Fan blade, fan and blowing equipment

Abstract

The invention discloses a fan blade, a fan and blowing equipment, and the fan blade comprises a hub and a fan blade, the at least two blade groups are arranged in the radial direction of the hub, each blade group comprises a plurality of blades which are arranged in the circumferential direction of the hub at intervals, and the blades of at least one blade group form an annular structure with a hollow cavity; and the separation ring is arranged on the periphery of the hub in a surrounding mode and located between every two adjacent blade sets. According to the technical scheme, noise generated when the fan blades operate can be reduced, and meanwhile the radial air blowing range of the fan blades can be enlarged.

Description

Technical Field

[0001] The present invention relates to the technical field of blowing equipment, and in particular to a fan blade, a fan and blowing equipment. Background Art

[0002] Traditional axial flow fan blades are generally single-ring blade structures, that is, a circle of blades is set around the hub of the fan blade. When the fan blade rotates, a large vortex noise is easily generated at the top of the blade (that is, the end of the blade away from the hub), making the fan blade noisy when running; and the air volume of the fan blade is generally concentrated in the middle of the fan blade, while the air volume at the outer edge of the fan blade is small, resulting in a small radial blowing range of the fan blade, affecting the user experience. Summary of the invention

[0003] The main purpose of the present invention is to provide a fan blade, which is intended to reduce the noise during the operation of the fan blade and at the same time increase the radial blowing range of the fan blade.

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

[0005] Wheel hub;

[0006] At least two groups of blade sets are arranged along the radial direction of the hub, each of the blade sets includes a plurality of blades arranged at intervals along the circumference of the hub, and the blades of at least one group of the blade sets form an annular structure with a hollow cavity; and

[0007] A separation ring is arranged around the periphery of the hub and between two adjacent groups of blades.

[0008] 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, the top of the first blade is connected to the inner circumference of the separating ring, the root of the second blade is connected to the outer circumference of the separating ring, and the second blade forms an annular structure with a hollow cavity.

[0009] In one embodiment, the second blade includes a front sheet and a rear sheet arranged at intervals along the rotation direction of the fan blade, and an end of the front sheet away from the separating ring and an end of the rear sheet away from the separating ring are close to each other, and the hollow cavity is formed between the front sheet and the rear sheet.

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

[0011] In one embodiment, the second blade also includes a connecting sheet body arranged 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 with one end of the rear sheet body away from the separating ring, and the air-inducing surface of the front sheet body is connected to the air-inducing back surface of the rear sheet body via the outer connecting surface of the connecting sheet body.

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

[0013] In one embodiment, an end of the front sheet away from the separation ring and an end of the rear sheet away from the separation ring are close to each other and leave a preset gap.

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

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

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

[0017] In one embodiment, 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 separation ring.

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

[0019] In one embodiment, at least two groups of 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 separation ring is provided between the first blade and the second blade, and the second blade is located at the periphery of the separation ring;

[0020] The root of the first blade is connected to the hub, the top of the first blade is connected to the separation ring, the root of the second blade is connected to the separation ring, and the first blade forms an annular structure with a hollow cavity;

[0021] Alternatively, the separating ring is connected to the hub via a bracket, the root of the first blade is connected to the hub, 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 form an annular structure with a hollow cavity.

[0022] In one embodiment, the fan blade also includes an outer ring arranged on the periphery of the second blade group, and the second blade independently constructs an annular structure with a hollow cavity; or the second blade and the outer ring jointly construct an annular structure with a hollow cavity.

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

[0024] In one of the embodiments, at least a portion of the suction surfaces of the blades are provided with flow-disturbing protrusions.

[0025] The present invention further provides a fan, comprising the fan blades as described above, and a driving member drivingly connected to the fan blades, wherein the driving member is used to drive the fan blades to rotate.

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

[0027] The technical solution of the present invention is to set at least two groups of blades in the radial direction of the hub, and each group of blades includes a plurality of blades arranged at intervals along the circumference of the hub, so that when the fan blades rotate, each group of blades can play a blowing role and expand the radial blowing range of the fan blades. And the two adjacent groups of blades are separated by a separation ring, so that when the fan blades rotate, the airflow vortex generated at the top of the blades of the blade group located in the inner circle can be blocked by the separation ring, blocking the shedding vortex at the top of the blades from flowing from the wind-inducing surface of the blades to the wind-inducing back of the blades, suppressing the shedding vortex noise at the top of the blades; and under the blocking effect of the separation ring, the airflow vortex at the top of the blades located in the inner circle can be prevented from directly falling off under the action of centrifugal force, which can further reduce the shedding vortex noise at the top of the blades, thereby reducing the overall noise of the fan blades. In addition, since at least one group of blade groups is constructed to form an annular structure with a hollow cavity, the blades of the annular structure have sheets located on both sides of the hollow cavity, and the sheets located on both sides of the hollow cavity usually have different bending directions and / or bending degrees, so that the shapes of the sheets located on both sides of the hollow cavity are not exactly the same, which can avoid the sheets on both sides of the hollow cavity from resonating at the same frequency and causing noise superposition, thereby further reducing the noise of the fan blades. In addition, the annular structure with a hollow cavity can also form a guide portion, and when the fan blades rotate, the airflow at the tail of the blades can be guided to the air induction back side of the guide portion through the guide portion, thereby avoiding the airflow vortex at the tail of the blades from directly falling off and generating a large shedding vortex noise. Combining the above-mentioned factors, the noise during the operation of the fan blades can be effectively reduced, and the radial blowing range of the fan blades can also be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

