Fan blade, fan, and air-blowing device

Abstract

A fan blade, a fan, and an air-blowing device. The fan blade (100) comprises: a hub (110) and a blade assembly (120), wherein the blade assembly (120) comprises N blades (121) connected to the hub (110), at least one blade (121) being provided with a hollow region (122); and on a first projection plane (130) perpendicular to the axis of the hub (110), the orthographic projection of the blade (121) forms a first projection (131) with an area of S1, and the orthographic projection of the hollow region (122) forms a second projection (132) with an area of S2, wherein 0≤S2 / S1≤10. In the fan blade, the size of the hollow region is limited, thereby reducing fan noise and improving the performance of the fan blade.

Description

Fans, fans and blowing equipment

[0001] This application claims priority to Chinese patent applications No. 202323666364.7 and No. 202311869798.9 filed on December 29, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of blowing equipment, and in particular to a fan blade, a fan and a blowing equipment. Background Art

[0003] Air conditioners are widely used in daily life. Axial-flow fan-type air conditioners, such as floor fans, are particularly popular due to their high wind power and wide air coverage. Existing axial-flow fan-type air conditioners primarily utilize multiple solid blades extending from a hub. When used at high speeds, these air conditioners often generate considerable noise, causing discomfort to users. Technical issues

[0004] The main purpose of this application is to propose a fan blade that is designed to effectively reduce the noise during fan operation. Technical Solutions

[0005] To achieve the above objectives, the fan blade proposed in this application includes:

[0006] wheel hubs; and

[0007] a blade assembly comprising N blades, where N is an integer greater than or equal to 1;

[0008] The blades are connected to the hub, and at least one of the blades is provided with a hollow area;

[0009] On a first projection plane perpendicular to the hub axis, the orthographic projection of the blade forms a first projection with an area of ​​S1, and the orthographic projection of the hollow area forms a second projection with an area of ​​S2, 0≤S2 / S1≤10; and / or,

[0010] On a second projection plane parallel to the hub axis, the orthographic projection of the blade forms a third projection with an area of ​​S3, and the orthographic projection of the hollow area forms a fourth projection with an area of ​​S4, where 0≤S4 / S3≤10.

[0011] In one embodiment, each of the N blades of the blade assembly is provided with a hollow region, an area S1 is the sum of the areas of the first projections of the blades on the first projection plane, and an area S2 is the sum of the areas of the second projections of the hollow regions on the first projection plane.

[0012] The area S3 is the sum of the areas of the third projections of the blades on the second projection plane, and the area S4 is the sum of the areas of the fourth projections of the hollow areas on the second projection plane.

[0013] In one embodiment, 0≤S2 / S1≤5.

[0014] In one embodiment, 0≤S2 / S1≤4.

[0015] In one embodiment, 0≤S4 / S3≤4.

[0016] In one embodiment, the outer contour of the fan blade has a first diameter D1, the hub has a second diameter D2, and the blade flow area is; and satisfies 0<(S1+S2) / (S-S1-S2)≤0.9.

[0017] In one embodiment, the outer contour of the fan blade has a first diameter D1, the hub has a second diameter D2, the maximum width of the blade in the axial direction of the hub is H, the blade has a reference area S'= (D1-D2)H, and S', S4, and S3 satisfy 0.1≤(S4+S3) / S'≤1.

[0018] In one embodiment, 0.4≤(S4+S3) / S'≤1.

[0019] In one embodiment, 0.6≤(S4+S3) / S′≤1.

[0020] In one embodiment, the outer contour of the fan blade has a first diameter D1, the maximum width of the blade in the axial direction of the hub is H, and satisfies 0.02≤H / D1≤1.

[0021] In one embodiment, 0.02≤H / D1≤0.5.

[0022] In one embodiment, 2≤N≤9.

[0023] In one embodiment, 4≤N≤7.

[0024] In one embodiment, at least one of the blades comprises a first segment and a second segment, and at least parts of the first segment and the second segment are spaced apart in the circumferential and / or axial direction of the hub;

[0025] The first segment and the second segment surround and form the hollow area.

[0026] In one embodiment, the blade further includes a bridging segment, which connects the outer end of the first segment and the outer end of the second segment, and an arc connection is formed between the first segment, the bridging segment and the second segment, and the first segment, the second segment, the bridging segment and the hub are jointly arranged to form the hollow area.

[0027] In one embodiment, the inner end of the first segment and the inner end of the second segment are respectively connected to the hub;

[0028] Alternatively, the inner end of the first segment is connected to the side edge of the second segment, and the inner end of the second segment is connected to the hub;

[0029] Alternatively, the inner end of the first segment and the inner end of the second segment are connected and are simultaneously connected to the hub.

