a rotational speed of 3,200 rpm is effectively reduced by 4.6 decibels (a reduction of approximately 16.7%); and at a rotational speed of 3,700 rpm. The maximum noise is significantly reduced by 7.42 decibels (approximately 27.8% reduction).

The main technical feature of the present invention is that the at least one guiding groove 26 is disposed on at least one surface of the windward surface 21 and the leeward surface 22 of the blade 2, and the guiding groove 26 is adjacent to the radial edge. The guide groove 26 is used to guide the lateral airflow to flow toward the wind outlet side edge 24. Thereby, the airflow is prevented from overflowing laterally from the radial end edge 25, and the eddy current effect generated between the fan frame 71 and the blade 2 is reduced, so that the fan wheel of the present invention can effectively reduce the specificity of the fan device 7 during operation. The maximum amount of noise generated at the frequency, as well as the overall wind-cut noise of the fan.

Moreover, since the guiding groove 26 is concave with respect to the windward surface 21 or the leeward surface 22 of the blade 2, the overall volume of the fan wheel of the present invention is reduced, thereby being lighter than the conventional fan wheels 8, 9. Quantification to reduce the load of the fan operation, thereby achieving the purpose of energy saving and reducing the cost of raw materials.

Moreover, the guiding groove 26 which is concavely disposed with respect to the windward surface 21 or the leeward surface 22 does not additionally increase the axial height of the fan wheel, so that the space for accommodating and rotating the fan wheel of the present invention can be minimized. This facilitates the miniaturization of the fan unit 7.

Referring to FIGS. 9 and 10, a fan wheel according to a second embodiment of the present invention is disclosed. Compared with the first embodiment, the two ends of the guiding groove 26 of the second embodiment are connected to the windward side edge. 23 and the outlet side edge 24, whereby when outside air is drawn into between the blades 2 via the windward side edge 23, part of the airflow can directly enter the guiding groove 26 via the windward side edge 23, and The outlet side edge 24 flows through the gas in the guiding groove 26 The flow and guide groove 26 itself is formed with a recess designed to direct the lateral flow of air toward the radial end edge 25, allowing the lateral flow to flow along the guide groove 26 toward the outlet side edge 24, reducing The lateral airflow leaks from the radial end edge 25, thereby avoiding a vortex effect between the fan frame 71 and the blade 2, further reducing the overall running noise of the fan.

Referring to FIG. 11 , a fan wheel according to a third embodiment of the present invention is disclosed. Compared with the first embodiment, each of the leeward faces 22 of the third embodiment is provided with a guiding groove 26 and an auxiliary guide. a guiding groove 26 ′ is disposed between the radial end edge 25 and the auxiliary guiding groove 26 ′, wherein the guiding groove 26 has a configuration substantially the same as that in the first embodiment. The guiding groove 26 is not described in detail herein. In addition, the auxiliary guiding grooves 26' are juxtaposed on one side of the auxiliary guiding groove 26, and the auxiliary guiding groove 26' is disposed in a direction similar to the guiding groove 26.

In addition, the two ends of the auxiliary guiding groove 26' also have a separation distance from the windward side edge 23 and the air outlet side edge 24, but the length of the guiding groove 26 is larger than the auxiliary guiding groove 26'. The length of the auxiliary guiding groove 26' is opposite to the windward side edge 23 and the air outlet side edge 24 by a distance greater than the two ends of the guiding groove 26 relative to the windward side edge 23 and the wind side. The separation distance between the edges 24.

In this embodiment, by the side of the leeward surface 22 adjacent to the radial end edge 25, the guiding groove 26 and the auxiliary guiding groove 26' are arranged side by side, so that a part of the airflow flowing along the lateral direction of the leeward surface 22 can be During the lateral flow, the guide groove 26 and the auxiliary guide groove 26' are continuously stopped and guided, and then flow toward the air outlet side edge 24, further ensuring that the lateral airflow does not The radial end edge 25 is laterally overflowed to reduce the fan frame 71 and the blade 2 A vortex is generated between them, thereby reducing the maximum wind cut noise and the overall running noise generated by the fan unit 7 at a specific frequency.

Referring to FIG. 12, a fan wheel according to a fourth embodiment of the present invention is disclosed. Compared with the first embodiment, the guide groove 26 of the fourth embodiment is selectively disposed on the windward surface 21 of the blade 2, wherein The guiding groove 26 is disposed between the windward side edge 23 and the wind outlet side edge 24, and is located radially adjacent to the radial end edge 25, and has a configuration substantially the same as that in the first embodiment. The groove 26 is not described in detail herein.

The guiding groove 26 of the embodiment is disposed on the windward surface 21, which can still achieve the same effect as the first embodiment of the present invention, and can further reduce the eddy current effect generated between the fan frame 71 and the blade 2, Reduce the overall running noise of the fan. In summary, the guiding groove 26 of the present invention is disposed on the windward surface 21 or the leeward surface 22 of each of the blades 2, or is disposed on the windward surface 21 and the leeward surface 22 at the same time, and even changes only the guide. The number of the guide grooves 26 is within the technical scope of the present invention, and is not limited to the many uses of the foregoing embodiments.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

[this invention]

1. . . Wheel hub

11. . . Top cover

12. . . Ring wall

13. . . Rotary axis

14. . . Housing space

2. . . blade

twenty one. . . Windward side

twenty two. . . Leeward side

twenty three. . . Windward side

twenty four. . . Outer side

25. . . Radial edge

26. . . Guide groove

26’. . . Auxiliary guiding groove

7. . . Fan unit

71. . . Fan frame

[知知]

8. . . Conventional fan wheel

81. . . Wheel hub

811. . . Rotary axis

82. . . blade

821. . . Windward side

822. . . Outer side

823. . . Radial edge

9. . . Conventional fan wheel

91. . . Wheel hub

92. . . blade

921. . . Windward side

922. . . Outer side

923. . . Radial edge

93. . . Guides

Figure 1: A perspective view of a conventional fan wheel.

