CN220378510U - Fan blade, fan and blowing equipment - Google Patents

Abstract

The utility model discloses a fan blade, a fan and blowing equipment, wherein the fan blade comprises: a hub; and the blades are arranged on the peripheral side of the hub, the suction surfaces of the blades are provided with a plurality of turbulence protrusions, the turbulence protrusions extend between the front edges and the rear edges of the blades, the extending directions of the turbulence protrusions are arranged at an included angle with the air flow direction passing through the suction surfaces, and the air flow direction is parallel to the tangential direction of the circumference of the hub. According to the technical scheme, the noise generated when the fan blades operate can be effectively reduced under the condition that the blowing performance is unchanged.

Description

Fan blade, fan and blowing equipment

Technical Field

The utility model relates to the technical field of blowing equipment, in particular to a fan blade, a fan and blowing equipment.

Background

The air blowing device has wide application in daily life of people, wherein the air blowing device (such as a floor fan) using the axial flow fan blade is favored by a plurality of users due to the characteristics of large wind power, wide air blowing range and the like. However, when the blower device is opened at a larger gear, the noise is often larger, which causes a certain trouble to the user, and if the gear is adjusted to be smaller, the noise is reduced, but the blower performance is affected, so that the requirement of rapid cooling of the user cannot be met.

Disclosure of Invention

The utility model mainly aims to provide a fan blade, which aims to effectively reduce noise when the fan blade runs under the condition of ensuring that the blowing performance is unchanged.

In order to achieve the above object, the present utility model provides a fan blade, comprising:

a hub; and

the blades are arranged on the peripheral side of the hub, the suction surfaces of the blades are provided with a plurality of turbulence protrusions, the turbulence protrusions extend between the front edges and the rear edges of the blades, the extending directions of the turbulence protrusions are arranged at included angles with the air flow direction passing through the suction surfaces, and the air flow direction is parallel to the tangential direction of the circumference of the hub.

The utility model also provides a fan blade, which comprises:

a hub; and

the blades are arranged on the periphery of the hub, the blades are configured into an annular structure with a hollow cavity, and at least one suction surface of each blade is provided with a turbulence protrusion.

In one embodiment, a plurality of turbulence protrusions are provided, and the plurality of turbulence protrusions are arranged at intervals along the extending direction of the blade front edge of the blade.

In one embodiment, the turbulence protrusions are provided in plurality, the turbulence protrusions include first turbulence protrusions and second turbulence protrusions which are alternately and alternately arranged along the extending direction of the front edge of the blade, an air flow channel which is arranged along the air flow direction and is open at two ends is formed between the adjacent first turbulence protrusions and second turbulence protrusions, and the extending direction of the first turbulence protrusions and the extending direction of the second turbulence protrusions are arranged at an included angle.

In one embodiment, the adjacent first turbulence protrusion and the second turbulence protrusion are used as a group of protrusions, wherein the first turbulence protrusion is positioned on one side of the second turbulence protrusion away from the hub; and taking a straight line which is positioned in the airflow channel and parallel to the airflow direction in the bulge group as a datum line, wherein the first turbulence bulge is obliquely extended from front to back to one side far away from the datum line, and the second turbulence bulge is obliquely extended from front to back to one side far away from the datum line.

In one embodiment, a first included angle alpha is formed between the extending direction of the first turbulence protrusion and the datum line, wherein alpha is more than or equal to 5 degrees and less than or equal to 80 degrees;

and/or a second included angle beta is formed between the extending direction of the second turbulence protrusion and the datum line, wherein beta is more than or equal to 5 degrees and less than or equal to 80 degrees.

In one embodiment, a first included angle alpha is formed between the extending direction of the first turbulence protrusion and the datum line, wherein alpha is more than or equal to 10 degrees and less than or equal to 50 degrees;

and/or a second included angle beta is formed between the extending direction of the second turbulence protrusion and the datum line, wherein beta is more than or equal to 10 degrees and less than or equal to 50 degrees.

In one embodiment, the spoiler protrusion is located on a side of the suction surface near a leading edge of the blade.

In one embodiment, the height of the turbulence protrusions is kept uniform; alternatively, the height of the spoiler protrusion increases from a side near the blade leading edge toward a side of the blade trailing edge.

