Silencing cotton assembly, compressor and air conditioner outdoor unit

Abstract

The application discloses a sound-absorbing cotton assembly, a compressor and an outdoor unit of an air conditioner. The sound-absorbing cotton assembly comprises a sound-absorbing cotton body and acoustic superstructures. The acoustic superstructures are embedded in the sound-absorbing cotton body and are distributed in a plurality of and spaced apart. The acoustic superstructure comprises a support and two resonance units. In the thickness direction of the sound-absorbing cotton body, the two resonance units are respectively arranged at two ends of the support and define a cavity between the support and the two resonance units. Each resonance unit comprises a diaphragm and a mass block arranged on the diaphragm. According to the sound-absorbing cotton assembly, the low, medium and high frequency wide band noise radiated by the compressor body can be well reduced through the combination of the acoustic superstructure and the sound-absorbing cotton body.

Description

Technical Field

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

[0002] The outdoor unit of an air conditioner contains a compressor. To reduce the radiated noise from the compressor itself, the compressor body is covered with sound-absorbing cotton. This sound-absorbing cotton has a significant sound absorption and insulation effect on mid-to-high frequency noise. However, its sound absorption and insulation effect on low-frequency and mid-to-low frequency noise is relatively poor. Low-frequency noise can easily penetrate walls and be transmitted into the indoor space, thus posing a significant health hazard. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a sound-absorbing cotton assembly, which can effectively reduce the low, medium and high frequency broadband noise radiated by the compressor body.

[0004] The present invention also proposes a compressor having the above-mentioned sound-absorbing cotton assembly.

[0005] The present invention also proposes an outdoor unit for an air conditioner having the above-mentioned compressor.

[0006] According to a first aspect of the present invention, a sound-absorbing cotton assembly includes: a sound-absorbing cotton body; an acoustic superstructure embedded in the sound-absorbing cotton body, wherein the acoustic superstructure is multiple and spaced apart, the acoustic superstructure includes a support member and two resonant units, wherein in the thickness direction of the sound-absorbing cotton body, the two resonant units are respectively disposed at both ends of the support member and define a cavity between them, and each resonant unit includes a thin film and a mass block disposed on the thin film.

[0007] According to the embodiments of the present invention, the sound-absorbing cotton assembly can effectively reduce the low, medium and high frequency broadband noise radiated by the compressor body through the combination of acoustic superstructure and sound-absorbing cotton body.

[0008] In some embodiments, the difference in resonant frequencies between two resonant units of at least one of the acoustic metastructures is greater than or equal to 50 Hz.

[0009] In some embodiments, the sum of the number of the resonant units with resonant frequencies of 20Hz to 1200Hz is greater than or equal to 80% of the total number of all the resonant units.

[0010] In some embodiments, all of the acoustic superstructures are arranged in the same layer relative to the sound-absorbing cotton body.

[0011] In some embodiments, the total area of ​​the acoustic superstructure relative to the sound-absorbing cotton body is 30% to 40%.

[0012] In some embodiments, the sound-absorbing cotton body includes a first structural layer and a second structural layer stacked together, all of the acoustic superstructures are embedded in the first structural layer, and the second structural layer is stacked on one side of the thickness of the first structural layer, or the second structural layer is stacked on both sides of the thickness of the first structural layer.

[0013] In some embodiments, the thickness of the first structural layer is less than the thickness of the second structural layer, the first structural layer includes at least one layer selected from PVC and rubber, and the second structural layer includes at least one layer selected from needle-punched felt, polyurethane cotton, PU foam, and glass wool.

[0014] In some embodiments, the sound-absorbing cotton body has a plurality of spaced-apart receiving grooves, and each receiving groove is provided with an acoustic superstructure. In the thickness direction of the sound-absorbing cotton body, the height H of the acoustic superstructure is 80%-120% of the groove depth L of the receiving groove.

[0015] In some embodiments, the thickness t of the film is less than or equal to 1 / 3 of the depth L of the receiving groove.

[0016] In some embodiments, the resonant unit satisfies at least one of the following three conditions: Condition 1, the thickness t of the thin film is 0.1 mm < t ≤ 0.5 mm; Condition 2, the mass of the mass block is 0.001 g to 0.002 g; Condition 3, the elastic modulus of the thin film is 15 MPa to 25 MPa.

[0017] A compressor according to a second aspect of the present invention includes a compressor body and a sound-absorbing cotton assembly according to a first aspect of the present invention, the sound-absorbing cotton assembly covering the outer surface of the compressor body.

[0018] According to the compressor of the present invention, by providing the sound-absorbing cotton assembly of the first aspect embodiment described above, the low, medium and high frequency broadband noise radiated by the compressor body is effectively reduced.

[0019] An outdoor unit of an air conditioner according to a third aspect of the present invention includes an outdoor heat exchanger and a compressor according to a second aspect of the present invention, wherein the outdoor heat exchanger is connected to the compressor body.

