Soundproofing cotton, compressor and air conditioner

Abstract

This invention provides a sound insulation cotton, a compressor, and an air conditioner, relating to the field of compressor technology. It solves the technical problems of poor low-frequency noise suppression, narrow noise reduction bandwidth, complex manufacturing process, and high cost associated with sound insulation cotton structures. The sound insulation cotton includes a low-frequency noise control layer and a mid-to-high-frequency noise control layer. The low-frequency noise control layer includes a substrate and resonant units. The substrate is made of cork material. The resonant units are arranged periodically on the substrate. The mid-to-high-frequency noise control layer is made of environmentally friendly porous fiber sound insulation cotton material. The sound insulation cotton of this invention contains periodic metamaterial units, forming a negative equivalent mass density at specific frequencies, exhibiting a low-frequency elastic wave bandgap. It has a significant suppression effect on low-frequency noise below 500Hz, and can achieve broadband noise reduction by adhering ordinary sound insulation cotton material. It also features a simple structure, small overall thickness, ease of processing and installation, wide availability of materials, low cost, environmental friendliness, and wide applicability.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a sound insulation cotton, a compressor, and an air conditioner. Background Technology

[0002] Electromagnetic noise, aerodynamic noise, and mechanical noise in the compressor are the main noise sources of air conditioning systems. These noises are internally excited, transmitted to the casing and distributor in the form of vibrations, and radiated outwards, contributing up to 80% of the system's noise energy. Noise can be categorized into low-frequency, mid-frequency, and high-frequency noise according to wavelength, with low-frequency noise being difficult to capture efficiently due to its extremely strong penetrating power. Current passive noise reduction methods in air conditioning systems mainly involve wrapping the compressor with sound-absorbing cotton. The structure of this material is primarily divided into single-layer sound-absorbing / insulating materials and composite structures composed of multiple layers of sound-absorbing and insulating materials. Figure 1 As shown, the prior art discloses a sound insulation cotton, comprising three layers of sound-absorbing material and a sound-insulating material layer stitched together with each other at different densities. This sound insulation cotton structure is not only quite thick but also has a complex manufacturing process. Figure 2 As shown, the prior art also discloses a composite board composed of a flame-retardant non-woven fiber layer, a rubber foam layer, a calendered soft rubber layer, a plastic foam layer, and a hard rubber layer. This type of board has a complex structure, a large thickness, and a high cost, which is not conducive to practical application. Moreover, the sound insulation cotton in the prior art still has problems such as poor control effect of low and medium frequency noise, large composite structure thickness, complex structure, and high cost in practical applications.

[0003] Furthermore, in line with the current dual-carbon strategy, improving resource utilization, energy conservation and emission reduction, and cost reduction and efficiency improvement have gradually become a theme in product development. In this context, using recycled materials can reduce the waste of raw materials and energy, aligning with sustainable development design principles.

[0004] Based on the above background, the present invention aims to design a new type of sound insulation cotton with excellent low-frequency noise reduction characteristics and a wide noise reduction frequency band, using a low-cost, widely available green and environmentally friendly material as the base. Summary of the Invention

[0005] The purpose of this invention is to provide a sound insulation cotton, a compressor, and an air conditioner to solve the technical problems of poor low-frequency noise suppression effect, narrow noise reduction bandwidth, complex process, and high cost of the existing sound insulation cotton structure.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides a sound insulation cotton with a composite double-layer structure, comprising a low-frequency noise control layer and a mid-to-high-frequency noise control layer; wherein:

[0008] The low-frequency noise control layer includes a substrate and resonant units; the substrate is made of cork material and has an internal cavity; the resonant units are arranged periodically on the substrate.

[0009] The mid-to-high frequency noise control layer is made of environmentally friendly porous fiber sound insulation cotton material.

