Fan with two-section wingtip winglet fan blades

Abstract

The utility model relates to a fan with two-section wingtip winglet fan blades, which is used for solving the problems of noise and low efficiency of the existing axial flow fan caused by wingtip streaming. Comprising a hub part; the plurality of blades are arranged in a surrounding manner and are connected to the outer periphery of the hub part; the plurality of small wings are connected with the plurality of blades in a one-to-one manner, each small wing is positioned at one end, far away from the hub part, of each blade, a first fold of each small wing is arranged along the outer edge of each blade and forms a radially outward inclined surface, and a second fold of each small wing is arranged along the outer edge of the first fold and forms a radially inward inclined surface; the fold line of the junction of each blade and the first fold is a first arc, and the two ends of the first arc are located on the front edge and the blade face of each blade respectively. Therefore, the effects of improving the fan efficiency and reducing the noise can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a structure of adjusting air power, especially a fan with two-section winglet fan blade which can improve operation efficiency and reduce noise. BACKGROUND

[0002] When the axial fan blade rotates to drive airflow, a pressure difference is generated between the upper surface and the lower surface of each blade, which causes the air near the end of the blade to flow from the high-pressure upper surface to the low-pressure lower surface, thereby reducing the pressure difference between the upper and lower surfaces at the end of the blade. This results in a weakened air thrust at the end region of the fan periphery, which not only reduces the overall flow field efficiency of the fan, but also causes instability and shaking of the blade, resulting in noise and even wear and tear of the blade, thereby reducing the service life of the fan.

[0003] The existing fan can increase the path of air flowing from the upper surface of the blade to the lower surface of the end by setting a winglet at the end of the blade, thereby hindering the airflow around the end of the blade. However, the existing winglet has limited effect in reducing the above-mentioned airflow phenomenon, especially for medium and large fans, which produce more significant airflow around the end of the blade, resulting in more serious noise problems and reduced fan thrust. In addition, medium and large fans use larger size motors and hubs, which further reduce the overall flow field efficiency of the fan.

[0004] Therefore, there is still a need to improve the existing winglet. SUMMARY

[0005] To solve the above problems, the purpose of the utility model is to provide a fan with two-section winglet fan blade, which can improve the efficiency of the fan.

[0006] The second purpose of the utility model is to provide a fan with two-section winglet fan blade, which can reduce the noise of the fan operation.

[0007] The third purpose of the utility model is to provide a fan with two-section winglet fan blade, which can reduce shaking to reduce component wear and tear.

[0008] The directionality or its approximate language in the entire utility model, such as "front", "back", "upper (top)", "lower (bottom)", "inner", "outer", "side", etc., mainly refers to the direction of the drawings, and each directionality or its approximate language is only used to assist in explaining and understanding each embodiment of the utility model, and is not used to limit the utility model.

[0009] The quantity word "one" of the elements and components recorded in the whole text of the utility model is only for the convenience of use and the general meaning of the utility model range; in the utility model, it should be interpreted as including one or at least one, and the concept of a single one also includes multiple cases, unless it obviously means other meanings.

[0010] The approximate terms such as "combination", "combination" or "assembly" described in the whole text of the utility model mainly include the state that the components can be separated without being damaged after being connected, or the state that the components cannot be separated after being connected, and the person skilled in the art can select according to the material quality of the components to be connected or the assembly requirements.

[0011] The fan with two-section wing tip winglet blades of the utility model, comprising: a hub portion, rotatably combined with a motor stator; a plurality of blades, arranged around the periphery of the hub portion, and one end of each blade is connected to the outer periphery of the hub portion; and a plurality of winglets, one-to-one connected to the plurality of blades, each winglet is located at the other end of each blade away from the hub portion, a first fold of each winglet is arranged along the outer edge of each blade and forms a radial outward inclined surface, a second fold of each winglet is arranged along the outer edge of the first fold and forms a radial inward inclined surface, and the fold line at the junction of each blade and the first fold is a first circular arc, wherein the two ends of the first circular arc are located on the leading edge and the blade surface of each blade respectively; the fold line at the junction of the first fold and the second fold is a second circular arc, the outer edge of the second fold away from the hub portion is a third circular arc, and the two ends of the second circular arc and the two ends of the third circular arc are located on the leading edge and the trailing edge of each blade respectively.

[0012] Therefore, the fan with two-section wing tip winglet blades of the utility model can block the airflow affecting the blade surface pressure difference by setting the two-section winglet at the end of each blade, and achieve the effect of guiding the airflow, so as to reduce the shaking during the operation of the fan, and has the effects of improving the efficiency of the fan, reducing the noise and reducing the wear of the blades.

[0013] Among them, the arc line extending from the first circular arc to the trailing edge of each blade and including the first circular arc is a virtual arc line, the virtual arc line extends from the leading edge to the trailing edge of each blade, the length of the first circular arc is greater than or equal to one-half of the length of the virtual arc line, and less than or equal to two-thirds of the length of the virtual arc line. In this way, the junction of the blade and the first fold has a smooth surface in some areas, and some are divided by the fold line of the first circular arc, which has the effect of guiding the airflow of the blade surface.

