Sound insulation cotton, compressor and air conditioner

Abstract

The invention provides sound insulation cotton, a compressor and an air conditioner, relates to the technical field of compressors, and solves the technical problems that a sound insulation cotton structure is poor in low-frequency noise suppression effect, narrow in noise reduction bandwidth, complex in process and high in cost. The sound insulation cotton comprises a low-frequency noise control layer and a medium-high frequency noise control layer. The low-frequency noise control layer comprises a substrate and a resonance unit; the base is made of a cork material; the resonance units are arranged on the substrate in a periodic arrangement mode; and the medium-high frequency noise control layer is made of an environment-friendly porous fiber sound insulation cotton material. The sound insulation cotton contains the periodic metamaterial units, negative equivalent mass density is formed under the specific frequency, a low-frequency elastic wave band gap is achieved, the obvious inhibition effect on low-frequency noise below 500 Hz is achieved, and the broadband noise reduction effect can be achieved by adhering a common sound insulation cotton material; in addition, the device has the advantages of being simple in structure, small in overall thickness, easy to machine and install, wide in material source, low in cost, environmentally friendly and wide in applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a sound insulation cotton, a compressor and an air conditioner. Background Art

[0002] The electromagnetic noise, pneumatic noise and mechanical noise in the compressor are the main noise sources of the air-conditioning system. The above noise is excited from the inside, transmitted to the shell and dispenser in the form of vibration and radiated outward, contributing up to 80% of the system noise energy. Noise can be divided into low-frequency, medium-frequency and high-frequency noise according to the wavelength from long to short. Among them, low-frequency noise cannot be captured efficiently due to its extremely strong penetrating ability. In the application of air-conditioning systems, the existing passive noise reduction methods are mainly to wrap sound insulation cotton around the compressor. Its structure is mainly divided into a single layer of sound-absorbing / sound-insulating material and a composite structure composed of multiple layers of sound-absorbing and sound-insulating materials. Such as Figure 1 As shown, the prior art discloses a sound insulation cotton, which includes three layers of sound absorbing material and sound insulation material layers of different densities sewn together. This sound insulation cotton structure is not only thicker, but also has complex process. Figure 2 As shown, the prior art also discloses a composite board, which is 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 board has a complex structure, a large thickness, and a high cost, which is not conducive to practical application. In addition, the sound insulation cotton in the prior art still has problems in practical applications, such as poor control of medium and low frequency noise, large thickness of the composite structure, complex structure and high cost.

[0003] In addition, combined with the current dual-carbon strategy guidance, improving resource utilization, energy conservation and emission reduction, and reducing costs and increasing efficiency have gradually become a theme in product development. In this context, the use of recycled materials can reduce the waste of raw materials and energy, which is in line with the concept of sustainable development design.

[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 band based on a low-cost, widely available green and environmentally friendly material. Summary of the invention

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

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a sound insulation cotton, which is a composite double-layer structure, including a low-frequency noise control layer and a medium- and high-frequency noise control layer; wherein:

[0008] The low-frequency noise control layer comprises a substrate and a resonance unit; the substrate is made of cork material and has a cavity inside; the resonance unit is arranged on the substrate in a periodic arrangement;

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

[0010] The present invention provides a sound insulation cotton, comprising a low-frequency noise control layer for soundproofing low-frequency noise and a medium-high frequency noise control layer for soundproofing medium-high frequency noise, which can comprehensively cover noises of different frequencies. The base is made of cork material, and the resonance units are arranged periodically, which is equivalent to a spring-oscillator unit. Due to the difference in density between the two, the response directions of the excitation are opposite in a certain low-frequency band to form a negative equivalent mass density, and an elastic wave band gap is formed to suppress low-frequency noise. The low-frequency noise below 500 Hz has an obvious suppressing effect, and the effect of broadband noise reduction can be achieved by adhering ordinary sound insulation cotton material; the base has a cavity inside, which can suppress noise above 500 Hz; the base is made of environmentally friendly recycled cork material, which has a simple structure, a small overall thickness, is easy to process and install, and has a wide source of materials, low cost, green and environmental protection, and wide applicability.

