Noise reduction grille, method of using the same, fan assembly and air conditioner

Abstract

The present disclosure relates to a noise reduction grille, a method for using the same, a fan assembly and an air conditioner. The noise reduction grille comprises a grille body and a first plate body connected to the grille body, and the first plate body is provided with a first sound attenuation hole. In use, the first plate body is used to enclose a sound attenuation cavity, sound waves are transmitted into the sound attenuation cavity from the first sound attenuation hole, and sound pressure changes occur at the first sound attenuation hole, causing airflow vibration in the sound attenuation cavity. When the frequency of the sound waves is the same as the natural frequency of the sound attenuation cavity, the amplitude of the airflow vibration in the sound attenuation cavity reaches a maximum, strong resonance phenomenon occurs, thereby attenuating the energy of the sound waves and reducing the noise of the equipment with the noise reduction grille, i.e. the noise reduction grille has a noise reduction effect.

Description

Technical Field

[0001] This disclosure relates to the field of wind turbine technology, specifically to a noise reduction grille and its usage method, wind turbine components, and air conditioners. Background Technology

[0002] There are several unfavorable factors during the installation of outdoor units of air conditioners, such as limited installation space and louvers at the air outlet. Limited installation space results in less air intake space for the outdoor unit, and louvers at the air outlet affect the air output of the outdoor unit, ultimately leading to poor air intake and exhaust of the outdoor unit, higher fan noise, and negatively impacting the user experience. Summary of the Invention

[0003] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0004] In related technologies, the grille of a fan typically only serves a protective function, such as preventing users from accidentally sticking their fingers into the fan and getting scratched, or preventing debris such as leaves from entering the outdoor unit's air duct, and does not have a noise reduction function. By incorporating noise reduction structures into the grille, the noise of the fan can be effectively reduced, improving the user experience.

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a noise-reducing grille, which has a noise-reducing effect, reducing the noise of devices equipped with the grille.

[0006] The noise reduction grille disclosed herein includes a grille body and a first plate connected to the grille body, the first plate being provided with a first sound-absorbing hole.

[0007] Optionally, the noise reduction grille includes a surrounding panel, which is disposed on one side of the first plate body in the axial direction of the noise reduction grille and connected to the first plate body and the grille body. At least a portion of the surrounding panel is used to form a sound-absorbing cavity.

[0008] Optionally, at least one of the silencing chambers is a first silencing chamber; the noise reduction grille further includes a second plate, the second plate and the first plate are arranged axially spaced along the noise reduction grille and connected to the surrounding plate, the second plate, the surrounding plate and the first plate together forming the first silencing chamber.

[0009] Optionally, the second plate is disposed between the first plate and the grille body in the axial direction of the noise reduction grille; the second plate is movably connected to the enclosure along the axial direction of the noise reduction grille to adjust the volume of the first silencing cavity.

[0010] Optionally, the number of the silencing cavities is at least two, and at least one of the silencing cavities is a second silencing cavity; the silencing cavity formed between the second plate, the surrounding plate, and the first plate is a first silencing cavity; the noise reduction grille further includes a third plate, which is disposed on the side of the second plate away from the first plate in the axial direction of the noise reduction grille and is connected to the surrounding plate, the third plate, the surrounding plate, and the second plate form the second silencing cavity, and the third plate is provided with a second silencing hole communicating with the second silencing cavity.

[0011] Optionally, the grid body is annular, and the third plate is disposed inside the grid body and connected to the grid body.

[0012] Optionally, the first plate has a positioning protrusion that protrudes in the direction toward the second plate, and the positioning protrusion is used to abut against the second plate.

[0013] Optionally, the number of second silencing holes may be multiple, and at least a portion of the second silencing holes may have different or the same diameter; when at least a portion of the second silencing holes have different diameters, the second silencing hole with the larger diameter among at least two second silencing holes is located in the middle of the third plate, and the second silencing hole with the smaller diameter is located at the edge of the third plate.

[0014] Optionally, the perforation rate of the third plate is 10% to 35%.

[0015] Optionally, the natural frequency of the first silencing cavity is 200Hz to 900Hz; the equivalent radius of the first silencing hole is positively correlated with the natural frequency of the first silencing cavity, and the axial dimension of the first silencing hole in the noise reduction grille, the equivalent diameter of the first plate, and the axial dimension of the first silencing cavity in the noise reduction grille are negatively correlated with the natural frequency of the first silencing cavity.

[0016] Optionally, the equivalent radius of the first silencing hole is 2mm to 5mm.

[0017] Optionally, the first silencing hole has an axial dimension of 2mm to 4mm in the noise reduction grille; the equivalent diameter of the first plate is 140mm to 160mm; and the first silencing cavity has an axial dimension of 25mm to 35mm in the noise reduction grille.

[0018] Optionally, the natural frequency of the second silencing cavity is 200Hz to 900Hz; the equivalent radius of the second silencing hole is positively correlated with the natural frequency of the second silencing cavity, and the axial dimension of the second silencing hole in the noise reduction grid, the equivalent diameter of the third plate, and the axial dimension of the second silencing cavity in the noise reduction grid are negatively correlated with the natural frequency of the second silencing cavity.

[0019] Optionally, the equivalent radius of the second silencing hole is 5mm to 8mm.

[0020] Optionally, the second silencing hole has an axial dimension of 2.5mm to 5mm in the noise reduction grille; the equivalent diameter of the third plate has a diameter of 140mm to 160mm; and the second silencing cavity has an axial dimension of 25mm to 35mm in the noise reduction grille.

[0021] Optionally, the dimension of the first silencing cavity in the axial direction of the noise reduction grille is equal to the dimension of the second silencing cavity in the axial direction of the noise reduction grille.

[0022] Optionally, the noise reduction grille further includes a drive mechanism disposed within the second silencing cavity. The drive mechanism is tractively connected to the second plate to drive the second plate to move axially along the noise reduction grille.

[0023] Optionally, the grille body is provided with a wiring groove for the wiring harness of the drive mechanism to pass through.

[0024] Optionally, the grille body includes radial ribs and a plurality of annular ribs, the radial ribs extending radially along the noise reduction grille, the plurality of annular ribs being arranged at radial intervals along the noise reduction grille, the annular ribs being connected to the radial ribs, and the wiring grooves being disposed on the radial ribs.

[0025] Optionally, the enclosure is provided with wiring holes, which are connected to the wiring grooves.

[0026] Optionally, the noise reduction grille also includes a noise acquisition device, which is disposed outside the silencing cavity to collect noise outside the silencing cavity.

[0027] Optionally, the noise acquisition device is disposed on the outer wall of the silencing cavity.

[0028] Optionally, the number of the first silencing holes may be multiple, and at least a portion of the first silencing holes may have different or the same aperture; when at least a portion of the first silencing holes have different apertures, the first silencing hole with the larger aperture among at least two first silencing holes is located in the middle of the first plate, and the first silencing hole with the smaller aperture is located at the edge of the first plate.