[0030] In the air inlet direction of the fan blade, the first segment is located upstream.

[0031] In one embodiment, a filter is provided in the hollow area.

[0032] The present application also proposes 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.

[0033] The present application also proposes a blowing device, comprising the fan blades or the fan as described above. Beneficial effects

[0034] The technical solution of the present application is to connect N blades on the hub, and at least one blade is used to construct a hollow area. On the first projection plane perpendicular to the axis of the hub, the blade forms a first projection with an area of ​​, and the hollow area forms a second projection with an area of ​​, 0≤S2 / S1≤10. S2 / S1 is set as the axial annular area ratio of the blade. When the axial annular area ratio of the blade is 0≤S2 / S1≤10, along the circumference of the hub, the hollow area can effectively weaken the wake of some blades on its upstream side and the potential flow effect of some blades on its downstream side, and reduce the airflow interference effect of some blades on both sides of the hollow area, so that at the same speed, the noise generated by the fan is smaller and the power it consumes is also lower.

[0035] On a second projection plane parallel to the hub axis, the blades form a third projection with an area of ​​S3, and the hollow region forms a fourth projection with an area of ​​S4, where 0≤S4 / S3≤10. S4 / S3 is set as the lateral annular area ratio of the blades. When the lateral annular area ratio of the blades is 0≤S4 / S3≤10, the hollow region can effectively weaken the wake of the upstream portion of the blades and the potential flow of the downstream portion of the blades along the axial direction of the hub, reducing the airflow interference of the blades on both sides of the hollow region. As a result, at the same speed, the fan generates less noise and consumes less power.

[0036] Therefore, in this solution, by limiting the size of the axial and / or lateral projection of the hollow area, the size of the hollow area is limited, thereby adjusting the airflow and acoustic performance of the fan blade, reducing the noise generated by the fan, and increasing the fan work, thereby improving the performance of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0038] FIG1 is a schematic structural diagram of a fan blade according to a first embodiment of the present invention;

[0039] FIG2 is a schematic structural diagram of a second embodiment of a fan blade of the present application;

[0040] FIG3 is a projection diagram of the fan blade in FIG2 on a first projection plane;

[0041] FIG4 is a projection diagram of the fan blade in FIG1 formed by orthographic projection on the first projection plane;

[0042] FIG5 is a diagram showing the relationship between the axial annular area ratio of the fan blade in FIG4 and the noise generated;

[0043] FIG6 is a diagram showing the relationship between the axial annular area ratio of the fan blade and the power consumed by the fan blade in FIG4;

[0044] FIG7 is a projection diagram of the fan blade in FIG2 formed on a second projection plane;

[0045] FIG8 is a projection diagram of the blade in FIG7 formed on the mid-vertical plane;

[0046] FIG9 is a diagram showing the relationship between the lateral annular center area ratio of the fan blade in FIG8 and the noise generated;

[0047] FIG10 is a graph showing the relationship between the lateral annular center area ratio of the fan blade and the power consumed in FIG8 ;

[0048] FIG11 is a graph showing the relationship between the ratio of the lateral projection area of ​​the fan blade to the reference area and the noise generated by the fan blade in FIG8 ;

[0049] FIG12 is a graph showing the relationship between the ratio of the lateral projection area of ​​the fan blade to the reference area and the power consumed by the fan blade in FIG8 ;

[0050] FIG13 is a projection diagram of a fan blade in a third embodiment of the present application formed on a first projection plane;

[0051] FIG14 is a schematic structural diagram of a fourth embodiment of a fan blade of the present application;

[0052] FIG15 is a schematic structural diagram of a fifth embodiment of a fan blade of the present application;

[0053] FIG16 is a schematic structural diagram of the sixth embodiment of the fan blade of the present application.

[0054] Description of Figure Numbers:

[0055] Reference numeral name Reference numeral name 100 blade 126 pressure surface 110 hub 127 bridge segment 120 blade assembly 130 first projection plane 121 blade 131 first projection 122 hollow area 132 second projection 123 first segment 140 second projection plane 124 second segment 141 third projection 125 suction surface 142 fourth projection

[0056] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0057] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] It should be noted that if the embodiments of the present application involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0059] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B as an example", it includes Solution A, or Solution B, or a solution in which both A and B are satisfied. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0060] The present application proposes a fan blade 100 .

[0061] In the embodiment of the present application, as shown in FIG. 1 to FIG. 16 , the fan blade 100 includes:

[0062] Wheel hub 110;

[0063] The blade assembly 120 includes N blades 121, where N is an integer greater than or equal to 1;

[0064] The blades 121 are connected to the hub 110 , and at least one blade 121 is provided with a hollow area 122 ;

[0065] On a first projection plane 130 perpendicular to the axis of the hub 110 , the blade 121 is projected to form a first projection 131 with an area of ​​S1, and the hollow area 122 is projected to form a second projection 132 with an area of ​​S2, 0≤S2 / S1≤10; and / or,

[0066] On a second projection plane 140 parallel to the axis of the hub 110 , the blade 121 is projected to form a third projection 141 with an area of ​​S3 , and the hollow area 122 is projected to form a fourth projection 142 with an area of ​​S4 , where 0≤S4 / S3≤10.

