Noise reduction devices and clothing processing equipment

Abstract

This invention provides a noise reduction device and a garment processing equipment. The noise reduction device includes a housing, a micro-perforated plate, a drive mechanism, and a noise reduction adjustment module. The micro-perforated plate has a plurality of micro-perforations, and a sound-absorbing cavity is defined between the micro-perforated plate and at least a portion of the inner wall of the housing. One end of the micro-perforated plate is rotatably connected to the housing along its height direction. The drive mechanism is connected to the micro-perforated plate and is used to drive the micro-perforated plate to rotate. The noise reduction adjustment module includes a noise collector and a control module. The control module is electrically connected to the noise collector and the drive mechanism, and is used to control the drive mechanism according to the noise signal collected by the noise collector. In this invention, the depth of the sound-absorbing cavity behind most of the micro-perforations in the micro-perforated plate can be adjusted for different noise conditions, thereby adapting to complex noise environments and performing targeted noise reduction to achieve the best possible noise reduction effect.

Description

Technical Field

[0001] The present invention relates to the field of noise reduction technology, and in particular to a noise reduction device and clothing treatment equipment. Background Technology

[0002] The widespread use of washing machines has brought great convenience to users, but problems such as vibration and noise during operation affect the user experience.

[0003] In related technologies, sound-absorbing cotton is usually placed inside the washing machine to reduce the noise generated during operation.

[0004] However, sound-absorbing cotton has limited noise reduction effect and cannot adapt to complex noise environments. Summary of the Invention

[0005] The present invention provides a noise reduction device and clothing processing equipment to solve the technical problem that the noise reduction effect of sound-absorbing cotton is limited in the prior art and cannot adapt to complex noise environments.

[0006] This invention discloses a noise reduction device, comprising:

[0007] Box;

[0008] A micro-perforated plate having a plurality of micro-perforations defines a sound-absorbing cavity between the micro-perforated plate and at least a portion of the inner wall of the box, and the micro-perforated plate is rotatably connected to the box at one end along the height direction of the box;

[0009] A drive mechanism is connected to the micro-perforated plate and is used to drive the micro-perforated plate to rotate.

[0010] The noise reduction adjustment module includes a noise collector and a control module. The control module is electrically connected to the noise collector and the drive mechanism. The control module is used to control the drive mechanism according to the noise signal collected by the noise collector.

[0011] Optionally, the noise reduction device further includes a noise absorption layer located within the silencing cavity, and the noise absorption layer is connected to the micro-perforated plate and / or the housing.

[0012] Optionally, the noise absorption layer includes several acoustic black hole structures;

[0013] Several of the aforementioned acoustic black hole structures are arranged in multiple rows and columns at intervals.

[0014] Optionally, the acoustic black hole structure is connected to the micro-perforated plate and the box body at both ends along the thickness direction of the micro-perforated plate, respectively;

[0015] The acoustic black hole structure is made of a stretchable material.

[0016] Optionally, the acoustic black hole structure includes a tubular outer shell and a plurality of rings disposed within the tubular outer shell, wherein the plurality of rings are arranged at intervals along the axial direction of the tubular outer shell;

[0017] The tubular outer shell is made of a first type of rubber, and the ring is made of a second type of rubber.

[0018] The hardness of the second rubber is greater than that of the first rubber;

[0019] The hardness of the second rubber is 70HA-80HA, and the hardness of the first rubber is 20HA-30HA.

[0020] Optionally, the control module is used to perform spectrum analysis on the noise signal collected by the noise collector to obtain spectrum data; select a frequency band with an amplitude greater than a set amplitude from the spectrum data as a target frequency band; and control the drive mechanism according to the target frequency band.

[0021] Optionally, the noise reduction device further includes a speaker near the connection between the micro-perforated plate and the enclosure, the speaker being electrically connected to the control module and connected to the micro-perforated plate or the enclosure;

[0022] The control module is used to generate an anti-phase noise reduction signal based on the noise signal collected by the noise collector when the target frequency band is in a preset low frequency range, and send the anti-phase noise reduction signal to the speaker so that the speaker emits an anti-phase noise reduction wave based on the anti-phase noise reduction signal.

[0023] Optionally, the control module is configured to control the drive mechanism to operate when the target frequency band is in a preset low frequency range or a first preset mid-high frequency range, and the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the enclosure is less than the maximum angle value, so that the micro-perforated plate rotates away from the inner wall of the enclosure opposite to the micro-perforated plate, until the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the enclosure is the maximum angle value;

[0024] The control module is used to control the drive mechanism to operate when the target frequency band is in the second preset mid-high frequency range and the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the box is greater than 0°, so that the micro-perforated plate rotates toward the inner wall of the box opposite to the micro-perforated plate until the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the box is 0°.

[0025] Wherein, the lower limit of the second preset high-frequency range is greater than the upper limit of the first preset high-frequency range.

[0026] Optionally, the noise reduction device further includes a first limiting mechanism and a second limiting mechanism, which are connected to the housing.

[0027] The first limiting mechanism and the second limiting mechanism are respectively located on both sides of the micro-perforated plate along the first direction, the first direction being perpendicular to the height direction of the box and perpendicular to the thickness direction of the micro-perforated plate;

[0028] The first limiting mechanism includes a first telescopic limiting member and a first driving member for driving the first telescopic limiting member to extend and retract; the second limiting mechanism includes a second telescopic limiting member and a second driving member for driving the second telescopic limiting member to extend and retract.

[0029] The first telescopic limiting member contacts the surface of the micro-perforated plate away from the anechoic cavity, and the second telescopic limiting member contacts the surface of the micro-perforated plate close to the anechoic cavity.

[0030] Optionally, the housing has a groove, and the bottom end of the micro-perforated plate is rotatably connected in the groove.

[0031] Optionally, the angle between the surface of the micro-perforated plate near the sound-absorbing cavity and the height direction of the box body is in the range of 0°-10°;

[0032] When the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the box is 0°, the distance between the surface of the micro-perforated plate near the anechoic cavity and the inner wall of the box opposite to the micro-perforated plate along the thickness direction of the micro-perforated plate is 15mm-25mm.

[0033] Optionally, the thickness of the micro-perforated plate is greater than or equal to 0.2 mm and less than or equal to 0.5 mm;

[0034] And / or, the microperforation is circular in shape, and the diameter of the microperforation is greater than or equal to 0.2 mm and less than or equal to 0.5 mm;

[0035] And / or, the micro-perforated plate is square in shape, the length of the micro-perforated plate is greater than or equal to 650 mm and less than or equal to 750 mm, and the width of the micro-perforated plate is greater than or equal to 540 mm and less than or equal to 640 mm;

[0036] And / or, the material of the micro-perforated plate is the same as the material of the box body;

[0037] And / or, the perforation rate of the micro-perforated plate is 1%-2%.