[0029] Optionally, the perforation rate of the first plate is 30% to 60%.

[0030] The method of using the noise reduction grille disclosed herein includes:

[0031] The noise outside the silencing cavity is obtained when the second plate is in different preset positions;

[0032] When the noise outside the silencing cavity is minimized, the preset position of the second plate is the optimal position; control the second plate to move to the optimal position.

[0033] The wind turbine assembly disclosed herein includes a housing, a noise reduction grille, and a wind impeller. The noise reduction grille is any of the noise reduction grilles described above. The noise reduction grille is connected to the housing and forms a wind turbine cavity. The wind impeller is disposed within the wind turbine cavity.

[0034] Optionally, a sound-absorbing cavity is formed between the grille body, the first plate, the shell, and the impeller.

[0035] The air conditioner according to the embodiments of this disclosure includes the fan assembly described in any of the above claims.

[0036] In use, the noise-reducing grille disclosed herein forms a sound-absorbing cavity with a first plate. Sound waves enter the cavity through a first sound-absorbing hole, causing a change in sound pressure at the hole and resulting in airflow vibration within the cavity. When the frequency of the sound wave matches the natural frequency of the cavity, the airflow vibration amplitude reaches its maximum, producing a strong resonance phenomenon. This attenuates the energy of the sound wave and reduces the noise of the equipment equipped with the grille, thus achieving a noise reduction effect. Attached Figure Description

[0037] Figure 1 This is a front view of a noise reduction grille according to an embodiment of this disclosure.

[0038] Figure 2 Figure 1 AA view.

[0039] Figure 3 yes Figure 2 Enlarged view of point B in the middle.

[0040] Figure 4This is an exploded view of a noise-reducing grille according to an embodiment of this disclosure.

[0041] Figure 5 This is a front view of the first plate of a noise-reducing grille according to an embodiment of this disclosure.

[0042] Figure 6 yes Figure 5 The CC view.

[0043] Figure 7 This is a front view of the second plate of a noise-reducing grille according to an embodiment of this disclosure.

[0044] Figure 8 yes Figure 7 DD view.

[0045] Figure 9 This is a schematic diagram of the drive mechanism of a noise-reducing grille according to an embodiment of the present disclosure.

[0046] Figure 10 This is a schematic diagram of the structure of a noise acquisition device for a noise reduction grid according to an embodiment of the present disclosure.

[0047] Figure 11 This is a perspective view of the grille body of a noise-reducing grille according to an embodiment of the present disclosure.

[0048] Figure 12 yes Figure 11 Enlarged view of point E in the middle.

[0049] Figure 13 This is a front view of the grille body of a noise reduction grille according to an embodiment of this disclosure.

[0050] Figure 14 This is a perspective view of a noise-reducing grille according to another embodiment of the present disclosure.

[0051] Figure 15 This is a flowchart illustrating a method of using a noise-reducing grille according to an embodiment of this disclosure.

[0052] Figure 16 This is a cross-sectional view of a wind turbine assembly according to an embodiment of this disclosure.

[0053] Figure label:

[0054] 100. Noise-reducing grille;

[0055] 10. Grille body;

[0056] 1. First plate; 11. First silencing hole; 12. First silencing cavity; 13. Positioning protrusion; 131. Positioning groove;

[0057] 2. Enclosure panel; 21. Cable routing holes;

[0058] 3. Second plate; 31. Threaded hole;

[0059] 4. Third plate; 41. Second silencing hole; 42. Second silencing cavity;

[0060] 5. Ribs; 51. Channels; 52. Radial ribs; 521. Cable trays; 53. Circular ribs;

[0061] 6. Drive mechanism; 61. Screw; 62. Drive component; 621. Limiting part;

[0062] 7. Noise acquisition device;

[0063] 8. Wire harness; 81. First wire harness; 82. Second wire harness;

[0064] 20. Shell;

[0065] 30. Wind turbine;

[0066] 40. Silencing cavity. Detailed Implementation

[0067] Embodiments of this disclosure are described in detail below, with examples of these embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting it.

[0068] like Figures 1 to 4 , Figure 14 As shown, the noise reduction grille 100 of this embodiment includes a grille body 10 and a first plate 1 connected to the grille body 10. The first plate 1 is provided with a first sound-absorbing hole 11.

[0069] The first plate 1 is used to form a sound-absorbing cavity 40, which is connected to the first sound-absorbing hole 11. For example, the first plate 1, together with the grille body 10 and the rest of the noise-reducing grille 100, forms the sound-absorbing cavity 40; or, the first plate 1, the rest of the noise-reducing grille 100, and other components form the sound-absorbing cavity 40; or, the first plate 1 and other components (such as a fan) form the sound-absorbing cavity 40.

[0070] In use, the noise reduction grille 100 of this embodiment forms a sound-absorbing cavity 40 with a first plate 1. Sound waves enter the sound-absorbing cavity 40 through the first sound-absorbing hole 11, causing a change in sound pressure at the first sound-absorbing hole 11, which in turn causes the airflow within the sound-absorbing cavity 40 to vibrate. When the frequency of the sound wave is the same as the natural frequency of the sound-absorbing cavity 40, the vibration amplitude of the airflow within the sound-absorbing cavity 40 reaches its maximum, producing a strong resonance phenomenon. This attenuates the energy of the sound wave and reduces the noise of equipment (such as a fan) equipped with the noise reduction grille 100, thus achieving a noise reduction effect.

[0071] Optionally, such as Figures 1 to 4 As shown, the axis of the noise reduction grille 100 passes through the silencing cavity 40.

[0072] Understandably, when the noise reduction grille 100 is in use, its axis usually coincides with the axis of rotation of rotating components. For example, when the noise reduction grille 100 is used in a fan, its axis coincides with the axis of the fan hub, resulting in higher noise at the axis of the noise reduction grille 100. Effectively reducing the noise at the axis of the noise reduction grille 100 would improve its noise reduction effect.

[0073] By setting the axis of the noise reduction grille 100 to pass through the silencing cavity 40, sound waves near the axis of the noise reduction grille 100 can effectively enter the silencing cavity 40, thereby effectively reducing the noise of the device with the noise reduction grille 100.

[0074] Preferably, the axis of the noise reduction grille 100 coincides with the center line of the sound-absorbing cavity 40.

[0075] Optionally, such as Figures 2 to 4 As shown, the noise reduction grille 100 includes a surrounding plate 2, which is disposed on one side of the first plate 1 in the axial direction of the noise reduction grille 100 and is connected to the first plate 1 and the grille body 10. At least a portion of the surrounding plate 2 is used to form a sound-absorbing cavity 40.

