Noise reduction device and clothes treatment equipment

Abstract

The embodiment of the invention provides a noise reduction device and clothes treatment equipment, the noise reduction device comprises a box body, a micro-perforated plate, a driving mechanism and a noise reduction adjusting module, the micro-perforated plate is provided with a plurality of micro-perforations, and a noise elimination cavity is defined between the micro-perforated plate and at least part of the inner wall of the box body; the end, in the height direction of the box body, of the micro-perforated plate is rotationally connected to the box body, and the driving mechanism is connected with the micro-perforated plate and used for driving the micro-perforated plate to rotate. The noise reduction adjusting module comprises a noise collector and a control module, the control module is electrically connected with the noise collector and the driving mechanism, and the control module is used for controlling the driving mechanism according to noise signals collected by the noise collector. In the embodiment of the invention, the depths of the silencing cavities at the backs of most micro-perforations in the micro-perforated plate can be adjusted according to different noise conditions, so that the micro-perforated plate can adapt to a complex noise environment, noise reduction is performed in a targeted manner, and the optimal noise reduction effect is achieved as far as possible.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of noise reduction, and in particular to a noise reduction device and a clothing processing equipment. Background Art

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

[0003] In the related art, in order to reduce the noise generated during the operation of a washing machine, a method of sticking sound-absorbing cotton inside the washing machine is usually adopted.

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

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

[0006] The embodiment of the present invention discloses a noise reduction device, comprising:

[0007] Box;

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

[0009] A driving mechanism, connected to the micro-perforated plate and used to drive the micro-perforated plate to rotate;

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

[0011] Optionally, the noise reduction device further comprises a noise absorbing layer, wherein the noise absorbing layer is located in the sound-absorbing cavity, and the noise absorbing layer is connected to the micro-perforated plate and / or the box body.

[0012] Optionally, the noise absorbing layer includes a plurality of acoustic black hole structures;

[0013] The acoustic black hole structures are arranged in multiple rows and columns at intervals.

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

[0015] The material of the acoustic black hole structure is a retractable material.

[0016] Optionally, the acoustic black hole structure comprises a tubular shell and a plurality of circular rings arranged in the tubular shell, wherein the plurality of circular rings are arranged at intervals along the axial direction of the tubular shell;

[0017] The material of the tubular shell is a first rubber, and the material of the ring is a second rubber;

[0018] The hardness of the second rubber is greater than the hardness 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 driving mechanism according to the target frequency band.

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

[0022] The control module is used to generate an anti-phase noise reduction signal according to 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 according to the anti-phase noise reduction signal.

[0023] Optionally, the control module is used to control the driving mechanism to operate so that the micro-perforated plate rotates away from the inner wall of the box body opposite to the micro-perforated plate when the target frequency band is in a preset low frequency range or a first preset medium and high frequency range and the angle between the surface of the micro-perforated plate close to the silencing cavity and the height direction of the box body is less than a maximum angle value, until the angle between the surface of the micro-perforated plate close to the silencing cavity and the height direction of the box body reaches a maximum angle value;

[0024] The control module is used to control the driving mechanism to operate when the target frequency band is in the second preset medium and high frequency range and the angle between the surface of the micro-perforated plate close to the silencing 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 close to the silencing cavity and the height direction of the box is 0°;

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

[0026] Optionally, the noise reduction device further includes a first limiting mechanism and a second limiting mechanism, and the first limiting mechanism and the second limiting mechanism are connected to the box body;

[0027] The first limiting mechanism and the second limiting mechanism are respectively located on both sides of the micro-perforated plate along a first direction, the first direction is perpendicular to the height direction of the box, and the first direction is 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 driving the first telescopic limiting member to extend and retract, and the second limiting mechanism includes a second telescopic limiting member and a second driving member driving the second telescopic limiting member to extend and retract;

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

[0030] Optionally, a groove is provided on the box body, 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 close to the muffler cavity and the height direction of the box body ranges from 0° to 10°;

[0032] When the angle between the surface of the micro-perforated plate close to the silencer cavity and the height direction of the box is 0°, along the thickness direction of the micro-perforated plate, the distance between the surface of the micro-perforated plate close to the silencer cavity and the inner wall of the box opposite to 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 shape of the micro-perforation is circular, and the diameter of the micro-perforation 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 that of the box body;

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

[0038] An embodiment of the present invention further discloses a clothes processing device, which includes the noise reduction device as 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 the micro-perforated plate and at least part of the inner wall of the box can effectively reduce noise, and the frequency range of the sound absorption of the rotatable micro-perforated plate is relatively wide, so that the noise propagating outward can be effectively reduced, the noise reduction effect on the clothing processing equipment is ensured, the sound quality characteristics of the clothing processing equipment are improved, and the user's experience is improved. In the embodiment of the present invention, the control module can control the driving mechanism according to the noise signal collected by the noise collector to adjust the angle between the surface of the micro-perforated plate close to the sound-absorbing cavity and the height direction of the box according to different noise conditions, so as to adjust the depth of the sound-absorbing cavity behind most of the micro-perforations in the micro-perforated plate, so as to adapt to complex noise environments and carry out targeted noise reduction to achieve the best noise reduction effect as much as possible. In addition, the micro-perforated plate is a clean sound-absorbing structure with low sound quality and high sound resistance. Compared with traditional sound-absorbing cotton, it has the characteristics of high temperature resistance, high-speed airflow impact resistance, and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0042] Figure 2 A schematic diagram of the structure of a micro-perforated plate in a noise reduction device provided in an embodiment of the present invention;

