Noise reduction device, air conditioner and noise reduction control method of air conditioner

Abstract

The invention relates to a noise reduction device, an air conditioner and a noise reduction control method of the air conditioner, relates to the technical field of air conditioning equipment, and aims to improve the noise reduction effect of an air conditioner outdoor unit. The noise reduction device comprises a noise reduction machine shell and a moving assembly. The noise reduction machine shell is provided with at least two resonant cavities distributed at intervals in the first direction, and a diameter pipe structure is arranged in each resonant cavity. The heights of the at least two resonant cavities in the second direction are sequentially increased, and an included angle is formed between the first direction and the second direction. The moving assembly is at least partially arranged in the resonant cavity and used for adjusting the resonant frequency of the resonant cavity.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment technology, and in particular to a noise reduction device, an air conditioner and a noise reduction control method thereof. Background Technology

[0002] With the miniaturization and weight reduction of air conditioner outdoor units, the increase in fan blade diameter and fan speed has made outdoor unit noise problems more and more significant. Inside the fan cavity of the outdoor unit, the noise components are complex, the sound quality is poor, and the peak frequency of the rotating noise exhibits dynamic changes at different operating speeds. Traditional solutions are difficult to effectively solve and cover the noise frequency range of the outdoor unit. Summary of the Invention

[0003] This application provides a noise reduction device, an air conditioner, and a noise reduction control method thereof, which aims to improve the noise reduction effect on the outdoor unit of the air conditioner.

[0004] In a first aspect, embodiments of this application provide a noise reduction device, including a noise reduction housing and a moving component. The noise reduction housing has at least two spaced-apart resonant cavities along a first direction, and each resonant cavity contains a tubular structure. The height of the at least two resonant cavities increases sequentially in a second direction, and an angle is formed between the first and second directions. The moving component is at least partially disposed within the resonant cavity for adjusting the resonant frequency of the resonant cavity.

[0005] In some implementations, the noise reduction housing includes at least two tube plates, one of which is disposed within a resonant cavity. Along a first direction, the side plates of the resonant cavity on the same side are spaced apart from the tube plates to form a tube structure. The length of the tube structure is set along a second direction.

[0006] In some implementations, the moving component includes a positioning element, at least two extension plates, and a driving element. The positioning element is located on one side of the noise reduction housing along a second direction. The noise reduction housing has a slotted hole communicating with a resonant cavity. One end of an extension plate is inserted into a resonant cavity through the slotted hole. The extension plate contacts the diameter tube plate along a first direction, and the other end of the extension plate is connected to the positioning element. The driving element is connected to the positioning element and is used to move the positioning element and the extension plates along a third direction. The third direction, the second direction, and the first direction are at angles to each other.

[0007] In some implementations, the drive components include a drive motor, a drive gear, and a drive rack. The drive motor is connected to the noise reduction housing. The drive gear is located at the output end of the drive motor. The drive rack is positioned along a third direction and connected to a positioning element, and the drive rack meshes with the drive gear.

[0008] In some implementations, the noise reduction device includes at least two sound-absorbing cottons, with one sound-absorbing cotton placed inside a resonant cavity, and the sound-absorbing cotton and the diameter pipe plate located at both ends of the resonant cavity along a third direction.

[0009] In some implementations, the noise-reducing housing includes a first side plate, a second side plate, two third side plates, a partition, and a fourth side plate. The second side plate is perpendicularly connected to the first side plate. Along a third direction, the opposite ends of the first and second side plates are sequentially connected to a third side plate. The partition is spaced apart from the first side plate along a first direction. The fourth side plate is an arc-shaped plate, and the first side plate, the second side plate, the two third side plates, and the partition are connected to the arc-shaped plate to form at least two resonant cavities.

[0010] The dimensions of the first side plate and the partition plate along the second direction are the height dimensions of the resonant cavity, and the third direction, the second direction and the first direction have included angles with each other.

[0011] In a second aspect, embodiments of this application provide an air conditioner, characterized in that it includes the noise reduction device mentioned in the first aspect and an outdoor unit. The outdoor unit includes a housing, an outdoor fan and an air guide ring. The housing is provided with an air outlet. The outdoor fan is located inside the housing and is arranged facing the air outlet. The air guide ring is located inside the air outlet and is connected to the housing. The noise reduction device is connected to the inside of the housing on the outside of the air guide ring away from the air outlet.

[0012] In some implementations, there are multiple noise reduction devices, which are distributed at intervals along the circumference of the air guide ring.

[0013] In some implementations, the air conditioner also includes a microphone and a control module. The microphone, housed within the housing, is used to detect noise levels. The microphone, outdoor fan, and moving components are electrically connected to the control module.

[0014] Thirdly, embodiments of this application provide a noise reduction control method for an air conditioner, used to control the air conditioner in the second aspect. The noise reduction control method includes: Obtain the current speed of the outdoor fan and the predicted speed after a preset time.

[0015] Based on the current rotational speed, determine whether the preset rotational speed has changed.

[0016] If the predicted rotational speed is the same as the current rotational speed, the moving component of the noise reduction device will be kept in its current position.

[0017] If the predicted rotational speed is different from the current rotational speed, the first position parameter of the moving component is calculated based on the predicted rotational speed and the operating parameters, and the moving component is controlled to move to the position corresponding to the first position parameter.

[0018] In some implementations, after controlling the moving component to the appropriate position, the noise reduction control method includes: Obtain noise parameters inside the housing.

[0019] Obtain the noise frequency corresponding to the noise intensity being greater than the threshold in the noise parameters.

[0020] The second position parameters of the moving component are obtained based on the noise frequency and operating parameters.

[0021] Control the moving component to move to the position corresponding to the second position parameter.

[0022] The technical solutions provided in this application have the following advantages compared with the prior art: Therefore, the noise reduction device of this embodiment achieves multi-band sound energy absorption by setting at least two resonant cavities spaced apart along a first direction and with their height dimensions increasing sequentially in a second direction. Simultaneously, by introducing a moving component to adjust the resonant frequency of the resonant cavities, the noise reduction device can adapt to different noise peaks caused by variations in the outdoor fan speed, thereby providing a wide-band and adjustable noise reduction effect, effectively solving the problem of traditional noise reduction solutions performing poorly in complex and variable noise environments.

