Fan leaves, ceiling fans and fan lamps

Abstract

The disclosure provides a fan blade, a ceiling fan and a fan lamp, and belongs to the technical field of household appliances. The fan blade is applied to a ceiling fan, and the fan blade comprises a leading edge, a front edge, a trailing edge and a back edge. The fan blade is connected to a fan disc through the leading edge, the front edge is a windward edge of the fan blade, the back edge is a leeward edge of the fan blade, and the trailing edge is an edge of one end of the fan blade away from the fan disc. The front edge comprises a convex part, the convex part protrudes in a direction away from the back edge, and the height of the front edge is the highest at the convex part. The windward area of the front edge at the convex part is large, so that the fan blade has a large air output. The end point of one end of the trailing edge is a first end point, and the first end point is in a depressed state. The windward area of the fan blade at the trailing edge is small, which is beneficial to reducing the noise generated by the trailing edge. In this way, the fan blade can provide a large air output without generating large noise.

Description

Technical Field

[0001] This disclosure relates to the field of household appliance technology, and in particular to a fan blade, a ceiling fan, and a fan light. Background Technology

[0002] Ceiling fans are a common household appliance used to blow air into a room. The fan blades are the core component of the fan, and their specific shape and structure can affect the airflow and noise level.

[0003] The fans in the relevant technologies have relatively low airflow and high noise levels. Therefore, how to improve the fan blade structure to increase airflow and reduce noise is a key problem that needs to be solved. Summary of the Invention

[0004] This disclosure provides a fan blade, a ceiling fan, and a fan light, which can solve the technical problems existing in the related art. The technical solutions of the fan blade, the ceiling fan, and the fan light are as follows.

[0005] In a first aspect, this disclosure provides a fan blade, the fan blade including a leading edge, a trailing edge, a trailing edge and a rear edge, the leading edge being the edge of one end of the fan blade connected to the fan blade disk, the trailing edge being the windward edge of the fan blade, the trailing edge being the leeward edge of the fan blade, and the trailing edge being the edge of the end of the fan blade away from the fan blade disk;

[0006] The leading edge includes a protrusion that protrudes in a direction away from the trailing edge, and the leading edge is at its highest point in the protrusion.

[0007] The endpoint where the trailing edge connects to the leading edge is the first endpoint, and the first endpoint is in a downward-pressed shape.

[0008] In one possible implementation, the endpoint where the trailing edge connects to one end of the trailing edge is the second endpoint. On the projection of the fan blade onto the reference plane, the tangent line of the trailing edge at the second endpoint is the first tangent line, and the tangent line of the trailing edge at the first endpoint is the second tangent line.

[0009] The first endpoint is located below the first tangent, and / or the angle between the first tangent and the horizontal plane is greater than the angle between the second tangent and the horizontal plane;

[0010] The reference plane is a plane parallel to the central axis of the ceiling fan and passing through the first endpoint and the second endpoint.

[0011] In one possible implementation, on the projection pattern of the fan blade onto the reference plane, the trailing edge has a first arcuate segment, the first arcuate segment connecting to the second endpoint, and the concave surface of the first arcuate segment facing downwards.

[0012] In one possible implementation, the height of the leading edge gradually increases along the direction from the leading edge to the protrusion;

[0013] The height of the leading edge gradually decreases along the direction from the protrusion to the trailing edge.

[0014] In one possible implementation, the fan blades can be expanded or retracted relative to the fan blade disk, and when the fan blades are retracted relative to the fan blade disk, on the projection pattern of the ceiling fan along the central axis of the ceiling fan, if the straight line intersects the projection point of the central axis, the first point of the leading edge, and the second point of the trailing edge, then the distance between the first point and the second point is the width of the fan blade at the first point.

[0015] The fan blade has the largest width at the protrusion.

[0016] In one possible implementation, the width of the fan blade gradually increases along the direction from the leading edge to the protrusion;

[0017] The width of the fan blade gradually decreases along the direction from the protrusion to the trailing edge.

[0018] In one possible implementation, let the width of the fan blade at the protrusion be W1;

[0019] On the projection of the ceiling fan along its central axis, let the distance between the second endpoint and the first endpoint of the trailing edge be W2, then W2 ≤ 0.5W1, where the second endpoint is the intersection of the trailing edge and the rear edge.

[0020] In one possible implementation, let the diameter of the fan blade disk be D, and the width of the fan blade at the protrusion be W1, then 0.15D≤W1≤0.3D.

[0021] In one possible implementation, the leading edge further includes a second arcuate segment located between the convex portion and the trailing edge, the second arcuate segment being concave in a direction close to the trailing edge.

[0022] In one possible implementation, the leading edge further includes a third arcuate segment located between the protrusion and the leading edge, the third arcuate segment being concave in the direction close to the trailing edge;

[0023] The protrusion is formed at the intersection of the second arc segment and the third arc segment.

[0024] The second arc segment has a first concave point, wherein the line connecting the convex part and the first end point is the first connecting line, and the first concave point is the point on the second arc segment that is farthest from the first connecting line;

[0025] The fan blade is used to rotatably connect with the fan blade disk, and the fan blade can retract or expand relative to the fan blade disk around the rotation axis. On the projection pattern of the fan blade along the rotation axis, the intersection of the trailing edge and the tail edge is set as the second endpoint, the line connecting the projection point of the rotation axis and the second endpoint is set as the second connecting line, and the intersection of the reference line passing through the first concave point and perpendicular to the second connecting line with the second connecting line is set as the first projection point.