[0076] The resonant frequency f of the silencing cavity 40 satisfies the following formula:

[0077]

[0078] Where c is the speed of sound, A is the cross-sectional area of ​​the first silencing hole 11, L is the length of the first silencing hole 11, and V is the volume of the silencing cavity 40.

[0079] By setting the enclosure 2, the volume of the silencing cavity 40 can be increased. According to the formula satisfied by the resonant frequency f of the silencing cavity 40, by increasing the volume of the silencing cavity 40, the natural frequency of the silencing cavity 40 can be reduced, so that the silencing cavity 40 can attenuate the energy of lower frequency sound waves and improve the noise reduction effect of the noise reduction grille 100 on low frequency noise.

[0080] Optionally, such as Figures 2 to 4 As shown, at least one silencing cavity 40 is a first silencing cavity 12. The noise reduction grille 100 also includes a second plate 3, which is disposed on the side of the surrounding plate 2 away from the first plate 1 in the axial direction of the noise reduction grille 100 and is connected to the surrounding plate 2. The second plate 3, the surrounding plate 2 and the first plate 1 together form the first silencing cavity 12.

[0081] By setting the second plate 3, the noise reduction grille 100 itself forms a sound-absorbing cavity 40, and the noise reduction grille 100 does not need to cooperate with other components to form the first sound-absorbing cavity 12. Therefore, on the one hand, during the installation of the noise reduction grille 100, the sealing requirements between the noise reduction grille 100 and other components can be reduced, facilitating the installation and fixing of the noise reduction grille 100; on the other hand, the size of the first sound-absorbing cavity 12 can be designed according to needs, so as to utilize the first sound-absorbing cavity 12 to attenuate the energy of sound waves of specific frequencies, thereby improving the noise reduction effect of the noise reduction grille 100.

[0082] To make the technical solution of this disclosure easier to understand, the following description further illustrates the technical solution of this disclosure, taking the example that the axial direction of the noise reduction grille 100 is consistent with the front-rear direction. Wherein, the front-rear direction is as follows... Figures 2 to 4 As shown.

[0083] Optionally, such as Figure 3 As shown, the second plate 3 is disposed between the first plate 1 and the grille body 10 in the axial direction of the noise reduction grille 100.

[0084] For example, such as Figure 3 As shown, the second plate 3 is located on the rear side of the first plate 1, and the first silencing hole 11 is located on the rear side of the first silencing cavity 12. Figure 2 As shown, the air outlet direction of the noise reduction grille 100 is... Figure 2 The arrows point in the same direction, indicating that the air outlet of the noise-reducing grille 100 faces forward. This allows the airflow to directly enter the first silencing cavity 12 through the first silencing hole 11 as it flows from back to front through the grille body 10. This further improves the noise reduction effect of the noise-reducing grille 100.

[0085] Optionally, the second plate 3 is movably connected to the enclosure 2 along the axial direction of the noise reduction grille 100 to adjust the volume of the first silencing cavity 12.

[0086] For example, the second plate 3 is movably connected to the surrounding plate 2 in the front-back direction.

[0087] By movably connecting the second plate 3 to the enclosure 2 along the axial direction of the noise reduction grille 100, the volume of the first silencing cavity 12 can be adjusted by moving the second plate 3 along the axial direction of the noise reduction grille 100. From the formula satisfied by the resonant frequency f of the first silencing cavity 12, it can be seen that by adjusting the volume of the first silencing cavity 12, the natural frequency of the first silencing cavity 12 can be adjusted, allowing the first silencing cavity 12 to attenuate the energy of sound waves of different frequencies, thereby improving the noise reduction effect of the noise reduction grille 100.

[0088] Optionally, the number of silencing cavities 40 is at least two, and at least one silencing cavity 40 is a second silencing cavity 42. For example... Figure 3 and Figure 4As shown, the noise reduction grille 100 also includes a third plate 4, which is disposed on the side of the second plate 3 away from the first plate 1 in the axial direction of the noise reduction grille 100 and is connected to the surrounding plate 2. The third plate 4, the surrounding plate 2 and the second plate 3 form a second silencing cavity 42, and the third plate 4 is provided with a second silencing hole 41 communicating with the second silencing cavity 42.

[0089] For example, such as Figure 2 and Figure 3 As shown, the enclosure 2 is located on the front side of the first plate 1, the second plate 3 is located on the front side of the first plate 1, and the third plate 4 is located on the front side of the second plate 3. The front surface of the first plate 1, the inner side of the enclosure 2, and the rear surface of the second plate 3 form a first silencing cavity 12. The front surface of the second plate 3, the inner side of the enclosure 2, and the rear surface of the third plate 4 form a second silencing cavity 42.

[0090] By setting the third plate 4, the noise reduction grille 100 forms a first silencing cavity 12 and a second silencing cavity 42, thereby improving the noise reduction effect of the noise reduction grille 100.

[0091] In addition, the parameters of the first silencing cavity 12 and the second silencing cavity 42 can be set to be different, so that the first silencing cavity 12 and the second silencing cavity 42 can reduce noise at different frequencies and improve the noise reduction effect of the noise reduction grille 100.

[0092] The first silencing cavity 12 is located in front of the second silencing cavity 42 in the air outlet direction of the noise reduction grille 100. That is, the first silencing cavity 12 is located on the windward side of the noise reduction grille 100 and is used to achieve inlet flow silencing; the second silencing cavity 42 is located on the outlet side of the noise reduction grille 100 and is used to achieve outlet flow silencing.

[0093] Optionally, such as Figure 4 As shown, the grille body 10 is annular, and the third plate 4 is disposed on the inner side of the grille body 10 and connected to the grille body 10.

[0094] The grille body 10 and the third plate 4 can be integrally formed.

[0095] By setting the grille body 10 as an annular shape and setting the third plate 4 inside the grille body 10, the structure of the noise reduction grille 100 can be simplified, making the processing and manufacturing of the noise reduction grille 100 more convenient.

[0096] Optionally, such as Figure 3 and Figure 6 As shown, the first plate 1 is provided with a positioning protrusion 13 protruding in the direction toward the second plate 3, and the positioning protrusion 13 is used to stop against the second plate 3.

[0097] Among them, the positioning protrusion 13 can be a structure such as a protrusion or a convex hull.

[0098] By providing a positioning protrusion 13 on the first plate 1, when the positioning protrusion 13 abuts against the second plate 3 during the movement of the second plate 3, the second plate 3 cannot continue to move towards the first plate 1. Thus, the positioning protrusion 13 restricts the movement range of the second plate 3, ensuring a gap between the second plate 3 and the first plate 1. This guarantees that the minimum volume of the first silencing cavity 12 is greater than zero, ensuring that the first silencing cavity 12 can be used to attenuate the energy of sound waves and reduce the noise of the device equipped with the noise reduction grille 100.

[0099] Optionally, such as Figures 1 to 5 As shown, there are multiple first silencing holes 11, and at least some of the first silencing holes 11 have different or the same hole diameter.

