TWI742712B - Fan impeller structure - Google Patents

Abstract

The present invention is a fan blade structure, including a hub and a blade set. The hub has a top wall and a side wall extending from the periphery of the top wall. The blade set has a plurality of upper blades and a plurality of lower blades. The blades are staggered up and down on the side wall, and each of the upper blades is provided with a first leading edge and a first trailing edge extending downwardly from the first leading edge along the length of the upper blade and jointly defining a A first windward surface, each of the lower blades is provided with a second front edge and a second trailing edge that extend upwardly from the second front edge along the length of the lower blade and jointly define a second windward surface, wherein the The first windward surface is facing downward and the second trailing edge of the lower blade is set, and the second windward surface is facing upwards and the first trailing edge of the upper blade is set. Through the design of the present invention, the fluid can be sustained. Continuously pressurize, thereby reducing vibration and noise, and reducing the effect of motor power consumption.

Description

Fan blade structure

The present invention relates to a fan blade structure, in particular to a fan blade structure that can continuously pressurize airflow and reduce noise.

In recent years, with the development of the electronics industry, the performance of electronic devices has continued to improve, and the number of internal chipsets and computing speed have continued to increase, resulting in a corresponding increase in the heat radiated by electronic devices. Therefore, cooling fans are increasingly used inside the structure of electronic components. The more extensive. Referring to Figures 1A and 1B, the conventional centrifugal fan 1 includes an upper plate 11, a bottom plate 12, an air inlet 13, an air outlet 14 and a fan blade structure 15. The outer periphery of the bottom plate 12 is surrounded by a side plate 121 upward. , The upper plate 11 covers the bottom plate 12, the top plate 11, the bottom plate 12 and the side plates 21 jointly define an accommodating space 16 for accommodating the fan blade structure 15, and the fan blade structure 15 passes through a shaft The core (not shown in the figure) is pivotally arranged with a shaft tube 122 of the bottom plate 12, and the air inlet 13 and the air outlet 14 are respectively opened on the side of the upper plate 11 and the side plate 121. The fan blade structure 15 includes a hub 151 and a plurality of radial blades 152. The plurality of radial blades 152 are arranged on the outer peripheral side of the hub 151. Each of the radial blades 152 is provided with a free end 1521, which faces the The fixed end 1522 at the center of the hub 151 is a windward surface 1523 and a leeward surface 1524 corresponding to the windward surface 1523. The fixed end 1522 of the plurality of radial blades 152 is fixedly connected to the outer peripheral side of the hub 151, and the free end 1521 An air flow channel 157 is defined between the inner surface of the side plate 121, the windward surfaces 1523 of the plurality of radial blades 152 are in the same direction and parallel to each other, and a radial flow channel is formed between the two radial blades 152 156. Therefore, when the centrifugal fan 1 is running, the fan blade structure 15 rotates counterclockwise, and the plurality of radial blades 152 will axially guide the outer airflow 17 into the air inlet 13 of the upper plate 11, so that the airflow 17 will flow from the The fixed ends 1522 of the plurality of radial blades 152 enter the respective flow passages 156 for pressure and flow out (throw out) from the free end 1521 into the air flow channel 157 in the radial direction, and follow the inner surface of the side plate 121 from the radial direction. It flows out toward the air outlet 14. However, the conventional centrifugal fan 1 has another problem. When the conventional axial air flow 17 enters the flow channel 156 of each radial blade 152, the pressurizing distance of each radial blade 152 to the air flow 17 is only The short radial blades 152 have a chord length, so that the air flow 17 in the flow channel 156 is thrown out before it can be pressurized by the radial blades 152, and most of the air flow 17 that has not been pressurized before it is pressurized will directly flow from each diameter. After being thrown out to the free end 1521 of the blade 152 and continuously hitting the inner surface of the side plate 121, it will flow out in the air flow channel 157 and toward the air outlet 14. Due to the aforementioned reasons, it causes large noise and large vibration. It also causes problems such as the inability to increase the fan's air pressure and air volume, and also causes many problems such as power consumption and energy consumption of the centrifugal fan motor. In addition, the conventional plurality of radial blades 152 are formed on the outer peripheral side of the hub 151 in a dense arrangement, so that the actual manufacturing mold is difficult to open, and the relative cost is also increased.