[0011] As a further improvement of the present invention, the low-frequency noise control layer and the medium- and high-frequency noise control layer are compounded together by gluing.

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

[0013] As a further improvement of the present invention, the substrate comprises a frame and a biaxially stretched cork film material with a certain prestress fixed in 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 an overall 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 physical parameters such as thickness, porosity, density and elastic modulus. The characteristic frequency can also be adjusted by obtaining different prestresses by biaxially stretching the cork material and fixing it. Its outer contour can be circular, square or any shape, and the thickness can be uniform and variable cross-section, which can suppress noise in different frequency bands and achieve the effect of wide-band vibration reduction and noise reduction. Predetermined acoustic properties can be obtained by designing the base. Different cork materials can be set, and different processes can be used to process the same material to obtain different geometric physical properties to achieve different properties, such as controlling the porosity through calendering.

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

[0018] In order to make the characteristic frequency of the low-frequency noise control layer lower, the resonance unit can select any material with higher density. For environmental protection reasons, low-cost raw materials such as waste screws and bolts can be recycled; the predetermined acoustic characteristics can be obtained by controlling the geometric dimensions of the resonance unit.

[0019] As a further improvement of the present invention, the distances between adjacent resonance units are different.

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

[0021] As a further improvement of the present invention, the specifications of all the resonance units are the same or different.

[0022] As a further improvement of the present invention, at least one through hole is also 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, each of which is evenly provided with at least one resonance unit; the resonance units in different partitions have different structural sizes; and the number of resonance units in each partition is different.

[0025] In order to better reduce vibration and noise, refined and modular designs can be carried out according to actual noise problems. Specifically, the peak noise frequency of a certain model can be set as the target frequency, and variables such as the cork base thickness, the geometric dimensions of the resonance unit and the distribution distance can be used as optimization parameters. The parameter values ​​can be obtained 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 the present invention is a new type of sound insulation cotton, which contains periodic metamaterial units to form a negative equivalent mass density at a specific frequency, has a low-frequency elastic wave band gap, and has an obvious inhibitory effect on low-frequency noise below 500 Hz. The effect of broadband noise reduction can be achieved by adhering ordinary sound insulation cotton materials; the structure is simple, the overall thickness is small, it is easy to process and install, the material source is wide, the cost is low, it is green and environmentally friendly, and it has a wide range of applicability.

[0028] The present invention provides a compressor, comprising the sound insulation cotton.

[0029] The compressor provided by the present invention includes multiple layers of composite sound insulation cotton, which are divided into a low-frequency noise (below 500Hz) control layer and a medium- and high-frequency noise (above 500Hz) control layer. The low-frequency noise control layer is composed of a cork substrate and periodically arranged resonance units (such as screws). The cork substrate contains an internal cavity and has a certain sound absorption capacity. At a specific low frequency, the vibration response directions of the substrate and the resonance unit to the excitation are opposite, and the equivalent displacement approaches zero, forming a negative equivalent mass density, which has a better noise suppression effect; the medium- and high-frequency noise control layer uses common environmentally friendly sound insulation cotton materials, and the two are composited by gluing. By adopting a new type of sound insulation cotton, the noise problem in the application process of the compressor system is solved, and the problems of poor low-frequency noise suppression effect, narrow noise reduction bandwidth, complex process and high cost of the existing sound insulation cotton structure are solved.