[0010] This invention provides a sound insulation cotton, comprising a low-frequency noise control layer for low-frequency noise insulation and a mid-to-high-frequency noise control layer for mid-to-high-frequency noise insulation. It can comprehensively cover noise of different frequencies. By using cork material to make the base and periodically arranging resonant units, equivalent to a spring-oscillator unit, the density difference between the two results in opposite response directions to excitation in a certain low-frequency band, forming a negative equivalent mass density and creating an elastic wave bandgap to suppress low-frequency noise. It has a significant suppression effect on low-frequency noise below 500Hz. Broadband noise reduction can be achieved by adhering ordinary sound insulation cotton material. The base has an internal cavity that can suppress noise above 500Hz. Using environmentally friendly recycled cork material for the base results in a simple structure, small overall thickness, easy processing and installation, wide material availability, low cost, environmental friendliness, and wide applicability.

[0011] As a further improvement of the present invention, the low-frequency noise control layer and the mid-to-high frequency noise control layer are bonded together by adhesive.

[0012] As a further improvement of the present invention, the substrate comprises at least two cork materials with different geometrical physical parameters; wherein the geometrical physical parameters include thickness, porosity, density and elastic modulus.

[0013] As a further improvement of the present invention, the substrate includes a frame and a biaxially stretched cork film material with a certain prestress fixed within the frame.

[0014] As a further improvement of the present invention, the base is circular or square.

[0015] As a further improvement of the present invention, the substrate has a uniform thickness, or the substrate is a variable thickness structure.

[0016] The base of the sound insulation cotton of the present invention can be composed of cork materials with different geometric and physical parameters such as thickness, porosity, density and elastic modulus. The characteristic frequency can also be adjusted by fixing the cork material after biaxial stretching. Its outer contour can be circular, square or arbitrary, and the thickness can be uniform or variable cross-section, which can suppress noise in different frequency bands and achieve broadband vibration reduction and noise reduction. The predetermined acoustic characteristics can be obtained by designing the base. Different cork materials can be used, or different geometric and physical properties can be obtained by processing the same material with different processes to achieve different characteristics, such as controlling the porosity by calendering.

[0017] As a further improvement of the present invention, the resonant unit is made of recycled waste metal material with a density greater than that of the substrate; the resonant unit is inserted into the substrate.

[0018] To ensure that the characteristic frequency of the low-frequency noise control layer is low, the resonant unit can be made of any material with a high density. For environmental reasons, low-cost raw materials such as recycled screws and bolts can be used. The predetermined acoustic characteristics can be obtained by controlling the geometric dimensions of the resonant unit.

[0019] As a further improvement of the present invention, the distance between adjacent resonant units is different.

[0020] The periodically arranged resonant units are directly nailed into the cork substrate for mating; different noise reduction frequency bands can be obtained by designing different distances between the resonant units.

[0021] As a further improvement of the present invention, all of the resonant units may have the same or different specifications.

[0022] As a further improvement of the present invention, at least one through hole is provided on the substrate.

[0023] As a further improvement of the present invention, the through hole is filled with damping or sound-absorbing material.

[0024] As a further improvement of the present invention, the substrate includes several partitions, and at least one resonant unit is uniformly disposed in each partition; the resonant unit in different partitions has different structural dimensions; and the number of resonant units in each partition is different.

[0025] To better reduce vibration and noise, a refined and modular design can be implemented to address specific noise issues. Specifically, the peak noise frequency of a particular model can be set as the target frequency, and variables such as the thickness of the cork base, the geometric dimensions of the resonant unit, and the distribution distance can be used as optimization parameters. The parameter values ​​can be derived based on the optimization algorithm to achieve the effect of structural optimization.

[0026] As a further improvement of the present invention, the environmentally friendly porous fiber sound insulation cotton material includes felt.

[0027] The sound insulation cotton of this invention is a novel type of sound insulation cotton. It contains periodic metamaterial units that form a negative equivalent mass density at a specific frequency and have a low-frequency elastic wave bandgap. It has a significant suppression effect on low-frequency noise below 500Hz. It can achieve broadband noise reduction by adhering ordinary sound insulation cotton materials. It has a simple structure, small overall thickness, is easy to process and install, has a wide range of material sources, low cost, is green and environmentally friendly, and has wide applicability.

[0028] The present invention provides a compressor, including the sound-insulating cotton.

