Ceiling fan and fan lamp

Abstract

The invention provides a ceiling fan and a fan lamp, and belongs to the technical field of household appliances. The ceiling fan comprises a shell assembly, a wind wheel and a motor. The shell assembly is provided with an air duct and a silencing cavity. The motor is in transmission connection with the wind wheel and used for driving the wind wheel to rotate. The silencing cavity surrounds the air duct or is surrounded by the air duct, and a plurality of silencing holes are formed in the cavity wall of the silencing cavity and communicate with the air duct. When air flow enters the shell assembly, the air flow flows in the air duct. The silencing cavity surrounds the air duct or is surrounded by the air duct, namely, the silencing cavity is located on one side of the air duct. Therefore, sound waves generated by airflow in the air channel can enter the silencing cavity through the silencing holes, the sound waves rub with the silencing holes, the sound waves can consume a large amount of sound energy in the friction process, noise generated by the airflow is reduced, and then noise of the ceiling fan is reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of household appliances, in particular to a ceiling fan and a fan lamp. BACKGROUND

[0002] Ceiling fans are commonly used household appliances. Ceiling fans have a housing assembly, a fan wheel and a motor. The fan wheel is located inside the housing assembly. The motor drives the fan wheel to rotate and suck air from the air inlet of the housing assembly, and then accelerates the airflow to the outside through the air outlet of the housing assembly.

[0003] However, the ceiling fan in the related art produces a large noise, and therefore how to reduce the noise of the ceiling fan is a key problem to be solved. SUMMARY

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

[0005] In a first aspect, the present disclosure provides a ceiling fan, which comprises a housing assembly, a fan wheel and a motor.

[0006] The housing assembly is provided with an air duct and a sound absorbing cavity.

[0007] The fan wheel is located in the air duct, the motor is in transmission connection with the fan wheel, and the motor is used to drive the fan wheel to rotate.

[0008] The sound absorbing cavity surrounds the air duct or is surrounded by the air duct, the cavity wall of the sound absorbing cavity is provided with a plurality of sound absorbing holes, and the plurality of sound absorbing holes are in communication with the air duct.

[0009] In a possible implementation, the housing assembly comprises an outer shell and an inner shell.

[0010] The outer shell comprises a first outer shell and a second outer shell, the first outer shell surrounds the inner shell, and the air duct is formed between the first outer shell and the inner shell.

[0011] The second outer shell surrounds the first outer shell, the sound absorbing cavity is formed between the second outer shell and the first outer shell, and the sound absorbing holes of the sound absorbing cavity are located on the shell wall of the first outer shell.

[0012] In a possible implementation, in a reference plane, the radius of the side wall of the first outer shell is L1, the radius of the side wall of the second outer shell is L2, and 1.05L1≤L2≤1.1L1, wherein the reference plane is perpendicular to the central axis of the fan wheel.

[0013] In a possible implementation, the housing assembly comprises an outer shell, an inner shell and a plurality of shielding tongues.

[0014] The outer shell surrounds the inner shell, and the wind channel is formed between the outer shell and the inner shell;

[0015] The plurality of shielding tongues are arranged on the inner side of the outer shell, and the shielding tongues protrude towards the inner shell, and the sound-absorbing cavity is formed between the shielding tongues and the outer shell, and the sound-absorbing holes of the sound-absorbing cavity are located on the shielding tongues.

[0016] In a possible implementation, the shell assembly includes an outer shell, an inner shell, and a sound absorber;

[0017] The outer shell surrounds the inner shell, and the wind channel is formed between the outer shell and the inner shell, and the top of the outer shell has an opening, the opening surrounds the sound absorber, and an annular air inlet is formed between the opening and the outer wall of the sound absorber.

[0018] The sound absorber has a sound-absorbing cavity surrounding the axis of the opening, and the sound-absorbing holes on the sound-absorbing cavity are located on the outer wall of the sound absorber facing the opening.

[0019] In a possible implementation, the sound absorber includes a first sound-absorbing plate and a second sound-absorbing plate;

[0020] The first sound-absorbing plate and the second sound-absorbing plate are annular, the second sound-absorbing plate surrounds the first sound-absorbing plate, and the annular sound-absorbing cavity is formed between the first sound-absorbing plate and the second sound-absorbing plate, and the sound-absorbing holes are located on the side wall of the second sound-absorbing plate.

[0021] In a possible implementation, in a reference plane, the radius of the opening is R1, and the distance between the outer wall of the sound absorber and the central axis of the opening is R2, and 0.3R1≤R2≤0.5R1, where the reference plane is perpendicular to the central axis of the opening.

[0022] In a possible implementation, the wind wheel includes a bottom plate and a plurality of blades;

[0023] The plurality of blades are fixed to the bottom plate and arranged in a circumferential direction, and the plurality of blades surround the sound absorber.

[0024] In a possible implementation, the ceiling fan further includes a suspension bracket;

[0025] The suspension bracket is connected to the top of the outer shell, the opening surrounds the suspension bracket, and the top of the sound absorber is connected to the suspension bracket.

