TWI683062B - Fan blade unit and fan impeller structure thereof - Google Patents

Abstract

A fan blade unit and a fan wheel structure thereof. The fan blade unit includes a main body having a portion and an end portion defining a thickness of the main body, the root portion is connected to a hub, and the end portion extends radially in a direction opposite to the hub, The end defines a first direction and a second direction; a plurality of convex bodies are provided at the end; and at least one groove is formed between the convex bodies, the groove is provided along the first direction ; Wherein the protrusions and the groove define a total thickness equal to or less than the thickness of the main body, the fan wheel structure uses the fan blade unit, whereby when the fan wheel rotates, the groove between the protrusions and The high-pressure area is generated on the outer frame wall of the fan to suppress the vortex of the wing tip generated by the airflow rolling from the lower wing surface to the upper wing surface.

Description

Fan blade unit and its fan wheel structure

The invention relates to the field of cooling fans, in particular to a cooling fan blade structure and a cooling fan wheel with the cooling fan blade structure.

The conventional axial fan blades have different pressure distributions on the blade surface at the blade tip, causing the airflow to roll from the high-pressure lower wing surface to the low-pressure upper wing surface, which generates a strong wing tip vortex in the wing tip section. This vortex makes the fan The flow field is unstable and increases noise and reduces characteristics.

In order to reduce the strength of the wingtip vortex, the conventional method includes increasing the leaf area of the outer edge of the wingtip 90, designing the winglet winglet 91 (as shown in Figure 1A), and adding a ring structure 92 from the wingtip to the wing root (As shown in Figure 1B), etc., mainly by increasing the structure to prevent the lower wing fluid from rolling up the upper wing, weakening the vortex strength.

However, the above method has other problems. The wingtip winglet 91 in Figure 1A changes the original geometry of the fan blade tip, so that the path of fluid flow through the blade tip is hindered or bent to weaken the characteristics of the fan. The ring-shaped structure 92 in FIG. 1B increases the structure above the tip of the blade, and simultaneously increases the load at this point, causing the structure to become unstable, the vibration at the end becomes larger, and there is a risk of deformation under high-speed and high-temperature operation.

Therefore, how to solve the above-mentioned problems and deficiencies is where the inventors of the present case and related manufacturers engaged in this industry are desperate to study the direction of improvement.

Secondly, in order to effectively solve the above-mentioned problems, the object of the present invention is to provide a plurality of convex bodies at the end of each blade unit of an axial fan to form a groove through which a high-pressure area is generated during rotation to suppress the wing Sharp vortex fan blade unit and its fan wheel structure.

Another main object of the present invention is to provide a fan blade unit and its fan wheel structure that reduce the pressure loss caused by the wing tip vortex, thereby improving the working characteristics.

Another main object of the present invention is to provide a fan blade unit and a fan wheel structure that reduce the interaction between the wing tip vortex and the outer frame wall of the fan to reduce the vibration at the end of the fan blade.

To achieve the above purpose, the present invention provides a fan blade unit including a main body having a portion and an end portion and defining a thickness of the main body, the root portion is connected to a hub, and the end portion extends radially in a direction opposite to the hub. The end defines a first direction and a second direction; a plurality of convex bodies are provided at the end; and at least one groove is formed between the convex bodies, the grooves are provided along the first direction; Wherein the convex body and the groove define a total thickness equal to or not greater than the thickness of the main body.

The invention further provides a fan wheel structure comprising a hub; and a plurality of fan blade units, each fan blade unit having a main body having a portion, an end portion, a plurality of convex bodies and at least one groove, wherein the main body defines A thickness of the main body, the root portion is connected to the outer side of the hub, the end portion extends radially in a direction opposite to the hub, the end portion defines a first direction and a second direction, the protrusions are disposed at the end portion, the A groove is formed between the protrusions, and the groove is arranged along the first direction; wherein the protrusions and the groove define a total thickness equal to or less than the thickness of the body.

With the above structure, the groove at the end of the blade generates a high-pressure area during rotation, and suppresses various adverse effects caused by the vortex of the blade tip through the high-pressure area, thereby achieving noise reduction, improving characteristics and reducing vibration at the end of the blade .

