Fan lamp and impeller

Abstract

The invention provides a fan lamp and an impeller, and belongs to the technical field of household appliances. The fan lamp comprises a shell and a fan assembly. The shell is provided with a first air inlet, and the fan assembly is located in the shell. The fan assembly comprises an impeller and a motor, the impeller comprises a bottom plate and a plurality of blades, and the blades are fixed to the bottom plate and surround the first air inlet. The motor comprises a main body part and an output shaft, the main body part is located below the bottom plate, and the output shaft penetrates through the bottom plate. The top of the main body part is higher than the bottom of the head edge of the blade, so that the main body part can fully utilize the internal space of the impeller, and the size of the fan lamp is small. The radial distance between the top of the head edge and the top of the main body part is set as L1, the axial radial direction between the bottom of the head edge and the top of the main body part is set as L2, L1 is larger than L2, and therefore the air inlet amount of the top of the head edge is reduced. As the wind speed is higher and the generated noise is higher closer to the top of the head edge, the noise of the fan lamp can be reduced by reducing the air inlet quantity of the top of the head edge.

Description

[0001] This disclosure claims priority to Chinese patent application No. 202322523767.X filed on September 15, 2023, and utility model name “Ceiling fan and fan lamp with long air supply distance and uniform annular air output”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the technical field of household appliances, and in particular to a fan lamp and an impeller. Background Art

[0003] Fan lamp is a common household appliance that can simultaneously provide air supply and lighting.

[0004] In the related art, a fan lamp includes a housing, an impeller, a motor and a lamp module. Among them, the impeller is an important structure in the fan lamp, and the impeller is connected to the motor, and the motor drives the impeller to rotate, so that the impeller inhales air from the outside of the housing, and the air is accelerated in multiple blades, and then flows out from the trailing edge of the blades, so that the airflow blows to the outside of the housing.

[0005] However, the air supply effect of the fan lamp in the related art is not ideal when it is working. Summary of the invention

[0006] The present disclosure provides a fan light and an impeller, which can solve the technical problems existing in the related technologies. The technical solutions of the fan light and the impeller are as follows.

[0007] In a first aspect, the present disclosure provides a fan light, the fan light comprising a housing and a fan assembly;

[0008] The housing has a first air inlet and a circular opening at the bottom, and the fan assembly is located inside the housing;

[0009] The fan assembly includes an impeller and a motor, the impeller includes a base plate and a plurality of blades, the plurality of blades are fixed to the base plate, and the plurality of blades surround the first air inlet;

[0010] The motor comprises a main body and an output shaft, the output shaft is rotatably connected to the main body, the main body is located below the bottom plate, and the output shaft passes through the bottom plate;

[0011] The top of the main body is higher than the bottom of the leading edge of the blade. Assuming that the radial distance between the top of the leading edge and the top of the main body is L1, and the radial distance between the bottom of the leading edge and the top of the main body is L2, then L1>L2, wherein the leading edge is the edge of the blade close to the first air inlet.

[0012] In a possible implementation manner, the leading edge of the blade has a forward convex structure, and the forward convex structure is located between the top and the bottom of the leading edge.

[0013] In a possible implementation, assuming that the distance between the top of the first edge and the central axis of the annular opening is R1, the distance between the bottom of the first edge and the central axis of the annular opening is R2, and the distance between the forward convex structure and the central axis of the annular opening is R3, then R1>R2>R3.

[0014] In a possible implementation, assuming that the height of the front edge is H1, and the height of the front convex structure (2311) from the bottom plate is H2, then 0.5H1 <H2≤0.8H1。

[0015] In a possible implementation manner, the top of the main body is higher than the bottom of the trailing edge of the blade, wherein the trailing edge is opposite to the leading edge.

[0016] In a possible implementation, assuming that the axial distance between the top of the trailing edge of the blade and the top of the main body is L3, and the axial distance between the bottom of the trailing edge and the top of the main body is L4, then L3>L4; or,

[0017] The fan light also includes a plurality of guide members, which surround the impeller. Assuming that the axial distance between the top of the trailing edge of the blade and the bottom of the head end of the guide member is L5, and the axial distance between the bottom of the trailing edge and the bottom of the head end of the guide member is L6, then L5>L6.

[0018] In a possible implementation, assuming that the axial distance between the top of the trailing edge of the blade and the first volume of the main body is L7, and the axial distance between the bottom of the trailing edge and the first side of the main body is L8, then L7>L8, wherein the first side of the main body is a side of the main body away from the bottom plate; or,

[0019] The fan light also includes a plurality of guide members, which surround the impeller. Assuming that the axial distance between the top of the head end of the guide member and the first side of the main body is L9, and the axial distance between the bottom of the head end of the guide member and the first side of the main body is L10, then L9>L10.

[0020] In a possible implementation manner, along a direction approaching the bottom plate, a distance between a trailing edge of the blade and a central axis of the annular opening gradually decreases, wherein the trailing edge is opposite to the leading edge.

[0021] In a possible implementation, along a direction approaching the bottom plate, a speed at which the distance between the trailing edge of the blade and the center axis of the annular opening decreases gradually decreases.

[0022] In a possible implementation, on the same reference section, the angles between the leading edges of each two adjacent blades and the central axis of the annular opening are not completely the same, wherein the reference section is perpendicular to the central axis of the annular opening.

[0023] In a second aspect, the present disclosure provides an impeller, the impeller comprising a base plate and a plurality of blades;

[0024] The plurality of blades are fixed to the base plate;

[0025] The leading edge of the blade has a forward convex structure, wherein the leading edge is the edge of the blade close to the central axis of the impeller;

[0026] Assume that the height of the front edge is H1, and the height of the front convex structure from the bottom plate is H2, then 0.5H1 <H2≤0.8H1。

[0027] In a possible implementation, assuming that the distance between the forward convex structure and the central axis of the impeller is R3, the distance between the bottom of the leading edge and the central axis is R2, and the distance between the top of the leading edge and the central axis is R1, then R1>R2>R3.

[0028] In a possible implementation, the distance between the trailing edge of the blade and the central axis of the impeller gradually decreases in a direction approaching the bottom plate, wherein the trailing edge is opposite to the leading edge.

[0029] In a possible implementation, assuming that the distance between the bottom of the trailing edge and the central axis is D1, the distance between the top of the trailing edge and the central axis is D2, and the height of the trailing edge is H3, then 0.05H3≤D2-D1≤0.1H3.

[0030] In a possible implementation manner, in a longitudinal section of the blade, the trailing edge is concave.

[0031] In a possible implementation, on the same reference section, the angles between the line connecting the leading edges of each two adjacent blades and the central axis of the impeller are not completely the same, wherein the reference section is perpendicular to the central axis.

[0032] In a possible implementation, the impeller includes seven blades;

[0033] On the same reference section, the angles between the leading edges of each two adjacent blades and the line connecting the central axis of the impeller are 56.5°~57.5°, 47.0°~48.0°, 47.0°~48.0°, 56.5°~57.5°, 52.5°~53.5°, 44.5°~45.5°, and 52.5°~53.5° respectively.

[0034] In a possible implementation, in the longitudinal section of the blade, the area between the front convex structure and the top of the leading edge is convex, and the area between the front convex structure and the bottom of the leading edge is concave.

[0035] In a possible implementation manner, the thickness of the blade first increases and then decreases in a direction away from the leading edge.

[0036] The technical solution provided by the present disclosure includes at least the following beneficial effects:

[0037] The present disclosure provides a fan lamp, wherein the larger the radial distance between the front edge and the top of the main body, the farther the front edge is from the first air inlet, thereby reducing the air intake of the front edge. Setting L1>L2 can make the top of the front edge farther from the first air inlet, thereby reducing the air intake of the top of the front edge. Since the wind speed is higher near the top of the front edge, the noise generated is greater, therefore reducing the air intake of the top of the front edge can reduce the noise of the fan lamp, thereby improving the air supply effect of the fan lamp.