[0026] Let L1 be the distance between the second endpoint and the projection point of the rotation axis, and L2 be the distance between the first projection point and the projection point of the rotation axis. Then 0.7L1≤L2≤0.8L1.

[0027] In one possible implementation, the third arc segment has a second concave point, wherein the first edge intersects the third arc segment at a fourth endpoint, the line connecting the convex portion and the fourth endpoint is a third connecting line, and the second concave point is the point on the third arc segment farthest from the third connecting line;

[0028] The fan blade is used to rotatably connect with the fan blade disk, and the fan blade can retract or expand relative to the fan blade disk around the rotation axis. On the projection pattern of the fan blade along the rotation axis, the intersection of the trailing edge and the tail edge is set as the second endpoint, the line connecting the projection point of the rotation axis and the second endpoint is set as the second connecting line, and the intersection of the reference line passing through the second concave point and perpendicular to the second connecting line with the second connecting line is set as the second projection point.

[0029] Let L1 be the distance between the second endpoint and the projection point of the rotation axis, and L3 be the distance between the second projection point and the projection point of the rotation axis. Then 0.2L1≤L3≤0.3L1.

[0030] In one possible implementation, the fan blades are rotatably connected to the fan blade disk, and the fan blades are capable of retracting or unfolding relative to the fan blade disk about a rotation axis.

[0031] On the projection pattern of the fan blade along the rotation axis, the intersection of the trailing edge and the tail edge is set as the second endpoint, the line connecting the projection point of the rotation axis and the second endpoint is set as the second connecting line, and the intersection of the reference line passing through the protrusion and perpendicular to the second connecting line with the second connecting line is set as the third projection point.

[0032] Let L1 be the distance between the second endpoint and the projection point of the rotation axis, and L4 be the distance between the third projection point and the projection point of the rotation axis. Then 0.5L1≤L4≤0.75L1.

[0033] In one possible implementation, let the angle between the line connecting the first endpoint and the second endpoint of the trailing edge and the horizontal plane be α, then 0°≤α≤15°, where the second endpoint is the intersection of the trailing edge and the trailing edge.

[0034] In one possible implementation, the fan blades can be extended or retracted relative to the fan blade disk, and when the fan blades are retracted relative to the fan blade disk, on the projection pattern of the ceiling fan along the central axis of the ceiling fan, the intersection of the line connecting the projection point of the central axis and the protrusion with the trailing edge is set as the fourth projection point.

[0035] The angle between the line connecting the fourth projection point and the convex part and the horizontal plane is γ, then 15°≤γ≤40°.

[0036] In one possible implementation, let the trailing edge and the leading edge intersect at the third endpoint, the intersection of the trailing edge and the trailing edge be the second endpoint, and the angle between the line connecting the second endpoint and the third endpoint and the horizontal plane be β, then 5°≤β≤15°.

[0037] In a second aspect, this disclosure also provides a ceiling fan, the ceiling fan including a hanging rod, a fan blade disk and a plurality of fan blades as described in any of the first aspects;

[0038] One end of the suspension rod is fixed to the ceiling, and the other end is connected to the fan blade disk;

[0039] One end of each of the fan blades is connected to the fan blade disk.

[0040] Thirdly, this disclosure also provides a fan light, the fan light including a lamp assembly and a ceiling fan as described in any of the second aspects;

[0041] The lamp assembly is fixed to the bottom of the fan blade disk.

[0042] The technical solution provided in this disclosure includes at least the following beneficial effects:

[0043] This disclosure provides a fan blade with a convex leading edge, which increases the frontal area of ​​the leading edge at the convex part, thereby enabling the fan blade to have a larger airflow. Aerodynamics shows that the wind speed is highest near the trailing edge of the fan blade, making it most prone to noise generation. Therefore, by aligning the first end point downwards, the frontal area of ​​the fan blade at the trailing edge is reduced, which helps to decrease the noise generated at the trailing edge.

[0044] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings:

[0046] Figure 1 This is a schematic diagram of the structure of a ceiling fan in the unfolded state, as shown in an embodiment of this disclosure;

[0047] Figure 2 This is a schematic diagram of the structure of a ceiling fan in the retracted state, as shown in an embodiment of this disclosure;

[0048] Figure 3 This is a schematic diagram of the structure of a fan blade shown in an embodiment of this disclosure;

[0049] Figure 4 This is a projected view of a fan blade shown in an embodiment of this disclosure;

[0050] Figure 5 This is a projected view of a ceiling fan shown in an embodiment of this disclosure;

[0051] Figure 6 This is a projected view of a fan blade shown in an embodiment of this disclosure;

[0052] Figure 7 This is a projected view of a fan blade shown in an embodiment of this disclosure;

[0053] Figure 8 This is a projected view of a fan blade shown in an embodiment of this disclosure;

[0054] Figure 9 This is a projected view of a fan blade shown in an embodiment of this disclosure;

[0055] Figure 10 This is a diagram showing the relationship between the power of a ceiling fan and L4 / L1 according to an embodiment of this disclosure;

[0056] Figure 11 This is a graph showing the relationship between the maximum wind speed of a ceiling fan and L4 / L1, as illustrated in an embodiment of this disclosure.

[0057] Figure 12 This is a diagram illustrating the relationship between the noise of a ceiling fan and the L4 / L1 ratio, as shown in an embodiment of this disclosure.