[0067] Specifically, the fan blade 100 includes a hub 110 and N blades 121 arranged on the outer periphery of the hub 110, where N is an integer greater than or equal to 1. The number of blades 121 can be set according to actual needs, and is generally set to at least two, for example, it can be two, three, five or more; in one embodiment, 2≤N≤9, which can both ensure the work of the fan blade 100 and reduce the noise generated during the operation of the fan blade 100. In one embodiment, 4≤N≤7. The inner end (root) of the blade 121 is connected to the hub 110. There are many ways to connect the blades. For example, the blade 121 and the hub 110 can be integrally formed, or they can be assembled together by screws, snaps, or other assembly structures, which are not specifically limited here. It should be noted that the inner end of the blade 121 refers to its end close to the hub 110, and the outer end refers to its end away from the hub 110. That is, the inner end of the blade 121 corresponds to its root position, and the outer end of the blade 121 corresponds to its tip position.

[0068] It is understandable that part of the noise of the current traditional axial flow fan blades comes from the shedding vortex formed at the trailing edge of the blade when the fan blade rotates. That is, when the fan blade rotates, the airflow will form an airflow vortex at the trailing edge of the blade. The airflow vortex directly detaches from the trailing edge of the blade and produces a large noise, resulting in a large noise when the entire fan blade is running, causing trouble to the user and affecting the user's experience. In this solution, a hollow area 122 is formed on the blade 121. The hollow area 122 has a certain guiding effect on the airflow on the blade 121. When the fan blade 100 rotates, the airflow at the trailing edge of the blade 121 is guided along the suction surface 125 of the blade 121 to the pressure surface 126 of the blade 121 through the hollow area 122. In this way, the airflow vortex at the trailing edge of the blade 100 can be dispersed, and the airflow vortex is prevented from directly detaching from the trailing edge of the blade 121 and generating a large shedding vortex noise, thereby achieving a good noise reduction effect, effectively reducing the noise generated when the fan blade 100 is running, and improving the user experience.

[0069] It can be understood that, referring to Figure 2, the pressure side 126 of the blade 121 is the side of the blade 121 facing the impact of the airflow, and the suction side 125 of the blade 121 refers to the side of the blade 121 facing away from the impact of the airflow. The rotation direction of the fan blade 100 is shown in Figures 1 and 2. The hollow area 122 can not only guide the airflow on the blade 121, but also reduce the weight of the blade 121, thereby reducing the overall weight of the fan blade 100, so that only a smaller driving force is required to drive the fan blade 100 to rotate. In some embodiments, a filter can also be provided in the hollow area 122 to also play a role in filtering and purification.

[0070] 1 to 6, on the first projection plane 130 perpendicular to the axis of the hub 110, the blade 121 is projected to form a first projection 131 with an area of ​​S1, and the hollow area 122 is projected to form a second projection 132 with an area of ​​S2, 0≤S2 / S1≤10. Specifically, that is, the fan blade 100 is projected in the direction of the axis L1 of the hub 110, and the first projection plane 130 is perpendicular to the axis L1 of the hub 110. At this time, the projection profile of the blade 121 formed on the first projection plane 130 is consistent with the size of the outer profile formed by the fan blade 100 itself in the axial direction of the hub 110. S2 / S1 is set to the axial annular center area ratio of the blade 121, that is, the ratio of the axial annular center projection to the projection area of ​​the blade 121. If S2 / S1=0, that is, S2=0, the first projection 131 formed by the blade 121 on the first projection plane 130 is a solid structure, and no annular center is formed inside.

