Ventilation and noise reduction structure and device and electric equipment

Abstract

The invention relates to a ventilation and noise reduction structure and device and electric equipment, the ventilation and noise reduction structure comprises a first shell and a second shell, the first shell is enclosed to form a ventilation channel, the second shell is sleeved outside the first shell, a cavity is formed by the second shell and the first shell, and the ventilation channel is communicated with the second shell. The first shell is provided with at least one through hole which is communicated with the ventilation channel and the cavity, and the through hole is used for reducing noise; therefore, an effective resonance noise reduction structure is formed through the cavity and the through holes, the resonator structure is combined with the ventilation channel, under the condition that ventilation is guaranteed, a sound insulation wide spectrum can be effectively formed, noise in a wide frequency range is blocked, and therefore the wide-spectrum sound insulation effect on sound waves of different frequencies is achieved while the ventilation effect is guaranteed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of noise reduction, and in particular to a ventilation noise reduction structure, device and electrical equipment. Background Art

[0002] With the rapid development of the automobile industry and the improvement of people's living standards, consumers have higher and higher requirements for car riding comfort. The noise generated during the operation of the vehicle, such as engine noise, tire noise, wind noise, etc., will seriously affect the riding experience. Excessive noise levels will not only affect the comfort of passengers, but may also cause damage to their hearing and mental health. Therefore, reducing noise pollution and improving the acoustic environment quality inside the vehicle are important measures to protect passenger health and improve the riding experience.

[0003] In the prior art, ventilation and noise reduction cannot usually be achieved at the same time. In most cases, good ventilation means fewer partitions, so the noise reduction effect is bound to be poor. Therefore, it is particularly important to design a structure that can ensure both ventilation and good noise reduction function. Summary of the invention

[0004] The purpose of the present invention is to provide a ventilation noise reduction structure, device and electrical equipment.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a ventilation and noise reduction structure in a first aspect, comprising a first shell 1 and a second shell 2.

[0006] The first shell 1 encloses a ventilation channel 3, the second shell 2 is sleeved outside the first shell 1 to form a chamber 4 with the first shell 1, and the first shell 1 is provided with at least one through hole 11 connecting the ventilation channel 3 and the chamber 4, and the through hole 11 is used for noise reduction.

[0007] Optionally, the lower limit frequency of the wide spectrum of sound insulation formed by the ventilation and noise reduction structure is adjusted by adjusting the size of the area covered by the through hole.

[0008] Optionally, the size of the covered area of ​​the through hole is negatively correlated with the lower limit frequency of the wide sound insulation spectrum formed by the ventilation and noise reduction structure.

[0009] Optionally, the through hole is provided with a baffle 12 with adjustable opening and closing degree.

[0010] Optionally, the ventilation and noise reduction structure further includes a baffle driving assembly 5 , the baffle 12 is connected to the baffle driving assembly 5 , and the baffle driving assembly 5 can drive the baffle 12 to move to adjust the area covered by the through hole 11 .

[0011] Optionally, the baffle driving assembly 5 includes a motor 51 and a threaded rod 52. A connecting block 54 is provided on the baffle 12. The baffle 12 is connected to the threaded rod 52 through the connecting block 54. One end of the threaded rod 52 is connected to the motor 51, and the other end of the threaded rod 52 is a free end. The motor 51 drives the threaded rod 52 to rotate so that the baffle 12 moves along the threaded rod 52 under the action of the axial force of the thread.

[0012] Optionally, the baffle driving assembly 5 includes a telescopic rod 53 , the baffle 12 is fixed to one end of the telescopic rod 53 , and the baffle 12 moves as the telescopic rod 53 is extended or shortened.

[0013] Optionally, it further comprises a controller 6, wherein the controller 6 is electrically connected to the baffle driving assembly 5;

[0014] The controller 6 is used to send a driving signal to the baffle driving assembly 5 so that the baffle driving assembly 5 drives the baffle 12 to move according to the driving signal to change the area covered by the through hole 11 .

[0015] Optionally, a noise collecting component 7 is further included, and the noise collecting component 7 is electrically connected to the controller 6.

[0016] The noise collection component 7 is used to collect the current noise signal and send the noise signal to the controller 6;

[0017] The controller 6 is used to determine the target moving distance of the baffle 12 according to the noise signal, and generate the driving signal according to the target moving distance.

[0018] Optionally, the controller 6 is used to perform spectrum analysis on the noise signal to obtain a maximum spectrum value in the noise signal, determine a target moving distance of the baffle 12 according to the maximum spectrum value, and generate the driving signal according to the target moving distance.