[0026] In a possible implementation, the suspension bracket has a mounting portion and a containing portion;

[0027] The mounting portion is configured to mount the ceiling fan to a ceiling;

[0028] The accommodating portion extends into the space between the outer shell and the inner shell through the opening, the motor is located in the accommodating portion, and the sound absorber surrounds the accommodating portion.

[0029] In a possible implementation, the height of the wind wheel is H, the axial distance between the bottom of the sound absorber and the top of the wind wheel is H2, and 0.3H1≤H2≤0.5H1.

[0030] In a possible implementation, the shell assembly includes an outer shell and an inner shell, the outer shell surrounds the inner shell, and the air duct is formed between the outer shell and the inner shell.

[0031] The inner shell has the sound absorption cavity, and the sound absorption holes on the sound absorption cavity are located on the side wall of the inner shell facing the wind wheel.

[0032] In a possible implementation, the side wall of the inner shell facing the wind wheel includes a middle portion and an edge portion.

[0033] The middle portion is recessed and opposite to the wind wheel, the edge portion surrounds the wind wheel, and the sound absorption holes are located on the edge portion.

[0034] In a possible implementation, the diameter of the sound absorption holes is 0.5mm-2mm.

[0035] In a second aspect, the disclosure provides a fan lamp, which includes the ceiling fan according to any one of the first aspect and the lamp assembly.

[0036] The lamp assembly is arranged at the bottom of the shell assembly of the ceiling fan.

[0037] In a possible implementation, the shell assembly includes an outer shell and an inner shell, the outer shell surrounds the inner shell, and the air duct is formed between the outer shell and the inner shell.

[0038] The lamp assembly is fixed to the bottom of the inner shell, the sound absorption cavity is formed between the lamp assembly and the inner shell, and the sound absorption holes on the sound absorption cavity are located on the inner shell.

[0039] The technical solutions provided by the disclosure have at least the following beneficial effects:

[0040] This disclosure provides a ceiling fan in which airflow enters the interior of the housing assembly and flows within an air duct. Since the silencing cavity surrounds or is surrounded by the air duct, i.e., is located on one side of the air duct, sound waves generated by the airflow in the air duct can enter the silencing cavity through silencing holes. The sound waves rub against the silencing holes, thereby dissipating the sound energy and reducing the noise generated by the ceiling fan.

[0041] 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

[0042] 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:

[0043] Figure 1 This is a schematic diagram of the structure of a ceiling fan shown in an embodiment of this disclosure;

[0044] Figure 2 This is a schematic diagram of the structure of a ceiling fan shown in an embodiment of this disclosure;

[0045] Figure 3 This is an exploded view of a ceiling fan shown in an embodiment of this disclosure;

[0046] Figure 4 This is a partial structural schematic diagram of a ceiling fan according to an embodiment of the present disclosure;

[0047] Figure 5 This is a cross-sectional view of a fan light shown in an embodiment of this disclosure;

[0048] Figure 6 This is a schematic diagram illustrating the airflow direction of a fan light according to an embodiment of this disclosure;

[0049] Figure 7 This is a partial cross-sectional view of a ceiling fan shown in an embodiment of this disclosure;

[0050] Figure 8 This is a schematic diagram of the structure of a suspension bracket shown in an embodiment of this disclosure;

[0051] Figure 9 This is an exploded view of a second silencer according to an embodiment of this disclosure;

[0052] Figure 10 This is a schematic diagram of the structure of an inner shell shown in an embodiment of this disclosure;

[0053] Figure 11 This is a schematic diagram of the structure of a fan light according to an embodiment of this disclosure;

[0054] Figure 12 This is a line graph showing the noise value of a fan light according to an embodiment of this disclosure;

[0055] Figure 13 This is a line graph showing the noise value of a fan light according to an embodiment of this disclosure.

[0056] Legend:

[0057] 1. Housing assembly; 10. Silencing hole; 101. Air duct; 102. Silencing cavity; 103. Outer shell; 11. First outer shell; 111. Opening; 112. Air outlet; 113. Mounting through hole; 12. Inner shell; 121. Middle part; 122. Edge part; 13. Second outer shell; 14. Silencer; 141. First silencing plate; 142. Second silencing plate; 15. Shielding tongue;

[0058] 2. Wind turbine; 21. Base plate; 22. Blades;

[0059] 3. Electric motor;

[0060] 4. Suspension bracket; 40. Receiving cavity; 41. Mounting part; 42. Receiving part; 43. Cover plate;

[0061] 5. Lighting assembly, 51. LED light.

[0062] 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

[0063] 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.

[0064] 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.

[0065] This disclosure provides a ceiling fan, such as... Figures 1-4 As shown, the ceiling fan includes a housing assembly 1, a fan wheel 2, and a motor 3. Figure 5 As shown, the housing assembly 1 includes an air duct 101 and a silencing cavity 102. The impeller 2 is located within the air duct 101, and a motor 3 is connected to the impeller 2 for driving its rotation. The silencing cavity 102 surrounds or is surrounded by the air duct 101, and its walls are provided with multiple silencing holes 10, which communicate with the air duct 101.