[0071] At the same speed, the noise generated by fans with different axial annular area ratios was tested, and a relationship diagram of the axial annular area ratio of the blade 100 and the noise generated was obtained in Figure 5; the power consumed by fans with different axial annular area ratios was tested, and a relationship diagram of the axial annular area ratio of the blade 100 and the power consumed was obtained in Figure 6. When the axial annular area ratio of the blade 121 is 0≤S2 / S1≤10, that is, the maximum area of ​​S2 does not exceed ten times that of S1, it can be seen from Figures 5 and 6 that at the same speed, the noise generated by the fan is smaller and the power consumed is also lower. At this time, along the circumference of the hub 110, the hollow area 122 can effectively weaken the wake of the part of the blade 121 located on its upstream side and the potential flow effect of the part of the blade 121 located on its downstream side, and reduce the airflow interference effect of the part of the blade 121 located on both sides of the hollow area 122. When the axial annular area ratio S2 / S1 of blade 121 is greater than 10, it can be seen from Figures 5 and 6 that at the same speed, the noise generated by the fan increases significantly, and the power consumed by the fan also increases significantly. At this time, the area S2 of the second projection 132 is too large, making it difficult for the hollow area 122 to form a relatively obvious gap jet in the circumferential direction of the hub 110, resulting in a significant decrease in the air volume generated by blade 121. At this time, if the preset air volume is to be achieved, the rotation speed of fan 100 increases significantly, resulting in an increase in the noise of fan 100, and the airflow vortex at the trailing edge of some blades 121 on the upstream side of hollow area 122 cannot be absorbed by some blades 121 on the downstream side of hollow area 122. The airflow vortex at the trailing edge of some blades 121 on the upstream side of hollow area 122 directly falls off, which is also prone to generate a large noise, resulting in a large noise of fan 100.

[0072] In one embodiment, 0≤S2 / S1≤5, that is, the maximum area of ​​S2 does not exceed five times that of S1, further weakening the wake of the portion of the blades 121 on the upstream side of the hollow area 122 and the potential flow effect of the portion of the blades 121 on the downstream side of the hollow area 122, reducing the wake of the portion of the blades 121 on the upstream side of the hollow area 122 and the airflow interference effect of the portion of the blades 121 on the downstream side of the hollow area 122, thereby further effectively reducing the noise of the fan blade 100.

[0073] In one embodiment, 0≤S2 / S1≤4, that is, the maximum area of ​​S2 does not exceed four times that of S1, thereby further weakening the wake of the partial blades 121 on the upstream side of the hollow area 122 and the potential flow effect of the partial blades 121 on the downstream side of the hollow area 122, reducing the wake of the partial blades 121 on the upstream side of the hollow area 122 and the airflow interference effect of the partial blades 121 on the downstream side of the hollow area 122, thereby further effectively reducing the noise of the fan blade 100.

[0074] It can be understood that the projection shape of the blade 121 is limited by the shape of the blade 121 itself, so the shape and number of the second projections 132 formed by the hollow area 122 formed by the blade 121 on the first projection plane 130 are not limited. Referring to Figure 13, one blade 121 can form one second projection 132, two second projections 132 or three second projections 132.

[0075] With reference to Figures 1 and 7 to 12, on a second projection plane 140 parallel to the axis of the hub 110, the blade 121 is projected to form a third projection 141 with an area of ​​S3, and the hollow area 122 is projected to form a fourth projection 142 with an area of ​​S4, 0≤S4 / S3≤10. Specifically, a second projection plane 140 perpendicular to the fan blade 100 is defined, and the fan blade 100 is projected parallel to the side thereof. At this time, the projection contour formed on the second projection plane 140 is consistent with the size of the outer contour formed by the fan blade 100 itself on the side of the hub 110. S4 / S3 is set to the lateral annular center area ratio of the blade 121, that is, the ratio of the lateral annular center projection to the projection area of ​​the blade 121. If S4 / S3=0, that is, S4=0, the third projection 141 formed by the blade 121 on the second projection plane 140 is a solid structure, and no annular center is formed inside.

[0076] At the same speed, the noise generated by fans with different lateral annular area ratios was tested, and a relationship diagram of the lateral annular area ratio of the blade 100 and the noise generated was obtained in Figure 10; the power consumed by fans with different lateral annular area ratios was tested, and a relationship diagram of the axial annular area ratio of the blade 100 and the power consumed was obtained in Figure 11. When the lateral annular area ratio of the blade 121 is 0≤S4 / S3≤10, that is, the maximum area of ​​S4 does not exceed ten times that of S3, it can be seen from Figures 10 and 11 that at the same speed, the noise generated by the fan is smaller and the power consumed is also lower. At this time, along the axial direction of the hub 110, the hollow area 122 can effectively weaken the wake of the part of the blade 121 located on its upstream side and the potential flow effect of the part of the blade 121 located on its downstream side, and reduce the airflow interference effect of the part of the blade 121 located on both sides of the hollow area 122. When the axial annular area ratio S4 / S3 of blade 121 is greater than 10, as can be seen from Figures 9 and 10, at the same speed, the noise generated by the fan increases significantly, and the power consumed also increases significantly. At this time, the area S2 of the fourth projection 142 is too large, and it is difficult for the hollow area 122 to form a relatively obvious gap jet in the axial direction of the hub 110, resulting in a significant decrease in the air volume generated by blade 121. At this time, if the preset air volume is to be achieved, the rotation speed of the fan 100 must be greatly increased, resulting in an increase in the noise of the fan 100. In addition, the airflow vortex at the trailing edge of the blade 121 on the upstream side of the hollow area 122 cannot be absorbed by the blade 121 on the downstream side of the hollow area 122. The airflow vortex at the trailing edge of the blade 121 on the upstream side of the hollow area 122 directly falls off, which is likely to generate a large noise, resulting in a large noise of the fan 100.