[0019] Optionally, the controller 6 is used to input the maximum spectrum value as a variable value of the sound insulation peak frequency into a preset function to obtain the target moving distance output by the preset function, wherein the preset function is used to characterize the corresponding relationship between the moving distance of the baffle 12 and the sound insulation peak frequency.

[0020] Optionally, the first shell 1 encloses a tubular ventilation channel 3, and the second shell 2 includes a top cover 21, a bottom cover 22 and a side wall 23; the side wall and the top cover and the bottom cover form an outer cavity wall of the chamber, the tubular ventilation channel 3 formed by the second shell passes through the top cover 21 and the bottom cover 22 of the second shell 2, and the second shell 2 and the outer cavity wall form the chamber 4.

[0021] Optionally, the first shell 1 includes a first ventilation tube body 13 and a second ventilation tube body 14, the top cover 21 is provided with a first notch having the same shape and size as the cross-section of the first ventilation tube body 13, the bottom cover 22 is provided with a second notch having the same shape and size as the cross-section of the second ventilation tube body 14, the first end of the first ventilation tube body 13 is fixed at the first notch of the top cover 21, the second end of the first ventilation tube body 13 is plugged into the first end of the second ventilation tube body 14 to form the tubular ventilation channel 3, and the second end of the second ventilation tube body 14 is fixed at the second notch of the bottom cover 22.

[0022] Optionally, the side wall 23 includes a top side wall 231 and a bottom side wall 232 , the top side wall 231 is integrally formed with the top cover 21 and the first ventilation pipe body 13 , and the bottom side wall 232 is integrally formed with the bottom cover 22 and the second ventilation pipe body 14 .

[0023] Optionally, the top side wall 231 is connected to the bottom side wall 232 by a target connection method, and the target connection method may be one of plug-in connection, threaded connection, hinged connection and snap-on connection.

[0024] Optionally, the length of the first ventilation tube body 13 is greater than or equal to the length of the second ventilation tube body 14 , and the length of the first ventilation tube body 13 is less than the length of the ventilation channel 3 .

[0025] Optionally, the length of the first ventilation tube body 13 and the length of the second ventilation tube body 14 are both equal to the length of the ventilation channel 3 .

[0026] Optionally, the through hole 11 is provided on the first ventilation tube body 13 and / or the second ventilation tube body 14 .

[0027] Optionally, the cross-sections of the ventilation passage 3 and the second shell 2 may be circular, square, rectangular, hexagonal, triangular, trapezoidal or irregular closed shapes.

[0028] A second aspect of the present disclosure provides a ventilation and noise reduction device, comprising one or more ventilation and noise reduction structures described in the first aspect.

[0029] A third aspect of the present disclosure provides an electrical device, comprising the ventilation and noise reduction device described in the second aspect above.

[0030] Through the above technical scheme, a ventilation and noise reduction structure is provided, including a first shell 1 and a second shell 2, wherein the first shell 1 encloses a ventilation channel 3, the second shell 2 is sleeved outside the first shell 1, and forms a chamber 4 with the first shell 1, and the first shell 1 is provided with at least one through hole 11 connecting the ventilation channel 3 and the chamber 4, and the through hole 11 is used for noise reduction; in this way, an effective resonance silencing structure is formed by the chamber 4 and the through hole 11, and the resonator structure is combined with the ventilation channel to effectively form a wide spectrum of sound insulation while ensuring ventilation, and block noise in a wider frequency range, thereby achieving a wide spectrum of sound insulation for sound waves of different frequencies while ensuring ventilation effect.

[0031] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0033] Figure 1 is a structural schematic diagram of a ventilation and noise reduction structure shown in an exemplary embodiment of the present disclosure;

[0034] Figure 2 This disclosure Figure 1 Schematic diagram of transfer curve of ventilation noise reduction structure shown in;

[0035] Figure 3 This disclosure Figure 1 A top view of the ventilation and noise reduction structure shown;

[0036] Figure 4 yes Figure 3 Cross-section view in the AA direction;

[0037] Figure 5 is a block diagram of a control system of a ventilation and noise reduction structure shown in an exemplary embodiment of the present disclosure;

[0038] Figure 6 is a schematic diagram of simulation results of a ventilation and noise reduction structure shown in an exemplary embodiment of the present disclosure;

[0039] Figure 7 is a schematic diagram showing a function obtained by fitting simulation data according to an exemplary embodiment of the present disclosure;

[0040] Figure 8a is a structural schematic diagram of another ventilation and noise reduction structure shown in an exemplary embodiment of the present disclosure;

[0041] Figure 8bis a structural schematic diagram of another ventilation and noise reduction structure shown in an exemplary embodiment of the present disclosure;

[0042] Fig. 9 It is a structural schematic diagram of a ventilation and noise reduction device shown in an exemplary embodiment of the present disclosure.