[0038] This invention also discloses a clothing processing device, which includes the noise reduction device described above.

[0039] The embodiments of the present invention have the following advantages:

[0040] The sound-absorbing cavity defined by the micro-perforated plate and at least part of the inner wall of the housing effectively reduces noise. The rotatable micro-perforated plate has a wide frequency range for noise reduction, thus effectively reducing outward-propagating noise, ensuring noise reduction for the garment processing equipment, improving the sound quality characteristics of the equipment, and enhancing the user experience. In this embodiment, the control module can control the drive mechanism based on the noise signal collected by the noise collector to adjust the angle between the surface of the micro-perforated plate near the sound-absorbing cavity and the height direction of the housing for different noise conditions. This adjusts the depth of the sound-absorbing cavity behind most of the micro-perforations in the micro-perforated plate, adapting to complex noise environments and targeting noise reduction to achieve the best possible noise reduction effect. Furthermore, the micro-perforated plate is a clean sound-absorbing structure with low sound quality and high acoustic impedance. Compared to traditional sound-absorbing cotton, it has the characteristics of high temperature resistance, resistance to high-speed airflow impact, and environmental friendliness. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the noise reduction device provided in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the micro-perforated plate in the noise reduction device provided in this embodiment of the invention;

[0043] Figure 3 This is a schematic diagram of the structure of the housing in the noise reduction device provided in this embodiment of the invention;

[0044] Figure 4 This is a schematic diagram of the structure of the micro-perforated plates at different positions in the noise reduction device provided in the embodiments of the present invention;

[0045] Figure 5 This is a schematic diagram showing the connection of the noise collector, control module, speaker, and rotation drive component in the noise reduction device provided in this embodiment of the invention.

[0046] Figure 6 This is a schematic diagram of the Helmholtz resonator provided in an embodiment of the present invention;

[0047] Figure 7 This is a cross-sectional schematic diagram of the acoustic black hole structure in the noise reduction device provided in this embodiment of the invention;

[0048] Figure 8This is a schematic diagram of the Helmholtz resonator with an acoustic black hole structure provided in an embodiment of the present invention.

[0049] Figure label:

[0050] 1-Micro-perforated plate, 11-Micro-perforation, 2-Box body, 21-Side plate, 22-Groove, 3-Rotation drive, 4-Noise collector, 5-Control module, 6-Acoustic black hole structure, 61-Tube shell, 62-Ring, 7-First limiting mechanism, 8-Speaker, 9-Silence silencing cavity. Detailed Implementation

[0051] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] The widespread use of washing machines has brought great convenience to users, but their operation also presents problems such as vibration and noise, affecting the user experience. In related technologies, sound-absorbing cotton is typically used inside the washing machine to reduce noise. However, the noise reduction effect of sound-absorbing cotton is limited and it cannot adapt to complex noise environments. To solve the above problems, embodiments of this application provide a noise reduction device and a clothing processing device, which are described in detail below.

[0053] Firstly, referring to Figures 1 to 5 The noise reduction device provided in this embodiment of the invention includes a housing 2, a micro-perforated plate 1, a driving mechanism, and a noise reduction adjustment module. The micro-perforated plate 1 has a plurality of micro-perforations 11. A sound-absorbing cavity 9 is defined between the micro-perforated plate 1 and at least a portion of the inner wall of the housing 2. One end of the micro-perforated plate 1 along the height direction of the housing 2 is rotatably connected to the housing 2. The driving mechanism is connected to the micro-perforated plate 1 and is used to drive the micro-perforated plate 1 to rotate. The noise reduction adjustment module includes a noise collector 4 and a control module 5. The control module 5 is electrically connected to the noise collector 4 and the driving mechanism. The control module 5 is used to control the driving mechanism according to the noise signal collected by the noise collector 4.

[0054] This noise reduction device can be applied to clothing processing equipment, where the housing 2 is the housing within the clothing processing equipment. The clothing processing equipment can specifically be a washing machine, dryer, washer-dryer combo, etc. The micro-perforated plate 1 is formed by creating several micro-perforations 11 with a diameter less than 1mm on a thin plate less than 1mm thick. The micro-perforated plate 1 itself is relatively thin, occupying a small amount of internal space in the clothing processing equipment. The micro-perforated plate 1 is a high acoustic impedance, low sound quality sound-absorbing element. The micro-perforated plate 1 is located inside the housing 2, spaced apart from the housing 2 along its thickness direction.

[0055] The housing 2 includes multiple side panels 21, for example, Figure 3 The housing 2 shown includes three side panels 21. The number of micro-perforated panels 1 is at least one and at most equal to the number of side panels 21. When there is only one micro-perforated panel 1, it is spaced apart from one of the side panels 21 along the thickness direction of the micro-perforated panel 1, and a sound-absorbing cavity 9 is defined between the micro-perforated panel 1 and the inner wall of the side panel 21. When there is only one micro-perforated panel 1, it can be placed in a location with high noise levels inside the clothing processing equipment. When there are three side panels 21 and three micro-perforated panels 1, the three micro-perforated panels 1 are spaced apart from the three side panels 21, and a sound-absorbing cavity 9 is defined between the three micro-perforated panels 1 and the inner wall of the three side panels 21.

[0056] The shape of the micro-perforated plate 1 is set according to different application scenarios. For example, the shape of the micro-perforated plate 1 can be square, circular, conical, elliptical, polygonal, etc. In this embodiment, the shape of the micro-perforated plate 1 is preferably square. The sound absorption performance of the micro-perforated plate 1 is not affected by the material. The material of the micro-perforated plate 1 can be metal, plastic, etc. The material of the micro-perforated plate 1 is preferably the same as the material of the housing 2. The shape of the micro-perforations 11 can be circular, elliptical, polygonal, etc. The shape of the micro-perforations 11 is preferably circular. The micro-perforations 11 are connected to the sound absorption cavity 9, and the sound waves of noise enter the sound absorption cavity 9 through the micro-perforations 11.