[0023] In other words, by integrating the aforementioned noise reduction device into the air conditioner and connecting it to the inner side of the outdoor unit casing, specifically positioned on the outer side of the air guide ring radially away from the air outlet, the noise problem generated during air conditioner operation, particularly by the outdoor fan, can be effectively solved. This noise reduction device is strategically placed along the main noise propagation path of the outdoor fan, allowing its resonant cavity structure to directly capture and attenuate specific frequency noise generated by the fan. Since the moving components of the noise reduction device can adjust the resonant frequency of the resonant cavity, the noise reduction effect can be dynamically adjusted according to the operating status of the outdoor fan (such as speed changes), achieving precise noise suppression under different operating conditions. This integration method not only fully utilizes the performance of the noise reduction device but also avoids significant obstruction to the original airflow channels of the air conditioner, ensuring that the air conditioner's cooling or heating performance remains unaffected while effectively reducing noise, thereby significantly improving the overall user experience of the air conditioner. Attached Figure Description The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0026] Figure 1 This is a schematic diagram of the internal structure of an outdoor unit of an air conditioner provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the shell shown in Figure 1; Figure 3 for Figure 1 A three-dimensional structural schematic diagram of the noise reduction device shown in the figure; Figure 4 for Figure 3 A magnified view of a portion of point A in the middle; Figure 5 for Figure 1 A front view of the noise reduction device shown in the figure; Figure 6 for Figure 5 Sectional view along line BB; Figure 7 for Figure 3 A schematic diagram of an exploded structure of the noise reduction device shown. Figure 8 This application provides an electrical connection diagram of an air conditioner according to an embodiment of the present application. Figure 9 A comparative data chart showing the effect of the noise reduction device before and after the improvement; Figure 10 A flowchart of a noise reduction control method for a first type of air conditioner provided in this application embodiment; Figure 11 This is a flowchart of a second noise reduction control method for an air conditioner provided in an embodiment of this application; Figure 12 This is a schematic diagram of the connection structure of a control module provided in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures: 100. Air conditioner; 10. Outdoor unit; 11. Housing; 12. Outdoor fan; 13. Air guide ring; 14. Air outlet; 20. Noise reduction device; 21. Noise-reducing housing; 211. Resonance cavity; 212. Pipe structure; 213. Pipe plate; 214. First side plate; 215. Second side plate; 216. Third side plate; 217. Partition plate; 218. Fourth side plate; 22. Moving component; 221. Positioning component; 222. Extension plate; 223. Driving component; 2231. Drive motor; 2232. Drive gear; 2233. Drive rack; 23. Sound-absorbing cotton; 31. Control module; 311. Processor; 312. Communication interface; 313. Memory; 314. Communication bus; 32. Microphone; X, first direction; Z, second direction; Y, third direction. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0030] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0031] Please see Figures 1 to 2 This application provides a noise reduction device, an air conditioner, and a noise reduction control method thereof, which aims to improve the noise reduction effect on the outdoor unit of the air conditioner.

[0032] In a first aspect, embodiments of this application provide an air conditioner, such as... Figure 1 and Figure 3 As shown, the air conditioner 100 includes an outdoor unit 10 and a noise reduction device 20.

[0033] like Figure 1 As shown, the outdoor unit 10 includes a housing 11, an outdoor fan 12, and an air guide ring 13. The housing 11 is provided with an air outlet 14. The outdoor fan 12 is located inside the housing 11 and faces the air outlet 14. The air guide ring 13 is located inside the air outlet 14 and is connected to the housing 11. On the outside of the air guide ring 13 away from the air outlet 14, a noise reduction device 20 is connected to the inside of the housing 11.

[0034] An air conditioner 100 is a device used to regulate indoor air temperature, humidity, cleanliness, and airflow speed. In the outdoor unit 10, the main sources of noise include the compressor, fan, and wind noise generated when airflow passes through ducts and components.

[0035] The air conditioner 100 in this application can be of various types, such as a residential split-type air conditioner, a central air conditioner, or a commercial air conditioner. The outdoor unit 10 is a major component of the air conditioner 100, and typically includes core components such as a compressor, a condenser, and an outdoor fan 12. The outdoor unit 10 generates significant noise during operation, especially the wind noise and mechanical vibration noise generated by the outdoor fan 12 when it operates at high speed.

[0036] The housing 11 is the external structure of the outdoor unit 10, used to protect the internal components from the influence of the external environment and to form a specific airflow channel. The housing 11 is usually made of sheet metal or engineering plastic, and its internal structural design has a certain impact on the propagation and attenuation of noise.

[0037] The air outlet 14 is the channel through which air is exhausted from the outdoor unit 10. It is usually located at the front or top of the outdoor unit 10, and its size and shape design will affect airflow resistance and noise propagation characteristics.

[0038] The outdoor fan 12 is a key component in the outdoor unit 10 used to force airflow through the condenser for heat exchange. When the outdoor fan 12 rotates, it generates periodic airflow disturbances, resulting in broadband noise, with the interaction between the fan blades and the airflow being the main noise source.

[0039] The air guide ring 13 is typically installed inside the air outlet 14 of the outdoor unit 10 and connected to the housing 11. Its main function is to guide the airflow generated by the outdoor fan 12, allowing it to be discharged more smoothly, reducing airflow turbulence, thereby improving fan efficiency and reducing some wind noise. The air guide ring 13 is usually annular or nearly annular in structure and can be made of plastic or metal.

[0040] The noise reduction device 20 can be fixed to the inner wall of the front panel of the housing 11 by means of screws, clips, welding or bonding. The noise reduction device 20 is located on the outer side of the air guide ring 13 radially away from the air outlet 14. The noise reduction device 20 is set at this location to directly act on the airflow noise generated by the fan, so as to achieve efficient noise attenuation.

[0041] As shown Figure 4 in FIG. 1, the noise reduction device 20 includes a noise reduction housing 21 and a moving component 22. The noise reduction housing 21 is provided with at least two resonating cavities 211 spaced apart along a first direction X, and a radial tube structure 212 is disposed in each resonating cavity 211. The height dimensions of at least two resonating cavities 211 in a second direction Z increase in sequence, and there is an included angle between the first direction X and the second direction Z. The moving component 22 is at least partially disposed in the resonating cavity 211 and is used to adjust the resonance frequency of the resonating cavity 211.