[0043] Figure 3 It is a structural schematic diagram of a box in the noise reduction device provided in an embodiment of the present invention;

[0044] Figure 4 Schematic diagram of the structure of micro-perforated plates at different positions in the noise reduction device provided in an embodiment of the present invention;

[0045] Figure 5 A schematic diagram of the connection between a noise collector, a control module, a speaker, and a rotating drive member in the noise reduction device provided in an embodiment of the present invention;

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

[0047] Figure 7 A schematic cross-sectional view of an acoustic black hole structure in a noise reduction device provided in an embodiment of the present invention;

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

[0049] Reference numerals:

[0050] 1-micro-perforated plate, 11-micro-perforation, 2-box, 21-side plate, 22-groove, 3-rotating drive member, 4-noise collector, 5-control module, 6-acoustic black hole structure, 61-tubular shell, 62-ring, 7-first limiting mechanism, 8-speaker, 9-noise-absorbing cavity. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] The popularity of washing machines has brought great convenience to users, but there are problems such as vibration and noise during their operation, which affect the user experience. In the related art, in order to reduce the noise generated during the operation of the washing machine, it is usually adopted to stick sound-absorbing cotton inside the washing machine. However, the noise reduction effect of the sound-absorbing cotton is limited, and it cannot adapt to complex noise environments. In order to solve the above problems, the embodiments of the present application provide a noise reduction device and a clothing processing device. The above-mentioned noise reduction device and clothing processing device are described in detail below.

[0053] First, refer to Figures 1 to 5 The noise reduction device provided by the embodiment of the present invention includes a box body 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 part of the inner wall of the box body 2. One end of the micro-perforated plate 1 along the height direction of the box body 2 is rotatably connected to the box body 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] Among them, the noise reduction device can be applied to clothing processing equipment, in which case the housing 2 is a housing in the clothing processing equipment. The clothing processing equipment may specifically be a washing machine, a dryer, a washer-dryer, etc. The micro-perforated plate 1 is formed by opening a plurality of micro-perforations 11 with a diameter less than 1 mm on a thin plate with a thickness less than 1 mm. The micro-perforated plate 1 itself has a small thickness and occupies a small internal space of the clothing processing equipment. The micro-perforated plate 1 is a sound-absorbing element with high acoustic resistance and low acoustic mass. The micro-perforated plate 1 is located on the inner side of the housing 2, and the micro-perforated plate 1 is spaced apart from the housing 2 along the thickness direction of the micro-perforated plate 1.

[0055] The box body 2 includes a plurality of side panels 21, for example, Figure 3 The box body 2 shown in the figure includes three side panels 21. The number of microperforated plates 1 is at least one and at most equal to the number of side panels 21. When the number of microperforated plates 1 is one, the microperforated plate 1 and one of the side panels 21 are spaced apart along the thickness direction of the microperforated plate 1, and a sound-absorbing cavity 9 is defined between the microperforated plate 1 and the inner wall of the side panel 21. When the number of microperforated plates 1 is one, the microperforated plate 1 can be arranged at a location with high noise inside the clothing processing device. When the number of side panels 21 and microperforated plates 1 are both three, three microperforated plates 1 are spaced apart from the three side panels 21, respectively, and a sound-absorbing cavity 9 is defined between the three microperforated plates 1 and the inner walls of the three side panels 21, respectively.

[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 the present embodiment, the shape of the micro-perforated plate 1 is preferably square. The sound-absorbing 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 box 2. The shape of the micro-perforation 11 can be circular, elliptical, polygonal, etc. The shape of the micro-perforation 11 is preferably circular. The micro-perforation 11 is connected to the sound-absorbing cavity 9, and the sound waves of the noise enter the sound-absorbing cavity 9 through the micro-perforation 11.

[0057] The micro-perforated plate 1 and the muffler cavity 9 defined between the micro-perforated plate 1 and at least part of the inner wall of the box 2 achieve muffler based on the muffler principle of a Helmholtz resonator. The muffler principle of a Helmholtz resonator is based on the acoustic resonance phenomenon. Figure 6 The structure of the Helmholtz resonator is similar to a small container with a neck. When the sound wave enters the container through the neck, the air in the container forms a vibration system with the air column in the neck, similar to a spring-mass system. This system will resonate at a specific frequency, which is called the Helmholtz resonance frequency. In practical applications, multiple Helmholtz resonators can be used in series or in parallel to increase the silencing bandwidth and efficiency to meet the silencing needs of more complex noise environments. Figure 6 In the figure, d1 is equivalent to the diameter of the circular micro-perforation 11 in this embodiment, t1 is equivalent to the thickness of the micro-perforated plate 1 in this embodiment, and L1 is equivalent to the distance between the micro-perforation 11 and the inner wall of the box body 2 opposite to the micro-perforated plate 1 in this embodiment.