[0057] The sound-absorbing cavity 9 defined between the micro-perforated plate 1 and at least a portion of the inner wall of the housing 2 achieves sound absorption based on the sound absorption principle of a Helmholtz resonator. The sound absorption principle of the Helmholtz resonator is based on the phenomenon of acoustic resonance. (Refer to...) Figure 6 The structure of a Helmholtz resonator resembles a small container with a neck. When sound waves enter the container through the neck, the air inside the container and the air column in the neck form a vibrating system, similar to a spring-mass system. This system resonates at a specific frequency, known as the Helmholtz resonance frequency. In practical applications, multiple Helmholtz resonators can be used in series or parallel to increase the anechoic bandwidth and efficiency, adapting to the anechoic requirements of more complex noise environments. Figure 6 In this embodiment, d1 is equivalent to the diameter of the circular micro-perforation 11, t1 is equivalent to the thickness of the micro-perforated plate 1, and L1 is equivalent to the distance between the micro-perforation 11 and the inner wall of the box 2 opposite to the micro-perforated plate 1.

[0058] A rotating shaft can be provided at one end of the micro-perforated plate 1 along the height direction of the housing 2, and the micro-perforated plate 1 is rotatably connected to the housing 2 via the rotating shaft. The driving mechanism includes a rotating drive component 3, which can be directly connected to the rotating shaft, and the control module 5 is specifically electrically connected to the rotating drive component 3. The rotating drive component 3 can be a motor. The driving mechanism may also include a connecting shaft, in which case the rotating drive component 3 is connected to the rotating shaft via the connecting shaft. Preferably, the bottom end of the micro-perforated plate 1 along the height direction of the housing 2 is rotatably connected to the housing 2, in which case the micro-perforated plate 1 rotates around the bottom end of the micro-perforated plate 1 when rotating.

[0059] The garment processing equipment includes a motor. During operation, noise sources for the garment processing equipment include, but are not limited to, noise generated by the motor and / or noise generated by the garment processing drum. The noise collector 4 can be placed near the motor in the garment processing equipment, or it can be placed in other locations within the equipment where noise is high. The noise collector 4 is used to collect noise signals in real time, and it can be a microphone. Specifically, this microphone can be a MEMS (Micro-Electro-Mechanical Systems) microphone. The core of a MEMS microphone is a tiny diaphragm, typically made of silicon. When sound waves act on the diaphragm, it vibrates slightly. These vibrations are converted into electrical signals, which are then amplified and output.

[0060] The control module 5 can be a Digital Signal Processor (DSP), which is low-cost and has excellent noise analysis and processing capabilities. The drive mechanism can drive the micro-perforated plate 1 to rotate, thereby adjusting the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2. This allows adjustment of the maximum distance between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the inner wall of the housing 2 opposite to the micro-perforated plate 1, and consequently, the distance between most of the micro-perforations 11 in the micro-perforated plate 1 and the inner wall of the housing 2 opposite to the micro-perforated plate 1. The height direction of the housing 2 can be referenced... Figure 1 The direction indicated by arrow B in the middle.

[0061] The angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the enclosure 2 is preferably adjustable within the range of 0°-10°. When the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the enclosure 2 is 0°, that is, when the micro-perforated plate 1 is parallel to the height direction of the enclosure 2, the maximum distance between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the inner wall of the enclosure 2 opposite to the micro-perforated plate 1 is small, for example, the maximum distance is 20mm. After initial installation, the micro-perforated plate 1 is parallel to the height direction of the enclosure 2.

[0062] Reference Figure 4 After the micro-perforated plate 1 is driven by the drive mechanism to rotate away from the inner wall of the housing 2 opposite to the micro-perforated plate 1, the position of the micro-perforated plate 1 will rotate from a vertical position to an inclined position as shown by the dotted line. The angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 will increase, for example, to 5°. The maximum distance between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the inner wall of the housing 2 opposite to the micro-perforated plate 1 will increase, and the distance between most of the micro-perforations 11 in the micro-perforated plate 1 and the inner wall of the housing 2 opposite to the micro-perforated plate 1 will increase. The angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 when the micro-perforated plate 1 is tilted can be referenced... Figure 4 α is shown in the figure.

[0063] The distance between the micro-perforation 11 and the inner wall of the housing 2 opposite to the micro-perforated plate 1 is also the depth of the anechoic cavity 9 behind the micro-perforation 11. A smaller depth of the anechoic cavity 9 behind the micro-perforation 11 is suitable for mid-to-high frequency noise reduction, while a larger depth is suitable for low-frequency noise reduction. Therefore, if the noise to be absorbed is mainly concentrated in the low-frequency range, the depth of the anechoic cavity 9 behind the micro-perforation 11 can be larger. If the noise to be absorbed is mainly concentrated in the mid-to-high frequency range, the depth of the anechoic cavity 9 behind the micro-perforation 11 can be smaller.

[0064] The control module 5 can control the drive mechanism according to the noise signal collected by the noise collector 4, so as to adjust the distance between most of the micro-perforations 11 in the micro-perforated plate 1 and the inner wall of the box 2 opposite to the micro-perforated plate 1 for different noise conditions. That is, it can adjust the depth of the sound-absorbing cavity 9 behind most of the micro-perforations 11, so as to achieve targeted noise reduction and achieve the best noise reduction effect.

[0065] In this embodiment of the invention, the sound-absorbing cavity 9 defined by the micro-perforated plate 1 and at least part of the inner wall of the housing 2 can effectively reduce noise. Furthermore, the rotatable micro-perforated plate 1 has a wide frequency range for noise reduction, thereby effectively reducing outward-propagating noise, ensuring the noise reduction effect on the clothing processing equipment, improving the sound quality characteristics of the clothing processing equipment, and enhancing the user experience. In this embodiment of the invention, the control module 5 can control the drive mechanism according to the noise signal collected by the noise collector 4 to adjust the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the housing 2 for different noise conditions, thereby adjusting the depth of the sound-absorbing cavity 9 behind most of the micro-perforations 11 in the micro-perforated plate 1. This allows it to adapt to complex noise environments and perform targeted noise reduction to achieve the best possible noise reduction effect. In addition, the micro-perforated plate 1 is a clean sound-absorbing structure with low sound quality and high acoustic impedance. Compared with traditional sound-absorbing cotton, it has the characteristics of high temperature resistance, high-speed airflow impact resistance, and environmental friendliness.

