Refrigerator, acoustic metamaterial noise reduction device and design method of acoustic metamaterial structure

Abstract

The invention relates to the technical field of acoustic metamaterials, in particular to a refrigerator, an acoustic metamaterial noise reduction device and a design method of an acoustic metamaterial structure. The design method comprises the steps of obtaining a noise spectrum of operation noise of target equipment; obtaining the equivalent lengths of the plurality of quarter-wavelength tubes at least according to the noise spectrum; and obtaining the design lengths of the plurality of silencing cavities according to the equivalent lengths and the apertures of the airflow channels. By the adoption of the method, the design model of the acoustic metamaterial structure can be rapidly designed, the noise reduction effect of the acoustic metamaterial noise reduction device can be improved, and noise reduction and heat dissipation can be balanced. In addition, the design method has the advantages of being scientific, reasonable, simple and easy to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic metamaterials, and in particular to a refrigerator, an acoustic metamaterial noise reduction device and a design method for an acoustic metamaterial structure. Background Art

[0002] At present, in order to solve the heat dissipation and noise reduction problems of refrigerators, we have proposed to set a heat dissipation window on the compressor compartment of the refrigerator, and set an acoustic metamaterial noise reduction device on the heat dissipation window to promote the heat dissipation airflow to flow through the heat dissipation channel of the acoustic metamaterial noise reduction device. At the same time, the sound-absorbing cavity formed on the channel wall of the heat dissipation channel resonates and reduces the noise mixed in the heat dissipation airflow, so as to solve the heat dissipation and noise reduction problems of the refrigerator at the same time.

[0003] However, existing acoustic metamaterial noise reduction devices do not have corresponding design standards, which results in a long design cycle and poor noise reduction effect, which in turn leads to a degradation of user experience. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide an acoustic metamaterial noise reduction device and a design method of an acoustic metamaterial structure that overcome the above problems or at least partially solve the above problems, which can solve the problem of poor noise reduction effect of the acoustic metamaterial noise reduction device and achieve the purpose of improving user experience.

[0005] In one aspect, the present invention provides a design method for an acoustic metamaterial structure, wherein the design model of the acoustic metamaterial structure comprises an airflow channel and a plurality of muffler cavities, wherein the inlet of the muffler cavity is located on the channel wall of the airflow channel;

[0006] The design method comprises:

[0007] Obtain the noise spectrum of the target device's operating noise;

[0008] Obtaining equivalent lengths of a plurality of quarter-wavelength tubes at least according to the noise spectrum;

[0009] The design lengths of the multiple muffler cavities are obtained according to the equivalent length and the aperture of the air flow channel.

[0010] Optionally, the design length of each of the muffler cavities satisfies the following formula:

[0011]

[0012] Among them, H n is the equivalent length of the nth quarter-wavelength tube;

[0013] H is the design length of the nth anechoic cavity;

[0014] D is the aperture of the air flow channel.

[0015] Optionally, the step of obtaining the equivalent lengths of a plurality of quarter-wavelength tubes at least according to the noise spectrum comprises:

[0016] Extracting a target frequency value from the noise spectrum;

[0017] Obtain target transmission losses for multiple quarter-wavelength tubes;

[0018] Based on the target frequency value and the target transmission losses of the quarter-wavelength tubes, the equivalent lengths of the quarter-wavelength tubes are obtained.

[0019] Optionally, the equivalent length of each quarter-wavelength tube satisfies the following formula:

[0020]

[0021] Among them, TL n is the target transmission loss of the nth quarter-wavelength tube;

[0022] a is the ratio of the cross-sectional area of ​​the nth quarter-wavelength tube to the cross-sectional area of ​​the air flow channel;

[0023] k is the wave number corresponding to the target frequency value;

[0024] H n is the equivalent length of the nth quarter-wavelength tube.

