TWI667417B - Multi-wing fan - Google Patents

Abstract

A multi-blade fan includes: a frame having an air inlet, an air outlet, and an accommodating space, the air inlet and the air outlet are connected to the accommodating space; and a fan wheel, the fan The wheel is rotatably disposed in the accommodating space, the fan wheel includes a hub and a plurality of blades, the plurality of blades are disposed on a periphery of the hub, and the plurality of blades respectively have an inner end and an outer end The fan wheel system defines a hurricane range, and the outer circumference of the hurricane range passes through the inner end of the plurality of blades, and the range covered by the air inlet is located in the hurricane range Within the scope covered, thereby enhancing the wind guiding effect of the fan.

Description

Multi-wing fan

The present invention relates to a multi-blade fan, and more particularly to a multi-blade fan that allows airflow to enter and exit the blade more smoothly.

Referring to FIG. 1 , a fan 9 is disclosed. The fan 9 includes a frame 91 and a fan wheel 92 . The fan frame 91 has an air inlet 911 and an air outlet 912 . The fan wheel 92 can be It is rotatably disposed in the fan frame 91. Therefore, when the fan wheel 92 rotates in the fan frame 91, the plurality of blades 921 of the fan wheel 92 can draw the airflow from the air inlet 911 into the fan frame 91, and drive the fan frame 91. The airflow flows out toward the air outlet 912 to achieve the purpose of driving the wind.

When the fan 9 is a centrifugal fan, the air inlet 911 is generally an axial air inlet, and the air outlet 912 is generally a radial air outlet, that is, the plurality of blades 921 of the fan wheel 92 drive the airflow toward the When the air outlet 912 flows out, the driven air flow will leave the plurality of blades 921 in a radial direction.

Referring to FIG. 2, when the opening of the air inlet 911 is too large, a part of the structure of the plurality of blades 921 falls within the range covered by the air inlet 911 in the projection in the axial direction, and The airflow passing through the air inlet 911 enters the plurality of blades 921 in the axial direction and the radial direction at the same time, so that not only the airflow cannot flow smoothly into and out of the plurality of blades 921 in the same direction, and The airflow in different directions also forms turbulence and vortex between the plurality of blades 921, thereby reducing the wind guiding capability of the fan.

In view of this, the present invention provides a multi-blade fan to solve the conventional fan The problem of poor wind guiding ability.

The object of the present invention is to provide a multi-blade fan, wherein the air inlet of the multi-blade fan does not extend beyond the inner end of the plurality of blades, so that the airflow can smoothly enter and exit the blade, and has the effect of improving the air guiding capability.

In order to achieve the foregoing object, the multi-blade fan of the present invention comprises: a frame having an air inlet, an air outlet and an accommodating space, wherein the air inlet and the air outlet communicate with the accommodating space And a fan wheel, the fan wheel is rotatably disposed in the accommodating space, the fan wheel includes a hub and a plurality of blades, the plurality of blades are disposed on a periphery of the hub, and the plurality of blades are respectively a windward surface having an inner end, an outer end, and a concave curved surface, wherein the windward surface of each of the plurality of vanes is located between the inner end and the outer end, the windward mask has a center of curvature, and each of the vanes a line connecting the center of curvature and the respective inner end and the outer end forms a blade arc angle, the blade arc angle being between 130 degrees and 170 degrees, and the inner end of each of the blades is connected to the center of the hub The wire system forms a first reference line, and the tangent line of the windward surface of the blade adjacent to the inner end extends to form a second reference line, and the first reference line forms a set angle with the second reference line, the setting Angle between 40 degrees and 80 degrees The fan wheel system defines a hurricane range, and the outer circumference of the hurricane range passes through the inner end of the plurality of blades, and the range covered by the air inlet is located in the hurricane Within the scope of the range, the air inlet has a maximum diameter in a radial direction, the hurricane range can form a reference circle in the radial direction, and the reference circle has a reference diameter, the maximum diameter and The ratio of the reference diameters is greater than 0.7 and less than 0.85. Thereby, not only the airflow can flow smoothly into and out of the plurality of blades in the radial direction, but also the airflow can be prevented from forming turbulence and vortex between the plurality of blades, thereby improving the air guiding capability of the fan. .