[0066] In an optional embodiment of the present invention, the noise reduction device further includes a noise absorption layer located within the sound-absorbing cavity 9, and connected to the micro-perforated plate 1 and / or the housing 2. The noise absorption layer may be connected only to the micro-perforated plate 1, only to the housing 2, or simultaneously to both the micro-perforated plate 1 and the housing 2. The noise absorption layer may include an acoustic black hole structure 6, porous materials, sound-absorbing cotton, etc. By providing the noise absorption layer, the noise reduction effect can be further improved, thereby effectively reducing the noise generated during the operation of the clothing processing equipment.

[0067] In an optional embodiment of the present invention, reference is made to... Figure 4 The noise absorption layer includes several acoustic black hole structures 6; the several acoustic black hole structures 6 are arranged in multiple rows and columns at intervals.

[0068] An acoustic black hole (ABH) is a specially designed structure that efficiently absorbs sound wave energy, similar to how black holes in astronomy absorb matter and light. Acoustic black holes are typically composed of specific geometric shapes. When sound waves enter an acoustic black hole, their propagation speed gradually decreases, causing wavelength compression. This wavelength compression continues until the wave speed drops to zero, preventing the incident wave from propagating to the end of the structure. Once the sound waves enter the acoustic black hole, they are trapped and completely absorbed without any reflection, ultimately concentrating and dissipating the sound energy to achieve noise absorption. The spacing between two adjacent acoustic black hole structures 6 can be 10mm. Compared to traditional sound-absorbing materials such as sound-absorbing cotton and porous materials, the acoustic black hole structure 6 has advantages such as high efficiency in mid-to-low frequency sound absorption, higher energy dissipation rate, and multi-frequency sound absorption performance.

[0069] Reference Figure 8With the cooperation of the anechoic cavity 9 defined between the micro-perforated plate 1 and at least part of the inner wall of the box 2, and several acoustic black hole structures 6, when the sound wave passes through the micro-perforation 11, due to the viscous friction effect and damping effect of the air particles in the hole, the energy of the sound wave will be partially consumed and converted into heat energy. The remaining sound wave will pass through the micro-perforation 11 and enter the anechoic cavity 9. When the sound wave passes through the micro-perforation 11 and enters the anechoic cavity 9, the air in the anechoic cavity 9 will resonate with the air column at the micro-perforation 11, and the energy of the sound wave will be greatly dissipated. In addition, some of the sound waves entering the anechoic cavity 9 will enter the acoustic black hole structure 6, be trapped in the acoustic black hole structure 6 and be completely absorbed.

[0070] In an optional embodiment of the present invention, the acoustic black hole structure 6 is connected to the micro-perforated plate 1 and the housing 2 at both ends along the thickness direction of the micro-perforated plate 1, respectively; the acoustic black hole structure is made of a stretchable material. The connection between the acoustic black hole structure 6 and the micro-perforated plate 1 can be adhesive, and the connection between the acoustic black hole structure 6 and the housing 2 can also be adhesive. The stretchable material can be rubber, foam, etc. In this embodiment, the acoustic black hole structure 6 is made of a stretchable material, and when the micro-perforated plate 1 is rotated from a vertical position to an inclined position, most of the acoustic black hole structures 6 will correspondingly extend, thereby adapting to the rotatable micro-perforated plate 1. Figure 4 The diagram shows the elongated portion of the acoustic black hole structure 6 when the micro-perforated plate 1 is rotated from a vertical position to an inclined position. Furthermore, the elongated acoustic black hole structure 6 effectively absorbs low-frequency sound waves, thereby improving the overall noise reduction effect of the noise reduction device on low-frequency noise.

[0071] In an optional embodiment of the present invention, reference is made to... Figure 7 The acoustic black hole structure 6 includes a tubular outer shell 61 and a plurality of rings 62 disposed inside the tubular outer shell 61. The plurality of rings 62 are arranged at intervals along the axial direction of the tubular outer shell 61. The tubular outer shell 61 is made of a first rubber, and the rings 62 are made of a second rubber. The hardness of the second rubber is greater than that of the first rubber. The hardness of the second rubber is 70HA-80HA, and the hardness of the first rubber is 20HA-30HA.

[0072] The length of acoustic black hole structure 6 can be referenced. Figure 7As shown in the diagram, the length L2 of the acoustic black hole structure 6 can be 20mm-30mm. The natural length of the acoustic black hole structure 6 can be matched with the distance along the thickness direction of the micro-perforated plate 1 (near the anechoic cavity 9) and the distance between the surface of the micro-perforated plate 1 and the inner wall of the box 2 opposite to the micro-perforated plate 1 when the angle between them is 0° is 0°. Preferably, the natural length of the acoustic black hole structure 6 can be 20mm, and can be extended to a maximum of 30mm. The number of rings 62 can be 8-14. Multiple rings 62 are preferably arranged at equal intervals. The distance between two adjacent rings 62 can be 2mm. The diameter of the acoustic black hole structure 6 is specifically the inner diameter of the tubular outer shell 61. The diameter of the acoustic black hole structure 6 can be referenced... Figure 7 As shown in the figure, the diameter D1 of the acoustic black hole structure 6 can be 25mm.

[0073] The first and second rubbers are preferably hydrogenated nitrile butadiene rubber. The hardness of the second rubber can be 70HA, 73HA, 75HA, 80HA, etc., and the hardness of the first rubber can be 20HA, 22HA, 25HA, 30HA, etc. In this embodiment, the hardness of the second rubber used in the ring 62 is greater than the hardness of the first rubber used in the tubular outer shell 61. This ensures that the ring 62 is not easily swayed during the operation of the clothing processing equipment, prevents sound leakage and oil contamination, and does not affect the sound absorption effect of the acoustic black hole structure 6 when the micro-perforated plate 1 rotates.

[0074] In an optional embodiment of the present invention, the control module 5 is used to perform spectrum analysis on the noise signal collected by the noise collector 4 to obtain spectrum data; select a frequency band with an amplitude greater than a set amplitude from the spectrum data as a target frequency band; and control the drive mechanism according to the target frequency band.

[0075] Specifically, control module 5 controls the rotation drive component 3 according to the target frequency band. Noise collector 4 collects noise signals and sends them to control module 5. After receiving the noise signals, control module 5 performs spectral analysis to obtain spectral data. Spectral analysis is a technique that converts time-domain signals into frequency-domain signals. The core tool of spectral analysis is the Fourier Transform. Spectral data is the data obtained after spectral analysis of the noise signal, and it includes the amplitude distribution of signals at different frequencies. The amplitude can be set according to actual needs; this embodiment does not impose specific limitations. A frequency band refers to a range of frequencies. The target frequency band may include one or multiple frequency bands.