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

[0030] Figure 2 for Figure 1 Front oblique view of the middle fan blade;

[0031] Figure 3 for Figure 1 Oblique view of the back of the middle fan blade;

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

[0033] Figure 5 It is a front elevation view of a third embodiment of a fan blade of the present invention;

[0034] Figure 6 It is a front elevation view of a fourth embodiment of a fan blade of the present invention;

[0035] Figure 7 It is a front elevation view of a fifth embodiment of a fan blade of the present invention;

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

[0037] Fig. 9 for Figure 8 A partial enlarged view of the middle A;

[0038] Fig.10 It is a front elevation view of a seventh embodiment of a fan blade of the present invention;

[0039] Fig.11 It is a front elevation view of an eighth embodiment of a fan blade of the present invention;

[0040] Fig.12 It is a front elevation view of a ninth embodiment of the fan blade of the present invention.

[0041] Description of Figure Numbers:

[0042]

[0043]

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such 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 one embodiment of the present invention, the fan blade 100 includes a hub 10, at least two groups of blade groups and a separator ring 30. At least two groups of blade groups are arranged along the radial direction of the hub 10. Each of the blade groups includes a plurality of blades arranged at intervals along the circumference of the hub 10. The blades of at least one group of blade groups form an annular structure with a hollow cavity 201, and the annular structure is a closed or non-closed ring; the separator ring 30 is arranged around the periphery of the hub 10 and between two adjacent groups of blade groups. The separator ring 30 can be connected to the hub 10 by a bracket for fixing, or it can be supported and fixed by the inner ring blades, which is not specifically limited here.

[0050] Specifically, the specific number of blade groups of the fan blade 100 can be two, three or more. Each blade group includes a plurality of blades arranged at intervals along the circumference of the hub 10, and the number of blades in each blade group can be two, three, four, five or more. It should also be noted that the number of blades in different blade groups can be the same or different. For example, if there are two blade groups, Figure 1 As shown, the blade group located in the inner circle includes five blades (such as the first blade 21), and the blade group located in the outer circle also includes five blades (such as the second blade 22). In this case, the number of blades in the inner and outer blade groups is the same; or, as shown in FIG. Figure 4As shown, the blade group located in the inner ring includes seven blades (e.g., the first blade 21), and the blade group located in the outer ring includes five blades (e.g., 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 separator ring 30, and the specific number of separator rings 30 can be determined according to the number of blade groups. For example, when there are two groups of blade groups, one separator ring 30 is provided; when there are three groups of blade groups, two separator rings 30 can be provided. Optionally, the hub 10, the blades and the separator 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 separator ring 30 can also be assembled through an assembly structure.

[0051] In at least two groups of the blade groups, the blades of at least one group of the blade groups form an annular structure with a hollow cavity 201. For example, when there are two groups of blade groups, Figure 1 As shown, the blades of the inner blade group are arranged in a non-annular shape, and the blades of the outer blade group are constructed into an annular structure with a hollow cavity 201. Alternatively, as Fig.10 As shown, the blades of the inner blade group form an annular structure with a hollow cavity 201, and the blades of the outer blade group are arranged in a non-annular shape. Fig.11 As shown, the blades of the inner and outer blade groups both construct an annular structure with a hollow cavity 201. At this time, the shapes of the annular structures constructed by the blades of the inner and outer blade groups can be the same or different. It should be noted that the annular structure can be a closed annular structure or a non-closed annular structure. The so-called closed annular structure means that the circumference of the annular body is continuously connected without a gap; the non-closed annular structure means that a certain part of the circumference of the annular body is disconnected to form a gap, but the whole still presents an annular shape. It should also be noted that when the blades located in the separation ring 30 construct an annular structure with a hollow cavity 201, the blades can independently construct the annular structure, or the blades and the separation ring 30 surrounding it can jointly construct the annular structure.