[0043] Description of Reference Numerals

[0044] 1 is the first shell, 11 is the through hole, 12 is the baffle, 13 is the first ventilation pipe body, 14 is the second ventilation pipe body, 2 is the second shell, 21 is the top cover, 22 is the bottom cover, 23 is the side wall, 231 is the top side wall, 232 is the bottom side wall, 3 is the ventilation channel, 4 is the chamber, 5 is the baffle drive assembly, 51 is the motor, 52 is the threaded rod, 53 is the telescopic rod, 54 is the connecting block, 6 is the controller, and 7 is the noise collection assembly. DETAILED DESCRIPTION

[0045] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0046] Before introducing the specific embodiments of the present disclosure in detail, first of all, the application scenarios of the present disclosure are described as follows. The ventilation and noise reduction structure in the present disclosure can be used in various scenarios that require both ventilation and noise reduction, such as transportation (such as roads, airports, vehicles, etc.), industry (such as factory workshops), construction (metal roofs, steel structure buildings, etc.), public places (such as multi-functional venues, such as schools, hospitals, concert halls, theaters, cinemas, etc.), electrical equipment (such as air conditioners, refrigerators, treadmills, etc.) and other fields. These scenarios usually require that while ensuring air circulation, noise interference is effectively reduced to create a comfortable, healthy and efficient environment. Here, a vehicle is used as an example to illustrate that the ventilation and noise reduction structure is installed on the part of the vehicle that needs sound insulation. For example, it can be installed in the engine compartment of the vehicle to reduce the large amount of noise generated by the engine, exhaust system and other components in the engine compartment. It can also be installed on the ceiling and floor of the vehicle to effectively isolate various noises inside the vehicle and improve the comfort of passengers in the vehicle. It can also be installed in the air conditioning system to reduce the noise from compressors, fans and other equipment.

[0047] In the related art, ventilation and noise reduction cannot usually be achieved at the same time. In most cases, good ventilation means fewer partitions, so the noise reduction effect is bound to be poor. Therefore, it is particularly important to design a structure that can ensure both ventilation and good noise reduction function.

[0048] In addition, the inventors have also found that when using the resonance principle for sound insulation, there is often a high degree of frequency dependence, that is, only single-frequency or short-frequency noise can be controlled, and a wide-spectrum sound insulation effect cannot be achieved. In addition, the structural units of general acoustic metamaterials are mostly passive, that is, once processed and formed, their material properties are fixed. For example, the frequency band of noise that is effective cannot be changed. This defect greatly limits the development of acoustic metamaterials. Therefore, there is an urgent need for acoustic metamaterials with flexibly adjustable material properties and working frequency bands.

[0049] In order to solve the above technical problems, the present disclosure provides a ventilation and noise reduction structure, including a first shell 1 and a second shell 2, wherein the first shell 1 encloses a ventilation channel 3, the second shell 2 is sleeved outside the first shell 1, and forms a chamber 4 with the first shell 1, and the first shell 1 is provided with at least one through hole 11 connecting the ventilation channel 3 and the chamber 4, and the through hole 11 is provided with a baffle 12 with an adjustable opening degree, so that an effective resonance silencing structure is formed by the chamber 4 and the through hole 11, and the resonator structure is combined with the ventilation channel to effectively form a wide spectrum of sound insulation while ensuring ventilation, and block noise in a wider frequency range, thereby achieving a wide spectrum of sound insulation for sound waves of different frequencies while ensuring the ventilation effect; further, by arranging a baffle with an adjustable opening degree for the through hole, the opening degree of the through hole is adjusted by the baffle, and different degrees of closure can block noise in different frequency ranges, thereby effectively realizing flexible adjustment of the working frequency band.

[0050] Figure 1 is a structural schematic diagram of a ventilation and noise reduction structure shown in an exemplary embodiment of the present disclosure; Figure 1 As shown, the ventilation and noise reduction structure includes a first shell 1 and a second shell 2.