[0042] The noise reduction housing 21 is designed to be provided with at least two resonating cavities 211 spaced apart along the first direction X. Specifically, the noise reduction housing 21 can be formed by splicing a plurality of independent cavity units through connecting members, or by arranging partition plates 217 inside an integrally formed housing 11. These resonating cavities 211 are arranged along a preset first direction X, such as the horizontal direction, and are spaced apart from each other. This spaced-apart distribution helps prevent acoustic coupling interference between the cavities and provides independent acoustic characteristics for each cavity.

[0043] A radial tube structure 212 is disposed in each resonating cavity 211. The radial tube structure 212 can be a simple opening with a fixed length and cross-sectional area, for example, directly opening a hole in the wall of the resonating cavity 211 to form a short neck. As another implementation, the radial tube structure 212 can be an independent tubular component fixed at the entrance of the resonating cavity 211.

[0044] The height dimensions of at least two resonating cavities 211 in the second direction Z increase in sequence. For example, if there are three resonating cavities 211, the height of the first cavity is H1, the second is H2, and the third is H3, and H1 < H2 < H3. This difference in height dimensions can be achieved by adjusting the relative positions or sizes and shapes of the cavity side walls.

[0045] There is an included angle between the first direction X and the second direction Z. For example, the first direction X can be the horizontal direction, and the second direction Z can be the vertical direction, forming a 90-degree included angle therebetween. As an alternative implementation, the first direction X and the second direction Z can be non-orthogonal, for example, forming an included angle of 45 degrees or 60 degrees. This angular relationship can be achieved by adjusting the overall layout of the noise reduction housing 21 or the internal structure of the resonating cavity 211.

[0046] Taking the side of the housing 11 provided with the air outlet ......... 14 as the front side, the housing 11 is provided with the air outlet 14 along a third direction Y. That is, the third direction Y can be the front-back direction, the second direction Z corresponding to the height dimension direction is the up-down direction, and the first direction X is the left-right direction.

[0047] The movable component 22 is at least partially disposed within the resonant cavity 211 for adjusting the resonant frequency of the resonant cavity 211. Specifically, the movable component 22 may be a simple slider that is manually or by means of an external tool to change the effective length of the tube structure 212 or the effective volume of the resonant cavity 211. For example, the slider may be partially inserted into the tube structure 212 to change its acoustic length.

[0048] Therefore, the noise reduction device 20 of this embodiment achieves multi-band sound energy absorption by setting at least two resonant cavities 211 that are spaced apart along the first direction X and whose height dimensions increase sequentially along the second direction Z. Simultaneously, by introducing the moving component 22 to adjust the resonant frequency of the resonant cavities 211, the noise reduction device 20 can adapt to different noise peaks caused by changes in the rotational speed of the outdoor fan 12, thereby providing a wide-band and adjustable noise reduction effect, effectively solving the problem of poor performance of traditional noise reduction solutions in complex and variable noise environments.

[0049] In other words, by integrating the aforementioned noise reduction device 20 into the air conditioner 100 and connecting it to the inner side of the outdoor unit 10 housing 11, specifically positioned on the outer side of the air guide ring 13 radially away from the air outlet 14, the noise problem generated by the outdoor fan 12 during the operation of the air conditioner 100 can be effectively solved. The noise reduction device 20 is strategically placed along the main noise propagation path of the outdoor fan 12, allowing its resonant cavity 211 structure to directly capture and attenuate specific frequency noise generated by the fan. Since the moving component 22 of the noise reduction device 20 can adjust the resonant frequency of the resonant cavity 211, the noise reduction effect can be dynamically adjusted according to the operating state of the outdoor fan 12 (such as speed changes), achieving precise noise suppression under different operating conditions. This integration method not only fully utilizes the performance of the noise reduction device 20 but also avoids significant obstruction to the original airflow channels of the air conditioner 100, ensuring that the cooling or heating performance of the air conditioner 100 remains unaffected while effectively reducing noise, thereby significantly improving the overall user experience of the air conditioner 100.

[0050] It should be noted that the noise reduction device 20 provided in this application embodiment can be applied inside the outdoor unit 10 or at the indoor unit of the air conditioner 100. It can also be applied to structures that require dynamic or static noise reduction, such as ducted air conditioners, heat pump units, and air source water heaters, and there are no limitations on this application.

[0051] For example, such as Figure 2As shown, there are multiple noise reduction devices 20, which are distributed at intervals along the circumference of the air guide ring 13. The use of multiple noise reduction devices 20 allows the noise reduction capability to be superimposed and expanded, enabling it to cope with a more complex and wider noise spectrum. For example, two, three, four or more noise reduction devices 20 can be configured according to the size of the outdoor unit 10, the characteristics of the fan noise, and the desired noise reduction level.

[0052] Multiple noise reduction devices 20 are distributed circumferentially around the air guide ring 13. This means that these noise reduction devices 20 are not concentrated in a specific area of ​​the air guide ring 13, but are arranged evenly or non-uniformly along the circumference of the air guide ring 13, with a certain interval between adjacent devices. This distribution method ensures that the noise reduction effect can cover the entire circumferential range of the air guide ring 13, thereby achieving comprehensive control of the fan noise. For example, multiple noise reduction devices 20 can be distributed at equal angles around the air guide ring 13, such as one noise reduction device 20 every 90 degrees or 120 degrees, to ensure that noise is effectively treated in all directions.

[0053] Since the air guide ring 13 is usually a circular structure, while the front panel of the housing 11 is rectangular or square, there are four corner spaces on the inner side of the front panel of the housing 11. A noise reduction device 20 can be set at 90° intervals on the outer side of the air guide ring 13. That is, four noise reduction devices 20 are used to make full use of the four corner spaces and achieve a good combined noise reduction effect.

[0054] By employing multiple noise reduction devices 20 and distributing them circumferentially along the air guide ring 13, the air conditioner 100 can more comprehensively and uniformly suppress the noise generated by the outdoor fan 12. Fan noise typically propagates in multiple modes around the air guide ring 13, making it difficult for a single noise reduction device 20 to effectively cover all noise sources and propagation paths. The circumferential distribution of multiple noise reduction devices 20 allows for noise capture and attenuation from multiple angles and positions, avoiding the problem of poor localized noise reduction. This configuration significantly improves the overall noise reduction performance of the air conditioner 100, effectively controlling noise emissions in all directions and providing users with a quieter operating environment. Simultaneously, the moving components 22 of each noise reduction device 20 can still independently or collaboratively adjust their resonant frequency, further enhancing the system's adaptability to noise characteristics under different operating conditions and achieving more refined noise management.

