Fan blade, blower and blowing device

Abstract

The present invention discloses a fan blade, a fan, and a blowing device. The fan blade includes: a hub; at least two sets of blade groups arranged radially along the hub, each of the blade groups includes a plurality of blades arranged at intervals in the circumferential direction of the hub, and at least one set of the blades of the blade groups constructs an annular structure with a hollow cavity; and a separation ring surrounding the periphery of the hub and located between adjacent two sets of the blade groups. The technical solution of the present invention can reduce the noise during the operation of the fan blade and can also increase the blowing range in the radial direction of the fan blade.

Description

Technical Field

[0001] The present invention relates to the technical field of blowing devices, and particularly to a fan blade, a fan, and a blowing device. Background Art

[0002] Traditional axial-flow fan blades generally have a single-ring blade structure, that is, a ring of blades is arranged around the hub of the fan blade. When the fan blade rotates, relatively large shedding vortex noise is likely to be generated at the top of the blade (i.e., the end of the blade far from the hub), resulting in a relatively large noise when the fan blade operates; and the air volume of the fan blade is generally concentrated in the middle position of the fan blade, while the air volume is relatively small at the outer position of the fan blade, resulting in a relatively small blowing range in the radial direction of the fan blade, affecting the user experience. Summary of the Invention

[0003] The main object of the present invention is to propose a fan blade, aiming to reduce the noise when the fan blade operates, and at the same time increase the blowing range in the radial direction of the fan blade.

[0004] To achieve the above object, the fan blade proposed by the present invention includes:

[0005] A hub;

[0006] At least two sets of blade groups, arranged radially along the hub, each of the blade groups includes a plurality of blades arranged at intervals in the circumferential direction of the hub, and at least one set of the blade groups has blades constructing a ring structure with a hollow cavity; and

[0007] A separating ring, surrounding the periphery of the hub and located between adjacent two sets of the blade groups.

[0008] In one embodiment, at least two sets of the blade groups include a first blade group and a second blade group, the blades of the first blade group are first blades, and the blades of the second blade group are second blades; the root of the first blade is connected to the hub, the top of the first blade is connected to the inner circumferential surface of the separating ring, the root of the second blade is connected to the outer circumferential surface of the separating ring, and the second blade constructs a ring structure with a hollow cavity.

[0009] In one embodiment, the second blade includes a front blade body and a rear blade body arranged at intervals in the rotation direction of the fan blade, one end of the front blade body far from the separating ring is close to one end of the rear blade body far from the separating ring, and the hollow cavity is formed between the front blade body and the rear blade body.

[0010] In one embodiment, the center line of the front blade body is arranged as an arc convex in the rotation direction of the fan blade, and the center line of the rear blade body is arranged as an arc convex on the side opposite to the rotation direction of the fan blade.

[0011] In one embodiment, the second blade further includes a connecting sheet body disposed opposite to the outer peripheral surface of the separating ring. The connecting sheet body connects one end of the front sheet body away from the separating ring to one end of the rear sheet body away from the separating ring. The air guiding surface of the front sheet body is connected to the air guiding back surface of the rear sheet body via the outer connecting surface of the connecting sheet body.

[0012] In one embodiment, the air guiding surface of the rear sheet body is connected to the air guiding back surface of the front sheet body via the inner connecting surface of the connecting sheet body, and at least a part of the air guiding surface of the rear sheet body and the air guiding back surface of the front sheet body are arranged in a staggered manner in the axial direction of the separating ring.

[0013] In one embodiment, one end of the front sheet body away from the separating ring and one end of the rear sheet body away from the separating ring approach each other and leave a preset gap.

[0014] In one embodiment, the roots of the front sheet body and the roots of the rear sheet body are both connected to the separating ring; or,

[0015] The root of the front sheet body is connected to the separating ring, and the root of the rear sheet body is connected to the front sheet body; or,

[0016] The root of the rear sheet body is connected to the separating ring, and the root of the front sheet body is connected to the rear sheet body.

[0017] In one embodiment, the first blade is disposed opposite to the second blade; or the first blade and the second blade are at least partially staggered in the circumferential direction of the separating ring.

[0018] In one embodiment, functional accessories are provided between adjacent two of the first blades; and / or, functional accessories are provided in the hollow cavity of the second blade.

[0019] In one embodiment, at least two groups of the blade groups include a first blade group and a second blade group. The blades of the first blade group are first blades, and the blades of the second blade group are second blades. The root of the first blade is connected to the hub, a separating ring is provided between the first blade and the second blade, and the second blade is located outside the separating ring.

[0020] The root of the first blade is connected to the hub, the top of the first blade is connected to the separating ring, the root of the second blade is connected to the separating ring, and the first blade is configured to form an annular structure with a hollow cavity.

[0021] Alternatively, the separating ring is connected to the hub through a bracket. The root of the first blade is connected to the hub, and the top of the first blade is not connected to the separating ring. The root of the second blade is connected to the separating ring, and the first blade and / or the second blade are configured to form an annular structure with a hollow cavity.

[0022] In one embodiment, the fan blade further includes an outer ring disposed around the outer periphery of the second blade group. The second blade is independently configured to form an annular structure with a hollow cavity; or the second blade and the outer ring together form an annular structure with a hollow cavity.

[0023] In one embodiment, the fan blade further includes an outer ring body disposed around the outer periphery of the outermost blade group.

[0024] In one embodiment, the suction surface of at least part of the blades is provided with turbulence protrusions.

[0025] The present invention also provides a fan, including the fan blade as described above, and a driving member drivingly connected to the fan blade, where the driving member is used to drive the fan blade to rotate.

[0026] The present invention also provides a blowing device, including the fan blade or the fan as described above.

