TW201947119A - Fan wheel structure - Google Patents

Abstract

A fan wheel structure includes a hub provided with a plate member and a plurality of blades. The plate member is located around the hub and has an upper side and a lower side. The blades are arranged on the upper side of the plate member and respectively have a connecting end connected to the hub as well as a free end. The blades respectively include a backward-curved section, a middle section and a forward-curved section. The backward-curved section is located adjacent to the connecting end and connected to the upper side of the plate member; the forward-curved section is located adjacent to the free end; and the middle section is connected at two opposite ends to the backward-curved section and the forward-curved section. And, an air passage is formed on the upper side of the plate member between any two adjacent backward-curved sections.

Description

Fan wheel structure

The invention relates to a fan wheel structure, in particular to a fan wheel structure capable of reducing vibration and noise during fan operation.

In the field of heat dissipation, the conventional centrifugal fan enters the wind from the axial direction, and then releases the wind from the side to dissipate heat. Conventional centrifugal fans can be divided into backward tilting and forward tilting according to the blade angle of the fan wheel and the tangent angle between the exit direction. The forward-inclined blade is inclined in the direction of rotation, and the angle between the blade angle and the tangent of the exit direction is greater than 90 degrees. The blade has a short radial direction, large air volume, fast wind speed, and large noise. The tilting direction of the backward-type blade is opposite to the rotating direction. The angle between the blade angle and the tangent of the outlet direction is less than 90 degrees. The blade has a longer radial direction and a smaller outlet speed, which can generate a large wind pressure. However, under the condition that the fan speed and the outer diameter of the blade are the same, the forward-leaving blade can output a large amount of air, which provides better heat dissipation effect, but also increases the load of the motor. At the same speed, the backward-blade blade has a smaller air volume than the forward-blade blade. The backward-blade blade needs to increase the speed to achieve the same air volume and cooling effect as the forward-blade blade. Due to the increased speed, Therefore, the noise generated by the backward-inclined blades is relatively increased. In addition, after the conventional centrifugal fan airflow enters the wind from the axial direction, part of the airflow is driven by the blades and exits from the side. The other part of the airflow will pass through the blades and hit the fan base or frame, and then bounce back to the hub. And the vicinity of the blades, this will not only cause insufficient lateral airflow, but the scattered airflow of the rebound will also have a negative impact on fan noise and vibration. Therefore, how to reduce the vibration and sloshing of the blades while increasing the fan's air volume and pressure, and how to reduce the vibration and noise generated by the airflow passing through the blades and hitting the fan base or frame, are researched in this field. The direction people should work.

It is an object of the present invention to increase the fan air volume and wind pressure, and reduce vibration and sloshing during blade operation. Another object of the present invention is to reduce the vibration and noise generated by the airflow passing through the blades and impinging on the fan base or frame. In order to achieve the above object, the present invention provides a fan wheel structure comprising: a hub having a plate body and a plurality of blades, the plate body ring is arranged on the outer periphery of the hub and has an upper side and a lower side. An annular array is arranged on the upper side of the plate. The blades have a connecting end and a free end. The connecting end is connected to the outer periphery of the hub. Each blade has a backward tilting section, a middle section and a forward tilting section. The backward tilting section is adjacent to the connecting end and connected to the upper side of the board body, the forward tilting section is adjacent to the free end, the middle section is connected to the backward tilting section and the forward tilting section, and every two backward tilting sections are connected to the board body. An air flow channel is formed on the upper side. With the design of the present invention, under the condition that the fan air volume and the wind pressure are increased, the vibration and shaking of the blades during operation can be reduced, and the vibration and noise generated by the airflow passing through the blades and hitting the fan base or frame body can be reduced. .