[0066] The housing assembly 1 has an air inlet and an air outlet. When the motor 3 drives the impeller 2 to rotate, the impeller 2 will draw air from the air inlet, causing the airflow to enter the air duct 101. After being accelerated in the impeller 2, the airflow will leave the impeller and then flow to the air outlet through the air duct 101.

[0067] The silencing hole 10 has a pore diameter of 0.5mm-2mm and a porosity of 3%.

[0068] The technical solution provided in this disclosure embodiment allows airflow to enter the interior of the housing assembly 1 and flow within the air duct 101. Since the silencing cavity 102 surrounds or is surrounded by the air duct 101 (i.e., the silencing cavity 102 is located on one side of the air duct 101), sound waves generated by the airflow in the air duct 101 can enter the silencing cavity 102 through the silencing hole 10. The sound waves rub against the silencing hole 10, consuming a large amount of sound energy during this friction process, thereby reducing the noise generated by the airflow and consequently reducing the noise of the ceiling fan.

[0069] The following is an exemplary description of how the silencing cavity 102 surrounds the air duct 101.

[0070] In some examples, such as Figures 3-5 As shown, the housing assembly 1 includes an outer shell 103 and an inner shell 12. The outer shell 103 includes a first outer shell 11 and a second outer shell 13. The first outer shell 11 surrounds the inner shell 12, and an air duct 101 is formed between the first outer shell 11 and the inner shell 12. The second outer shell 13 surrounds the first outer shell 11, and a silencing cavity 102 is formed between the second outer shell 13 and the first outer shell 11. The silencing holes 10 of the silencing cavity 102 are located on the shell wall of the first outer shell 11.

[0071] When the airflow passes through the air duct 101, the sound waves generated by the airflow enter the silencing cavity 102 between the first outer shell 11 and the second outer shell 13 through the silencing hole 10 on the first outer shell 11. This causes the sound waves to rub against the silencing hole 10. During the friction process, the sound waves consume a large amount of sound energy, thereby reducing the noise generated by the airflow.

[0072] The silencing cavity 102 and multiple silencing holes 10 form a micro-perforated plate silencer. The first outer shell 11 can be regarded as a micro-perforated plate, and the silencing cavity 102 is the cavity behind the micro-perforated plate (first outer shell 11), thus forming a cavity resonance sound absorption structure.

[0073] For example, such as Figure 2 As shown, the bottom of the first outer shell 11 and the inner shell 12 form an annular air outlet 112.

[0074] The sound attenuation effect of the anechoic cavity 102 is related to its sound absorption coefficient and bandwidth. The sound absorption coefficient and bandwidth are mainly determined by the acoustic mass m and acoustic impedance r of the micro-perforated plate (first outer shell 11), which in turn are related to the diameter d1 of the anechoic hole 10 and the perforation rate p. The relative acoustic impedance Z of the micro-perforated plate sound-absorbing structure is calculated using formulas one through seven, with the characteristic impedance ρC of air as the unit:

[0075] Formula 1: Z = r + jwm = jctg(WD / C);

[0076] Formula 2: r=atkr / d1zp;

[0077] Formula 3: m = (0.294) × 10⁻³ tkm / p;

[0078] Formula 4: kr=(1+x2 / 32)1 / 2+(2x)1 / 2 / 8×d1 / t;

[0079] Formula 5: km=1+{1+[1 / (9+(x2 / 2))]}+0.85d1 / t;

[0080] Formula 6: r / m = (l / d12) × (kr / km);

[0081] Formula 7: kr / km=0.5+0.1x+0.005x2.

[0082] In the formula, ρ is the air density, C is the speed of sound in air, D is the cavity depth (depth of the silencing cavity 102), m is the relative acoustic mass, r is the relative acoustic resistance, w is the angular frequency, W = 2πff is the sound absorption frequency, t is the thickness of the first outer shell 11 of the micro-perforated plate, d1 is the aperture (diameter of the silencing hole 10), p is the perforation rate%, kr is the acoustic resistance coefficient, km is the acoustic mass coefficient, x = abf, a and b are constants, and l is a constant.

[0083] The angular bandwidth of sound absorption is approximately determined by r / m; the larger this value, the wider the sound absorption bandwidth.

[0084] Using the above formulas, parameters such as the diameter of the silencing hole 10, the thickness of the plate of the first outer shell 11, and the depth of the silencing cavity 102 can be obtained from the required r, m, and f.

[0085] In some examples, such as Figure 5 As shown, in the reference plane, let the radius of the sidewall of the first outer shell 11 be L1 and the radius of the sidewall of the second outer shell 13 be L2. Then, 1.05L1≤L2≤1.10L1. The radius L1 of the first outer shell 11 and the radius L2 of the second outer shell 13 affect the radial distance between the first outer shell 11 and the second outer shell 13, thereby affecting the cavity depth of the silencing cavity 102. The cavity depth, in turn, affects the resonant frequency of the silencing cavity 102. As can be seen from the principle of the micro-perforated plate silencer, the greater the cavity depth of the silencing cavity 102, the lower its resonant frequency. When the resonant frequency is the same as the noise frequency, the silencing cavity 102 can absorb noise, thereby reducing the noise of the ceiling fan.