In one embodiment, the spoiler protrusion has a lateral surface facing the hub, the lateral surface being triangular or trapezoidal or rectangular in shape.

In one embodiment, the turbulence protrusion has a bottom surface connected to the suction surface, a rear side surface extending from one end of the bottom surface near the trailing edge of the blade toward a direction away from the suction surface, and a top surface connecting the bottom surface and the rear side surface, wherein the top surface is at least partially provided in a cambered surface.

In one embodiment, the length of the turbulence protrusion is i, and the height of the turbulence protrusion is h, wherein h is equal to or less than i and equal to or less than 10h.

In one embodiment, 2 h.ltoreq.i.ltoreq.5h.

In one embodiment, the blade includes a front blade body and a rear blade body arranged along a rotation direction of the blade, wherein an end of the front blade body away from the hub and an end of the rear blade body away from the hub are close to each other to form an annular structure with a hollow cavity, and the suction surface of the front blade body and/or the suction surface of the rear blade body is provided with the turbulence protrusions.

In one embodiment, the blade further comprises a connecting piece connecting an end of the front piece away from the hub with an end of the rear piece away from the hub, the pressure surface of the front piece being connected with the suction surface of the rear piece via the outer side surface of the connecting piece; the annular structure forms a deflector for directing an air flow of the pressure face of the front sheet to the suction face of the rear sheet.

The utility model also provides a fan, which comprises a fan blade and a driving piece in driving connection with the fan blade, wherein the driving piece is used for driving the fan blade to rotate, and the fan blade is the fan blade.

The utility model also provides a blowing device which comprises the fan blade or the blower.

According to the technical scheme, the turbulence protrusions are arranged on the suction surface of the blade, when the fan blade rotates, the high-energy fluid outside the boundary layer of the surface of the blade and the low-energy fluid inside the boundary layer are mixed with each other under the influence of the turbulence protrusions by the air flow passing through the suction surface of the blade, so that the fluid kinetic energy inside the boundary layer is improved, the separation of the boundary layer fluid is delayed, the resistance of the fan blade is reduced, and the blowing performance of the fan blade is improved; and the turbulent flow bulge extends between the front edge and the rear edge of the blade, and a certain inclined angle exists between the extending direction of the turbulent flow bulge and the air flow direction, so that a better turbulent flow effect can be achieved, and the resistance of the fan blade is further reduced. Therefore, when the fan blade works, the rotating speed can be reduced to ensure that the noise is reduced under the condition that the blowing performance is unchanged from the previous one, or the blowing performance of the fan blade can be further improved under the condition that the noise is the same as the previous one. That is, compared with the traditional fan blade, the technical scheme of the utility model can effectively reduce the noise generated when the fan blade runs and improve the user experience under the condition of ensuring the unchanged blowing performance.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front elevation view of an embodiment of a fan blade of the present utility model (wherein the front of the fan blade is the side facing the user during operation or the side in the direction of air blowing);

FIG. 2 is a rear elevation view of the fan blade of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a rear perspective view of the fan blade of FIG. 2;

FIG. 5 is a partial enlarged view at B in FIG. 4;

FIG. 6 is a front elevational view of another embodiment of a fan blade according to the present utility model;

FIG. 7 is a rear elevation view of the fan blade of FIG. 6;

fig. 8 is a schematic view of several shapes of the lateral faces of the spoiler protrusion.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Fan blade	20c	Connecting sheet body
10	Hub	201	Hollow cavity
				20	Blade	30	Turbulent flow bulge
21	Suction surface	31	First turbulence protrusion
				22	Pressure surface	32	Second turbulence protrusion
23	Leaf leading edge	301	Air flow channel
				24	Leaf trailing edge	311	Lateral surface
20a	Front sheet	312	Top surface
				20b	Rear sheet

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is involved in the embodiment of the present utility model, the directional indication is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The present utility model provides a fan blade 100.

Referring to fig. 1 and 2, in an embodiment of the present utility model, the fan blade 100 includes a hub 10 and a plurality of blades 20, the plurality of blades 20 are disposed on a circumferential side of the hub 10, a suction surface 21 of each blade 20 is provided with a plurality of turbulence protrusions 30, the turbulence protrusions 30 extend between a blade front edge 23 and a blade rear edge 24 of each blade 20, an extending direction of the turbulence protrusions 30 is disposed at an included angle with an air flow direction passing through the suction surface 21, and the air flow direction is parallel to a tangential direction of a circumference of the hub 10.