Wherein, the curvature of the windward surface of the plurality of blades is the same. Thereby, the windward surface of the plurality of blades can be adapted to the inflow direction of the airflow in a preferred direction to avoid airflow in the Turbulence and vortex are formed between several blades, which has the effect of improving the wind guiding ability of the fan.

Wherein, the center of the hub faces the air inlet in an axial direction. Thereby, the position of the air inlet and the fan wheel can be made to correspond to each other, and the airflow passing through the air inlet can be uniformly flowed to the fan wheel, thereby having the effect of improving the air guiding capability of the fan.

Wherein, the center of the hub is directly at the center of the air inlet. Thereby, the position of the air inlet and the fan wheel can be made to correspond to each other, and the airflow passing through the air inlet can be uniformly flowed to the fan wheel, thereby having the effect of improving the air guiding capability of the fan.

The air inlet has a flow guiding portion protruding from the periphery of the air inlet into the accommodating space. Thereby, the flow guiding portion can smoothly enter the accommodating space from the air inlet through the air inlet, and has the effect of improving the air guiding capability of the fan.

〔this invention〕

1‧‧‧Fan frame

11‧‧‧Air inlet

111‧‧‧Drainage Department

12‧‧‧air outlet

13‧‧‧ accommodating space

2‧‧‧fan wheel

21‧‧·wheels

22‧‧‧ blades

22a‧‧‧ Windward side

221‧‧‧Inside

222‧‧‧Outside

C‧‧‧ Hurricane Range

D1‧‧‧Max caliber

D2‧‧‧ reference diameter

O‧‧‧ Curvature Center

R1‧‧‧ first curve

R2‧‧‧ second curve

θ 1‧‧‧blade angle

θ 2‧‧‧Set the angle

[study]

9‧‧‧Fan

91‧‧‧Fan frame

911‧‧‧ inlet

912‧‧ vents

92‧‧‧ fan leaves

921‧‧‧ leaves

Figure 1: Schematic diagram of the structure of the known fan.

Figure 2: Schematic diagram of the airflow path of a known fan.

Figure 3 is a schematic view showing the structure of the multi-blade fan of the present invention.

Figure 4: Top view of the multi-blade fan of the present invention.

Figure 5: Schematic diagram of the airflow path of the multi-blade fan of the present invention.

Fig. 6 is a schematic view showing the blade arc angle of the multi-blade fan of the present invention.

Figure 7 is a schematic view showing the arrangement angle of the multi-blade fan of the present invention.

Figure 8 is a schematic view of the blade and airflow path of the multi-wing fan of the present invention.

Figure 9: Fan running test curve.

The above and other objects, features and advantages of the present invention will become more <RTIgt; As shown, the multi-wing fan of the present invention includes a fan Box 1 and a fan wheel 2, the fan wheel 2 is disposed in the fan frame 1.

The fan frame 1 has an air inlet 11 , an air outlet 12 , and an accommodating space 13 . The air inlet 11 and the air outlet 12 communicate with the accommodating space 13 , and in a radial direction, the air inlet 11 Has a maximum diameter D1. In this embodiment, the air inlet 11 may have a circular shape in the radial direction, and the maximum diameter D1 may be regarded as one of the diameters of the air inlet 11 . Moreover, the air inlet 11 has a flow guiding portion 111 which protrudes from the periphery of the air inlet 11 into the accommodating space 13. Thereby, the flow guiding portion 111 allows the airflow to enter the accommodating space 13 more smoothly from the air inlet 11 and has the effect of improving the air guiding capability of the fan.

