TWI509156B - Fan impeller structure of centrifugal fan - Google Patents

Description

Centrifugal fan blade structure

A centrifugal fan blade structure, especially a double-layer centrifugal fan, which is configured to set the distance between the blades of at least one of the upper and lower layers to be unequal, thereby reducing the noise of the blade through the tongue to greatly reduce noise. Centrifugal fan blade structure.

The current electronic industry is developing rapidly, and the performance of electronic components is constantly improving. As the speed of operation increases, the heat generated by it will generate relatively large amounts of heat. If the heat cannot be immediately dissipated, the computing power of the electronic component will be If it is lowered, it will cause burnt, so it is used as a heat dissipation in a limited system space through a small centrifugal fan. The centrifugal fan mainly includes a frame body, a fan hub, and a plurality of fan blades disposed outside the fan hub. The frame body has an air inlet port respectively above and below, and an air outlet port on the side of the frame body. When the fan body is rotated, the surrounding air flows through the fan blade body, and the axial flow from the air inlet port is entered. After being steered by the radial airflow along the fan hub, it is discharged by the air outlet.

When the centrifugal fan is running, noise will be generated due to the interaction between the non-uniform wake and the tip of the tongue, and when the gap between the impeller and the tip of the tongue is narrow, the noise is affected by the wake at the tip of the tongue and near the tip of the tongue. The pressure difference causes the tongue to oscillate. When the gap reaches 20% of the impeller radius, the main noise source only has the effect of the wake and is small. In addition, the increased vane between the impeller blades can reduce the strength of the wake, so that the influence of the wake on the pressure disturbance and noise is less obvious; therefore, the prior art has the following disadvantages:

1. Limited structural design;

2. It is not possible to flexibly design the ratio of up and down air according to the characteristics.

3. Noisy.

Accordingly, in order to solve the above disadvantages of the prior art, it is a primary object of the present invention to provide a centrifugal fan blade structure having reduced noise.

To achieve the above objective, the present invention provides a centrifugal fan blade structure, comprising: a hub, a first blade body set, and a second blade body set; the hub has an extension, the extension Having a first side and a second side; the first blade body group is disposed on the first side, the first blade body group has a plurality of first blade bodies, and the first blade body has a first air inlet and a first air outlet, the first air inlets are arranged equidistantly, and the first air outlets are non-equally disposed; the second blade body is disposed in the second On the side, the second blade body group has a plurality of second blade bodies, and the second blade body has a second air inlet and a second air outlet, and the second air outlets are equidistantly disposed.

To achieve the above objective, the present invention provides a centrifugal fan blade structure, comprising: a hub, a first blade body set, and a second blade body set; the hub has an extension, the extension Having a first side and a second side; the first blade body group is disposed on the first side, the first blade body group has a plurality of first blade bodies, and the first blade body has a first air inlet and a first air outlet, the first air inlets are arranged equidistantly, and the first air outlets are non-equally disposed; the second blade body is disposed in the second Side, the second blade body assembly There is a plurality of second blade bodies, wherein the second blade body has a second air inlet and a second air outlet, and the second air inlets are arranged equidistantly, and the second air outlets are non-aligned Isometric setting.

To achieve the above objective, the present invention provides a centrifugal fan blade structure, comprising: a hub, a first blade body set, and a second blade body set; the hub has an extension, the extension Having a first side and a second side; the first blade body group is disposed on the first side, the first blade body group has a plurality of first blade bodies, and the first blade body has a first air inlet and a first air outlet, the first air outlets are equidistantly disposed; the second blade body is disposed on the second side, and the second blade body group has a plurality of second The fan blade body has a second air inlet and a second air outlet between the second blade bodies, and the second air outlets are disposed at a non-equal distance.

The first air outlet and the second air outlet of the first and second blade body groups are selected to be arranged at different intervals, because the single sound of the blade through the tongue (BPF) can be reduced, and the double layer is The blade structure design can increase the (BPF) frequency, reduce the sound pressure weighting amount to greatly reduce the noise, and flexibly design the upper and lower fan blade structures according to the boundary conditions.

The above object of the present invention, as well as its structural and functional features, will be described in accordance with the preferred embodiments of the drawings.

Please refer to Figures 1, 2, 2a, 3, and 3a, which are perspective and top views, and a bottom view and a partial enlarged view of the first embodiment of the centrifugal fan blade structure of the present invention. As shown, the centrifugal fan fan is shown. The leaf structure 1 comprises: a hub 11, a first blade body group 12, and a second blade body group 13; the hub 11 has an extension portion 111, the extension portion 111 having a first side 1111 and a second side 1112, the extension portion 111 is configured to extend from the circumferential side of the hub 11 in a direction opposite to the hub 11.