[0038] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, are used to explain the principles of the present disclosure. In the drawings:

[0040] Figure 1 is an exploded view of a fan lamp shown in an embodiment of the present disclosure;

[0041] Figure 2 is a structural schematic diagram of a fan lamp shown in an embodiment of the present disclosure;

[0042] Figure 3 is a bottom view of a fan lamp shown in an embodiment of the present disclosure;

[0043] Figure 4 is a structural schematic diagram of a fan lamp shown in an embodiment of the present disclosure;

[0044] Figure 5 is a cross-sectional view of a fan lamp shown in an embodiment of the present disclosure;

[0045] Figure 6 is a schematic diagram of the central angles and wind-sensing radius occupied by two ends of a flow guide member shown in an embodiment of the present disclosure;

[0046] Figure 7 is a wind direction schematic diagram of a fan lamp shown in an embodiment of the present disclosure;

[0047] Figure 8 is a wind direction schematic diagram of a fan lamp shown in an embodiment of the present disclosure;

[0048] Fig. 9 is a structural schematic diagram of a fan lamp shown in an embodiment of the present disclosure;

[0049] Fig.10 is a half-section view of a fan lamp shown in an embodiment of the present disclosure;

[0050] Fig.11 is a half-section view of a fan lamp shown in an embodiment of the present disclosure;

[0051] Fig.12 is a schematic structural diagram of an impeller shown in an embodiment of the present disclosure;

[0052] Fig.13 is a schematic structural diagram of an impeller shown in an embodiment of the present disclosure;

[0053] Fig.14 is a half-section view of an impeller shown in an embodiment of the present disclosure;

[0054] Fig.15 is a half-section view of an impeller shown in an embodiment of the present disclosure;

[0055] Fig.16 is a schematic diagram of the structure of a blade shown in an embodiment of the present disclosure;

[0056] Fig.17 is a cross-sectional view of a blade shown in an embodiment of the present disclosure;

[0057] Fig.18 It is a half-section view of a fan light shown in an embodiment of the present disclosure.

[0058] Legend:

[0059] 1. housing, 11. first air inlet, 12. annular opening, 120. air outlet;

[0060] 2. impeller, 21. top plate, 210. second air inlet, 22. bottom plate, 220. air outlet, 23. blade, 231. leading edge, 2311. front convex structure, 232. trailing edge, 20. motor, 201. main body, 202. output shaft;

[0061] 3. air guide member, 31. first air guide surface, 311. first sub-air guide surface, 312. second sub-air guide surface, 32. second air guide surface;

[0062] 4. Light module;

[0063] a. The first reference line;

[0064] b. Second reference line;

[0065] c. The third reference line;

[0066] d. fourth reference line;

[0067] O. Central axis.

[0068] The above drawings have shown clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0069] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0070] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0071] The present disclosure provides a fan lamp. Figure 1-Figure 4As shown, the fan lamp includes a housing 1 and a fan assembly. The housing 1 has a first air inlet 11 and a circular opening 12 at the bottom, and the fan assembly is located inside the housing 1. A plurality of air guides 3 surround the fan assembly and divide the circular opening 12 into a plurality of air supply ports 120. The air guide 3 has a first air guide surface 31 and a second air guide surface 32, the first air guide surface 31 faces the fan assembly, the head end of the first air guide surface 31 is connected to the head end of the second air guide surface 32, and an air supply port 120 is provided between the second air guide surface 32 of one air guide 3 and the first air guide surface 31 of the adjacent air guide 3.

[0072] Among them, Figure 4 As shown, in a reference plane perpendicular to the central axis of the annular opening 12, the line between the head end of the first wind guide surface 31 or the head end of the second wind guide surface 32 and the central axis of the annular opening 12 is set as the first reference line a, the line between the end of the first wind guide surface 31 and the central axis of the annular opening 12 is set as the second reference line b, and the line between the end of the second wind guide surface 32 and the central axis of the annular opening 12 is set as the third reference line c, then the third reference line c is located between the first reference line a and the second reference line b.

[0073] The axis of the annular opening 12 , the axis of the fan assembly and the axis of the entire fan lamp are collinear. The air guide 3 is a shielding tongue, which is used to shield a part of the annular opening 12 .

[0074] like Figure 5 As shown, the fan assembly includes an impeller 2 and a motor 20. The motor 20 is fixed to the housing 1. The impeller 2 and the motor 20 are transmission connected. The impeller 2 is opposite to the first air inlet 11. The fan assembly can be a centrifugal fan or a diagonal flow fan.

[0075] In the fan light provided in the embodiment of the present disclosure, the angle occupied by the first wind guide surface 31 of the guide member 3 is the angle between the first reference line a and the second reference line b, and the angle occupied by the portion shielded by the guide member 3 is the angle between the third reference line c and the second reference line b. Since the third reference line c is located between the first reference line a and the second reference line b, the angle occupied by the first wind guide surface 31 is greater than the angle occupied by the portion shielded by the guide member 3.

[0076] In this way, the air guide member 3 has a first air guide surface 31 of sufficient length, and the length of the portion shielded by the air guide member 3 is relatively short, so that the fan lamp not only has a long air delivery distance, but also the air blown out of each air outlet can be continuous in the circumferential direction, and the annular air outlet of the fan lamp is more uniform. In addition, the above design also makes the second air guide surface 32 longer, and the second air guide surface 32 can also play a good air guide effect.

[0077] In some examples, such as Figure 4As shown, assuming that the angle between the second reference line b and the third reference line c is α, then 20°<α<30°.

[0078] like Figure 6 As shown in the figure, the horizontal axis represents α, the unit is °, and the vertical axis represents the wind feeling radius, that is, the blowing radius that the user can feel when using the fan light provided by the embodiment of the present disclosure, the unit is m.

[0079] from Figure 6 As can be seen from the figure, as α increases, the wind-sensing radius also gradually increases. Since the wind-sensing radius is smaller when 0°<α<20°, α>20° can be set. When α>30°, although the wind-sensing radius is still increasing, it will cause the guide member 3 to block too much of the annular opening 12, making the air outlet 120 too small, thereby making the fan light air output uneven. Therefore, in some examples, 20°<α<30°.

[0080] In some examples, such as Figure 4 As shown, assuming the number of the guide members 3 is z, then 130° / α<z<150° / α. That is, the angle of the portion shielded by the plurality of guide members 3 is at least 130° and at most 150°.

[0081] According to experimental measurements, if z<130° / α, i.e., zα<130°, the angle occupied by the shielded portion of the multiple air guides 3 is too small, which will make the air outlet area of ​​each air outlet 120 larger, making it difficult for the air outlet 120 to increase the wind pressure and wind force. At the same time, the length of the first air guide surface 31 and the second air guide surface 32 will be shorter, making the airflow on the first air guide surface 31 and the second air guide surface 32 have a smaller pressure boost path, which is not conducive to increasing the air pressure at the air outlet 120.

[0082] If z>150° / α, that is, zα>150°, the total shielding portion of the multiple air guide members 3 will be too large, which will cause the air supply port 120 to be too small. Although the air pressure at the air supply port 120 will be higher, since there is no air coming out from the air guide member 3, the wind blown out of the multiple air supply ports 120 will be difficult to be continuous in the circumferential direction, making the annular air supply of the fan lamp uneven.

[0083] In some examples, such as Figure 4 As shown, 4≤z≤6. Exemplarily, z=6.

[0084] In some examples, such as Figure 4 As shown, in the reference plane, the angle between the first reference line a and the third reference line c is assumed to be γ, and 0°<γ<15°.

[0085] If γ is too large, the angle between the first air guide surface 31 and the second air guide surface 32 will be too small, making it difficult to process the air guide member 3. If γ is too small, the above-mentioned annular air outlet will not be more uniform.

[0086] The above technical solution enables the wind blown out of each air outlet 120 to be continuous in the circumferential direction, thus realizing a relatively uniform annular air outlet of the fan lamp. In addition, the uniformity of the wind blown out of each air outlet 120 also affects the uniformity of the annular air outlet.

[0087] Next, an exemplary description is given of how to improve the uniformity of air blowing from each air outlet 120 .

[0088] In some examples, such as Figure 4 As shown, in the reference plane, the angle between the first wind guiding surface 31 and the second wind guiding surface 32 is δ, and δ is an acute angle.

[0089] like Figure 7 As shown, δ is set to an acute angle so that part of the wind blown by the fan assembly to the guide member 3 is blown along the first air guide surface 31 to the part of the air supply port 120 close to the first air guide surface 31, and the other part is blown along the second air guide surface 32 to the part of the other air supply port 120 close to the second air guide surface 31. In this way, for one air supply port 120, both the part close to the first air guide surface 31 and the part close to the second air guide surface 32 have a large air volume, so that the air outlet of the air supply port 120 is more uniform. Alternatively, it can also be described as that, since there is an air supply port 120 between the second air guide surface 32 of one air guide member 3 and the first air guide surface 31 of the adjacent air guide member 3, part of the airflow in each air supply port 120 comes from the first air guide surface 31 of one air guide member 3, and the other part comes from the second air guide surface 32 of another air guide member 3. Therefore, the wind blown out at the air supply port 120 is more uniform.