One object of the present invention is to provide a fan blade structure that can continuously pressurize fluid (such as air flow) and reduce noise. Another object of the present invention is to provide a design in which a plurality of upper and lower blades are staggered on the outer peripheral side wall of the hub, so that the number of blades can be reduced, and the blade structure is also conducive to making the upper mold easier to open and reduce the cost. . Another object of the present invention is to provide a fan blade structure with a plurality of upper and lower blades staggered up and down when applied to a centrifugal fan, which can achieve the effect of increasing air pressure and air volume, thereby reducing vibration and reducing the fan. The fan blade structure with the effect of power consumption by the motor. The present invention provides a fan blade structure, including a hub and a blade set. The hub has a top wall and a side wall extending from the periphery of the top wall. The blade set has a plurality of upper blades and a plurality of lower blades. The lower blades are staggered up and down on the side wall, and each of the upper blades is provided with a first front edge and a first rear edge that extend downwardly from the first front edge along the length of the upper blade and jointly define A first windward surface, each of the lower blades is provided with a second front edge and a second rear edge that extend upwardly from the second front edge along the length of the lower blade and jointly define a second windward surface, wherein The first windward surface is arranged facing the direction corresponding to the second trailing edge of the lower blade, and the second windward surface is arranged facing the direction corresponding to the first trailing edge of the upper blade. Through the design of the fan blade structure of the present invention, This makes it possible to continuously pressurize (pressurize) fluids (such as airflow) and reduce noise, and it also effectively reduces costs, reduces vibration, and reduces power consumption (energy consumption) of the fan motor.