[0027] The technical solution of the present invention is provided with at least two sets of blade groups arranged radially on the hub. Each set of blade groups includes a plurality of blades arranged at intervals along the circumferential direction of the hub. In this way, when the fan blade rotates, each set of blade groups can play a blowing role, and the blowing range of the fan blade in the radial direction can be expanded. And adjacent two sets of blade groups are separated by a partition ring. In this way, when the fan blade rotates, the air flow vortices generated at the blade tops of the blade group located in the inner circle can be blocked by the partition ring, preventing the shedding vortices at the blade tops from flowing from the air guiding surface of the blade to the air guiding back surface of the blade, and suppressing the shedding vortex noise at the blade tops. And under the blocking action of the partition ring, it can be avoided that the air flow vortices at the blade tops located in the inner circle directly shed under the action of centrifugal force, further reducing the shedding vortex noise at the blade tops, thereby reducing the overall noise of the fan blade. In addition, since at least one set of blade groups constructs an annular structure with a hollow cavity, the blades of the annular structure have blade bodies located on both sides of the hollow cavity. The blade bodies located on both sides of the hollow cavity usually have different bending directions and / or bending degrees, making the shapes of the blade bodies located on both sides of the hollow cavity not exactly the same, which can avoid the generation of noise superposition due to the same-frequency resonance of the blade bodies on both sides of the hollow cavity. In this way, the noise of the fan blade can be further reduced. In addition, the annular structure with a hollow cavity can also form a flow guiding part. When the fan blade rotates, the air flow at the blade tail can be guided to the air guiding back surface of the flow guiding part through the flow guiding part, thereby avoiding the direct shedding of the air flow vortices at the blade tail and generating a large shedding vortex noise. Considering the above-mentioned multiple factors, the noise during the operation of the fan blade can be effectively reduced, and at the same time, the blowing range of the fan blade in the radial direction can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0029] Figure 1 It is a front orthographic view of the first embodiment of the fan blade of the present invention (wherein, the front of the fan blade is the side facing the user during operation or the side of the air blowing direction);

[0030] Figure 2 is Figure 1 a front perspective view of the fan blade;

[0031] Figure 3 is Figure 1 a back perspective view of the fan blade;

[0032] Figure 4 It is a front perspective view of the second embodiment of the fan blade of the present invention;

[0033] Figure 5 Front orthographic view of the third embodiment of the fan blade of the present invention;

[0034] Figure 6 Front orthographic view of the fourth embodiment of the fan blade of the present invention;

[0035] Figure 7 Front orthographic view of the fifth embodiment of the fan blade of the present invention;

[0036] Figure 8 Rear oblique view of the sixth embodiment of the fan blade of the present invention;

[0037] Figure 9 Is Figure 8 Partial enlarged view of position A in

[0038] Figure 10 Front orthographic view of the seventh embodiment of the fan blade of the present invention;

[0039] Figure 11 Front orthographic view of the eighth embodiment of the fan blade of the present invention;

[0040] Figure 12 Front orthographic view of the ninth embodiment of the fan blade of the present invention.

[0041] Explanation of the reference numerals in the drawings:

[0042]

[0043]

[0044] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, if the embodiments of the present invention involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The present invention provides a fan blade 100.

[0049] Please refer to Figures 1 to 6 , in an embodiment of the present invention, the fan blade 100 includes a hub 10, at least two sets of blade groups, and a separation ring 30. The at least two sets of blade groups are arranged radially along the hub 10. Each blade group includes a plurality of blades arranged at intervals in the circumferential direction of the hub 10. At least one set of the blade groups has blades that form a ring structure with a hollow cavity 201, and the ring structure is a closed or non-closed ring; the separation ring 30 surrounds the periphery of the hub 10 and is located between adjacent two sets of blade groups. Among them, the separation ring 30 can be fixed by connecting to the hub 10 through a bracket, or the separation ring 30 can be supported and fixed by the inner ring blades, and no specific limitation is made here.

[0050] Specifically, the specific number of the blade groups of the fan blade 100 can be two groups, three groups or more. Each blade group includes a plurality of blades arranged at intervals in the circumferential direction of the hub 10. The number of blades in each blade group can be two, three, four, five or more. In addition, it should be noted that the number of blades in different blade groups can be the same or different. Taking the example that there are two sets of blade groups, as Figure 1 shown, the inner ring blade group includes five blades (such as the first blade 21), and the outer ring blade group also includes five blades (such as the second blade 22). At this time, the number of blades in the inner and outer two sets of blade groups is the same; or, as Figure 4As shown, the blade group located in the inner ring includes seven blades (such as the first blade 21), and the blade group located in the outer ring includes five blades (such as the second blade 22). At this time, the number of blades in the inner and outer blade groups is different. Any two adjacent blade groups are separated by a separating ring 30, and the specific number of separating rings 30 can be determined according to the number of blade groups. For example, when there are two blade groups, one separating ring 30 can be set; when there are three blade groups, two separating rings 30 can be set. Optionally, the hub 10, the blades, and the separating ring 30 are integrally formed, which can simplify the manufacturing process and improve the structural strength. Of course, in some embodiments, at least two of the hub 10, the blades, and the separating ring 30 can also be assembled through an assembly structure.

[0051] Among at least two of the blade groups, at least one blade group has blades that construct a ring structure with a hollow cavity 201. Taking the example of having two blade groups, as Figure 1 shown, the blades of the inner ring blade group are non-ring-shaped, and the blades of the outer ring blade group construct a ring structure with a hollow cavity 201. Or, as Figure 10 shown, the blades of the inner ring blade group construct a ring structure with a hollow cavity 201, and the blades of the outer ring blade group are non-ring-shaped. Or, as Figure 11 shown, the blades of both the inner and outer ring blade groups construct ring structures with a hollow cavity 201. At this time, the shapes of the ring structures constructed by the blades of the inner and outer ring blade groups can be the same or different. It should be noted that the ring structure can be a closed ring structure or a non-closed ring structure. A closed ring means that the circumferential surface of the ring body is continuously connected without gaps; a non-closed ring means that a certain part of the circumferential surface of the ring body is disconnected to form a gap, but as a whole, it still presents a ring shape. Additionally, it should also be noted that when the blades located within the separating ring 30 construct a ring structure with a hollow cavity 201, it can be that the blades independently construct the ring structure, or it can be that the blades and the separating ring 30 surrounding them jointly construct the ring structure.