1‧‧‧Wheel

2‧‧‧Fan unit

21‧‧‧Main

211‧‧‧Root

212‧‧‧End

213‧‧‧Upper surface

214‧‧‧Lower surface

215‧‧‧Body thickness

22‧‧‧The first convex body

221‧‧‧First top

222‧‧‧First bottom

223‧‧‧ first left

224‧‧‧ first right

225‧‧‧Thickness of the first convex body

23‧‧‧Second convex body

231‧‧‧Second top surface

232‧‧‧Second bottom surface

233‧‧‧ second left

234‧‧‧ second right

235‧‧‧thickness of the second convex body

24‧‧‧The third convex body

241‧‧‧The third top

242‧‧‧The third bottom

243‧‧‧ third left

244‧‧‧ third right

245‧‧‧thickness of the third convex body

3‧‧‧groove

3a‧‧‧First groove

3b‧‧‧Second groove

4‧‧‧Fan outer frame wall

HPA‧‧‧High pressure area

W‧‧‧Width

H, H1, H2‧‧‧ Height

D1‧‧‧First direction

D2‧‧‧Second direction

Fig. 1A is the first embodiment of the conventional fan blade; Fig. 1B is the second embodiment of the conventional fan blade; Fig. 2A is a perspective schematic view of the fan wheel structure of the invention; Fig. 2B is this Stereo schematic view of the fan blade structure of the invention; Figure 2C is a schematic cross-sectional view of the end of the fan blade of the present invention; Figure 2D is a schematic diagram of the fluid flow direction of the high-pressure region generated by the rotation of the fan blade of the invention; Figure 3A is a single groove of the fan blade of the invention Schematic diagram of an alternative implementation of the structure (1); FIG. 3B is a schematic diagram of the alternative implementation of the single groove structure of the fan blade of the present invention (2); FIG. 3C is a schematic diagram of the alternative implementation of the single groove structure of the fan blade of the present invention (3); 3D is a schematic diagram of an alternative implementation of a single groove structure of a fan blade of the present invention (4); FIG. 3E is a schematic diagram of an alternative implementation of a single groove structure of a fan blade of the present invention (5); FIG. 3F is a single groove of the fan blade of the present invention Schematic diagram of an alternative implementation of the structure (6); Figure 3G is a schematic diagram of an alternative implementation of the single groove structure of the fan blade of the present invention (seven); Figure 3H is a schematic diagram of an alternative implementation of the single groove structure of the fan blade of the present invention (eight); FIG. 4A is a schematic diagram of an alternative implementation of the plural groove structure of the fan blade of the present invention (1); FIG. 4B is a schematic diagram of an alternative implementation of the plural groove structure of the fan blade of the present invention (2).

The above objects, structural and functional characteristics of the present invention will be described based on the preferred embodiments of the accompanying drawings.

Please refer to FIG. 2A and FIG. 2B and FIG. 2C. The present invention mainly includes a hub 1 and a plurality of blade units 2. The outer surface of the hub 1 is provided with the blade units 2. Each blade unit 2 has a the Lord Body 21, the body 21 has a portion 211 and an end portion 212 and an upper surface 213 and a lower surface 214 and defines a body thickness 215, the root portion 211 and the end portion 212 are located at opposite ends of the body 21, the The root 211 is connected to the outer surface of the hub 1.

The end 212 of the fan unit 2 defines a first direction D1 and a second direction D2. The first direction D1 and the second direction D2 are perpendicular to each other. The first direction D1 is the long side of the end 212. The second direction D2 is the broad side of the end portion 212, which is provided with a plurality of convex bodies, the convex bodies are further defined as a first convex body 22 and a second convex body 23, the first convex body 22 And the second convex body 23 is arranged along the first direction D1, the first convex body 22, the second convex body 23 and the end portion 212 form a groove 3.

The first convex body 22 has a first top surface 221, a first bottom surface 222, a first left surface 223, and a first right surface 224 and defines a first convex body thickness 225, and the second convex body 23 has a first Two top surfaces 231, a second bottom surface 232, a second left surface 233 and a second right surface 234 define a second convex thickness 235, the first bottom surface 222 and the second bottom surface 232 are connected to the end 212, Further, the first convex body 22, the second convex body 23 and the end portion 212 can be made by integral molding or a combination of individually separate components. The integral molding can be produced through injection molding or material removal or plastic injection slider process The first protruding body 22 and the second protruding body 23 are produced by the method, and the individual and separate can be combined by means of fitting, riveting, fastening, bonding, locking, welding or welding.