[0090] like Figure 8 As shown, when δ is an obtuse angle, on the one hand, without changing the air guiding lengths of the first air guide surface 31 and the second air guide surface 32, δ being an obtuse angle will cause the angle occupied by the portion shielded by the guide member 3 to be greater than the angle occupied by the first air guide surface 31, resulting in a longer length of the portion shielded by the guide member 3, making the annular air outlet of the fan lamp uneven.

[0091] On the other hand, it will also cause a greater impact between the air outlet of the fan assembly and the second air guide surface 32, resulting in a greater airflow impact loss. Since there is an air outlet 120 between the first air guide surface 31 of the air guide member 3 and the second air guide surface 32 of the adjacent air guide member, if δ is too large, the airflow near the first air guide surface 31 of the air outlet 120 will be larger and the wind force will be stronger, while the airflow near the second air guide surface 32 of the air outlet 120 will be smaller and the wind force will be weaker, resulting in uneven air outlet at the air outlet 120.

[0092] In some examples, such as Figure 4 As shown, 9°<δ<38°. If δ is too small, the connection between the first air guide surface 31 and the second air guide surface 32 cannot produce an effective fillet radius, making the air guide member 3 difficult to process, increasing the complexity and cost of processing the fan light.

[0093] In some examples, such as Fig. 9 As shown, the angle between the tangent line of the head end of the first wind guide surface 31 and the first reference line a is and In this way, the angle between the wind blown out by the fan assembly and the first wind guide surface 31 can be reduced, thereby reducing the impact of the first wind guide surface 31 on the airflow, and further reducing the airflow loss. As a result, the wind force at the air outlet 120 close to the first wind guide surface 31 is close to the wind force at the second wind guide surface 32, so that the air outlet 120 can discharge air more evenly.

[0094] In some examples, such as Figure 7 and Fig. 9 As shown, the second wind guide surface 32 is arc-shaped, and the concave surface of the second wind guide surface 32 faces the first wind guide surface 31 of the guide member 3 which is closest to the second wind guide surface 32. In the reference plane, along the rotation direction of the fan assembly, the angle between the tangent of the second wind guide surface 32 and the radial direction of the annular opening 12 gradually decreases.

[0095] On the one hand, compared with the second air guide surface 32 being straight, setting the second air guide surface 32 to be arc-shaped can increase the length of the second air guide surface 32, thereby increasing the pressurization path of the airflow, which is conducive to increasing the wind pressure. Since the length of the first air guide surface 31 is relatively long, increasing the length of the second air guide surface 32 can reduce the pressure difference between the end of the first air guide surface 31 and the end of the second air guide surface 32, so that the air outlet 120 is more uniform. At the same time, it is also possible to reduce the central angle occupied by the guide member 3 without reducing the air guide length of the first air guide surface 31, that is, the central angle occupied by the air outlet 120 is larger. In this way, the wind blown out of the annular opening 12 can be continuous, that is, the air outlet of the annular opening 12 is more uniform.

[0096] On the other hand, the second wind guiding surface 32 can deflect the wind flow direction toward the radial direction of the fan assembly, so that the airflow has a larger radial component after flowing to the air supply port 120, which is conducive to the airflow blowing to a longer distance.

[0097] In some examples, such as Fig. 9As shown, in the reference plane, let the angle between the tangent line at the end of the second air guide surface 32 and the line connecting the central axis of the second air guide surface 32 and the annular opening 12 be ε, then 0°<ε<20°. In this way, the angle between the wind direction at the end of the second air guide surface 32 and the radial direction of the annular opening 12 can be made smaller, so that the second air guide surface 32 can deflect the air outlet direction toward the radial direction of the fan lamp, which is conducive to increasing the radial air supply distance of the fan lamp.

[0098] In some examples, such as Fig. 9 As shown, the distance between the head end of the first air guiding surface 31 and the central axis of the annular opening 12 is r1, the radius of the fan assembly is R, and r1 / R≥1.05. Thus, the head end of the first air guiding surface 31 has sufficient air guiding space, which is conducive to guiding the airflow to the air supply port 120.

[0099] If r1 is too small, the gap between the head end of the first wind guide surface 31 and the edge of the impeller 2 will be smaller, and the wind guide space at the head end of the first wind guide surface 31 will be smaller, making it difficult for the wind blown out by the fan assembly to pass through the guide member 3, making it easy for the airflow to flow back.

[0100] In some examples, such as Fig. 9 As shown, along the rotation direction of the fan assembly, the first wind guide surface 31 sequentially includes a first sub-wind guide surface 311 and a second sub-wind guide surface 312. The second sub-wind guide surface 312 is arc-shaped, and the convex surface of the second sub-wind guide surface 312 faces the fan assembly.

[0101] On the one hand, the second sub-wind guide surface 312 can deflect the flow direction of the wind toward the radial direction of the fan assembly. As a result, the airflow has a larger radial component after flowing to the air supply port 120, which is conducive to the airflow blowing to a farther distance. And because the concave surface of the second wind guide surface 32 faces the first wind guide surface 31 of the other air guide member 3, the angle between the second wind guide surface 32 and the second sub-wind guide surface 312 of the other air guide member 3 is small. In this way, the angle between the airflow near the second sub-wind guide surface 312 of the air supply port 120 and the airflow near the second wind guide surface 32 is small, so that the wind direction at various places of the air supply port 120 is more uniform, thereby improving the uniformity of the air outlet of the air supply port 120.

[0102] On the other hand, the radial deflection of the second sub-air guide surface 312 toward the fan assembly can reduce the central angle of the air guide member 3 without reducing the air guide length of the first air guide surface 31, that is, the central angle of the air outlet 120 is larger. In this way, the wind blown out of the annular opening 12 can be continuous, that is, the air outlet of the annular opening 12 is more uniform.

[0103] In some examples, such as Fig. 9As shown, in the reference plane, let the angle between the tangent of the end of the second sub-wind guide surface 312 and the line connecting the end of the second sub-wind guide surface 312 and the central axis of the annular opening 12 be ω, then 0°<ω<20°. In this way, the angle between the wind direction at the end of the second sub-wind guide surface 312 and the radial direction of the annular opening 12 can be made smaller, which is beneficial to increase the radial air supply distance of the fan lamp. At the same time, the wind direction at the end of the second sub-wind guide surface 312 can be made close to the wind direction at the end of the second wind guide surface 32, so that the air outlet 120 can have a more uniform air flow.

[0104] In some examples, such as Fig. 9 As shown, the first sub-wind guiding surface 311 and the second sub-wind guiding surface 312 are tangent to each other at the connection point, so that the airflow can flow smoothly from the first sub-wind guiding surface 311 to the second sub-wind guiding surface 312, thereby reducing airflow loss.

[0105] In some examples, the concave surface of the first sub-air guiding surface 311 faces the fan assembly, which is beneficial for gathering the airflow and guiding the airflow to the second sub-air guiding surface 312 .

[0106] In some examples, such as Fig. 9 As shown, assuming that the distance between the end of the first sub-wind guide surface 311 and the axis of the fan assembly is r2, and 1.015<r2 / r1<1.2, it is beneficial for the first sub-wind guide surface 311 to gather the airflow, and it is also beneficial for the first sub-wind guide surface 311 to guide the airflow to the second sub-wind guide surface 312.

[0107] In some examples, such as Fig. 9 As shown, in the reference plane, the line between the end of the first sub-wind guiding surface 311 and the central axis of the annular opening 12 is the fourth reference line d, and the angle between the second reference line b and the fourth reference line d is β, and β<α.

[0108] If β>α, the length of the first wind guide sub-surface 311 will increase, so that the impact between the airflow and the first wind guide sub-surface 311 is greater, so that the wind blown out by the fan assembly encounters greater resistance, thereby increasing the load of the fan assembly.

[0109] In some examples, such as Figure 5 As shown, the housing 1 comprises an outer shell 101 and an inner shell 102, wherein the outer shell 101 surrounds the inner shell 102. The top of the outer shell 101 has a first air inlet 11, and an annular opening 12 is formed between the bottom of the outer shell 101 and the bottom of the inner shell 102. The air guide 3 is connected to the inner wall of the outer shell 101.