[0052] The technical solution of the present invention is provided with at least two sets of blade groups arranged radially on the hub 10, and each set of blade groups includes a plurality of blades arranged at intervals in the circumferential direction of the hub 10. In this way, when the fan blade 100 rotates, each set of blade groups can play a blowing role, and the blowing range of the fan blade 100 in the radial direction can be expanded. And the adjacent two sets of blade groups are separated by a separation ring 30. In this way, when the fan blade 100 rotates, the air flow vortices generated at the blade tops of the blade group located in the inner circle can be blocked by the separation ring 30, preventing the shedding vortices at the blade tops from flowing from the air guiding surface of the blade to the air guiding back surface of the blade, and suppressing the shedding vortex noise at the blade tops. And under the blocking action of the separation ring 30, it can be avoided that the air flow vortices at the blade tops located in the inner circle directly fall off under the action of centrifugal force, and the shedding vortex noise at the blade tops can be further reduced, thereby reducing the overall noise of the fan blade 100. In addition, since at least one set of blade groups constructs an annular structure with a hollow cavity 201, the blades of the annular structure have sheet bodies (such as a front sheet body 221 and a rear sheet body 222) located on both sides of the hollow cavity 201. The sheet bodies located on both sides of the hollow cavity 201 usually have different bending directions and / or bending degrees, so that the shapes of the sheet bodies located on both sides of the hollow cavity 201 are not completely the same, which can avoid the occurrence of noise superposition due to the same-frequency resonance of the sheet bodies on both sides of the hollow cavity 201. In this way, the noise of the fan blade 100 can be further reduced. In addition, the annular structure with the hollow cavity 201 can also form a flow guiding part. When the fan blade rotates, the air flow at the blade tail can be guided to the air guiding back surface of the flow guiding part through the flow guiding part, so as to avoid the direct shedding of the air flow vortices at the blade tail and generate a large shedding vortex noise. Considering the above-mentioned various factors, the noise during the operation of the fan blade 100 can be effectively reduced, and at the same time, the blowing range of the fan blade 100 in the radial direction can be increased.

[0053] As Figures 1 to 3 shown, in one embodiment, at least two sets of the blade groups include a first blade group and a second blade group. The blades of the first blade group are first blades 21, and the blades of the second blade group are second blades 22. The root of the first blade 21 is connected to the hub 10, the top of the first blade 21 is connected to the inner peripheral surface of the separation ring 30, the root of the second blade 22 is connected to the outer peripheral surface of the separation ring 30, and the second blade 22 constructs an annular structure with a hollow cavity 201.

[0054] In this embodiment, the first blade group is arranged closer to the hub 10 than the second blade group, that is, the first blade group is the inner ring blade group and the second blade group is the outer ring blade group. The first blade group includes a plurality of first blades 21 arranged at intervals along the circumferential direction of the hub 10. The roots of the first blades 21 are all connected to the outer peripheral surface of the hub 10, and the tops of the first blades 21 are all connected to the inner peripheral surface of the separation ring 30. Among them, the first blade 21 can be a conventional non-circular structure or can be set as a circular structure. Hereinafter, the case where the first blade 21 is a non-circular structure will be mainly taken as an example.

[0055] Specifically, as Figure 2 and Figure 3 shown, the first blade 21 has a certain inclination angle relative to the axial end face of the hub 10. When the hub 10 rotates, the first blade 21 can cut the air and accelerate the flow of the air current to achieve the blowing effect. The first blade 21 has opposite first air guiding surfaces 21a and first air guiding back surfaces 21b. Among them, the first air guiding surface 21a is the surface shown by the first blade 21 in the front view of the fan blade 100 (that is, the pressure surface of the first blade 21), and the first air guiding back surface 21b is the surface shown by the first blade 21 in the rear view of the fan blade 100 (that is, the suction surface of the first blade 21). When the fan blade 100 rotates, the separation ring 30 blocks the shedding vortex at the top of the first blade 21 from flowing from the first air guiding surface 21a to the first air guiding back surface 21b, thereby suppressing the shedding vortex noise at the top of the first blade 21; and under the blocking action of the separation ring 30, it is possible to prevent the air current vortex at the top of the first blade 21 from directly shedding under the action of centrifugal force, and the shedding vortex noise at the top of the first blade 21 can be further reduced, thereby being able to reduce the overall noise of the fan blade 100. The second blade group includes a plurality of second blades 22 arranged at intervals along the circumferential direction of the separation ring 30. The roots of the second blades 22 are all connected to the outer peripheral surface of the separation ring 30. Among them, the second blade 22 is constructed into a circular structure with a hollow cavity 201. When the fan blade 100 rotates, the air current vortex generated at the top of the second blade 22 (that is, the end of the second blade 22 far from the separation ring 30) can flow along the annular surface of the circular structure, thereby being able to reduce the shedding vortex noise at the top of the second blade 22. In this way, through the combined action of the above two aspects, the noise during the operation of the fan blade 100 can be greatly reduced.

[0056] Please refer to Figure 1 and Figure 5 , in some embodiments, the second blade 22 includes a front part blade body 221 and a rear part blade body 222 arranged at intervals along the rotation direction of the fan blade 100. The end of the front part blade body 221 far from the separation ring 30 is close to the end of the rear part blade body 222 far from the separation ring 30, and the hollow cavity 201 is formed between the front part blade body 221 and the rear part blade body 222.