[0030] The present invention provides an air conditioner, including the sound insulation cotton; or, including the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the structure of the sound insulation cotton in the prior art;

[0033] Figure 2 It is a structural schematic diagram of a composite plate in the prior art;

[0034] Figure 3 It is a schematic cross-sectional structure diagram of an embodiment of the sound insulation cotton of the present invention;

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

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

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

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

[0039] Figure 8 It 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, medium and high frequency noise control layer; 2, low frequency noise control layer; 21, substrate; 22, resonance unit; 23, frame; 24, through hole; 10, partition. DETAILED DESCRIPTION

[0041] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0042] Example 1

[0043] like Figure 3 As shown, the present invention provides an environmentally friendly sound insulation cotton with simple structure, easy processing, low cost, excellent low-frequency noise reduction capability and broadband characteristics. It is a composite double-layer structure, including a low-frequency noise (below 500Hz) control layer 2 and a medium and high frequency noise control layer 1; the low-frequency noise control layer 2 and the medium and high frequency noise control layer 1 are composited together by gluing.

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

[0045] Specifically, the base 21 is made of cork material and has a cavity inside; in this embodiment, the base 21 is made of a cork material, which can be specifically recycled wine bottle corks, which are made through sintering, bonding, heating and compression, etc., wherein the porosity, shape (rectangular, cylindrical) and size (length, width, height, diameter, equal thickness, variable cross-section thickness, etc.) can be adjusted according to actual needs. Cork is a plant tissue with the advantages of wear resistance, waterproofness, corrosion resistance, non-toxicity, and biodegradability. More importantly, this material has better sound absorption performance than other natural materials and processed wood. On the other hand, cork is mainly used in the wine industry and the footwear industry. After recycling, it can be made into board and film-type green and environmentally friendly materials through simple processing procedures (sintering, bonding, heating, compression, cooling, etc.), and the cost is low.

[0046] The resonant units 22 are arranged on the substrate 21 in a periodic arrangement;

[0047] The mid-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-high frequency noise control layer 1 can be made of common porous fiber materials such as felt, which is used to absorb and isolate mid-high frequency sounds, and is composited with the low frequency noise control layer 2 by gluing.

[0048] The present invention provides a sound insulation cotton, comprising a low-frequency noise control layer 2 for sound insulation of low-frequency noise and a medium-high frequency noise control layer 1 for sound insulation of medium-high frequency noise, which can comprehensively cover noises of different frequencies. A base 21 is made of cork material, and resonance units 22 are arranged periodically, which are equivalent to spring-oscillator units. Due to the difference in density between the two, a negative equivalent mass density is formed in a certain low-frequency band, and an elastic wave band gap is formed to suppress low-frequency noise. It has an obvious suppressing effect on low-frequency noise below 500 Hz, and a broadband noise reduction effect can be achieved by adhering ordinary sound insulation cotton material; the base 21 has a cavity inside to form a sound-absorbing cavity, which can suppress noise above 500 Hz; the base 21 is made of environmentally friendly recycled cork material, which has a simple structure, a small overall thickness, is easy to process and install, and has a wide source of materials, low cost, green environmental protection, and wide applicability.

[0049] like Figure 4 As shown, it is a top view of an embodiment of the low-frequency noise control layer of the present invention. In this figure, it can be seen that four rows of resonance units 22 are arranged on the substrate 21, and the number of resonance units 22 in each row is four, forming a 4X4 resonance unit 22 combination, and the width between adjacent resonance units 22 is a, and the height is also a, and the whole is arranged in an array form.

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

[0051] It should be noted that, in the present invention, the resonance unit 22 is made of waste recycled metal material with a density greater than that of the base 21; the density of cork is: 120-220 kg / m 3 The resonance unit 22 can be made of a metal material with a density greater than that of the resonance unit 22, such as iron, steel, etc.

[0052] The resonance unit 22 is disposed in 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 resonance unit 22 can select any material with a higher density. For environmental protection reasons, waste screws, bolts, thumbtacks 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 resonance unit 22.

[0054] It should be noted here that when the resonance unit 22 is made of screws, such as M5, M6, and M8 screws, the geometric dimensions of the resonance unit 22 include the length, diameter, pitch, etc. of the screws, that is, 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 it may also be in any other shape.