[0052] The technical solution of the present invention is to set at least two blade groups in the radial direction of the hub 10, and each blade group includes a plurality of blades arranged at intervals along the circumference of the hub 10, so that when the fan blade 100 rotates, each blade group can play a blowing role, and can expand the radial blowing range of the fan blade 100. And the two adjacent blade groups are separated by a separation ring 30, so that when the fan blade 100 rotates, the airflow vortex generated at the top of the blade of the blade group located in the inner circle can be blocked by the separation ring 30, blocking the shedding vortex at the top of the blade from flowing from the blade air induction surface to the blade air induction back, suppressing the shedding vortex noise at the top of the blade; and under the blocking effect of the separation ring 30, it can prevent the airflow vortex at the top of the blade located in the inner circle from directly falling off under the action of centrifugal force, which can further reduce the shedding vortex noise at the top of the blade, thereby reducing the overall noise of the fan blade 100. In addition, since at least one group of blades is constructed to form an annular structure with a hollow cavity 201, the blades of the annular structure have sheets located on both sides of the hollow cavity 201 (e.g., a front sheet 221 and a rear sheet 222), and the sheets located on both sides of the hollow cavity 201 usually have different bending directions and / or bending degrees, so that the shapes of the sheets located on both sides of the hollow cavity 201 are not completely the same, which can avoid the sheets on both sides of the hollow cavity 201 from producing the same frequency resonance and generating noise superposition, so that the noise of the fan blade 100 can be further reduced. In addition, the annular structure with a hollow cavity 201 can also form a guide portion, and when the fan blade rotates, the airflow at the tail of the blade can be guided to the air induction back of the guide portion through the guide portion, thereby avoiding the airflow vortex at the tail of the blade from directly falling off and generating a large shedding vortex noise. Combining the above-mentioned various factors, the noise of the fan blade 100 during operation can be effectively reduced, and the radial blowing range of the fan blade 100 can also be increased.

[0053] like Figures 1 to 3 As shown, 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 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 circumference of the separating ring 30, the root of the second blade 22 is connected to the outer circumference of the separating 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 an inner ring blade group, and the second blade group is an outer ring blade group. The first blade group includes a plurality of first blades 21 arranged at intervals along the circumference of the hub 10, the root of each first blade 21 is connected to the outer peripheral surface of the hub 10, and the top of each first blade 21 is connected to the inner peripheral surface of the separator ring 30. Among them, the first blade 21 can be a conventional non-annular structure, and can also be set to an annular structure. The following mainly takes the first blade 21 as a non-annular structure as an example.

[0055] Specifically, Figure 2 and Figure 3 As shown, the first blade 21 has a certain inclination angle relative to the axial end surface of the hub 10. When the hub 10 rotates, the first blade 21 can cut the air and accelerate the airflow to achieve a blowing effect. The first blade 21 has a first wind-inducing surface 21a and a first wind-inducing back surface 21b relative to each other, wherein the first wind-inducing surface 21a is the side of the first blade 21 shown in the front view of the fan blade 100 (that is, the pressure surface of the first blade 21), and the first wind-inducing back surface 21b is the side of the first blade 21 shown in the back 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 induction surface 21a to the first air induction back surface 21b, thereby suppressing the shedding vortex noise at the top of the first blade 21; and under the blocking effect of the separation ring 30, the airflow vortex at the top of the first blade 21 can be prevented from directly shedding under the action of centrifugal force, which can further reduce the shedding vortex noise at the top of the first blade 21, thereby reducing the overall noise of the fan blade 100. The second blade group includes a plurality of second blades 22 arranged at intervals along the circumference of the separation ring 30, and the root of each second blade 22 is connected to the outer peripheral surface of the separation ring 30. Among them, the second blade 22 constructs an annular structure with a hollow cavity 201. When the fan blade 100 rotates, the airflow vortex generated by the top of the second blade 22 (that is, the end of the second blade 22 away from the separation ring 30) can flow along the annular surface of the annular structure, thereby reducing the shedding vortex noise at the top of the second blade 22. In this way, through the combined effect of the above two aspects, the noise of the fan blade 100 during operation can be greatly reduced.

[0056] Please refer to Figure 1 and Figure 5 In some embodiments, the second blade 22 includes a front sheet 221 and a rear sheet 222 arranged at intervals along the rotation direction of the fan blade 100, and an end of the front sheet 221 away from the separating ring 30 and an end of the rear sheet 222 away from the separating ring 30 are close to each other, and the hollow cavity 201 is formed between the front sheet 221 and the rear sheet 222.