[0058] Figure 13 This is a schematic diagram of the structure of a fan blade shown in an embodiment of this disclosure;

[0059] Figure 14 This is a graph showing the relationship between the power of a ceiling fan and α, as illustrated in an embodiment of this disclosure.

[0060] Figure 15 This is a graph showing the relationship between the maximum wind speed of a ceiling fan and α, as illustrated in an embodiment of this disclosure.

[0061] Figure 16 This is a graph showing the relationship between the noise of a ceiling fan and α, as illustrated in an embodiment of this disclosure;

[0062] Figure 17 This is a graph showing the relationship between the power of a ceiling fan and γ-α when α = 5°, according to an embodiment of this disclosure.

[0063] Figure 18 This is a graph showing the relationship between the maximum wind speed and γ-α of a ceiling fan when α = 5°, as illustrated in an embodiment of this disclosure.

[0064] Figure 19 This is a graph showing the relationship between noise and γ-α for a ceiling fan at α = 5°, as illustrated in an embodiment of this disclosure.

[0065] Figure 20 This is a graph showing the relationship between the power of a ceiling fan and γ-α when α = 15°, according to an embodiment of this disclosure.

[0066] Figure 21 This is a graph showing the relationship between the maximum wind speed and γ-α of a ceiling fan when α = 15°, as illustrated in an embodiment of this disclosure.

[0067] Figure 22 This is a graph showing the relationship between noise and γ-α for a ceiling fan at α = 15°, as illustrated in an embodiment of this disclosure.

[0068] Figure 23 This is a schematic diagram of the structure of a fan blade shown in an embodiment of this disclosure;

[0069] Figure 24 This is a schematic diagram of the structure of a fan light shown in an embodiment of this disclosure.

[0070] Legend:

[0071] 100. Fan blade; 101. First edge; 102. Leading edge; 102a. Second arc segment; 102b. Third arc segment; 103. Trailing edge; 1031. First arc segment; 104. Trailing edge.

[0072] 200. Hanging rod;

[0073] 300. Fan blade disc;

[0074] A, convex part; C, third endpoint; E, fourth projection point; K, fourth endpoint; M, second endpoint; N, first endpoint; O, rotation axis; P, central axis; Q, third projection point; S1, reference plane; S2, horizontal plane; XI, first concave point; X2, first projection point; Y1, second concave point; Y2, second projection point.

[0075] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0077] The terminology used in the embodiments of this disclosure is for illustrative purposes only and is not intended to limit the disclosure. Unless otherwise defined, the technical or scientific terms used herein should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “a” or “one,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0078] Ceiling fans are a common household appliance used to blow air into a room. For example... Figure 1 As shown, the fan blade 100 is the core component of the fan, and the specific shape and structure of the fan blade 100 can affect the air volume and noise of the fan.

[0079] In ceiling fans, when the fan is not in operation, the fan blades 100 rotate around the rotation axis O along the direction close to the central axis P of the fan, resulting in the fan blades 100 eventually being in a folded state. To avoid interference between adjacent fan blades 100 in the folded state, the length and width of the fan blades 100 are usually set relatively small, resulting in a smaller airflow and higher noise levels in the ceiling fan. Therefore, how to improve the airflow and reduce noise of the ceiling fan by improving the structure of the fan blades 100 is a key problem that needs to be solved.

[0080] This disclosure provides a fan blade, such as... Figures 1-4 As shown, the fan blade 100 is used in a ceiling fan. The fan blade 100 includes a leading edge 101, a trailing edge 102, a trailing edge 103, and a trailing edge 104. The leading edge 101 is the edge of the fan blade 100 that connects to the fan blade disk 300. The trailing edge 102 is the windward edge of the fan blade 100. The trailing edge 104 is the leeward edge of the fan blade 100. The trailing edge 103 is the edge of the fan blade 100 that is away from the fan blade disk 300. The leading edge 102 includes a protrusion A, which protrudes away from the trailing edge 104, and the height of the leading edge 102 is highest at protrusion A. The endpoint of the trailing edge 103 that connects to the end of the leading edge 102 is a first endpoint N, which is in a downward-pressed shape.

[0081] When the fan rotates, the leading edge 102 of the fan blade 100 initially drives the airflow. It can be understood that when the fan blade 100 is working, the air-facing surface of the fan blade 100 forms an angle with the horizontal plane, thereby driving the airflow. The trailing edge 104 may protrude in a direction away from the leading edge 102. The protrusion A can be the area near the protrusion point of the leading edge 102.

[0082] The trailing edge 103 may be arc-shaped, and the curvature of the trailing edge 103 is different from that of the leading edge 102 and the trailing edge 104. There is an abrupt change between the trailing edge 103 and the leading edge 102, and the tangent of the trailing edge 103 at the first endpoint N forms an angle with the tangent of the leading edge 102 at the first endpoint N.

[0083] The technical solution provided in this embodiment has a protrusion A on the leading edge 102, which allows for a larger windward area at the protrusion A, thereby enabling the fan blade 100 to have a larger airflow. Aerodynamics shows that the wind speed is highest near the trailing edge 103 of the fan blade 100, where noise is most likely to be generated. Therefore, setting the first endpoint N to a downward-pressed configuration reduces the windward area at the trailing edge 103, which helps to reduce the noise generated at the trailing edge 103.

[0084] In some examples, such as Figure 3 and Figure 4As shown, the endpoint of the trailing edge 103 connecting to the trailing edge 104 is the second endpoint M. On the projection of the fan blade 100 onto the reference plane S1, let the tangent of the trailing edge 103 at the second endpoint M be the first tangent z1, and the tangent of the trailing edge 103 at the first endpoint N be the second tangent z2.