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

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

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

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

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

[0061] Embodiment 2:

[0062] In this embodiment, if Figure 1 As shown, a simple, easy-to-process, low-cost environmentally friendly sound insulation cotton with excellent low-frequency noise reduction capability and broadband characteristics is provided, which is a composite double-layer structure, including a low-frequency noise control layer 2 and a medium-high frequency noise control layer 1; the low-frequency noise control layer 2 and the medium-high frequency noise control layer 1 are composited together by gluing, wherein:

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

[0064] Specifically, the base 21 is made of cork material and has a cavity inside. In the present embodiment, the base 21 is not made of one cork material, but the base 21 includes at least two cork materials with different geometrical and physical parameters. The geometrical and physical parameters include thickness, porosity, density and elastic modulus.

[0065] The resonant units 22 are arranged on the substrate 21 in a periodic arrangement;

[0066] The mid-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-high frequency noise control layer 1 can be made of common porous fiber materials such as felt, which is used to absorb and isolate mid-high frequency sounds, and is composited with the low frequency noise control layer 2 by gluing.

[0067] In this embodiment, if Figure 4 As shown in the figure, it can be seen that four rows of resonance units 22 are arranged on the substrate 21, and the number of resonance units 22 in each row is four, forming a 4X4 resonance unit 22 combination, the width between adjacent resonance units 22 is a, and the height is also a, and the whole is arranged in an array form.

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

[0069] It should be noted that, in the present invention, the resonance unit 22 is made of waste recycled metal material with a density greater than that of the base 21; the density of cork is: 120-220 kg / m 3 The resonance unit 22 can be made of a metal material with a density greater than that of the resonance unit 22, such as iron, steel, etc.

[0070] The resonance unit 22 is disposed in 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 resonance unit 22 can select any material with a higher density. For environmental protection reasons, waste screws, bolts, thumbtacks 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 resonance unit 22.

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

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

[0074] In this embodiment, the base 21 is circular or square, but it may also be in any other shape.

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

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

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

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

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

[0080] Embodiment 3:

[0081] In this embodiment, a simple structure, easy processing, low-cost environmentally friendly sound insulation cotton with excellent low-frequency noise reduction capability and broadband characteristics is provided. Figure 1 and Figure 6 As shown, it is a composite double-layer structure, including a low-frequency noise control layer 2 and a medium-high frequency noise control layer 1; the low-frequency noise control layer 2 and the medium-high frequency noise control layer 1 are composited together by gluing, wherein:

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

[0083] Specifically, the base 21 is made of cork material and has a cavity inside; in the present embodiment, the base 21 is made of a cork material. However, in the present embodiment, the processing method of the base 21 is different from that in the present embodiment 1. In the present embodiment, the base 21 includes a frame 23 and a biaxially stretched cork film material with a certain prestress fixed in the frame 23. In the present embodiment, the cork is processed into a film shape, which is easy to stretch and fix. It should be noted that when a stretched cork material is used, the thickness of the base 21 made of the cork film should be less than 4 mm. It can be biaxially stretched to impart prestress (the prestress is adjustable) and then fixed on the frame 23. The introduction of prestress adds a key parameter. The specific effect is that the greater the prestress, the greater the noise reduction and the wider the noise reduction band. The cost is that the introduction of prestress and the frame 23 leads to an increase in the number of processes and an increase in costs.

[0084] The resonant units 22 are arranged on the substrate 21 in a periodic arrangement;

[0085] The mid-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-high frequency noise control layer 1 can be made of common porous fiber materials such as felt, which is used to absorb and isolate mid-high frequency sounds, and is composited with the low frequency noise control layer 2 by gluing.