[0057] In this embodiment, the front blade body 221 is in a front phase in the rotation direction of the fan blade 100 compared to the rear blade body 222. One end of the front blade body 221 away from the separation ring 30 approaches one end of the rear blade body 222 away from the separation ring 30 to construct an annular structure with a hollow cavity 201. For example, in the rotation direction of the fan blade 100, one end of the front blade body 221 away from the separation ring 30 bends backward, and one end of the rear blade body 222 away from the separation ring 30 bends forward. At this time, the bending directions of the front blade body 221 and the rear blade body 222 are opposite, so that one end of the front blade body 221 away from the separation ring 30 approaches one end of the rear blade body 222 away from the separation ring 30. Of course, in some embodiments, it may also be that one end of the front blade body 221 away from the separation ring 30 bends backward, and one end of the rear blade body 222 away from the separation ring 30 does not bend or has a smaller bending amount. At this time, the bending degrees of the front blade body 221 and the rear blade body 222 are different, so that one end of the front blade body 221 away from the separation ring 30 approaches one end of the rear blade body 222 away from the separation ring 30. In this way, the front blade body 221 and the rear blade body 222 are at least different in the bending direction or the bending degree, so that the shapes of the front blade body 221 and the rear blade body 222 are not exactly the same. In this way, the front blade body 221 and the rear blade body 222 can be prevented from generating synchronous resonance, and the influence of the noise frequency superposition of the front blade body 221 and the rear blade body 222 increasing the noise can be reduced, thereby further reducing the noise during the operation of the fan blade 100. And one end of the front blade body 221 away from the separation ring 30 approaches one end of the rear blade body 222 away from the separation ring 30. When the fan blade 100 rotates, the eddy current generated at one end of the front blade body 221 away from the separation ring 30 will be blocked by the end of the rear blade body 222 and will not directly fall off. A part of the eddy current will also flow onto the rear blade body 222. In this way, the tip shedding vortex noise of the front blade body 221 can be reduced, thereby further reducing the noise during the operation of the fan blade 100. It should be noted that one end of the front blade body 221 away from the separation ring 30 approaches one end of the rear blade body 222 away from the separation ring 30. The degree of approach may specifically be that there is a small gap between the two, or they may be in contact or connected. It should be noted that when one end of the front blade body 221 away from the separation ring 30 approaches one end of the rear blade body 222 away from the separation ring 30 and a certain gap is formed, the part of the separation ring 30 corresponding to this gap constitutes a part of the hollow cavity 301; that is, the front blade body 221, the rear blade body 222, and the separation ring 30 jointly construct the hollow cavity 301.

[0058] Such as Figure 1As shown, in one embodiment, the center line of the front sheet 221 (hereinafter referred to as the first center line 2211) is arranged as an arc protruding in the rotation direction of the fan blade 100, and the center line of the rear sheet 222 (hereinafter referred to as the second center line 2221) is arranged as an arc protruding toward the side opposite to the rotation direction of the fan blade 100.

[0059] In this embodiment, the center line of the front sheet 221 (i.e., the first center line 2211) is located at the middle position between the leading edge and the trailing edge of the front sheet 221, and the center line of the rear sheet 222 (i.e., the second center line 2221) is located at the middle position between the leading edge and the trailing edge of the rear sheet 222. The first center line 2211 is arranged as an arc protruding in the rotation direction of the fan blade 100. When viewed from the rotation direction of the fan blade 100, the first center line 2211 bends backward along the direction pointing to the axis of the hub 10, so that the whole front sheet 221 presents a shape bending backward in the rotation direction of the fan blade 100; the second center line 2221 is arranged as an arc protruding toward the side opposite to the rotation direction of the fan blade 100. When viewed from the rotation direction of the fan blade 100, the second center line 2221 bends forward along the direction pointing to the axis of the hub 10, so that the whole rear sheet 222 presents a shape bending forward in the rotation direction of the fan blade 100. That is to say, in the rotation direction of the fan blade 100, the front sheet 221 and the rear sheet 222 bend in the opposite direction, and the tops of the front sheet 221 and the rear sheet 222 are close to each other, thereby constructing an annular structure with a hollow cavity 201. Such a setting is more conducive to guiding the eddy current at the tail of the front sheet 221 to the rear sheet 222, thereby effectively reducing the shedding vortex noise and reducing the noise during the operation of the fan blade 100.

[0060] As Figure 1 and Figure 2 shown, in one embodiment, the second blade 22 further includes a connecting sheet body 223 oppositely arranged with respect to the outer peripheral surface of the partition ring 30. The connecting sheet body 223 connects the end of the front sheet 221 away from the partition ring 30 to the end of the rear sheet 222 away from the partition ring 30. The air guiding surface of the front sheet 221 is connected to the air guiding back surface of the rear sheet 222 through the outer side connecting surface 223a of the connecting sheet body 223.

[0061] Specifically, as Figure 2 and Figure 3As shown in the figure, the side of the front sheet 221 facing the rotation direction of the fan blade 100 is the air guiding surface of the front sheet 221 (hereinafter referred to as the front air guiding surface 221a), and the other side of the front sheet 221 is the air guiding back surface of the front sheet 221 (hereinafter referred to as the front air guiding back surface 221b); the side of the rear sheet 222 facing the rotation direction of the fan blade 100 is the air guiding surface of the rear sheet 222 (hereinafter referred to as the rear air guiding surface 222a), and the other side of the rear sheet 222 is the air guiding back surface of the rear sheet 222 (hereinafter referred to as the rear air guiding back surface 222b); the side of the connecting sheet 223 away from the hollow cavity 201 is the outer connecting surface 223a of the connecting sheet 223, and the side of the connecting sheet 223 close to the hollow cavity 201 is the inner connecting surface 223b of the connecting sheet 223.

[0062] In this embodiment, the top of the front sheet 221 and the top of the rear sheet 222 are connected together by the connecting sheet 223 to form a closed ring-shaped structure. In this way, the overall structural strength of the second blade 22 is higher and more stable. The front air guiding surface 221a, the outer connecting surface 223a, and the rear air guiding back surface 222b are connected in sequence, so that the air flow vortex at the tail of the front air guiding surface 221a can flow along the outer connecting surface 223a to the rear air guiding back surface 222b, which can effectively reduce the shedding vortex noise at the tail of the front sheet 221, thereby effectively reducing the noise generated during the operation of the fan blade 100.