[0085] The first endpoint N is located below the first tangent z1, and / or the angle between the first tangent z1 and the horizontal plane S2 is greater than the angle between the second tangent z2 and the horizontal plane S2.

[0086] The reference plane S1 is a plane parallel to the central axis P of the ceiling fan and passing through the first endpoint N and the second endpoint M. The tangent of the trailing edge 103 at the second endpoint M forms an angle with the tangent of the trailing edge 104 at the second endpoint M. The central axis P is the axis of the ceiling fan's suspension rod.

[0087] In some examples, such as Figure 3 and Figure 4 As shown, on the projection pattern of the fan blade 100 on the reference plane S1, the trailing edge 103 has a first arc segment 1031, the first arc segment 1031 is connected to the second endpoint M, and the concave surface of the first arc segment 1031 faces downward.

[0088] The portion of the trailing edge 103 near the first endpoint N can be straight, or it can be arc-shaped with the convex side facing downwards.

[0089] In some examples, such as Figure 3 and Figure 4 As shown, the height of the leading edge 102 gradually increases along the direction from the leading edge 101 to the protrusion A. The height of the leading edge 102 gradually decreases along the direction from the protrusion A to the trailing edge 103. Thus, the windward area of ​​the fan blade 100 gradually increases along the direction from the leading edge 101 to the protrusion A. Conversely, the windward area of ​​the fan blade 100 gradually decreases along the direction from the protrusion A to the trailing edge 103. This results in both the portion of the fan blade 100 near the leading edge 101 and the portion near the trailing edge 103 having relatively small windward areas.

[0090] The linear velocity of the fan blade 100 near its leading edge 101 is relatively low, resulting in lower airflow efficiency. Therefore, the height of the fan blade 100 near its leading edge 101 can be set to be relatively small, which will not reduce the airflow volume of the fan blade while also keeping the weight of the fan blade 100 low. The airflow velocity at the trailing edge 103 is relatively high, so setting the width of the portion of the fan blade 100 near the trailing edge 103 to be relatively small will reduce the noise of the fan blade 100.

[0091] In some examples, such as Figure 5 and Figure 6As shown, the fan blade 100 is used in a ceiling fan. The fan blade 100 can be extended or retracted relative to the fan blade disk 300. When the fan blade 100 is retracted relative to the fan blade disk 300, on the projection diagram of the ceiling fan along the central axis P, let the straight line g intersect the projection point of the central axis P, the first point of the leading edge 102, and the second point of the trailing edge 104. Then the distance between the first point and the second point is the width of the fan blade at the first point. The width of the fan blade is the largest at the protrusion A. This results in a larger windward area in the middle region of the fan blade 100, thereby generating a larger air volume. Furthermore, it allows the windward area near the trailing edge 103 of the fan blade to be smaller, avoiding excessive airflow and resulting in excessive noise.

[0092] When the trailing edge 104 is an arc, the width of the fan blade 100 on the projection of the ceiling fan along the central axis P can also refer to the length of the part of the line connecting the center of the trailing edge 104 and any point on the trailing edge 104 that coincides with the length of the fan blade 100.

[0093] In some examples, such as Figure 5 and Figure 6 As shown, the width of the fan blade 100 gradually increases along the direction from the leading edge 101 to the protrusion A. The width of the fan blade 100 gradually decreases along the direction from the protrusion A to the trailing edge 103. Thus, along the direction away from the leading edge 101, the windward area of ​​the fan blade 100 first gradually increases and then gradually decreases. The linear velocity of the fan blade 100 near the leading edge 101 is relatively low, resulting in lower airflow efficiency. Therefore, the width of the fan blade 100 near the leading edge 101 can be set to be smaller, which neither reduces the airflow nor lowers the weight of the fan blade 100. This results in a smaller windward area near the trailing edge 103, preventing excessive airflow and resulting in greater noise.

[0094] In some examples, such as Figure 5 As shown, let the width of the fan blade 100 at the protrusion A be W1. On the projection of the ceiling fan along its central axis P, let the distance between the second endpoint M and the first endpoint N of the trailing edge 103 be W2. Then W2 ≤ 0.5W1, where the second endpoint M is the intersection of the trailing edge 103 and the trailing edge 104. W2 can also be the width of the fan blade 100 at the second endpoint M.

[0095] This allows the fan blade 100 to have a smaller width at the trailing edge 103, resulting in a smaller frontal area at the trailing edge 103 and making it less likely for the fan blade 100 to generate significant noise.

[0096] In some examples, such as Figure 6As shown, let the diameter of the fan blade disk 300 be D, and the width of the fan blade 100 at the protrusion A be W1. Then, 0.15D ≤ W1 ≤ 0.3D. This ensures that the fan blade 100 maintains a distance from the suspension rod 200 when it is closed, preventing collisions between the fan blade 100 and the suspension rod 200. If W1 is too small, the width of the fan blade 100 at the protrusion A will be too small, resulting in a small frontal area for the fan blade 100 at the protrusion A, which is not conducive to the fan blade 100 generating a large air volume.

[0097] In some examples, such as Figure 5 As shown, the leading edge 102 also includes a second arcuate segment 102a, which is located between the protrusion A and the trailing edge 103. The second arcuate segment 102a is concave along the direction close to the trailing edge 104. This allows the fan blade 100 to have a smaller width at the second arcuate segment 102a, thereby reducing the frontal area of ​​the fan blade 100 at the second arcuate segment 102a. Because the second arcuate segment 102a is close to the trailing edge 103, the fan blade 100 is less likely to generate significant noise.