[0014] In this design, the distance from the first arc to one axis of the hub is a first radius, the distance from the second arc to the axis is a second radius, and the distance from the third arc to the axis is a third radius. The radial width of the first fold is the second radius minus the first radius, and the radial width of the second fold is the third radius minus the second radius. The ratio of the radial width of the second fold to the radial width of the first fold is greater than or equal to 0.6 and less than or equal to 1.5. This design limits the size of the winglet, allowing the grooves formed by the first and second folds to block airflow and uniformly guide it, thus stabilizing blade rotation and improving fan efficiency.

[0015] In this design, the vertical distance between the highest and lowest points of the first fold is a first height; the vertical distance between the highest and lowest points of the second fold is a second height, and the first height and the second height are equal. Thus, the grooves formed by the winglet can uniformly guide airflow, effectively stabilizing the flow field.

[0016] The axial thickness of the hub is a third height, the first height is greater than or equal to 0.1 times the third height and less than or equal to 0.8 times the third height; and the second height is greater than or equal to 0.1 times the third height and less than or equal to 0.8 times the third height. This limits the proportion of the groove formed by the winglet relative to the fan size, allowing for adjustment of the guided airflow and enabling the selection of the winglet size based on fan characteristics. Attached Figure Description

[0017] Figure 1 : An exploded perspective view of a preferred embodiment of the present invention;

[0018] Figure 2 Top view of a preferred embodiment of the present invention;

[0019] Figure 3 Side view of the fan blade in a preferred embodiment of this utility model;

[0020] Figure 4 :like Figure 3 The enlarged view of the local structure of region A is shown.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1: Little Wing

[0023] 11: First Act

[0024] 12: Second Act

[0025] 2: Blade

[0026] 3: Hub

[0027] F: Fan

[0028] B: Fan blade

[0029] S: Motor stator

[0030] M: Fan frame

[0031] P1: First circular arc

[0032] P1': Virtual arc

[0033] P2: Second circular arc

[0034] P3: Third circular arc

[0035] X: Axis

[0036] r1: First radius

[0037] r2: Second radius

[0038] r3: Third radius

[0039] C: Leading edge

[0040] D: Trailing edge

[0041] G: Rotation direction

[0042] h1: First height

[0043] h2: Second height

[0044] h3: Third height DETAILED DESCRIPTION

[0045] In order to make the above and other objects, features and advantages of the present application more apparent, a preferred embodiment of the present application will be described in detail below with reference to the attached drawings; additionally, the same symbols are indicated in different drawings and the description thereof will be omitted.

[0046] Please refer to Figure 1 , which is a preferred embodiment of the fan with two-section winglet fan blade of the present application. The fan F includes a fan blade B composed of a plurality of winglets 1, a plurality of blades 2 and a hub 3, a motor stator S and a fan frame M. One end of the plurality of blades 2 is connected to the outer periphery of the hub 3 and arranged in a ring shape, and the other end of each blade 2 is connected to one of the winglets 1. The hub 3 is rotatably combined with the motor stator S, and can drive the hub 3 to rotate the plurality of blades 2 and the plurality of winglets 1 in the space within the fan frame M.

[0047] Please refer to Figure 2 and Figure 3As shown, the plurality of winglets 1 are connected to the plurality of blades 2 one-to-one, each winglet 1 is located at an outer end of each blade 2, each winglet 1 comprises a first fold 11 and a second fold 12, the first fold 11 is disposed along an outer edge of each blade 2 and forms a radially outward inclined surface, the second fold 12 is disposed along an outer edge of the first fold 11 and forms a radially inward inclined surface, as shown Figure 3 As shown, each winglet 1 forms two opposite inclined surfaces by the first fold 11 and the second fold 12, forming a V-shaped or U-shaped groove on the surface of the fan blade B.

[0048] Please refer to Figure 2 As shown, the fold line at the junction of each blade 2 and the first fold 11 is a first circular arc P1, the distance from the first circular arc P1 to the axis X of the hub 3 is a first radius r1, wherein the two ends of the first circular arc P1 are located at the leading edge C and the blade surface of each blade 2 respectively, that is, the first circular arc P1 does not extend to the trailing edge D of each blade 2, in addition, the plurality of blades 2 rotate in a rotation direction G, so that the leading edge C of each blade 2 faces the airflow, guiding the airflow to flow from the leading edge C to the trailing edge D of each blade 2, in detail, if the first circular arc P1 is extended to a virtual arc P1' at the trailing edge D, the virtual arc P1' includes the first circular arc P1, so that the virtual arc P1' extends from the leading edge C to the trailing edge D of each blade 2, then the length of the first circular arc P1 is preferably greater than or equal to one-half of the length of the virtual arc P1' and less than or equal to two-thirds of the length of the virtual arc P1'. In this way, the junction of each blade 2 and the first fold 11 has a smooth surface in some areas and is divided by the fold line of the first circular arc P1 in some areas.