The first blade body group 12 is disposed on the first side 1111, and the first blade body group 12 has a plurality of first blade body 121. The first blade body 121 has a first air inlet 122 therebetween. And a first air outlet 123, the first air inlets 122 are arranged at equal intervals, and the first air outlets 123 are arranged at a non-equal distance.

The second blade body group 13 is disposed on the second side 1112. The second blade body group 13 has a plurality of second blade bodies 131. The second blade body 131 has a second air inlet 132 therebetween. And a second air outlet 133, the second air outlets 133 are arranged at equal intervals.

The first blade body group 12 is configured by extending from the first side 1111 of the extending portion 111 in a direction opposite to the hub 11. The first blade body 121 has a first end 1211 and a second end. 1212, the first air inlet 122 is defined by a first end 1211 of two adjacent first blade bodies 121. The first air outlet 123 is defined by two adjacent second ends 1212, and the second The second blade body 131 has a third end 1311 and a fourth end 1312. The second blade body 131 has a third end 1311 and a fourth end 1312. The second blade body 131 has a third end 1311 and a fourth end 1312. The two air inlets 132 are defined by two adjacent third ends 1311, and the second air outlets 133 are defined by two adjacent fourth ends 1312.

The first end 1211 defines a first pitch circle 124, and the first pitch circle 124 intersects the first end 1211 in a tangential direction with a first tangent 125, and the first blade body 121 defines a first The first blade body center line 1213 intersects the first end 1211 in a tangential direction with a second tangent line 126. The second tangent line 126 intersects the first tangent line 125 and defines a first One into the wind angle 12a, the same The second end 1212 defines a second pitch 127, and the second pitch 127 has a third tangent 128 in a tangential direction intersecting the second end 1212. The first blade center line 1213 and the second end 1212 are The intersecting tangential direction has a fourth tangent line 129. The third and fourth tangent lines 128, 129 together define a first air outlet angle 12b. The third end portions 1311 collectively define a third pitch circle 134, and the third pitch circle 134 intersects the third end 1311 in a tangential direction with a fifth tangent line 135, the second leaf blade body 131 defines a second blade body center line 1313, the second blade body center line 1313 and the third end 1311 The intersecting tangential direction has a sixth tangent line 136, and the fifth tangent line 135 intersects with the sixth tangent line 136 to define a second air inlet angle 13a. The fourth end 1312 defines a fourth pitch circle 137, and The fourth segment circle 137 intersects the fourth end 1312 in a tangential direction having a seventh tangent line 138. The second blade body center line 1313 intersects the fourth end 1312 in a tangential direction with an eighth tangent line 139. The eight tangent lines 138, 139 together define a second air outlet angle 13b, and the first air inlet angle 12a of the embodiment is greater than or It is equal to the aforementioned second air inlet angle 13a.

The first and second blade body axes 1213 and 1313 extend along the first and second blade bodies 121 and 131 and have the same curvature, and the first and second blade body axes 1213 and 1313 are respectively The longitudinal thickness of the first and second blade bodies 121 and 131, that is, if the first blade body center line 1213 is used as the reference, the first blade body center line 1213 is directed to the first blade body center line 1213. The width of the two sides extending is the same width, and the relationship between the second blade body center line 1313 and the second blade body 131 is also the same with the first blade body center line 1213 and the first blade body 131. The relationship is the same.

4 and 5 are a plan view and a bottom view of a second embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment described above. No further details, but this embodiment and the first implementation described above The difference between the examples is that the first air outlet angle 12b is less than or equal to the second air outlet angle 13b.

Please refer to FIGS. 6 and 7 for a top view and a bottom view of a third embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the partial structure of the embodiment is the same as that of the first embodiment described above. It is not described again, but the difference between this embodiment and the foregoing first embodiment is that the first air inlet angle 12a is less than or equal to the second air inlet angle 13a.

Please refer to FIGS. 8 and 9 for a top view and a bottom view of a fourth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the partial structure of the embodiment is the same as that of the first embodiment described above. It is not described again, but the difference between this embodiment and the foregoing first embodiment is that the first air outlet angle 12b is greater than or equal to the second air outlet angle 13b.

FIG. 10 is a side view of the fifth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment, and thus will not be further described herein. The difference between this embodiment and the foregoing first embodiment is that the height of the second end 1212 is greater than the height of the fourth end 1312.

FIG. 11 is a side view of the sixth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment, and thus will not be further described herein. The difference between this embodiment and the foregoing first embodiment is that the height of the fourth end 1312 is greater than the height of the second end 1212.