[0051] The first shell 1 encloses a ventilation channel 3, the second shell 2 is sleeved outside the first shell 1 to form a chamber 4 with the first shell 1, and the first shell 1 is provided with at least one through hole 11 connecting the ventilation channel 3 and the chamber 4, and the through hole 11 is used for noise reduction.

[0052] In some embodiments, the lower limit frequency of the wide spectrum of sound insulation formed by the ventilation and noise reduction structure can be adjusted by adjusting the size of the area covered by the through hole.

[0053] The lower limit frequency of the wide spectrum of sound insulation can be understood as the lower limit value of the sound insulation peak frequency of the ventilation noise reduction structure. Figure 2) generally include two sound insulation peak frequencies, and experimental data show that the larger the exposed area of ​​the through hole (i.e., the smaller the covered area), the larger the first sound insulation peak frequency (i.e., the lower limit frequency of the wide sound insulation spectrum). That is, when the through hole is not covered, the exposed area of ​​the through hole is positively correlated with the lower limit frequency of the wide sound insulation spectrum formed by the ventilation and noise reduction structure, and the size of the covered area of ​​the through hole is negatively correlated with the lower limit frequency of the wide sound insulation spectrum formed by the ventilation and noise reduction structure. Optionally, the shape of the through hole 11 can be circular, elliptical, square, star, triangle or trapezoid, etc., or other irregular closed figures.

[0054] It should be noted that the lower limit frequency of the wide spectrum of sound insulation formed by the ventilation and noise reduction structure can be calculated by the following formula:

[0055]

[0056] In the above formula, f 0 is the resonant sound absorption frequency of the ventilation and noise reduction structure, which can also be understood as the lower limit frequency of the wide sound insulation spectrum formed by the ventilation and noise reduction structure, c is the speed of sound, S is the cross-sectional area of ​​the through hole, l is the depth of the through hole, d is the radius of the through hole, and v is the volume of the cavity. Therefore, by adjusting the depth, radius (shape and size) or area of ​​the through hole 11, the resonant sound absorption frequency f of the structure can be adjusted. 0 In the present disclosure, after the ventilation and noise reduction structure is generated, the depth and radius (shape and size) of the through hole 11 will be fixed values. The present disclosure adjusts the resonant sound absorption frequency (i.e., the lower limit frequency of the wide sound insulation spectrum formed by the ventilation and noise reduction structure) by adjusting the area of ​​the region covered by the through hole or the number of through holes. The upper limit frequency of the wide sound insulation spectrum formed by the ventilation and noise reduction structure is greater than the lower limit frequency, and the upper limit frequency of the wide sound insulation spectrum can be obtained through simulation experiments.

[0057] In addition, it should be pointed out that the ventilation and noise reduction structure in the present invention can achieve the sound-absorbing effect, mainly because the chamber 4 and the through hole 11 can form a Helmholtz resonator, and the contrast between the transmission of sound waves between the ventilation channel and the Helmholtz resonator is relatively large. Therefore, it is easier to produce Fano-like interference phenomenon, so it can effectively form a wide spectrum of sound insulation, block noise in a wider frequency range, and thus achieve a wide spectrum of sound insulation for sound waves of different frequencies.

[0058] Optionally, the through hole 11 is provided with a baffle 12 with adjustable opening and closing degree.

[0059] The baffle may be in a regular shape such as a rectangle or a square, or in an irregular shape. The baffle may cover the entire through hole or part of the through hole.

[0060] Optionally, in a possible implementation manner, the through hole 11 is provided with a baffle 12 with an adjustable opening degree. The baffle 12 can be fixed to the edge of the through hole 11 by a hinge, and the opening degree of the baffle 12 to the through hole is changed by adjusting the rotation angle of the hinge. The larger the opening degree, the smaller the air intake of the through hole, and the corresponding resonant sound absorption frequency f 0 The smaller.

[0061] In another possible implementation, the baffle 12 can slide via a slide rail to adjust the opening and closing degree of the through hole 11, wherein the larger the area of ​​the through hole covered by the baffle is, the higher the resonant sound absorption frequency f 0 The smaller.