[0076] In an optional embodiment of the present invention, reference is made to... Figure 4 and Figure 5The noise reduction device also includes a speaker 8 near the connection between the micro-perforated plate 1 and the housing 2. The speaker 8 is electrically connected to the control module 5 and is connected to the micro-perforated plate 1 or the housing 2. The control module 5 is used to generate an anti-phase noise reduction signal based on the noise signal collected by the noise collector 4 when the target frequency band is in a preset low frequency range, and send the anti-phase noise reduction signal to the speaker 8 so that the speaker 8 emits an anti-phase noise reduction wave based on the anti-phase noise reduction signal.

[0077] The preset low-frequency range can be set according to actual needs, and this embodiment does not impose specific limitations. The control module 5, based on the signal inversion principle, performs inversion processing on the noise signal collected by the noise collector 4 to generate an inversion-phase noise reduction signal. The speaker 8 is used to convert the received electrical signal into sound waves. The inversion-phase noise reduction wave emitted by the speaker 8 can cancel out the phase of the low-frequency noise generated during the operation of the clothing processing equipment, thereby weakening the noise.

[0078] Due to the limited space within the garment processing equipment, the depth of the anechoic cavity 9 behind the micro-perforations 11 is limited, resulting in insufficient noise reduction for low-frequency noise. In this embodiment, based on the principle of active noise cancellation, the anti-phase noise reduction wave emitted by the speaker 8 can specifically reduce low-frequency noise, thereby improving the noise reduction effect for low-frequency noise.

[0079] The speaker 8 is preferably connected to the micro-perforated plate 1. When the bottom end of the micro-perforated plate 1 is rotatably connected to the enclosure 2, the speaker 8 is close to the bottom end of the micro-perforated plate 1. When the micro-perforated plate 1 is tilted, the depth of the sound-absorbing cavity 9 at the bottom end of the micro-perforated plate 1 is small, and the sound-absorbing effect on low-frequency noise is insufficient. Placing the speaker 8 close to the bottom end of the micro-perforated plate 1 can effectively improve the noise reduction effect on low-frequency noise at this position.

[0080] In an optional embodiment of the present invention, the control module 5 is used to control the drive mechanism to operate when the target frequency band is in a preset low frequency range or a first preset mid-high frequency range, and the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 is less than the maximum angle value, so that the micro-perforated plate 1 rotates away from the inner wall of the housing 2 opposite to the micro-perforated plate 1, until the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 is the maximum angle value.

[0081] The control module is used to control the drive mechanism to operate when the target frequency band is in the second preset mid-high frequency range and the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the box 2 is greater than 0°, so that the micro-perforated plate 1 rotates toward the inner wall of the box 2 opposite to the micro-perforated plate 1 until the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the box 2 is 0°, wherein the lower limit of the second preset mid-high frequency range is greater than the upper limit of the first preset mid-high frequency range.

[0082] The first and second preset mid-high frequency ranges can be set according to actual needs, and this embodiment does not impose specific limitations. The maximum angle value can be 5° or 10°. When the depth of the anechoic cavity 9 behind the micro-perforations 11 is small, it is suitable for higher mid-high frequency anechoic absorption; when the depth of the anechoic cavity 9 behind the micro-perforations 11 is large, it is suitable for low frequency or lower mid-high frequency anechoic absorption. Therefore, if the noise to be absorbed is mainly concentrated in the low frequency range or the lower mid-high frequency range, the micro-perforated plate 1 can be rotated away from the inner wall of the housing 2 opposite to the micro-perforated plate 1 to increase the depth of the anechoic cavity 9 behind the micro-perforations 11. If the noise to be absorbed is mainly concentrated in the higher mid-high frequency range, the height direction of the micro-perforated plate 1 and the housing 2 can be kept parallel. In this case, the depth of the anechoic cavity 9 behind the micro-perforations 11 is small.

[0083] In an optional embodiment of the present invention, reference is made to... Figure 1 and Figure 4 The noise reduction device also includes a first limiting mechanism 7 and a second limiting mechanism (not shown in the figure), which are connected to the housing 2. The first limiting mechanism 7 and the second limiting mechanism are located on both sides of the micro-perforated plate 1 along the first direction, which is perpendicular to the height direction of the housing 2 and perpendicular to the thickness direction of the micro-perforated plate 1.

[0084] The first limiting mechanism 7 includes a first telescopic limiting member and a first driving member for extending and retracting the first telescopic limiting member; the second limiting mechanism includes a second telescopic limiting member and a second driving member for extending and retracting the second telescopic limiting member; the first telescopic limiting member is in contact with the surface of the micro-perforated plate 1 away from the sound-absorbing cavity 9, and the second telescopic limiting member is in contact with the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9.

[0085] The first direction can be referenced. Figure 1The direction indicated by arrow A. The number of first limiting mechanisms 7 can be one, two, three, etc. The number of second limiting mechanisms can be one, two, three, etc. When there are multiple first limiting mechanisms 7 and multiple second limiting mechanisms, the multiple first limiting mechanisms 7 and multiple second limiting mechanisms can be arranged at intervals along the height direction of the housing 2. The first driving member is used to drive the extension and retraction of the first telescopic limiting member, and the second driving member is used to drive the extension and retraction of the second telescopic limiting member. The first driving member and the second driving member can be electric push rods. In this embodiment, the first limiting mechanism 7 and the second limiting mechanism can limit the micro-perforated plate 1 along its thickness direction, thereby preventing the micro-perforated plate 1 from shifting due to vibration.

[0086] The first and second driving components can be controlled by the control module 5. After initial installation, the micro-perforated plate 1 is parallel to the height direction of the housing 2. At this time, the micro-perforated plate 1 is limited along its thickness direction by the cooperation of the first and second telescopic limiting components. During the rotation of the micro-perforated plate 1 away from the inner wall of the housing 2 opposite to the micro-perforated plate 1, the first telescopic limiting component shortens accordingly, and the second telescopic limiting component extends accordingly, until the micro-perforated plate 1 stops rotating.

[0087] In an optional embodiment of the present invention, a groove 22 is provided on the housing 2, and the bottom end of the micro-perforated plate 1 is rotatably connected within the groove 22. The groove 22 defines the installation position of the micro-perforated plate 1. During installation, the micro-perforated plate 1 can be vertically inserted into the groove 22 from top to bottom. Then, the micro-perforated plate 1 is rotatably connected to the housing 2 via a rotating shaft. The connection between the rotating shaft and the micro-perforated plate 1 and the housing 2 can be detachable to facilitate the disassembly, assembly, and replacement of the micro-perforated plate 1.