[0077] In one embodiment, 0≤S4 / S3≤4, that is, the maximum area of ​​S4 does not exceed four times that of S3, further weakening the wake of the partial blades 121 on the upstream side of the hollow area 122 and the potential flow effect of the partial blades 121 on the downstream side of the hollow area 122, reducing the wake of the partial blades 121 on the upstream side of the hollow area 122 and the airflow interference effect of the partial blades 121 on the downstream side of the hollow area 122, thereby further effectively reducing the noise of the fan blade 100.

[0078] Therefore, in this solution, by limiting the size of the axial and / or lateral projection of the hollow area 122, and thereby limiting the size of the hollow area 122, the airflow and acoustic performance of the fan blade 100 are adjusted, the noise generated by the fan is reduced, and the fan work is increased, thereby improving the performance of the fan blade 100.

[0079] It should be noted that, when the blade assembly 120 has N blades 121, and some of the N blades 121 have hollow areas 122, area S1 is the area of ​​the first projection 131 of a single blade 121 on the first projection plane 130, area S2 is the area of ​​the second projection 132 of the hollow area 122 on the single blade 121 on the first projection plane 130, and S2 / S1 is the axial annular area ratio of the single blade 121; similarly, area S3 is the sum of the areas of the third projection 141 of the single blade 121 on the second projection plane 140, area S4 is the sum of the areas of the fourth projection 142 of the single hollow area 122 on the second projection plane 140, and S4 / S3 is the lateral annular area ratio of the single blade 121.

[0080] When blade assembly 120 has N blades 121, and each of N blades 121 has a hollow region 122, area S1 is the sum of the areas of the first projections 131 of each blade 121 on the first projection plane 130, and area S2 is the sum of the areas of the second projections 132 of each hollow region 122 on the first projection plane 130. S2 / S1 is the axial annular area ratio of the total blades 121. Area S3 is the sum of the areas of the third projections 141 of each blade 121 on the second projection plane 140, and area S4 is the sum of the areas of the fourth projections 142 of each hollow region 122 on the second projection plane 140. S4 / S3 is the lateral annular area ratio of the total blades 121. In other words, this solution is only used to limit the relationship between the projected areas of blades 121 having hollow regions 122. In the following, the relationship between the projection area of ​​blade 121 and the entire fan blade 100 is discussed. Area S1 is the total area of ​​the first projection 131 , area S2 is the total area of ​​the second projection 132 , area S3 is the total area of ​​the third projection 141 , and area S4 is the total area of ​​the fourth projection 142 .

[0081] Referring again to Figures 1, 3, and 4, in one embodiment, the outer contour of blade 100 has a first diameter D1, hub 110 has a second diameter D2, and the flow area of ​​blade 121 satisfies 0 ≤ (S1 + S2) / (S - S1 - S2) ≤ 0.9. Specifically, the flow area S of blade 121, i.e., the area swept by blade 121 during rotation, is (S1 + S2) / (S - S1 - S2), i.e., the ratio of the projected area formed by N blades 121 and their hollow regions 122 within the flow area to the gap area between blades 121. The wider the circumferential width of the blade 121, and / or the greater the number of circumferentially arranged blades 121, the smaller (S-S1-S2), and the larger the axial projection area ratio of the corresponding fan blade 100. Therefore, 0≤(S1+S2) / (S-S1-S2)≤0.9 is set so that the circumferential width of the blade 121, and / or the circumferential number of the blade 121 arranged cannot be too much, and are within a certain range, thereby ensuring the wind intake effect of the fan blade 100, improving the work of the fan blade 100, reducing the wake vortex, reducing the noise of the fan blade 100, and weakening the wake of the part of the blade 121 located on the upstream side of the hollow area 122 and the potential flow effect of the part of the blade 121 located on the downstream side of the hollow area 122, and reducing the airflow interference effect of the part of the blade 121 located on both sides of the hollow area 122.

[0082] The outer contour of the fan blade 100 has a first diameter D1, the hub 110 has a second diameter D2, the maximum width of the blade 121 in the axial direction of the hub 110 is H, the blade 121 has a reference area S'= (D1-D2)H, and S', S4, and S3 satisfy 0.1≤(S4+S3) / S'≤1.