[0029] The compressor provided by this invention includes a multi-layer composite sound insulation cotton, divided into a low-frequency noise (below 500Hz) control layer and a mid-to-high frequency noise (above 500Hz) control layer. The low-frequency noise control layer consists of a cork base and periodically arranged resonant units (such as screws). The cork base contains an internal cavity and possesses a certain sound absorption capacity. At specific low-frequency frequencies, the vibrations of the base and resonant units respond to excitation in opposite directions, with the equivalent displacement approaching zero, forming a negative equivalent mass density, resulting in good noise suppression. The mid-to-high frequency noise control layer uses common environmentally friendly sound insulation cotton material. The two are bonded together with adhesive. By employing this new type of sound insulation cotton, the noise problem in the compressor system application process is solved, addressing the issues of poor low-frequency noise suppression, narrow noise reduction bandwidth, complex manufacturing process, and high cost associated with existing sound insulation cotton structures.

[0030] The present invention provides an air conditioner, which includes the sound insulation cotton; or, includes the compressor. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of sound insulation cotton in existing technology;

[0033] Figure 2 This is a schematic diagram of the structure of composite panels in the prior art;

[0034] Figure 3 This is a cross-sectional structural schematic diagram of one embodiment of the sound insulation cotton of the present invention;

[0035] Figure 4This is a top view of an embodiment of the low-frequency noise control layer in the sound insulation cotton of the present invention;

[0036] Figure 5 This is a front view of an embodiment of the resonant unit in the low-frequency noise control layer of the present invention;

[0037] Figure 6 This is a schematic diagram of another embodiment of the low-frequency noise control layer in the sound insulation cotton of the present invention;

[0038] Figure 7 This is a top view of the third embodiment of the low-frequency noise control layer in the sound insulation cotton of the present invention;

[0039] Figure 8 This is a top view of the fourth embodiment of the low-frequency noise control layer in the sound insulation cotton of the present invention.

[0040] In the figure: 1. Mid-to-high frequency noise control layer; 2. Low frequency noise control layer; 21. Substrate; 22. Resonant unit; 23. Frame; 24. Through hole; 10. Partition. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0042] Example 1

[0043] like Figure 3 As shown, the present invention provides an environmentally friendly sound insulation cotton with excellent low-frequency noise reduction capability and wide frequency characteristics. It is simple in structure, easy to process, and low in cost. It is a composite double-layer structure, including a low-frequency noise (below 500Hz) control layer 2 and a mid-to-high frequency noise control layer 1. The low-frequency noise control layer 2 and the mid-to-high frequency noise control layer 1 are bonded together by adhesive.

[0044] The low-frequency noise control layer 2 includes a substrate 21 and a resonant unit 22;

[0045] Specifically, the substrate 21 is made of cork material and has an internal cavity. In this embodiment, the substrate 21 uses a type of cork material, specifically recycled wine bottle stoppers, which are produced through processes such as sintering, bonding, heating, and compression. The porosity, shape (cubic or cylindrical), and dimensions (length, width, height, diameter, constant thickness, variable cross-sectional thickness, etc.) can be adjusted according to actual needs. Cork is a plant tissue with advantages such as wear resistance, water resistance, corrosion resistance, non-toxicity, and biodegradability. More importantly, this material has superior sound absorption properties compared to other natural materials and processed wood. On the other hand, cork is mainly used in the wine and footwear industries. After recycling, it can be made into boards and films of environmentally friendly materials through simple processing (sintering, bonding, heating, compression, and cooling, etc.) at a low cost.

[0046] The resonant units 22 are arranged periodically on the substrate 21;

[0047] The mid-to-high frequency noise control layer 1 is made of environmentally friendly porous fiber sound insulation cotton material. Specifically, the environmentally friendly porous fiber sound insulation cotton material includes felt, that is, the mid-to-high frequency noise control layer 1 can be made of common porous fiber materials such as felt, used to absorb and block mid-to-high frequency sound, and is bonded to the low-frequency noise control layer 2 with adhesive.