[0110] In some examples, the first air inlet 11 may also be located at a side of the outer shell 101 , or at the bottom of the inner shell 102 .

[0111] In some examples, such as Figure 5As shown, the top of the air guide 3 abuts against the outer shell 101, and / or the bottom of the air guide 3 abuts against the inner shell 102, and along the air outlet direction, the size of the air guide 3 in the vertical direction gradually decreases. Therefore, the spacing between the outer shell 101, the inner shell 102 and the air guide 3 that abut against each other also decreases. Since the total amount of air outlet of the fan assembly remains unchanged, and the spacing between the outer shell 101 and the inner shell 102 gradually decreases along the airflow direction, the air pressure of the airflow will gradually increase, thereby increasing the air supply distance of the fan.

[0112] In some examples, such as Figure 5 As shown, the outer shell 101 includes a first arc-shaped portion 1011, and the inner shell 102 includes a second arc-shaped portion 1021. The concave surface of the first arc-shaped portion 1011 faces the convex surface of the second arc-shaped portion 1021, and a plurality of flow guides 3 are located between the first arc-shaped portion 1011 and the second arc-shaped portion 1021. In this way, the airflow blown out by the fan assembly can flow along the arc, so that the airflow flows more smoothly, avoiding airflow loss caused by a sudden change in the direction of the airflow.

[0113] In some examples, such as Figure 5 As shown, the top and bottom of the guide member 3 are both arc-shaped, and fit with the first arc-shaped portion 1011 and the second arc-shaped portion 1021 respectively. Among them, the angle between the top of the guide member 3, and / or the bottom of the guide member 3 and the horizontal plane gradually increases along the air outlet direction. Since the fan assembly blows out the guide wind in the horizontal direction, and the fan lamp needs to blow downward, the angle between the bottom of the guide member 3 and the horizontal plane gradually increases along the air outlet direction, which can gradually guide the airflow to the vertical direction.

[0114] In some examples, such as Figure 5 As shown, the maximum dimension of the guide member 3 in the vertical direction is d1, the dimension of the annular opening 12 is d2, and 2.5<d1 / d2<7. <d1 / d2<6。

[0115] Since the diameter of the outer shell 101 and the diameter of the inner shell 102 are larger than the diameter of the fan assembly, if d1 / d2 is too small, it may still cause the ventilation area of ​​the annular opening 12 (the ventilation area between the end of the first arc portion 1011 and the end of the second arc portion 1021) to be larger than the ventilation area of ​​the edge of the fan assembly, thereby causing the flow velocity of the airflow in the air duct to gradually decrease, causing the airflow to easily generate vortices in the air duct, resulting in a shorter air supply distance of the annular opening 12.

[0116] If d1 / d2 is too large, although the ventilation area of ​​the annular opening 12 will be smaller than the ventilation area of ​​the edge of the fan assembly, it will cause the ventilation area of ​​the annular opening 12 to be too small, thereby hindering the airflow and making the air output at the annular opening 12 too small, which is not conducive to increasing the air supply distance.

[0117] In some examples, such as Figure 2 As shown, the guide member 3 and the housing 101 are an integral structure, the housing 101 and the guide member 3 are integrally formed, the housing wall of the housing 101 is concave to form the guide member 3, and the outer wall of the housing 101 has a recessed portion 1011 at a portion corresponding to the guide member 3. In this way, the connection strength between the guide member 3 and the housing 101 can be enhanced, and the processing difficulty of the guide member 3 and the housing 101 can be reduced.

[0118] Of course, in some other examples, the flow guide 3 may also be an integral structure with the inner shell 102. Alternatively, the flow guide 3 is a separate part connected to the outer shell 101 and the inner shell 102 through a connecting component.

[0119] In some examples, the inner shell 102 is connected to the bottom of the guide member 3, thereby achieving the connection between the inner shell 102 and the outer shell 101. Since the airflow generated by the fan assembly does not flow out from the position where the guide member 3 is opposite to the annular opening 12, the connecting parts (such as bolts and screws, etc.) are arranged at the bottom of the guide member 3, so as not to hinder the flow of the airflow.

[0120] In some examples, the outer wall surface of the housing 101 is covered with sound-absorbing cotton to reduce the noise generated by the flow of air.

[0121] In some examples, the fan light also includes a light module 4. Figure 1 and Figure 5 As shown, the inner shell 102 has a receiving groove. The lamp module 4 can directly set the lamp source in the receiving groove, and the inner shell 102 can be regarded as a mounting base for the lamp source. Alternatively, the lamp module 4 is an integral component and is detachably connected to the bottom of the inner shell 102.

[0122] The following is an exemplary description of the implementation of the fan assembly.

[0123] In some examples, such as Fig.10 As shown, the fan assembly includes an impeller 2 and a motor 20. The impeller 2 includes a bottom plate 22 and a plurality of blades 23, the plurality of blades 23 are fixed to the bottom plate 22, and the plurality of blades 23 surround the first air inlet 11. The motor 20 includes a main body 201 and an output shaft 202, the output shaft 202 is rotatably connected to the main body 201, the main body 201 is located below the bottom plate 22, and the output shaft 202 passes through the bottom plate 22. Assuming that the radial distance between the top of the leading edge 231 of the blade 23 and the top of the main body 201 is L1, and the radial distance between the bottom of the leading edge 231 and the top of the main body 201 is L2, then L1>L2, wherein the leading edge 231 is the edge of the blade 23 close to the first air inlet 11.

[0124] In the technical solution provided by the embodiments of the present disclosure, the greater the radial distance between the leading edge 231 and the top of the main body 201, the farther the leading edge 231 is from the first air inlet 11, so that the air intake of the leading edge 231 is less. Setting L1 > L2 can make the top of the leading edge 231 far from the first air inlet 11, thereby reducing the air intake at the top of the leading edge 231. Since the wind speed is higher and the generated noise is greater closer to the top of the leading edge 231, reducing the air intake at the top of the leading edge 231 can reduce the noise of the fan light.

[0125] In some examples, as Figure 12-14 shown, the leading edge 231 of the blade 23 has a forward convex structure 2311, and the forward convex structure 2311 is located between the top and the bottom of the leading edge 231.

[0126] In some examples, as Fig.12 and Fig.15 shown, let the distance between the top of the leading edge 231 and the central axis of the annular opening 12 be R1, the distance between the bottom of the leading edge 231 and the central axis of the annular opening 12 be R2, and the distance between the forward convex structure 2311 and the central axis of the annular opening 12 be R3. Then R1 > R2 > R3. Since the forward convex structure 2311 is located at the foremost side of the leading edge 231, the distance R3 between the forward convex structure 2311 and the central axis of the annular opening 12 is the smallest, so both R1 and R2 are greater than R3. In this way, the forward convex structure 2311 can change the air flow direction earlier, thereby reducing the eddy current and further reducing the wind noise.

[0127] The greater the distance between the leading edge 231 and the central axis of the annular opening 12, the farther the leading edge 231 is from the first air inlet 11, so that the air intake of the leading edge 231 is less. Setting R1 > R2 can reduce the air intake at the top of the leading edge 231. Since the wind speed is higher and the generated noise is greater closer to the top of the leading edge 231, reducing the air intake at the top of the leading edge 231 can reduce the noise of the fan light.

[0128] In some examples, as Fig.15 shown, let the height of the leading edge 231 be H1, and the height of the forward convex structure 2311 from the bottom plate 22 be H2. Then 0.5H1 < H2 ≤ 0.8H1. Through simulation and test data, when 0.5H1 < H2 ≤ 0.8H1, the noise reduction effect of the leading edge 231 is the best. If the height H2 of the forward convex structure 2311 from the bottom plate 22 is too high, the distance between the forward convex structure 2311 and the top of the leading edge 231 will be too small. According to aerodynamics, the smaller the cross-sectional area of the space through which the air flow passes, the faster the air flow velocity. Therefore, if the distance between the forward convex structure 2311 and the top of the leading edge 231 is too small, the air flow velocity between the forward convex structure 2311 and the top of the leading edge 231 will be relatively fast, which will cause a relatively large wind noise here, thus being not conducive to reducing the wind noise of the impeller 3.

[0129] In some examples, such as Fig.10 As shown, the top of the main body 201 is higher than the bottom of the trailing edge 232 of the blade 23, wherein the trailing edge 232 is opposite to the leading edge 231. In this way, the main body 201 can make full use of the space inside the impeller 2, thereby reducing the height of the fan assembly and further reducing the volume of the fan lamp.