[0063] As Figure 2 shown, in one embodiment, the air guiding surface of the rear sheet 222 (hereinafter referred to as the rear air guiding surface 222a) is connected to the air guiding back surface of the front sheet 221 (hereinafter referred to as the front air guiding back surface 221b) via the inner connecting surface 223b of the connecting sheet 223, and at least part of the air guiding surface of the rear sheet 222 and the air guiding back surface of the front sheet 221 are arranged in a staggered manner in the axial direction of the partition ring 30.

[0064] In this embodiment, the rear air guiding surface 222a, the inner connecting surface 223b, and the front air guiding back surface 221b are connected in sequence. In the axial direction of the partition ring 30, at least part of the rear air guiding surface 222a and the front air guiding back surface 221b are arranged in a staggered manner, that is, when viewed from the side of the fan blade 100, the front air guiding back surface 221b does not completely block the rear air guiding surface 222a. In this way, when the fan blade 100 rotates, the rear air guiding surface 222a can play a certain air supply role. In addition, the air flow vortex at the tail of the rear air guiding surface 222a can be guided along the inner connecting surface 223b to the front air guiding back surface 221b, which can effectively reduce the noise generated during the operation of the fan blade 100.

[0065] As Figure 5As shown, in one embodiment, one end of the front blade body 221 away from the separation ring 30 approaches one end of the rear blade body 222 away from the separation ring 30, leaving a preset gap 224 therebetween. In this way, the second blade 22 presents a non-closed ring structure. When the fan blade 100 rotates, due to the obstruction of the rear blade body 222, part of the air flow vortices generated at the top of the front blade body 221 can be dispersed; at the same time, part of the air flow vortices generated at the top of the front blade body 221 can also flow to the rear blade body 222, reducing the shedding vortex noise, thereby reducing the operating noise of the fan blade 100.

[0066] In order to achieve a better noise reduction effect, optionally, on the axial projection plane of the fan blade 100, a preset gap is formed between the trailing end of the front blade body 221 and the leading end of the rear blade body 222 in the circumferential direction of the fan blade 100. The preset gap is c, and the outer diameter of the fan blade 100 is D, where 0 < c < 0.2D.

[0067] It can be understood that the smaller the preset gap, the more conducive it is for the eddy current at the trailing end of the front blade body 221 to flow to the rear blade body 222, and thus the more conducive it is to reduce the noise of the fan blade 100. In this embodiment, c < 0.2D. In this way, it can be ensured that the preset gap between the trailing end of the front blade body 221 and the leading end of the rear blade body 222 is not too large, which is conducive to the eddy current at the trailing end of the front blade body 221 flowing to the rear blade body 222, thereby achieving a better noise reduction effect. To further optimize the noise reduction effect, optionally, 0 < c < 0.05D.

[0068] In one embodiment, the projection of the trailing end of the front blade body 221 on the axis of the hub 10 at least partially coincides with the projection of the leading end of the rear blade body 222 on the axis of the hub 10. In this way, there is a certain overlapping section in the axial projection of the trailing end of the front blade body 221 and the leading end of the rear blade body 222 on the hub 10 axis. When the fan blade 100 rotates, it is more conducive for the eddy current at the trailing end of the front blade body 221 to flow to the rear blade body 222, thereby further improving the noise reduction effect.

[0069] In one embodiment, the overlapping dimension of the projection of the trailing end of the front blade body 221 on the axis of the hub 10 and the projection of the leading end of the rear blade body 222 on the axis of the hub 10 is f, and the outer diameter of the fan blade 100 is D, where 0 < f < 0.2D. Optionally, 0 < f < 0.05D.

[0070] In order to further improve the noise reduction effect, in some embodiments, one end of the front sheet body 221 away from the partition ring 30 and one end of the rear sheet body 222 away from the partition ring 30 are close to each other and leave a preset gap 224, and one end of the front sheet body 221 away from the partition ring 30 and / or one end of the rear sheet body 222 away from the partition ring 30 are provided with bending parts. By arranging the bending parts, the air flow of the corresponding sheet body can be effectively blocked from flowing from the side with high pressure to the side with low pressure, thereby reducing the generation of eddy currents, and further reducing the noise generated at the corresponding sheet body, which is beneficial to further reducing the noise generated during the operation of the fan blade 100.

[0071] There are various specific connection methods between the roots of the front sheet body 221 and the roots of the rear sheet body 222 and the partition ring 30, as long as it can ensure the construction of an annular structure with a hollow cavity 201. For example, in one embodiment, as Figure 1 shown, the roots of the front sheet body 221 and the roots of the rear sheet body 222 are both connected to the partition ring 30; or, as Figure 6 shown, in another embodiment, the root of the front sheet body 221 is connected to the partition ring 30, and the root of the rear sheet body 222 is connected to the front sheet body 221; or, in other embodiments, the root of the rear sheet body 222 is connected to the partition ring 30, and the root of the front sheet body 221 is connected to the rear sheet body 222.

[0072] The number and relative position relationship of the first blade 21 and the second blade 22 can be set according to actual needs. In one embodiment, the first blade 21 and the second blade 22 are arranged opposite to each other. For example, as Figure 1 shown, the number of the first blade 21 and the second blade 22 is the same, and they are arranged in one-to-one correspondence. In another embodiment, the first blade 21 and the second blade 22 are at least partially staggered in the circumferential direction of the partition ring 30. For example, as Figure 4 shown, the number of the first blade 21 is greater than the number of the second blade 22, and the first blade 21 and the second blade 22 are at least partially staggered in the circumferential direction of the partition ring 30.

[0073] In order to enable the fan blade 100 to have other additional functions while having the blowing function, in one embodiment, a functional accessory 40 is provided between two adjacent first blades 21; and / or, a functional accessory 40 is provided in the hollow cavity 201 of the second blade 22. Among them, the functional accessory 40 includes but is not limited to a purification part, a mosquito repellent part, an aromatherapy part, a heating part, a humidifying part, etc.