Specifically, the fan blade 100 includes a hub 10 and a plurality of blades 20 disposed on a peripheral side of the hub 10, wherein the number of the blades 20 may be two, three, four, five or more according to actual needs, and is not specifically limited herein. The root of the blade 20 is connected to the hub 10, wherein the blade 20 and the hub 10 may be integrally formed, or may be connected by an assembly structure. In order to simplify the manufacturing process and improve the structural strength, the hub 10 and the blades 20 may alternatively be integrally formed, for example, by an injection molding process, or by a 3D printing technique. Each blade 20 has a certain inclination angle with respect to the axial end surface of the hub 10, and when the hub 10 rotates, the blades 20 can cut air and accelerate the flow of air flow, so as to achieve a blowing effect.

Blade 20 has opposite suction surface 21 and pressure surface 22, wherein pressure surface 22 is the surface of blade 20 facing the user during normal operation of blade 100 (i.e., the surface presented in front elevation view of blade 100 in fig. 1, which may also be referred to as the air-guiding surface of blade 20), and suction surface 21 is the surface of blade 20 facing away from the user during normal operation of blade 100 (i.e., the surface presented in back elevation view of blade 100 in fig. 2, which may also be referred to as the air-guiding surface of blade 20). It should be noted that, the blade 20 may be configured in an annular or non-annular configuration as desired, for example, as shown in fig. 1 and 2, when the blade 20 is in a conventional non-annular configuration, the single blade 20 has a suction surface 21 and a pressure surface 22 opposite the suction surface 21. As shown in fig. 6 and 7, when the blades 20 have a ring-like structure, a single blade 20 may form two suction surfaces 21, each suction surface 21 having a back surface corresponding to one pressure surface 22. When the blade 20 has a plurality of suction surfaces 21, at least one of the suction surfaces 21 is provided with the turbulence protrusions 30, and the number of the turbulence protrusions 30 may be one, two, three or more according to actual needs, which is not particularly limited herein. As shown in fig. 1, the blade 20 has a blade leading edge 23 and a blade trailing edge 24 which are disposed opposite to each other in the rotation direction of the blade 100, and the blade leading edge 23 is phase-advanced in the rotation direction of the blade 100 as compared to the blade trailing edge 24. The spoiler protrusions 30 extend between the blade leading edge 23 and the blade trailing edge 24, and a certain inclination angle exists between the extending direction of the spoiler protrusions 30 and the air flow direction, which is parallel to the tangential direction of the circumference of the hub 10.

When the conventional axial flow fan blade is in operation, a part of noise is generated by separating fluid from the blades in the boundary layer of the surfaces of the blades. According to the technical scheme, the plurality of turbulence protrusions 30 are arranged on the suction surface 21 of the blade 20, when the fan blade 100 rotates, under the influence of the turbulence protrusions 30, high-energy fluid outside the boundary layer of the surface of the blade 20 and low-energy fluid inside the boundary layer are mixed with each other by the air flow passing through the suction surface 21 of the blade 20, so that the fluid kinetic energy inside the boundary layer is improved, the separation of boundary layer fluid is delayed, the resistance of the fan blade 100 is reduced, and the blowing performance of the fan blade 100 is improved; and the turbulent flow protrusion 30 extends between the vane leading edge 23 and the vane trailing edge 24, and a certain inclination angle exists between the extending direction of the turbulent flow protrusion 30 and the air flow direction, so that a better turbulent flow effect can be achieved, and the resistance of the fan blade 100 is further reduced. Thus, when the fan blade 100 works, the rotation speed can be reduced to ensure that the noise is reduced under the condition that the blowing performance is unchanged from the previous one, or the blowing performance of the fan blade 100 can be further improved under the condition that the noise is the same as the previous one. That is, compared with the conventional fan blade, the technical scheme of the utility model can effectively reduce the noise of the fan blade 100 during operation and improve the user experience under the condition of ensuring the unchanged blowing performance.