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

[0059] The clothing processing device includes a power motor. During the operation of the clothing processing device, the noise sources of the clothing processing device include but are not limited to the noise generated by the power motor and / or the noise generated by the clothing processing tube. The noise collector 4 can be arranged near the power motor in the clothing processing device, or the noise collector 4 can be arranged at other locations with high noise in the clothing processing device. The noise collector 4 is used to collect noise signals in real time, and the noise collector 4 can be a microphone. The microphone can specifically be a MEMS (Micro-Electro-Mechanical Systems) microphone. The core of the MEMS microphone is a tiny vibration membrane, usually made of silicon material. When sound waves act on the vibration membrane, the vibration membrane will vibrate slightly. These vibrations are converted into electrical signals and output through subsequent amplification circuits.

[0060] The control module 5 can be a digital signal processor (DSP), which has low cost and better noise analysis and processing capabilities. The driving mechanism can drive the micro-perforated plate 1 to rotate, so that the angle between the surface of the micro-perforated plate 1 close to the muffler cavity 9 and the height direction of the box 2 can be adjusted, and then the maximum distance between the surface of the micro-perforated plate 1 close to the muffler cavity 9 and the inner wall of the box 2 opposite to the micro-perforated plate 1 can be adjusted, and then 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 can be adjusted. The height direction of the box 2 can refer to Figure 1 The arrow in B shows the direction.

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

[0062] Reference Figure 4 After the driving mechanism drives the micro-perforated plate 1 to rotate in a direction away from the inner wall of the box 2 opposite to the micro-perforated plate 1, the position of the micro-perforated plate 1 will rotate from the vertical position to the inclined position at the dotted line, and the angle between the surface of the micro-perforated plate 1 close to the muffler cavity 9 and the height direction of the box 2 will increase, for example, it will increase to 5°, the maximum distance between the surface of the micro-perforated plate 1 close to the muffler cavity 9 and the inner wall of the box 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 box 2 opposite to the micro-perforated plate 1 will increase. Among them, when the micro-perforated plate 1 is tilted, the angle between the surface of the micro-perforated plate 1 close to the muffler cavity 9 and the height direction of the box 2 can be referred to Figure 4 α shown in .

[0063] The distance between the micro-perforation 11 and the inner wall of the box body 2 opposite to the micro-perforated plate 1 is the depth of the sound-absorbing cavity 9 behind the micro-perforation 11. When the depth of the sound-absorbing cavity 9 behind the micro-perforation 11 is small, it is suitable for medium and high frequency sound absorption, and when the depth of the sound-absorbing cavity 9 behind the micro-perforation 11 is large, it is suitable for low frequency sound absorption. Therefore, if the noise to be absorbed is mainly concentrated in the low frequency range, the depth of the sound-absorbing cavity 9 behind the micro-perforation 11 can be made larger. If the noise to be absorbed is mainly concentrated in the medium and high frequency range, the depth of the sound-absorbing cavity 9 behind the micro-perforation 11 can be made smaller.

[0064] The control module 5 can control the driving mechanism according to the noise signal collected by the noise collector 4 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 according to different noise conditions, that is, to adjust the depth of the silencer cavity 9 behind most of the micro-perforations 11, so as to achieve targeted noise reduction and achieve the best noise reduction effect as much as possible.

[0065] In the embodiment of the present invention, the sound-absorbing cavity 9 defined by the micro-perforated plate 1 and at least part of the inner wall of the micro-perforated plate 1 and the housing 2 can effectively reduce noise, and the frequency range of the sound-absorbing of the rotatable micro-perforated plate 1 is relatively wide, so that the noise propagating outward can be effectively reduced, the noise reduction effect on the clothing processing equipment is ensured, the sound quality characteristics of the clothing processing equipment are improved, and the user's experience is improved. In the embodiment of the present invention, the control module 5 can control the driving mechanism according to the noise signal collected by the noise collector 4, so as to adjust the angle between the surface of the micro-perforated plate 1 close to the sound-absorbing cavity 9 and the height direction of the housing 2 according to different noise conditions, so as to adjust the depth of the sound-absorbing cavity 9 behind most of the micro-perforations 11 in the micro-perforated plate 1, so as to adapt to complex noise environments, carry out targeted noise reduction, and achieve the best noise reduction effect as much as possible. In addition, the micro-perforated plate 1 is a clean sound-absorbing structure with low sound quality and high sound resistance. Compared with traditional sound-absorbing cotton, it has the characteristics of high temperature resistance, high-speed airflow impact resistance, and environmental protection.