[0062] For example, Figure 2 This disclosure Figure 1 The schematic diagram of the transfer curve of the ventilation noise reduction structure shown in Figure 1 The length of the through hole is 10mm. When the length of the through hole is covered by the cover plate for 9.5mm, the remaining gap length of the through hole is 0.5mm. When the length of the through hole is covered by the cover plate for 9mm, the remaining gap length of the through hole is 1.0mm. When the length of the through hole is covered by the cover plate for 6.5mm, the remaining gap length of the through hole is 3.5mm. When the length of the through hole is covered by the cover plate for 2.5mm, the remaining gap length of the through hole is 7.5mm. Figure 2 The figure includes the transmission loss curve of the sound wave when the through hole is completely closed, and the transmission curve when the remaining gap length of the through hole is 0.5mm, 1.0mm, 3.5mm, and 7.5mm. Figure 2 It can be clearly seen from the multiple transmission loss curves in Figure 1 that as the remaining gap of the through hole becomes smaller, that is, the covered area becomes larger, the resonant sound absorption frequency becomes smaller. It should be noted that the ventilation noise reduction structure is targeted at frequencies above Figure 2 The sound waves between the two frequency peaks in have a blocking effect, for example, Figure 2 In the figure, when the remaining gap length of the through hole is 3.5mm, the first frequency peak value corresponding to the ventilation and noise reduction structure is 500HZ, and the second frequency peak value is approximately 2100HZ. At this time, the ventilation and noise reduction structure has a blocking effect on noises with frequencies between 500HZ and 2100HZ. For another example, when the remaining gap length is 7.5mm, the first frequency peak value corresponding to the ventilation and noise reduction structure is approximately 700HZ, and the second frequency peak value is approximately 2200HZ. At this time, the ventilation and noise reduction structure has a blocking effect on noises with frequencies between 700HZ and 2200HZ. It can be clearly proved here that the through hole will correspond to different frequency ranges under different remaining gaps, and as the remaining gap decreases, the first frequency peak value becomes smaller.

[0063] The above technical scheme can form an effective resonant silencer structure through the chamber 4 and the through hole 11. The resonator structure combined with the ventilation channel can effectively form a wide spectrum of sound insulation and block noise in a wider frequency range, thereby achieving a wide spectrum sound insulation effect for sound waves of different frequencies; and because the opening and closing degree of the through hole can be adjusted, different degrees of closing can block noise in different frequency ranges, and can effectively realize flexible adjustment of the working frequency band.

[0064] Optionally, the ventilation and noise reduction structure further includes a baffle driving assembly 5 , the baffle 12 is connected to the baffle driving assembly 5 , and the baffle driving assembly 5 can drive the baffle 12 to move to adjust the area covered by the through hole 11 .

[0065] In one possible implementation, Figure 3 As shown, Figure 3 This disclosure Figure 1 The top view of the ventilation and noise reduction structure is shown. Figure 4 yes Figure 3 The cross-section view in the AA direction is as follows: Figure 3 and Figure 4 As shown, the baffle driving assembly 5 includes a motor 51 and a threaded rod 52. A connecting block 54 is provided on the baffle 12. The baffle 12 is connected to the threaded rod 52 through the connecting block 54. One end of the threaded rod 52 is connected to the motor 51, and the other end of the threaded rod 52 is a free end. The motor 51 drives the threaded rod 52 to rotate, so that the baffle 12 moves along the threaded rod 52 under the action of the axial force of the thread.

[0066] The connection block 54 may be provided with a screw hole through which the threaded rod passes.

[0067] In another embodiment, the baffle driving assembly 5 includes a telescopic rod 53 , the baffle 12 is fixed to one end of the telescopic rod 53 , and the baffle 12 moves as the telescopic rod 53 is extended or shortened.

[0068] The telescopic rod may be a hydraulic telescopic rod or a non-hydraulic telescopic rod, and the power device of the telescopic rod may also be a motor.

[0069] In another embodiment, the baffle driving assembly 5 includes a motor and a slide rail, and the baffle is connected to the slide rail via a pulley. The pulley can drive the baffle to move in the slide rail to adjust the position of the baffle, thereby achieving the effect of adjusting the opening and closing degree of the baffle and the through hole.

[0070] The above technical solution, through the setting of the baffle driving assembly 5, can automatically adjust the coverage area of ​​the through hole, so as to facilitate the convenient and quick adjustment of the working frequency band of the ventilation and noise reduction structure.

[0071] Figure 5 is a block diagram of a control system of a ventilation and noise reduction structure shown in an exemplary embodiment of the present disclosure, the control system of the ventilation and noise reduction structure may include a controller 6, the controller 6 is electrically connected to the baffle driving assembly 5;

[0072] The controller 6 is used to send a driving signal to the baffle driving assembly 5 so that the baffle driving assembly 5 drives the baffle 12 to move according to the driving signal to change the area covered by the through hole 11 .

[0073] The driving signal may be a level signal, a PWM signal, or a switch signal.