The groove 3 has a height H and a width W, the length of the width W depends on the length of the first and second convex bodies 22, 23, and the size of the height H depends on the first and second convex bodies 22, 23 The thickness, that is, the height H and width W of the groove 3 can be determined by controlling the lengths and thicknesses of the first and second convex bodies 22 and 23.

Please refer to Figures 2A, 2B, 2C, and 2D. When the hub 1 rotates, the fan unit 2 is rotated at high speed. The inside of the groove 3 is like a fluid dead zone, and the fluid is in the groove 3 of A micro vortex is generated inside, which creates a high-pressure area HPA between the groove 3 and the fan outer frame wall 4, so that the airflow below (the gas below the lower surface 214) cannot pass through the fan unit 2 and the fan outer frame wall 4 The gap between the gap and the airflow above (the gas above the upper surface 213) interact to generate a wingtip vortex, thereby avoiding the noise generated by the wingtip vortex, reducing the end vibration and improving the fan characteristics.

In particular, the height H and the width W of the aforementioned groove 3 will affect the size of the HPA in the high-pressure region. When the width W is larger, the strength of the HPA in the high-pressure region can be greater. When the height H is greater, the energy can be The HPA range of the generated high-pressure area is larger, so the optimal height H and width W can be determined according to the requirements of the working point when the fan works.

Please refer to Figures 3A, 3B, 3C, 3D, 3E, 3F, 3G, and 3H, and refer to Figures 2A to 2D, which are different states. For the same fan unit 2, these embodiments have the same technical features, and all have the structure of a double-convex single groove. Figures 3A to 3D illustrate the groove 3 by the side angle of the fan unit 2 In FIGS. 3E to 3H, the end portion 212 of the blade unit 2 is an angled plan view illustrating the groove 3.

The first right side 224 and the second left side 233 in FIG. 3A are inclined, making the groove 3 appear triangular, which helps the HPA in the high-pressure area to be generated faster, and the further groove 3 can also be round or elliptical , Parallelogram, trapezoid, regular polygon or asymmetric shape. In FIG. 3B, there is a height difference (discontinuous plane) between the first left side 223 and the upper surface 213, and there is a height difference (discontinuous plane) between the second right side 234 and the lower surface 214. These height differences generate As a result, the airflow under the fan blade unit 2 is more difficult to approach the high-pressure area HPA generated by the groove 3, which further strengthens the suppression of the wing tip vortex.

The first left side 223 and the second right side 234 in FIG. 3C are inclined, the upper surface 213 and the first left side 223 are continuous but not parallel planes, and the lower surface 214 and the second right side 234 are continuous but not parallel Flat, the shape of the first and second convex bodies 22, 23 has the effect of blocking the airflow, making the airflow below the fan unit 2 more difficult to approach the high-pressure area HPA generated by the groove 3, which further strengthens the suppression of the wingtip vortex Of generation.

The end portion 212 of FIG. 3D has a plurality of receiving portions, the first bottom surface 222 of the first convex body 22 has a combined portion, and the second bottom surface 232 of the second convex body 23 has a combined portion. The height H of the groove 3, or the first and second convex bodies 22, 23 replaced by other shapes change the shape of the groove 3 or produce the height difference mentioned in the above FIG. 3B to achieve the effect of quickly changing the shape of the groove 3.

The above various technical features can be used in any combination. For example, the combination of the features of Figures 3A and 3C allows the first and second convex bodies 22 and 23 to assume a triangular shape to achieve the effect of generating a high-pressure region and blocking the airflow more quickly. Or the features of Figure 3B and Figure 3C can be combined to achieve the effect of generating a high-pressure area and guiding airflow more quickly.

Further, in the embodiments of FIGS. 3B, 3C, and 3D, the sum of the thicknesses of the first and second convex bodies 225, 235 and the height H of the groove 3 and the thickness of the guide grooves of the first and second guide grooves 25, 26 is not greater than this Body thickness 215.

The first convex body 22 and the second convex body 23 in FIG. 3E are arranged parallel and equidistant to each other, so that the width W of each place of the groove 3 is the same and centered. This arrangement makes the high-pressure area HPA stable At the same place of the fan unit 2.