Referring to FIG. 12, it is a plan view of a seventh embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment, and therefore will not be further described herein. The difference between this embodiment and the foregoing first embodiment is that the length of the first blade body 121 is greater than the length of the second blade body 131. degree.

FIG. 13 is a plan view of the eighth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment, and therefore will not be further described herein. The difference between this embodiment and the foregoing first embodiment is that the length of the second blade body 131 is greater than the length of the first blade body 121.

FIG. 14 is a plan view showing a ninth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment, and therefore will not be further described herein. The difference between the first embodiment and the third end 1311 is that the first end 1211 and the third end 1311 are disposed on opposite sides of the extending portion 111. The first end 1211 and the third end 1311 are not disposed correspondingly to each other, and the first and second air outlets 123 and 133 do not correspond to each other.

FIG. 15 is a plan view showing a tenth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment, and therefore will not be further described herein. The difference between this embodiment and the foregoing first embodiment is that the first end 1211 does not correspond to the third end 1311 (ie, the first end 1211 and the third end 1311 are respectively disposed on the extending portion 111). The first end and the second end 1311 are not corresponding to each other, and the first and second air inlets 122 and 132 do not correspond to each other.

FIG. 16 is a plan view of the eleventh embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the partial structure of the embodiment is the same as that of the foregoing tenth embodiment, and thus will not be further described herein. However, the difference between the embodiment and the foregoing tenth embodiment is that the first end 1211 does not correspond to the third end 1311, and the first The first and second air inlets 122 and 132 do not correspond to each other.

FIG. 17 is a plan view showing a twelfth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the partial structure of the embodiment is the same as that of the first embodiment, and thus will not be further described herein. However, the difference between this embodiment and the foregoing first embodiment is that the number of the first blade bodies 121 is greater than the number of the second blade bodies 131.

FIG. 18 is a plan view of the thirteenth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the foregoing first embodiment, and thus will not be further described herein. However, the difference between this embodiment and the foregoing first embodiment is that the number of the second blade bodies 131 is greater than the number of the first blade bodies 121.

FIG. 19 is a plan view of the fourteenth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the partial structure of the embodiment is the same as that of the first embodiment, and thus will not be further described herein. The difference between the first embodiment and the first embodiment is that the first air outlets 123 are equidistantly disposed, and the second air outlets 133 are non-equally disposed. The structural technical features disclosed in the second to thirteenth embodiments are taken as other transformation implementations.

FIG. 20 is a plan view of the fifteenth embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment, and thus will not be further described herein. The difference between the embodiment and the first embodiment is that the first air outlets 123 are non-equally disposed, and the second air outlets 133 are non-equally disposed, and the first and second air inlets 122 are 132 is equidistantly disposed, and this embodiment can also be combined with the structural technical features disclosed in the foregoing second to thirteenth embodiments as other transformation implementations.