[0086] If L2 is too small, the cavity depth of the silencing cavity 102 will be too small, resulting in an excessively high resonant frequency. Since the noise generated by the airflow driven by the impeller 2 is of low frequency, a small L2 will cause the resonant frequency of the silencing cavity 102 to differ significantly from the noise frequency, making it difficult for the silencing cavity 102 to absorb the noise generated by the airflow.

[0087] If L2 is too large, the volume of the second outer casing 13 will be too large, resulting in a larger ceiling fan, which in turn increases the manufacturing cost and weight of the ceiling fan.

[0088] like Figure 12As shown in the figure, this embodiment of the present disclosure conducted noise tests on ceiling fans with different L2 / L1 values ​​and obtained the corresponding noise values. When L2 / L1 was 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1, 1.11 and 1.12 respectively, the measured noise values ​​were 46dB, 45.9dB, 45.8dB, 45.6dB, 45.5dB, 45.4dB, 45.4dB, 45.4dB, and 45.4dB (e.g., ...). Figure 12 (As shown by the solid line in the image). Additionally, before installing the second housing 13, tests showed that the noise level generated by the ceiling fan was 46.2 dB (as shown by the solid line in the image). Figure 12 (As shown by the thick dashed line in the image). Therefore, providing a second housing 13 and a sound-absorbing hole 10 on the first housing 11 can reduce the noise generated by the ceiling fan.

[0089] from Figure 12 As can be seen, the noise generated by the ceiling fan gradually decreases as L2 gradually increases, meaning the noise reduction effect of the silencing cavity 102 gradually increases. Furthermore, when L2 ≥ 1.05L1, the noise reduction effect of the silencing cavity 102 significantly increases. When L2 ≥ 1.08L1, the noise generated by the ceiling fan almost stops decreasing as L2 increases, meaning the noise reduction effect of the silencing cavity 102 almost stops increasing. Moreover, when L2 ≥ 1.1L1, the volume of the second outer shell 13 becomes larger, resulting in a larger ceiling fan and increasing its weight. Therefore, setting L2 to 1.05L1 ≤ L2 ≤ 1.10L1 allows the silencing cavity 102 to have a good noise reduction effect while keeping the fan's volume and weight smaller.

[0090] In some examples, such as Figure 4 and Figure 5 As shown, to improve the air delivery effect of the ceiling fan, a shielding tongue 15 is provided on the inner side of the outer casing 103, and the shielding tongue 15 protrudes towards the inner casing 12. When the airflow flows in the air duct 101, it will flow through the shielding tongue 15. To further reduce the noise generated by the ceiling fan, noise reduction treatment can also be applied to the airflow flowing through the shielding tongue 15.

[0091] For example, a silencing cavity 102 is formed between the shielding tongue 15 and the outer shell 103, and the silencing hole 10 of the silencing cavity 102 is located on the shielding tongue 15. When the airflow flows through the shielding tongue 15, the sound waves generated by the airflow enter the silencing cavity 102 between the shielding tongue 15 and the outer shell 103 through the silencing hole 10 on the shielding tongue 15, causing the sound waves to rub against the silencing hole 10. During the friction process, the sound waves consume a large amount of sound energy, thereby reducing the noise generated by the airflow.

[0092] In some examples, the housing 103 may consist only of the first housing 11, with the shielding tongue 15 fixed to the inside of the first housing 11, and a sound-absorbing cavity 102 formed between the shielding tongue 15 and the sidewall of the first housing 11.

[0093] In other examples, the outer casing 103 includes a first outer casing 11 and a second outer casing 13. The shielding tongue 15 and the outer casing 11 are an integral structure, and the shielding tongue 15 can be regarded as a structure in which the side wall of the first outer casing 11 protrudes toward the inner casing 12. In this case, a sound-absorbing cavity 102 is formed between the shielding tongue 15 and the second outer casing 13.

[0094] The following is an exemplary description of how the air duct 101 surrounds the sound-absorbing cavity 102.

[0095] In some examples, such as Figure 3 and Figure 5 As shown, the housing assembly 1 includes an outer shell 103, an inner shell 12, and a silencer 14. The outer shell 103 surrounds the inner shell 12, forming an air duct 101 between the outer shell 103 and the inner shell 12. The top of the outer shell 103 has an opening 111 that surrounds the silencer 14, forming an annular air inlet between the opening 111 and the outer wall of the silencer 14. The silencer 14 has a silencing cavity 102 surrounding the axis of the opening 111, and silencing holes 10 on the silencing cavity 102 are located on the outer wall of the silencer 14 facing the opening 111.

[0096] like Figure 6 As shown, when the airflow enters the air duct 101 from the air inlet, it passes through the outer wall of the silencer 14. The sound waves generated by the airflow pass through the silencer hole 10 and enter the silencer cavity 102, causing the sound waves to rub against the silencer hole 10. During the friction process, a large amount of sound energy of the sound waves is consumed. In this way, the silencer 14 reduces the noise at the air inlet, thereby reducing the noise of the ceiling fan.