The above-mentioned object of the present invention and its structural and functional characteristics will be described based on the preferred embodiments of the drawings. Please refer to FIG. 1, which is a perspective view of the first embodiment of the fan wheel structure of the present invention. As shown in the figure, the fan wheel structure 10 according to the present invention includes a wheel hub 100, and the arrow F indicates the rotation of the wheel hub 100. direction. The hub 100 includes a plate body 110 and a plurality of blades 120. The plate body 110 is annularly arranged on the outer periphery of the hub 100 and has an upper side 111 and a lower side 112 that are respectively disposed on the upper and lower sides of the plate body 110. The blades 120 are arranged on the upper side 111 of the plate body 110 in a circular radiation manner. The blades 120 have a connecting end 121 and a free end 122 and are respectively disposed at two ends of each blade 120. The connecting end 121 is connected to the outer periphery of the hub 100. Each blade 120 has a backwardly inclined section 123, a middle section 124 and a forwardly inclined section 125. The backwardly inclined section 123 is adjacent to the connecting end 121 and is connected to the board. The upper side 111 of the body 110, the forward tilting section 125 is adjacent to the free end 122, and the middle section 124 connects the backward tilting section 123 and the forward tilting section 125, and every two backward tilting sections 123 and the board 110 The side surface 111 forms an air flow channel 130. In addition, each blade 120 has an upper surface 126 and a lower surface 127. In this embodiment, the upper and lower surfaces 126 and 127 extend from the connecting end 121 to the free end 122. In a specific embodiment, the hub 100 is mounted on a stator (not shown) of a fan. After the stator is energized, an electromagnetic force is generated to drive the hub 100 to run. An airflow 200 is drawn into the hub 100 from the axial direction of the hub 100. (Each airflow channel 130 is used to guide the airflow 200. The first figure shows only a part of the airflow 200.) At the position 123 of the backward section of the blades 120, the airflow can be accelerated to the position 125 of the forward section. Increasing the wind pressure, the airflow 200 finally winds out from the airflow channel 130 to the side of the hub 100. With the design of the present invention, due to the arrangement of the plate body 110, the airflow 200 does not pass through the backward inclined sections 123 of the blades 120 and hits the fan base or frame downward, and the airflow 200 does not pass from the fan base or The frame springs back and scrambles, causing the blades 120 to generate unnecessary vibration or shaking, which has a negative impact on fan noise. Compared with the conventional centrifugal fan, since the backward tilting section 123 of the blades 120 is adjacent to the connection end 121, wind pressure can be increased in the backward tilting section 123, and the forward tilting section 125 has a large radius and a large number of blades. The large air volume of the hub 100 can be provided, and the fan wheel structure of the present invention can have the advantages of both forward-tilted blades and backward-tilted blades. Please refer to FIG. 2, which is a schematic perspective view of the second embodiment of the fan wheel structure of the present invention, and is supplemented by referring to FIG. 1. As shown in the figure, part of the structure and functions of this embodiment are the same as those of the first embodiment. Therefore, the details will not be repeated here, but the difference between this embodiment and the first embodiment is that the hub 100 further has a ring body 140, which has an upper end surface 141 and a lower end surface 142. The body 100 is connected to the blades 120, and the upper end surface 141 of the ring body 100 is coplanar with the upper surface 126 of the blades 120. In this embodiment, the ring body 140 is connected to the blades 120 at the position of the middle section 124 of the blades 120. The arrangement of the ring body 140 can further help the blades 120 to maintain stability during fan operation, reduce vibration, and reduce noise generated during fan operation. Please refer to FIG. 3, which is a schematic perspective view of the third embodiment of the fan wheel structure of the present invention, and is supplemented by referring to FIG. 2. As shown in the figure, part of the structure and functions of this embodiment are the same as those of the above-mentioned second embodiment. Therefore, the details will not be repeated here, but the difference between this embodiment and the second embodiment is that the ring body 140 is connected to the blades 120 at the forward-inclined section 125 of the blades 120, and An outer diameter surface 143 of the ring body 140 is coplanar with the free ends 122 of the blades 120. The arrangement of the ring body 140 reduces the interference between the free ends 122 of the blades 120 and the inner wall surface of the fan frame, thereby reducing the noise generated during the operation of the fan. The present invention has been described in detail above, but the above is only one preferred embodiment of the present invention, and the scope of implementation of the present invention cannot be limited. That is, all equivalent changes and modifications made in accordance with the scope of the application of the present invention shall still fall within the scope of patent of the present invention.

10‧‧‧Fan wheel structure

100‧‧‧ Wheel

110‧‧‧ plate

111‧‧‧ upper side

112‧‧‧ lower side

120‧‧‧ Blade

121‧‧‧Connector

122‧‧‧Free End

123‧‧‧backward slope

124‧‧‧ middle section

125‧‧‧ forward slope

126‧‧‧upper surface

127‧‧‧ lower surface

130‧‧‧airflow channel

140‧‧‧ ring body

141‧‧‧upper face

142‧‧‧ bottom face

143‧‧‧ outer diameter surface

200‧‧‧ airflow

Fig. 1 is a perspective view of the first embodiment of the fan wheel structure of the present invention; Fig. 2 is a perspective view of the second embodiment of the fan wheel structure of the present invention; Three-dimensional schematic diagrams of the three embodiments.

Claims (5)

A fan wheel structure includes: a hub having a plate body and a plurality of blades, the plate body ring is provided on the outer periphery of the hub and has an upper side and a lower side, and the blade rings are provided on the upper side of the plate The blades have a connecting end and a free end, the connecting end is connected to the outer periphery of the hub, each blade has a backward inclined section, a middle section and a forward inclined section, the backward inclined section is adjacent to the connecting end and connected On the upper side of the plate body, the forwardly inclined section is adjacent to the free end, the middle section connects the backwardly inclined section and the forwardly inclined section, and every two backwardly inclined sections form an airflow channel with the upper side of the plate. The fan wheel structure according to item 1 of the scope of patent application, wherein each blade has an upper surface and a lower surface, and the upper and lower surfaces extend from the connecting end to the free end. The fan wheel structure according to item 2 of the scope of patent application, wherein the hub further has a ring body, the ring body has an upper end surface and a lower end surface, the ring system is connected to the blades, and the upper end surface of the ring body and The upper surfaces of the blades are coplanar. The fan wheel structure according to item 3 of the patent application scope, wherein the ring system is connected with the blades at the position of the middle section. The fan wheel structure according to item 3 of the patent application scope, wherein the ring system is connected to the blades at the forwardly inclined position, and an outer diameter surface of the ring body is coplanar with the free ends of the blades.