[0025] Optionally, the design method further comprises: obtaining a total target transmission loss of the acoustic metamaterial structure;

[0026] In the step of obtaining target transmission losses of a plurality of quarter-wavelength tubes, the target transmission losses of the plurality of quarter-wavelength tubes satisfy the following conditions:

[0027]

[0028] Among them, TL n is the target transmission loss of the nth quarter-wavelength tube;

[0029] TL is the total target transmission loss of the acoustic metamaterial structure.

[0030] Optionally, the step of extracting the target frequency value in the noise spectrum includes:

[0031] extracting a plurality of target noise frequency bands in the noise spectrum;

[0032] Using the noise frequency value corresponding to the maximum noise peak value in each of the target noise frequency bands as the target frequency value of each of the target noise frequency bands; or

[0033] taking an average value of noise frequency values ​​corresponding to a plurality of noise peaks in each of the target noise frequency bands as the target frequency value of each of the target noise frequency bands; or

[0034] The middle noise frequency value in each of the target noise frequency bands is used as the target frequency value of each of the target noise frequency bands.

[0035] Optionally, the design method further includes:

[0036] Obtaining the available spatial volume of the acoustic metamaterial structure;

[0037] Based on the available space volume and heat dissipation efficiency of the acoustic metamaterial structure, obtaining the cross-sectional area of ​​the airflow channel and the cross-sectional area of ​​the quarter-wavelength tube;

[0038] The shape and distribution of the anechoic cavity are obtained based on the available spatial volume of the acoustic metamaterial structure, the designed length of the anechoic cavity, the cross-sectional area of ​​the airflow channel and the cross-sectional area of ​​the quarter-wavelength tube.

[0039] Optionally, the design method further includes:

[0040] According to a plurality of target noise frequency bands, obtaining the number of the anechoic chambers;

[0041] At least one target noise frequency band has an overlapping noise frequency band with another target noise frequency band.

[0042] On the other hand, the present invention also provides an acoustic metamaterial noise reduction device, comprising:

[0043] Acoustic metamaterial structure, the design model used to manufacture the acoustic metamaterial structure is obtained by at least any one of the design methods described above.

[0044] In another aspect, the present invention further provides a refrigerator, comprising:

[0045] A box body is provided with a compressor compartment, and the box body is also provided with the above-mentioned acoustic metamaterial noise reduction device, and the air flow channel of the acoustic metamaterial noise reduction device is connected to the inner side of the compressor compartment.

[0046] The design method of the acoustic metamaterial structure of the present invention obtains the equivalent lengths of multiple quarter-wavelength tubes based on at least the noise spectrum of the target device operation noise, and then obtains the design lengths of multiple anechoic cavities according to the equivalent lengths of the multiple quarter-wavelength tubes and the aperture of the airflow channel. The above method can be used to quickly design a design model of the acoustic metamaterial structure.

[0047] Furthermore, the design model includes multiple anechoic chambers, each of which can reduce noise in a noise frequency band. In other words, each anechoic chamber can achieve broadband noise reduction, so that multiple anechoic chambers can reduce noise in all frequency bands of the noise spectrum, thereby improving the noise reduction effect of the acoustic metamaterial noise reduction device and achieving the purpose of improving user experience.

[0048] Furthermore, the aperture size of the airflow channel is a key factor affecting heat dissipation. The present invention uses the equivalent length of multiple quarter-wavelength tubes and the aperture of the airflow channel as design factors for the design length of multiple anechoic cavities. Compared with the solution of directly using the equivalent length of the quarter-wavelength tube as the design length of the anechoic cavity, the acoustic metamaterial structure can better balance noise reduction and heat dissipation, and has a better noise reduction effect while meeting the heat dissipation requirements.

[0049] The design method of the present invention has the beneficial effects of being scientific, reasonable, simple and easy to operate.