[0097] For example, such as Figure 7 As shown, the muffler 14 includes a first muffler plate 141 and a second muffler plate 142. The first muffler plate 141 and the second muffler plate 142 are annular, with the second muffler plate 142 surrounding the first muffler plate 141. An annular muffler cavity 102 is formed between the first muffler plate 141 and the second muffler plate 142, and a muffler hole 10 is located on the side wall of the second muffler plate 142.

[0098] In some examples, such as Figure 5 As shown, in the reference plane, let the radius of the opening 111 be R1, and the distance between the outer wall of the muffler 14 and the central axis of the opening 111 be R2, that is, the distance between the second muffler plate 142 and the central axis of the opening 111 be R2. Then 0.3R1≤R2≤0.5R1.

[0099] If R2 is too large, the outer wall of the silencer 14 (second silencer plate 142) may make the air inlet smaller, thus affecting the air intake of the ceiling fan, and consequently resulting in a smaller air output from the air outlet 112.

[0100] If R2 is too small, the cavity depth of the silencing cavity 102 may be too small, resulting in an excessively high resonance frequency of the silencing cavity 102. Moreover, the noise generated by the airflow driven by the impeller 2 is low-frequency noise, which will make it difficult for the silencing cavity 102 to reduce the noise generated by the airflow.

[0101] From the above relationship, it can also be deduced that R2 is directly proportional to R1. If R1 increases, it indicates that the opening 111 increases, that is, the air inlet is larger. According to aerodynamic principles, the larger the air inlet, the lower the airflow velocity and the lower the frequency of the generated sound waves. Therefore, the silencing cavity 102 should have a lower resonant frequency, so it is necessary to increase the cavity depth of the silencing cavity 102. Therefore, the cavity depth of the silencing cavity 102 can be increased by increasing the distance R2 between the axis of the second silencing plate 142 and the opening 111. Correspondingly, if R1 decreases, the sound wave frequency at the air inlet will increase, so it is necessary to decrease the cavity depth of the silencing cavity 102. Therefore, the distance R2 between the axis of the second silencing plate 142 and the opening 111 can be decreased.

[0102] like Figure 13 As shown in the embodiments of this disclosure, noise tests were conducted on ceiling fans with different values ​​of R2 / R1, and the corresponding noise values ​​were obtained. When R2 / R1 was 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, and 0.55, the measured noise values ​​were 46.1dB, 46dB, 45.8dB, 45.8dB, 45.59dB, 46dB, and 46.1dB, respectively (e.g., ...). Figure 13 (As shown by the solid line in the image). Additionally, before installing the second housing 13, tests showed that the noise level generated by the ceiling fan was 46.2 dB (as shown by the solid line in the image). Figure 13 (As shown by the thick dashed line in the image). Therefore, installing the silencer 14 can reduce the noise generated by the ceiling fan.

[0103] from Figure 13 As can be seen, with the increase of R2 / R1, the noise generated by the ceiling fan first decreases and then increases, that is, the noise reduction effect of the silencer 14 first increases and then decreases. Moreover, when 0.3R1≤R2≤0.5R1, the noise reduction effect of the silencer 14 is more obvious.

[0104] Furthermore, this embodiment of the disclosure also conducted noise tests on a ceiling fan after simultaneously installing a second housing 13 and a silencer 14 (taking L2 = 1.08L1 and R2 = 0.4R1 as an example). The test results show that the noise generated by the ceiling fan after simultaneously installing the second housing 13 and the silencer 14 is 45.2 dB. Therefore, it is evident that simultaneously installing the second housing 13 and the silencer 14 can further reduce the noise generated by the ceiling fan.

[0105] In some examples, such as Figure 5 As shown, on the reference plane, the distance between the first silencing plate 141 and the second silencing plate 142 is D, then 0.1R1≤D≤0.3R1. The reference plane is perpendicular to the central axis of the air inlet. The distance D between the first silencing plate 141 and the second silencing plate 142 is the depth of the silencing cavity 102. The greater the depth of the silencing cavity 102, the lower its resonant frequency.

[0106] If D is too small, the resonant frequency of the silencing cavity 102 will be too high, and the noise generated by the airflow will be low-frequency noise. This will cause the resonant frequency of the silencing cavity 102 to differ too much from the noise frequency, making it difficult for the silencing cavity 102 to reduce the noise generated by the airflow.

[0107] If D is too large, it can easily lead to an excessively large distance R2 between the axis of the second silencer plate 142 and the opening 111, resulting in a smaller air inlet and thus affecting the air intake of the ceiling fan.

[0108] From the above relationship, it can also be deduced that D is directly proportional to the radius R1 of the opening 111. According to aerodynamic principles, the larger the opening 111, the lower the airflow velocity and the lower the frequency of the generated sound waves. Therefore, the silencing cavity 102 should have a lower resonant frequency, thus requiring an increase in its depth. That is, increasing the distance between the first silencing plate 141 and the second silencing plate 142 by D. Conversely, if R1 decreases, the sound wave frequency at the opening 111 will increase, requiring a decrease in the depth of the silencing cavity 102. That is, decreasing the distance between the first silencing plate 141 and the second silencing plate 142 by D.