[0055] In some embodiments, such as Figure 5 As shown, the noise reduction housing 21 includes at least two diameter tube plates 213. One diameter tube plate 213 is disposed within a resonant cavity 211. Along the first direction X, the side plate of the resonant cavity 211 on the same side is spaced apart from the diameter tube plate 213 to form a diameter tube structure 212. The length dimension of the diameter tube structure 212 is set along the second direction Z.

[0056] The duct plate 213 is a key component used to form the duct structure 212 within the resonant cavity 211. These duct plates 213 are typically made of materials with sufficient rigidity and acoustic stability, such as metal plates, high-density plastic plates, or composite material plates. Their main function is to cooperate with the side plates of the resonant cavity 211 to define the geometry of the duct, including its length and cross-sectional area, parameters that directly affect the acoustic characteristics and resonant frequency of the duct. By precisely designing and manufacturing the duct plate 213, it can be ensured that the duct structure 212 within each resonant cavity 211 has the desired acoustic response.

[0057] By setting a diameter plate 213 within a resonant cavity 211, each resonant cavity 211 has an independent diameter structure 212. This means the acoustic characteristics of each resonant cavity 211 can be independently designed and optimized to meet different noise reduction requirements. For example, when the noise reduction device 20 needs to reduce broadband noise, diameter plates 213 of different sizes can be configured for different resonant cavities 211, thereby forming diameter structures 212 with different resonant frequencies and achieving a wider range of noise suppression effects.

[0058] Specifically, the duct structure 212 is not a specific tubular component, but rather a gap or channel formed between the side plate inside the noise reduction housing 21 and the duct plate 213. The side plate can be the inner wall of the resonant cavity 211. The duct plate 213 is arranged parallel or approximately parallel to the side plate, maintaining a certain distance between them, thus forming a channel with a specific cross-sectional area, namely the duct structure 212. This formation method allows the duct structure 212 to be tightly integrated with the overall structure of the resonant cavity 211, improving the compactness and stability of the structure. The first direction X is the direction along which the resonant cavity 211 is distributed, ensuring the rational layout of the duct structure 212 inside the resonant cavity 211.

[0059] The second direction Z is the direction in which the height of the resonant cavity 211 increases sequentially. Setting the height of the duct structure 212 along the second direction Z means that the effective length of the duct corresponds to the height variation trend of the resonant cavity 211. Since the length of the duct is one of the key parameters determining its resonant frequency, this arrangement allows resonant cavities 211 of different heights to naturally form duct structures 212 with different resonant lengths, thus making it easier to achieve multi-band noise suppression. For example, as the height of the resonant cavity 211 increases, the length of the duct can also be increased accordingly to match or adjust its resonant frequency.

[0060] By introducing the duct plate 213 and clarifying its fit with the side plate of the resonant cavity 211, as well as the specific directional setting of the length dimension of the duct structure 212, the duct structure 212 within each resonant cavity 211 has a clear geometric definition and controllable acoustic characteristics. This structured design not only solves the problem of the specific implementation of the duct structure 212, but also, by linking the duct length with the direction of change of the height dimension of the resonant cavity 211, enables more precise design and adjustment of the resonant frequencies of different resonant cavities 211, thereby achieving effective suppression of noise in a specific frequency range. Furthermore, this formation method also provides a clear target for the adjustment of the resonant frequency by the moving component 22. For example, by changing the relative position between the duct plate 213 and the side plate or the effective length of the duct, the noise reduction performance can be further optimized, enabling the noise reduction device 20 to adapt to more complex noise environments.

[0061] like Figure 3 and Figure 4 As shown, the moving component 22 includes a positioning element 221 and at least two extension plates 222 (see reference). Figure 6 and Figure 7 The noise reduction housing 21 is located on one side of the noise reduction housing 21 along the second direction Z. The noise reduction housing 21 has a strip hole that connects to the resonant cavity 211. One end of an extension plate 222 is inserted into a resonant cavity 211 through the strip hole. The extension plate 222 contacts the diameter tube plate 213 along the first direction X. The other end of the extension plate 222 is connected to the positioning member 221. The driving member 223 is connected to the positioning member 221 and is used to drive the positioning member 221 and the extension plate 222 to move along the third direction Y. The third direction Y, the second direction Z, and the first direction X have included angles with each other.

[0062] The positioning component 221 is a structural component used to support and guide the movement of the extension plate 222. It can be a long, plate-like, rod-like, or frame-like structure, and can be made of materials with sufficient rigidity and wear resistance, such as metal alloys (e.g., aluminum alloys, stainless steel) or high-strength engineering plastics. The positioning component 221 is positioned along the second direction Z on one side of the noise-reducing housing 21 (e.g., the upper side of the noise-reducing housing 21), which allows for easy connection to the external drive component 223 and provides a stable connection base for the extension plate 222, while avoiding occupying valuable space inside the resonant cavity 211.

[0063] The extension plate 222 is a plate-like structure inserted into the resonant cavity 211 and in contact with or abutting the diaphragm plate 213. It is typically designed as a thin plate to ensure smooth sliding within the resonant cavity 211 and to match the height of the diaphragm plate 213. The extension plate 222 can be made of lightweight materials with sufficient strength, such as aluminum alloy, carbon fiber composites, or engineering plastics, to withstand the impact of airflow within the resonant cavity 211.

[0064] The noise reduction housing 21 has strip-shaped holes (extending along the third direction Y) connecting to the resonant cavity 211. One end of the extension plate 222 is inserted into the corresponding resonant cavity 211 through these strip-shaped holes. Inside the resonant cavity 211, the extension plate 222 contacts or adheres to the diameter pipe plate 213 along the first direction X. By moving the extension plate 222, the effective length of the diameter pipe structure 212 (formed by the side plate of the resonant cavity 211 and the diameter pipe plate 213) in the third direction Y can be effectively changed, thereby adjusting the resonant frequency of the resonant cavity 211. The other end of the extension plate 222 is firmly connected to the positioning member 221, ensuring that it can move synchronously with the positioning member 221.