[0050] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0052] Figure 1 is a schematic flow chart of a design method of an acoustic metamaterial structure in one embodiment of the present invention;

[0053] Figure 2 is a schematic flow chart of a design method of an acoustic metamaterial structure in one embodiment of the present invention;

[0054] Figure 3 is a schematic flow chart of a design method of an acoustic metamaterial structure in one embodiment of the present invention;

[0055] Figure 4 is a schematic flow chart of a design method of an acoustic metamaterial structure in one embodiment of the present invention;

[0056] Figure 5 is a schematic flow chart of a design method of an acoustic metamaterial structure in one embodiment of the present invention;

[0057] Figure 6 is a schematic flow chart of a design method of an acoustic metamaterial structure in one embodiment of the present invention;

[0058] Figure 7 is a schematic flow chart of a design method of an acoustic metamaterial structure in one embodiment of the present invention;

[0059] Figure 8 is a schematic flow chart of a design method of an acoustic metamaterial structure in one embodiment of the present invention;

[0060] Fig. 9 is a schematic flow chart of a design method of an acoustic metamaterial structure in one embodiment of the present invention;

[0061] Fig.10 is a schematic structural diagram of an acoustic metamaterial noise reduction device according to an embodiment of the present invention;

[0062] Fig.11 is a schematic structural diagram of an internal anechoic cavity of an acoustic metamaterial noise reduction device according to an embodiment of the present invention;

[0063] Fig.12 is a schematic structural diagram of a refrigerator according to one embodiment of the present invention. DETAILED DESCRIPTION

[0064] Refer to the following Figures 1 to 12 To describe the design method of the refrigerator, acoustic metamaterial noise reduction device and acoustic metamaterial structure of the embodiment of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0065] Unless otherwise clearly defined and limited, the terms "set", "install", "connect", "connect", "fix", "couple" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0066] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0067] In the description of the present embodiment, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0068] Figure 1 is a schematic flow chart of the design method of acoustic metamaterial structure, such as Figure 1 As shown, and refer to Figures 2 to 9 , an embodiment of the present invention provides a design method for an acoustic metamaterial structure.

[0069] The design model of the acoustic metamaterial structure includes an airflow channel 101 and a plurality of silencing cavities 103 , wherein the inlet 102 of the silencing cavity 103 is located on the channel wall of the airflow channel 101 .

[0070] like Figure 1 As shown, the design method of the acoustic metamaterial structure may generally include:

[0071] Step S100, obtaining the noise spectrum of the target device operating noise.

[0072] Step S200, obtaining equivalent lengths of a plurality of quarter-wavelength tubes at least according to the noise spectrum.

[0073] Step S300, obtaining the design lengths of a plurality of muffler cavities according to the equivalent length and the aperture of the air flow channel.

[0074] In this embodiment, the target operating device may be a refrigerator, or other device that requires noise reduction.

[0075] In this embodiment, the equivalent lengths of multiple quarter-wavelength tubes are obtained based on at least the noise spectrum of the target device operating noise, and then the design lengths of multiple anechoic cavities are obtained according to the equivalent lengths of the multiple quarter-wavelength tubes and the apertures of the airflow channels. The above method can be used to quickly design a design model of an acoustic metamaterial structure.

[0076] The design model includes multiple anechoic cavities, each of which can reduce noise in a noise frequency band. In other words, each anechoic cavity can achieve broadband noise reduction, so that multiple anechoic cavities can reduce noise in all frequency bands of the noise spectrum, thereby improving the noise reduction effect of the acoustic metamaterial noise reduction device and achieving the purpose of improving user experience.

[0077] The aperture size of the airflow channel is a key factor affecting heat dissipation. This embodiment uses the equivalent length of multiple quarter-wavelength tubes and the aperture of the airflow channel as design factors for the design length of multiple anechoic cavities. Compared with the solution of directly using the equivalent length of the quarter-wavelength tube as the design length of the anechoic cavity, the design model of the acoustic metamaterial structure can better balance noise reduction and heat dissipation, and has a better noise reduction effect while meeting the heat dissipation requirements.