[0057] In this embodiment, the front sheet 221 is in front of the rear sheet 222 in the rotation direction of the fan blade 100. The end of the front sheet 221 away from the separation ring 30 and the end of the rear sheet 222 away from the separation ring 30 are close to each other to construct a ring structure with a hollow cavity 201. For example, in the rotation direction of the fan blade 100, the end of the front sheet 221 away from the separation ring 30 is bent backward, and the end of the rear sheet 222 away from the separation ring 30 is bent forward. At this time, the bending directions of the front sheet 221 and the rear sheet 222 are opposite, so that the end of the front sheet 221 away from the separation ring 30 and the end of the rear sheet 222 away from the separation ring 30 are close to each other. Of course, in some embodiments, the end of the front sheet 221 away from the separation ring 30 may be bent backward, and the end of the rear sheet 222 away from the separation ring 30 may not be bent or may be bent to a small extent. In this case, the bending degrees of the front sheet 221 and the rear sheet 222 are different, so that the end of the front sheet 221 away from the separation ring 30 and the end of the rear sheet 222 away from the separation ring 30 are close to each other. In this way, the front sheet 221 and the rear sheet 222 are different at least in the bending direction or bending degree, so that the shapes of the front sheet 221 and the rear sheet 222 are not completely the same, so that the front sheet 221 and the rear sheet 222 can be prevented from generating the same frequency resonance, and the influence of the noise frequency superposition of the front sheet 221 and the rear sheet 222 on the increase of the noise can be reduced, thereby further reducing the noise of the fan blade 100 when it is running. And the end of the front sheet 221 away from the separation ring 30 and the end of the rear sheet 222 away from the separation ring 30 are close to each other. When the fan blade 100 rotates, the eddy current generated by the end of the front sheet 221 away from the separation ring 30 will be blocked by the end of the rear sheet 222 and will not fall off directly. A part of the eddy current will also flow to the rear sheet 222. In this way, the eddy noise of the top of the front sheet 221 falling off can be reduced, thereby further reducing the noise when the fan blade 100 is running. It should be noted that the end of the front sheet 221 away from the separation ring 30 and the end of the rear sheet 222 away from the separation ring 30 are close to each other, and the degree of closeness can be that there is a small gap between the two, or the two can be in contact or connected. It should be noted that when the end of the front sheet 221 away from the separating ring 30 and the end of the rear sheet 222 away from the separating ring 30 are close to each other and form a certain gap, the portion of the separating ring 30 corresponding to the gap constitutes a part of the hollow cavity 301; that is, the front sheet 221, the rear sheet 222 and the separating ring 30 jointly construct the hollow cavity 301.

[0058] like Figure 1As shown, in one embodiment, the center line of the front sheet 221 (hereinafter referred to as the first center line 2211) is set as an arc line that bulges toward 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 set as an arc line that bulges 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 between the front 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 between the front edge and the trailing edge of the rear sheet 222. The first center line 2211 is set in an arc that bulges toward the rotation direction of the blade 100. When viewed from the rotation direction of the blade 100, the first center line 2211 is bent backward along the axis of the hub 10, so that the front sheet 221 as a whole presents a shape that bends backward in the rotation direction of the blade 100; the second center line 2221 is set in an arc that bulges toward the side opposite to the rotation direction of the blade 100. When viewed from the rotation direction of the blade 100, the second center line 2221 is bent forward along the axis of the hub 10, so that the rear sheet 222 as a whole presents a shape that bends forward in the rotation direction of the blade 100. That is, in the rotation direction of the fan blade 100, the front sheet 221 and the rear sheet 222 are bent in opposite directions, and the top of the front sheet 221 and the top of the rear sheet 222 are close to each other, thereby constructing an annular structure with a hollow cavity 201. Such a configuration is more conducive to guiding the vortex 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] like Figure 1 and Figure 2 As shown, in one embodiment, the second blade 22 also includes a connecting sheet body 223 arranged opposite to the outer peripheral surface of the separating ring 30, and the connecting sheet body 223 connects the end of the front sheet body 221 away from the separating ring 30 with the end of the rear sheet body 222 away from the separating ring 30, and the air-inducing surface of the front sheet body 221 is connected to the air-inducing back surface of the rear sheet body 222 via the outer connecting surface 223a of the connecting sheet body 223.

[0061] Specifically, Figure 2 and Figure 3As shown, the side of the front sheet 221 facing the rotation direction of the fan blade 100 is the wind-inducing surface of the front sheet 221 (hereinafter referred to as the front wind-inducing surface 221a), and the other side of the front sheet 221 is the wind-inducing back side of the front sheet 221 (hereinafter referred to as the front wind-inducing back side 221b); the side of the rear sheet 222 facing the rotation direction of the fan blade 100 is the wind-inducing surface of the rear sheet 222 (hereinafter referred to as the rear wind-inducing surface 222a), and the other side of the rear sheet 222 is the wind-inducing back side of the rear sheet 222 (hereinafter referred to as the rear wind-inducing back side 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 structure, so that the overall structural strength of the second blade 22 is higher and more stable. The front air induction surface 221a, the outer connecting surface 223a and the rear air induction back surface 222b are connected in sequence, so that the airflow vortex at the tail of the front air induction surface 221a can flow along the outer connecting surface 223a to the rear air induction back surface 222b, which can effectively reduce the vortex noise at the tail of the front sheet 221, thereby effectively reducing the noise of the fan blade 100 when it is running.