[0048] This invention provides a sound insulation cotton, comprising a low-frequency noise control layer 2 for low-frequency noise insulation and a mid-to-high-frequency noise control layer 1 for mid-to-high-frequency noise insulation. It can comprehensively cover noise of different frequencies. A base 21 is made of cork material, with periodically arranged resonant units 22, equivalent to a spring-oscillator unit. Due to the density difference between the two, a negative equivalent mass density is formed in a certain low-frequency band, creating an elastic wave bandgap to suppress low-frequency noise. It has a significant suppression effect on low-frequency noise below 500Hz. Broadband noise reduction can be achieved by adhering ordinary sound insulation cotton material. The base 21 has an internal cavity to form a sound-absorbing cavity, which can suppress noise above 500Hz. The base 21 is made of environmentally friendly recycled cork material, resulting in a simple structure, small overall thickness, easy processing and installation, wide material availability, low cost, green environmental protection, and wide applicability.

[0049] like Figure 4 The figure shown is a top view of an embodiment of the low-frequency noise control layer of the present invention. As can be seen in the figure, four rows of resonant units 22 are arranged on the substrate 21. Each row of resonant units 22 has four units, forming a 4x4 resonant unit 22 combination. The width and height between adjacent resonant units 22 are both a, and the overall arrangement is in an array form.

[0050] Specifically, a single resonant unit 22 and the cork substrate 21 can be equivalent to a spring-oscillator unit. Due to the density difference between the two, a negative equivalent mass density is formed in a certain low-frequency band, creating an elastic wave bandgap to suppress low-frequency noise. In addition, the spacing between the periodically arranged resonant units 22 is 'a', and the noise reduction frequency band can be adjusted by adjusting the spacing 'a' and the size of the resonant unit 22.

[0051] It should be noted that in this invention, the resonant unit 22 is made of recycled metal material with a density greater than that of the substrate 21; the density of cork is 120-220 kg / m³. 3 The resonant unit 22 can be made of a metal material with a higher density than itself, such as iron, steel, etc.

[0052] The resonant unit 22 is inserted into the substrate 21.

[0053] like Figure 5 As shown, in order to make the characteristic frequency of the low-frequency noise control layer 2 lower, the resonant unit 22 can be made of any material with a high density. For environmental protection reasons, waste screws, bolts, tacks and other low-cost raw materials can be recycled and directly nailed into the cork base 21 to form a fit. The predetermined acoustic characteristics can be obtained by controlling the geometric dimensions of the resonant unit 22.

[0054] It should be noted here that when the resonant unit 22 is made of screws, such as M5, M6, and M8 screws, the geometric dimensions of the resonant unit 22 include the length, diameter, and pitch of the screws. In other words, screws of different lengths, diameters, and pitches can be selected according to actual needs.

[0055] In this embodiment, the base 21 is circular or square, but of course, any other shape can be used.

[0056] As a further improvement of the present invention, the substrate 21 has a uniform thickness, or the substrate 21 has a variable thickness structure.

[0057] As a further improvement of the present invention, the distance between adjacent resonant units 22 is different.

[0058] The periodically arranged resonant units 22 are directly nailed into the cork substrate 21 for mating; different noise reduction frequency bands can be obtained by designing different distances between the resonant units 22.

[0059] As a further improvement of the present invention, all resonant units 22 may have the same or different specifications.

[0060] When in use, the sound insulation cotton can be wrapped or adhered to the compressor or air conditioner panel using Velcro / glue to achieve noise reduction.

[0061] Example 2:

[0062] In this embodiment, as Figure 1 As shown, an environmentally friendly sound insulation cotton with excellent low-frequency noise reduction capability and wide bandwidth characteristics is provided. It is simple in structure, easy to process, and low in cost. It has a composite double-layer structure, including a low-frequency noise control layer 2 and a mid-to-high frequency noise control layer 1. The low-frequency noise control layer 2 and the mid-to-high frequency noise control layer 1 are bonded together with adhesive.

[0063] The low-frequency noise control layer 2 includes a substrate 21 and a resonant unit 22;

[0064] Specifically, the substrate 21 is made of cork material and has an internal cavity; in this embodiment, the substrate 21 is not made of a single cork material, but rather includes at least two cork materials with different geometric and physical parameters; wherein, the geometric and physical parameters include thickness, porosity, density and elastic modulus.