[0098] In some examples, such as Figure 5 As shown, the leading edge 102 also includes a third arcuate segment 102b, which is located between the convex portion A and the leading edge 101. The third arcuate segment 102b is concave in the direction close to the trailing edge 104, wherein the convex portion A is formed at the intersection of the second arcuate segment 102a and the third arcuate segment 102b.

[0099] The linear velocity of the fan blade 100 near the first edge 101 is relatively low, resulting in lower airflow efficiency. Therefore, setting the third arc segment 102b to be concave not only does not reduce the airflow of the fan blade but also reduces the weight of the fan blade 100.

[0100] In some examples, such as Figure 7 As shown, the second arc-shaped segment 102a has a first concave point X1. Let the line connecting the convex portion A and the first endpoint N be the first connecting line AN, and let the first concave point X1 be the point on the second arc-shaped segment 102a farthest from the first connecting line AN. The fan blade 100 is used for rotatable connection with the fan blade disk 300, and the fan blade 100 can retract or expand relative to the fan blade disk 300 around the rotation axis O. Figure 8 As shown, on the projection of the fan blade 100 along the rotation axis O, let the intersection of the trailing edge 104 and the tail edge 103 be the second endpoint M, and the line connecting the projection point of the rotation axis O and the second endpoint M be the second connecting line OM. Let the reference line passing through the first concave point X1 and perpendicular to the second connecting line OM intersect with the second connecting line OM at the first projection point X2. Let the distance between the second endpoint M and the projection point of the rotation axis O be L1, and the distance between the first projection point X2 and the projection point of the rotation axis O be L2, then 0.7L1≤L2≤0.8L1.

[0101] If L2 is too small, the first concave point X1 will be too close to the convex part A, resulting in a smaller width at the convex part A, which is not conducive to increasing the windward area of ​​the fan blade 100 at the convex part A. If L2 is too large, the first concave point X1 will be too close to the trailing edge 103, resulting in a larger width of the fan blade 100 at the second arc segment 102a, which is not conducive to reducing the noise of the fan blade 100.

[0102] In some examples, such as Figure 7 As shown, the third arc-shaped segment 102b has a second concave point Y1. The first edge 101 intersects the third arc-shaped segment 102b at the fourth endpoint K. The line connecting the convex portion A and the fourth endpoint K is the third connecting line AK, and the second concave point Y1 is the point on the third arc-shaped segment 102b farthest from the third connecting line AK. The fan blade 100 is used for rotatable connection with the fan blade disk 300, and the fan blade 100 can retract or expand relative to the fan blade disk 300 around the rotation axis O. Figure 8 As shown, on the projection of the fan blade 100 along the rotation axis O, let the intersection of the trailing edge 104 and the tail edge 103 be the second endpoint M, and the line connecting the projection point of the rotation axis O and the second endpoint M be the second connecting line OM. Let the reference line passing through the second concave point Y1 and perpendicular to the connecting line OM intersect with the second connecting line OM at the second projection point Y2. Let the distance between the second endpoint M and the projection point of the rotation axis O be L1, and the distance between the second projection point Y2 and the projection point of the rotation axis O be L3, then 0.2L1≤L3≤0.3L1.

[0103] If L3 is too large, the second concave point Y1 will be too close to the convex part A, resulting in a smaller width at the convex part A, which is not conducive to increasing the windward area of ​​the fan blade 100 at the convex part A. If L3 is too small, the second concave point Y1 will be too close to the leading edge 101, resulting in a larger width of the fan blade 100 at the third arc segment 102b, which is not conducive to reducing the weight of the fan blade 100.

[0104] In some examples, such as Figure 9 As shown, the fan blade 100 is rotatably connected to the fan blade disk 300, and the fan blade 100 can retract or expand relative to the fan blade disk 300 around the rotation axis O. On the projection pattern of the fan blade 100 along the rotation axis O, let the intersection of the trailing edge 104 and the tail edge 103 be the second endpoint M, and the line connecting the projection point of the rotation axis O and the second endpoint M be the second connecting line OM. Let the reference line passing through the protrusion A and perpendicular to the connecting line OM intersect with the second connecting line OM at the third projection point Q.

[0105] Let L1 be the distance between the second endpoint M and the rotation axis O, and L4 be the distance between the third projection point Q and the projection point of the rotation axis O. Then 0.5L1 ≤ L4 ≤ 0.75L1. It can be understood that the value of L4 / L1 can represent the distance of the convex part A from the first edge 101 or the last edge 103. If L4 / L1 is large, it indicates that the convex part A is closer to the last edge 103 and farther from the first edge 101. If L4 / L1 is small, it indicates that the convex part A is farther from the last edge 103 and closer to the first edge 101.

[0106] If L4 / L1 is too large, the air-facing area of ​​the fan blade 100 near the trailing edge 103 will be too large, resulting in significant noise from the fan blade 100. If L4 / L1 is too small, the air-facing area of ​​the fan blade 100 near the leading edge 101 will be too large. However, since the linear velocity of the fan blade 100 near the leading edge 101 is relatively low, its efficiency is also low. Therefore, if point A is too close to the leading edge 101, it will be difficult to increase the airflow of the fan blade.