[0078] The design method of the present invention has the beneficial effects of being scientific, reasonable, simple and easy to operate.

[0079] In some embodiments of the present invention, the design length of each muffler cavity satisfies the following formula:

[0080]

[0081] Among them, H n is the equivalent length of the nth quarter-wavelength tube; H is the design length of the nth anechoic cavity; and D is the aperture of the airflow channel.

[0082] This embodiment provides a specific algorithm for calculating the design length of the muffler cavity. The design length of each muffler cavity can be quickly and accurately calculated through the above calculation formula.

[0083] In some optional embodiments of the present invention, Figure 2 As shown, step S200, obtaining the equivalent lengths of a plurality of quarter-wavelength tubes at least according to the noise spectrum includes:

[0084] Step S201, extracting a target frequency value from a noise spectrum.

[0085] Step S202, obtaining target transmission losses of a plurality of quarter-wavelength tubes.

[0086] Step S203, obtaining equivalent lengths of the plurality of quarter-wavelength tubes based on the target frequency value and the target transmission losses of the plurality of quarter-wavelength tubes.

[0087] This embodiment provides a specific method for calculating the equivalent length of a quarter-wavelength tube. There may be multiple target frequencies, each of which corresponds to a specific target noise frequency band. Based on each target frequency, this embodiment can obtain the equivalent length of the corresponding quarter-wavelength tube under the condition that the corresponding target transmission loss can be met.

[0088] Furthermore, the design length of the anechoic cavity obtained based on the equivalent length of the quarter-wavelength tube can enable each anechoic cavity to reduce noise in different noise frequency bands and meet the corresponding target transmission loss.

[0089] In some embodiments of the present invention, the equivalent length of each quarter-wavelength tube satisfies the following formula:

[0090]

[0091] Among them, TL n is the target transmission loss of the nth quarter-wavelength tube; a is the ratio of the cross-sectional area of ​​the nth quarter-wavelength tube to the cross-sectional area of ​​the airflow channel; k is the wave number corresponding to the target frequency value; H n is the equivalent length of the nth quarter-wavelength tube.

[0092] This embodiment provides a specific algorithm for calculating the equivalent length of each quarter-wavelength tube, through which the equivalent length of each quarter-wavelength tube can be quickly and accurately calculated, thereby further improving the design efficiency and design accuracy of the design model of the acoustic metamaterial structure.

[0093] In some optional embodiments of the present invention, the calculation formula of the wave number corresponding to the target frequency value is as follows:

[0094]

[0095] Wherein, λ is the wavelength of the sound wave corresponding to the target frequency value.

[0096] In some optional embodiments of the present invention, the calculation formula of the wavelength of the sound wave corresponding to the target frequency value is as follows:

[0097] λ=C / f

[0098] Where, f is the target frequency value;

[0099] C is the sound velocity constant.

[0100] Furthermore, in some optional embodiments of the present invention, the method for designing an acoustic metamaterial structure further includes: step S204, obtaining a total target transmission loss of the acoustic metamaterial structure.

[0101] In the step of obtaining target transmission losses of a plurality of quarter-wavelength tubes (step S202), the target transmission losses of the plurality of quarter-wavelength tubes satisfy the following conditions:

[0102]

[0103] Among them, TL n is the target transmission loss of the nth quarter-wavelength tube; TL is the total target transmission loss of the acoustic metamaterial structure.

[0104] This embodiment defines the constraint condition of the target transmission loss of the quarter-wavelength tube, that is, the sum of the target transmission losses of multiple quarter-wavelength tubes is equal to the total target transmission loss of the acoustic metamaterial structure.

[0105] By setting the above constraints, this embodiment is more conducive to quickly and accurately obtaining the target transmission loss of each quarter-wavelength tube under the premise of satisfying the total target transmission loss of the acoustic metamaterial structure, so that the equivalent length of each quarter-wavelength tube can be quickly and accurately calculated, thereby further improving the design efficiency of the design model. In addition, this embodiment is also conducive to achieving the target noise reduction effect.