[0065] The resonant units 22 are arranged periodically on the substrate 21;

[0066] The mid-to-high frequency noise control layer 1 is made of environmentally friendly porous fiber sound insulation cotton material. Specifically, the environmentally friendly porous fiber sound insulation cotton material includes felt, that is, the mid-to-high frequency noise control layer 1 can be made of common porous fiber materials such as felt, used to absorb and block mid-to-high frequency sound, and is bonded to the low-frequency noise control layer 2 with adhesive.

[0067] In this embodiment, as Figure 4 As shown in the figure, four rows of resonant units 22 are arranged on the substrate 21. Each row of resonant units 22 has four units, forming a 4x4 resonant unit combination. The width and height between adjacent resonant units 22 are both a, and the overall arrangement is in an array form.

[0068] Specifically, a single resonant unit 22 and the cork substrate 21 can be equivalent to a spring-oscillator unit. Due to the density difference between the two, a negative equivalent mass density is formed in a certain low-frequency band, creating an elastic wave bandgap to suppress low-frequency noise. In addition, the spacing between the periodically arranged resonant units 22 is 'a', and the noise reduction frequency band can be adjusted by adjusting the spacing 'a' and the size of the resonant unit 22.

[0069] It should be noted that in this invention, the resonant unit 22 is made of recycled metal material with a density greater than that of the substrate 21; the density of cork is 120-220 kg / m³. 3 The resonant unit 22 can be made of a metal material with a higher density than itself, such as iron, steel, etc.

[0070] The resonant unit 22 is inserted into the substrate 21.

[0071] like Figure 5As shown, in order to make the characteristic frequency of the low-frequency noise control layer 2 lower, the resonant unit 22 can be made of any material with a high density. For environmental protection reasons, waste screws, bolts, tacks and other low-cost raw materials can be recycled and directly nailed into the cork base 21 to form a fit. The predetermined acoustic characteristics can be obtained by controlling the geometric dimensions of the resonant unit 22.

[0072] It should be noted here that when the resonant unit 22 is made of screws, such as M5, M6, and M8 screws, the geometric dimensions of the resonant unit 22 include the length, diameter, and pitch of the screws. In other words, screws of different lengths, diameters, and pitches can be selected according to actual needs.

[0073] The base 21 of the sound insulation cotton of the present invention can be made of cork materials with different geometric and physical parameters such as thickness, porosity, density and elastic modulus, thereby achieving broadband noise reduction.

[0074] In this embodiment, the base 21 is circular or square, but of course, any other shape can be used.

[0075] As a further improvement of the present invention, the substrate 21 has a uniform thickness, or the substrate 21 has a variable thickness structure.

[0076] As a further improvement of the present invention, the distance between adjacent resonant units 22 is different.

[0077] The periodically arranged resonant units 22 are directly nailed into the cork substrate 21 for mating; different noise reduction frequency bands can be obtained by designing different distances between the resonant units 22.

[0078] As a further improvement of the present invention, all resonant units 22 may have the same or different specifications.

[0079] When in use, the sound insulation cotton can be wrapped or adhered to the compressor or air conditioner panel using Velcro / glue to achieve noise reduction.

[0080] Example 3:

[0081] In this embodiment, an environmentally friendly sound insulation cotton with excellent low-frequency noise reduction capability and wide bandwidth characteristics is provided, which is simple in structure, easy to process, and low in cost. Figure 1 and Figure 6 As shown, it is a composite double-layer structure, including a low-frequency noise control layer 2 and a mid-to-high-frequency noise control layer 1; the low-frequency noise control layer 2 and the mid-to-high-frequency noise control layer 1 are bonded together with adhesive, wherein:

[0082] The low-frequency noise control layer 2 includes a substrate 21 and a resonant unit 22;

[0083] Specifically, the base 21 is made of cork material and has an internal cavity; in this embodiment, the base 21 uses a type of cork material. However, the processing method of the base 21 differs from that in Embodiment 1. In this embodiment, the base 21 includes a frame 23 and a biaxially stretched cork film material with a certain prestress fixed within the frame 23. In this embodiment, the cork is processed into a film shape, which is easy to stretch and fix. It should be noted that when using stretched cork material, the thickness of the cork film base 21 should be less than 4mm. It can be biaxially stretched to impart prestress (the prestress is adjustable) before being fixed to the frame 23. The introduction of prestress adds a key parameter; specifically, the greater the prestress, the greater the noise reduction and the wider the noise reduction bandwidth. The trade-off is that the introduction of prestress and the frame 23 leads to increased processes and higher costs.