[0100] It is understandable that the resonant frequency f of the whole formed by each first silencing hole 11 and the first silencing cavity 12 satisfies the above formula. When the aperture of the first silencing hole 11 is different, the cross-sectional area of ​​the first silencing hole 11 is different. However, for the first silencing cavity 12, the sound velocity C, the length L of the first silencing hole 11, and the volume V of the first silencing cavity 12 are all the same for each first silencing hole 11.

[0101] As can be seen from the above formula for the resonant frequency f, when the apertures of the first silencing holes 11 are the same, the resonant frequencies corresponding to the multiple first silencing holes 11 are the same, and the multiple first silencing holes 11 are all used to attenuate the energy of sound waves of the same frequency; when the apertures of the first silencing holes 11 are different, the resonant frequencies corresponding to the multiple first silencing holes 11 are different, and the multiple first silencing holes 11 are used to attenuate the energy of sound waves of different frequencies.

[0102] Therefore, by setting the number of first noise reduction holes 11 to multiple, the hole diameters of the first noise reduction holes 11 can be set to be the same or different as needed, so as to effectively improve the noise reduction effect of the noise reduction grille 100.

[0103] Optionally, when the diameters of the first silencing holes 11 are different, the first silencing hole 11 with a larger diameter is located in the middle of the first plate 1, and the first silencing hole 11 with a smaller diameter is located at the edge of the first plate 1. That is, the diameter of the first silencing hole 11 located on the inner side is larger than the diameter of the first silencing hole 11 located on the outer side.

[0104] In this context, "inward" refers to the side closest to the axis of the first plate 1; "outward" refers to the side closest to the outer surface of the first plate 1.

[0105] By placing the larger first silencing hole 11 in the middle of the first plate 1 and the smaller first silencing hole 11 at the edge of the first plate 1, it is beneficial to improve the structural strength of the first plate 1 when the diameters of at least two first silencing holes 11 are different.

[0106] The shape of the first silencing hole 11 can be circular, rectangular, or elliptical. Multiple first silencing holes 11 can be evenly distributed or non-uniformly distributed.

[0107] Optionally, the perforation rate of the first plate 1 is 30% to 60%.

[0108] The perforation rate refers to the ratio of the sum of the perforated areas to the total area of ​​the board. For example, if the first board 1 has four first silencing holes 11, the perforation rate of the first board 1 is the ratio of the sum of the cross-sectional areas of the four first silencing holes 11 to the area of ​​the first board 1.

[0109] It is understandable that the greater the perforation rate of the first plate 1, the better the attenuation effect of the first silencing cavity 12 on sound waves, and the better the noise reduction effect of the noise reduction grille 100. However, the structural strength of the first plate 1 is worse. Conversely, the smaller the perforation rate of the first plate 1, the better the structural strength of the first plate 1. However, the worse the attenuation effect of the first silencing cavity 12 on sound waves, and the worse the noise reduction effect of the noise reduction grille 100 is.

[0110] By setting the perforation rate of the first plate 1 to 30% to 60%, the noise reduction effect of the noise reduction grid 100 can be guaranteed while ensuring the structural strength of the first plate 1.

[0111] Optionally, the natural frequency of the silencing cavity 40 is 200Hz to 900Hz. The equivalent radius of the first silencing hole 11 is positively correlated with the natural frequency of the first silencing cavity 12. The axial dimension of the first silencing hole 11 in the noise reduction grille 100, the equivalent diameter of the first plate 1, and the axial dimension of the first silencing cavity 12 in the noise reduction grille 100 are negatively correlated with the natural frequency of the first silencing cavity 12.

[0112] By setting the natural frequency of the first silencing cavity 12 to 200Hz to 900Hz, the energy of sound waves with a frequency of 200Hz to 900Hz can be attenuated by the first silencing cavity 12, thereby effectively improving the noise reduction effect of the noise reduction grille 100.

[0113] Optionally, such as Figure 3 , Figure 5 and Figure 6 As shown, the equivalent radius R1 of the first silencing hole 11 is 2mm to 5mm.

[0114] Since the equivalent radius of the first silencing hole 11 is positively correlated with the natural frequency of the silencing cavity 40, the larger the equivalent radius of the first silencing hole 11, the higher the natural frequency of the silencing cavity 40. The silencing cavity 40 can attenuate the energy of higher frequency sound waves, so that the noise reduction grille 100 has a noise reduction effect on higher frequency noise. The smaller the equivalent radius of the first silencing hole 11, the lower the natural frequency of the silencing cavity 40. The silencing cavity 40 can attenuate the energy of lower frequency sound waves, so that the noise reduction grille 100 has a noise reduction effect on lower frequency noise.

[0115] By setting the equivalent radius of the first silencing hole 11 to 2mm to 5mm, the natural frequency of the first silencing cavity 12 can be maintained at 200Hz to 900Hz, effectively improving the noise reduction effect of the noise reduction grille 100.

[0116] Optionally, such as Figure 3 and Figure 6 As shown, the dimension L1 of the first silencing hole 11 in the axial direction of the noise reduction grille 100 is 2mm to 4mm.

[0117] For example, the first silencing hole 11 has a dimension of 2.5mm in the axial direction of the noise reduction grille 100. That is, the first plate 1 has a dimension of 2.5mm in the axial direction of the noise reduction grille 100.

[0118] Optionally, the equivalent diameter D1 of the first plate 1 is 140mm to 160mm.

[0119] Optionally, the dimension H1 of the first silencing cavity 12 in the axial direction of the noise reduction grille 100 is 25mm to 35mm.

[0120] For example, the first silencing cavity 12 has a dimension of 30 mm in the axial direction of the noise reduction grille 100.

[0121] Since the axial dimension of the first silencing hole 11 in the noise reduction grille 100 is negatively correlated with the natural frequency of the silencing cavity 40, the equivalent diameter of the first plate 1 is negatively correlated with the natural frequency of the silencing cavity 40, and the axial dimension of the first silencing cavity 12 in the noise reduction grille 100 is negatively correlated with the natural frequency of the silencing cavity 40, therefore, the smaller the axial dimension of the first silencing hole 11 in the noise reduction grille 100, the smaller the equivalent diameter of the first plate 1, and the smaller the axial dimension of the first silencing cavity 12 in the noise reduction grille 100, the more effective the silencing cavity 40 will be. The higher the natural frequency of the sound-absorbing cavity 40, the more energy the sound-absorbing cavity 40 can attenuate, thus enabling the noise-reducing grille 100 to reduce noise at higher frequencies. The larger the axial dimension of the first sound-absorbing hole 11 in the noise-reducing grille 100, the larger the equivalent diameter of the first plate 1, and the larger the axial dimension of the first sound-absorbing cavity 12 in the noise-reducing grille 100, the lower the natural frequency of the sound-absorbing cavity 40. The sound-absorbing cavity 40 can attenuate the energy of the sound-absorbing cavity 40, thus enabling the noise-reducing grille 100 to reduce noise at lower frequencies.