[0130] In some examples, such as Fig.10 As shown, assuming that the axial distance between the top of the trailing edge 232 of the blade 23 and the top of the main body 201 is L3, and the axial distance between the bottom of the trailing edge 232 and the top of the main body 201 is L4, then L3>L4. Thus, the trailing edge 232 of the blade 23 can guide the airflow as much as possible. If L4>L3, most of the trailing edge 232 will be lower than the top of the main body 201, which may cause the gas flowing through the leading edge 231 of the blade 23 to be concentrated in the top area of ​​the trailing edge 232. On the one hand, the airflow at the trailing edge 232 is uneven. On the other hand, the airflow may hit the top area of ​​the trailing edge 232 more strongly, thereby generating greater noise.

[0131] or, as Fig.11 As shown, the fan light also includes a plurality of guide members 3, which surround the impeller 2. Assuming that the axial distance between the top of the trailing edge 232 of the blade 23 and the bottom of the head end of the guide member 3 is L5, and the axial distance between the bottom of the trailing edge 232 and the bottom of the head end of the guide member 3 is L6, then L5>L6.

[0132] The embodiment of the present disclosure does not specifically limit the shape of the flow guide 3. Figure 2 As shown, the guide member 3 may be in the shape of a shielding tongue. Fig.12 As shown, the flow guide 3 may also be in the form of a sheet.

[0133] In some examples, such as Fig.11 As shown, assuming that the axial distance between the top of the trailing edge 232 of the blade 23 and the first side of the main body 201 is L7, and the first side distance between the bottom of the trailing edge 232 and the bottom of the main body 201 is L8, then L7>L8. Wherein, the first side of the main body 201 is the side of the main body 201 away from the bottom plate 22. Or, the fan lamp further includes a plurality of guide members 3, and the plurality of guide members 3 surround the impeller 2. assuming that the axial distance between the top of the head end of the guide member 3 and the bottom of the main body 201 is L9, and the axial distance between the bottom of the head end of the guide member 3 and the bottom of the main body 201 is L10, then L9>L10. Wherein, when the main body 201 extends into the interior of the impeller 2, the first side of the main body 201 is the top of the main body 201. When the main body 201 is located below the impeller 2, the first side of the main body 201 is the bottom of the main body 201.

[0134] In some examples, such as Fig.15 and Fig.17 As shown, the distance between the trailing edge 232 of the blade 23 and the central axis of the annular opening 12 gradually decreases in the direction close to the bottom plate 22, wherein the trailing edge 232 is opposite to the leading edge 231. In this way, it is possible to prevent the airflow distributed axially along the trailing edge 232 from simultaneously escaping from the trailing edge 232. The escaping of the airflow from the trailing edge 232 is one of the main reasons for the wind noise generated by the blade 23, so the wind noise at the trailing edge 232 can be reduced if the airflow does not escaping from the trailing edge 232 at the same time.

[0135] In some examples, such as Fig.17 As shown, the speed at which the distance between the trailing edge 232 of the blade 23 and the central axis of the annular opening 12 decreases gradually in the direction close to the bottom plate 22. If the speed at which the distance between the trailing edge 232 near the bottom and the central axis of the annular opening 12 decreases is still relatively large, the bottom of the blade 23 will be too short, and the airflow acceleration path will be too short, resulting in too low wind speed at the bottom of the trailing edge 232, which is not conducive to increasing the air supply distance of the fan lamp.

[0136] In some examples, such as Fig.18 As shown, on the same reference section, the angles between the leading edges 231 of each two adjacent blades 23 and the central axis of the annular opening 12 are not completely the same, wherein the reference section is perpendicular to the central axis of the annular opening 12 .

[0137] In the related art, the reason why the impeller generates strong discrete noise is that multiple blades are evenly distributed in the circumferential direction, which causes the airflow to have the same pulsation frequency when it hits any blade, thereby increasing the pulsation frequency of the impeller, and further causing the impeller to have a higher noise. Therefore, in the embodiment of the present disclosure, the angle between the leading edge 231 of each two adjacent blades 23 and the line connecting the central axis is set to be a different angle, which can prevent the airflow from colliding with the leading edges 231 of multiple blades 23 at the same time, thereby reducing the wind noise of the impeller.

[0138] The present disclosure also provides an impeller, such as Fig.13 and Fig.14 As shown, the impeller 2 includes a base plate 22 and a plurality of blades 23, and the plurality of blades 23 are fixed to the base plate 22. Fig.12 and Fig.13 As shown, the leading edge 231 of the blade 23 has a convex structure 2311, wherein the leading edge 231 is the edge of the blade 23 close to the central axis O of the impeller. Assuming that the height of the leading edge 231 is H1, and the height of the convex structure 2311 from the bottom plate 22 is H2, then 0.5H1 <H2≤0.8H1。

[0139] In some examples, such as Fig.13 and Fig.14 As shown, the impeller 2 may further include a top plate 21, and a plurality of blades 23 are fixed between the top plate 21 and the bottom plate 22. The top plate 21 has a second air inlet 210, and the plurality of blades 23 surround the second air inlet 210. An air outlet 220 is formed between the edge of the top plate 21 and the edge of the bottom plate 22, and the trailing edge 232 of the blade 23 divides the air outlet 220 into a plurality of sub-air outlets. When the impeller 2 rotates, air flows into the impeller from the second air inlet 210, accelerates in the blade 23, and then flows out from the air outlet 220.

[0140] In the technical solution provided by the embodiment of the present disclosure, when the impeller 2 operates, air flows into the interior of the impeller 2 and flows toward the leading edge 231 of the blade 23. The leading edge 231 has a forward convex structure 2311, and the forward convex structure 2311 is a bionic design of the convex structure of the leading edge of a bird wing. The convex structure of the leading edge of a bird wing can change the direction of gas flow, reduce the eddy current in the air flow, and thus reduce the air resistance during flight. According to the principle of bionics, the forward convex structure 2311 can imitate the convex structure of the leading edge of a bird wing to reduce the eddy current at the leading edge 231 of the blade 23, making the air flow smoother, so that the air resistance received by the leading edge 231 of the blade 23 is smaller, and thus the wind noise at the leading edge 231 is reduced. Moreover, setting the forward convex structure 2311 at the leading edge 231 can make the local mass of the leading edge 231 larger, thereby reducing the vibration of the blade 23 caused by aerodynamic force, and thus reducing the noise.

[0141] In addition, since the upper half region of the leading edge 231 of the blade 23 is closer to the first air inlet 11, the wind speed in the upper half region of the leading edge 231 is greater. According to aerodynamics, the greater the wind speed, the easier it is to generate eddy currents, resulting in greater wind noise. Therefore, reducing the eddy current in the upper half region of the leading edge 231 can achieve a good noise reduction effect on the impeller. Therefore, setting H2 > 0.5H1 can make the forward convex structure 2311 closer to the upper half region of the leading edge 231, thereby reducing the air resistance in the upper half region of the leading edge 231, and thus making the wind noise in the upper half region of the leading edge 231 smaller.

[0142] Through simulation and test data, it is obtained that when 0.5H1 < H2 ≤ 0.8H1, the noise reduction effect of the leading edge 231 is the best. If the height H2 of the forward convex structure 2311 from the bottom plate is too high, the distance between the forward convex structure 2311 and the top of the leading edge 231 will be too small. According to aerodynamics, the smaller the cross-sectional area of the space through which the air flow passes, the faster the air flow velocity. Therefore, if the distance between the forward convex structure 2311 and the top of the leading edge 231 is too small, it will cause the air flow velocity between the forward convex structure 2311 and the top of the leading edge 231 to be faster, and thus the wind noise here will be greater, which is not conducive to reducing the wind noise of the impeller.

[0143] In some examples, such as Fig.15As shown, assuming that the distance between the front convex structure 2311 and the central axis O of the impeller is R3, the distance between the bottom of the leading edge 231 and the central axis O is R2, and the distance between the top of the leading edge 231 and the central axis O is R1, then R1>R2>R2.

[0144] Since the convex structure 2311 is located at the frontmost side of the leading edge 231, the distance R3 between the convex structure 2311 and the central axis O is the smallest, so R1 and R2 are both greater than R3. In this way, the convex structure 2311 can change the airflow direction as early as possible, thereby reducing vortex and further reducing wind noise.