[0084] The resonant units 22 are arranged periodically on the substrate 21;

[0085] The mid-to-high frequency noise control layer 1 is made of environmentally friendly porous fiber sound insulation cotton material. Specifically, the environmentally friendly porous fiber sound insulation cotton material includes felt, that is, the mid-to-high frequency noise control layer 1 can be made of common porous fiber materials such as felt, used to absorb and block mid-to-high frequency sound, and is bonded to the low-frequency noise control layer 2 with adhesive.

[0086] This invention provides a sound insulation cotton, comprising a low-frequency noise control layer 2 for low-frequency noise insulation and a mid-to-high-frequency noise control layer 1 for mid-to-high-frequency noise insulation. It can comprehensively cover noise of different frequencies. A base 21 is made of cork material, with periodically arranged resonant units 22, equivalent to a spring-oscillator unit. Due to the density difference between the two, a negative equivalent mass density is formed in a certain low-frequency band, creating an elastic wave bandgap to suppress low-frequency noise. It has a significant suppression effect on low-frequency noise below 500Hz. Broadband noise reduction can be achieved by adhering ordinary sound insulation cotton material. The base 21 has an internal cavity to form a sound-absorbing cavity, which can suppress noise above 500Hz. The base 21 is made of environmentally friendly recycled cork material, resulting in a simple structure, small overall thickness, easy processing and installation, wide material availability, low cost, green environmental protection, and wide applicability.

[0087] like Figure 4 The figure shown is a top view of an embodiment of the low-frequency noise control layer of the present invention. As can be seen in the figure, four rows of resonant units 22 are arranged on the substrate 21. Each row of resonant units 22 has four units, forming a 4x4 resonant unit 22 combination. The width and height between adjacent resonant units 22 are both a, and the overall arrangement is in an array form.

[0088] Specifically, a single resonant unit 22 and the cork substrate 21 can be equivalent to a spring-oscillator unit. Due to the density difference between the two, a negative equivalent mass density is formed in a certain low-frequency band, creating an elastic wave bandgap to suppress low-frequency noise. In addition, the spacing between the periodically arranged resonant units 22 is 'a', and the noise reduction frequency band can be adjusted by adjusting the spacing 'a' and the size of the resonant unit 22.

[0089] It should be noted that in this invention, the resonant unit 22 is made of recycled metal material with a density greater than that of the substrate 21; the density of cork is 120-220 kg / m³. 3 The resonant unit 22 can be made of a metal material with a higher density than itself, such as iron, steel, etc.

[0090] The resonant unit 22 is inserted into the substrate 21.

[0091] like Figure 5 As shown, in order to make the characteristic frequency of the low-frequency noise control layer 2 lower, the resonant unit 22 can be made of any material with a high density. For environmental protection reasons, waste screws, bolts, tacks and other low-cost raw materials can be recycled and directly nailed into the cork base 21 to form a fit. The predetermined acoustic characteristics can be obtained by controlling the geometric dimensions of the resonant unit 22.

[0092] It should be noted here that when the resonant unit 22 is made of screws, such as M5, M6, and M8 screws, the geometric dimensions of the resonant unit 22 include the length, diameter, and pitch of the screws. In other words, screws of different lengths, diameters, and pitches can be selected according to actual needs.

[0093] In this embodiment, the base 21 is circular or square, but of course, any other shape can be used.

[0094] As a further improvement of the present invention, the substrate 21 has a uniform thickness, or the substrate 21 has a variable thickness structure.

[0095] As a further improvement of the present invention, the distance between adjacent resonant units 22 is different.

[0096] The periodically arranged resonant units 22 are directly nailed into the cork substrate 21 for mating; different noise reduction frequency bands can be obtained by designing different distances between the resonant units 22.

[0097] As a further improvement of the present invention, all resonant units 22 may have the same or different specifications.