[0122] By setting the dimension of the first silencing hole 11 in the axial direction of the noise reduction grille 100 to 2mm to 4mm, setting the equivalent diameter of the first plate 1 to 140mm to 160mm, and setting the dimension of the first silencing cavity 12 in the axial direction of the noise reduction grille 100 to 25mm to 35mm, the natural frequency of the silencing cavity 40 can be maintained at 200Hz to 900Hz, effectively improving the noise reduction effect of the noise reduction grille 100.

[0123] Optionally, there may be multiple second silencing holes 41, and at least some of the second silencing holes 41 may have different or the same diameter.

[0124] It is understandable that the resonant frequency f of the entire system composed of each second silencing hole 41 and the second silencing cavity 42 satisfies the above formula. When the diameter of the second silencing hole 41 is different, the cross-sectional area of ​​the second silencing hole 41 is different. However, for the second silencing cavity 42, the sound velocity C, the length L of the second silencing hole 41, and the volume V of the second silencing cavity 42 are all the same for each second silencing hole 41.

[0125] As can be seen from the above formula for the resonant frequency f, when the apertures of the second silencing holes 41 are the same, the resonant frequencies corresponding to the multiple second silencing holes 41 are the same, and the multiple second silencing holes 41 are all used to attenuate the energy of sound waves of the same frequency; when the apertures of the second silencing holes 41 are different, the resonant frequencies corresponding to the multiple second silencing holes 41 are different, and the multiple second silencing holes 41 are used to attenuate the energy of sound waves of different frequencies.

[0126] Therefore, by setting the number of second noise reduction holes 41 to multiple, the diameter of the second noise reduction holes 41 can be set to be the same or different as needed, so as to effectively improve the noise reduction effect of the noise reduction grille 100.

[0127] Optionally, when the diameters of the second silencing holes 41 are different, the second silencing hole 41 with a larger diameter is located in the middle of the third plate 4, and the first silencing hole 11 with a smaller diameter is located at the edge of the third plate 4. That is, the diameter of the second silencing hole 41 located on the inner side is larger than the diameter of the second silencing hole 41 located on the outer side.

[0128] "Inward" refers to the side closest to the axis of the third plate 4; "outward" refers to the side closest to the outer surface of the third plate 4.

[0129] By placing the larger second silencing hole 41 in the middle of the third plate 4 and the smaller first silencing hole 11 at the edge of the third plate 4, it is beneficial to improve the structural strength of the third plate 4 when the diameters of at least two second silencing holes 41 are different.

[0130] The shape of the second silencing hole 41 can be circular, rectangular, or elliptical, etc. Multiple second silencing holes 41 can be evenly distributed or non-uniformly distributed.

[0131] Optionally, the perforation rate of the third plate 4 is 10% to 35%.

[0132] For example, the third plate 4 has four second silencing holes 41, and the perforation rate of the third plate 4 is the ratio of the sum of the cross-sectional areas of the four second silencing holes 41 to the area of ​​the third plate 4.

[0133] It is understandable that the greater the perforation rate of the third plate 4, the better the attenuation effect of the second silencing cavity 42 on sound waves, and the better the noise reduction effect of the noise reduction grille 100. However, the structural strength of the third plate 4 is worse. Conversely, the smaller the perforation rate of the third plate 4, the better the structural strength of the third plate 4. However, the worse the attenuation effect of the second silencing cavity 42 on sound waves, and the worse the noise reduction effect of the noise reduction grille 100 is.

[0134] By setting the perforation rate of the third plate 4 to 10% to 35%, the noise reduction effect of the noise reduction grille 100 can be guaranteed while ensuring the structural strength of the third plate 4.

[0135] Optionally, the second silencing hole 41 can be circular, rectangular, or elliptical in shape.

[0136] Optionally, the natural frequency of the second silencing cavity 42 is 200Hz to 900Hz. The equivalent radius of the second silencing hole 41 is positively correlated with the natural frequency of the second silencing cavity 42, while the axial dimension of the second silencing hole 41 in the noise reduction grille 100, the equivalent diameter of the third plate 4, and the axial dimension of the second silencing cavity 42 in the noise reduction grille 100 are negatively correlated with the natural frequency of the second silencing cavity 42.

[0137] By setting the natural frequency of the second silencing cavity 42 to 200Hz to 900Hz, the energy of sound waves with a frequency of 200Hz to 900Hz can be attenuated by the second silencing cavity 42, thereby effectively improving the noise reduction effect of the noise reduction grille 100.

[0138] Optionally, such as Figure 13 As shown, the equivalent radius R2 of the second silencing hole 41 is 5mm to 8mm.

[0139] Since the equivalent radius of the second silencing hole 41 is positively correlated with the natural frequency of the second silencing cavity 42, the larger the equivalent radius of the second silencing hole 41, the higher the natural frequency of the second silencing cavity 42. The second silencing cavity 42 can attenuate the energy of higher frequency sound waves, so that the noise reduction grille 100 has a noise reduction effect on higher frequency noise. The smaller the equivalent radius of the second silencing hole 41, the lower the natural frequency of the second silencing cavity 42. The second silencing cavity 42 can attenuate the energy of lower frequency sound waves, so that the noise reduction grille 100 has a noise reduction effect on lower frequency noise.

[0140] By setting the equivalent radius of the second silencing hole 41 to 5mm to 8mm, the natural frequency of the second silencing cavity 42 can be maintained at 200Hz to 900Hz, effectively improving the noise reduction effect of the noise reduction grille 100.

[0141] Optionally, such as Figure 3 As shown, the dimension L2 of the second silencing hole 41 in the axial direction of the noise reduction grille 100 is 2.5mm to 5mm. That is to say, the dimension of the third plate 4 in the axial direction of the noise reduction grille 100 is 2.5mm to 5mm.

[0142] For example, the second silencing hole 41 has a dimension of 3mm in the axial direction of the noise reduction grille 100.

[0143] Optionally, such as Figure 13 As shown, the equivalent diameter D2 of the third plate 4 is 140mm to 160mm.

[0144] Optionally, the dimension H2 of the second silencing cavity 42 in the axial direction of the noise reduction grille 100 is 25mm to 35mm.

[0145] For example, the second silencing cavity 42 has a dimension of 30 mm in the axial direction of the noise reduction grille 100.