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

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

[0065] like Figure 5As shown, in one embodiment, the end of the front sheet 221 away from the separation ring 30 and the end of the rear sheet 222 away from the separation ring 30 are close to each other and leave a preset gap 224. 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 sheet 222, part of the airflow vortex generated at the top of the front sheet 221 can be dispersed; at the same time, part of the airflow vortex generated at the top of the front sheet 221 can also flow to the rear sheet 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 surface of the fan blade 100, a preset gap is formed between the tail end of the front sheet 221 and the front end of the rear sheet 222 in the circumferential direction of the fan blade 100, and the preset gap is c, and the outer diameter of the fan blade 100 is D, wherein 0<c<0.2D.

[0067] It is understandable that the smaller the preset gap is, the more conducive it is for the eddy current at the tail end of the front sheet 221 to flow to the rear sheet 222, thereby reducing the noise of the fan blade 100. In this embodiment, c<0.2D, so that the preset gap between the tail end of the front sheet 221 and the front end of the rear sheet 222 is not too large, which is conducive to the eddy current at the tail end of the front sheet 221 to flow to the rear sheet 222, thereby achieving a better noise reduction effect. In order to further optimize the noise reduction effect, optionally, 0<c<0.05D.

[0068] In one embodiment, the projection of the rear end of the front sheet 221 on the axis of the hub 10 at least partially overlaps with the projection of the front end of the rear sheet 222 on the axis of the hub 10. In this way, the projections of the rear end of the front sheet 221 and the front end of the rear sheet 222 on the axial direction of the hub 10 have a certain overlap section, which is more conducive to the eddy current at the rear end of the front sheet 221 flowing to the rear sheet 222 when the fan blade 100 rotates, thereby further improving the noise reduction effect.

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

[0070] In order to further improve the noise reduction effect, in some embodiments, the end of the front sheet 221 away from the separation ring 30 and the end of the rear sheet 222 away from the separation ring 30 are close to each other and leave a preset gap 224, and the end of the front sheet 221 away from the separation ring 30 and / or the end of the rear sheet 222 away from the separation ring 30 are provided with a bending portion. By providing the bending portion, the airflow of the corresponding sheet can be effectively blocked from flowing from the high-pressure side to the low-pressure side, thereby reducing the generation of vortices, and further reducing the noise generated at the corresponding sheet, which is conducive to further reducing the noise of the fan blade 100.

[0071] There are many specific ways to connect the root of the front sheet 221 and the root of the rear sheet 222 with the separation ring 30, as long as it is possible to construct a ring structure with a hollow cavity 201. For example, in one embodiment, Figure 1 As shown, the root of the front sheet 221 and the root of the rear sheet 222 are both connected to the separation ring 30; or, as shown Figure 6 As shown, in another embodiment, the root of the front sheet 221 is connected to the separation ring 30, and the root of the rear sheet 222 is connected to the front sheet 221; or, in other embodiments, the root of the rear sheet 222 is connected to the separation ring 30, and the root of the front sheet 221 is connected to the rear sheet 222.

[0072] The number and relative position 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. Figure 1 As shown, the number of the first blades 21 and the second blades 22 is the same, and the two are arranged one by one. In another embodiment, the first blades 21 and the second blades 22 are at least partially staggered in the circumferential direction of the separation ring 30. For example, Figure 4 As shown, the number of the first blades 21 is greater than the number of the second blades 22 , and the first blades 21 and the second blades 22 are at least partially staggered in the circumferential direction of the separation 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 attachment 40 is provided between two adjacent first blades 21; and / or a functional attachment 40 is provided in the hollow cavity 201 of the second blade 22. The functional attachment 40 includes but is not limited to a purification component, a mosquito repellent component, an aromatherapy component, a heating component, a humidification component, and the like.

[0074] For example, traditional axial flow fans generally do not have an air purification function. Some hair dryers achieve the purification function by adding a purification component on the air inlet side of the fan blade, which 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. Figure 7 As shown, in one embodiment, a purification member 40 is provided between two adjacent first blades 21; and / or, a purification member 40 is provided in the hollow cavity 201 of the second blade 22. There may be many specific types of the purification member 40, including but not limited to one or a combination of filters (such as primary filter, high efficiency filter, activated carbon filter, etc.), negative ion generators, etc.

[0075] The specific assembly method of the purification component 40 and the fan blade 100 can be integrally formed, or can be detachably assembled using assembly structures such as buckles and screws. Optionally, the purification component 40 and the fan blade 100 are integrally injection molded. Taking the purification component 40 as an example, the filter screen and the fan blade 100 can be integrally injection molded by an insert injection molding process during manufacturing. The molding process is simple, the structure is stable and reliable, and the subsequent assembly process can be omitted, thereby improving production efficiency and reducing production costs.