[0098] When in use, the sound insulation cotton can be wrapped or adhered to the compressor or air conditioner panel using Velcro / glue to achieve noise reduction.

[0099] It should be noted that, in the above embodiments, the substrate 21 in the sound insulation cotton can be composed of cork materials with different geometric and physical parameters such as thickness, porosity, density, and elastic modulus. The characteristic frequency can also be adjusted by obtaining different prestresses after biaxial stretching and fixing the cork material. Its outer contour can be circular, square, or arbitrary, and its thickness can be uniform or variable cross-section, which can suppress noise in different frequency bands and achieve the effect of broadband vibration reduction and noise reduction. The predetermined acoustic characteristics can be obtained by designing the substrate 21. Different cork materials can be used, or different geometric and physical properties can be obtained by processing the same material with different processes to achieve different characteristics, such as controlling the porosity by calendering.

[0100] Example 4:

[0101] like Figure 1 and Figure 7 As shown, in this embodiment, the only difference from embodiment 1, embodiment 2, or embodiment 3 is that at least one through hole 24 is also provided on the substrate 21.

[0102] like Figure 7 As shown, through holes are also arranged in an array between the resonant units 22.

[0103] To further improve the sound absorption effect, the through hole 24 is filled with damping or sound-absorbing material.

[0104] The cross-sectional shape of the through hole 24 can be any geometry, such as circular, rectangular, or wedge-shaped. Due to the presence of the through hole 24 and the damping / sound-absorbing material, the noise reduction characteristics are altered, but the overall noise reduction performance remains good.

[0105] Example 5:

[0106] In this embodiment, as Figure 8 As shown, the substrate 21 and the resonant unit 22 are arranged in a modular structure. Specifically, the substrate 21 includes several partitions 10, that is, the substrate 21 is divided into n x n regions. Each partition 10 has at least one resonant unit 22 evenly arranged (at adjustable distances). The resonant units 22 in different partitions 10 have different structural dimensions. The number of resonant units 22 in each partition 10 is different. The resonant units 22 in the same partition 10 have the same structural dimensions.

[0107] like Figure 8As shown, this is a schematic diagram of the modular design structure of the low-frequency noise control layer 2. In this diagram, the first group of resonant units 22 is arranged in the upper left partition 10, the second group of resonant units 22 is arranged in the upper right partition 10, and a(2) represents the distance of the distribution of the second group of resonant units 22; the third group of resonant units 22 is arranged in the lower left partition 10, and a(3) represents the distance of the distribution of the third group of resonant units 22; the fourth group of resonant units 22 is arranged in the lower right partition 10, and a(4) represents the distance of the distribution of the fourth group of resonant units 22, and so on, a(n) represents the distance of the distribution of the nth group of resonant units 22.

[0108] The above structural design allows different modules to have different noise reduction frequency bands, and the combination of modules can achieve a wide-band noise reduction effect.

[0109] To better reduce vibration and noise, a refined and modular design can be carried out to address actual noise problems. Specifically, the peak noise frequency of a certain model can be set as the target frequency, and variables such as the thickness of the cork base 21, the geometric dimensions and distribution distance of the resonant unit 22 can be used as optimization parameters. The parameter values ​​can be obtained based on the optimization algorithm to achieve the effect of structural optimization.

[0110] As a further improvement of the present invention, the sound insulation cotton of the present invention is a novel type of sound insulation cotton, which contains periodic metamaterial units that form a negative equivalent mass density at a specific frequency and has a low-frequency elastic wave bandgap. It has a significant suppression effect on low-frequency noise below 500Hz. It can achieve broadband noise reduction by adhering ordinary sound insulation cotton materials. It has a simple structure, small overall thickness, is easy to process and install, has a wide range of material sources, low cost, is green and environmentally friendly, and has wide applicability.

[0111] The present invention provides a compressor, which includes sound insulation cotton.