In order to further enhance the turbulence effect, as shown in fig. 2, in one embodiment, a plurality of turbulence protrusions 30 are provided, and the plurality of turbulence protrusions 30 are arranged at intervals along the extending direction of the blade leading edge 23. The number of the turbulence protrusions 30 may be determined according to the extension length of the blade front edge 23 of the blade 20 in practical applications, so that the high-energy fluid outside the edge of the blade 20 and the low-energy fluid in the boundary layer are mixed more uniformly in the extension direction of the blade front edge 23, thereby further improving the fluid kinetic energy in the boundary layer, deferring the separation of the boundary layer fluid, reducing the resistance of the fan blade 100, and improving the blowing performance of the fan blade 100.

Referring to fig. 2 to 4, in one embodiment, the plurality of turbulence protrusions 30 includes first turbulence protrusions 31 and second turbulence protrusions 32 alternately and alternately arranged along the extending direction of the blade front edge 23, and air flow channels 301 extending along the air flow direction and having two open ends are formed between the adjacent first turbulence protrusions 31 and second turbulence protrusions 32, and the extending direction of the first turbulence protrusions 31 and the extending direction of the second turbulence protrusions 32 are disposed at an included angle.

In the present embodiment, the first turbulence protrusions 31 and the second turbulence protrusions 32 are alternately and alternately arranged along the extending direction of the blade front edge 23, and the extending direction of the first turbulence protrusions 31 and the extending direction of the second turbulence protrusions 32 have a certain included angle, so that the airflow channel 301 between the first turbulence protrusions 31 and the second turbulence protrusions 32 is generally in an "eight" shape, and two openings of the airflow channel 301 face the airflow direction. When the fan blade 100 rotates, a part of air flow passing through the suction surface 21 can flow along the air flow channel 301 between the first turbulence protrusion 31 and the second turbulence protrusion 32, so that air flow resistance is reduced, turbulence can be generated under the action of the first turbulence protrusion 31 and the second turbulence protrusion 32, and the turbulence effect can be further improved due to inconsistent extending directions of the first turbulence protrusion 31 and the second turbulence protrusion 32, so that fluid kinetic energy in a boundary layer is further improved, separation of boundary layer fluid is delayed, resistance of the fan blade 100 is reduced, and blowing performance of the fan blade 100 is improved.

Referring to fig. 2 and 3, in one embodiment, the adjacent first spoiler protrusions 31 and the second spoiler protrusions 32 are used as a group of protrusions, in which the first spoiler protrusions 31 are located at a side of the second spoiler protrusions 32 away from the hub 10; with a straight line which is located in the airflow channel 301 and parallel to the airflow direction in the protrusion set as a reference line, the first turbulence protrusions 31 extend obliquely from front to back toward a side away from the reference line, and the second turbulence protrusions 32 extend obliquely from front to back toward a side away from the reference line.

In the present embodiment, in the same protrusion group, the inclination directions of the first spoiler protrusion 31 and the second spoiler protrusion 32 with respect to the reference line are opposite, so that the distance between the first spoiler protrusion 31 and the second spoiler protrusion 32 (i.e., the width of the air flow channel 301) gradually increases from the side near the blade leading edge 23 toward the side of the blade trailing edge 24. Whereas in the adjacent two sets of projections, the width of the air flow passage 301 formed between the second spoiler projection 32 in one of the sets of projections and the first spoiler projection 31 in the adjacent other set of projections gradually decreases from the side of the blade leading edge 23 toward the side of the blade trailing edge 24. Thus, any two adjacent gas flow channels 301 may have different shapes as a whole, for example, one gas flow channel 301 may taper from the leading edge 23 to the trailing edge 24, and another gas flow channel 301 may taper from the leading edge 23 to the trailing edge 24. In this way, the turbulence effect of the boundary layer of the air flow passing through the adjacent two air flow passages 301 can be further enhanced.

In order to achieve a better turbulence effect of the air flow passing through the first turbulence protrusion 31, as shown in fig. 3, in one embodiment, a first angle α is formed between the extending direction of the first turbulence protrusion 31 and the reference line, wherein α is equal to or greater than 5 ° and equal to or less than 80 °. For example, the first included angle α may be designed to be 5 °,10 °, 15 °, 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, 80 °, and so on as needed. Preferably, 10.ltoreq.α.ltoreq.50 °.