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

[0077] For example, Fig.10 As shown, 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 21, and the blades of the second blade group are second blades 22; the separating 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 separating ring 30, the root of the second blade 22 is connected to the separating ring 30, and the first blade 21 is configured to form an annular structure with a hollow cavity 201.

[0078] In this embodiment, the separation 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 separation ring 30 and the second blade 22 to rotate. The first blade 21 forms an annular structure with a hollow cavity 201. Specifically, the first blade 21 can independently form an annular structure with a hollow cavity 201, or the first blade 21 and the separation ring 30 can jointly form an annular structure with a hollow cavity 201.

[0079] For another example, in another 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 21, and the blades of the second blade group are second blades 22; the separating ring 30 is provided between the first blade group and the second blade assembly; the separating 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 separating ring 30, and the first blade 21 and / or the second blade 22 form an annular structure with a hollow cavity 201.

[0080] In this embodiment, the separator ring 30 is connected and fixed to the hub 10 through a bracket. For example, a plurality of connecting rods extending outwards may be provided in the circumference of the hub as brackets, and the inner annular surface of the separator ring 30 is connected and fixed to the connecting rods. In this way, the top of the first blade 21 may not be connected to the separator ring 30, so that the shape setting of the first blade 21 is not restricted by the separator ring 30. Of course, the top of the first blade 21 may also be connected to the separator ring 30, so that the structure of the separator ring 30 is more stable.

[0081] like Fig.12 As shown, in one embodiment, the fan blade 100 further includes an outer ring body 50, and the outer ring body 50 is arranged around the outer periphery of the blade group located in the outermost circle. The outer ring body 50 can further enhance the overall structural strength of the fan blade 100, and can also guide the wind for the outermost circle blades, further improving the noise reduction effect.

[0082] For example, in the above embodiment, when two blade groups are provided, the second blade group is the outermost blade group, and the fan blade 100 also includes an outer ring body 50 surrounding the outer periphery of the second blade group. 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 separator ring 30 located in the inner circle through a bracket, and the outer ring body 50 is supported by the separator ring 30. In addition, it should be noted that when the second blade 22 constructs an annular structure with a hollow cavity 201, the second blade 22 can independently construct an annular structure with a hollow cavity 201; or the second blade 22 and the outer ring body 50 can jointly construct an annular structure with a hollow cavity 201.

[0083] like Figure 8As shown, in one embodiment, at least part of the suction surface of the blade is provided with a spoiler protrusion 23. When the fan blade 100 rotates, the airflow passing through the suction surface of the blade, under the influence of the spoiler protrusion 23, mixes the high-energy fluid outside the boundary layer of the blade surface with the low-energy fluid in 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; in this way, when the fan blade 100 is working, the speed can be reduced to ensure that the noise is reduced while the blowing performance remains unchanged, or the blowing performance of the fan blade 100 can be further improved while the noise remains the same as before.

[0084] Taking the example of two 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 a spoiler protrusion 23. The following mainly describes the example of providing a spoiler protrusion 23 on the suction surface of the first blade 21.

[0085] Specifically, the first blade 21 has a relative pressure surface (i.e., the first air-inducing surface 21a) and a suction surface (i.e., the first air-inducing back surface 21b). The suction surface (i.e., the first air-inducing back surface 21b) of the first blade 21 is provided with a spoiler protrusion 23, and the number of spoiler protrusions 23 can be set according to actual needs, and can be one, two, three or more, which is not specifically limited here. Optionally, the spoiler protrusion 23 is extended between the leading edge and the trailing edge of the first blade 21, and the extension direction of the spoiler protrusion 23 is set at an angle to 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 extension direction of the spoiler protrusion 23 and the airflow direction, so that a better spoiler effect can be achieved, further reducing the resistance of the fan blade 100.

[0086] In order to further enhance the spoiler effect, Figure 8 As shown, in one embodiment, the spoiler protrusion 23 is provided with a plurality of spoiler protrusions 23, and the plurality of spoiler protrusions 23 are arranged at intervals along the extension direction of the leading edge of the blade, so that in the extension direction of the leading edge of the blade, the high-energy fluid outside the edge of the first blade 21 and the low-energy fluid in the boundary layer are mixed more evenly, 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 Fig. 9In one embodiment, the plurality of spoiler protrusions 23 include first spoiler protrusions 23a and second spoiler protrusions 23b that are alternately and spaced apart along the extension direction of the leading edge of the blade, and an airflow channel extending along the airflow direction and open at both ends is formed between adjacent first spoiler protrusions 23a and second spoiler protrusions 23b, and the extension direction of the first spoiler protrusion 23a is angled with the extension direction of the second spoiler protrusion 23b.