Figure 2: Schematic diagram of the side view and gas flow direction of the conventional fan wheel.

Figure 3: A perspective view of another conventional fan wheel.

Fig. 4 is a perspective view of a fan wheel according to a first embodiment of the present invention.

Fig. 5 is a partially enlarged view of the fan wheel of the first embodiment of the present invention.

Fig. 6 is a cross-sectional view of the fan wheel blade of the first embodiment of the present invention taken along line 6-6 of Fig. 5.

Fig. 7 is a schematic view showing the flow of the airflow along the leeward side of the blade in the first embodiment of the present invention.

Fig. 8 is a schematic cross-sectional view showing the fan wheel of the first embodiment of the present invention applied to a fan unit and a gas flow direction.

Figure 9 is a partial enlarged view of a fan wheel of a second embodiment of the present invention.

Figure 10 is a cross-sectional view of the fan wheel blade of the second embodiment of the present invention taken along line 10-10 of Figure 9.

Figure 11 is a partial enlarged view of a fan wheel of a third embodiment of the present invention.

Figure 12 is a perspective view of a fan wheel of a fourth embodiment of the present invention.

1. . . Wheel hub

11. . . Top cover

12. . . Ring wall

13. . . Rotary axis

14. . . Housing space

2. . . blade

twenty two. . . Leeward side

twenty three. . . Windward side

twenty four. . . Outer side

25. . . Radial edge

26. . . Guide groove

Claims (18)

A fan wheel of an axial flow fan, comprising: a hub having a ring wall portion; and a plurality of blades disposed on an outer peripheral surface of the ring wall, each of the blades having a windward surface and a leeward surface, and each of the blade peripheral edges Forming a windward side edge, an air outlet side edge and a radial end edge formed at one end of the blade away from the hub; wherein each of the blades is provided with at least one guiding groove, the guiding groove The groove is disposed on at least one surface of the windward surface and the leeward surface, and adjacent to the radial end edge, the guiding groove extends from the windward side edge toward the windward side edge. The fan wheel of the axial flow fan according to claim 1, wherein the guiding groove is concave with respect to the windward or leeward side of the blade. The fan wheel of the axial flow fan according to claim 1 or 2, wherein the guiding groove is disposed between the windward side edge and the wind outlet side edge, and the two ends of the guiding groove are respectively There is a separation distance from the windward side edge and the wind side edge. The fan wheel of the axial flow fan according to claim 1 or 2, wherein the two ends of the guiding groove communicate with the windward side edge and the air outlet side edge of the blade. The fan wheel of the axial flow fan according to claim 1 or 2, wherein the guiding groove is disposed on one side of the radial end edge, and the guiding groove and the radial end edge There is a predetermined spacing between them. A fan wheel of an axial flow fan according to claim 1 or 2 of the patent application, The guiding groove is an arc-shaped groove, and the cross-sectional shape thereof is a semi-arc shape. The fan wheel of the axial flow fan according to claim 2, wherein the blade is further provided with an auxiliary guiding groove, and the guiding groove is disposed between the radial edge and the auxiliary guiding groove. . The fan wheel of the axial flow fan according to the seventh aspect of the invention, wherein the guiding groove and the auxiliary guiding groove are juxtaposed on the windward or leeward side. The fan wheel of the axial flow fan according to claim 7 or 8, wherein the guiding groove and the auxiliary guiding groove are located between the windward side edge and the wind outlet side edge, and the guiding The length of the groove is greater than the length of the auxiliary guiding groove. A fan of an axial flow fan, comprising a hub and a plurality of blades, the blades are disposed obliquely on a peripheral surface of the hub, each blade having a windward surface, a leeward surface and a radial end edge, wherein: Each of the blades is provided with at least one guiding groove, the guiding groove is disposed on at least one surface of the windward surface and the leeward surface, and the guiding groove is adjacent to the radial end edge, and the guiding groove is opposite to the guiding groove The windward or leeward side is concave. The fan wheel of the axial flow fan according to claim 10, wherein each of the peripheral edges of the blade is further formed with a windward side edge and an air outlet side edge, and the guiding groove is directed toward the windward side edge The wind side edge extends. The fan wheel of the axial flow fan according to claim 11, wherein the guiding groove is disposed between the windward side edge and the wind outlet side edge, and the two ends of the guiding groove are respectively There is a separation distance between the windward side edge and the wind side edge. The fan wheel of the axial flow fan according to claim 11, wherein the two ends of the guiding groove are connected to the windward side edge and the air outlet side edge of the blade. The fan wheel of an axial flow fan according to claim 10, 11, 12 or 13 wherein the guiding groove is disposed on one side of the radial end edge, and the guiding groove and the diameter A predetermined spacing is maintained between the end edges. The fan wheel of an axial flow fan according to claim 10, 11, 12 or 13, wherein the guide groove is an arc-shaped groove, and the cross-sectional shape thereof is a semi-arc shape. The fan wheel of the axial flow fan according to claim 11, wherein the fan blade is further provided with an auxiliary guiding groove, and the guiding groove is disposed at the radial end edge and the auxiliary guiding groove. between. The fan wheel of the axial flow fan according to claim 16, wherein the guiding groove and the auxiliary guiding groove are juxtaposed on the windward or leeward side. The fan wheel of an axial flow fan according to claim 16 or 17, wherein the guiding groove and the auxiliary guiding groove are located between the windward side edge and the wind outlet side edge, and the guiding The length of the groove is greater than the length of the auxiliary guiding groove.