[0109] In some examples, such as Figure 3 and Figure 5 As shown, the wind turbine 2 includes a base plate 21 and multiple blades 22. The multiple blades 22 are fixed to the base plate 21 and arranged circumferentially, surrounding the silencer 14. This prevents the silencer 14 from affecting the air intake of the wind turbine 2. Figure 6As shown, when the airflow enters the interior of the blade 22, it passes through the outer wall of the silencer 14. The sound waves generated by the airflow pass through the silencer hole 10 and enter the silencer cavity 102, causing the sound waves to rub against the silencer hole 10. During the friction process, a large amount of sound energy of the sound waves is consumed. In this way, the silencer 14 reduces the noise at the air inlet, thereby reducing the noise of the ceiling fan.

[0110] In some examples, such as Figure 5 and Figure 7 As shown, the ceiling fan also includes a suspension bracket 4, through which the ceiling fan is fixed to the ceiling. The suspension bracket 4 is connected to the top of the housing 103, and the opening 111 surrounds the suspension bracket 4. The top of the silencer 14 is connected to the suspension bracket 4, thereby fixing the silencer 14 to the top of the ceiling fan.

[0111] In other examples, the silencer 14 may also be fixed to the base plate 21 of the impeller 2.

[0112] In some examples, such as Figures 5-8 As shown, the suspension bracket 4 has a mounting portion 41 and a receiving portion 42. The mounting portion 41 is used to mount the ceiling fan to the ceiling. The receiving portion 42 extends through the opening 111 between the outer casing 103 and the inner casing 12. The motor 3 is located in the receiving portion 42, and the silencer 14 surrounds the receiving portion 42. The silencer 14 surrounds the receiving portion 42. By placing the motor 3 in the receiving portion 42, the motor 3 can be prevented from affecting the airflow in the duct 101.

[0113] For example, such as Figure 7 and Figure 8 As shown, the suspension bracket 4 also includes a cover plate 43, and the receiving part 42 is connected to the cover plate 43. This prevents foreign objects in the airflow from entering the receiving part 42, thereby affecting the operation of the motor 3.

[0114] For example, such as Figure 3 As shown, in order to fix the suspension bracket 4 to the outer shell 103, the outer shell 103 has a mounting through hole 113, and the receiving part 42 extends through the mounting through hole 113 into the space between the outer shell 103 and the inner shell 12. The mounting through hole 113 and the side wall of the opening 111 are connected by a grid structure, which can prevent foreign objects from entering the interior of the impeller 2 from the opening 111.

[0115] In some examples, such as Figure 5As shown, let the height of the impeller 2 be H1, and the axial distance between the bottom of the silencer 14 and the top of the impeller 2 be H2. Then, 0.3H1≤H2≤0.5H1. The size of H2 affects the noise reduction of the silencer 14. If H2 is too small, the silencer 14 can only reduce the noise of the airflow near the top of the impeller 2, and it is difficult to reduce the noise of the airflow near the bottom of the impeller 2. If H2 is too large, it will occupy more of the internal space of the impeller 2, thus affecting the air intake of the impeller 2 and the air delivery effect of the ceiling fan.

[0116] In other examples, the motor 3 can also be fixed above the inner shell 12, that is, the motor 3 is fixed to the base plate 21 of the impeller 2, and the muffler 14 can also be fixed to the base plate 21, and the muffler 14 surrounds the motor 3.

[0117] The specific structural parameters of the first silencing plate 141, the second silencing plate 142, and the silencing cavity 102 can also be calculated according to Formula 1 to Formula 7.

[0118] In some examples, such as Figure 9 As shown, the first sound-absorbing plate 141 includes a first plate 1411, a second plate 1412, and a third plate 1413 connected in sequence. The first plate 1411 and the second plate 1412 are arranged in a bent manner, and the third plate 1413 is arranged in a bent manner with respect to the second plate 1412. The first plate 1411 and the third plate 1413 extend in opposite directions, and the first plate 1411 is connected to the suspension bracket 4.

[0119] The second silencing plate 142 includes a fourth plate 1421 and a fifth plate 1422. The fourth plate 1421 and the fifth plate 1422 are arranged in a bent manner. The silencing hole 10 is located in the fourth plate 1421. The top of the fourth plate 1421 is connected to the first plate 1411, and the bottom of the fourth plate 1421 is connected to the fifth plate 1422. The fifth plate 1422 is also connected to the third plate 1413.

[0120] It should be noted that the positional relationship between the muffler 14 and the motor 3 is not specifically limited in this embodiment. The muffler 14 and the motor 3 can both be fixed to the base plate 21 or both be fixed to the suspension bracket 4, with the muffler 14 surrounding the motor 3. Alternatively, one of the muffler 14 and the motor 3 can be fixed to the base plate, and the other can be fixed to the suspension bracket.

[0121] In some examples, such as Figure 5 As shown, the inner shell 12 has a silencing cavity 102, and the silencing holes 10 on the silencing cavity 102 are located on the side wall of the inner shell 12 facing the impeller 2. Figure 6As shown, when the airflow passes through the inner shell 12, the sound waves generated by the airflow enter the silencing cavity 102 of the inner shell 12 through the silencing hole 10, causing the sound waves to rub against the silencing hole 10. During the friction process, the sound waves lose a large amount of sound energy, thereby absorbing the noise generated by the airflow.