[0083] Specifically, the reference area S' of blade 121 is assumed to be (D1-D2)H. The ratio of the lateral projected area of ​​blade 100 to the reference area S' is (S4+S3) / S', and is referred to as the lateral projected area ratio of blade 100. At the same speed, the noise generated by fans with different ratios of lateral projected area to reference area were tested, resulting in Figure 11, a graph showing the relationship between the ratio of lateral projected area to reference area and the noise generated. The power consumed by fans with different ratios of lateral projected area to reference area were also tested, resulting in Figure 12, a graph showing the relationship between the ratio of lateral projected area to reference area and the power consumed. When 0.1≤(S4+S3) / S'≤1, as the proportion of the lateral projection area of ​​the fan blade 100 increases, the noise generated by the fan fluctuates slightly, but generally tends to decrease, and the power consumed also tends to decrease, thereby ensuring the air intake effect of the fan blade 100, improving the work done by the fan blade 100, reducing the wake vortex, reducing the noise of the fan blade 100, and weakening the wake of the part of the blade 121 located on the upstream side of the hollow area 122 and the potential flow effect of the part of the blade 121 located on the downstream side of the hollow area 122, and reducing the airflow interference effect of the part of the blade 121 located on both sides of the hollow area 122.

[0084] To set 0.1≤(S4+S3) / S'≤1, the installation of the blade 121 on the hub 110 can be adjusted, such as the distance between the part of the blade 121 located on the upstream side of the hollow area 122 and the part of the blade 121 located on the downstream side of the hollow area 122, the degree of inclination of the blade 121 relative to the axial direction of the hub 110, the degree of curvature of the blade 121, etc., so that the proportion of the lateral projection area of ​​the blade 121 is within a certain range.

[0085] In one embodiment, 0.4 ≤ (S4 + S3) / S' ≤ 1, thereby further improving the air intake efficiency of fan blade 100, increasing the work of fan blade 100, reducing wake vortices, and reducing noise from fan blade 100. It also weakens the wake of the portion of blades 121 located upstream of hollow region 122 and the potential flow effect of the portion of blades 121 located downstream of hollow region 122, and reduces the airflow interference effect of the portions of blades 121 located on both sides of hollow region 122. In one embodiment, 0.6 ≤ (S4 + S3) / S' ≤ 1.

[0086] The outer contour of the fan blade 100 has a first diameter D1, and the maximum width of the blade 121 in the axial direction of the hub 110 is H, and satisfies 0.02≤H / D1≤1. Specifically, H and D1 together limit the installation size of the blade 121 on the hub 110, and thus limit the ratio of the maximum height and width of the blade 121. The operator can adjust the fan blade 100 to a position where the noise is lower and the work done by the fan blade 100 is greater by selecting a blade 121 of appropriate size, adjusting the distance between the blades 121 on both sides of the hollow area 122, and / or the degree of inclination of the blades 121 on both sides of the hollow area 122 relative to the axial direction of the hub 110, thereby further reducing the noise of the fan blade 100 and improving the work capacity of the fan blade 100.

[0087] In one embodiment, 0.05≤H / D1≤0.2, which further limits the ratio of the maximum height to the width of the blade 121, thereby further reducing the noise of the fan blade 100 and improving the work performance of the fan blade 100.

[0088] In one embodiment, at least one blade 121 includes a first segment 123 and a second segment 124 , and at least portions of the first segment 123 and the second segment 124 are spaced apart in the circumferential and / or axial direction of the hub 110 ;

[0089] The first segment 123 and the second segment 124 enclose a hollow area 122 .

[0090] Specifically, in the air intake direction of the fan blade 100, the first segment 123 is located upstream of the second segment 124, and at least part of the first segment 123 and the second segment 124 are spaced apart in the circumferential and / or axial directions of the hub 110, that is, the first segment 123 and the second segment 124 are staggered in the hub 110, that is, at least part of the first segment 123 and the second segment 124 can be spaced apart only in the axial direction of the hub 110, or can be spaced apart only in the circumferential direction of the hub 110; or at least part of the first segment 123 and the second segment 124 are spaced apart in both the axial and circumferential directions of the hub 110.

[0091] The first segment 123 and the second segment 124 enclose a hollow region 122, forming an annular structure for the blade 121. The hollow region 122 serves as the center of the annular structure. The blade 121 is divided into regions, where the first segment 123 and the second segment 124 are the portions of the blade 121 located on opposite sides of the hollow region 122. Specifically, the first segment 123 occupies approximately half of the outline of the hollow region 122 formed by the blade 121, while the second segment 124 occupies approximately the other half. However, it should be noted that the size and shape of the first segment 123 and the second segment 124 are not necessarily identical. As shown in Figure 15, the first segment 123 forms the main body of the blade 121, while the second segment 124 curves and meanders toward the downstream direction of the airflow at the end of the first segment 123 away from the hub 110, together forming the hollow region 122. As shown in Figure 16, the first segment 123 and the second segment 124 partially merge at the inner end, while the remaining portions are roughly symmetrically arranged along the hollow region 122.