[0074] Optionally, a noise collecting component 7 is further included, and the noise collecting component 7 is electrically connected to the controller 6.

[0075] The noise collection component 7 is used to collect the current noise signal and send the noise signal to the controller 6;

[0076] The controller 6 is used to determine the target moving distance of the baffle 12 according to the noise signal, and generate the driving signal according to the target moving distance.

[0077] The noise collecting component 7 may be a microphone, a noise collecting sensor, or other devices capable of collecting noise signals. The controller 6 may determine the target moving distance of the baffle 12 according to the noise signal in the following manner:

[0078] The noise signal is subjected to spectrum analysis to obtain a maximum spectrum value in the noise signal, a target moving distance of the baffle 12 is determined according to the maximum spectrum value, and the driving signal is generated according to the target moving distance.

[0079] Among them, when the spectrum analysis of the noise signal is performed, Fourier transform can be used. It should be pointed out that the specific implementation details of the spectrum analysis using Fourier transform can refer to the prior art, and the present disclosure does not limit this. In addition, the implementation method of generating the drive signal according to the target moving distance can be to preset and store target relationship data between the moving distance and the drive signal. The target relationship data can include the corresponding relationship between different moving distances and different drive signals. The drive signal corresponding to the target moving distance can be found from the target relationship data. For example, when the drive signal is a PWM signal, different target moving distances can correspond to different PWM signals.

[0080] In one embodiment, the controller 6 can input the maximum spectrum value as a variable value of the sound insulation peak frequency into a preset function to obtain the target moving distance output by the preset function, wherein the preset function is used to characterize the corresponding relationship between the moving distance of the baffle 12 and the sound insulation peak frequency.

[0081] It should be noted that the process of obtaining the preset function may include: simulating the sound insulation conditions of the baffle at different positions in the simulation software, and obtaining the transfer curves of the baffle at different positions using the simulation software, such as Figure 6 As shown, Figure 6 1 is a schematic diagram of simulation results of a ventilation noise reduction structure shown in an exemplary embodiment of the present disclosure. According to the transfer curves of the baffle at different positions in the simulation result schematic diagram, the sound insulation peak frequencies at different positions are determined to obtain multiple discrete points. The abscissa of the point can be the sound insulation peak value, and the ordinate of the point can be the moving distance of the baffle 12. The moving distance is positively correlated with the length of the through hole covered by the baffle, that is, the longer the moving distance, the longer the length of the through hole covered by the baffle, the smaller the remaining gap length of the through hole, and the larger the area covered by the through hole. Figure 7 As shown, Figure 7 It is a schematic diagram showing an exemplary embodiment of the present disclosure of fitting a function based on simulation data, where the plurality of discrete points are fitted to obtain the preset function.

[0082] In another embodiment, the controller 6 may pre-store preset corresponding relationship data, and the preset corresponding relationship data may include the corresponding relationship between different maximum spectrum values ​​and different moving distances. The preset corresponding relationship may be in the form of a table, a curve, or a document. The document may include a plurality of discrete points, and the abscissa of the point may be the sound insulation peak value, and the ordinate of the point may be the moving distance of the baffle 12, that is, the length of the baffle covering the through hole, such as Figure 7 Discrete points before function fitting.

[0083] Figure 8a is a structural schematic diagram of another ventilation and noise reduction structure shown in an exemplary embodiment of the present disclosure; Figure 8a As shown, the first shell 1 encloses a tubular ventilation channel 3, and the second shell 2 includes a top cover 21, a bottom cover 22 and a side wall 23; the side wall and the top cover and the bottom cover form an outer cavity wall of the chamber, and the tubular ventilation channel 3 formed by the second shell passes through the top cover 21 and the bottom cover 22 of the second shell 2, and the second shell 2 and the outer cavity wall form the chamber 4.

[0084] Among them, the first shell 1 includes a first ventilation tube body 13 and a second ventilation tube body 14, the top cover 21 is provided with a first notch with the same shape and size as the cross-section of the first ventilation tube body 13, and the bottom cover 22 is provided with a second notch with the same shape and size as the cross-section of the second ventilation tube body 14, the first end of the first ventilation tube body 13 is fixed at the first notch of the top cover 21, the second end of the first ventilation tube body 13 is plugged into the first end of the second ventilation tube body 14 to form the tubular ventilation channel 3, and the second end of the second ventilation tube body 14 is fixed at the second notch of the bottom cover 22.