The fan wheel 2 is rotatably disposed in the accommodating space 13 . The fan wheel 2 includes a hub 21 and a plurality of blades 22 . The plurality of blades 22 are disposed on the outer periphery of the hub 21 , and the plurality of blades 22 has an inner end 221 and an outer end 222 respectively. The inner end 221 of the plurality of blades 22 is oriented toward the center of the hub 21, and the outer end 222 of the plurality of blades 22 is facing away from the center of the hub 21. The fan wheel 2 defines a hurricane range C, and the outer circumference of the hurricane range C passes through the inner end 221 of the plurality of blades 22, and the range covered by the air inlet 11 is in the projection in an axial direction. Located within the range covered by this hurricane range C. Thereby, the opening of the air inlet 11 can be prevented from being excessively large, and the airflow can be passed through the fan wheel 2 in a smoother manner, thereby having the effect of improving the air guiding capability of the fan.

Wherein, the center of the hub 21 faces the air inlet 11 in an axial direction, or as shown in this embodiment, the center of the hub 21 is directly opposite to the center of the air inlet 11. Thereby, the position of the air inlet 11 and the fan wheel 2 can be made to correspond to each other, and the airflow passing through the air inlet 11 can be uniformly flowed to the fan wheel 2, which has the effect of improving the air guiding capability of the fan.

Moreover, when the plurality of blades 22 are disposed on the outer circumference of the hub 21 in a circumferential direction, the hurricane range C may form a reference circle in the radial direction, and the reference circle has a reference diameter D2. In the case where the air inlet 11 has the maximum aperture D1, the ratio of the maximum aperture D1 to the reference diameter D2 is greater than 0.5 and less than 0.85. By this, you can avoid this entry. The opening of the tuyere 11 is too large, so that the airflow can pass through the fan wheel 2 in a smoother manner, and has the effect of improving the wind guiding capability of the fan.

Please refer to FIGS. 4 and 5 at the same time. In more detail, when the ratio of the maximum diameter D1 of the air inlet 11 to the reference diameter D2 of the fan wheel 2 is greater than 0.5 and less than 0.85, the maximum can be made. The aperture D1 maintains a specific ratio with the reference diameter D2 to prevent the maximum diameter D1 of the air inlet 11 from being excessively large, thereby adjusting the direction in which the airflow enters the plurality of blades 22. Further, in the projection of the axial direction, since the range covered by the air inlet 11 is within the range covered by the hurricane range C, the airflow passing through the air inlet 11 does not immediately contact the plurality of airflows. During the flow of the airflow from the air inlet 11 to the plurality of blades 22, the flow direction of the airflow itself gradually changes from the axial direction to the radial direction, thereby allowing the airflow to flow in the radial direction. The plurality of blades 22 flow out of the plurality of blades 22 in the radial direction. Thereby, not only the airflow can flow smoothly into and out of the plurality of blades 22 in the radial direction, but also the airflow can be prevented from forming turbulence and vortex between the plurality of blades 22, thereby improving the air guiding capability of the fan. Effect.

As shown in FIG. 6, the plurality of blades 22 respectively have a windward surface 22a, and the windward surface 22a of each of the plurality of blades 22 is located between the inner end 221 and the outer end 222, in this embodiment. The windward surface 22a of the plurality of blades 22 is a concave curved surface, and the curvature of the windward surface 22a of the plurality of blades 22 is the same.

More specifically, the windward surface 22a of each of the blades 22 may have a center of curvature O due to its own curvature, and the center of curvature O of each of the blades 22 is connected to the respective inner end 221 and the outer end 222. A blade arc angle θ 1 is formed, which is between 130 degrees and 170 degrees.

Referring to FIG. 7, the connection between the inner end 221 of each of the blades 22 and the center of the hub 21 forms a first reference line, and the windward side of each of the blades 22 adjacent to the inner end 221 The tangent line of 22a extends to form a second reference line, and the first reference line forms a set angle θ 2 with the second reference line, and the set angle θ 2 is between 40 degrees and 80 degrees. between.