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

[0067] In an alternative embodiment of the present invention, referring to Figure 4 The noise absorbing layer includes a plurality of acoustic black hole structures 6; the plurality of acoustic black hole structures 6 are arranged in multiple rows and columns.

[0068] Among them, the acoustic black hole (ABH) is a specially designed structure that can efficiently absorb sound wave energy, similar to the black hole in astronomy that absorbs matter and light. Acoustic black holes are usually composed of a specific geometric shape. When sound waves enter the acoustic black hole, their propagation speed will gradually decrease, resulting in a shortened wavelength, and this wavelength compression phenomenon will continue until the wave speed drops to zero, making it impossible for the incident wave to propagate to the end of the structure. Once the sound wave enters the acoustic black hole, it will be trapped and completely absorbed, without any reflection, and the sound energy will eventually be concentrated and dissipated to achieve the effect of absorbing noise. The spacing between two adjacent acoustic black hole structures 6 can be 10mm. Compared with traditional sound-absorbing materials such as sound-absorbing cotton and porous materials, the acoustic black hole structure 6 has the advantages of efficient medium and low frequency sound absorption capacity, higher energy dissipation rate, and multi-band sound absorption performance.

[0069] Reference Figure 8With the cooperation of the micro-perforated plate 1, the silencing cavity 9 defined between the micro-perforated plate 1 and at least part of the inner wall of the box body 2, and a plurality of acoustic black hole structures 6, when the sound wave passes through the micro-perforations 11, due to the viscous friction effect and damping effect of the air particles in the holes, the energy of the sound wave will be partially consumed and converted into heat energy, and the remaining sound wave will pass through the micro-perforations 11 into the silencing cavity 9. When the sound wave passes through the micro-perforations 11 into the silencing cavity 9, the air in the silencing cavity 9 will resonate with the air column at the micro-perforations 11, and the energy of the sound wave will be greatly dissipated. In addition, part of the sound wave entering the silencing 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 two ends of the acoustic black hole structure 6 along the thickness direction of the micro-perforated plate 1 are respectively connected to the micro-perforated plate 1 and the box body 2; the material of the acoustic black hole structure is a retractable material. Among them, the connection method of the acoustic black hole structure 6 and the micro-perforated plate 1 can be bonding, and the connection method of the acoustic black hole structure 6 and the box body 2 can be bonding. The retractable material can be rubber, foam, etc. In this embodiment, the material of the acoustic black hole structure 6 is a retractable material. 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 extend accordingly, so that they can adapt to the rotatable micro-perforated plate 1. Figure 4 FIG. 3 shows the extended portion of the acoustic black hole structure 6 when the micro-perforated plate 1 is rotated from a vertical position to an inclined position. In addition, after the acoustic black hole structure 6 is extended, it can effectively absorb low-frequency sound waves, thereby improving the noise reduction effect of the entire noise reduction device on low-frequency noise.

[0071] In an alternative embodiment of the present invention, referring to Figure 7 The acoustic black hole structure 6 includes a tubular shell 61 and a plurality of circular rings 62 arranged in the tubular shell 61, and the plurality of circular rings 62 are arranged at intervals along the axial direction of the tubular shell 61; the material of the tubular shell 61 is a first rubber, and the material of the circular rings 62 is 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.

[0072] Among them, the length of the acoustic black hole structure 6 can be referred to Figure 7L2 shown in the figure, the length L2 of the acoustic black hole structure 6 can be 20mm-30mm. The length of the acoustic black hole structure 6 in the natural state can match the distance between the surface of the microperforated plate 1 close to the silencer cavity 9 and the inner wall of the box 2 opposite to the microperforated plate 1 along the thickness direction of the microperforated plate 1 when the angle between the surface of the microperforated plate 1 close to the silencer cavity 9 and the height direction of the box 2 is 0°. Preferably, the length of the acoustic black hole structure 6 in the natural state can be 20mm, and can be stretched 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 shell 61, and the diameter of the acoustic black hole structure 6 can refer to Figure 7 As shown in FIG. 1 , the diameter D1 of the acoustic black hole structure 6 may be 25 mm.

[0073] The first rubber and the second rubber are preferably hydrogenated nitrile 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 shell 61, which can ensure that the ring 62 is not easy to swing during the operation of the clothing processing device, and can prevent sound leakage and oil pollution from entering, and will 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 driving mechanism according to the target frequency band.

[0075] Among them, the control module 5 is specifically used to control the rotating drive member 3 according to the target frequency band. The noise collector 4 collects the noise signal and sends the collected noise signal to the control module 5. After receiving the noise signal, the control module 5 performs spectrum analysis on the noise signal to obtain spectrum data. Spectral analysis is a technology that converts time domain signals into frequency domain signals. The core tool of spectrum analysis is Fourier Transform. Spectral data is data obtained after spectrum analysis of the noise signal, and the spectrum data includes the amplitude distribution of signals of different frequencies. The set amplitude can be set according to actual needs, and this embodiment does not make specific limitations. Frequency band refers to an interval segment of the frequency range. The target frequency band can include one frequency band or multiple frequency bands.