[0088] In the present embodiment, the first spoiler protrusion 23a and the second spoiler protrusion 23b are arranged alternately and at intervals along the extension direction of the leading edge of the blade, and the extension direction of the first spoiler protrusion 23a and the extension direction of the second spoiler protrusion 23b have a certain angle, so that the airflow channel between the first spoiler protrusion 23a and the second spoiler protrusion 23b generally presents an "eight" shape, and the two openings of the airflow channel face the airflow direction. When the fan blade 100 rotates, a part of the airflow passing through the suction surface can flow along the airflow channel between the first spoiler protrusion 23a and the second spoiler protrusion 23b, reducing the airflow resistance, and at the same time, spoilers can be generated under the action of the first spoiler protrusion 23a and the second spoiler protrusion 23b. Since the extension directions of the first spoiler protrusion 23a and the second spoiler protrusion 23b are inconsistent, the spoiler effect can be further improved, thereby further improving 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] like Fig. 9 As shown, in one embodiment, the adjacent first spoiler protrusion 23a and the second spoiler protrusion 23b are used as a protrusion group, in which the first spoiler protrusion 23a is located on the side of the second spoiler protrusion 23b away from the wheel hub 10; a straight line in the protrusion group located in the airflow channel and parallel to the airflow direction is used as a reference line, the first spoiler protrusion 23a is obliquely extended from front to rear toward the side away from the reference line, and the second spoiler protrusion 23b is obliquely extended from front to rear toward the side away from the reference line.

[0090] In the present embodiment, in the same protrusion group, the first spoiler protrusion 23a and the second spoiler protrusion 23b are opposite in inclination direction relative to the reference line, so that the distance between the first spoiler protrusion 23a and the second spoiler protrusion 23b (i.e. the width of the airflow channel) gradually increases from the side close to the leading edge of the blade toward the side of the trailing edge of the blade. And in two adjacent protrusion groups, the width of the airflow channel formed between the second spoiler protrusion 23b in one protrusion group and the first spoiler protrusion 23a in another adjacent protrusion group gradually decreases from the side of the leading edge of the blade toward the side of the trailing edge of the blade. In this way, from the overall point of view, the shapes of any two adjacent airflow channels are different, for example, one airflow channel is gradually expanded from the leading edge of the blade toward the trailing edge of the blade, and another adjacent airflow channel is gradually contracted from the leading edge of the blade toward the trailing edge of the blade. In this way, the spoiler effect of the boundary layer of the airflow passing through the two adjacent airflow channels can be further improved.

[0091] In order to achieve a better spoiler effect for the airflow passing through the first spoiler protrusion 23a, as shown in FIG. Fig. 9 As shown, in one embodiment, a first angle α is formed between the extension direction of the first spoiler protrusion 23a and the reference line, wherein 5°≤α≤80°. Preferably, 10°≤α≤50°.

[0092] In order to achieve a better spoiler effect for the airflow passing through the second spoiler protrusion 23b, as shown in FIG. Fig. 9 As shown, in one embodiment, a second angle β is formed between the extension direction of the second spoiler protrusion 23b and the reference line, wherein 5°≤β≤80°. Preferably, 10°≤β≤50°.

[0093] It should be noted that the above-mentioned setting conditions for the first angle a and the second angle β can be satisfied either one or both. Preferably, 5°≤α≤80°, 5°≤β≤80°. Further preferably, 10°≤α≤50°, 10°≤β≤50°. In addition, in the same group of protrusions, the angle settings of the first angle a and the second angle β can be the same or different.

[0094] It can be understood that when the fan blade 100 rotates, the airflow flows from the leading edge of the blade to the trailing edge of the blade, and the fluid energy near the leading edge of the blade is relatively large. In order to better achieve the mixing of 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 turbulence effect, in one embodiment, the turbulence protrusion 23 is located on the side of the suction surface of the first blade 21 close to the leading edge of the blade.

[0095] The spoiler protrusion 23 protrudes from the suction surface of the first blade 21 toward 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 consistent in the extension direction of the spoiler protrusion 23, or it can be changed. The spoiler protrusion 23 has a lateral surface facing the hub 10, and the shape of the lateral surface of the spoiler protrusion 23 will also be different according to the height setting of the spoiler protrusion 23. Among them, the shape of the lateral surface of the spoiler protrusion 23 includes but is not limited to a triangle, a trapezoid, a rectangle or other special-shaped settings. In addition, it should be noted that when the number of spoiler protrusions 23 is set in 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, wherein 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 to be any value from 1 to 10. Preferably, 2h≤i≤5h.