[0107] To verify the effect of the position of the protrusion A on the fan blade 100, an experimental test was conducted on a fan having the fan blade 100 according to an embodiment of this disclosure. Figure 10 As shown, the horizontal axis represents the ratio of L4 to L1, and the vertical axis represents the fan power. When L4 = L1 (L4 / L1 = 1), it can be considered as the case where fan blade 100 does not have the protrusion A. From... Figure 10 As can be seen, as the ratio of L4 to L1 increases, the fan power first increases and then decreases. For example... Figure 11 As shown, the horizontal axis represents the ratio of L4 to L1, and the vertical axis represents the maximum fan speed. From Figure 11 As can be seen, as the ratio of L4 to L1 increases, the maximum fan speed first increases and then decreases. Figure 12 As shown, the horizontal axis represents the ratio of L4 to L1, and the vertical axis represents the fan noise. Figure 12 As can be seen, compared to fan blade 100 without a protrusion, the noise of the fan decreases after adding protrusion A. (Summary) Figures 10-12 As shown, when 0.5L1≤L4≤0.75L1, the fan has a larger power and maximum wind speed, while the noise is smaller. Therefore, the fan has a better overall blowing effect at this time.

[0108] In some examples, such as Figure 13 As shown, let α be the angle between the line connecting the first endpoint N and the second endpoint M of the trailing edge 103 and the horizontal plane S2. Then 0°≤α≤15°, where the second endpoint M is the intersection of the trailing edge 103 and the trailing edge 104. If α is too large, the frontal area of ​​the fan blade 100 will be too large, resulting in greater noise from the fan blade 100.

[0109] This disclosure embodiment conducted experimental tests on three types of fans having the fan blade 100, with L4 / L1 ratios of 1 / 4, 1 / 2, and 3 / 4 respectively. Figure 14 As shown, the horizontal axis represents the value of α, and the vertical axis represents the fan power. From Figure 14 As can be seen, the power of the three types of fans gradually increases with the increase of α. For example... Figure 15 As shown, the horizontal axis represents the value of α, and the vertical axis represents the maximum fan speed. From... Figure 15 As can be seen, the maximum wind speed of the three types of fans gradually increases with the increase of α. Figure 16 As shown, the horizontal axis represents the value of α, and the vertical axis represents the fan noise. From Figure 16 As can be seen, the noise of all three types of fans gradually increases with the increase of α, and the noise increases significantly when α increases to 20°. Furthermore, it was found during the experiment that when α increases to 20°, the fan produces a "whooshing" starting noise. Considering that the fan should have high power and maximum airflow while having low noise, the setting was 0°≤α≤15°.

[0110] In some examples, such as Figure 5 As shown, the fan blade 100 can expand or retract relative to the fan blade disk 300. When the fan blade 100 is retracted relative to the fan blade disk 300, on the projection diagram of the ceiling fan along the central axis P, the intersection of the line connecting the projection point of the central axis P and the protrusion A with the trailing edge 104 is set as the fourth projection point E. Figure 13 As shown, the angle between the line connecting the fourth projection point E and the convex part A and the horizontal plane S2 is γ, then 15°≤γ≤40°. The reference plane is perpendicular to the central axis P. If γ is too large, the windward area of ​​the fan blade 100 will be too large, resulting in significant noise from the fan blade 100. If γ is too small, the windward area of ​​the fan blade 100 will be too small, resulting in less airflow from the fan blade 100.

[0111] This disclosure discloses an embodiment of an experimental test conducted on a fan having the fan blade 100. Among other things, Figures 17-19 Let α = 5° and L4 / L1 = 1 / 2 and 3 / 4, respectively, be the relationship between fan power, maximum wind speed, noise and γ-α. Figures 20-22 The relationship between fan power, maximum wind speed, noise, and γ-α is given when α = 15° and L4 / L1 is 1 / 2 and 3 / 4, respectively. Figures 17-22 As can be seen, the fan power and maximum airflow speed gradually increase with the increase of γ-α, indicating that the fan's airflow effect gradually improves. However, the fan noise also gradually increases with the increase of γ-α. Considering that the fan should have high power and maximum airflow speed while having low noise, the setting is 15°≤γ≤40°.

[0112] In some examples, such as Figure 23 As shown, let the trailing edge 103 and the trailing edge 104 intersect at the second endpoint M, and the trailing edge 104 and the leading edge 101 intersect at the third endpoint C. Let β be the angle between the line connecting the second endpoint M and the third endpoint C and the horizontal plane S2, then 5° ≤ β ≤ 15°. In the projection image of the fan blade 100 onto the vertical plane, where the vertical plane passes through the second endpoint M and the third endpoint C, there is an abrupt change between the trailing edge 104 and the leading edge 101. An angle is formed between the tangent of the leading edge 101 at the third endpoint C and the tangent of the trailing edge 104 at the third endpoint C.

[0113] With the fan blades 100 in the retracted state, at least a portion of the root 100a of each fan blade 100 is located between the fan blade disk 300 and the tail 100b of the adjacent fan blade 100. The tail 100b is the end of the fan blade 100 furthest from the root 100a. Setting 5°≤β≤15° ensures a certain axial distance between the tail 100b of the fan blade 100 and the root 100a of the adjacent fan blade 100, thereby avoiding interference between adjacent fan blades 100.