[0076] In an alternative embodiment of the present invention, referring 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 box 2, the speaker 8 is electrically connected to the control module 5, and the speaker 8 is connected to the micro-perforated plate 1 or the box 2; the control module 5 is used to generate an anti-phase noise reduction signal according to 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 according to the anti-phase noise reduction signal.

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

[0078] Since the space in the clothes processing device is limited, the depth of the muffler cavity 9 behind the micro-perforations 11 is limited, and the muffler effect on low-frequency noise is obviously insufficient. In this embodiment, based on the active noise reduction principle, the anti-phase noise reduction wave emitted by the speaker 8 can specifically reduce the noise in the low-frequency band, thereby improving the noise reduction effect on the low-frequency band noise.

[0079] The loudspeaker 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 box body 2, the loudspeaker 8 is close to the bottom end of the micro-perforated plate 1. After the micro-perforated plate 1 is tilted, the depth of the silencing cavity 9 at the bottom end of the micro-perforated plate 1 is small, and the silencing effect on low-frequency noise is insufficient. Arranging the loudspeaker 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 operation of the driving mechanism when the target frequency band is in a preset low frequency range or a first preset medium and high frequency range, and the angle between the surface of the microperforated plate 1 close to the silencer cavity 9 and the height direction of the box 2 is less than the maximum angle value, so that the microperforated plate 1 rotates in a direction away from the inner wall of the box 2 opposite to the microperforated plate 1 until the angle between the surface of the microperforated plate 1 close to the silencer cavity 9 and the height direction of the box 2 reaches the maximum angle value.

[0081] The control module is used to control the operation of the driving mechanism 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 close to the silencer 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 close to the silencer cavity 9 and the height direction of the box 2 is 0°, wherein the lower limit value of the second preset mid-high frequency range is greater than the upper limit value of the first preset mid-high frequency range.

[0082] Among them, the first preset mid-high frequency range and the second preset mid-high frequency range can be set according to actual needs, and the present embodiment does not make specific limitations. The maximum angle value can be 5° or 10°. When the depth of the muffler cavity 9 behind the microperforation 11 is small, it is suitable for higher mid-high frequency muffler. When the depth of the muffler cavity 9 behind the microperforation 11 is large, it is suitable for low frequency or lower mid-high frequency muffler. Therefore, if the noise to be absorbed is mainly concentrated in the low frequency range or the lower mid-high frequency range, the microperforated plate 1 can be rotated in the direction away from the inner wall of the box 2 opposite to the microperforated plate 1 to increase the depth of the muffler cavity 9 behind the microperforation 11. If the noise to be absorbed is mainly concentrated in the higher mid-high frequency range, the microperforated plate 1 is kept parallel to the height direction of the box 2. At this time, the depth of the muffler cavity 9 behind the microperforation 11 is small.

[0083] In an alternative embodiment of the present invention, referring 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 box body 2; the first limiting mechanism 7 and the second limiting mechanism are respectively located on both sides of the micro-perforated plate 1 along the first direction, the first direction is perpendicular to the height direction of the box body 2, and the first direction is 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 driving the first telescopic limiting member to be extended or retracted, and the second limiting mechanism includes a second telescopic limiting member and a second driving member driving the second telescopic limiting member to be extended or retracted; the first telescopic limiting member contacts the surface of the micro-perforated plate 1 away from the silencer cavity 9, and the second telescopic limiting member contacts the surface of the micro-perforated plate 1 close to the silencer cavity 9.

[0085] The first direction can refer to Figure 1The direction indicated by the arrow A. The number of the first limiting mechanisms 7 can be one, two, three, etc. The number of the second limiting mechanisms can be one, two, three, etc. When the number of the first limiting mechanisms 7 and the second limiting mechanisms is multiple, the multiple first limiting mechanisms 7 and the multiple second limiting mechanisms can be arranged at intervals along the height direction of the box body 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 micro-perforated plate 1 can be limited along its thickness direction by the first limiting mechanism 7 and the second limiting mechanism, so as to prevent the micro-perforated plate 1 from shifting due to vibration.

[0086] The first driving member and the second driving member can be controlled by the control module 5. After the initial installation, the micro-perforated plate 1 is parallel to the height direction of the box body 2. At this time, the micro-perforated plate 1 is limited along its thickness direction under the cooperation of the first telescopic limiter and the second telescopic limiter. During the rotation of the micro-perforated plate 1 in the direction away from the inner wall of the box body 2 opposite to the micro-perforated plate 1, the first telescopic limiter is shortened accordingly and the second telescopic limiter is extended 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 box body 2, and the bottom end of the micro-perforated plate 1 is rotatably connected in the groove 22. The groove 22 is used to define the installation position of the micro-perforated plate 1. When the micro-perforated plate 1 is installed, the micro-perforated plate 1 can be vertically inserted into the groove 22 from top to bottom, and then the micro-perforated plate 1 is rotatably connected to the box body 2 through the rotating shaft. The connection between the rotating shaft and the micro-perforated plate 1 and the box body 2 can be a detachable connection to facilitate the disassembly 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 close to the silencer cavity 9 and the height direction of the box body 2 is in the range of 0°-10°; when the angle between the surface of the micro-perforated plate 1 close to the silencer cavity 9 and the height direction of the box body 2 is 0°, along the thickness direction of the micro-perforated plate 1, the distance between the surface of the micro-perforated plate 1 close to the silencer cavity 9 and the inner wall of the box body 2 opposite to the micro-perforated plate 1 is 15mm-25mm.