[0086] The present invention provides a sound insulation cotton, comprising a low-frequency noise control layer 2 for sound insulation of low-frequency noise and a medium-high frequency noise control layer 1 for sound insulation of medium-high frequency noise, which can comprehensively cover noises of different frequencies. A base 21 is made of cork material, and resonance units 22 are arranged periodically, which are equivalent to spring-oscillator units. Due to the difference in density between the two, a negative equivalent mass density is formed in a certain low-frequency band, and an elastic wave band gap is formed to suppress low-frequency noise. It has an obvious suppressing effect on low-frequency noise below 500 Hz, and a broadband noise reduction effect can be achieved by adhering ordinary sound insulation cotton material; the base 21 has a cavity inside to form a sound-absorbing cavity, which can suppress noise above 500 Hz; the base 21 is made of environmentally friendly recycled cork material, which has a simple structure, a small overall thickness, is easy to process and install, and has a wide source of materials, low cost, green environmental protection, and wide applicability.

[0087] like Figure 4 As shown, it is a top view of an embodiment of the low-frequency noise control layer of the present invention. In this figure, it can be seen that four rows of resonance units 22 are arranged on the substrate 21, and the number of resonance units 22 in each row is four, forming a 4X4 resonance unit 22 combination, and the width between adjacent resonance units 22 is a, and the height is also a, and the whole is arranged in an array form.

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

[0089] It should be noted that, in the present invention, the resonance unit 22 is made of waste recycled metal material with a density greater than that of the base 21; the density of cork is: 120-220 kg / m 3 The resonance unit 22 can be made of a metal material with a density greater than that of the resonance unit 22, such as iron, steel, etc.

[0090] The resonance unit 22 is disposed in 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 resonance unit 22 can select any material with a higher density. For environmental protection reasons, waste screws, bolts, thumbtacks 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 resonance unit 22.

[0092] It should be noted here that when the resonance unit 22 is made of screws, such as M5, M6, and M8 screws, the geometric dimensions of the resonance unit 22 include the length, diameter, pitch, etc. of the screws, that is, 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 it may also be in any other shape.

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

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

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

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

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

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

[0100] Embodiment 4:

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

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

[0103] In order to further improve the sound absorption effect, the through hole 24 is filled with a damping or sound absorbing material.

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

[0105] Embodiment 5:

[0106] In this embodiment, if Figure 8 As shown, the substrate 21 and the resonant unit 22 are arranged in a modular structure. Specifically, the substrate 21 includes a plurality of partitions 10, that is, the substrate 21 is divided into nxn regions, and at least one resonant unit 22 is evenly arranged (with adjustable distance) in each partition 10; the resonant units 22 in different partitions 10 have different structural dimensions; and 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, it is a schematic diagram of the modular design structure of the low-frequency noise control layer 2. In this figure, the first group of resonance units 22 are arranged in the upper left corner partition 10, and the second group of resonance units 22 are arranged in the upper right corner partition 10, and a(2) represents the distribution distance of the second group of resonance units 22; the third group of resonance units 22 are arranged in the lower left corner partition 10, and a(3) represents the distribution distance of the third group of resonance units 22; the fourth group of resonance units 22 are arranged in the lower right corner partition 10, and a(4) is the distribution distance of the fourth group of resonance units 22, and so on. A(n) represents the distribution distance of the nth group of resonance units 22.

[0108] Through the above structural setting, different modules can have different noise reduction bands, and a broadband noise reduction effect can be achieved through the combination of modules.

[0109] In order to better reduce vibration and noise, a refined and modular design can be carried out according to the actual noise problem; specifically, the noise peak 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 resonance unit 22 can be used as optimization parameters. The parameter values ​​are 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 new type of sound insulation cotton, which contains periodic metamaterial units to form a negative equivalent mass density at a specific frequency, has a low-frequency elastic wave band gap, and has an obvious inhibitory effect on low-frequency noise below 500Hz. The effect of broadband noise reduction can be achieved by adhering ordinary sound insulation cotton materials; it has a simple structure, a small overall thickness, is easy to process and install, has a wide source of materials, is low cost, is green and environmentally friendly, and has a wide range of applicability.