[0074] For example, traditional axial-flow fan blades generally do not have an air purification function. Some blowing devices achieve the purification function by adding a purification component on the air inlet side of the fan blades. However, this will increase the wind resistance and affect the blowing effect. In order to enable the fan blade 100 to have an air purification function without affecting the blowing effect. As Figure 7 shown, in one embodiment, a purification component 40 is provided between two adjacent first blades 21; and / or, a purification component 40 is provided in the hollow cavity 201 of the second blade 22. There can be various specific types of the purification component 40, including but not limited to one or a combination of several of a filter screen (such as a primary filter screen, a high-efficiency filter screen, an activated carbon filter screen, etc.), a negative ion generator, etc.

[0075] Regarding the specific assembly method of the purification component 40 and the fan blade 100, it can be integrally formed, or a detachable assembly can be carried out using assembly structures such as snaps and screws. Optionally, the purification component 40 and the fan blade 100 are integrally injection-molded. Taking the purification component 40 as a filter screen as an example, during manufacturing, the filter screen and the fan blade 100 can be integrally injection-molded through an insert injection molding process. The molding process is simple, the structure is stable and reliable, subsequent assembly processes can be omitted, production efficiency can be improved, and production costs can be reduced.

[0076] The specific structure of the fan blade 100 is not limited to the above embodiment. For example, the fan blade 100 of the following embodiment can also be used.

[0077] For example, as Figure 10 shown, in one embodiment, at least two sets of the blade groups include a first blade group and a second blade group. The blades of the first blade group are first blades 21, and the blades of the second blade group are second blades 22; a partition ring 30 is provided between the first blade group and the second blade assembly; the root of the first blade 21 is connected to the hub 10, the top of the first blade 21 is connected to the partition ring 30, the root of the second blade 22 is connected to the partition ring 30, and the first blade 21 is configured to form an annular structure having a hollow cavity 201.

[0078] In this embodiment, the partition ring 30 is supported and fixed by the first blade 21. When the hub drives the first blade 21 to rotate, the first blade 21 drives the partition ring 30 and the second blade 22 to rotate. The first blade 21 is configured to form an annular structure having a hollow cavity 201. Specifically, the first blade 21 can independently form an annular structure having a hollow cavity 201, or the first blade 21 and the partition ring 30 can jointly construct an annular structure having a hollow cavity 201.

[0079] For another example, in another embodiment, at least two sets of the blade sets include a first blade set and a second blade set. The blades of the first blade set are first blades 21, and the blades of the second blade set are second blades 22. A separation ring 30 is provided between the first blade set and the second blade assembly. The separation ring 30 is connected to the hub 10 through a bracket. The root of the first blade 21 is connected to the hub 10, and the root of the second blade 22 is connected to the separation ring 30. The first blade 21 and / or the second blade 22 are configured to form an annular structure having a hollow cavity 201.

[0080] In this embodiment, the separation ring 30 is fixedly connected to the hub 10 through a bracket. For example, a plurality of outwardly extending connecting rods can be provided in the circumferential direction of the hub as the bracket, and the inner ring surface of the separation ring 30 is fixedly connected to the connecting rod. In this way, the top of the first blade 21 may not be connected to the separation ring 30, so that the shape setting of the first blade 21 is not limited by the separation ring 30. Of course, the top of the first blade 21 can also be connected to the separation ring 30 to make the structure of the separation ring 30 more stable.

[0081] As Figure 12 shown, in one of the embodiments, the fan blade 100 further includes an outer ring body 50, and the outer ring body 50 is disposed around the outermost blade set. By providing the outer ring body 50, the overall structural strength of the fan blade 100 can be further enhanced, and at the same time, it can also play a role in guiding the air flow for the outermost blades, further improving the noise reduction effect.

[0082] For example, in the above embodiment, when there are two sets of blade sets, the second blade set is the outermost blade set, and the fan blade 100 further includes an outer ring body 50 disposed around the second blade set. Among them, the outer ring body 50 can be connected to the top of the second blade 22, and the outer ring body 50 is supported and fixed by the second blade 22, or the outer ring body 50 can also be connected to the separation ring 30 located in the inner circle through a bracket, and the outer ring body 50 is supported by the separation ring 30. In addition, it should be noted that when the second blade 22 is configured to form an annular structure having a hollow cavity 201, it can be that the second blade 22 independently forms an annular structure having a hollow cavity 201; or it can be that the second blade 22 and the outer ring body 50 jointly form an annular structure having a hollow cavity 201.

[0083] As Figure 8As shown, in one embodiment, the suction surface of at least a part of the blades is provided with spoiler protrusions 23. When the fan blade 100 rotates, the airflow passing through the suction surface of the blade is affected by the spoiler protrusions 23, mixing the high-energy fluid outside the boundary layer on the blade surface with the low-energy fluid inside the boundary layer, thereby increasing the kinetic energy of the fluid in the boundary layer, delaying 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. Thus, when the fan blade 100 is operating, the rotational speed can be reduced to ensure the same blowing performance as before while reducing noise, or the blowing performance of the fan blade 100 can be further improved while maintaining the same noise level as before.

[0084] Taking the example where there are two sets of blade groups, optionally, the suction surface of the first blade 21 of the first blade group and / or the suction surface of the second blade 22 of the second blade group is provided with spoiler protrusions 23. Hereinafter, the case where the spoiler protrusions 23 are provided on the suction surface of the first blade 21 will be mainly described as an example.

[0085] Specifically, the first blade 21 has an opposite pressure surface (i.e., the first air guiding surface 21a) and a suction surface (i.e., the first air guiding back surface 21b). The suction surface of the first blade 21 (i.e., the first air guiding back surface 21b) is provided with a plurality of spoiler protrusions 23. The number of spoiler protrusions 23 can be set according to actual needs, and can be one, two, three or more, and no specific limitation is made here. Optionally, the spoiler protrusions 23 are arranged to extend between the leading edge and the trailing edge of the first blade 21, and the extending direction of the spoiler protrusions 23 forms an angle with the airflow direction passing through the suction surface, and the airflow direction is parallel to the tangent direction of the circumference of the hub 10. There is a certain inclination angle between the extending direction of the spoiler protrusions 23 and the airflow direction, so as to achieve a better spoiler effect and further reduce the resistance of the fan blade 100.