[0089] Among them, the angle between the surface of the micro-perforated plate 1 close to the muffler cavity 9 and the height direction of the box 2 can be adjusted by the driving mechanism. The angle between the surface of the micro-perforated plate 1 close to the muffler cavity 9 and the height direction of the box 2 is in the range of 0°-10°, that is, the angle between the surface of the micro-perforated plate 1 close to the muffler cavity 9 and the height direction of the box 2 is adjustable in the range of 0°-10°. The angle between the surface of the micro-perforated plate 1 close to the muffler cavity 9 and the height direction of the box 2 is preferably in the range of 0°-5°.

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

[0091] When the angle between the surface of the micro-perforated plate 1 close to the silencing cavity 9 and the height direction of the box 2 is greater than 0°, that is, when the micro-perforated plate 1 is tilted, the depths of the silencing cavity 9 behind the micro-perforations 11 at different heights are different. The noise frequency that can be absorbed by the middle position of the micro-perforated plate 1 and the silencing cavity 9 can be determined according to the following empirical formula:

[0092]

[0093] Among them, f is the noise frequency that can be absorbed by the middle position of the micro-perforated plate 1 and the sound-absorbing 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 sound-absorbing cavity 9 behind the micro-perforation 11 at the middle position.

[0094] According to the empirical formula, when d is equal to t, the micro-perforated plate 1 is vertically not tilted, h is 20 mm, and p is 1%, the noise frequency that can be absorbed by the middle position of the micro-perforated plate 1 and the sound-absorbing cavity 9 can reach up to about 3400 Hz, 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 shape of the micro-perforation 11 is circular, and the diameter of the micro-perforation 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 that of the box 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 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. When the shape of the micro-perforation 11 is circular, its structure is simple and easy to form. The diameter of the micro-perforation 11 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. When the diameter of the micro-perforation 11 is within the above range, the micro-perforation 11 has a larger acoustic resistance and a smaller acoustic mass, which can significantly improve the sound absorption coefficient.

[0097] The material of the box body 2 can be steel, such as stainless steel. When the material of the micro-perforated plate 1 is the same as that of the box body 2, the service life of the micro-perforated plate 1 can be improved, thereby avoiding the noise reduction effect after long-term use due to the short service life of the micro-perforated plate 1. The perforation rate of the micro-perforated plate 1 is the ratio of the opening 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:

[0099] After initial installation, the micro-perforated plate 1 is parallel to the height direction of the box 2. During the operation of the clothing processing device, the noise collector 4 collects noise signals and sends the collected 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 a frequency band with an amplitude greater than a set amplitude from the spectrum data as a target frequency band.

[0100] If the target frequency band is in the second preset medium and high frequency range, the micro-perforated plate 1 is kept parallel to the height direction of the box 2. If the target frequency band is in the first preset medium and high frequency range, the control module 5 controls the driving mechanism to operate so that the micro-perforated plate 1 rotates in a direction away from 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 close to the muffler cavity 9 and the height direction of the box 2 reaches the maximum angle value.

[0101] If the target frequency band is within the preset low-frequency range, the control module 5 controls the driving mechanism to rotate the micro-perforated plate 1 in the direction away from 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 close to the sound-absorbing cavity 9 and the height direction of the box 2 is the maximum angle value. At the same time, the control module 5 generates an anti-phase noise reduction signal according to 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 according to the anti-phase noise reduction signal.

[0102] In the second aspect, an embodiment of the present invention provides a clothing 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 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 part 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, and 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, and the control module 5 is used to control the driving mechanism according to the noise signal collected by the noise collector 4.

[0103] The clothes processing device includes a clothes processing drum, which is used to place and process clothes, and the clothes processing drum is located in the box 2. The clothes processing device processes clothes including washing and / or drying. The clothes processing device can specifically be a washing machine, a dryer, a washing and drying machine, etc. The washing machine can specifically be a drum washing machine.