[0145] The closer the distance between the leading edge 231 and the central axis O is, the closer the leading edge 231 is to the first air inlet 11, and the sooner the airflow can be guided, so that the air intake of the leading edge 231 is larger. Therefore, setting R1>R2 can make the air intake at the bottom of the leading edge 231 larger and the air intake at the top smaller. When the air intake of the first air inlet 11 is the same, the larger the air intake at the bottom of the leading edge 231, the smaller the air intake at the top of the leading edge 231. Since the wind speed at the bottom of the leading edge 231 is lower, the noise generated is also lower. Therefore, the more air intake at the bottom of the leading edge 231, the smaller the noise generated by the blade 23.

[0146] In some examples, such as Fig.16 and Fig.17 As shown, the distance between the trailing edge 232 of the blade 23 and the central axis O of the impeller gradually decreases in the direction close to the bottom plate 22, wherein the trailing edge 232 is opposite to the leading edge 231. In this way, it is possible to prevent the airflow distributed axially along the trailing edge 232 from simultaneously escaping from the trailing edge 232. The escaping of the airflow from the trailing edge 232 is one of the main reasons for the wind noise generated by the blade 23, so the wind noise at the trailing edge 232 can be reduced if the airflow does not escaping from the trailing edge 232 at the same time.

[0147] In some examples, such as Fig.16 and Fig.17 As shown, assuming that the distance between the bottom of the trailing edge 232 and the central axis O is D1, the distance between the top of the trailing edge 232 and the central axis O is D2, and the height of the trailing edge 232 is H3, then 0.05H3≤D2-D1≤0.1H3.

[0148] Assume ΔD=D2-D1. If ΔD is too small, the airflow will easily break away from the top and bottom of the trailing edge 232 at the same time, which is not conducive to reducing the wind noise at the trailing edge 232. Since the blade 23 cannot exceed the outer edge of the bottom plate 22, if ΔD is too large, the bottom of the trailing edge 232 will be too short, which will make the path of the airflow at the bottom of the trailing edge 232 too small, making the flow rate and pressure of the airflow at the bottom of the trailing edge 232 much smaller than the flow rate and pressure of the airflow at the top of the trailing edge 232, resulting in uneven pressure distribution at the trailing edge 232, which in turn affects the stable operation of the impeller 2 and may cause the noise of the impeller 2 to increase. According to simulation and test data, when 0.05H3≤ΔD≤0.1H3, the noise generated by the impeller 2 is the smallest.

[0149] In some examples, such as Fig.17 As shown, in the longitudinal section of the blade 23, the trailing edge 232 is concave. Since the wind speed of the airflow in the middle part and the lower part of the trailing edge 232 is relatively high, setting the trailing edge 232 to be concave can make the airflow in the middle part and the lower part leave the trailing edge 232 as soon as possible, reducing the acceleration path of the airflow in the middle part and the lower part of the trailing edge 232, so that the flow speed of the airflow here is relatively low, which is conducive to reducing the wind noise at the trailing edge 232.

[0150] In some examples, such as Fig.18 As shown, on the same reference section, the angles between the leading edges 231 of each two adjacent blades 23 and the line connecting the central axis O of the impeller 2 are not completely the same. The reference section is perpendicular to the central axis O.

[0151] In the related art, the reason why the impeller generates strong discrete noise is that multiple blades are evenly distributed in the circumferential direction, which results in the same pulsation frequency when the airflow hits any blade, thereby enhancing the pulsation frequency of the impeller, and further resulting in a larger noise of the impeller. Therefore, in the embodiment of the present disclosure, the angle between the leading edge 231 of each two adjacent blades 23 and the line connecting the central axis O of the impeller 2 is set to be a different angle, which can avoid the airflow from colliding with the leading edges 231 of multiple blades 23 at the same time, and thus can reduce the wind noise of the impeller 2.

[0152] After the above design, the multiple blades 23 are non-uniformly distributed, which may cause the center of gravity of the impeller 2 to deviate from the geometric center of the impeller 2, making it difficult for the impeller 2 to achieve dynamic balance when rotating, and further causing vibration when the impeller 2 rotates. Therefore, in order to ensure that the blades 23 can reduce noise while achieving the coincidence of the center of gravity and the geometric center of the impeller 2, the embodiment of the present disclosure uses the unequal angle distribution formula modulated by sinusoidal frequency for calculation, so as to determine the angle between the leading edge 231 of each two adjacent blades 23 and the line connecting the central axis O of the impeller.

[0153] In some examples, such as Fig.18As shown, the impeller 2 comprises seven blades 23 .

[0154] Based on the formula α i =α i ’ +Δαsin(Kα i ’ ), determine the angle between the leading edge 231 of each two adjacent blades 23 and the line connecting the central axis O of the impeller. Wherein K is the number of groups, and in this application, K can be taken as 1, α i ’ is the circumferential arrangement angle of the i-th blade 23 when the blades 23 are evenly arranged (the angle between the lines connecting the i-th blade 23 and the (i+1)-th blade 23 and the central axis O of the impeller 2), α i is the circumferential arrangement angle of the i-th blade 23 when the blades 23 are arranged unevenly, and Δα is the phase modulation amount. Wherein, Δα=360°×uneven coefficient / number of blades, and the uneven coefficient can be defined by oneself (such as 0.44).

[0155] On the same reference section, it is assumed that the angles formed by the leading edges 231 of every two adjacent blades 23 and the central axis O of the impeller are α1, α2, α3, α4, α5, α6 and α7 respectively. Calculation shows that α1...α7 are 57.22°, 47.42°, 47.42°, 57.22°, 52.86°, 45° and 52.86° respectively.

[0156] Considering the precision and tolerance of the impeller 2 during injection molding, the angles formed between the leading edge 231 of each two adjacent blades 23 and the central axis O of the impeller 2 are set to be 56.5°-57.5°, 47.0°-48.0°, 47.0°-48.0°, 56.5°-57.5°, 52.5°-53.5°, 44.5°-45.5°, and 52.5°-53.5°, respectively. In this way, the wind noise of the impeller 2 can be reduced, and the center of gravity of the impeller 2 can be ensured to coincide with the geometric center as much as possible.

[0157] In some examples, such as Fig.17 As shown, in the longitudinal section of the blade 23, the area between the front convex structure 2311 and the top of the leading edge 231 is convex, and the area between the front convex structure 2311 and the bottom of the leading edge 231 is concave. Through simulation and experiments, it can be known that setting the leading edge 231 in the above shape is conducive to reducing wind noise at the leading edge 231.

[0158] In some examples, such as Fig.18 As shown, in the cross section of the blade 23, the end surface of the leading edge 231 is arc-shaped everywhere. Compared with the end surface of the leading edge 231 being flat, the arc-shaped resistance to the airflow is smaller, and the cutting effect and guiding effect on the airflow are better, which is conducive to reducing the wind noise of the impeller.

[0159] In some examples, such as Fig.18 As shown, the thickness of the blade 23 increases first and then decreases in the direction close to the trailing edge 232. The cross section of the blade 23 may be a NACA6508 airfoil, so that the surface of the blade 23 is not prone to boundary layer separation. It is known from aerodynamics that boundary layer separation is one of the main reasons for the wind noise generated by the blade 23. Therefore, reducing the boundary layer separation on the surface of the blade 23 can reduce the aerodynamic noise of the impeller 2.

[0160] In some examples, such as Figure 4 As shown, the plurality of blades 23 are arranged in a vortex shape. The guide member 3 is used to guide the airflow blown out by the impeller 2 to flow in an annular direction, wherein the guide direction of the plurality of guide members 3 is opposite to the vortex direction of the plurality of blades 23 .

[0161] In the embodiment of the present application, opposite direction means that the extension direction from the leading edge 231 of the blade 23 to the trailing edge 232 is towards a different side from the guide direction of the plurality of guide members 3 , and does not indicate that the guide direction is 180° opposite to the vortex direction.

[0162] The “vortex arrangement” means that in the direction from the center of the impeller 2 to the edge (in the direction away from the rotation axis of the impeller 2), the distance between two adjacent blades 23 gradually increases, and the direction from the leading edge 231 of the blade 23 to the trailing edge 232 thereof intersects with the radial direction of the impeller 2. This vortex shape can also be called a spiral shape. The vortex direction (or spiral direction) can be determined as the direction from the leading edge 231 of the blade 23 to the trailing edge 232 thereof, for example Figure 4 The distance between two connected blades 23 is to divide the air outlet of the impeller 2 into a plurality of air outlet gaps. When the impeller 2 rotates, the air flows out in a circular direction through the air outlet, and the air outlet direction of the air outlet is consistent with the vortex direction of the blade 23, for example Figure 4 The air outlet blows out air in a clockwise direction.