The first convex body 22 and the second convex body 23 in FIG. 3F are inclined, so that the groove 3 is gradually inclined, but the height H of each part of the groove 3 is the same. This arrangement mode cooperates with the rotation of the blade 2 to make the high pressure area The effect of HPA stabilization is on the same place of the fan frame wall 4.

The first convex body 22 and the second convex body 23 in FIG. 3G are provided with mutually widening and tapering changes, so that the groove 3 is gradually expanded and tapered, and the height of the groove 3 is different, as shown in the figure The height H1 is smaller than the height H1. Such an arrangement makes the high-pressure area HPA vary in range with the height of the groove 3.

The first convex body 22 and the second convex body 23 in FIG. 3H are mutually curved, so that the groove 3 assumes a wavy shape and the height H is the same everywhere. This arrangement makes the high-pressure area HPA follow The change of the groove 3 acts on different parts of the outer frame wall 4 of the fan, so as to suppress the generation of wingtip vortex.

In addition, although the grooves 3 in the above figure are disposed centrally with respect to the fan unit 2, it is not limited to this and can be arbitrarily disposed, for example, closer to the upper surface 213 or the lower surface 214 to produce different suppression effects.

In particular, in the above embodiment, the sum of the thickness of the first convex body 225, the thickness of the second convex body 235 and the height H of the groove 3 is equal to the thickness of the body 215, and the first left side of the first convex body 22 223 does not protrude from the upper surface 213 of the main body 21, and the second right surface 234 of the second convex body 23 does not protrude from the lower surface 214 of the main body 21 (please refer to FIG. 2C), which means that the total of the fan unit 2 in this case The thickness does not change after the convex body is provided, and the total thickness of the blade unit 2 is equal to the body thickness 215.

Please refer to FIGS. 4A and 4B, supplemented by reference to FIGS. 2A to 2D and 3A to 3H. This embodiment is substantially the same as the above embodiment, and the same points are not repeated. The difference is that the end 212 A third convex body 24 is further provided. The third convex body 24 has a third top surface 241, a third bottom surface 242, a third left surface 243 and a third right surface 244. The third convex body 24 is located on the first convex body 22 And the second convex body 23.

In this embodiment, there are a plurality of grooves, a first groove 3a is formed between the first convex body 22 and the third convex body 24, the first right face 224, the end 212 and the third left face 243 Surround the first recess A groove 3a, a second groove 3b is formed between the second convex body 23 and the third convex body 24, the third right face 244, the end portion 212 and the second left face 233 surround the second groove 3b .

The third convex body 24 and the end portion 212 can be integrally formed or combined with separate components. The integral projection can be produced by injection molding or material removal or plastic injection or slider process. The body 22, the second protruding body 23 and the third protruding body 24 can be combined by fitting, riveting, fastening, bonding, locking, welding, welding or the like independently and separately.

Please refer to FIG. 4A and FIG. 4B at the same time. The third protrusion 24 in FIG. 4A is centered so that the width of the first groove 3a and the second groove 3b are the same. The third protrusion 24 in FIG. 4B For the non-centered setting, the widths of the first groove 3a and the second groove 3b are different. By adding the third protrusion 24, the first groove 3a and the second groove 3b are generated, thereby generating two high voltage regions , Making it more difficult for the airflow below to pass through the gap between the blade unit 2 and the fan outer frame wall 4 and interact with the airflow above to generate a wingtip vortex.

Further, the above-mentioned first, second, and third convex bodies 22, 23, and 24 can be arbitrarily used with the technical features of FIGS. 3A to 3H, and thus produce the same effect, so they will not be repeated here. The first The two, three, and three convex bodies 22, 23, and 24 may be the same material or different materials. The material includes any one of a polymer material, a metal material, and a composite material.

In particular, in the above embodiment, the sum of the thickness of the first convex body 225, the thickness of the second convex body 235, the thickness of the third convex body 245 and the height H1, H2 of the groove 3 is not greater than the thickness of the body 215 And the first left surface 223 of the first convex body 22 does not protrude from the upper surface 213 of the main body 21, and the second right surface 234 of the second convex body 23 does not protrude from the lower surface 214 of the main body 21 (please refer to FIGS. 4A and 4B_ ), that is to say, the total thickness of the fan unit 2 in this case will not change due to the provision of the convex body, and the total thickness of the fan unit 2 is equal to the body thickness 215.