[0092] When the contour boundary of the hollow area 122 is jointly enclosed by the hub 110 and the blades 121, referring to Figures 1, 2 and 14, the first segment 123 and the second segment 124 are spaced apart in the circumferential and / or axial direction of the hub 110, and the two are independent of each other at the inner ends (not fused); when the contour of the hollow area 122 is completely enclosed by the blades 121, referring to Figures 15 and 16, the inner ends of the first segment 123 and the second segment 124 are fused, and only the parts located in the hollow area 122 are spaced apart in the circumferential and / or axial direction of the hub 110.

[0093] The annular structure enclosed by the first segment 123 and the second segment 124 can be either a closed annular structure or a non-closed annular structure. It should be noted that the so-called closed annular structure refers to the closed connection between the first segment 123 and the second segment 124, such that the periphery of the hollow region 122 is continuously connected without any gaps. For example, in one embodiment, referring to Figures 1, 2, and 15, the blade 121 further includes a bridging segment 127 (the bridging segment 127 is the portion of the blade 121 that is substantially parallel to the circumference of the hollow region 122 and the hub 110, i.e., the portion located at the tip of the blade 121). The bridging segment 127 connects the outer end of the first segment 123 and the outer end of the second segment 124. The first segment 123, the bridging segment 127, and the second segment 124 form an arc connection, and together enclose the hollow region 122. That is, the outer end of the first segment 123 and the outer end of the second segment 124 are connected by a curved transition of the bridging segment 127, so that the first segment 123 and the second segment 124 are smoothly transitioned to reduce the wingtip vortex at the top of the blade 121, thereby reducing the noise of the fan blade 100, and on the other hand, it can also improve the working capacity of the fan blade 100.

[0094] A non-closed ring means that the first segment 123 and the second segment 124 are at least partially not closed and connected, and some positions around the hollow area 122 are discontinuous. For example, in one embodiment, referring to Figure 14, the first segment 123 and the second segment 124 are disconnected at one end of the top of the blade 121, but the blade 121 as a whole still presents a ring shape with a hollow area 122.

[0095] There are various specific configurations for hollow region 122. In one embodiment, referring to Figures 1, 2, and 14, the inner ends of first segment 123 and second segment 124 are respectively connected to hub 110. This means that blade 121 is now divided into two spaced-apart lobes on hub 110. The first segment 123, second segment 124, and hub 110 together form an annular structure. This increases the effective length of first segment 123 and second segment 124, thereby improving the overall performance of blade 121.

[0096] In another embodiment, referring to Figures 15 and 16 , the hollow region 122 can also be directly defined on the blade 121, positioned near the outer end of the blade 121. For example, in another embodiment, referring to Figure 15 , the inner end of the first segment 123 is connected to the side edge of the second segment 124, and the inner end of the second segment 124 is connected to the hub 110. In other words, the inner end of the second segment 124 serves as the root of the blade 121 and is directly connected to the hub 110, while the first segment 123 is not directly connected to the hub 110. The end of the blade 121 away from the hub 110 curves downstream to form the hollow region 122. This allows the root of the blade 121 to be more compact, which helps reduce the weight of the blade 121.

[0097] In yet another embodiment, referring to Figure 16 , the inner end of the first segment 123 and the inner end of the second segment 124 are connected and also connected to the hub 110. That is, the root portion of the blade 121 is formed by both the first segment 123 and the second segment 124, and the hollow region 122 is directly formed in the blade 121. This improves the structural strength of the root portion of the blade 121.

[0098] In the direction of rotation of blade 100, first segment 123 is located upstream of second segment 124. When blade 100 rotates, the majority of the airflow is directly blown out in a forward direction from pressure surfaces 126 of first segment 123 and second segment 124. Simultaneously, the airflow vortex on suction surface 125 of first segment 123 flows to pressure surface 126 of second segment 124. This allows the airflow vortex at the trailing edge of first segment 123 to be absorbed by second segment 124, reducing the noise generated by the airflow vortex directly falling off the trailing edge of first segment 123. This effectively reduces the noise of blade 100.

[0099] In one embodiment, blade 121 further includes a bridging segment 127, which connects the outer end of first segment 123 and the outer end of second segment 124. The first segment 123, bridging segment 127, and second segment 124 form a smooth transition, and together with hub 110, define a hollow region 122. The smooth transition between first segment 123, second segment 124, and bridging segment 127 creates a smooth fan-shaped structure, reducing resistance to airflow along hollow region 122, thereby further reducing noise. In one embodiment, first segment 123, second segment 124, and bridging segment 127 are integrally formed, which increases overall structural strength and stability of blade 121 while simplifying the manufacturing process.