[0122] For example, the inner shell 12 may have a first shell and a second shell, the first shell is connected to the first outer shell 11, and the first shell is located between the first outer shell 11 and the second shell, so that a sound-absorbing cavity 102 is formed between the first shell and the second shell, and a sound-absorbing hole 10 is provided on the first shell.

[0123] In some examples, such as shown in 10, the sidewall of the inner shell 12 facing the impeller 2 includes a central portion 121 and an edge portion 122. The central portion 121 is recessed and faces the impeller 2, while the edge portion 122 surrounds the impeller 2, and a plurality of silencing holes 10 are located on the edge portion 122. The central portion 121 is used to avoid the output shaft of the motor 3.

[0124] The middle section 121 is blocked by the base plate 21 of the impeller 2, so the airflow will not flow through the middle section 121, and therefore there is no need to set the silencer hole 10 in the middle section 121. After the airflow leaves the trailing edge of the blade 22 of the impeller 2, it will flow through the edge section 122. The silencer hole 10 and the silencer cavity 102 on the edge section 122 can produce a noise reduction effect on the airflow, thereby reducing the noise of the ceiling fan.

[0125] Of course, in other examples, sound-absorbing holes 10 can also be provided in both the middle part 121 and the edge part 122.

[0126] It should be noted that the ceiling fan provided in this embodiment may have any one or more of the above-mentioned silencing cavity 102, and this embodiment does not specifically limit it.

[0127] In some examples, to further enhance the noise reduction effect of the silencing cavity 102, sound-absorbing cotton can be placed in any one or more of the aforementioned silencing cavities 102. After multiple collisions and reflections within the sound-absorbing cotton, the sound volume is reduced, thereby further reducing the noise of the ceiling fan.

[0128] This disclosure also provides a fan light, such as Figure 11 As shown, the fan light includes the aforementioned ceiling fan and light assembly 5, with the light assembly 5 disposed at the bottom of the housing assembly 1 of the ceiling fan.

[0129] In some examples, such as Figure 11 As shown, the inner shell 12 has a receiving groove. The lamp assembly 5 can directly place the lamp source in the receiving groove, in which case the inner shell 12 can be regarded as the mounting base of the lamp source. Alternatively, the lamp assembly 5 is a single component that is detachably connected to the bottom of the inner shell 12.

[0130] In some examples, such as Figure 11 As shown, the lamp assembly 5 has an LED (light emitting diode) lamp 51, which can be located at the bottom of the silencing cavity 102 between the first housing 11 and the second housing 13, and the bottom of the first housing 11 and the second housing 13 is at least partially transparent.

[0131] In some examples, such as Figure 5 As shown, the lamp assembly 5 is fixed to the bottom of the inner shell 12, forming a silencing cavity 102 between the lamp assembly 5 and the inner shell 12. The silencing holes 10 on the silencing cavity 102 are located within the inner shell 12. When the lamp assembly 5 is connected to the inner shell 12, a cavity is formed between them. By providing the silencing holes 10 on the inner shell 12, the silencing cavity 102 can be formed. In this way, a silencing cavity can be added inside the fan light without adding any additional fan light components. The silencing cavity 102 can silence the airflow passing through the inner shell 12, thereby reducing the noise of the fan light. The silencing principle of this silencing cavity 102 is the same as that described earlier and will not be repeated here.

[0132] The specific structural parameters of the inner shell 12, the lamp assembly 5, and the silencing cavity 102 can also be calculated according to Formula 1 to Formula 7.

[0133] In some examples, to further enhance the noise reduction effect of the silencing cavity 102, sound-absorbing cotton can be placed inside the silencing cavity 102. After multiple collisions and reflections in the sound-absorbing cotton, the sound volume will be reduced, thereby further reducing the noise of the ceiling fan.

[0134] 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 ceiling fan, characterized by, The ceiling fan comprises a housing assembly (1), a wind wheel (2) and a motor (3); The housing assembly (1) is provided with an air duct (101) and a sound absorbing cavity (102); The wind wheel (2) is located in the air duct (101), the motor (3) is in transmission connection with the wind wheel (2), and the motor (3) is used for driving the wind wheel (2) to rotate; The sound absorbing cavity (102) surrounds the air duct (101) or is surrounded by the air duct (101), and the cavity wall of the sound absorbing cavity (102) is provided with a plurality of sound absorbing holes (10) in communication with the air duct (101).

2. The ceiling fan of claim 1, wherein, The housing assembly (1) comprises an outer shell (103) and an inner shell (12); The outer shell (103) comprises a first outer shell (11) and a second outer shell (13), the first outer shell (11) surrounds the inner shell (12), and the first outer shell (11) and the inner shell (12) form the air duct (101); The second outer shell (13) surrounds the first outer shell (11), the second outer shell (13) and the first outer shell (11) form the sound absorbing cavity (102), and the sound absorbing holes (10) of the sound absorbing cavity (102) are located on the shell wall of the first outer shell (11).