[0114] This disclosure also provides a ceiling fan, such as... Figure 1 and Figure 2 As shown, the ceiling fan includes a suspension rod 200, a blade disk 300, and multiple blades 100. One end of the suspension rod 200 is fixed to the ceiling, and the other end is rotatably connected to the blade disk 300. The multiple blades 100 are arranged circumferentially, and the root 100a of the blades 100 is rotatably connected to the blade disk 300 through the front edge 101 of the blades 100.

[0115] The fan blade disk 300 can be circular, and the bottom of the suspension rod 200 can be connected to the motor. The motor drives the fan blade disk 300 to rotate, thereby driving the fan blade 100 to rotate.

[0116] Multiple fan blades 100 have an extended state and a retracted state, such as Figure 1 As shown, in the deployed state, a portion of the fan blade 100 extends relative to the sidewall of the fan blade disk 300. (As...) Figure 2 As shown, in the retracted state, the fan blades 100 are retracted relative to the side wall of the fan blade disk 300. This ensures that the fan blades 100 are not exposed when the ceiling fan is not in operation, thereby improving the aesthetics of the ceiling fan.

[0117] When the fan blade disk 300 starts working, it rotates, and the fan blade 100 rotates away from the central axis of the fan blade disk 300 under the action of centrifugal force. The ceiling fan also includes a return spring, one end of which can be connected to the fan blade disk 300, and the other end can be connected to the fan blade 100. When the fan blade disk 300 stops rotating, the fan blade 100 is no longer subject to centrifugal force. At this time, the fan blade 100 can rotate closer to the central axis of the fan blade disk 300 under the pulling force of the return spring.

[0118] This disclosure also provides a fan light, such as Figure 21 As shown, the fan light includes a light assembly 400 and the aforementioned ceiling fan, with the light assembly 400 fixed to the bottom of the fan blade disk 300.

[0119] The fan blade disk 300 can be considered as part of the lamp assembly 400, for example, the fan blade disk 300 can be considered as the top shell of the lamp assembly 4. The operation of the fan blade 100 and the lamp assembly 400 does not interfere with each other. When the fan blade 100 is working, the lamp assembly 400 may or may not be working.

[0120] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A fan blade, characterized in that, The fan blade (100) is used in a ceiling fan. The fan blade (100) includes a first edge (101), a leading edge (102), a trailing edge (103), and a trailing edge (104). The first edge (101) is the edge of the fan blade (100) connected to the fan blade disk (300). The leading edge (102) is the windward edge of the fan blade (100). The trailing edge (104) is the leeward edge of the fan blade (100). The trailing edge (103) is the edge of the fan blade (100) away from the fan blade disk (300). The leading edge (102) includes a protrusion (A) that protrudes in a direction away from the trailing edge (104), and the leading edge (102) is at its highest point in the protrusion (A); The endpoint of the trailing edge (103) that connects to one end of the leading edge (102) is the first endpoint (N), and the first endpoint (N) is in a downward-pressed shape.

2. The fan blade according to claim 1, characterized in that, The endpoint of the trailing edge (103) connecting to one end of the trailing edge (104) is the second endpoint (M). On the projection of the fan blade (100) onto the reference plane (S1), the tangent of the trailing edge (103) at the second endpoint (M) is the first tangent (z1), and the tangent of the trailing edge (103) at the first endpoint (N) is the second tangent (z2). The first endpoint (N) is located below the first tangent (z1), and / or the angle between the first tangent (z1) and the horizontal plane (S2) is greater than the angle between the second tangent (z2) and the horizontal plane (S2); The reference plane (S1) is a plane parallel to the central axis (P) of the ceiling fan and passing through the first endpoint (N) and the second endpoint (M).

3. The fan blade according to claim 2, characterized in that, On the projection pattern of the fan blade (100) on the reference plane (S1), the trailing edge (103) has a first arc segment (1031) that connects to the second endpoint (M), and the concave surface of the first arc segment (1031) faces downward.

4. The fan blade according to any one of claims 1-3, characterized in that, Along the direction from the leading edge (101) to the protrusion (A), the height of the leading edge (102) gradually increases; Along the direction from the protrusion (A) to the trailing edge (103), the height of the leading edge (102) gradually decreases.

5. The fan blade according to any one of claims 1-3, characterized in that, The fan blade (100) can be expanded or retracted relative to the fan blade disk (300), and when the fan blade (100) is retracted relative to the fan blade disk (300), on the projection pattern of the ceiling fan along the central axis (P) of the ceiling fan, if the straight line (g) intersects the projection point of the central axis (P), the first point of the leading edge (102) and the second point of the trailing edge (104), then the distance between the first point and the second point is the width of the fan blade (100) at the first point; The fan blade (100) has the largest width at the protrusion (A).

6. The fan blade according to claim 5, characterized in that, Along the direction from the first edge (101) to the protrusion (A), the width of the fan blade (100) gradually increases; The width of the fan blade (100) gradually decreases along the direction from the protrusion (A) to the trailing edge (103).

7. The fan blade according to claim 5, characterized in that, it is provided that... The width of the fan blade (100) at the protrusion (A) is W1; On the projection of the ceiling fan along the central axis (P) of the ceiling fan, let the distance between the second endpoint (M) and the first endpoint (N) of the trailing edge (103) be W2, then W2≤0.5W1, where the second endpoint (M) is the intersection of the trailing edge (103) and the trailing edge (104).

8. The fan blade according to claim 5, characterized in that, Let the diameter of the fan blade disk (300) be D, and the width of the fan blade (100) at the protrusion (A) be W1, then 0.15D≤W1≤0.3D.