1‧‧‧ Centrifugal fan blade structure

11‧‧·wheels

111‧‧‧Extension

1111‧‧‧ first side

1112‧‧‧ second side

12‧‧‧First leaf body group

12a‧‧‧First entry angle

12b‧‧‧First exit angle

121‧‧‧First leaf body

1211‧‧‧ first end

1212‧‧‧ second end

1213‧‧‧First leaf body midline

122‧‧‧First air inlet

123‧‧‧First air outlet

124‧‧‧The first quarter

125‧‧‧first tangent

126‧‧‧second tangent

127‧‧‧The second quarter

128‧‧‧ third tangent

129‧‧‧ fourth tangent

13‧‧‧Second leaflet group

13a‧‧‧second wind angle

13b‧‧‧second exit angle

131‧‧‧Second leaf body

1311‧‧‧ third end

1312‧‧‧ fourth end

1313‧‧‧Second leaf blade midline

132‧‧‧second air inlet

133‧‧‧second air outlet

134‧‧‧3rd round

135‧‧‧ fifth tangent

136‧‧‧ sixth tangent

137‧‧‧Fourth round

138‧‧‧ seventh tangent

139‧‧‧ eighth tangent

1 is a perspective view of a first embodiment of a centrifugal fan blade structure of the present invention; 2 is a plan view of a first embodiment of a centrifugal fan blade structure of the present invention; FIG. 2a is a partial enlarged view of a first embodiment of a centrifugal fan blade structure of the present invention; FIG. 3 is a view of the present invention The bottom view of the first embodiment of the centrifugal fan blade structure; the third drawing is a partial enlarged view of the first embodiment of the centrifugal fan blade structure of the present invention; and the fourth figure is the second embodiment of the centrifugal fan blade structure of the present invention. FIG. 5 is a bottom view of a second embodiment of a centrifugal fan blade structure according to the present invention; and FIG. 6 is a plan view of a third embodiment of the centrifugal fan blade structure of the present invention; The bottom view of the third embodiment of the centrifugal fan blade structure of the present invention; FIG. 8 is a plan view of the fourth embodiment of the centrifugal fan blade structure of the present invention; and FIG. 9 is the centrifugal fan blade structure of the present invention. 4 is a side view of a fifth embodiment of a centrifugal fan blade structure of the present invention; and FIG. 11 is a side view of a sixth embodiment of a centrifugal fan blade structure of the present invention; Figure 12 is the centrifugal wind of the present invention. FIG. 13 is a side view of the eighth embodiment of the centrifugal fan blade structure of the present invention; and FIG. 14 is a plan view of the ninth embodiment of the centrifugal fan blade structure of the present invention. Figure 15 is a plan view of a tenth embodiment of a centrifugal fan blade structure of the present invention; Figure 16 is a plan view of the eleventh embodiment of the centrifugal fan blade structure of the present invention; and Figure 17 is a view of the present invention FIG. 18 is a plan view showing a thirteenth embodiment of the centrifugal fan blade structure of the present invention; FIG. 19 is a fourteenth embodiment of the centrifugal fan blade structure of the present invention. a top view of an embodiment; Figure 20 is a plan view showing a fifteenth embodiment of the centrifugal fan blade structure of the present invention.

1‧‧‧ Centrifugal fan blade structure

11‧‧·wheels

111‧‧‧Extension

1111‧‧‧ first side

1112‧‧‧ second side

12‧‧‧First leaf body group

121‧‧‧First leaf body

122‧‧‧First air inlet

123‧‧‧First air outlet

13‧‧‧Second leaflet group

131‧‧‧Second leaf body

132‧‧‧second air inlet

133‧‧‧second air outlet

Claims (31)