3. The ceiling fan of claim 2, wherein, In a reference plane, the radius of the side wall of the first outer shell (11) is L1, the radius of the side wall of the second outer shell (13) is L2, and 1.05L1≤L2≤1.1L1, wherein the reference plane is perpendicular to the central axis of the wind wheel (2).

4. The ceiling fan of claim 1, wherein, The housing assembly (1) comprises an outer shell (103), an inner shell (12) and a plurality of shielding tongues (15); The outer shell (103) surrounds the inner shell (12), and the outer shell (103) and the inner shell (12) form the air duct (101); The plurality of shielding tongues (15) are arranged on the inner side of the outer shell (103), the shielding tongues (15) protrude towards the inner shell (12), the shielding tongues (15) and the outer shell (103) form the sound absorbing cavity (102), and the sound absorbing holes (10) of the sound absorbing cavity (102) are located on the shielding tongues (15).

5. The ceiling fan of claim 1, wherein, The housing assembly (1) comprises an outer shell (103), an inner shell (12) and a sound absorber (14); The outer shell (103) surrounds the inner shell (12), and the outer shell (103) and the inner shell (12) form the air duct (101), the top of the outer shell (103) is provided with an opening (111), the opening (111) surrounds the sound absorber (14), and the opening (111) and the outer wall of the sound absorber (14) form an annular air inlet; The sound absorber (14) has a sound absorbing cavity (102) surrounding the axis of the opening (111), and the sound absorbing holes (10) on the sound absorbing cavity (102) are located on the outer wall of the sound absorber (14) facing the opening (111).

6. The ceiling fan of claim 5, wherein, The sound absorber (14) comprises a first sound absorbing plate (141) and a second sound absorbing plate (142); The first sound-absorbing plate (141) and the second sound-absorbing plate (142) are annular, the second sound-absorbing plate (142) is sleeved on the first sound-absorbing plate (141), and the first sound-absorbing plate (141) and the second sound-absorbing plate (142) form the annular sound-absorbing cavity (102) between each other, and the sound-absorbing hole (10) is located on the side wall of the second sound-absorbing plate (142).

7. The ceiling fan of claim 5, wherein, In a reference plane, the radius of the opening (111) is R1, the distance between the outer wall of the sound absorber (14) and the central axis of the opening (111) is R2, and 0.3R1≤R2≤0.5R1, wherein the reference plane is perpendicular to the central axis of the opening (111).

8. The ceiling fan of claim 5, wherein, The wind wheel (2) comprises a bottom plate (21) and a plurality of blades (22); The plurality of blades (22) are fixed to the bottom plate (21) and arranged in a circumferential direction, and the plurality of blades (22) surround the sound absorber (14).

9. The ceiling fan of claim 5, wherein, The ceiling fan further comprises a suspension bracket (4); The suspension bracket (4) is connected to the top of the shell (103), the opening (111) surrounds the suspension bracket (4), and the top of the sound absorber (14) is connected to the suspension bracket (4).

10. The ceiling fan of claim 9, wherein, The suspension bracket (4) has a mounting portion (41) and a containing portion (42); The mounting portion (41) is used for mounting the ceiling fan to a ceiling; The containing portion (42) extends into the space between the shell (103) and the inner shell (12) through the opening (111), the motor (3) is located in the containing portion (42), and the sound absorber (14) surrounds the containing portion (42).

11. The ceiling fan of claim 10, wherein the housing is configured to be mounted to a ceiling surface. The height of the wind wheel (2) is H1, the axial distance between the bottom of the sound absorber (14) and the top of the wind wheel (2) is H2, and 0.3H1≤H2≤0.5H1.

12. The ceiling fan of claim 1, wherein, The shell assembly (1) comprises a shell (103) and an inner shell (12), the shell (103) surrounds the inner shell (12), and the shell (103) and the inner shell (12) form the air duct (101) therebetween; The inner shell (12) has the sound-absorbing cavity (102), and the sound-absorbing holes (10) on the sound-absorbing cavity (102) are located on the side wall of the inner shell (12) facing the wind wheel (2).

13. The ceiling fan of claim 12, wherein, The side wall of the inner shell (12) facing the wind wheel (2) comprises a middle portion (121) and an edge portion (122); The middle portion (121) is recessed and opposite to the wind wheel (2), the edge portion (122) surrounds the wind wheel (2), and the plurality of sound-absorbing holes (10) are located on the edge portion (122).

14. The ceiling fan of any one of claims 1-13, wherein, The diameter of the sound-absorbing hole (10) is 0.5mm-2mm.

15. A fan lamp characterized by, The fan lamp comprises the ceiling fan and a lamp assembly (5) according to any one of claims 1-11; The lamp assembly (5) is arranged at the bottom of the shell assembly (1) of the ceiling fan.

16. The fan lamp of claim 15, wherein, The shell assembly (1) comprises an outer shell (103) and an inner shell (12), the outer shell (103) is sleeved on the inner shell (12), and the wind channel (101) is formed between the outer shell (103) and the inner shell (12); The lamp assembly (5) is fixed to the bottom of the inner shell (12), the sound attenuation cavity (102) is formed between the lamp assembly (5) and the inner shell (12), and the sound attenuation hole (10) on the sound attenuation cavity (102) is located on the inner shell (12).

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