[0085] Among them, the top cover 21 is provided with a first notch which is the same shape and size as the cross-section of the first ventilation tube body 13, and the bottom cover 22 is provided with a second notch which is the same shape and size as the cross-section of the second ventilation tube body 14. It can be understood that the first notch is consistent with the port of the first ventilation tube body 13, and the second notch is consistent with the port of the second ventilation tube body 14. There is no gap between the first notch and the first ventilation tube body after being spliced, and there is no gap between the second notch and the second ventilation tube body after being spliced.

[0086] In some embodiments, the side wall 23 may include a top side wall 231 and a bottom side wall 232 , wherein the top side wall 231 is integrally formed with the top cover 21 and the first ventilation tube body 13 , and the bottom side wall 232 is integrally formed with the bottom cover 22 and the second ventilation tube body 14 .

[0087] Optionally, the top side wall 231 is connected to the bottom side wall 232 by a target connection method, and the target connection method may be one of plug-in connection, threaded connection, hinged connection and snap-on connection.

[0088] Optionally, the length of the first ventilation tube body 13 is greater than or equal to the length of the second ventilation tube body 14 , and the length of the first ventilation tube body 13 is less than the length of the ventilation channel 3 .

[0089] Optionally, Figure 8b is a structural schematic diagram of another ventilation and noise reduction structure shown in an exemplary embodiment of the present disclosure; Figure 8b As shown, the length of the first ventilation tube body 13 and the length of the second ventilation tube body 14 are both equal to the length of the ventilation channel 3 .

[0090] Optionally, the through hole 11 is provided on the first ventilation tube body 13 and / or the second ventilation tube body 14 .

[0091] In other embodiments, the side wall 23 may be Figure 4As shown, the side wall 23 is integrally formed with the top cover 21 , and the first shell is integrally formed with the bottom cover 22 ; or, the side wall 23 is integrally formed with the bottom cover 22 , and the first shell is integrally formed with the top cover 21 .

[0092] Optionally, the cross-sections of the ventilation passage 3 and the second shell 2 may be circular, square, rectangular, hexagonal, triangular, trapezoidal or irregular closed shapes.

[0093] The above technical scheme can form an effective resonant silencer structure through the chamber 4 and the through hole 11. The resonator structure combined with the ventilation channel can effectively form a wide spectrum of sound insulation and block noise in a wider frequency range, thereby achieving a wide spectrum sound insulation effect for sound waves of different frequencies; and because the opening and closing degree of the through hole can be adjusted, different degrees of closing can block noise in different frequency ranges, and can effectively realize flexible adjustment of the working frequency band.

[0094] Fig. 9 is a structural schematic diagram of a ventilation and noise reduction device shown in an exemplary embodiment of the present disclosure; Fig. 9 As shown, the ventilation and noise reduction device can be a ventilation and noise reduction wall, and the ventilation and noise reduction wall can be composed of multiple Figure 1 The ventilation and noise reduction structure 900 shown is formed. It should be noted that the controller of the ventilation and noise reduction structure in the ventilation and noise reduction wall can be shared, and the controller controls the movement of each baffle in the ventilation and noise reduction wall.

[0095] Another exemplary embodiment of the present disclosure provides an electric device, which may include the above Fig. 9 The ventilation and noise reduction device, for example, can be provided with the ventilation and noise reduction wall on the roof and chassis to enhance the noise reduction effect inside the vehicle and improve the riding experience of the vehicle users.

[0096] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0097] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0098] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A ventilation and noise reduction structure, characterized in that: comprising a first shell and a second shell, The first shell forms a ventilation channel, the second shell is sleeved outside the first shell to form a chamber with the first shell, and the first shell is provided with at least one through hole connecting the ventilation channel and the chamber, and the through hole is used for noise reduction.

2. The ventilation and noise reduction structure according to claim 1, characterized in that: The lower limit frequency of the wide spectrum of sound insulation formed by the ventilation and noise reduction structure is adjusted by adjusting the size of the area covered by the through hole.

3. The ventilation and noise reduction structure according to claim 1, characterized in that: The size of the area covered by the through hole is negatively correlated with the lower limit frequency of the wide sound insulation spectrum formed by the ventilation and noise reduction structure.

4. The ventilation and noise reduction structure according to claim 1, characterized in that: The through hole is provided with a baffle with adjustable opening and closing degree.

5. The ventilation and noise reduction structure according to claim 4, characterized in that: The ventilation and noise reduction structure further includes a baffle driving assembly, the baffle is connected to the baffle driving assembly, and the baffle driving assembly can drive the baffle to move to adjust the area covered by the through hole.