In order to achieve a better turbulence effect of the air flow passing through the second turbulence protrusion 32, as shown in fig. 3, in one embodiment, a second angle beta is formed between the extending direction of the second turbulence protrusion 32 and the reference line, wherein beta is equal to or greater than 5 deg. and equal to or less than 80 deg.. For example, the second included angle β may be designed to be 5 °,10 °, 15 °, 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, 80 °, and so on, as desired. Preferably, 10.ltoreq.β.ltoreq.50°.

It should be noted that the setting conditions about the first angle a and the second angle β may alternatively be satisfied, or may be satisfied at the same time. Preferably, α is equal to or greater than 5 and equal to or less than 80, and β is equal to or greater than 5 and equal to or less than 80. Further preferably, 10 DEG.ltoreq.α.ltoreq.50 DEG, 10 DEG.ltoreq.β.ltoreq.50°. In addition, in the same group of protrusions, the angle settings of the first included angle a and the second included angle β may be the same or different.

It will be appreciated that as the fan blade 100 rotates, the airflow flows from the leading edge 23 toward the trailing edge 24, and the energy of the fluid is greater near the leading edge 23, so as to better achieve mixing of the high energy fluid outside the boundary layer of the surface of the blade 20 with the low energy fluid inside the boundary layer, further ensuring the turbulence effect, and in one embodiment, the turbulence protrusions 30 are located on the side of the suction surface 21 near the leading edge 23.

As shown in fig. 5 and 8, the spoiler protrusion 30 protrudes from the suction surface 21 of the blade 20 toward a side away from the suction surface 21, and a vertical distance between the side of the spoiler protrusion 30 away from the suction surface 21 and the suction surface 21 is a height h of the spoiler protrusion 30. The height of the spoiler protrusion 30 may be uniform or may be varied in the extending direction of the spoiler protrusion 30. The spoiler protrusion 30 has a lateral surface 311 facing the hub 10, and the shape of the lateral surface 311 of the spoiler protrusion 30 varies depending on the height of the spoiler protrusion 30. The shape of the lateral surface 311 of the spoiler protrusion 30 includes, but is not limited to, a triangle, trapezoid, rectangle, or other shaped arrangement. In addition, when the number of the spoiler protrusions 30 is plural, the shape of the spoiler protrusions 30 may be identical or not identical.

In one embodiment, the height of the spoiler protrusions 30 is uniform. At this time, the lateral surface 311 of the spoiler protrusion 30 may be disposed in a rectangular shape (as shown in fig. 8 (c)). It should be noted that the height of the spoiler protrusion 30 is kept uniform for the single spoiler protrusion 30, that is, the heights of the individual spoiler protrusions 30 at the respective portions thereof in the extending direction thereof are kept uniform. When the spoiler protrusions 30 are provided in plurality, the heights of the spoiler protrusions 30 may or may not be identical.

In order to achieve a better turbulence effect, in another embodiment, the height of the turbulence protrusion 30 increases from the side near the blade leading edge 23 toward the side of the blade trailing edge 24. At this time, the lateral surface 311 of the spoiler protrusion 30 may be provided in a triangular or trapezoidal shape, or at least a portion of the top surface 312 of the spoiler protrusion 30 may be designed as an arc surface (as shown in the figures (a), (b), (d), (e), (f) of fig. 8) on the basis of the triangular or trapezoidal shape.

Referring to fig. 5 and 8, in one embodiment, the spoiler protrusion 30 has a bottom surface connected to the suction surface 21, a rear side surface extending from an end of the bottom surface near the blade trailing edge 24 toward a direction away from the suction surface 21, and a top surface 312 connecting the bottom surface and the rear side surface, wherein the top surface 312 is at least partially cambered. For example, as shown in graphs (d) and (e) in fig. 8, the top surface 312 of the spoiler protrusion 30 may be designed as an upwardly convex or downwardly concave cambered surface on the basis of the triangular shape of the lateral surface 311. As another example, as shown in the graph (f) in fig. 8, a portion of the top surface 312 of the spoiler protrusion 30 near the blade leading edge 23 may be provided as a cambered surface on the basis of the trapezoidal shape of the lateral surface 311. Of course, the spoiler protrusions 30 may be provided in other shapes as desired.