[0146] Since the axial dimension of the second silencing hole 41 in the noise reduction grille 100 is negatively correlated with the natural frequency of the second silencing cavity 42, the equivalent diameter of the first plate 1 is negatively correlated with the natural frequency of the second silencing cavity 42, and the axial dimension of the second silencing cavity 42 in the noise reduction grille 100 is also negatively correlated with its natural frequency, the smaller the axial dimension of the second silencing hole 41 in the noise reduction grille 100, the higher the natural frequency of the second silencing cavity 42; and the smaller the equivalent diameter of the first plate 1, the smaller the axial dimension of the second silencing cavity 42 in the noise reduction grille 100. If the natural frequency of the second silencing cavity 42 is larger, the second silencing cavity 42 can attenuate the energy of higher frequency sound waves, so that the noise reduction grille 100 has a noise reduction effect on higher frequency noise; if the size of the second silencing hole 41 in the axial direction of the noise reduction grille 100 is larger, the equivalent diameter of the first plate 1 is larger, and the size of the second silencing cavity 42 in the axial direction of the noise reduction grille 100 is larger, then the natural frequency of the second silencing cavity 42 is smaller, and the second silencing cavity 42 can attenuate the energy of lower frequency sound waves, so that the noise reduction grille 100 has a noise reduction effect on lower frequency noise.

[0147] By setting the axial dimension L2 of the second silencing hole 41 in the noise reduction grille 100 to 2.5mm-5mm, the equivalent diameter D2 of the third plate 4 to 140mm-160mm, and the axial dimension of the second silencing cavity 42 in the noise reduction grille 100 to 25mm-35mm, the natural frequency of the second silencing cavity 42 can be maintained between 200Hz and 900Hz, effectively improving the noise reduction effect of the noise reduction grille 100. Optionally, the axial dimension H1 of the second silencing cavity 42 in the noise reduction grille 100 is equal to the axial dimension H2 of the second silencing cavity 42 in the noise reduction grille 100.

[0148] Optionally, such as Figure 3 As shown, the dimension L3 of the second plate 3 in the axial direction of the noise reduction grille 100 is 2.5mm to 4mm.

[0149] For example, L3 is 3mm.

[0150] It is understandable that the larger the axial dimension of the second plate 3 in the noise reduction grille 100 and the greater the thickness of the second plate 3, the better the structural strength of the second plate 3. However, when the volumes of the first silencing cavity 12 and the second silencing cavity 42 are constant, the larger the axial dimension of the noise reduction grille 100, the smaller the axial dimension of the second plate 3 in the noise reduction grille 100, and the smaller the axial dimension of the noise reduction grille 100, when the volumes of the first silencing cavity 12 and the second silencing cavity 42 are constant. However, the smaller the thickness of the second plate 3, the worse the structural strength of the second plate 3.

[0151] By setting the axial dimension of the second plate 3 in the noise reduction grille 100 to 2.5mm to 4mm, the axial dimension of the noise reduction grille 100 can be effectively reduced while ensuring the structural strength of the second plate 3, thus reducing the space occupied by the noise reduction grille 100.

[0152] Optionally, such as Figure 2 and Figure 4 As shown, the noise reduction grille 100 also includes a drive mechanism 6, which is disposed in the second silencing cavity 42. The drive mechanism 6 is connected to the second plate 3 in a transmission manner to drive the second plate 3 to move along the axial direction of the noise reduction grille 100.

[0153] By setting the drive mechanism 6, the second plate 3 can be moved automatically, thereby facilitating the control of the position of the second plate 3 and improving the practicality of the noise reduction grille 100.

[0154] Optionally, such as Figure 3 , Figure 4 , Figure 8 and Figure 9 As shown, the drive mechanism 6 includes a screw 61 and a drive member 62. The second plate 3 is provided with a threaded hole 31. The screw 61 is threadedly engaged with the threaded hole 31. The drive member 62 is connected to the screw 61 to drive the screw 61 to rotate.

[0155] The driving component 62 can be a drive motor. When the second plate 3 needs to be moved, the drive motor drives the screw 61 to rotate. The threaded hole 31 and the screw 61 are threaded together to form a screw-nut mechanism, thereby driving the second plate 3 to move axially along the noise reduction grille 100. The driving component 62 can be fixed to the third plate 4 by screws, clips, etc.

[0156] By setting the drive mechanism 6 in the above form, not only can the movement stability of the second plate 3 be improved and the reliability of the noise reduction grille 100 be improved, but the movement distance of the second plate 3 can also be easily controlled.

[0157] Optionally, such as Figure 3 and Figure 6 As shown, the first plate 1 is provided with a positioning groove 131 with the opening facing the third plate 4, and the end of the screw 61 facing the first plate 1 is inserted into the positioning groove 131.

[0158] For example, such as Figure 3 and Figure 6 As shown, the positioning groove 131 is provided on the positioning protrusion 13.

[0159] By inserting the end of the screw 61 facing the first plate 1 into the positioning groove 131 of the first plate 1, the position of that end of the screw 61 can be determined, preventing the screw 61 from deflecting and improving the reliability of the noise reduction grille 100.

[0160] Optionally, such as Figure 3 and Figure 9 As shown, the driving member 62 is provided with a limiting part 621, which is used to stop the third plate 4 from the side facing the second plate 3.

[0161] For example, a limiting portion 621 is formed on the end face of the drive member 62 facing the second plate 3.

[0162] By providing a limiting part 621 on the driving member 62, when the limiting part 621 stops against the second plate 3 during the movement of the second plate 3, the second plate 3 cannot continue to move towards the third plate 4. Thus, the limiting part 621 can limit the movement range of the second plate 3, ensuring a large gap between the second plate 3 and the third plate 4. This ensures that the minimum volume of the second silencing cavity 42 is not too small, and that the second silencing cavity 42 can be used to attenuate the energy of sound waves, reducing the noise of the device equipped with the noise reduction grille 100.

[0163] Optionally, such as Figure 3 and Figure 4 As shown, the noise reduction grille 100 also includes a noise acquisition device 7, which is located outside the silencing cavity 40 to collect noise from outside the silencing cavity 40.

[0164] For example, the noise acquisition device 7 includes a noise sensor for detecting and acquiring noise outside the silencing cavity 40.

[0165] By setting up the noise acquisition device 7, the noise outside the silencing cavity 40 can be acquired, making it easy to obtain the noise level outside the silencing cavity 40. Furthermore, it allows users to easily adjust the position of the third plate 4 as needed, so that the noise outside the silencing cavity 40 is lower.

[0166] Optionally, such as Figure 3 and Figure 4 As shown, the noise acquisition device 7 is installed on the outer wall of the silencing cavity 40.

[0167] For example, such as Figure 4 As shown, the noise acquisition device 7 is installed on the outer side of the enclosure 2.

[0168] By placing the noise acquisition device 7 on the outer wall of the silencing cavity 40, the accuracy of the acquired noise can be improved.

[0169] Optionally, such as Figure 4 , Figure 12 and Figure 13 As shown, the grille body 10 is provided with a wiring groove 521, through which the wiring harness 8 of the drive mechanism 6 passes.

[0170] For example, the wiring duct 521 provides passage for the first wiring harness 81 connected to the drive mechanism 6 and the second wiring harness 82 connected to the noise acquisition device 7. The wiring harness 8 can be a power line, signal line, etc.