[0086] To further enhance the spoiler effect, as Figure 8 shown, in one embodiment, a plurality of the spoiler protrusions 23 are provided, and the plurality of spoiler protrusions 23 are arranged at intervals along the extending direction of the leading edge. So that in the extending direction of the leading edge, the high-energy fluid outside the edge of the first blade 21 is mixed more evenly with the low-energy fluid inside the boundary layer, thereby further increasing the kinetic energy of the fluid in the boundary layer, delaying 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.

[0087] Please refer to Figure 8 and Figure 9, in one embodiment, the plurality of spoiler protrusions 23 include a first spoiler protrusion 23a and a second spoiler protrusion 23b that are alternately and spaced apart along the extending direction of the blade leading edge. An air flow channel that extends along the air flow direction and has open ends is formed between the adjacent first spoiler protrusion 23a and the second spoiler protrusion 23b. The extending direction of the first spoiler protrusion 23a is set at an angle to the extending direction of the second spoiler protrusion 23b.

[0088] In this embodiment, the first spoiler protrusion 23a and the second spoiler protrusion 23b are alternately and spaced apart along the extending direction of the blade leading edge. The extending direction of the first spoiler protrusion 23a and the extending direction of the second spoiler protrusion 23b have a certain angle, so that the air flow channel between the first spoiler protrusion 23a and the second spoiler protrusion 23b generally presents an "eight" shape, and the two open ends of the air flow channel face the air flow direction. When the fan blade 100 rotates, a part of the air flow passing through the suction surface can flow along the air flow channel between the first spoiler protrusion 23a and the second spoiler protrusion 23b, reducing the air flow resistance. At the same time, under the action of the first spoiler protrusion 23a and the second spoiler protrusion 23b, air flow disturbance can be generated. Since the extending directions of the first spoiler protrusion 23a and the second spoiler protrusion 23b are not consistent, the air flow disturbance effect can be further enhanced, thereby further increasing the fluid kinetic energy in the boundary layer, delaying 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.

[0089] As Figure 9 shown, in one embodiment, taking the adjacent first spoiler protrusion 23a and the second spoiler protrusion 23b as a set of protrusions, in the set of protrusions, the first spoiler protrusion 23a is located on the side of the second spoiler protrusion 23b away from the hub 10; taking the straight line that is located in the air flow channel in the set of protrusions and is parallel to the air flow direction as the reference line, the first spoiler protrusion 23a extends obliquely backward from the front toward the side away from the reference line, and the second spoiler protrusion 23b extends obliquely backward from the front toward the side away from the reference line.

[0090] In this embodiment, within the same set of raised portions, the first spoiler raised portion 23a and the second spoiler raised portion 23b have opposite inclination directions with respect to the reference line, such that the distance between the first spoiler raised portion 23a and the second spoiler raised portion 23b (i.e., the width of the air flow channel) gradually increases from the side near the leading edge of the blade toward the side near the trailing edge of the blade. And in two adjacent sets of raised portions, the width of the air flow channel formed between the second spoiler raised portion 23b in one set of raised portions and the first spoiler raised portion 23a in the adjacent other set of raised portions gradually decreases from the side near the leading edge of the blade toward the side near the trailing edge of the blade. Thus, overall, the shapes of any two adjacent air flow channels are different. For example, if one air flow channel is configured to be gradually expanding from the leading edge of the blade toward the trailing edge of the blade, then the adjacent other air flow channel is configured to be gradually contracting from the leading edge of the blade toward the trailing edge of the blade. In this way, the spoiler effect on the boundary layer of the air flow passing through two adjacent air flow channels can be further enhanced.

[0091] In order to enable the air flow passing through the first spoiler raised portion 23a to achieve a better spoiler effect, as Figure 9 shown, in one embodiment, a first included angle α is formed between the extending direction of the first spoiler raised portion 23a and the reference line, where 5° ≤ α ≤ 80°. Preferably, 10° ≤ α ≤ 50°.

[0092] In order to enable the air flow passing through the second spoiler raised portion 23b to achieve a better spoiler effect, as Figure 9 shown, in one embodiment, a second included angle β is formed between the extending direction of the second spoiler raised portion 23b and the reference line, where 5° ≤ β ≤ 80°. Preferably, 10° ≤ β ≤ 50°.

[0093] It should be noted that the above-setting conditions for the first included angle α and the second included angle β can be satisfied alternatively or simultaneously. Preferably, 5° ≤ α ≤ 80°, 5° ≤ β ≤ 80°. More preferably, 10° ≤ α ≤ 50°, 10° ≤ β ≤ 50°. Additionally, within the same set of raised portions, the angle settings of the first included angle α and the second included angle β can be the same or different.

[0094] It can be understood that when the fan blade 100 rotates, the air flow flows from the leading edge of the blade toward the trailing edge of the blade, and the fluid energy near the leading edge of the blade is relatively large. In order to better mix the high-energy fluid outside the boundary layer on the surface of the first blade 21 with the low-energy fluid inside the boundary layer and further ensure the spoiler effect, in one embodiment, the spoiler raised portion 23 is located on the suction surface of the first blade 21 near the leading edge of the blade.

[0095] The spoiler protrusion 23 protrudes from the suction surface of the first blade 21 towards the side away from the suction surface, and the vertical distance between the side of the spoiler protrusion 23 away from the suction surface and the suction surface is the height of the spoiler protrusion 23. Among them, the height of the spoiler protrusion 23 can be kept consistent or can vary in the extending direction of the spoiler protrusion 23. The spoiler protrusion 23 has a lateral surface facing the hub 10, and according to the height setting of the spoiler protrusion 23, the shape of the lateral surface of the spoiler protrusion 23 will also be different. Among them, the shape of the lateral surface of the spoiler protrusion 23 includes but is not limited to being set in a triangular, trapezoidal, rectangular or other special-shaped manner. In addition, it should also be noted that when the number of spoiler protrusions 23 is set to be multiple, the shapes of the multiple spoiler protrusions 23 can be exactly the same or not exactly the same.