Referring to FIGS. 4 and 8 simultaneously, when the hub 21 rotates, the plurality of blades 22 can rotate synchronously with the hub 21, and when the airflow is to flow into the plurality of blades 22 in the radial direction, When the blade arc angle θ 1 of the plurality of blades 22 is between 130 degrees and 170 degrees, and the set angle θ 2 of the plurality of blades 22 is between 40 degrees and 80 degrees, the plurality of blades 22 The windward surface 22a can meet the inflow direction of the airflow in a better arcing direction, and can not only make the airflow hit the windward surface 22a in a smoother manner, so as to prevent the airflow from forming turbulence between the plurality of blades 22. The vortex allows the airflow to smoothly flow out of the blade 22 along the arc of the windward surface 22a, thereby having the effect of enhancing the wind guiding capability of the fan.

In order to prove that the multi-blade fan of the present invention does have the effect of improving the air guiding capability, the following is a running test of the multi-blade fan of the present invention and a conventional fan. In the running test, the conventional fan and the present invention are used. The multi-blade fan has a similar fan frame 1 and the fan wheel 2, and the ratio of the maximum diameter of the air inlet of the conventional fan to the reference diameter of the fan wheel is 1; in addition, the multi-blade fan of the present invention The ratio of the maximum diameter D1 of the air inlet 11 to the reference diameter D2 of the fan wheel 2 is 0.7. Please refer to Figure 9, the horizontal coordinate of the test result is a wind volume (unit: CMM), and the ordinate is a full pressure efficiency (unit: %), wherein the total pressure efficiency (%) = aerodynamics (kw) / Fan shaft power (kw). The operation test result of the multi-wing fan of the present invention is represented as a first curve R1, and the operation test result of the conventional fan is expressed as a second curve R2, which is known from the figure 9 at a low air volume (less than 20 CMM). In the operating environment, the full-pressure efficiency of the multi-blade fan of the present invention is higher than the full-pressure efficiency of the conventional fan, and the present invention can improve the wind guiding capability of the fan in a low air volume operating environment.

In summary, the air inlet of the multi-blade fan of the present invention does not extend beyond the inner end of the plurality of blades, so that the airflow can flow smoothly into and out of the plurality of blades in a radial direction, thereby avoiding The airflow forms turbulence and vortex between the plurality of blades, and has the effect of improving the wind guiding capability of the fan.

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.

Claims (5)

A multi-blade fan includes: a frame having an air inlet, an air outlet, and an accommodating space, the air inlet and the air outlet are connected to the accommodating space; and a fan wheel, the fan The wheel is rotatably disposed in the accommodating space, the fan wheel includes a hub and a plurality of blades, wherein the plurality of blades are disposed on a periphery of the hub, and the plurality of blades respectively have an inner end and an outer end And a windward surface of the concave curved surface, wherein the windward surface of the plurality of blades is located between the inner end and the outer end, the windward mask has a center of curvature, and the center of curvature of each of the blades and the inner end of each of the blades And the connecting line of the outer end forms a blade arc angle, the blade arc angle is between 130 degrees and 170 degrees, and a line connecting the inner end of each blade to the center of the hub forms a first reference line The tangential line of the windward surface of the blade adjacent to the inner end extends to form a second reference line, and the first reference line forms a set angle with the second reference line, and the set angle is between 40 degrees and 80 degrees. Between degrees, the fan wheel system defines a wind Surrounding, the outer circumference of the hurricane range passes through the inner end of the plurality of blades, and the range covered by the air inlet is in a range covered by the hurricane range, the air inlet Having a maximum diameter in a radial direction, the hurricane range may form a reference circle in the radial direction, and the reference circle has a reference diameter, and the ratio of the maximum aperture to the reference diameter is greater than 0.7 and less than 0.85. The multi-blade fan of claim 1, wherein the windward surfaces of the plurality of blades have the same curvature. The multi-blade fan of claim 1, wherein the center of the hub faces the air inlet in an axial direction. The multi-blade fan of claim 3, wherein the center of the hub is centered on the air inlet. The multi-blade fan of claim 1, wherein the air inlet has a diversion The flow guiding portion protrudes from the peripheral edge of the air inlet into the accommodating space.