[0049] In addition, the fold line at the junction of the first fold 11 and the second fold 12 is a second circular arc P2, the distance from the second circular arc P2 to the axis X is a second radius r2; and the outer edge of the second fold 12 away from the axis X is a third circular arc P3, the distance from the third circular arc P3 to the axis X is a third radius r3, wherein the two ends of the second circular arc P2 and the two ends of the third circular arc P3 are located at the leading edge C and the trailing edge D of each blade 2 respectively, in this way, the radial width of the first fold 11 can be the second radius r2 minus the first radius r1, and the radial width of the second fold 12 can be the third radius r3 minus the second radius r2, the radial width ratio of the second fold 12 to the first fold 11 is preferably greater than or equal to 0.6 and less than or equal to 1.5, that is

[0050] Please refer to Figure 3 and Figure 4As shown, the vertical distance between the highest point and the lowest point of the first fold 11 is a first height h1; the vertical distance between the highest point and the lowest point of the second fold 12 is a second height h2, and the first height h1 is preferably equal to the second height h2. In addition, the axial thickness of the hub portion 3 is a third height h3, the first height h1 is preferably greater than or equal to 0.1 times the third height h3 and less than or equal to 0.8 times the third height h3; and the second height h2 is preferably greater than or equal to 0.1 times the third height h3 and less than or equal to 0.8 times the third height h3, i.e. h3*0.1≤h1=h2≤h3*0.8.

[0051] In the simulation test with a specific fan blade sample, the fan blade 2 using the two-section winglet 1 is compared with the fan blade using the existing wing tip. In the wind field simulation test, the winglet 1 can effectively block the wing end flow, so that the pressure change of the blade surface is small, and the flow field flow rate is uniform. In addition, under the same noise 49 decibel operating conditions, the fan characteristic curve test is performed. Compared with the existing wing tip, the use of the winglet 1 can improve the maximum flow by 2.8% and the maximum static pressure by 6.67%. In addition, under the same condition of 4100 revolutions per minute, the use of the winglet 1 can reduce the noise by 2.1 decibels compared with the existing wing tip.

[0052] In summary, the fan with a two-section winglet fan blade of the present application can block the airflow affecting the blade surface pressure difference and achieve the effect of guiding the airflow by setting a two-section winglet at the end of each blade, thereby reducing the shaking during fan operation and improving the fan efficiency and reducing the noise.

[0053] Although the present application has been disclosed by the above preferred embodiments, it is not intended to limit the present application, and various modifications and changes of the above embodiments made by those skilled in the art without departing from the spirit and scope of the present application still belong to the technical scope protected by the present application, therefore the protection scope of the present application should be the text meaning recorded in the claims and all changes within the equivalent scope.

Claims

1. A fan having a two-stage winglet fan blade, characterized by, The fan blade includes: a hub rotatably coupled to a motor stator; a plurality of blades arranged circumferentially around an outer periphery of the hub, each blade having one end connected to an outer periphery of the hub; and a plurality of winglets one-to-one connected to the plurality of blades, each winglet being located at another end of each blade distal to the hub, each winglet having a first fold disposed along an outer edge of each blade and forming a radially outward inclined surface, and a second fold disposed along an outer edge of the first fold and forming a radially inward inclined surface, a fold line at an intersection of each blade and the first fold being a first circular arc, wherein two ends of the first circular arc are located at a leading edge and a trailing edge of each blade, respectively, a fold line at an intersection of the first fold and the second fold being a second circular arc, an outer edge of the second fold distal to the hub being a third circular arc, and two ends of the second circular arc and two ends of the third circular arc being located at the leading edge and the trailing edge of each blade, respectively.

2. The fan having a two-stage wingletted fan blade according to claim 1, wherein, An arc line extending from the first circular arc to the trailing edge of each blade and including the first circular arc is a virtual arc line, the virtual arc line extending from the leading edge to the trailing edge of each blade, a length of the first circular arc being greater than or equal to one-half of a length of the virtual arc line and less than or equal to two-thirds of the length of the virtual arc line.

3. The fan having a two-stage wingletted fan blade of claim 1, wherein, A distance of the first circular arc to an axis of the hub is a first radius, a distance of the second circular arc to the axis is a second radius, a distance of the third circular arc to the axis is a third radius, a radial width of the first fold is the second radius minus the first radius, a radial width of the second fold is the third radius minus the second radius, and a radial width ratio of the second fold to the first fold is greater than or equal to 0.6 and less than or equal to 1.

5.

4. The fan having a two-stage wingletted fan blade of claim 1, wherein, A vertical distance between a highest point and a lowest point of the first fold is a first height, and a vertical distance between a highest point and a lowest point of the second fold is a second height, the first height being equal to the second height.

5. The fan having a two-stage wingletted fan blade of claim 4, wherein, An axial thickness of the hub is a third height, the first height being greater than or equal to 0.1 times the third height and less than or equal to 0.8 times the third height, and the second height being greater than or equal to 0.1 times the third height and less than or equal to 0.8 times the third height.

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