[0163] When the guide member 3 is a sheet-shaped guide member, the guide direction of the multiple guide members 3 can be determined as each guide member 3 is directed from its leading edge to its trailing edge. When the guide member 3 includes a first guide surface 31 and a second guide surface 32, the guide direction of the multiple guide members 3 includes each first guide surface 31 being directed from its leading edge to its trailing edge, and each second guide surface 32 being directed from its leading edge to its trailing edge. The leading edge of the guide member 3 is a side edge of the guide member 3 close to the rotation axis of the impeller 2, and the trailing edge of the guide member 3 is a side edge of the guide member 3 away from the rotation axis. Figure 4 The flow guiding direction of the multiple flow guiding members 3 is counterclockwise.

[0164] The technical solution provided by the embodiment of the present disclosure can make the fan lamp produce less noise when working, because the impeller 2 in the fan lamp produces less noise when rotating, thereby bringing a good user experience.

[0165] It should be noted that, in some embodiments, the concave surface, convex surface, etc. referred to in the article refer to the general direction of the surface. In other embodiments, the concave surface may also be provided with a partial convex surface for other effects.

[0166] The present disclosure also provides a fan light, which includes a housing 1 and an impeller 2 , wherein the impeller 2 is located inside the housing 1 .

[0167] In some examples, such as Fig.12 As shown, the impeller 2 includes a base plate 22 and a plurality of blades 23, and the plurality of blades 23 are fixed to the base plate 22. Figure 13-Figure 15 As shown, the leading edge 231 of the blade 23 has a convex structure 2311, wherein the leading edge 231 is the edge of the blade 23 close to the central axis O of the impeller. Assuming that the height of the leading edge 231 is H1, and the height of the convex structure 2311 from the bottom plate 22 is H2, then 0.5H1 <H2≤0.8H1。

[0168] The convex structure 2311 is a bionic design of the convex structure of the leading edge of a bird's wing. The convex structure of the leading edge of a bird's wing can change the direction of gas flow, reduce vortices in the airflow, and thus reduce air resistance during flight. According to the principle of bionics, the convex structure 2311 can imitate the convex structure of the leading edge of a bird's wing to reduce the vortices at the leading edge 231 of the blade 23, making the airflow more stable, thereby reducing the air resistance of the leading edge 231 of the blade 23, and further reducing the wind noise at the leading edge 231. In addition, the provision of the convex structure 2311 at the leading edge 231 can make the local mass of the leading edge 231 larger, thereby reducing the flutter of the blade 23 caused by aerodynamic force, thereby reducing noise.

[0169] In addition, since the upper area of ​​the leading edge 231 of the blade 23 is closer to the first air inlet 11, the wind speed in the upper area of ​​the leading edge 231 is greater. From aerodynamics, it can be seen that the greater the wind speed, the easier it is to generate vortices, which leads to greater wind noise. Therefore, reducing the vortices in the upper area of ​​the leading edge 231 can have a good noise reduction effect on the impeller, so setting H2>0.5H1 can make the convex structure 2311 closer to the upper area of ​​the leading edge 231, thereby reducing the air resistance in the upper area of ​​the leading edge 231, so that the wind noise in the upper area of ​​the leading edge 231 is smaller.

[0170] Through simulation and test data, it is obtained that when 0.5H1 < H2 ≤ 0.8H1, the noise reduction effect of the leading edge 231 is the best. If the height H2 of the protruding structure 2311 from the bottom plate is too high, the distance between the protruding structure 2311 and the top of the leading edge 231 will be too small. According to aerodynamics, the smaller the cross-sectional area of the space through which the air flow passes, the faster the air flow velocity. Therefore, if the distance between the protruding structure 2311 and the top of the leading edge 231 is too small, it will cause the air flow velocity between the protruding structure 2311 and the top of the leading edge 231 to be relatively fast, resulting in a relatively large wind noise here, which is not conducive to reducing the wind noise of the impeller 2.

[0171] In some examples, such as Fig.15 As shown, let the distance between the protruding structure 2311 and the central axis O of the impeller 2 be R3, the distance between the bottom of the leading edge 231 and the central axis O be R2, and the distance between the top of the leading edge 231 and the central axis O be R1. Then R1 > R2 > R3.

[0172] Since the protruding structure 2311 is located at the foremost side of the leading edge 231, the distance R3 between the protruding structure 2311 and the central axis O is the smallest. Therefore, both R1 and R2 are greater than R3. In this way, the protruding structure 2311 can change the air flow direction as early as possible, thereby reducing eddy currents and further reducing wind noise.

[0173] The closer the leading edge 231 is to the central axis O, the closer the leading edge 231 is to the first air inlet 11, and the earlier it can guide the air flow, so that the air intake volume of the leading edge 231 is larger. Therefore, setting R1 > R2 can make the air intake volume at the bottom of the leading edge 231 larger and the air intake volume at the top smaller. When the air intake volume of the first air inlet 11 is the same, the larger the air intake volume at the bottom of the leading edge 231 and the smaller the air intake volume at the top. Since the wind speed at the bottom of the leading edge 231 is lower and the generated noise is also lower, the more air intake volume at the bottom of the leading edge 231, the smaller the noise generated by the blade 23.

[0174] In some examples, such as Fig.17 As shown, along the direction close to the bottom plate 22, the distance between the trailing edge 232 of the blade 23 and the central axis O of the impeller 2 gradually decreases. Among them, the trailing edge 232 is opposite to the leading edge 231. In this way, it can be avoided that the air flow axially distributed along the trailing edge 232 detaches from the trailing edge 232 simultaneously. The detachment of the air flow from the trailing edge 232 is one of the main reasons for the generation of wind noise by the blade 23. Therefore, the non-simultaneous detachment of the air flow from the trailing edge 232 can reduce the wind noise at the trailing edge 232.

[0175] In some examples, such as Fig.16 and Fig.17As shown, assuming that the distance between the bottom of the trailing edge 232 and the central axis O is D1, the distance between the top of the trailing edge 232 and the central axis O is D2, and the height of the trailing edge 232 is H3, then 0.05H3≤D2-D1≤0.1H3.

[0176] Assume ΔD=D2-D1. If ΔD is too small, the airflow will easily break away from the top and bottom of the trailing edge 232 at the same time, which is not conducive to reducing the wind noise at the trailing edge 232. Since the blade 23 cannot exceed the outer edge of the bottom plate 22, if ΔD is too large, the bottom of the trailing edge 232 will be too short, which will make the path of the airflow at the bottom of the trailing edge 232 too small, making the flow rate and pressure of the airflow at the bottom of the trailing edge 232 much smaller than the flow rate and pressure of the airflow at the top of the trailing edge 232, resulting in uneven pressure distribution at the trailing edge 232, which in turn affects the stable operation of the impeller 2 and may cause the noise of the impeller 2 to increase. According to simulation and test data, when 0.05H3≤ΔD≤0.1H3, the noise generated by the impeller 2 is the smallest.

[0177] In some examples, such as Fig.18 As shown, on the same reference section, the angles between the leading edges 231 of each two adjacent blades 23 and the line connecting the central axis O of the impeller 2 are not completely the same. The reference section is perpendicular to the central axis O.

[0178] In the related art, the reason why the impeller generates strong discrete noise is that multiple blades are evenly distributed in the circumferential direction, which results in the same pulsation frequency when the airflow hits any blade, thereby enhancing the pulsation frequency of the impeller, and further resulting in a larger noise of the impeller. Therefore, in the embodiment of the present disclosure, the angle between the leading edge 231 of each two adjacent blades 23 and the line connecting the central axis O of the impeller 2 is set to be a different angle, which can avoid the airflow from colliding with the leading edges 231 of multiple blades 23 at the same time, and thus can reduce the wind noise of the impeller 2.

[0179] After the above design, the multiple blades 23 are non-uniformly distributed, which may cause the center of gravity of the impeller 2 to deviate from the geometric center of the impeller 2, making it difficult for the impeller 2 to achieve dynamic balance when rotating, and further causing vibration when the impeller 2 rotates. Therefore, in order to ensure that the blades 23 can reduce noise while achieving the coincidence of the center of gravity and the geometric center of the impeller 2, the embodiment of the present disclosure calculates through the unequal angle distribution formula modulated by sinusoidal frequency, so as to determine the angle between the leading edge 231 of each two adjacent blades 23 and the line connecting the central axis O of the impeller 2.