6. The ventilation and noise reduction structure according to claim 5, characterized in that: The baffle driving assembly includes a motor and a threaded rod. A connecting block is provided on the baffle. The baffle is connected to the threaded rod through the connecting block. One end of the threaded rod is connected to the motor, and the other end of the threaded rod is a free end. The motor drives the threaded rod to rotate so that the baffle moves along the threaded rod under the action of the axial force of the thread.

7. The ventilation and noise reduction structure according to claim 5, characterized in that: The baffle driving assembly comprises a telescopic rod, the baffle is fixed at one end of the telescopic rod, and the baffle moves as the telescopic rod is extended or shortened.

8. The ventilation and noise reduction structure according to claim 5, characterized in that: Also included is a controller, the controller being electrically connected to the baffle drive assembly; The controller is used to send a driving signal to the baffle driving assembly, so that the baffle driving assembly drives the baffle to move according to the driving signal to change the area covered by the through hole.

9. The ventilation and noise reduction structure according to claim 8, characterized in that: It also includes a noise collection component, which is electrically connected to the controller. The noise collection component is used to collect the current noise signal and send the noise signal to the controller; The controller is used to determine a target moving distance of the baffle according to the noise signal, and generate the driving signal according to the target moving distance.

10. The ventilation and noise reduction structure according to claim 9, characterized in that: The controller is used to perform spectrum analysis on the noise signal to obtain a maximum spectrum value in the noise signal, determine a target moving distance of the baffle according to the maximum spectrum value, and generate the driving signal according to the target moving distance.

11. The ventilation and noise reduction structure according to claim 10, characterized in that: The controller is used to input the maximum spectrum value as the variable value of the sound insulation peak frequency into a preset function to obtain the target moving distance output by the preset function, wherein the preset function is used to characterize the corresponding relationship between the moving distance of the baffle and the sound insulation peak frequency.

12. The ventilation and noise reduction structure according to any one of claims 1 to 11, characterized in that: The first shell forms a tubular ventilation passage, and the second shell includes a top cover, a bottom cover and a side wall; the side wall and the top cover and the bottom cover form an outer cavity wall of the chamber, the tubular ventilation passage formed by the second shell runs through the top cover and the bottom cover of the second shell, and the second shell and the outer cavity wall form the chamber.

13. The ventilation and noise reduction structure according to claim 12, characterized in that: The first shell includes a first ventilation tube body and a second ventilation tube body, the top cover is provided with a first notch having the same shape and size as the cross-section of the first ventilation tube body, the bottom cover is provided with a second notch having the same shape and size as the cross-section of the second ventilation tube body, the first end of the first ventilation tube body is fixed at the first notch of the top cover, the second end of the first ventilation tube body is plugged into the first end of the second ventilation tube body to form the tubular ventilation channel, and the second end of the second ventilation tube body is fixed at the second notch of the bottom cover.

14. The ventilation and noise reduction structure according to claim 13, characterized in that: The side wall includes a top side wall and a bottom side wall. The top side wall is formed integrally with the top cover and the first ventilation pipe body, and the bottom side wall is formed integrally with the bottom cover and the second ventilation pipe body.

15. The ventilation and noise reduction structure according to claim 14, characterized in that: The top side wall is connected to the bottom side wall by a target connection mode, and the target connection mode can be one of a plug-in connection, a threaded connection, a hinged connection and a snap-on connection.

16. The ventilation and noise reduction structure according to claim 13, characterized in that: The length of the first ventilation tube body is greater than or equal to the length of the second ventilation tube body, and the length of the first ventilation tube body is less than the length of the ventilation channel.

17. The ventilation and noise reduction structure according to claim 13, characterized in that: The length of the first ventilation tube body and the length of the second ventilation tube body are both equal to the length of the ventilation channel.

18. The ventilation and noise reduction structure according to claim 13, characterized in that: The through hole is arranged on the first ventilation tube body and / or the second ventilation tube body.

19. The ventilation and noise reduction structure according to claim 1, characterized in that: The cross-sections of the ventilation passage and the second shell can be circular, square, rectangular, hexagonal, triangular, trapezoidal or irregular closed shapes.

20. A ventilation and noise reduction device, characterized in that: The invention comprises one or more ventilation and noise reduction structures according to any one of claims 1 to 19.

21. An electrical equipment, characterized in that: It comprises the ventilation and noise reduction device as described in claim 20 above.

Images