[0096] In order to achieve a better spoiler effect, in one embodiment, the length of the spoiler protrusion 23 is i, and the height of the spoiler protrusion 23 is h, where h ≤ i ≤ 10h. In this embodiment, the ratio of the length i of the spoiler protrusion 23 to the height h of the spoiler protrusion 23 can be designed as any value from 1 to 10. Preferably, 2h ≤ i ≤ 5h.

[0097] Similarly, the suction surface of the second blade 22 can also be provided with a spoiler protrusion 23. Specifically, as Figure 8 shown, in one embodiment, the second blade 22 includes a front blade body 221 and a rear blade body 222, and the suction surface of the front blade body 221 (i.e., the front air guiding back surface 221b) and / or the suction surface of the rear blade body 222 (i.e., the rear air guiding back surface 222b) is provided with a spoiler protrusion 23. Among them, for the specific shape and installation position of the spoiler protrusion 23, reference can be made to the above embodiment, and details will not be elaborated here one by one.

[0098] Optionally, a third blade can also be provided between any two adjacent first blades 21, and the shape of the third blade is different from that of the first blade 21. In this way, it is possible to avoid the occurrence of the same-frequency resonance of two adjacent blades with the same shape and the superposition of noises, thereby further reducing the noise during the operation of the fan blade 100.

[0099] Optionally, a third blade can also be provided between any two adjacent second blades 22, and the shape of the third blade is different from that of the second blade 22. In this way, it is possible to avoid the occurrence of the same-frequency resonance of two adjacent blades with the same shape and the superposition of noises, thereby further reducing the noise during the operation of the fan blade 100.

[0100] Optionally, a third blade is provided in the hollow cavity 201 of the second blade 22, and the shape of the third blade is different from that of the second blade 22. In this way, it is possible to avoid the occurrence of the same-frequency resonance of two adjacent blades with the same shape and the superposition of noises, thereby further reducing the noise during the operation of the fan blade 100.

[0101] The present invention further provides a fan, which includes a fan blade 100 and a driving member drivingly connected to the fan blade 100, and the driving member is used to drive the fan blade 100 to rotate. The specific structure of the fan blade 100 refers to the above-mentioned embodiments. Since this fan adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here. Among them, this fan may specifically be an axial-flow fan with an axial-flow fan blade 100, and the driving member may specifically adopt a driving motor.

[0102] The present invention further provides a blowing device, which includes a fan blade 100 or a fan. The specific structure of the fan blade 100 or the fan refers to the above-mentioned embodiments. Since this blowing device adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here. Among them, this blowing device includes but is not limited to fan products such as floor fans, ceiling fans, and table fans. This blowing device may also be other devices with axial-flow fan blades 100 (such as the outdoor unit of an air conditioner). By adopting the above-mentioned fan blade 100 or fan, the noise of the blowing device can be effectively reduced, and the user experience can be improved.

[0103] The above are only the preferred embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A fan blade, characterized in that, Comprising: A hub; At least two sets of blade groups arranged radially along the hub, each blade group including a plurality of blades arranged at intervals in the circumferential direction of the hub, and at least one set of the blade groups having blades configured to form an annular structure with a hollow cavity; And A separating ring surrounding the periphery of the hub and located between adjacent two sets of the blade groups; The at least two sets of the blade groups include a first blade group and a second blade group, the blades of the first blade group being first blades, and the blades of the second blade group being second blades; the root of the second blade is connected to the outer peripheral surface of the separating ring, and the second blade is configured to form an annular structure with a hollow cavity; the second blade includes a front blade body and a rear blade body arranged at intervals along the rotation direction of the fan blade, and the hollow cavity is formed between the front blade body and the rear blade body; one end of the front blade body away from the separating ring and one end of the rear blade body away from the separating ring are close to each other and have a preset gap; in the axial projection plane of the fan blade, a preset gap is formed in the circumferential direction of the fan blade between the tail end of the front blade body and the front end of the rear blade body, the preset gap being c, and the outer diameter of the fan blade being D, where 0 < c < 0.2D.

2. The fan blade according to claim 1, characterized in that, The root of the first blade is connected to the hub, and the top of the first blade is connected to the inner peripheral surface of the separating ring.

3. The fan blade according to claim 1, wherein The center line of the front blade body is arranged as an arc convex in the rotation direction of the fan blade, and the center line of the rear blade body is arranged as an arc convex on the side opposite to the rotation direction of the fan blade.

4. The fan blade according to claim 1, wherein The root of the front blade body and the root of the rear blade body are both connected to the separating ring; or, The root of the front blade body is connected to the separating ring, and the root of the rear blade body is connected to the front blade body; or, The root of the rear blade body is connected to the separating ring, and the root of the front blade body is connected to the rear blade body.

5. The fan blade according to claim 2, wherein The first blade and the second blade are arranged opposite to each other; or the first blade and the second blade are at least partially staggered in the circumferential direction of the separating ring.

6. The fan blade according to claim 2, wherein Functional accessories are provided between adjacent two of the first blades; and / or, functional accessories are provided in the hollow cavity of the second blade.

7. The fan blade according to claim 1, wherein The separating ring is provided between the first blade group and the second blade assembly; The root of the first blade is connected to the hub, the top of the first blade is connected to the separating ring, and the first blade is configured to form an annular structure with a hollow cavity; Or, the separating ring is connected to the hub through a bracket, the root of the first blade is connected to the hub, and the first blade is configured to form an annular structure with a hollow cavity.

8. The fan blade according to claim 1, characterized in that, The fan blade further includes an outer ring body surrounding the periphery of the outermost set of the blade groups.

9. The fan blade according to any one of claims 1 to 8, characterized in that, Turbulence protrusions are provided on the suction surfaces of at least some of the blades.

10. A fan, characterized in that, Comprising a fan blade according to any one of claims 1 to 9, and a driving member drivingly connected to the fan blade, the driving member being configured to drive the fan blade to rotate.

11. A hair-drying device, characterized in that, Comprising a fan blade according to any one of claims 1 to 9 or a fan according to claim 10.

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