[0065] The drive component 223 is the mechanism that provides power to the entire moving assembly 22. It is connected to the positioning component 221 and is responsible for moving the positioning component 221 and the extension plate 222 connected to it along the third direction Y. The drive component 223 can be implemented in various ways, such as an electric actuator, a gear and rack mechanism driven by a motor, a lead screw mechanism, or even a manual adjustment mechanism (such as a handwheel with a lead screw). The specific choice depends on the required adjustment accuracy, speed, and degree of automation.

[0066] Thus, the positioning element 221 serves as a unified connection point for multiple extension plates 222, enabling a single drive element 223 to achieve synchronous or coordinated movement control of multiple extension plates 222. The extension plates 222 are inserted into the resonant cavity 211 through the slotted holes and directly contact the diameter pipe plate 213. Their movement along the third direction Y precisely changes the length of the diameter pipe structure 212, thereby achieving fine adjustment of the resonant frequency of the resonant cavity 211. This design is not only compact and effectively utilizes the internal space of the resonant cavity 211, but also places the drive mechanism outside or on one side of the noise reduction housing 21, facilitating maintenance and operation. The stable connection between the drive element 223 and the positioning element 221, along with the smooth sliding of the extension plates 222 within the slotted holes, together constitute a reliable and stable adjustment mechanism, effectively reducing wear on moving parts and improving the long-term operational reliability of the noise reduction device 20. This solution can dynamically and precisely adjust the resonant frequency of the resonant cavity 211 according to the actual noise spectrum or preset operating conditions, thereby achieving wider bandwidth or more precise noise suppression and significantly improving the overall noise reduction effect of the noise reduction device 20.

[0067] Continue to refer to Figure 4 The driving component 223 includes a drive motor 2231, a drive gear 2232, and a drive rack 2233. The drive motor 2231 is connected to the noise reduction housing 21. The drive gear 2232 is located at the output end of the drive motor 2231. The drive rack 2233 is positioned along the third direction Y and connected to the positioning component 221, and the drive rack 2233 meshes with the drive gear 2232.

[0068] The drive motor 2231 is a device that converts electrical energy into mechanical energy, providing a power source for the entire moving assembly 22. Various types of drive motors 2231 can be selected, such as stepper motors, servo motors, or DC motors, to meet different control precision and response speed requirements. The drive motor 2231 is connected to the noise-reducing housing 21 to ensure stable support and a fixed reference point during operation, thereby guaranteeing the effective transmission of driving force.

[0069] The drive gear 2232 is located at the output end of the drive motor 2231 and is used to convert the rotational motion of the drive motor 2231 into linear motion. The drive gear 2232 is typically cylindrical with teeth on its outer circumference, which mesh with the teeth of the drive rack 2233. The number of teeth and module of the drive gear 2232 can be designed according to the required transmission ratio and load capacity to achieve precise displacement control and sufficient driving force.

[0070] The drive rack 2233 is positioned along the third direction Y and connected to the positioning member 221. The drive rack 2233 is a toothed linear rod whose teeth mesh with the teeth of the drive gear 2232, together forming a gear and rack transmission mechanism. When the drive gear 2232 rotates, the drive rack 2233 moves linearly along its length direction (i.e., the third direction Y), thereby driving the positioning member 221 and the extension plate 222 connected to it to perform precise linear displacement. This transmission method has advantages such as simple structure, constant transmission ratio, high transmission efficiency, and high positioning accuracy.

[0071] By employing a drive unit 223 consisting of a drive motor 2231, a drive gear 2232, and a drive rack 2233, this application enables precise and stable linear movement control of the positioning member 221 and the extension plate 222 along the third direction Y. The drive motor 2231 provides reliable power, and the drive gear 2232 efficiently converts the rotational motion into the linear motion of the drive rack 2233. This gear and rack transmission mechanism has high transmission accuracy and rigidity, ensuring accurate positioning of the extension plate 222 within the resonant cavity 211, thereby achieving fine adjustment of the resonant frequency. Furthermore, gear and rack transmission mechanisms typically possess a certain self-locking characteristic or high friction, which helps maintain the extension plate 222 in a preset position after the drive motor 2231 stops working, effectively preventing positional drift caused by vibration or other external factors, thus ensuring the continuous and stable noise reduction effect of the noise reduction device 20.

[0072] like Figure 8 As shown, the air conditioner 100 also includes a microphone 32 and a control module 31. The microphone 32 is disposed inside the housing 11 and is used to detect noise intensity. The microphone 32, the outdoor fan 12, and the moving component 22 are electrically connected to the control module 31.

[0073] Microphone 32 is an acoustic sensor whose main function is to convert sound waves into electrical signals. In this application, microphone 32 is disposed inside the housing 11 of air conditioner 100, and its function is to detect the noise intensity generated during the operation of air conditioner 100 in real time. Microphone 32 can be an electret microphone 32, a MEMS (microelectromechanical system) microphone 32, or a piezoelectric microphone 32, etc. These microphones 32 have good sensitivity and frequency response characteristics and can effectively capture the noise generated by outdoor fan 12. To ensure the accuracy of noise detection, microphone 32 is usually placed close to the noise source (such as outdoor fan 12 or air outlet 14) to collect noise signals more directly.

[0074] The control module 31 is the core intelligent unit of the entire noise reduction system, responsible for receiving and processing information and issuing control commands. This control module 31 can be a microcontroller (MCU), digital signal processor (DSP), or embedded system, typically containing a processor, memory, and input / output interfaces. The control module 31 analyzes the noise signal detected by the microphone 32 using a preset control algorithm, and combines this with the operating status of the outdoor fan 12 (such as speed and power) to comprehensively determine the current noise characteristics and noise reduction requirements.

[0075] like Figure 7 As shown, microphone 32, outdoor fan 12, and moving component 22 (i.e., drive motor 2231) are electrically connected to control module 31, ensuring smooth information and control flow. Specifically, microphone 32 converts the acquired analog sound signal into an electrical signal, which is then processed by an analog-to-digital converter (ADC) before being input to control module 31. Operating parameters of outdoor fan 12 (such as speed signals) are also transmitted to control module 31 via electrical connection. After completing noise analysis and control strategy calculation, control module 31 outputs control commands to the driver of moving component 22 via electrical signals, driving moving component 22 to precisely move to the target position, thereby adjusting the resonant frequency of noise reduction device 20. This electrical connection method constructs a closed-loop control system, enabling noise reduction device 20 to intelligently adjust according to real-time noise conditions.