[0088] In an optional embodiment of the present invention, the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the housing 2 is in the range of 0°-10°; when the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the housing 2 is 0°, the distance between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the inner wall of the housing 2 opposite to the micro-perforated plate 1 along the thickness direction of the micro-perforated plate 1 is 15mm-25mm.

[0089] The driving mechanism allows adjustment of the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2. The angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 ranges from 0° to 10°, meaning it is adjustable within this range. Preferably, the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 is 0° to 5°.

[0090] When the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 is 0°, that is, when the micro-perforated plate 1 is parallel to the height direction of the housing 2, the distance between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the inner wall of the housing 2 opposite to the micro-perforated plate 1 along the thickness direction of the micro-perforated plate 1 can be 15mm, 18mm, 20mm, 22mm, 25mm, etc. When the micro-perforated plate 1 is parallel to the height direction of the housing 2, the distance between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the inner wall of the housing 2 opposite to the micro-perforated plate 1 is preferably 20mm.

[0091] When the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 is greater than 0°, that is, when the micro-perforated plate 1 is tilted, the depth of the anechoic cavity 9 behind the micro-perforations 11 at different heights is different. The noise frequency that can be absorbed at the midpoint between the micro-perforated plate 1 and the anechoic cavity 9 can be determined according to the following empirical formula:

[0092]

[0093] Where f is the noise frequency that can be absorbed at the midpoint between the micro-perforated plate 1 and the silencing cavity 9, c is the speed of sound, d is the diameter of the circular micro-perforation 11, t is the thickness of the micro-perforated plate 1, p is the perforation rate, and h is the depth of the silencing cavity 9 behind the micro-perforation 11 at the midpoint.

[0094] According to this empirical formula, when d equals t, the micro-perforated plate 1 is vertical and not tilted, h is 20mm, and p is 1%, the noise frequency that can be absorbed at the midpoint between the micro-perforated plate 1 and the silencing cavity 9 can reach up to about 3400Hz, which can effectively reduce noise in the high-frequency band.

[0095] In an optional embodiment of the present invention, the thickness of the micro-perforated plate 1 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm; and / or, the micro-perforations 11 are circular in shape and have a diameter greater than or equal to 0.2 mm and less than or equal to 0.5 mm; and / or, the micro-perforated plate 1 is square in shape, with a length greater than or equal to 650 mm and less than or equal to 750 mm, and a width greater than or equal to 540 mm and less than or equal to 640 mm; and / or, the material of the micro-perforated plate 1 is the same as the material of the housing 2; and / or, the perforation rate of the micro-perforated plate 1 is 1%-2%.

[0096] The thickness of the micro-perforated plate 1 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc. When the micro-perforations 11 are circular, their structure is simple and easy to form. The diameter of the micro-perforations 11 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc. When the diameter of the micro-perforations 11 is within the above range, the micro-perforations 11 have a larger acoustic impedance and a smaller acoustic mass, which can significantly improve the sound absorption coefficient.

[0097] The enclosure 2 can be made of steel, such as stainless steel. When the material of the micro-perforated plate 1 is the same as that of the enclosure 2, the service life of the micro-perforated plate 1 can be improved, thus avoiding the impact on sound absorption effect after long-term use due to a short service life. The perforation rate of the micro-perforated plate 1 is the ratio of the open area of ​​the micro-perforated plate 1 to the area of ​​the surface where the holes are located. The perforation rate of the micro-perforated plate 1 is preferably 1%. The length of the micro-perforated plate 1 can be 650mm, 680mm, 700mm, 750mm, etc. The length of the micro-perforated plate 1 is preferably 700mm. The width of the micro-perforated plate 1 can be 540mm, 580mm, 590mm, 640mm, etc. The width of the micro-perforated plate 1 is preferably 590mm.

[0098] The working principle of the above noise reduction device can be summarized as follows:

[0099] After initial installation, the micro-perforated plate 1 is parallel to the height of the housing 2. During the operation of the garment processing equipment, the noise collector 4 collects noise signals and sends them to the control module 5. After receiving the noise signals, the control module 5 performs spectrum analysis on the noise signals to obtain spectrum data, and selects frequency bands with amplitudes greater than the set amplitude from the spectrum data as target frequency bands.

[0100] If the target frequency band is within the second preset mid-high frequency range, the micro-perforated plate 1 remains parallel to the height direction of the enclosure 2. If the target frequency band is within the first preset mid-high frequency range, the control module 5 controls the drive mechanism to rotate the micro-perforated plate 1 away from the inner wall of the enclosure 2 opposite to the micro-perforated plate 1, until the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the enclosure 2 reaches its maximum value.

[0101] If the target frequency band is within the preset low frequency range, the control module 5 controls the drive mechanism to rotate the micro-perforated plate 1 away from the inner wall of the housing 2 opposite to the micro-perforated plate 1, until the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the housing 2 is the maximum angle value. At the same time, the control module 5 generates an anti-phase noise reduction signal based on the noise signal collected by the noise collector 4, and sends the anti-phase noise reduction signal to the speaker 8, so that the speaker 8 emits an anti-phase noise reduction wave based on the anti-phase noise reduction signal.

[0102] Secondly, embodiments of the present invention provide a garment processing device, which includes the noise reduction device provided in the first aspect. The noise reduction device includes a housing 2, a micro-perforated plate 1, a drive mechanism, and a noise reduction adjustment module. The micro-perforated plate 1 has a plurality of micro-perforations 11, and a sound-absorbing cavity 9 is defined between the micro-perforated plate 1 and at least a portion of the inner wall of the housing 2. One end of the micro-perforated plate 1 along the height direction of the housing 2 is rotatably connected to the housing 2. The drive mechanism is connected to the micro-perforated plate 1 and is used to drive the micro-perforated plate 1 to rotate. The noise reduction adjustment module includes a noise collector 4 and a control module 5. The control module 5 is electrically connected to the noise collector 4 and the drive mechanism, and the control module 5 is used to control the drive mechanism according to the noise signal collected by the noise collector 4.

[0103] The garment processing equipment includes a garment processing drum, which is used to place and process garments. The garment processing drum is located inside the housing 2. The garment processing equipment processes garments by washing and / or drying. Specifically, the garment processing equipment can be a washing machine, dryer, washer-dryer combo, etc. Specifically, the washing machine can be a front-loading washing machine.