In order to achieve a better turbulence effect, as shown in fig. 8, in one embodiment, the length of the turbulence protrusion 30 is i, and the height of the turbulence protrusion 30 is h, where h is equal to or less than i is equal to or less than 10h. In the present embodiment, the ratio of the length i of the spoiler protrusion 30 to the height h of the spoiler protrusion 30 may be designed to any one of values 1 to 10. Preferably, 2 h.ltoreq.i.ltoreq.5 h.

On the basis of the above embodiment, referring to fig. 6 and 7, in an embodiment, the blade 20 includes a front blade body 20a and a rear blade body 20b arranged along the rotation direction of the fan blade 100, where an end of the front blade body 20a away from the hub 10 and an end of the rear blade body 20b away from the hub 10 are close to each other to form an annular structure with a hollow cavity 201, and the suction surface 21 of the front blade body 20a and/or the suction surface 21 of the rear blade body 20b are provided with the turbulence protrusions 30.

Specifically, the front blade 20a is forward in phase in the rotational direction of the fan blade 100 as compared to the rear blade 20 b. The end of the front plate 20a remote from the hub 10 and the end of the rear plate 20b remote from the hub 10 are close to each other to construct an annular structure having a hollow cavity 201. The ring structure may be a closed ring structure or a non-closed ring structure. The closed ring shape means that the circumferential surfaces of the ring bodies are continuously connected without gaps; the non-closed ring shape means that a certain portion of the circumferential surface of the ring body is broken to form a gap, but the entire ring shape is formed. For example, when the end of the front piece 20a remote from the hub 10 is connected to the end of the rear piece 20b remote from the hub 10, a closed loop structure is formed; a non-closed loop is formed when the end of the front plate 20a remote from the hub 10 and the end of the rear plate 20b remote from the hub 10 are in close proximity to each other leaving a small gap.

In this embodiment, by providing the turbulence protrusions 30 on the suction surface 21 of the front blade 20a, the high-energy fluid outside the edge of the front blade 20a can be mixed with the low-energy fluid in the boundary layer, so as to improve the fluid kinetic energy in the boundary layer, delay the separation of the boundary layer fluid, reduce the resistance of the fan blade 100, and improve the blowing performance of the fan blade 100. By providing the turbulence protrusions 30 on the suction surface 21 of the rear blade 20b, the high-energy fluid outside the edge of the rear blade 20b can be mixed with the low-energy fluid in the boundary layer, so that the fluid kinetic energy in the boundary layer is improved, the separation of the boundary layer fluid is delayed, the resistance of the fan blade 100 is reduced, and the blowing performance of the fan blade 100 is improved. Preferably, the suction surface 21 of the front sheet 20a and the suction surface 21 of the rear sheet 20b are both provided with the turbulence protrusions 30, which can achieve better performance improvement effect, and is beneficial to greatly reducing noise when the fan blade 100 operates while ensuring the blowing performance of the fan blade 100. The blade 20 has a ring structure, so that the shapes of the front blade body 20a and the rear blade body 20b are not identical, the front blade body 20a and the rear blade body 20b can be prevented from generating the same-frequency resonance, and the influence of noise increase caused by the superposition of noise frequencies of the front blade body 20a and the rear blade body 20b can be reduced, thereby further reducing the noise during the operation of the fan blade 100. For the specific shape and the arrangement position of the spoiler protrusion 30, reference should be made to the above embodiments, and details thereof are not repeated here.

As shown in fig. 6 and 7, in one embodiment, the blade 20 further includes a connecting piece 20c, the connecting piece 20c connects an end of the front piece 20a away from the hub 10 with an end of the rear piece 20b away from the hub 10, the pressure surface 22 of the front piece 20a is connected with the suction surface 21 of the rear piece 20b via an outer side surface of the connecting piece 20c, and the annular structure forms a flow guiding portion for guiding the air flow of the pressure surface 22 of the front piece 20a to the suction surface 21 of the rear piece 20 b.

In the present embodiment, the top of the front sheet 20a and the top of the rear sheet 20b are connected together by the connecting sheet 20c to form a closed ring-shaped structure, so that the overall structural strength of the blade 20 is higher and more stable. The pressure surface 22 of the front sheet 20a (i.e., the air-guiding surface of the front sheet 20 a), the outer surface of the connecting sheet 20c, and the suction surface 21 of the rear sheet 20b (i.e., the air-guiding back surface of the rear sheet 20 b) are connected in this order. When the fan blade 100 rotates, the air vortex at the tail of the pressure surface 22 of the front blade body 20a can flow to the suction surface 21 of the rear blade body 20b along the outer side surface of the connecting blade body 20c through the flow guiding part, so that the vortex shedding noise at the tail of the front blade body 20a can be effectively reduced, and the noise of the fan blade 100 in operation can be further reduced.