[0106] In some optional embodiments of the present invention, Figure 3 As shown, step S201, extracting the target frequency value in the noise spectrum includes:

[0107] Step S2011: extract multiple target noise frequency bands in the noise spectrum.

[0108] Step S2012: taking the noise frequency value corresponding to the maximum noise peak value in each target noise frequency band as the target frequency value of each target noise frequency band.

[0109] In some optional embodiments of the present invention, Figure 4 As shown, step S201, extracting the target frequency value in the noise spectrum includes:

[0110] Step S2011: extract multiple target noise frequency bands in the noise spectrum.

[0111] Step S2013: taking an average value of noise frequency values ​​corresponding to a plurality of noise peaks in each target noise frequency band as a target frequency value of each target noise frequency band.

[0112] In some optional embodiments of the present invention, Figure 5 As shown, step S201, extracting the target frequency value in the noise spectrum includes:

[0113] Step S2011: extract multiple target noise frequency bands in the noise spectrum.

[0114] Step S2014: taking the middle noise frequency value in each target noise frequency band as the target frequency value of each target noise frequency band.

[0115] In some optional embodiments of the present invention, Figure 6 As shown, the design method of the acoustic metamaterial structure also includes:

[0116] Step S400: obtaining the available spatial volume of the acoustic metamaterial structure.

[0117] Step S500: acquiring the cross-sectional area of ​​the airflow channel and the cross-sectional area of ​​the quarter-wavelength tube based on the available space volume and the heat dissipation efficiency of the acoustic metamaterial structure.

[0118] The ratio of the cross-sectional area of ​​the quarter-wavelength tube to the cross-sectional area of ​​the airflow channel is an influencing factor of the equivalent length of the quarter-wavelength tube. In this embodiment, based on the available space volume and heat dissipation efficiency of the acoustic metamaterial structure, the cross-sectional area of ​​the airflow channel and the cross-sectional area of ​​the quarter-wavelength tube are obtained, which is conducive to a more scientific and reasonable equivalent length of the quarter-wavelength tube, so that not only the anechoic cavity has a good noise reduction effect, but also the airflow channel has a good heat dissipation effect.

[0119] Further, in some optional embodiments of the present invention, such as Figure 7 As shown, after step S500, the method for designing an acoustic metamaterial structure further includes:

[0120] Step S600, obtaining the shape and distribution of the anechoic cavity based on the available space volume of the acoustic metamaterial structure, the designed length of the anechoic cavity, the cross-sectional area of ​​the airflow channel and the cross-sectional area of ​​the quarter-wavelength tube.

[0121] This embodiment provides a specific method for designing the shape and distribution of the silencing cavity. By adopting the above method, the shape and distribution of the silencing cavity can meet the actual use requirements, so as to facilitate actual production and manufacturing.

[0122] In some optional embodiments of the present invention, Figure 8 As shown, after step S2011, the method for designing an acoustic metamaterial structure further includes: step S700, obtaining the number of the anechoic cavities according to a plurality of target noise frequency bands.

[0123] Further, at least one target noise frequency band has an overlapping noise frequency band with another target noise frequency band.

[0124] Specifically, one anechoic cavity corresponds to one target noise frequency band, and one target noise frequency band and another target noise frequency band may have overlapping noise frequency bands. Thus, the noise reduction frequency bands of each anechoic cavity can be different, but there are crossover frequencies. For example, the target noise frequency band corresponding to one anechoic cavity is 100-500 Hz, and the target noise frequency band corresponding to another anechoic cavity is 300-800 Hz.

[0125] In this embodiment, a specific method for obtaining the number of anechoic cavities is provided, and each target frequency band corresponds to one anechoic cavity, which is more conducive to quickly obtaining a design model.