[0112] The compressor provided by this invention includes a multi-layer composite sound insulation layer, divided into a low-frequency noise (below 500Hz) control layer and a mid-to-high frequency noise (above 500Hz) control layer. The low-frequency noise control layer 2 consists of a cork base 21 and periodically arranged resonant units 22 (such as screws). The cork base 21 contains an internal cavity and possesses a certain sound absorption capacity. At specific low-frequency frequencies, the vibrations of the base 21 and the resonant units 22 respond to excitation in opposite directions, with the equivalent displacement approaching zero, forming a negative equivalent mass density, resulting in good noise suppression. The mid-to-high frequency noise control layer 1 uses common environmentally friendly sound insulation cotton material. The two layers are bonded together with adhesive. By employing this new type of sound insulation cotton, the noise problem in the compressor system application process is solved, addressing the issues of poor low-frequency noise suppression, narrow noise reduction bandwidth, complex manufacturing processes, and high costs associated with existing sound insulation cotton structures.

[0113] The present invention provides an air conditioner including the above-mentioned sound insulation cotton. In use, the sound insulation cotton is directly installed on the air conditioner panel.

[0114] The present invention provides an air conditioner, including the above-mentioned compressor, wherein the compressor contains sound insulation cotton.

[0115] To improve the noise reduction effect of this invention, the structure can be designed and optimized according to the following technical path: 1. Determine the peak value and frequency band of the noise reduction required; 2. Based on the finite element method, establish its acoustic vibration simulation model according to the geometric and material characteristics of the structure of this invention, and screen out key parameters through parameter sensitivity analysis; 3. Optimize using the genetic algorithm NSGA-II (adaptive simulated annealing algorithm, neural network and other optimization algorithms can also be used) to obtain the simplest sound insulation cotton structure under the premise that the obtained noise reduction characteristic frequency band matches the actual noise peak.

[0116] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0117] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0118] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0119] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0120] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0121] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0122] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A sound-insulating cotton, characterized in that, It has a composite two-layer structure, including a low-frequency noise control layer and a mid-to-high-frequency noise control layer; wherein: The low-frequency noise control layer includes a substrate and resonant units; the substrate is made of cork material and has an internal cavity; the resonant units are arranged periodically on the substrate. The mid-to-high frequency noise control layer is made of environmentally friendly porous fiber sound insulation cotton material. The cork substrate and the resonant unit constitute a spring-oscillator unit, and the density of the cork is 120-220 kg / m³. 3 The resonant unit is made of recycled metal material with a density greater than that of the substrate; the resonant unit is inserted into the substrate and generates a negative equivalent mass density effect in the frequency band below 500Hz. The substrate includes several partitions, and at least one resonant unit is uniformly disposed in each partition; the resonant units located in different partitions have different structural dimensions; and the number of resonant units in each partition is different.

2. The sound-insulating cotton according to claim 1, characterized in that, The low-frequency noise control layer and the mid-to-high-frequency noise control layer are bonded together using adhesive.

3. The sound insulation cotton according to claim 1, characterized in that, The substrate comprises at least two cork materials with different geometric and physical parameters; wherein the geometric and physical parameters include thickness, porosity, density, and elastic modulus.

4. The sound-insulating cotton according to claim 1, characterized in that, The substrate includes a frame and a biaxially oriented cork film material with a certain prestress fixed within the frame.

5. The sound-insulating cotton according to claim 3 or 4, characterized in that, The base is circular or square.

6. The sound-insulating cotton according to claim 3 or 4, characterized in that, The substrate has a uniform thickness, or the substrate is a variable thickness structure.

7. The sound insulation cotton according to claim 1, characterized in that, The distances between adjacent resonant units are different.

8. The sound insulation cotton according to claim 1, characterized in that, All of the resonant units may have the same or different specifications.

9. The sound-insulating cotton according to claim 1, characterized in that, The substrate also has at least one through hole.

10. The sound-insulating cotton according to claim 9, characterized in that, The through hole is filled with damping or sound-absorbing material.

11. The sound-insulating cotton according to claim 1, characterized in that, The environmentally friendly porous fiber sound insulation cotton material includes felt.

12. A compressor, characterized in that, Includes the sound-insulating cotton as described in any one of claims 1-11.

13. An air conditioner, characterized in that, It includes the sound insulation cotton as described in any one of claims 1-11; or, it includes the compressor as described in claim 12.

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