The above-mentioned objects and structural and functional characteristics of the present invention will be described based on the preferred embodiments of the accompanying drawings. The present invention provides a fan blade structure. Please refer to Fig. 2A for a three-dimensional schematic diagram of the fan blade structure according to the first embodiment of the present invention; Fig. 2B is a schematic side view of Fig. 2A of the present invention; A schematic diagram of the flow pattern of the air flow between the plurality of upper and lower blades in an embodiment. As shown in the figure, the fan blade structure 2 includes a hub 21 and a blade set 22. The hub 21 has a top wall 211 and a side wall 212 extending from the periphery of the top wall 211. The side wall 212 is provided with an upper half 2121. And the lower half 2122. In this embodiment, the center point between the top end of the side wall 212 adjacent to the outer periphery of the hub 21 and the bottom end is the boundary point between the upper half 2121 and the lower half 2122, that is The top half of the side wall 212 to the aforementioned center point is the upper half 2121, and the bottom half 2122 from the center point to the bottom end of the side wall 212, but it is not limited to this. The blade set 22 has a plurality of upper blades 221 and a plurality of lower blades 222. The plurality of upper and lower blades 221, 222 are alternately arranged on the side wall 212 in an upward and downward manner. In this embodiment, the plurality of upper blades 221 and the plurality of lower blades The blades 222 are alternately arranged on the upper half 2121 and the lower half 2122, and the plurality of upper and lower blades 221, 222 and the center line O of the hub 21 are arranged at an oblique angle. For example, each upper blade 221 is arranged at an oblique angle. It is arranged on the upper half 2121 at an inclination angle of 30 degrees to 70 degrees, the angle is preferably 35 degrees to 50 degrees, and each of the lower blades 222 is arranged on the lower half 2122 at an inclination angle of 110 degrees to 155 degrees, The angle is preferably 120 degrees to 140 degrees. The upper and lower blades 221, 222 and the hub 21 are integrally formed, such as plastic injection or 3D printing. Of course, in another embodiment, the plurality of upper and lower blades 221, 222 and the hub 21 can be partially integrally formed and partially non-integrally formed. For example, the plurality of upper and lower blades 221 (or lower blades 222) are injection-molded on the hub. The upper half 2121 (or lower half 2122) of the side wall 212 of 21, the plurality of lower blades 222 (or upper blades 221) are joined to the lower half of the side wall 212 of the hub 21 by means of, for example, gluing, embedding or welding. Part 2122 (or upper half 2121), or an inner end 2226 (or 2216) of the lower blades 222 (or upper blades 221) facing the hub 21 with a hollow sleeve ring so as to be sleeved in the The lower half 2122 (or upper half 2121) of the side wall 212 of the hub 21 is integrated into one body. In another embodiment, the plurality of upper and lower blades 221, 222 and the hub 21 may be non-integrally formed. For example, the plurality of upper and lower blades 221, 222 are bonded to the The upper half 2121 and the lower half 2122 of the side wall 212 of the hub 21. Each of the upper blades 221 is provided with a first front edge 2211 and a first rear edge 2212 adjacent to the top wall 211. The first rear edge 2212 extends from the first front edge 2211 along the length direction of the upper blade 221. It extends downward and defines a first windward surface 2213 and a first leeward surface 2214 corresponding to the first windward surface 2213. The first windward surface 2213 and the first leeward surface 2214 are respectively disposed on both sides of the upper blade 221 During the operation of the fan structure 2 (such as counterclockwise rotation), one side (front side) of the fan structure 2 facing the direction of rotation is the first windward surface 2213, and the other side (rear side) is the first windward surface 2213. A leeward surface 2214, and the first windward surface 2213 is located in front of the first leeward surface 2214, and in this embodiment, the first windward surface 2213 and the first leeward surface 2214 are respectively concave curved surfaces and convex curved surfaces. The overall shape of the upper blades 221 is an arch shape, and the thickness of each upper blade 221 changes from thicker to thinner along the extension direction like an arch, but it is not limited. Each lower blade 222 has a second front edge 2221 adjacent to the bottom end of the side wall 212 and a second rear edge 2222. The second rear edge 2222 extends from the second front edge 2221 upward along the length of the lower blade 222. Extending obliquely and jointly define a second windward surface 2223 and a second leeward surface 2224 corresponding to the second windward surface 2223, the second windward surface 2223 and the second leeward surface 2224 are respectively disposed on both sides of the lower blade 222, In this embodiment, the structure and shape (for example, arched) of the plurality of lower blades 222 are the same as the structure and shape (for example, arched) of the upper blade 221, which will not be repeated here. The upper and lower blades 221, The difference of 222 is that the first windward surface 2213 of each upper blade 221 faces downward and is arranged in the direction corresponding to the second trailing edge 2222 of the lower blade 222, and the second windward surface 2223 of each lower blade 222 faces upwardly. It should be set in the direction of the first trailing edge 2212 of the upper blade 221, that is, as shown in Figures 2A and 2B. Two trailing edges 2222 are arranged in the upper half 2121, and the second windward surface 2223 of the lower front and lower blades 222 is arranged in the lower half 2122 in the direction of the first trailing edge 2212 of the upper blade 221 facing forward and diagonally upward. And the first windward surface 2213 and the second windward surface 2223 of the plurality of upper and lower blades 221, 222 are not facing each other and have different orientations. The first leeward surface 2214 and the second leeward surface 2224 are also different. The same orientation. In a possible embodiment, the shape of the upper blade 221 and the shape of the lower blade 222 may be the same or different. For example, the shape of the upper blade 221 may also be arc-shaped (or arched), and the upper blade The first windward surface 2213 and the first leeward surface 2214 of the 221 are respectively concave arc surfaces and convex arc surfaces. The shape of the lower blade 222 may also be arcuate (or arc), and the second surface of the lower blade 222 The windward surface 2223 and the second leeward surface 2224 are respectively concave and convex, or the upper and lower blades 221 and 222 are the same in shape and are arc-shaped (or arched). In this embodiment, the thickness of the first front edge 2211 of each upper blade 221 is greater than the thickness of the first rear edge 2212, and the thickness of the second front edge 2221 of each lower blade 222 is greater than that of the two rear edges Thickness, and the first front edge 2211 of each upper blade 221 and the second rear edge 2222 of the lower blade 222 facing forward and downward are not on the same axis. The first rear edge 2212 of each upper blade 221 It is not on the