[0126] In some optional embodiments of the present invention, the method for designing an acoustic metamaterial structure further includes the following steps: obtaining the available space volume of the acoustic metamaterial structure; and obtaining the aperture of the airflow channel based on the available space volume and heat dissipation efficiency of the acoustic metamaterial structure.

[0127] In some optional embodiments of the present invention, the aperture of the air flow channel is 1-1000 mm.

[0128] The aperture of the airflow channel is a key factor affecting heat dissipation, and it can be selected according to actual heat dissipation requirements.

[0129] For example, the aperture of the air flow channel may be 1 mm, 100 mm, 200 mm, 300 mm, 400 mm, 600 mm, 800 mm or 1000 mm.

[0130] Furthermore, when the acoustic metamaterial structure is used in a refrigerator, the aperture of the airflow channel is 20 to 80 mm.

[0131] For example, the aperture of the air flow channel may be 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm or 80 mm.

[0132] When the acoustic metamaterial structure is used in a refrigerator, the aperture of the airflow channel is obtained by combining the diameters of the heat dissipation windows on both sides of the refrigerator compressor compartment.

[0133] In some embodiments of the present invention, Fig. 9 As shown, the design method of the acoustic metamaterial structure includes the following steps:

[0134] Step S1, obtaining the noise spectrum of the target device operating noise.

[0135] Step S2, extracting multiple target noise frequency bands in the noise spectrum.

[0136] Step S3, taking the noise frequency value corresponding to the maximum noise peak in each target noise frequency band as the target frequency value of each target noise frequency band; or taking the average of the noise frequency values ​​corresponding to multiple noise peaks in each target noise frequency band as the target frequency value of each target noise frequency band; or taking the middle noise frequency value in each target noise frequency band as the target frequency value of each target noise frequency band.

[0137] Step S4, obtaining the number of quarter-wavelength tubes according to a plurality of target noise frequency bands; at least one target noise frequency band has an overlapping noise frequency band with another target noise frequency band.

[0138] Step S5, obtaining the available spatial volume of the acoustic metamaterial structure.

[0139] Step S6, based on the available space volume and heat dissipation efficiency of the acoustic metamaterial structure, the cross-sectional area of ​​the airflow channel and the cross-sectional area of ​​the quarter-wavelength tube are obtained.

[0140] Step S7, obtaining the total target transmission loss of the acoustic metamaterial structure.

[0141] Step S8, according to the formula and formula The equivalent length of each quarter-wavelength tube is obtained. Among them, TL n is the target transmission loss of the nth quarter-wavelength tube; a is the ratio of the cross-sectional area of ​​the nth quarter-wavelength tube to the cross-sectional area of ​​the airflow channel; k is the wave number corresponding to the target frequency value; H n is the equivalent length of the nth quarter-wavelength tube; TL is the total target transmission loss of the acoustic metamaterial structure.

[0142] Step S9, obtaining the aperture of the airflow channel based on the available space volume and heat dissipation efficiency of the acoustic metamaterial structure.

[0143] Step S10, according to the formula The design length of each anechoic cavity is obtained.

[0144] Step S11, based on the available space volume of the acoustic metamaterial structure, the designed length of the anechoic cavity, the cross-sectional area of ​​the airflow channel and the cross-sectional area of ​​the quarter-wavelength tube, the shape and distribution of the anechoic cavity are obtained.

[0145] The number of quarter-wavelength tubes and the number of anechoic cavities are in one-to-one correspondence. The cross-sectional area of ​​the quarter-wavelength tube is the cross-sectional area of ​​the anechoic cavity. There is no existing sequence between step S3 and step S4. There is no sequence between step 2, step 5 and step 6. There is no sequence between step S7 and step S9.

[0146] like Figure 10-11As shown, an embodiment of the present invention further provides an acoustic metamaterial noise reduction device 100 .

[0147] The acoustic metamaterial noise reduction device includes an acoustic metamaterial structure, and a design model for manufacturing the acoustic metamaterial structure is obtained by at least one of the design methods described in any one of the above embodiments.