[0180] In some examples, such as Fig.18 As shown, the impeller 2 comprises seven blades 23 .

[0181] Based on the formula α i =α i ’+Δαsin(Kα i ’ ), determine the angle between the leading edge 231 of each two adjacent blades 23 and the line connecting the central axis O of the impeller. Wherein K is the number of groups, and in this application, K can be taken as 1, α i ’ is the circumferential arrangement angle of the i-th blade 23 when the blades 23 are evenly arranged (the angle between the lines connecting the i-th blade 23 and the (i+1)-th blade 23 and the central axis O of the impeller 2), α i is the circumferential arrangement angle of the i-th blade 23 when the blades 23 are arranged unevenly, and Δα is the phase modulation amount. Wherein, Δα=360°×uneven coefficient / number of blades, and the uneven coefficient can be defined by oneself (such as 0.44).

[0182] On the same reference section, the angles formed between the leading edge 231 of each two adjacent blades 23 and the central axis O of the impeller are α1, α2, α3, α4, α5, α6 and α7 respectively. After calculation, it is found that α1...α7 are 57.22°, 47.42°, 47.42°, 57.22°, 52.86°, 45° and 52.86° respectively. Considering the precision and tolerance of the impeller 2 during injection molding, the angles formed between the leading edge 231 of each two adjacent blades 23 and the central axis O of the impeller are 56.5°-57.5°, 47.0°-48.0°, 47.0°-48.0°, 56.5°-57.5°, 52.5°-53.5°, 44.5°-45.5° and 52.5°-53.5° respectively. In this way, the wind noise of the impeller 2 can be reduced and the center of gravity of the impeller 2 can be ensured to coincide with the geometric center as much as possible.

[0183] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A fan light, characterized in that: The fan lamp comprises a housing (1) and a fan assembly; The housing (1) has a first air inlet (11) and a bottom with an annular opening (12), and the fan assembly is located inside the housing (1); The fan assembly comprises an impeller (2) and a motor (20), the impeller (2) comprises a base plate (22) and a plurality of blades (23), the plurality of blades (23) are fixed to the base plate (22), and the plurality of blades (23) surround the first air inlet (11); The motor (20) comprises a main body (201) and an output shaft (202), wherein the output shaft (202) is rotatably connected to the main body (201), the main body (201) is located below the bottom plate (22), and the output shaft (202) passes through the bottom plate (22); The top of the main body (201) is higher than the bottom of the leading edge (231) of the blade (23). Assuming that the radial distance between the top of the leading edge (231) and the top of the main body (201) is L1, and the radial distance between the bottom of the leading edge (231) and the top of the main body (201) is L2, then L1>L2, wherein the leading edge (231) is the edge of the blade (23) close to the first air inlet (11).

2. The fan light according to claim 1, characterized in that: The leading edge (231) of the blade (23) has a forward convex structure (2311), and the forward convex structure (2311) is located between the top and the bottom of the leading edge (231).

3. The fan light according to claim 2, characterized in that The distance between the top of the first edge (231) and the central axis of the annular opening (12) is R1, the distance between the bottom of the first edge (231) and the central axis of the annular opening (12) is R2, and the distance between the front convex structure (2311) and the central axis of the annular opening (12) is R3, then R1>R2>R3.

4. The fan light according to claim 2, characterized in that The height of the front edge (231) is H1, and the height of the front convex structure (2311) from the bottom plate (22) is H2, then 0.5H1 <H2≤0.8H1。 5. The fan light according to claim 1, characterized in that: The top of the main body (201) is higher than the bottom of the trailing edge (232) of the blade (23), wherein the trailing edge (232) is opposite to the leading edge (231).

6. The fan light according to claim 5, characterized in that: Assuming that the axial distance between the top of the trailing edge (232) of the blade (23) and the top of the main body (201) is L3, and the axial distance between the bottom of the trailing edge (232) and the top of the main body (201) is L4, then L3>L4; or, The fan lamp further comprises a plurality of flow guides (3), wherein the plurality of flow guides (3) surround the impeller (2), and the axial distance between the top of the trailing edge (232) of the blade (23) and the bottom of the head end of the flow guide (3) is assumed to be L5, and the axial distance between the bottom of the trailing edge (232) and the bottom of the head end of the flow guide (3) is assumed to be L6, then L5>L6.

7. The fan light according to claim 5, characterized in that: Assuming that the axial distance between the top of the trailing edge (232) of the blade (23) and the first side of the main body (201) is L7, and the axial distance between the bottom of the trailing edge (232) and the first side of the main body (201) is L8, then L7>L8, wherein the first side of the main body (201) is a side of the main body (201) away from the bottom plate (22); or, The fan lamp further comprises a plurality of guide members (3), wherein the plurality of guide members (3) surround the impeller (2), and assuming that the axial distance between the top of the head end of the guide member (3) and the first side of the main body (201) is L9, and the axial distance between the first side of the head end of the guide member (3) and the bottom of the main body (201) is L10, then L9>L10.

8. The fan light according to claim 1, characterized in that: In a direction approaching the bottom plate (22), the distance between the trailing edge (232) of the blade (23) and the center axis of the annular opening (12) gradually decreases, wherein the trailing edge (232) is opposite to the leading edge (231).

9. The fan light according to claim 8, characterized in that: In the direction approaching the bottom plate (22), the speed at which the distance between the trailing edge (232) of the blade (23) and the center axis of the annular opening (12) decreases gradually decreases.

10. The fan light according to claim 1, characterized in that: On the same reference section, the angles between the leading edges (231) of each two adjacent blades (23) and the central axis of the annular opening (12) are not completely the same, wherein the reference section is perpendicular to the central axis of the annular opening (12).

11. An impeller, characterized in that: The impeller comprises a bottom plate (22) and a plurality of blades (23); The plurality of blades (23) are fixed to the bottom plate (22); The leading edge (231) of the blade (23) has a forward convex structure (2311), wherein the leading edge (231) is the edge of the blade (23) close to the central axis (O) of the impeller; Assuming that the height of the front edge (231) is H1, and the height of the front convex structure (2311) from the bottom plate (22) is H2, then 0.5H1 <H2≤0.8H1。 12. The impeller according to claim 11, characterized in that The distance between the forward convex structure (2311) and the central axis (O) of the impeller is R3, the distance between the bottom of the leading edge (231) and the central axis (O) is R2, and the distance between the top of the leading edge (231) and the central axis (O) is R1, then R1>R2>R3.

13. The impeller according to claim 11, characterized in that Along the direction approaching the bottom plate (22), the distance between the trailing edge (232) of the blade (23) and the central axis (O) of the impeller gradually decreases, wherein the trailing edge (232) is opposite to the leading edge (231).

14. The impeller according to claim 13, characterized in that Assuming that the distance between the bottom of the trailing edge (232) and the central axis (O) is D1, the distance between the top of the trailing edge (232) and the central axis (O) is D2, and the height of the trailing edge (232) is H3, then 0.05H3≤D2-D1≤0.1H3.

15. The impeller according to claim 13, characterized in that In the longitudinal section of the blade (23), the trailing edge (232) is concave.

16. The impeller according to claim 11, characterized in that On the same reference section, the angle between the leading edge (231) of each two adjacent blades (23) and the line connecting the central axis (O) of the impeller is not completely the same, wherein the reference section is perpendicular to the central axis (O).

17. The impeller according to claim 16, characterized in that The impeller comprises seven blades (23); On the same reference section, the angles between the leading edges (231) of each two adjacent blades (23) and the line connecting the central axis (O) of the impeller are 56.5° to 57.5°, 47.0° to 48.0°, 47.0° to 48.0°, 56.5° to 57.5°, 52.5° to 53.5°, 44.5° to 45.5°, and 52.5° to 53.5°, respectively.

18. The impeller according to any one of claims 11 to 17, characterized in that: In the longitudinal section of the blade (23), the area between the front convex structure (2311) and the top of the leading edge (231) is convex, and the area between the front convex structure (2311) and the bottom of the leading edge (231) is concave.

19. The impeller according to any one of claims 11 to 17, characterized in that: The thickness of the blade (23) first increases and then decreases in a direction away from the leading edge (231).

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