[0076] By introducing a microphone 32 and a control module 31 into the air conditioner 100, and electrically connecting the microphone 32, outdoor fan 12, and moving component 22 to the control module 31, the operation of the noise reduction device 20 is no longer passive or manually adjusted. The microphone 32 can detect the noise intensity inside the air conditioner 100 in real time and accurately, feeding the noise information back to the control module 31. The control module 31, combined with the operating status of the outdoor fan 12, can intelligently analyze the frequency and intensity characteristics of the current noise and accurately calculate the optimal position of the moving component 22 based on a preset noise reduction algorithm. Subsequently, the control module 31 controls the moving component 22 to move to the corresponding position, thereby dynamically adjusting the resonant frequency of the noise reduction device 20 to match the current noise frequency, achieving efficient noise absorption and attenuation. This intelligent adaptive control mechanism significantly improves the response speed and adjustment accuracy of the noise reduction device 20 to noise changes, ensuring that the air conditioner 100 maintains excellent noise reduction performance under different operating conditions, greatly optimizing the user experience.

[0077] In some embodiments, such as Figure 5 As shown, the noise reduction device 20 includes at least two sound-absorbing cottons 23, and one sound-absorbing cotton 23 is disposed in a resonant cavity 211. The sound-absorbing cotton 23 and the diameter tube plate 213 are located at both ends of the resonant cavity 211 along the third direction Y.

[0078] Sound-absorbing cotton 23 is a porous sound-absorbing material with numerous interconnected micropores inside. When sound waves are incident on the surface of sound-absorbing cotton 23, the sound waves propagate within the pores, rubbing against the pore walls and causing air viscous resistance, thereby converting sound energy into heat energy and dissipating it. The material of sound-absorbing cotton 23 can be polyester fiber, glass fiber, rock wool, or foam plastic, etc. Its sound absorption performance can be optimized by adjusting its density, thickness, and surface treatment to meet the sound absorption needs of different frequency ranges.

[0079] A sound-absorbing cotton 23 is placed inside each resonant cavity 211 to ensure that each independent resonant cavity 211 can utilize the sound-absorbing characteristics of the sound-absorbing cotton 23. This arrangement allows each resonant cavity 211 to not only attenuate noise at specific frequencies through the principle of resonance, but also absorb noise at non-resonant frequencies through the sound-absorbing cotton 23, thereby enhancing the overall noise reduction capability of a single resonant cavity 211.

[0080] The sound-absorbing cotton 23 and the diameter tube plate 213 are located at opposite ends of the resonant cavity 211 along the third direction Y. This arrangement allows sound waves to interact with the resonant structure formed by the diameter tube plate 213 and also make full contact with the sound-absorbing cotton 23 when propagating within the resonant cavity 211. Placing the sound-absorbing cotton 23 at the end of the resonant cavity 211 effectively absorbs sound waves reflected inside the cavity, reduces standing wave effects, and provides a longer absorption path for sound waves, thereby improving noise reduction efficiency.

[0081] In some embodiments, such as Figure 7 As shown, the noise reduction housing 21 includes a first side plate 214, a second side plate 215, two third side plates 216, a partition 217, and a fourth side plate 218. The second side plate 215 is perpendicularly connected to the first side plate 214. Along the third direction Y, the opposite ends of the first side plate 214 and the second side plate 215 are sequentially connected to a third side plate 216. The partition 217 is spaced apart from the first side plate 214 along the first direction X. The fourth side plate 218 is an arc-shaped plate, and the first side plate 214, the second side plate 215, the two third side plates 216, and the partition 217 are connected to the arc-shaped plate to form at least two resonant cavities 211.

[0082] The dimensions of the first side plate 214 and the partition plate 217 along the second direction Z are the height dimensions of the resonant cavity 211, and the third direction Y, the second direction Z and the first direction X have included angles with each other.

[0083] The first side plate 214, as a major boundary of the noise-reducing housing 21, is typically made of a material with sufficient rigidity, such as sheet metal or high-strength engineering plastic, to provide structural support and effectively block noise. Its dimension along the second direction Z directly determines the height of the largest side resonant cavity 211, which is one of the key parameters for achieving different resonant frequencies.

[0084] The second side plate 215 is vertically connected to the first side plate 214, together forming the basic frame of the noise reduction housing 21, ensuring the overall stability and geometric accuracy of the housing. This vertical connection method helps to create a regular internal space, facilitating the installation of subsequent components.

[0085] Two third side plates 216 connect the opposite ends of the first side plate 214 and the second side plate 215 along the third direction Y. They serve as the ends or sidewalls of the housing, further perfecting the closed structure of the resonant cavity 211. The arrangement of these side plates gives the resonant cavity 211 a clear boundary in the third direction Y, which helps to control the propagation path of sound waves.

[0086] The partition 217 is spaced apart from the first side plate 214 along the first direction X. Its main function is to divide the internal space of the noise reduction housing 21 into at least two independent resonant cavities 211. By precisely controlling the distance between the partition 217 and the first side plate 214, it can be ensured that the dimensions of each resonant cavity 211 meet the design requirements, thereby achieving the expected resonant frequency. The material and structure of the partition 217 should be similar to those of the first side plate 214 to ensure good acoustic isolation.

[0087] The fourth side plate 218 is designed as an arc-shaped plate. This arc-shaped plate is connected to the first side plate 214, the second side plate 215, the two third side plates 216, and the partition plate 217, together forming at least two resonant cavities 211. The arc-shaped plate design allows the height of the resonant cavities 211 to increase smoothly and sequentially along the second direction Z, thereby meeting the absorption requirements of the noise reduction device 20 for noise of different frequencies. The arc-shaped structure not only helps to optimize acoustic performance but may also enhance the overall rigidity of the casing, while also matching the annular sidewall of the air guide ring 13.

[0088] The design of the arc-shaped fourth side plate 218 cleverly solves the problem of the gradual change in height of the resonant cavity 211, avoiding the step effect or complex processing that may be caused by traditional straight structures. At the same time, it can also match the annular sidewall of the air guide ring 13 to improve the space utilization in the outdoor unit 10. This structure not only ensures the geometric accuracy of the resonant cavity 211, thereby ensuring the accuracy of the resonant frequency, but also helps to optimize acoustic performance and improve noise reduction efficiency. Meanwhile, the clear definition of the dimensions of the side plate and the partition 217 and the angular relationship between their directions make the entire noise reduction device 20 compact and easy to integrate into space-constrained applications such as air conditioners 100. This effectively solves the problems of complex casing structure design, difficulty in accurately controlling the cavity shape, and low integration when implementing a noise reduction device 20 with an adjustable resonant frequency, thereby improving the overall performance and applicability of the noise reduction device 20.