[0148] The acoustic metamaterial noise reduction device 100 of this embodiment can be used in equipment such as refrigerators or freezers.

[0149] Due to the acoustic metamaterial structure of the acoustic metamaterial noise reduction device in the present invention, the above-mentioned design method is used to manufacture the design model of the acoustic metamaterial structure 100. Therefore, the acoustic metamaterial noise reduction device in this embodiment can achieve broadband noise reduction and have a good heat dissipation effect while ensuring the heat dissipation effect, thereby improving the user experience.

[0150] Furthermore, in some optional embodiments of the present invention, the acoustic metamaterial noise reduction device 100 further includes a connection structure. The connection structure is configured to achieve installation of the acoustic metamaterial structure in an installation space on a target device.

[0151] When in use, the acoustic metamaterial noise reduction device is installed on the target device for noise reduction. Specifically, the acoustic metamaterial structure is installed on the target device through a connecting structure.

[0152] In this embodiment, the acoustic metamaterial noise reduction device can achieve broadband noise reduction for the target device, thereby having a good noise reduction effect on the target device, thereby improving the user experience.

[0153] In some optional embodiments of the present invention, the acoustic metamaterial structure is a sound absorbing metamaterial.

[0154] The sound-absorbing metamaterial (MAT metamaterial, MAT is the abbreviation of Metamaterial Absorption Technology) uses a synthetic material with high sound absorption efficiency, and there is a complex maze pattern structure on it. Each maze channel can absorb specific frequencies, and its sound absorption efficiency is as high as 99%. In addition, compared with general sound-absorbing materials, the chemical properties of sound-absorbing metamaterials are more stable, safer, odorless, elastic, fire-retardant, mildew-proof and anti-bacterial, and have a good feel and weight.

[0155] like Fig.12 As shown, an embodiment of the present invention further provides a refrigerator.

[0156] The refrigerator includes a cabinet 200 .

[0157] A compressor compartment 300 is disposed in the box 200. The box also contains an acoustic metamaterial noise reduction device 100 as described in any of the above embodiments. The airflow channel 101 of the acoustic metamaterial noise reduction device 100 is connected to the inner side of the compressor compartment 300. The acoustic metamaterial noise reduction device 100 includes an acoustic metamaterial structure 100.

[0158] During the operation of the refrigerator compressor, the noise in the compressor compartment 300 propagates from the inside to the outside. When passing through the acoustic metamaterial noise reduction device, the noise enters the muffler cavity 103 through the inlet 102 on the channel wall of the airflow channel 101, thereby achieving noise reduction of the compressor compartment, and then achieving noise reduction of the entire refrigerator. In addition, the airflow channel 101 also has the function of heat dissipation for the compressor compartment 300.

[0159] Since the refrigerator of this embodiment adopts the above-mentioned acoustic metamaterial noise reduction device, it can achieve broadband noise reduction and has a good noise reduction effect, thereby improving the user experience.

[0160] Furthermore, in some embodiments of the present invention, a heat dissipation window is provided on at least one side of the compartment wall of the compressor compartment 300, and the acoustic metamaterial noise reduction device 100 can be provided in the heat dissipation window.

[0161] In some optional embodiments of the present invention, the acoustic metamaterial noise reduction device 100 can be arranged on the inner side of the warehouse wall of the compressor warehouse 300, and a through hole is opened on the corresponding warehouse wall, and the through hole is connected to the air flow channel.

[0162] In some optional embodiments of the present invention, the acoustic metamaterial noise reduction device 100 can be arranged on the outer side of the warehouse wall of the compressor warehouse 300, and a through hole is opened on the corresponding warehouse wall, and the through hole is connected to the air flow channel.

[0163] The refrigerator includes a housing 200 , and a compressor compartment 300 is disposed at the bottom of the housing 200 .