[0104] In this embodiment of the invention, the sound-absorbing cavity 9 defined by the micro-perforated plate 1 and at least part of the inner wall of the housing 2 can effectively reduce noise, and the frequency range of the sound absorption is relatively wide. This effectively reduces outward-propagating noise, ensuring the noise reduction effect on the clothing processing equipment, improving the sound quality characteristics of the clothing processing equipment, and enhancing the user experience. In this embodiment of the invention, the control module 5 can control the drive mechanism according to the noise signal collected by the noise collector 4 to adjust the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the housing 2 for different noise conditions. This adjusts the depth of the sound-absorbing cavity 9 behind most of the micro-perforations 11 in the micro-perforated plate 1, thereby adapting to complex noise environments and performing targeted noise reduction to achieve the best possible noise reduction effect. Furthermore, the micro-perforated plate 1 is a clean sound-absorbing structure with low sound quality and high acoustic impedance. Compared to traditional sound-absorbing cotton, it has the characteristics of high temperature resistance, high-speed airflow impact resistance, and environmental friendliness.

[0105] Optionally, the noise reduction device further includes a noise absorption layer located within the silencing cavity 9, which is connected to the micro-perforated plate 1 and / or the enclosure 2. The noise absorption layer may be connected only to the micro-perforated plate 1, only to the enclosure 2, or simultaneously to both the micro-perforated plate 1 and the enclosure 2.

[0106] Optionally, the noise absorption layer includes several acoustic black hole structures 6; the several acoustic black hole structures 6 are arranged in multiple rows and columns at intervals.

[0107] Optionally, the acoustic black hole structure 6 is connected to the micro-perforated plate and the box body at both ends along the thickness direction of the micro-perforated plate 1, respectively; the acoustic black hole structure is made of a stretchable material.

[0108] Optionally, the acoustic black hole structure 6 includes a tubular outer shell 61 and a plurality of rings 62 disposed within the tubular outer shell 61, the plurality of rings 62 being arranged at intervals along the axial direction of the tubular outer shell 61; the tubular outer shell 61 is made of a first rubber, and the rings 62 are made of a second rubber; the hardness of the second rubber is greater than the hardness of the first rubber; the hardness of the second rubber is 70HA-80HA, and the hardness of the first rubber is 20HA-30HA.

[0109] Optionally, the control module 5 is used to perform spectrum analysis on the noise signal collected by the noise collector 4 to obtain spectrum data; select frequency bands with amplitudes greater than a set amplitude from the spectrum data as target frequency bands; and control the drive mechanism according to the target frequency bands.

[0110] Optionally, the noise reduction device also includes a speaker 8 near the connection between the micro-perforated plate 1 and the enclosure 2. The speaker 8 is electrically connected to the control module 5 and is connected to the micro-perforated plate 1 or the enclosure 2. The control module 5 is used to generate an anti-phase noise reduction signal based on the noise signal collected by the noise collector 4 when the target frequency band is in a preset low frequency range, and send the anti-phase noise reduction signal to the speaker so that the speaker 8 emits an anti-phase noise reduction wave based on the anti-phase noise reduction signal.

[0111] Optionally, the control module 5 is used to control the drive mechanism to operate when the target frequency band is in a preset low frequency range or a first preset mid-high frequency range, and the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 is less than the maximum angle value, so that the micro-perforated plate 1 rotates away from the inner wall of the housing 2 opposite to the micro-perforated plate 1, until the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the housing 2 is the maximum angle value.

[0112] The control module is used to control the drive mechanism to operate when the target frequency band is in the second preset mid-high frequency range and the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the box 2 is greater than 0°, so that the micro-perforated plate 1 rotates toward the inner wall of the box 2 opposite to the micro-perforated plate 1 until the angle between the surface of the micro-perforated plate 1 near the anechoic cavity 9 and the height direction of the box 2 is 0°, wherein the lower limit of the second preset mid-high frequency range is greater than the upper limit of the first preset mid-high frequency range.

[0113] Optionally, the noise reduction device further includes a first limiting mechanism 7 and a second limiting mechanism, which are connected to the housing 2. The first limiting mechanism 7 and the second limiting mechanism are located on both sides of the micro-perforated plate 1 along a first direction, which is perpendicular to the height direction of the housing 2 and perpendicular to the thickness direction of the micro-perforated plate 1.

[0114] The first limiting mechanism 7 includes a first telescopic limiting member and a first driving member for extending and retracting the first telescopic limiting member; the second limiting mechanism includes a second telescopic limiting member and a second driving member for extending and retracting the second telescopic limiting member; the first telescopic limiting member is in contact with the surface of the micro-perforated plate 1 away from the sound-absorbing cavity 9, and the second telescopic limiting member is in contact with the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9.

[0115] Optionally, the housing 2 has a groove 22, and the bottom end of the micro-perforated plate 1 is rotatably connected within the groove 22. The groove 22 defines the installation position of the micro-perforated plate 1. During installation, the micro-perforated plate 1 can be vertically inserted into the groove 22 from top to bottom. Then, the micro-perforated plate 1 is rotatably connected to the housing 2 via a rotating shaft. The connection between the rotating shaft and the micro-perforated plate 1 and the housing 2 can be detachable to facilitate the disassembly, assembly, and replacement of the micro-perforated plate 1.

[0116] Optionally, the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the box 2 is 0°-10°; when the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the box 2 is 0°, the distance between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the inner wall of the box 2 opposite to the micro-perforated plate 1 along the thickness direction of the micro-perforated plate 1 is 15mm-25mm.

[0117] Optionally, the thickness of the micro-perforated plate 1 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm; and / or, the shape of the micro-perforations 11 is circular, and the diameter of the micro-perforations 11 is greater than or equal to 0.2 mm and less than or equal to 0.5 mm; and / or, the shape of the micro-perforated plate 1 is square, the length of the micro-perforated plate 1 is greater than or equal to 650 mm and less than or equal to 750 mm, and the width of the micro-perforated plate 1 is greater than or equal to 540 mm and less than or equal to 640 mm; and / or, the material of the micro-perforated plate 1 is the same as the material of the housing 2; and / or, the perforation rate of the micro-perforated plate 1 is 1%-2%.

[0118] After initial installation, the micro-perforated plate 1 in the garment processing equipment is parallel to the height of the housing 2. The noise reduction process during the operation of the aforementioned garment processing equipment may include:

[0119] The noise acquisition unit 4 acquires noise signals and sends the acquired noise signals to the control module 5. After receiving the noise signals, the control module 5 performs spectrum analysis on the noise signals to obtain spectrum data, and selects frequency bands with amplitudes greater than the set amplitude from the spectrum data as target frequency bands.