[0104] In the embodiment of the present invention, the sound-absorbing cavity 9 defined by the micro-perforated plate 1 and at least part of the inner wall of the micro-perforated plate 1 and the housing 2 can effectively reduce noise, and the frequency range of the sound-absorbing is wide, so that the noise propagating outward can be effectively reduced, the noise reduction effect on the clothing processing equipment is ensured, the sound quality characteristics of the clothing processing equipment are improved, and the user experience is improved. In the embodiment of the present invention, the control module 5 can control the driving mechanism according to the noise signal collected by the noise collector 4, so as to adjust the angle between the surface of the micro-perforated plate 1 close to the sound-absorbing cavity 9 and the height direction of the housing 2 according to different noise conditions, so as to adjust the depth of the sound-absorbing cavity 9 behind most of the micro-perforations 11 in the micro-perforated plate 1, so as to adapt to the complex noise environment, carry out targeted noise reduction, and achieve the best noise reduction effect as much as possible. In addition, the micro-perforated plate 1 is a clean sound-absorbing structure with low sound quality and high sound resistance. Compared with traditional sound-absorbing cotton, it has the characteristics of high temperature resistance, high-speed airflow impact resistance, and environmental protection.

[0105] Optionally, the noise reduction device further comprises a noise absorbing layer, which is located in the silencing cavity 9 and connected to the micro-perforated plate 1 and / or the box 2. The noise absorbing layer may be connected only to the micro-perforated plate 1, or only to the box 2, or may be connected to both the micro-perforated plate 1 and the box 2.

[0106] Optionally, the noise absorbing layer includes a plurality of acoustic black hole structures 6; the plurality of acoustic black hole structures 6 are arranged in a plurality of rows and columns at intervals.

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

[0108] Optionally, the acoustic black hole structure 6 includes a tubular shell 61 and a plurality of circular rings 62 arranged in the tubular shell 61, and the plurality of circular rings 62 are arranged at intervals along the axial direction of the tubular shell 61; the material of the tubular shell 61 is a first rubber, and the material of the circular rings 62 is 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 a frequency band with an amplitude greater than a set amplitude from the spectrum data as a target frequency band; and control the driving mechanism according to the target frequency band.

[0110] Optionally, the noise reduction device also includes a speaker 8 near the connection between the micro-perforated plate 1 and the box 2, the speaker 8 is electrically connected to the control module 5, and the speaker 8 is connected to the micro-perforated plate 1 or the box 2; the control module 5 is used to generate an anti-phase noise reduction signal according to 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 according to the anti-phase noise reduction signal.

[0111] Optionally, the control module 5 is used to control the operation of the driving mechanism when the target frequency band is in a preset low frequency range or a first preset medium and high frequency range, and the angle between the surface of the micro-perforated plate 1 close to the silencer cavity 9 and the height direction of the box 2 is less than the maximum angle value, so that the micro-perforated plate 1 rotates in a direction away from 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 close to the silencer cavity 9 and the height direction of the box 2 reaches the maximum angle value.

[0112] The control module is used to control the operation of the driving mechanism 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 close to the silencer 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 close to the silencer cavity 9 and the height direction of the box 2 is 0°, wherein the lower limit value of the second preset mid-high frequency range is greater than the upper limit value of the first preset mid-high frequency range.

[0113] Optionally, the noise reduction device also includes a first limiting mechanism 7 and a second limiting mechanism, and the first limiting mechanism 7 and the second limiting mechanism are connected to the box body 2; the first limiting mechanism 7 and the second limiting mechanism are respectively located on both sides of the micro-perforated plate 1 along the first direction, and the first direction is perpendicular to the height direction of the box body 2, and the first direction is 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 driving the first telescopic limiting member to be extended or retracted, and the second limiting mechanism includes a second telescopic limiting member and a second driving member driving the second telescopic limiting member to be extended or retracted; the first telescopic limiting member contacts the surface of the micro-perforated plate 1 away from the silencer cavity 9, and the second telescopic limiting member contacts the surface of the micro-perforated plate 1 close to the silencer cavity 9.

[0115] Optionally, a groove 22 is provided on the box 2, and the bottom end of the micro-perforated plate 1 is rotatably connected in the groove 22. The groove 22 is used to define the installation position of the micro-perforated plate 1. When the micro-perforated plate 1 is installed, the micro-perforated plate 1 can be vertically inserted into the groove 22 from top to bottom, and then the micro-perforated plate 1 is rotatably connected to the box 2 through the rotating shaft. The connection between the rotating shaft and the micro-perforated plate 1 and the box 2 can be a detachable connection to facilitate the disassembly and replacement of the micro-perforated plate 1.

[0116] Optionally, the angle between the surface of the micro-perforated plate 1 close to the silencer 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 close to the silencer cavity 9 and the height direction of the box 2 is 0°, along the thickness direction of the micro-perforated plate 1, the distance between the surface of the micro-perforated plate 1 close to the silencer cavity 9 and the inner wall of the box 2 opposite to 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-perforation 11 is circular, and the diameter of the micro-perforation 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 that of the box 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 laundry processing device is parallel to the height direction of the housing 2. The noise reduction process during the operation of the above-mentioned laundry processing device may include:

[0119] The noise collector 4 collects noise signals and sends the collected 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 a frequency band with an amplitude greater than a set amplitude from the spectrum data as a target frequency band.