As shown in fig. 6 and 7, the present utility model further provides a fan blade 100, which includes a hub 10 and a plurality of blades 20. The blades 20 are disposed on the circumferential side of the hub 10, the blades 20 are configured to have an annular structure with a hollow cavity 201, the annular structure is closed or non-closed, and at least one suction surface 21 of the blades 20 is provided with a turbulence protrusion 30.

In this embodiment, the fan blade 100 includes a hub 10 and a plurality of blades 20 disposed on the peripheral side of the hub 10, wherein the number of the blades 20 may be two, three, four, five or more according to actual needs, and is not specifically limited herein. The root of the blade 20 is connected to the hub 10, wherein the blade 20 and the hub 10 may be integrally formed, or may be connected by an assembly structure. In order to simplify the manufacturing process and improve the structural strength, the hub 10 and the blades 20 may alternatively be integrally formed, for example, by an injection molding process, or by a 3D printing technique. The blades 20 are configured to have a ring structure with a hollow cavity 201, at least two suction surfaces 21 may be formed by a single blade 20, the back surface of each suction surface 21 corresponds to one pressure surface 22, at least one of the suction surfaces 21 is provided with turbulence protrusions 30, and the number of the turbulence protrusions 30 may be one, two, three or more according to actual needs, which is not limited herein. For the specific shape and the arrangement position of the spoiler protrusion 30, reference should be made to the above embodiments, and details thereof are not repeated here.

According to the technical scheme, the plurality of turbulence protrusions 30 are arranged on the suction surface 21 of the blade 20, when the fan blade 100 rotates, under the influence of the turbulence protrusions 30, high-energy fluid outside the boundary layer of the surface of the blade 20 and low-energy fluid inside the boundary layer are mixed with each other by the air flow passing through the suction surface 21 of the blade 20, so that the fluid kinetic energy inside the boundary layer is improved, the separation of boundary layer fluid is delayed, the resistance of the fan blade 100 is reduced, and the blowing performance of the fan blade 100 is improved; thus, when the fan blade 100 works, the rotation speed can be reduced to ensure that the noise is reduced under the condition that the blowing performance is unchanged from the previous one, or the blowing performance of the fan blade 100 can be further improved under the condition that the noise is the same as the previous one. That is, compared with the conventional fan blade, the technical scheme of the utility model can effectively reduce the noise of the fan blade 100 during operation and improve the user experience under the condition of ensuring the unchanged blowing performance.

The utility model also provides a fan, which comprises a fan blade 100 and a driving piece in driving connection with the fan blade 100, wherein the driving piece is used for driving the fan blade 100 to rotate. The specific structure of the fan blade 100 refers to the above embodiments, and since the fan adopts all the technical solutions of all the embodiments, the fan at least has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein. The fan may specifically be an axial flow fan with axial flow fan blades 100, and the driving element may specifically be a driving motor.

The utility model also provides a blowing device which comprises the fan blade 100 or the fan. The fan blade 100 or the fan has the specific structure referring to the above embodiments, and since the air blowing device adopts all the technical solutions of all the embodiments, at least the air blowing device has all the beneficial effects brought by the technical solutions of the embodiments, which are not described in detail herein. The air blowing device includes, but is not limited to, a floor fan, a ceiling fan, a desk fan, and the like, and the air blowing device may also be other devices (such as an air conditioning outdoor unit) with axial flow fan blades 100.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (17)

1. A fan blade, comprising:

a hub; and

the blades are arranged on the peripheral side of the hub, the suction surfaces of the blades are provided with a plurality of turbulence protrusions, the turbulence protrusions extend between the front edges and the rear edges of the blades, the extending directions of the turbulence protrusions are arranged at included angles with the air flow direction passing through the suction surfaces, and the air flow direction is parallel to the tangential direction of the circumference of the hub.