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

[0112] The compressor provided by the present invention includes multiple layers of composite sound insulation cotton, which are divided into a low-frequency noise (below 500Hz) control layer and a medium- and high-frequency noise (above 500Hz) control layer. The low-frequency noise control layer 2 is composed of a cork substrate 21 and periodically arranged resonance units 22 (such as screws). The cork substrate 21 contains an internal cavity and has a certain sound absorption capacity. At a specific low frequency, the vibration response directions of the substrate 21 and the resonance unit 22 to the excitation are opposite, and the equivalent displacement approaches zero, forming a negative equivalent mass density, which has a better noise suppression effect; the medium- and high-frequency noise control layer 1 uses common environmentally friendly sound insulation cotton materials, and the two are composited by gluing. By adopting a new type of sound insulation cotton, the noise problem in the application process of the compressor system is solved, and the problems of poor low-frequency noise suppression effect, narrow noise reduction bandwidth, complex process and high cost of the existing sound insulation cotton structure are solved.

[0113] The present invention provides an air conditioner, comprising the above-mentioned sound insulation cotton, which is directly installed on the air conditioner panel when in use;

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

[0115] In order to improve the noise reduction effect of the present invention, the structure design and optimization can be carried out according to the following technical paths: 1. Determine the peak value and frequency band of the required noise reduction; 2. Based on the finite element method, according to the geometric and material characteristics of the structure of the present invention, establish its acoustic vibration simulation model, and screen out key parameters through parameter sensitivity analysis; 3. Use genetic algorithm NSGA-Ⅱ (adaptive simulated annealing algorithm, neural network and other optimization algorithms can also be used) for optimization, so that the obtained noise reduction characteristic frequency band is consistent with the actual noise peak, and the sound insulation cotton structure is the simplest.

[0116] First of all, it should be explained here that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0117] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0118] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0119] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0120] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0121] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0122] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A sound insulation cotton, It is characterized in that It is a composite double-layer structure, including a low-frequency noise control layer and a medium- and high-frequency noise control layer; wherein: The low-frequency noise control layer comprises a substrate and a resonance unit; the substrate is made of cork material and has a cavity inside; the resonance unit is arranged on the substrate in a periodic arrangement; The medium and high frequency noise control layer is made of environmentally friendly porous fiber sound insulation cotton material.

2. The sound insulation cotton according to claim 1, It is characterized in that The low-frequency noise control layer and the medium- and high-frequency noise control layer are compounded together by gluing.

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

4. The sound insulation cotton according to claim 1, It is characterized in that The substrate comprises a frame and a biaxially stretched cork film material with a certain prestress fixed in the frame.

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

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

7. The sound insulation cotton according to claim 1, It is characterized in that The resonance unit is made of a waste recycled metal material with a density greater than that of the base; and the resonance unit is penetrated into the base.

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

9. The sound insulation cotton according to claim 1, It is characterized in that The specifications of all the resonance units are the same or different.

10. The sound insulation cotton according to claim 1, It is characterized in that The substrate is also provided with at least one through hole.

11. The sound insulation cotton according to claim 10, It is characterized in that The through hole is filled with damping or sound absorbing material.

12. The sound insulation cotton according to claim 1, It is characterized in that The substrate comprises a plurality of partitions, each of which is evenly provided with at least one resonance unit; the resonance units in different partitions have different structural sizes; and the number of the resonance units in each partition is different.

13. The sound insulation cotton according to claim 1, It is characterized in that The environmentally friendly porous fiber sound insulation cotton material includes felt.

14. A compressor, It is characterized in that It comprises the sound insulation cotton as described in any one of claims 1-13.

15. An air conditioner, It is characterized in that It comprises the sound insulation cotton as described in any one of claims 1-13; or, it comprises the compressor as described in claim 14.

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