[0120] If the target frequency band is in the second preset medium and high frequency range, the micro-perforated plate 1 is kept parallel to the height direction of the box 2. If the target frequency band is in the first preset medium and high frequency range, the control module 5 controls the driving mechanism to operate so that the micro-perforated plate 1 rotates in a direction away from 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 close to the muffler cavity 9 and the height direction of the box 2 reaches the maximum angle value.

[0121] If the target frequency band is within the preset low-frequency range, the control module 5 controls the driving mechanism to rotate the micro-perforated plate 1 in the direction away from 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 close to the sound-absorbing cavity 9 and the height direction of the box 2 is the maximum angle value. At the same time, the control module 5 generates an anti-phase noise reduction signal according to 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 according to the anti-phase noise reduction signal.

[0122] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0123] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0124] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0125] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

[0126] The noise reduction device and clothing processing equipment provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the structure of the present invention and its core idea; at the same time, for general technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A noise reduction device, characterized in that: include: Box; A micro-perforated plate having a plurality of micro-perforations, wherein a sound-absorbing cavity is defined between the micro-perforated plate and at least a portion of the inner wall of the box body, and one end of the micro-perforated plate along the height direction of the box body is rotatably connected to the box body; A driving mechanism, connected to the micro-perforated plate and used to drive the micro-perforated plate to rotate; The noise reduction adjustment module includes a noise collector and a control module, wherein the control module is electrically connected to the noise collector and the driving mechanism, and the control module is used to control the driving mechanism according to the noise signal collected by the noise collector.

2. The noise reduction device according to claim 1, characterized in that: The noise reduction device further comprises a noise absorbing layer, wherein the noise absorbing layer is located in the sound-absorbing cavity and is connected to the micro-perforated plate and / or the box body.

3. The noise reduction device according to claim 2, characterized in that: The noise absorbing layer includes a plurality of acoustic black hole structures; The 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 two ends of the acoustic black hole structure along the thickness direction of the micro-perforated plate are respectively connected to the micro-perforated plate and the box body; The material of the acoustic black hole structure is a retractable material.

5. The noise reduction device according to claim 4, characterized in that: The acoustic black hole structure comprises a tubular shell and a plurality of circular rings arranged in the tubular shell, wherein the plurality of circular rings are arranged at intervals along the axial direction of the tubular shell; The material of the tubular housing is a first rubber, and the material of the ring is 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.

6. The noise reduction device according to claim 1, characterized in that: 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 driving mechanism according to the target frequency band.

7. The noise reduction device according to claim 6, characterized in that: The noise reduction device further comprises a speaker near the connection between the micro-perforated plate and the box, the speaker is electrically connected to the control module, and the speaker is connected to the micro-perforated plate or the box; The control module is used to generate an anti-phase noise reduction signal according to 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 according to the anti-phase noise reduction signal.

8. The noise reduction device according to claim 6, characterized in that: The control module is used to control the driving mechanism to operate so that the micro-perforated plate rotates in a direction away from the inner wall of the box body opposite to the micro-perforated plate when the target frequency band is in a preset low frequency range or a first preset medium and high frequency range and the angle between the surface of the micro-perforated plate close to the silencing cavity and the height direction of the box body is less than a maximum angle value, until the angle between the surface of the micro-perforated plate close to the silencing cavity and the height direction of the box body reaches a maximum angle value; The control module is used to control the driving mechanism to operate when the target frequency band is in the second preset medium and high frequency range and the angle between the surface of the micro-perforated plate close to the silencing 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 close to the silencing cavity and the height direction of the box is 0°; Wherein, the lower limit value of the second preset mid-high frequency range is greater than the upper limit value of the first preset mid-high frequency range.

9. The noise reduction device according to claim 1, characterized in that: The noise reduction device further comprises a first limiting mechanism and a second limiting mechanism, wherein the first limiting mechanism and the second limiting mechanism are connected to the box body; The first limiting mechanism and the second limiting mechanism are respectively located on both sides of the micro-perforated plate along a first direction, the first direction is perpendicular to the height direction of the box, and the first direction is 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 driving the first telescopic limiting member to extend and retract, and the second limiting mechanism includes a second telescopic limiting member and a second driving member driving the second telescopic limiting member to extend and retract; The first telescopic limiting member contacts a surface of the micro-perforated plate away from the muffler cavity, and the second telescopic limiting member contacts a surface of the micro-perforated plate close to the muffler cavity.

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

11. The noise reduction device according to claim 1, characterized in that: The angle between the surface of the micro-perforated plate close to the muffler cavity and the height direction of the box body is in the range of 0°-10°; When the angle between the surface of the micro-perforated plate close to the silencer cavity and the height direction of the box is 0°, along the thickness direction of the micro-perforated plate, the distance between the surface of the micro-perforated plate close to the silencer cavity and the inner wall of the box opposite to the micro-perforated plate is 15mm-25mm.

12. 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 shape of the micro-perforation is circular, and the diameter of the micro-perforation 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 that of the box body; And / or, the perforation rate of the micro-perforated plate is 1%-2%.

13. A clothes processing device, characterized in that: The method comprises the noise reduction device according to any one of claims 1 to 12.

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