same axis as the second front edge 2221 of the lower blade 222 corresponding to the lower rear. In Figure 2B, it can be seen that the first front edge 2211 and the first rear edge 2222 of each upper blade 221 are respectively opposite to the front and lower sides. The second rear edge 2222 of the lower blade 222 and the second front edge 2221 of the lower rear blade 222 do not overlap. In other embodiments, the first front edge 2211 of each upper blade 221 and the second rear edge 2222 of the lower blade 222 facing forward and downward may be on the same axis, and the first edge of each upper blade 221 The rear edge 2212 and the second front edge 2221 of the lower blade 222 corresponding to the rear and lower sides may be on the same axis. Therefore, after an axial fluid (air flow 4) is guided by the first leading edge 2211 of the plurality of upper blades 221 of the fan blade structure 2, the plurality of upper blades 221 will pressurize the air flow 4 and move along the respective first windward edges. After the surface 2213 is thrown downwards (outflow) at a certain speed in the direction of the first trailing edge 2212, the second leading edge 2221 of the lower blade 222 below the rear will catch the upper blade 221 in front of it and throw out the pressurized The air flow 4, and then the lower blades 222 below the rear face will pressurize the air flow 4 again and will be thrown upwards (outflow) at a certain speed along the respective second windward face 2223 toward the second rear edge 2222, and then from the upper rear The first leading edge 2211 of the upper blade 221 of the lower blade 222 then throws out the pressurized air flow 4 and pressurizes the air flow 4 again, so that the air flow 4 is continuously above the plurality of upper and lower blades 221, 222 , Down, Up and Down methods continue to continuously pressurize (as shown in Figure 2C), so that the airflow 4 (fluid) can be effectively continuously pressurized (plus Pressure) and the effect of increasing the flow rate. Therefore, through the design of the fan blade structure 2 of the present invention, not only the number of blades can be effectively reduced, but also the mold is easy to open and the fan blade structure 2 is easy to manufacture, which can effectively reduce the cost. Please refer to Figure 3 for a perspective exploded view of the centrifugal fan of the second embodiment of the present invention; Figure 4A is a perspective view of the centrifugal fan assembly of the second embodiment of the present invention; Figure 4B is the second implementation of the present invention For example, the airflow of the centrifugal fan flows between the plurality of upper and lower blades; Figure 5 is a schematic diagram of the comparison of the fan blade structure of the fan of the present invention and the actual measured curve of the fan blade structure of the conventional centrifugal fan. 2A and 2C, this embodiment mainly applies the fan structure 2 of the first embodiment to a fan 3 (such as a centrifugal fan or a blower). In this embodiment, the fan structure 2 is installed on the fan 3 (such as a centrifugal fan) to drive the airflow 4. The fan 3 includes a base 32 and an upper plate 31. The upper plate 31 has an air inlet 33 for the outside air 4 (fluid) to flow into the fan 3, and the upper plate 31 is covered on the base 32 A fan frame is formed, and the upper plate 31 and the base 32 jointly define an accommodating space 35, the accommodating space 35 accommodating the fan blade structure 2, one end of an axis 36 is fixed to the hub 21, the axis The other end of 36 is pivoted with a shaft tube 322 protruding from the base 32, and the base 32 is provided with an air outlet 34 and a side plate 321 extending upward along the outer periphery of the base 32. The air outlet 34 is attached to The side of the base 32 communicates with the accommodating space 35, and an air flow channel is defined between an outer end 2215, 2225 of the plurality of upper and lower blades 221, 222 of the accommodating space 35 and the inner surface of the side plate 321 38 is connected to the air outlet 34. In the actual implementation of the present invention, a magnetic member (not shown in the figure) is provided on the inner side of the hub 21 of the fan blade structure 2 to induce magnetism with the stator 37 sheathed on the outer peripheral side of the corresponding shaft cylinder 322. Referring to Figures 2A, 4B, and 5, when the fan blade structure 2 of the fan 3 rotates counterclockwise, the air inlet 33 of the upper plate 31 will guide the outside airflow 4 into the accommodating space 35, so that After the air flow 4 is guided and entered by the first front edge 2211 of the upper blades 221, the upper blades 221 pressurize the air flow 4 and flow out (throw out) from the first rear edge 2212, so that the lower rear edge The second front edge 2221 of the blade 222 will catch the upper blade 221 in front of it and throw out the pressurized air flow 4, so that most of the air flow 4 is continuously up, down, up and down between the upper and lower blades 221 and 222. Continuously relay and pressurize continuously (as shown in Figure 4B), and then the airflow around the outer ends 2215, 2225 of the plurality of upper and lower blades 221, 222 is pushed out of the pressurized range and is pushed out along the inner surface of the side plate 321. At the same time, a small amount of air flow 4 located in the air flow channel 38 also flows out of the air outlet 34 along the inner surface of the side plate 321. In Figure 5, it is a schematic diagram showing the comparison of measured curves between the fan blade structure 2 of the fan of the present invention and the fan blade structure 15 of the conventional centrifugal fan. The horizontal coordinate (CFM) in the figure represents the air volume and the longitudinal coordinate (mmAq). It is the wind pressure (static pressure), and the present invention is represented by a solid line, and the conventional is represented by a dotted line. Therefore, according to the experimental results, the fan 3 of the present invention is centrifugal with the conventional centrifugal fan under the premise that the same size ratio and the same fan frame are used. Under the same air volume, the present invention has a higher wind pressure, and under the same air pressure, the present invention has a larger air volume. It can be seen from this that the fan 3 of the present invention can indeed effectively improve the performance of the fan 3 and reduce noise. Therefore, through the design of the fan 3 of the present invention, the airflow 4 (fluid) is continuously pressurized within the range between the plurality of upper and lower blades 221 and 222, so as to effectively increase the air pressure and air volume of the fan 3. The air flow 4 will flow out and hit the inner surface of the side plate 321 and be in the air flow channel 38. When the fan 3 is running, the overall effect of reducing noise, reducing vibration and reducing the power consumption of the fan motor can be achieved, and it can also effectively reduce Cost and good for manufacturing the upper mold and opening the mold. In addition, the first and second windward surfaces 2213, 2223 of the plurality of upper and lower blades 221, 222 of the fan blade structure 2 of the present invention push the airflow direction to be at an oblique angle (non-perpendicular to the axial direction of the air inlet 33). Angle), so that the non-vertical flow field can be achieved and is not easy to diverge.