2. The fan blade according to claim 1, wherein the turbulence protrusions are provided in plurality, the turbulence protrusions include first turbulence protrusions and second turbulence protrusions alternately and alternately arranged along the extending direction of the front edge of the blade, air flow channels extending along the air flow direction and having two open ends are formed between the adjacent first turbulence protrusions and second turbulence protrusions, and the extending direction of the first turbulence protrusions and the extending direction of the second turbulence protrusions are arranged at an included angle.

3. The fan blade according to claim 2, wherein adjacent first turbulence protrusions and second turbulence protrusions are used as a group of protrusions, and the first turbulence protrusions are located on a side of the second turbulence protrusions away from the hub; and taking a straight line which is positioned in the airflow channel and parallel to the airflow direction in the bulge group as a datum line, wherein the first turbulence bulge is obliquely extended from front to back to one side far away from the datum line, and the second turbulence bulge is obliquely extended from front to back to one side far away from the datum line.

4. The fan blade according to claim 3, wherein a first included angle alpha is formed between the extending direction of the first turbulence protrusion and the datum line, wherein alpha is more than or equal to 5 degrees and less than or equal to 80 degrees;

and/or a second included angle beta is formed between the extending direction of the second turbulence protrusion and the datum line, wherein beta is more than or equal to 5 degrees and less than or equal to 80 degrees.

5. The fan blade according to claim 3, wherein a first included angle alpha is formed between the extending direction of the first turbulence protrusion and the datum line, wherein alpha is more than or equal to 10 degrees and less than or equal to 50 degrees;

and/or a second included angle beta is formed between the extending direction of the second turbulence protrusion and the datum line, wherein beta is more than or equal to 10 degrees and less than or equal to 50 degrees.

6. A fan blade, comprising:

a hub; and

the blades are arranged on the periphery of the hub, the blades are configured into an annular structure with a hollow cavity, and at least one suction surface of each blade is provided with a turbulence protrusion.

7. The fan blade according to any one of claims 1 to 6, wherein a plurality of the turbulence protrusions are provided, and the plurality of turbulence protrusions are arranged at intervals along the extending direction of the blade front edge of the blade.

8. The fan blade of any of claims 1 to 6, wherein the spoiler protrusion is located on a side of the suction surface near a leading edge of the blade.

9. The fan blade according to any one of claims 1 to 6, wherein the height of the turbulence protrusions is kept uniform; alternatively, the height of the spoiler protrusion increases from a side near the blade leading edge toward a side of the blade trailing edge.

10. The fan blade of claim 9, wherein the turbulence bumps have lateral surfaces facing the hub, the lateral surfaces being triangular or trapezoidal or rectangular in shape.

11. The fan blade of claim 9, wherein the turbulence protrusion has a bottom surface connected to the suction surface, a rear side surface extending from an end of the bottom surface near a trailing edge of the blade toward a direction away from the suction surface, and a top surface connecting the bottom surface and the rear side surface, the top surface being at least partially cambered.

12. The fan blade according to any one of claims 1 to 6, wherein the length of the turbulence protrusions is i, and the height of the turbulence protrusions is h, wherein h.ltoreq.i.ltoreq.10h.

13. The fan blade of claim 12, wherein 2 h.ltoreq.i.ltoreq.5h.

14. The blade according to any of claims 1 to 6, wherein the blade comprises a front blade body and a rear blade body arranged in a rotation direction of the blade, wherein an end of the front blade body remote from the hub and an end of the rear blade body remote from the hub are mutually close to each other to form an annular structure with a hollow cavity, and wherein the suction surface of the front blade body and/or the suction surface of the rear blade body is provided with the turbulence protrusions.

15. The blade of claim 14, further comprising a connecting piece connecting an end of the front piece remote from the hub with an end of the rear piece remote from the hub, a pressure surface of the front piece being connected to a suction surface of the rear piece via an outer side of the connecting piece; the annular structure forms a deflector for directing an air flow of the pressure face of the front sheet to the suction face of the rear sheet.

16. A fan, comprising a fan blade and a driving member in driving connection with the fan blade, wherein the driving member is used for driving the fan blade to rotate, and the fan blade is as claimed in any one of claims 1 to 15.

17. A blowing device comprising a fan blade according to any one of claims 1 to 15; or comprising a fan as claimed in claim 16.