9. The fan blade according to any one of claims 1-3, characterized in that, The leading edge (102) further includes a second arcuate segment (102a), which is located between the protrusion (A) and the trailing edge (103), and the second arcuate segment (102a) is concave in the direction close to the trailing edge (104).

10. The fan blade according to claim 9, characterized in that, The leading edge (102) further includes a third arc-shaped segment (102b), which is located between the protrusion (A) and the first edge (101), and the third arc-shaped segment (102b) is concave in the direction close to the trailing edge (104); The protrusion (A) is formed at the intersection of the second arc segment (102a) and the third arc segment (102b).

11. The fan blade according to claim 10, characterized in that, The second arc segment (102a) has a first concave point (X1), wherein the line connecting the convex part (A) and the first endpoint (N) is a first connecting line (AN), and the first concave point (X1) is the point on the second arc segment (102a) that is farthest from the first connecting line (AN). The fan blade (100) is rotatably connected to the fan blade disk (300), and the fan blade (100) can retract or expand relative to the fan blade disk (300) around the rotation axis (O). On the projection pattern of the fan blade (100) along the rotation axis (O), the intersection of the trailing edge (104) and the tail edge (103) is set as the second endpoint (M), the line connecting the projection point of the rotation axis (O) and the second endpoint (M) is set as the second connecting line (OM), and the intersection of the reference line passing through the first concave point (X1) and perpendicular to the second connecting line (OM) with the second connecting line (OM) is set as the first projection point (X2). Let L1 be the distance between the second endpoint (M) and the projection point of the rotation axis (O), and L2 be the distance between the first projection point (X2) and the projection point of the rotation axis (O). Then 0.7L1≤L2≤0.8L1.

12. The fan blade according to claim 10, characterized in that, The third arc segment (102b) has a second concave point (Y1), wherein the first edge (101) intersects the third arc segment (102b) at the fourth endpoint (K), the line connecting the convex part (A) and the fourth endpoint (K) is the third connecting line (AK), and the second concave point (Y1) is the point on the third arc segment (102b) that is farthest from the third connecting line (AK); The fan blade (100) is rotatably connected to the fan blade disk (300), and the fan blade (100) can retract or expand relative to the fan blade disk (300) around the rotation axis (O). On the projection pattern of the fan blade (100) along the rotation axis (O), the intersection of the trailing edge (104) and the tail edge (103) is set as the second endpoint (M), the line connecting the projection point of the rotation axis (O) and the second endpoint (M) is set as the second connecting line (OM), and the intersection of the reference line passing through the second concave point (Y1) and perpendicular to the second connecting line (OM) with the second connecting line (OM) is set as the second projection point (Y2). Let L1 be the distance between the second endpoint (M) and the projection point of the rotation axis (O), and L3 be the distance between the second projection point (Y2) and the projection point of the rotation axis (O). Then 0.2L1≤L3≤0.3L1.

13. The fan blade according to any one of claims 1-3, characterized in that, The fan blade (100) is rotatably connected to the fan blade disk (300), and the fan blade (100) can be retracted or extended relative to the fan blade disk (300) about the rotation axis (O); On the projection pattern of the fan blade (100) along the rotation axis (O), the intersection of the trailing edge (104) and the tail edge (103) is set as the second endpoint (M), the line connecting the projection point of the rotation axis (O) and the second endpoint (M) is set as the second connecting line (OM), and the intersection of the reference line passing through the protrusion (A) and perpendicular to the second connecting line (OM) with the second connecting line (OM) is set as the third projection point (Q). Let L1 be the distance between the second endpoint (M) and the projection point of the rotation axis (O), and L4 be the distance between the third projection point (Q) and the projection point of the rotation axis (O). Then 0.5L1≤L4≤0.75L1.

14. The fan blade according to any one of claims 1-3, characterized in that, Let the angle between the line connecting the first endpoint (N) and the second endpoint (M) of the trailing edge (103) and the horizontal plane (S2) be α, then 0°≤α≤15°, where the second endpoint (M) is the intersection of the trailing edge (103) and the trailing edge (104).

15. The fan blade according to any one of claims 1-3, characterized in that, The fan blade (100) can be expanded or retracted relative to the fan blade disk (300), and when the fan blade (100) is retracted relative to the fan blade disk (300), on the projection pattern of the ceiling fan along the central axis (P) of the ceiling fan, the intersection of the line connecting the projection point of the central axis (P) and the protrusion (A) with the trailing edge (104) is set as the fourth projection point (E). The angle between the line connecting the fourth projection point (E) and the convex part (A) and the horizontal plane (S2) is γ, then 15°≤γ≤40°.

16. The fan blade according to any one of claims 1-3, characterized in that, Let the trailing edge (104) and the first edge (101) intersect at the third endpoint (C), and the intersection of the trailing edge (104) and the tail edge (103) be the second endpoint (M). Let the angle between the line connecting the second endpoint (M) and the third endpoint (C) and the horizontal plane (S2) be β, then 5°≤β≤15°.

17. A ceiling fan, characterized in that, The ceiling fan includes a hanging rod (200), a blade disc (300), and a plurality of blades (100) as described in any one of claims 1-16; One end of the suspension rod (200) is fixed to the ceiling, and the other end is connected to the fan blade disk (300); One end of each of the fan blades (100) is connected to the fan blade disk (300).

18. A fan light, characterized in that, The fan light includes a lamp assembly (400) and a ceiling fan as described in claim 17; The lamp assembly (400) is fixed to the bottom of the fan blade disk (300).

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