[0100] The present application 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 fan blades 100, and the driving member can specifically be a drive motor.

[0101] The present application also proposes a blowing device, including a fan blade 100 or a blower. The specific structure of the fan blade 100 or the blower refers to the above-mentioned embodiment. Since the present blowing device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described one by one 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 fan blades 100 (such as air conditioner outdoor units). By adopting the above-mentioned fan blades 100 or blowers, the noise of the blowing device can be effectively reduced and the user experience can be improved.

[0102] The above are merely optional embodiments of the present application and do not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A fan blade, wherein, The fan blade includes: a hub; and a blade assembly including N blades, where N is an integer greater than or equal to 1; the blades are connected to the hub, and at least one of the blades is provided with a hollow area; On a first projection plane perpendicular to the axis of the hub, the orthographic projection of the blade forms a first projection with an area of S1, and the orthographic projection of the hollow area forms a second projection with an area of S2, where 0 ≤ S2 / S1 ≤ 10; and / or, On a second projection plane parallel to the axis of the hub, the orthographic projection of the blade forms a third projection with an area of S3, and the orthographic projection of the hollow area forms a fourth projection with an area of S4, where 0 ≤ S4 / S3 ≤ 10.

2. The fan blade according to claim 1, wherein, The hollow areas are provided on all of the N blades of the blade assembly. The area S1 is the total area of the first projections of the respective blades on the first projection plane, and the area S2 is the total area of the second projections of the respective hollow areas on the first projection plane; The area S3 is the total area of the third projections of the respective blades on the second projection plane, and the area S4 is the total area of the fourth projections of the respective hollow areas on the second projection plane.

3. The fan blade according to claim 2, wherein, 0 ≤ S2 / S1 ≤ 5.

4. The fan blade according to claim 3, wherein, 0 ≤ S2 / S1 ≤ 4.

5. The fan blade according to claim 2, wherein, 0 ≤ S4 / S3 ≤ 4.

6. The fan blade according to claim 2, wherein The outer contour of the fan blade has a first diameter D1, the hub has a second diameter D2, and the blade flow area is; and it satisfies 0 < (S1 + S2) / (S - S1 - S2) ≤ 0.

9.

7. The fan blade according to claim 2, wherein, The outer contour of the fan blade has a first diameter D1, the hub has a second diameter D2, the maximum width of the blade in the axial direction of the hub is H, the blade has a reference area S' = (D1 - D2)H, and S', S4, and S3 satisfy 0.1 ≤ (S4 + S3) / S' ≤ 1.

8. The fan blade according to claim 7, wherein, 0.4 ≤ (S4 + S3) / S' ≤ 1.

9. The fan blade according to claim 8, wherein, 0.6 ≤ (S4 + S3) / S' ≤ 1.

10. The fan blade according to claim 1, wherein, The outer contour of the fan blade has a first diameter D1, the maximum width of the blade in the axial direction of the hub is H, and it satisfies 0.02 ≤ H / D1 ≤ 1.

11. The fan blade according to claim 9, wherein, 0.02 ≤ H / D1 ≤ 0.

5.

12. The fan blade according to any one of claims 1 to 11, wherein, 2≤N≤9。 13. The fan blade according to claim 12, wherein, 4≤N≤7。 14. The fan blade according to any one of claims 1 to 11, wherein, At least one of the blades includes a first segment and a second segment, and at least part of the first segment and the second segment are spaced apart in the circumferential and / or axial direction of the hub; The first segment and the second segment enclose to form the hollow area.

15. The fan blade according to claim 14, wherein, The blade further includes a bridging segment that connects the outer ends of the first segment and the second segment. A radian connection is formed between the first segment, the bridging segment, and the second segment, and the first segment, the second segment, the bridging segment, and the hub jointly enclose to form the hollow area.

16. The fan blade according to claim 14, wherein, The inner ends of the first segment and the second segment are respectively connected to the hub; Alternatively, the inner end of the first segment is connected to the side edge of the second segment, and the inner end of the second segment is connected to the hub; Alternatively, the inner ends of the first segment and the second segment are connected to each other and are simultaneously connected to the hub.

17. The fan blade according to claim 14, wherein, In the intake direction of the fan blade, the first segment is arranged upstream.

18. The fan blade according to any one of claims 1 to 11, wherein, The hollow area is provided with a filter screen.

19. A blower, wherein, The blower includes the fan blade as described in any one of claims 1 to 18, and a driving member connected to the fan blade, the driving member being configured to drive the fan blade to rotate.

20. A blowing device, wherein, The blowing device includes the fan blade as described in any one of claims 1 to 18 or the blower as described in claim 19.

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