In addition, although only three convex bodies are mentioned above to produce two grooves, but it is not limited to this, the fourth convex body or the fifth convex body can be further added to form more grooves, and all of these added convex bodies Located between the first and second convex bodies 22, 23, when the number of grooves is more than three, these grooves can have all the same height, all different heights, or partly the same or part through the arrangement change between the protrusions Different, according to use needs to be planned to produce different high-pressure areas.

In summary, the present invention has the following advantages: 1. Suppresses the vortex generated by the airflow at the wing tip; 2. Improves the fan's operating characteristics; 3. Reduces the blade end vibration; 4. Reduces the noise; 5. The groove structure adjustment changes Easy; 6. The overall thickness of the fan blade is unchanged.

However, the above are only preferred and feasible embodiments of the present invention, and any changes made by using the above-mentioned methods, shapes, structures, and devices of the present invention should be included in the scope of the rights of this case.

1‧‧‧Wheel

2‧‧‧Fan unit

21‧‧‧Main

211‧‧‧Root

212‧‧‧End

22‧‧‧The first convex body

23‧‧‧Second convex body

3‧‧‧groove

Claims (14)

A fan unit includes: a main body having a portion and an end portion defining a thickness of the main body, the root portion is connected to a hub, the end portion extends radially in a direction opposite to the hub, and the end portion defines a first direction And a second direction; a plurality of convex bodies arranged at the end; and at least one groove formed between the convex bodies, the grooves arranged along the first direction; wherein the convex bodies and the concave body The groove defines a total thickness equal to or not greater than the thickness of the body. The fan blade unit as described in item 1 of the patent application scope, wherein the first direction and the second direction are perpendicular to each other. The fan blade unit as described in item 1 of the patent application scope, wherein the convex systems are arranged at the ends in parallel or non-parallel. The fan blade unit as described in item 1 of the patent application scope, wherein the convex bodies are respectively defined as a first convex body, a second convex body and a third convex body, and the third convex body is disposed on the first convex body Between the body and the second convex body, a first groove is formed between the first and third convex bodies, and a second groove is formed between the third and second convex bodies. The fan blade unit as described in item 4 of the patent application, wherein the heights of the first groove and the second groove are the same or different. The fan blade unit as described in item 1 or item 4 of the patent application scope, in which the convex systems are integrally formed or individually made separately and then combined, the combination can be through fitting, riveting, snapping, bonding, It is combined with the end by means of locking, welding or welding. The fan blade unit according to item 1 or item 4 of the patent application scope, wherein the convex systems are the same material or different materials, and the material includes any one of a polymer material, a metal material, and a composite material. A fan wheel structure includes: a hub; and a plurality of fan blade units, each fan blade unit has a main body, the main body has a portion, an end portion, a plurality of convex bodies and at least one groove, wherein the main body defines a main body Thickness, the root connects to the outer side of the hub, the end extends radially opposite the direction of the hub, the end defines a first direction and a second direction, the protrusions are disposed at the end, the groove Formed between the convex bodies, the grooves are arranged along the first direction, wherein the convex bodies and the groove define a total thickness equal to or less than the thickness of the body. The fan wheel structure as described in item 8 of the patent application scope, wherein the first direction and the second direction are perpendicular to each other. The fan wheel structure as described in item 8 of the patent application scope, wherein the convex systems are arranged at the ends in parallel or non-parallel. The fan wheel structure as described in item 8 of the patent application scope, wherein the convex bodies are respectively defined as a first convex body, a second convex body and a third convex body, and the third convex body is disposed on the first convex body Between the body and the second convex body, a first groove is formed between the first and third convex bodies, and a second groove is formed between the third and second convex bodies. The fan wheel structure as described in item 11 of the patent application scope, wherein the heights of the first groove and the second groove are the same or different. The fan wheel structure as described in item 8 or item 11 of the patent application scope, in which the convex systems are integrally formed or individually made separately and then combined, the combination can be through fitting, riveting, snapping, bonding, It is combined with the end by means of locking, welding or welding. The fan wheel structure as described in item 8 or item 11 of the patent application scope, wherein the convex systems are the same material or different materials, and the material includes any one of a polymer material, a metal material, and a composite material.

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