[0164] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A method for designing an acoustic metamaterial structure, characterized in that: The design model of the acoustic metamaterial structure includes an airflow channel and a plurality of silencing cavities, wherein the inlet of the silencing cavity is located on the channel wall of the airflow channel; The design method comprises: Obtain the noise spectrum of the target device's operating noise; Obtaining equivalent lengths of a plurality of quarter-wavelength tubes at least according to the noise spectrum; The design lengths of the multiple muffler cavities are obtained according to the equivalent length and the aperture of the air flow channel.

2. The design method according to claim 1, characterized in that: The design length of each muffler cavity satisfies the following formula: Among them, H n is the equivalent length of the nth quarter-wavelength tube; H is the design length of the nth anechoic cavity; D is the aperture of the air flow channel.

3. The design method according to claim 1, characterized in that: The step of obtaining the equivalent lengths of a plurality of quarter-wavelength tubes at least according to the noise spectrum comprises: Extracting a target frequency value from the noise spectrum; Obtain target transmission losses for multiple quarter-wavelength tubes; Based on the target frequency value and the target transmission losses of the quarter-wavelength tubes, the equivalent lengths of the quarter-wavelength tubes are obtained.

4. The design method according to claim 3, characterized in that: The equivalent length of each quarter-wavelength tube satisfies the following formula: Among them, TL n is the target transmission loss of the nth quarter-wavelength tube; a is the ratio of the cross-sectional area of ​​the nth quarter-wavelength tube to the cross-sectional area of ​​the air flow channel; k is the wave number corresponding to the target frequency value; H n is the equivalent length of the nth quarter-wavelength tube.

5. The design method according to claim 4, characterized in that: The design method further includes: obtaining a total target transmission loss of the acoustic metamaterial structure; In the step of obtaining target transmission losses of a plurality of quarter-wavelength tubes, the target transmission losses of the plurality of quarter-wavelength tubes satisfy the following conditions: Among them, TL n is the target transmission loss of the nth quarter-wavelength tube; TL is the total target transmission loss of the acoustic metamaterial structure.

6. The design method according to claim 3, characterized in that: The step of extracting the target frequency value in the noise spectrum comprises: extracting a plurality of target noise frequency bands in the noise spectrum; Using the noise frequency value corresponding to the maximum noise peak value in each of the target noise frequency bands as the target frequency value of each of the target noise frequency bands; or taking an average value of noise frequency values ​​corresponding to a plurality of noise peaks in each of the target noise frequency bands as the target frequency value of each of the target noise frequency bands; or The middle noise frequency value in each of the target noise frequency bands is used as the target frequency value of each of the target noise frequency bands.

7. The design method according to claim 1, characterized in that: Also includes: Obtaining the available spatial volume of the acoustic metamaterial structure; Based on the available space volume and heat dissipation efficiency of the acoustic metamaterial structure, obtaining the cross-sectional area of ​​the airflow channel and the cross-sectional area of ​​the quarter-wavelength tube; The shape and distribution of the anechoic cavity are obtained based on the available spatial volume of the acoustic metamaterial structure, the designed length of the anechoic cavity, the cross-sectional area of ​​the airflow channel and the cross-sectional area of ​​the quarter-wavelength tube.

8. The design method according to claim 6, characterized in that: Also includes: According to a plurality of target noise frequency bands, obtaining the number of the anechoic chambers; At least one target noise frequency band has an overlapping noise frequency band with another target noise frequency band.

9. An acoustic metamaterial noise reduction device, characterized in that: include: An acoustic metamaterial structure, wherein a design model for manufacturing the acoustic metamaterial structure is obtained by at least one of the design methods described in any one of claims 1 to 8.

10. A refrigerator, characterized in that: include: A box body, wherein a compressor compartment is arranged in the box body, and the box body is also provided with an acoustic metamaterial noise reduction device as described in claim 9, wherein the air flow channel of the acoustic metamaterial noise reduction device is connected to the inner side of the compressor compartment.

Images