[0089] Taking, for example, the noise-reducing housing 21 in this embodiment of the application has three resonant cavities 211 arranged sequentially along the first direction. Figure 9 As shown, Figure 9 The curve shown in the middle represents the sound absorption frequency parameters of a single-chamber structure in the traditional scheme. Figure 9 The solid line in the diagram shows the sound absorption frequency parameters of the noise reduction device 20 shown in this application. It is evident that within the noise frequency range of 200-1200Hz, the noise reduction device 20 of this application exhibits significant sound absorption and noise reduction effects, demonstrating a wide applicability and good noise reduction performance.

[0090] Secondly, embodiments of this application also provide a noise reduction control method for an air conditioner, used to control the air conditioner 100 in the first aspect, such as... Figure 10 and Figure 11 As shown, the noise reduction control method includes the following steps: Obtain the current speed of outdoor fan 12 and the predicted speed after a preset time.

[0091] Based on the current rotational speed, determine whether the preset rotational speed has changed.

[0092] If the predicted rotational speed is the same as the current rotational speed, the moving component 22 of the noise reduction device 20 is controlled to maintain its current position.

[0093] If the predicted rotational speed is different from the current rotational speed, the first position parameter of the moving component 22 is calculated based on the predicted rotational speed and the operating parameters, and the moving component 22 is controlled to move to the position corresponding to the first position parameter.

[0094] Since the noise reduction control method of the air conditioner in the second aspect is used to control the air conditioner 100 in the first aspect, it has at least all the beneficial effects brought about by the technical solution of the embodiment shown in the first aspect, which will not be repeated here.

[0095] In addition, in the steps of obtaining the current speed of the outdoor fan 12 and the predicted speed after a preset time, the control module 31 can monitor the operating status of the outdoor fan 12 in real time and obtain the current speed by reading the feedback signal of the fan drive circuit or the data of the internal sensors.

[0096] Meanwhile, the control module 31 can predict the target speed that the outdoor fan 12 will reach at a preset time point in the future (e.g., a few seconds in the future) based on the air conditioner 100's operating strategy, user settings, or environmental parameter change trends, using a built-in prediction model or algorithm. This predicted speed can be based on the air conditioner 100's internal operating program planning or can be derived by combining historical data and trend analysis.

[0097] In the step of determining whether the predicted speed has changed based on the current speed, the control module 31 compares the acquired predicted speed with the current speed. This comparison can be set with an allowable error range; that is, only when the difference between the predicted speed and the current speed exceeds a certain preset threshold is the speed considered to have undergone a substantial change and requires adjustment. If the difference is within the threshold range, the speed is considered to remain stable.

[0098] If the predicted rotational speed is determined to be the same as the current rotational speed, the moving component 22 of the noise reduction device 20 is controlled to maintain its current position. This means that the noise characteristics of the outdoor fan 12 will remain relatively stable within a preset time, without the need to adjust the noise reduction device 20. At this time, the control module 31 will send a "hold" command to the moving component 22 or not send any movement command, so that the moving component 22 maintains its current physical position, thereby avoiding unnecessary energy consumption and mechanical wear, and maintaining the existing noise reduction effect.

[0099] If the predicted rotational speed is determined to be different from the current rotational speed, the first position parameter of the moving component 22 needs to be calculated based on the predicted rotational speed and the operating parameters. The operating parameters can be obtained experimentally and pre-set in the control module 31 of the air conditioner 100, so that the corresponding noise frequency parameters can be directly obtained based on the detected rotational speed.

[0100] It should be noted that the preset parameters may also include the location parameters of the noise reduction device required for the noise frequency, and the location parameters may also be calculated through a preset functional relationship.

[0101] For example, as shown in the following formula, the operating parameters of the air conditioner 100 are used to obtain all operating speeds of the outdoor fan 12. Experiments are conducted to determine the frequency range [f1, f2] at which noise reduction is required for the outdoor fan 12 at each speed. The goal is to maximize the sum of the sound absorption coefficients Q of the noise reduction device 20 within the noise reduction frequency range [f1, f2]. The position of the extension plate 222 (i.e., the position of the moving component 22) is used as a variable, where α(f) is the sound absorption coefficient of the noise reduction device. A genetic algorithm is used to determine the optimal position of the extension plate 222 at each outdoor fan 12's corresponding speed.

[0102] .

[0103] The step of calculating the optimal position (i.e., position parameters) of the extension plate 222 can be performed within the control module 31, or the rotational speed, noise frequency, and position parameters of the outdoor fan 12 can be pre-calculated and stored in the control module 31 to form a mapping relationship. This ensures that the resonant frequency of the noise reduction device 20 can accurately match the noise characteristics at different fan speeds.

[0104] Subsequently, the control module 31 sends precise control commands to the moving component 22 (e.g., the moving component 22 consisting of a drive motor 2231, a drive gear 2232, and a drive rack 2233) based on the current position of the moving component 22, driving it to move to the target position corresponding to the first position parameter. For example, by adjusting the insertion depth of the extension plate 222 in the resonant cavity 211, the effective volume of the resonant cavity 211 or the effective length of the diameter pipe structure 212 is changed, thereby adjusting the resonant frequency to match the main noise frequency generated by the outdoor fan 12 at the predicted speed.

[0105] Through the aforementioned noise reduction control method, the air conditioner 100 can achieve predictive noise reduction of the outdoor fan 12. The system no longer passively responds to noise changes, but rather adjusts the moving component 22 of the noise reduction device 20 in advance based on the predicted speed of the outdoor fan 12, ensuring its resonant frequency matches the characteristics of the impending noise. This proactive adjustment mechanism effectively avoids noise reduction lag caused by changes in fan speed, ensuring the noise reduction device 20 is always in optimal working condition. When the fan speed is stable, the moving component 22 remains stationary, reducing unnecessary energy consumption and mechanical wear. When the fan speed is expected to change, the system can adjust the resonant frequency of the resonant cavity 211 in a timely and precise manner, thereby continuously providing efficient and stable noise reduction throughout the operation of the air conditioner 100, significantly improving the user experience.