[0171] By setting a wiring groove 521 on the noise reduction grille 100, it is convenient to arrange and fix the wiring harness on the noise reduction grille 100.

[0172] Optionally, such as Figure 4 , Figures 11 to 13 As shown, the grille body 10 includes multiple ribs 5, some of which are radial ribs 52, and some of which are annular ribs 53. The radial ribs 52 extend radially along the noise reduction grille 100, and the multiple annular ribs 53 are arranged at radial intervals along the noise reduction grille 100, with the annular ribs 53 connected to the radial ribs 52. A wiring groove 521 is provided on the radial ribs 52.

[0173] By setting the wiring groove 521 on the radial rib 52, the original structure of the grille body 10 can be made reasonable use, which helps to reduce the cost of the noise reduction grille 100.

[0174] Optionally, such as Figure 12 As shown, the enclosure 2 is provided with a wiring hole 21, which is connected to the wiring groove 521.

[0175] For example, a wiring hole 21 is provided on the side of the enclosure 2 away from the first plate 1. By providing a wiring hole 21 in the enclosure 2, it is convenient for the wire harness 8 to pass through the cavity wall of the silencing cavity 40. For example, the first wire harness 81 connected to the drive mechanism 6 passes through the wiring hole 21.

[0176] like Figure 15 As shown, the method of using the noise reduction grille 100 in this embodiment includes:

[0177] S1. Obtain the external noise of the silencing cavity 40 when the second plate 3 is in different preset positions;

[0178] S2. When the external noise of the silencing cavity 40 is minimized, the preset position of the second plate 3 is the optimal position.

[0179] S3. Control the second plate 3 to move to the optimal position.

[0180] The second plate 3 has a first limit position and a second limit position. When the second plate 3 is in the first limit position, the distance between the second plate 3 and the first plate 1 in the axial direction of the noise reduction grid 100 is the largest. When the second plate 3 is in the second limit position, the distance between the second plate 3 and the first plate 1 in the axial direction of the noise reduction grid 100 is the smallest. The preset positions include the first limit position, the second limit position, and at least one position between the first limit position and the second limit position.

[0181] For example, when the second plate 3 abuts against the limiting portion 621 of the driving member 62, it is in the first extreme position; when the second plate 3 abuts against the positioning protrusion 13 of the first plate 1, it is in the second extreme position. The preset positions include the first extreme position, the second extreme position, and multiple positions between the first extreme position and the second extreme position.

[0182] By adjusting the second plate 3 to the optimal position, the external noise of the silencing cavity 40 is minimized, and the noise reduction effect of the noise reduction grille 100 is maximized.

[0183] Optionally, the spacing between any two adjacent preset positions is equal.

[0184] For example, if the distance between the first and second extreme positions is J, and the number of preset positions is N, where N is greater than or equal to 3, then the distance between two adjacent preset positions is J / N.

[0185] By setting the spacing between any two adjacent preset positions to be equal, the accuracy of the optimal position can be improved, thereby enhancing the noise reduction effect of the noise reduction grid 100.

[0186] When the driving component 62 is a driving motor, the driving motor drives the second plate 3 to move at a constant speed from the first limit position to the second limit position. The driving motor stops rotating after rotating by W degrees. The noise acquisition device 7 uses the noise outside the silencing cavity 40 to move the second plate 3 to multiple different preset positions and obtains the noise outside the silencing cavity 40 when the second plate 3 is in different preset positions.

[0187] The noise reduction grille 100 of this embodiment includes a noise reduction mode and a non-noise reduction mode. When the noise reduction grille 100 is in the noise reduction mode, the detailed usage method of the noise reduction grille 100 is as follows:

[0188] Move the second plate 3 to the first extreme position and turn on the noise acquisition device 7.

[0189] The noise acquisition device 7 acquires the noise value when the second plate 3 is in the first extreme position and feeds the noise value back to the storage unit;

[0190] The second plate 3 moves from the first extreme position to the second extreme position until it stops at the first extreme position. For every W angle that the drive motor rotates, a set of data is recorded. This data includes the angle W1 of the drive motor rotation, the position of the second plate 3, and the noise value collected by the noise acquisition device 7. This data is then fed back to the storage unit.

[0191] The analysis unit analyzes the data stored in the storage unit, compares the magnitude of the collected noise values, and obtains the angle of rotation of the drive motor and the position of the second plate 3 when the noise value is at its minimum.

[0192] The second plate 3 moves to the first extreme position, and then the drive motor rotates by an angle W1 and stops. At this time, the second plate 3 is in the optimal position, and the noise value is the smallest and the noise reduction effect is the best.

[0193] The noise reduction value is fed back to the user so that they can understand the noise reduction effect and enhance the user experience.

[0194] When the environment in which the noise reduction grille 100 is used changes, for example, when the noise reduction grille 100 is used on a fan and the fan speed changes, the above operation is repeated so that the noise reduction effect of the noise reduction grille 100 is optimal in the new environment.

[0195] like Figure 16 As shown, the fan assembly of this embodiment includes a housing 20, a noise reduction grille 100, and a fan wheel 30. The noise reduction grille 100 is the noise reduction grille 100 described in any of the above embodiments. The noise reduction grille 100 is connected to the housing 20 and forms a fan cavity. The fan wheel 30 is disposed inside the fan cavity.

[0196] By setting the noise reduction grille 100 of the wind turbine assembly to the noise reduction grille 100 described in any of the above embodiments, the noise of the wind turbine assembly can be effectively reduced, and the user experience of the wind turbine assembly can be improved.

[0197] Optionally, such as Figure 15 As shown, the grating body 10, the first plate 1, the shell 20 and the impeller 30 form a sound-absorbing cavity 40.

[0198] For example, such as Figure 16 As shown, the noise reduction grille 100 is disposed on the front side of the housing 20, and the front surface of the impeller 30, the rear surface of the noise reduction grille 100, and the inner side of the housing 20 form a sound-absorbing cavity 40. At this time, the first plate 1, the remaining part of the noise reduction grille 100, the housing 20, and the impeller 30 together form the above-mentioned cavity, which is a sound-absorbing cavity.

[0199] By forming a sound-absorbing cavity 40 between the noise-reducing grille 100, the housing 20, and the impeller 30, the structure of the noise-reducing grille 100 can be simplified (e.g., Figure 14 (As shown), this reduces the cost of the noise reduction grille 100.

[0200] The air conditioner of this disclosure includes the fan assembly described in any of the above embodiments.

[0201] By using the fan assembly described in any of the above embodiments, the noise of the air conditioner can be effectively reduced, and the user experience of the air conditioner can be improved.

[0202] In practical use, when the air conditioner is turned on, the user controls whether the noise-reducing grille 100 is in noise-reducing mode or not through the air conditioner's control unit. The control unit can be a remote control, a mobile app, a car infotainment app, etc., and the drive mechanism 6 is connected to the control unit via signal transmission.