[0120] If the target frequency band is within the second preset mid-high frequency range, the micro-perforated plate 1 remains parallel to the height direction of the enclosure 2. If the target frequency band is within the first preset mid-high frequency range, the control module 5 controls the drive mechanism to rotate the micro-perforated plate 1 away from the inner wall of the enclosure 2 opposite to the micro-perforated plate 1, until the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the enclosure 2 reaches its maximum value.

[0121] If the target frequency band is within the preset low frequency range, the control module 5 controls the drive mechanism to rotate the micro-perforated plate 1 away from the inner wall of the housing 2 opposite to the micro-perforated plate 1, until the angle between the surface of the micro-perforated plate 1 near the sound-absorbing cavity 9 and the height direction of the housing 2 is the maximum angle value. At the same time, the control module 5 generates an anti-phase noise reduction signal based on the noise signal collected by the noise collector 4, and sends the anti-phase noise reduction signal to the speaker 8, so that the speaker 8 emits an anti-phase noise reduction wave based on the anti-phase noise reduction signal.

[0122] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0123] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0124] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0125] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

[0126] The noise reduction device and clothing processing equipment provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the structure and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A noise reduction device, characterized in that, include: Box; A micro-perforated plate having a plurality of micro-perforations defines a sound-absorbing cavity between the micro-perforated plate and at least a portion of the inner wall of the box, and the micro-perforated plate is rotatably connected to the box at one end along the height direction of the box; A drive mechanism is connected to the micro-perforated plate and is used to drive the micro-perforated plate to rotate. A noise reduction adjustment module includes a noise collector and a control module. The control module is electrically connected to the noise collector and the drive mechanism. The control module is used to control the drive mechanism according to the noise signal collected by the noise collector. The control module is used to perform spectrum analysis on the noise signal collected by the noise collector to obtain spectrum data; select frequency bands with amplitudes greater than a set amplitude from the spectrum data as target frequency bands; and control the drive mechanism according to the target frequency bands. The control module is used to control the drive mechanism to operate when the target frequency band is in a preset low frequency range or a first preset mid-high frequency range, and the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the box is less than the maximum angle value, so that the micro-perforated plate rotates away from the inner wall of the box opposite to the micro-perforated plate, until the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the box is the maximum angle value; The control module is used to control the drive mechanism to operate when the target frequency band is in the second preset mid-high frequency range and the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the box is greater than 0°, so that the micro-perforated plate rotates toward the inner wall of the box opposite to the micro-perforated plate until the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the box is 0°. Wherein, the lower limit of the second preset high-frequency range is greater than the upper limit of the first preset high-frequency range.

2. The noise reduction device according to claim 1, characterized in that, The noise reduction device further includes a noise absorption layer located within the silencing cavity, and the noise absorption layer is connected to the micro-perforated plate and / or the housing.

3. The noise reduction device according to claim 2, characterized in that, The noise absorption layer includes several acoustic black hole structures; Several of the aforementioned acoustic black hole structures are arranged in multiple rows and columns at intervals.

4. The noise reduction device according to claim 3, characterized in that, The acoustic black hole structure is connected to the micro-perforated plate and the box body at both ends along the thickness direction of the micro-perforated plate, respectively. The acoustic black hole structure is made of a stretchable material.

5. The noise reduction device according to claim 4, characterized in that, The acoustic black hole structure includes a tubular outer shell and a plurality of rings disposed within the tubular outer shell, the plurality of rings being arranged at intervals along the axial direction of the tubular outer shell; The tubular outer shell is made of a first type of rubber, and the ring is made of a second type of rubber. The hardness of the second rubber is greater than that of the first rubber; The hardness of the second rubber is 70HA-80HA, and the hardness of the first rubber is 20HA-30HA.

6. The noise reduction device according to claim 1, characterized in that, The noise reduction device also includes a speaker near the connection between the micro-perforated plate and the enclosure, the speaker being electrically connected to the control module and connected to the micro-perforated plate or the enclosure; The control module is used to generate an anti-phase noise reduction signal based on the noise signal collected by the noise collector when the target frequency band is in a preset low frequency range, and send the anti-phase noise reduction signal to the speaker so that the speaker emits an anti-phase noise reduction wave based on the anti-phase noise reduction signal.

7. The noise reduction device according to claim 1, characterized in that, The noise reduction device further includes a first limiting mechanism and a second limiting mechanism, which are connected to the housing. The first limiting mechanism and the second limiting mechanism are respectively located on both sides of the micro-perforated plate along the first direction, the first direction being perpendicular to the height direction of the box and perpendicular to the thickness direction of the micro-perforated plate; The first limiting mechanism includes a first telescopic limiting member and a first driving member for driving the first telescopic limiting member to extend and retract; the second limiting mechanism includes a second telescopic limiting member and a second driving member for driving the second telescopic limiting member to extend and retract. The first telescopic limiting member contacts the surface of the micro-perforated plate away from the anechoic cavity, and the second telescopic limiting member contacts the surface of the micro-perforated plate close to the anechoic cavity.

8. The noise reduction device according to claim 1, characterized in that, The box body has a groove, and the bottom end of the micro-perforated plate is rotatably connected in the groove.

9. The noise reduction device according to claim 1, characterized in that, The angle between the surface of the micro-perforated plate near the sound-absorbing cavity and the height direction of the box body ranges from 0° to 10°. When the angle between the surface of the micro-perforated plate near the anechoic cavity and the height direction of the box is 0°, the distance between the surface of the micro-perforated plate near the anechoic cavity and the inner wall of the box opposite to the micro-perforated plate along the thickness direction of the micro-perforated plate is 15mm-25mm.

10. The noise reduction device according to claim 1, characterized in that, The thickness of the micro-perforated plate is greater than or equal to 0.2 mm and less than or equal to 0.5 mm. And / or, the microperforation is circular in shape, and the diameter of the microperforation is greater than or equal to 0.2 mm and less than or equal to 0.5 mm; And / or, the micro-perforated plate is square in shape, the length of the micro-perforated plate is greater than or equal to 650 mm and less than or equal to 750 mm, and the width of the micro-perforated plate is greater than or equal to 540 mm and less than or equal to 640 mm; And / or, the material of the micro-perforated plate is the same as the material of the box body; And / or, the perforation rate of the micro-perforated plate is 1%-2%.

11. A garment processing device, characterized in that, Includes the noise reduction device as described in any one of claims 1 to 10.

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