[0106] In some embodiments, after controlling the moving component 22 to move to the corresponding position, such as Figure 11 As shown, the noise reduction control methods for air conditioners also include: Obtain the noise frequency inside the housing 11.

[0107] Obtain the noise frequency corresponding to the noise intensity being greater than the threshold in the noise parameters.

[0108] The second position parameters of the moving component 22 are calculated based on the noise frequency and operating parameters.

[0109] Control the moving component 22 to move to the position corresponding to the second position parameter.

[0110] After adjusting the position of the moving component 22 according to the rotation speed of the outdoor fan 12, the microphone 32 installed inside the housing 11 continuously collects noise parameters inside the housing 11 (especially at the air outlet 14). When the noise intensity of a certain part of the noise parameters exceeds a threshold, the corresponding noise frequency is obtained, and the corresponding second position parameter is calculated according to the mapping relationship in the operating parameters. Subsequently, the control module 31 issues a movement adjustment command based on the second position parameter and the current position of the moving component 22, so that the moving component 22 switches to the corresponding position of the second position parameter, thereby improving the noise reduction effect.

[0111] If no noise intensity exceeding the threshold is found in the noise parameters collected by microphone 32, the adjustment steps in this process can be terminated. Continue monitoring the speed change of the outdoor fan 12.

[0112] Thirdly, such as Figure 12 As shown in the figure, this application embodiment provides a control device for an air conditioner, namely a control module 31. The control module 31 includes a processor 311, a communication interface 312, a memory 313, and a communication bus 314. The processor 311, communication interface 312, and memory 313 communicate with each other via the communication bus 314. The memory 313 is used to store computer programs.

[0113] In one embodiment of this application, when the processor 311 executes the computer program stored in the memory 313, it implements the execution steps of the noise reduction control method for the air conditioner in the second aspect.

[0114] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the execution steps of the noise reduction control method for the air conditioner in the second aspect.

[0115] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0116] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0117] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A noise reduction device, characterized in that, include: A noise reduction housing, wherein the noise reduction housing is provided with at least two spaced resonant cavities along a first direction, and each resonant cavity is provided with a diameter tube structure; The height dimension of at least two of the resonant cavities increases sequentially in the second direction, and there is an angle between the first direction and the second direction; And a movable component, which is at least partially disposed within the resonant cavity for adjusting the resonant frequency of the resonant cavity.

2. The noise reduction device according to claim 1, characterized in that, The noise reduction housing includes: At least two duct plates are provided, one duct plate is provided in each of the resonant cavities, and the side plates of the resonant cavities on the same side are spaced apart from the duct plates along the first direction to form a duct structure; the length dimension of the duct structure is provided along the second direction.

3. The noise reduction device according to claim 2, characterized in that, The moving component includes: A positioning element, wherein the positioning element is located on one side of the noise reduction housing along the second direction; At least two extension plates are provided. The noise reduction housing is provided with a strip hole that connects to the resonant cavity. One end of one of the extension plates is inserted into one of the resonant cavities through the strip hole. The extension plate contacts the diameter tube plate along the first direction. The other end of the extension plate is connected to the positioning member. And a driving component, which is connected to the positioning component and is used to drive the positioning component and the extension plate to move along a third direction; the third direction, the second direction and the first direction have an included angle with each other.

4. The noise reduction device according to claim 3, characterized in that, The driving component includes: A drive motor is connected to the noise-reducing housing. A drive gear is located at the output end of the drive motor; And a drive rack, which is arranged along the third direction and connected to the positioning member, wherein the drive rack is meshed with the drive gear.

5. The noise reduction device according to claim 3, characterized in that, The noise reduction device includes: At least two sound-absorbing cottons are provided, one of which is disposed in the resonant cavity, and the sound-absorbing cottons and the diameter tube plate are located at both ends of the resonant cavity along the third direction.

6. The noise reduction device according to any one of claims 1-5, characterized in that, The noise reduction housing includes: First side panel; The second side plate is perpendicularly connected to the first side plate; Two third side plates, along a third direction, the opposite ends of the first side plate and the second side plate are sequentially connected to one of the third side plates; A partition, wherein the partition is spaced apart from the first side plate along the first direction; And a fourth side plate, which is an arc-shaped plate, wherein the first side plate, the second side plate, the two third side plates and the partition are connected to the arc-shaped plate to form at least two resonant cavities; Wherein, the dimensions of the first side plate and the partition plate along the second direction are the height dimensions of the resonant cavity, and the third direction, the second direction and the first direction have included angles with each other.

7. An air conditioner, characterized in that, include: The noise reduction device as described in any one of claims 1-6; The outdoor unit includes a housing, an outdoor fan, and an air guide ring. The housing has an air outlet. The outdoor fan is located inside the housing and faces the air outlet. The air guide ring is located inside the air outlet and connected to the housing. The air guide ring is located on the outer side of the air outlet in a radial direction away from the air outlet. The noise reduction device is connected to the inner side of the housing.

8. The air conditioner according to claim 7, characterized in that, The number of noise reduction devices is multiple, and the multiple noise reduction devices are distributed at intervals along the circumference of the air guide ring.

9. The air conditioner according to claim 7, characterized in that, The air conditioner also includes: A microphone, housed within the housing, is used to detect noise intensity; The microphone, the outdoor fan, and the moving component are electrically connected to the control module.

10. A noise reduction control method for an air conditioner, used to control the air conditioner as described in claims 7-9, characterized in that, The noise reduction control method includes: Obtain the current rotational speed of the outdoor fan and the predicted rotational speed after a preset time. Based on the current rotational speed, determine whether the preset rotational speed has changed; If the predicted rotational speed is the same as the current rotational speed, control the moving component of the noise reduction device to maintain the current position; If the predicted rotational speed is different from the current rotational speed, the first position parameter of the moving component is calculated based on the predicted rotational speed and the operating parameters, and the moving component is controlled to move to the position corresponding to the first position parameter.

11. The noise reduction control method for an air conditioner according to claim 10, characterized in that, After controlling the moving component to move to the position corresponding to the first position parameter, the noise reduction control method includes: Obtain the noise parameters inside the housing; Obtain the noise frequency corresponding to the noise intensity being greater than the threshold from the noise parameters; The second position parameter of the moving component is obtained based on the noise frequency and the operating parameters; Control the moving component to move to the position corresponding to the second position parameter.

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