A centrifugal fan blade structure includes: a hub having an extension portion having a first side and a second side; a first blade body group disposed on the first side, the first The fan blade body group has a plurality of first blade body, the first blade body has a first air inlet and a first air outlet, and the first air inlets are arranged in an equidistant manner, and the first out The tuyere is non-equidistantly arranged to reduce the sound pressure weighting amount to greatly reduce noise; a second blade body group is disposed on the second side, and the second blade body group has a plurality of second blade bodies, The second blade body has a second air inlet and a second air outlet. The centrifugal fan blade structure of claim 1, wherein the first blade body group is configured by extending from a first side of the extending portion to a direction opposite to the hub, the first blade body The first air inlet is defined by a first end of two adjacent first blade bodies, and the first air outlet is jointly defined by two adjacent second ends. The second blade body group is configured by extending from a second side of the extending portion to a direction opposite to the hub, and the second blade body has a third end and a fourth end, the second air inlet It is defined by two adjacent third ends, and the second air outlet is defined by two adjacent fourth ends. The centrifugal fan blade structure of claim 2, wherein the first ends collectively define a first pitch circle, and the first pitch circle intersects the first end with a first tangent in a tangential direction The first blade body defines a first blade body center line, and the first blade body center line has a second tangent line intersecting the first end tangential direction, and the second blade line intersects the first tangential line And jointly define a first entry An angle, the second ends together define a second pitch circle, and the second pitch circle has a third tangent to the tangential direction intersecting the second end, and the first blade body center line intersects the second end tangent The direction has a fourth tangent line, the third and fourth tangent lines together define a first air outlet angle, the third end surfaces jointly define a third pitch circle, and the third pitch circle and the third end intersect the tangential direction a fifth tangential line, the second blade body defines a second blade body center line, the second blade body center line intersects the third end tangential direction has a sixth tangential line, the fifth tangential line and the first The six tangents intersect and jointly define a second air inlet angle, the fourth ends jointly define a fourth pitch circle, and the fourth pitch circle and the fourth end intersect with a tangential direction having a seventh tangent line, the second fan The tangential direction intersecting the central line of the leaf body and the fourth end has an eighth tangent line, and the seventh and eighth tangents jointly define a second air outlet angle. The centrifugal fan blade structure of claim 3, wherein the first air inlet angle is greater than or equal to the second air inlet angle. The centrifugal fan blade structure of claim 3, wherein the first air outlet angle is greater than or equal to the second air outlet angle. The centrifugal fan blade structure of claim 3, wherein the first air inlet angle is less than or equal to the second air inlet angle. The centrifugal fan blade structure of claim 3, wherein the first air outlet angle is less than or equal to the second air outlet angle. The centrifugal fan blade structure of claim 2, wherein the height of the second end is greater than the height of the fourth end. The centrifugal fan blade structure of claim 2, wherein the height of the fourth end is greater than the height of the second end. The centrifugal fan blade structure as described in claim 1, wherein the first The length of a leaf body is greater than the length of the second blade body. The centrifugal fan blade structure of claim 1, wherein the length of the second blade body is greater than the length of the first blade body. The centrifugal fan blade structure of claim 2, wherein the first end systems correspond to the third ends. The centrifugal fan blade structure of claim 3, wherein the first end systems do not correspond to the third ends, and the first and second air inlets do not correspond to each other. The centrifugal fan blade structure of claim 1, wherein the number of the first blade bodies is greater than the number of the second blade bodies. The centrifugal fan blade structure of claim 1, wherein the number of the second blade bodies is greater than the number of the first blade bodies. The centrifugal fan blade structure according to claim 1, wherein the second blade body group is disposed in an equidistant manner and not equidistant. A centrifugal fan blade structure includes: a hub having an extension portion having a first side and a second side; a first blade body group disposed on the first side, the first The fan blade body group has a plurality of first blade body, the first blade body has a first air inlet and a first air outlet, and the first air outlets are equidistantly disposed; a second blade The second group of the second blade body has a plurality of second blade bodies, and the second blade body has a second air inlet and a second air outlet, the second The air inlets are arranged equidistantly, and the second air outlets are non-equidistantly arranged, which can reduce the sound pressure weighting amount and greatly reduce the noise. The centrifugal fan blade structure according to claim 17, wherein the first The first blade body has a first end and a second end, and the first air inlet is composed of two a first end of the adjacent first blade body is jointly defined, the first air outlet is jointly defined by two adjacent second ends, and the second blade body group is opposite to the second side of the extension The second vane body has a third end and a fourth end, and the second air inlet is jointly defined by two adjacent third ends, and the second air outlet is The two adjacent fourth ends are jointly defined. The centrifugal fan blade structure of claim 18, wherein the first ends collectively define a first pitch circle, and the first pitch circle has a first tangent to the first end intersecting the tangential direction The first blade body defines a first blade body center line, and the first blade body center line has a second tangent line intersecting the first end tangential direction, and the second blade line intersects the first tangential line And jointly defining a first air inlet angle, the second ends jointly define a second pitch circle, and the second pitch circle and the second end intersect with a tangential direction having a third tangent line in the first blade body The line intersects with the second end to have a fourth tangent line in a tangential direction, the third and fourth tangent lines jointly defining a first air exit angle, and the third ends collectively define a third pitch circle, and the third pitch circle and The third end intersects the tangential direction to have a fifth tangent line, the second blade body defines a second blade body center line, and the second blade body center line intersects the third end with a sixth tangent in a tangent direction The fifth tangent intersects the sixth tangent and collectively defines a second air inlet angle, the fourth end A fourth pitch circle is defined, and the fourth pitch circle and the fourth end intersect with a tangential direction having a seventh tangent line, and the second blade body center line intersects the fourth end with an eighth tangent line intersecting the tangent direction. The seventh and eighth tangent lines together define a second air outlet angle. The centrifugal fan blade structure of claim 19, wherein the first air inlet angle is greater than or equal to the second air inlet angle. The centrifugal fan blade structure of claim 19, wherein the first air outlet angle is greater than or equal to the second air outlet angle. The centrifugal fan blade structure of claim 19, wherein the first air inlet angle is less than or equal to the second air inlet angle. The centrifugal fan blade structure of claim 19, wherein the first air outlet angle is less than or equal to the second air outlet angle. The centrifugal fan blade structure of claim 18, wherein the height of the second end is greater than the height of the fourth end. The centrifugal fan blade structure of claim 18, wherein the height of the fourth end is greater than the height of the second end. The centrifugal fan blade structure of claim 17, wherein the length of the first blade body is greater than the length of the second blade body. The centrifugal fan blade structure of claim 17, wherein the length of the second blade body is greater than the length of the first blade body. The centrifugal fan blade structure of claim 18, wherein the first end systems correspond to the third ends. The centrifugal fan blade structure of claim 19, wherein the first end systems do not correspond to the third ends, and the first and second air inlets do not correspond to each other. The centrifugal fan blade structure of claim 17, wherein the number of the first blade bodies is greater than the number of the second blade bodies. Such as the centrifugal fan blade structure described in claim 17 of the patent application, wherein The number of second blade bodies is greater than the number of the first blade bodies.