[0097] Similarly, the suction surface of the second blade 22 may also be provided with a spoiler protrusion 23. Specifically, Figure 8 As shown, in one embodiment, the second blade 22 includes a front sheet 221 and a rear sheet 222, wherein the suction surface of the front sheet 221 (i.e., the front air induction back surface 221b) and / or the suction surface of the rear sheet 222 (i.e., the rear air induction back surface 222b) is provided with a spoiler protrusion 23. The specific shape and setting position of the spoiler protrusion 23 can be referred to the above embodiment, and will not be repeated here.

[0098] Optionally, a third blade may be provided between any two adjacent first blades 21 , and the third blade has a different shape from the first blade 21 . This can avoid the same-frequency resonance of two adjacent blades of the same shape and the superposition of noise, thereby further reducing the noise of the fan blade 100 during operation.

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

[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 same-frequency resonance of two adjacent blades of the same shape and the superposition of noise, thereby further reducing the noise of the fan blade 100 during operation.

[0101] The present invention also proposes a fan, comprising a fan blade 100 and a driving member connected to the fan blade 100, wherein 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 embodiment. Since the fan adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the fan can be specifically an axial flow fan with axial flow fan blades 100, and the driving member can specifically be a driving motor.

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

[0103] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fan blade, characterized in that: include: Wheel hub; At least two groups of blade sets are arranged along the radial direction of the hub, each of the blade sets includes a plurality of blades arranged at intervals along the circumference of the hub, and the blades of at least one group of the blade sets form an annular structure with a hollow cavity; and A separation ring is arranged around the periphery of the hub and between two adjacent groups of blades.

2. The fan blade according to claim 1, characterized in that: At least two groups of 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 circumference of the separating ring, the root of the second blade is connected to the outer circumference of the separating ring, and the second blade forms an annular structure with a hollow cavity.

3. The fan blade according to claim 2, characterized in that: The second blade includes a front sheet and a rear sheet arranged at intervals along the rotation direction of the fan blade, and an end of the front sheet away from the separating ring and an end of the rear sheet away from the separating ring are close to each other, and the hollow cavity is formed between the front sheet and the rear sheet.

4. The fan blade according to claim 3, characterized in that: The center line of the front sheet is arranged in an arc line that is convex toward the rotation direction of the fan blades, and the center line of the rear sheet is arranged in an arc line that is convex toward the side opposite to the rotation direction of the fan blades.

5. The fan blade according to claim 3, characterized in that: The second blade also includes a connecting sheet body arranged 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 with one end of the rear sheet body away from the separating ring, and the air-inducing surface of the front sheet body is connected to the air-inducing back surface of the rear sheet body via the outer connecting surface of the connecting sheet body.

6. The fan blade according to claim 5, characterized in that: The air induction surface of the rear sheet is connected to the air induction back surface of the front sheet via the inner connecting surface of the connecting sheet, and the air induction surface of the rear sheet and the air induction back surface of the front sheet are at least partially staggered in the axial direction of the separation ring.

7. The fan blade according to claim 3, characterized in that: One end of the front sheet body away from the separation ring and one end of the rear sheet body away from the separation ring are close to each other and leave a preset gap.

8. The fan blade according to claim 3, characterized in that: The root of the front sheet and the root of the rear sheet are both connected to the separation ring; or, The root of the front sheet is connected to the separation ring, and the root of the rear sheet is connected to the front sheet; or, The root of the rear sheet is connected to the separation ring, and the root of the front sheet is connected to the rear sheet.

9. The fan blade according to claim 2, characterized in that: 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 separation ring.

10. The fan blade according to claim 2, characterized in that: A functional accessory is provided between two adjacent first blades; and / or a functional accessory is provided in the hollow cavity of the second blade.

11. The fan blade according to claim 1, characterized in that: At least two groups of 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 separation ring is provided between the first blade group and the second blade group; The root of the first blade is connected to the hub, the top of the first blade is connected to the separation ring, the root of the second blade is connected to the separation ring, and the first blade forms an annular structure with a hollow cavity; Alternatively, the separation ring is connected to the hub via a bracket, the root of the first blade is connected to the hub, the root of the second blade is connected to the separation ring, and the first blade and / or the second blade form an annular structure with a hollow cavity.

12. The fan blade according to claim 1, characterized in that: The fan blade also includes an outer ring body, which is arranged around the periphery of the blade group in the outermost circle.

13. The fan blade according to any one of claims 1 to 12, characterized in that: At least part of the suction surfaces of the blades are provided with flow-turbulating protrusions.

14. A fan, characterized in that: It comprises a fan blade as described in any one of claims 1 to 13, and a driving member drivingly connected to the fan blade, wherein the driving member is used to drive the fan blade to rotate.

15. A blowing device, characterized in that: It comprises the fan blade according to any one of claims 1 to 13 or the fan according to claim 14.

Images