2: Fan blade structure 21: Wheel hub 211: top wall 212: Sidewall 2121, 2122: upper and lower half 22: Blade group 221, 222: upper and lower blades 2211, 2221: the first and second leading edges 2212, 2222: first and second trailing edges 2213, 2223: the first and second windward sides 2214, 2224: the first and second leeward sides 2215, 2225: outer end 2216, 2226: inner end 3: fan 31: upper board 32: base 321: Side Panel 322: Axle Tube 33: Air inlet 34: air outlet 35: accommodation space 36: Axis 37: Stator 38: Airflow channel 4: airflow O: Centerline

Figure 1A is a three-dimensional exploded schematic view of a conventional centrifugal fan. Figure 1B is a schematic diagram of the air flow of a conventional centrifugal fan. Fig. 2A is a three-dimensional schematic diagram of the fan blade structure according to the first embodiment of the present invention. Fig. 2B is a schematic side view of Fig. 2A of the present invention. Figure 2C is a schematic diagram of the flow pattern of the air flow between the plurality of upper and lower blades according to the first embodiment of the present invention. Figure 3 is a three-dimensional exploded schematic view of the centrifugal fan according to the second embodiment of the present invention. Fig. 4A is a perspective view of the centrifugal fan assembly according to the second embodiment of the present invention. Fig. 4B is a schematic diagram of the air flow between the upper and lower blades of the centrifugal fan according to the second embodiment of the present invention. FIG. 5 is a schematic diagram showing the comparison of the measured curves between the blade structure of the fan of the present invention and the blade structure of the conventional centrifugal fan.

2: Fan blade structure

21: Wheel hub

211: top wall

212: Sidewall

2121, 2122: upper and lower half

22: Blade group

221, 222: upper and lower blades

2211, 2221: the first and second leading edges

2212, 2222: first and second trailing edges

2213, 2223: the first and second windward sides

2214, 2224: the first and second leeward sides

2215, 2225: outer end

2216, 2226: inner end

Claims (7)

A fan blade structure, including: A hub having a top wall and a side wall extending from the periphery of the top wall; A blade set has a plurality of upper blades and a plurality of lower blades. The plurality of upper and lower blades are alternately arranged on the side wall in an upward and downward manner. Each of the upper blades is provided with a first leading edge and a first trailing edge from the The first front edge extends downward along the length of the upper blade and jointly defines a first windward surface. Each of the lower blades is provided with a second front edge and a second rear edge connected from the second front edge along the The length direction of the lower blades is inclined upward and jointly defines a second windward surface; and Wherein, the first windward surface is set facing downward in the direction of the second trailing edge of the lower blade, and the second windward surface is set facing upward in the direction of the first trailing edge of the upper blade. The fan blade structure according to claim 1, wherein the side wall is provided with an upper half and a lower half, and the plurality of upper blades and the plurality of lower blades are alternately arranged on the upper half and the lower half. The fan blade structure according to claim 1, wherein the first trailing edge extends diagonally downward from the first front edge along the length of the upper blade and jointly defines a first leeward surface corresponding to the first windward surface, The second trailing edge extends diagonally upward from the second front edge along the length of the lower blade and jointly defines a second leeward surface corresponding to the second windward surface. The first leeward surface and the second leeward surface are in a shape Different directions, the first windward surface and the second windward surface are in different directions, and the second windward surface does not face the first windward surface. The fan blade structure according to claim 1, wherein the first leading edge of any one of the upper blades and the second trailing edge of the lower blade facing the front and bottom are not on the same axis or on the same axis On the line, the first trailing edge of any one of the upper blades and the second leading edge of the lower blade corresponding to the lower rear are not on the same axis or on the same axis. The fan blade structure according to claim 1, wherein the plurality of upper and lower blades are arched or arc-shaped. The fan blade structure according to claim 1, wherein the plurality of upper and lower blades and the hub are integrally formed or not integrally formed. The fan blade structure described in claim 1 uses a centrifugal fan. The centrifugal fan includes a base and an upper plate with an air inlet. The upper plate covers the base and defines an accommodating space. The fan blade structure is accommodated, one end of a shaft center is fixed to the hub, the other end of the shaft center is pivoted with a shaft tube protruding from the base, and an air outlet is provided on the side of the base to communicate with the hub. To accommodate space.

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