[0203] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the scope of protection of the present disclosure.

Claims

1. A noise-reducing grille, characterized in that, It includes a grille body and a first plate connected to the grille body, the first plate being provided with a first sound-absorbing hole.

2. The noise-reducing grille according to claim 1, characterized in that, The noise reduction grille includes a surrounding panel, which is disposed on one side of the first plate body in the axial direction of the noise reduction grille and is connected to the first plate body and the grille body. At least a portion of the surrounding panel is used to form a sound-absorbing cavity.

3. The noise-reducing grille according to claim 2, characterized in that, At least one of the silencing cavities is a first silencing cavity; The noise reduction grille further includes a second plate, which is arranged at an axial distance from the first plate along the axial direction of the noise reduction grille and is connected to the surrounding plate. The second plate, the surrounding plate, and the first plate together form the first sound-absorbing cavity.

4. The noise-reducing grille according to claim 3, characterized in that, The second plate is disposed axially between the first plate and the grille body of the noise reduction grille; The second plate is movably connected to the enclosure along the axial direction of the noise reduction grille to adjust the volume of the first silencing cavity.

5. The noise-reducing grille according to claim 4, characterized in that, The number of the silencing cavities is at least two, and at least one of the silencing cavities is a second silencing cavity; The noise reduction grille also includes a third plate, which is disposed on the side of the second plate away from the first plate in the axial direction of the noise reduction grille and is connected to the surrounding plate. The third plate, the surrounding plate and the second plate form a second sound-absorbing cavity, and the third plate is provided with a second sound-absorbing hole communicating with the second sound-absorbing cavity.

6. The noise-reducing grille according to claim 5, characterized in that, The grid body is annular, and the third plate is disposed on the inner side of the grid body and connected to the grid body.

7. The noise-reducing grille according to claim 5, characterized in that, The first plate has a positioning protrusion that protrudes in the direction toward the second plate, and the positioning protrusion is used to abut against the second plate.

8. The noise-reducing grille according to claim 5, characterized in that, The number of the second silencing holes is multiple, and at least a portion of the second silencing holes have different or the same hole diameter; When at least some of the second silencing holes have different diameters, the second silencing hole with the larger diameter is located in the middle of the third plate, and the second silencing hole with the smaller diameter is located at the edge of the third plate.

9. The noise-reducing grille according to claim 5, characterized in that, The perforation rate of the third plate is 10% to 35%.

10. The noise-reducing grille according to any one of claims 4-9, characterized in that, The natural frequency of the first silencing cavity is 200Hz to 900Hz; The equivalent radius of the first silencing hole is positively correlated with the natural frequency of the first silencing cavity, and the axial dimension of the first silencing hole in the noise reduction grille, the equivalent diameter of the first plate, and the axial dimension of the first silencing cavity in the noise reduction grille are negatively correlated with the natural frequency of the first silencing cavity.

11. The noise-reducing grille according to claim 10, characterized in that, The equivalent radius of the first silencing hole is 2mm to 5mm.

12. The noise-reducing grille according to claim 11, characterized in that, The first silencing hole has a dimension of 2mm to 4mm in the axial direction of the noise reduction grille; The equivalent diameter of the first plate is 140mm to 160mm; The first silencing cavity has an axial dimension of 25mm to 35mm in the noise reduction grille.

13. The noise-reducing grille according to any one of claims 5-9, characterized in that, The natural frequency of the second silencing cavity is 200Hz to 900Hz; The equivalent radius of the second silencing hole is positively correlated with the natural frequency of the second silencing cavity, and the axial dimension of the second silencing hole in the noise reduction grid, the equivalent diameter of the third plate, and the axial dimension of the second silencing cavity in the noise reduction grid are negatively correlated with the natural frequency of the second silencing cavity.

14. The noise-reducing grille according to claim 13, characterized in that, The equivalent radius of the second silencing hole is 5mm to 8mm.

15. The noise-reducing grille according to claim 13, characterized in that, The second silencing hole has a dimension of 2.5mm to 5mm in the axial direction of the noise reduction grille; The equivalent diameter of the third plate is 140mm to 160mm; The second silencing cavity has an axial dimension of 25mm to 35mm in the noise reduction grille.

16. The noise-reducing grille according to any one of claims 5-9, characterized in that, The first silencing cavity has the same axial dimension as the second silencing cavity in the noise reduction grille.

17. The noise-reducing grille according to any one of claims 5-9, characterized in that, It also includes a drive mechanism, which is disposed in the second silencing cavity and is connected to the second plate to drive the second plate to move along the axial direction of the noise reduction grille.

18. The noise-reducing grille according to claim 17, characterized in that, The grille body is provided with a wiring groove for the wiring harness of the drive mechanism to pass through.

19. The noise-reducing grille according to claim 18, characterized in that, The grille body includes radial ribs and multiple annular ribs. The radial ribs extend radially along the noise reduction grille, and the multiple annular ribs are arranged at radial intervals along the noise reduction grille. The annular ribs are connected to the radial ribs, and the wiring groove is disposed on the radial ribs.

20. The noise-reducing grille according to claim 18, characterized in that, The enclosure is provided with wiring holes, which are connected to the wiring channels.

21. The noise-reducing grille according to any one of claims 2-9, characterized in that, It also includes a noise acquisition device, which is located outside the anechoic chamber to collect noise from outside the anechoic chamber.

22. The noise-reducing grille according to claim 21, characterized in that, The noise acquisition device is installed on the outer wall of the silencing cavity.

23. The noise-reducing grille according to any one of claims 1-9, characterized in that, The number of the first silencing holes is multiple, and at least a portion of the first silencing holes have different or the same hole diameter; When at least some of the first silencing holes have different diameters, the first silencing hole with the larger diameter is located in the middle of the first plate, and the first silencing hole with the smaller diameter is located at the edge of the first plate.

24. The noise-reducing grille according to any one of claims 1-9, characterized in that, The perforation rate of the first plate is 30% to 60%.

25. A method of using a noise-reducing grille according to any one of claims 5-20, characterized in that, include: The noise outside the silencing cavity is obtained when the second plate is in different preset positions; When the noise outside the silencing cavity is minimized, the preset position of the second plate is the optimal position. Control the second plate to move to the optimal position.

26. A fan assembly, characterized in that, include: The housing and the noise reduction grille, wherein the noise reduction grille is the noise reduction grille according to any one of claims 1-24, and the noise reduction grille is connected to the housing and forms a fan cavity; The wind turbine is disposed inside the fan cavity.

27. The wind turbine assembly according to claim 26, characterized in that, The grating body, the first plate, the shell, and the impeller form a sound-absorbing cavity.

28. An air conditioner, characterized in that, Includes the wind turbine assembly as described in claim 26 or 27.

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