[0020] According to the present invention, by providing the compressor of the first aspect embodiment described above, the low-noise performance of the outdoor unit of the air conditioner is improved.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of a sound-absorbing cotton assembly according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A partial enlarged view of part A shown in the image;

[0024] Figure 3 This is a cross-sectional view of an acoustic superstructure according to an embodiment of the present invention;

[0025] Figure 4 This is a front view of a sound-absorbing cotton assembly according to an embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional view of the sound-absorbing cotton assembly according to Embodiment 1 of the present invention;

[0027] Figure 6 This is a cross-sectional view of the sound-absorbing cotton assembly according to Embodiment 2 of the present invention;

[0028] Figure 7 It is a comparison curve of the first ten resonant frequencies of a resonant unit containing mass blocks of different masses.

[0029] Figure 8 It is a comparison curve of the first ten resonant frequencies of resonant units containing thin films of different thicknesses.

[0030] Figure 9 It is a comparison curve of the first ten resonant frequencies of resonant units containing thin films of different materials.

[0031] Figure label:

[0032] 100 units of sound-absorbing cotton components;

[0033] 1. Sound-absorbing cotton body; 10. Receiving groove; 11. First structural layer; 12. Second structural layer;

[0034] Acoustic superstructure 2; cavity 20; support 21; resonant unit 22; thin film 221; mass block 222. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0037] Hereinafter, with reference to the accompanying drawings, a sound-absorbing cotton assembly 100 according to a first aspect of the present invention will be described.

[0038] like Figure 1 and Figure 2 As shown, the sound-absorbing cotton assembly 100 may include: a sound-absorbing cotton body 1 and acoustic superstructures 2. The acoustic superstructures 2 are embedded in the sound-absorbing cotton body 1, and there are multiple acoustic superstructures 2 distributed at intervals. It is worth noting that the arrangement of the multiple acoustic superstructures 2 is not limited. For example, the multiple acoustic superstructures 2 can be spaced apart on the same thickness layer of the sound-absorbing cotton body 1, or they can be spaced apart on different thickness layers of the sound-absorbing cotton body 1. For example, the sound-absorbing cotton body 1 can be a multi-layered structure, and all acoustic superstructures 2 can be embedded in the same structural layer, or they can be embedded in different structural layers. Figure 5 and Figure 6 As shown, the sound-absorbing cotton body 1 may include a first structural layer 11 and a second structural layer 12 stacked together. All acoustic superstructures 2 may be embedded in the first structural layer 11 at intervals, or a portion of the acoustic superstructures 2 may be embedded in the first structural layer 11 at intervals, and the remaining acoustic superstructures 2 may be embedded in the second structural layer 12 at intervals (this example is not shown in the figure), etc., which will not be exemplified here.

[0039] Combination Figure 2 and Figure 3 The acoustic superstructure 2 includes a support member 21 and two resonant units 22. Along the thickness direction of the sound-absorbing cotton body 1, the two resonant units 22 are respectively located at both ends of the support member 21. For example, the two sides of the thickness of the sound-absorbing cotton body 1 are the first surface and the second surface, respectively. A resonant unit 22 is provided on the side of the support member 21 near the first surface, and another resonant unit 22 is provided on the side of the support member 21 near the second surface. Figures 1-3In the specific example shown, the thickness direction of the sound-absorbing cotton body 1 is vertical, with the upper and lower surfaces on both sides of the thickness, respectively. The upper side of the support member 21 is close to the upper surface of the sound-absorbing cotton body 1, and therefore a resonant unit 22 is provided on the upper side of the support member 21. The lower side of the support member 21 is close to the lower surface of the sound-absorbing cotton body 1, and therefore a resonant unit 22 is also provided on the lower side of the support member 21. It is worth noting that the two resonant units 22 of the same acoustic superstructure 2 can be the same or different, and can be adjusted according to actual requirements.

[0040] Combination Figure 3 A cavity 20 is defined between the two resonant units 22 and the support member 21. Each resonant unit 22 includes a thin film 221 and a mass block 222 disposed on the thin film 221. It should be noted that the relative position of the mass block 222 and the thin film 221 in each resonant unit 22 is not limited. For example, the mass block 222 can be disposed on the side of the thin film 221 facing the cavity 20, or on the side of the thin film 221 facing away from the cavity 20, or even embedded inside the thin film 221. Furthermore, the number of mass blocks 222 in each resonant unit 22 is not limited; there can be one or more. When there are multiple mass blocks 222, they can be disposed on the same side or both sides of the thin film 221, etc. In addition, the relative position of the mass block 222 to the center of the film 221 can be set according to different specific parameters such as shape, weight, and quantity. For example, the mass block 222 can be set at the center of the film 221, or the mass block 222 can be set away from the center of the film 221.

[0041] Therefore, the resonant unit 22, composed of the thin film 221 and the mass block 222, can form a mass block-spring resonant system. Thus, the acoustic superstructure 2 can be constructed from the support member 21 and the resonant units 22 at both ends into a subwavelength micro-acoustic superstructure. This subwavelength micro-acoustic superstructure absorbs low-frequency or mid-to-low-frequency noise radiated from the compressor body through the resonant bandgap of the localized resonant microstructure. Furthermore, the sound-absorbing cotton body 1 can reduce the mid-to-high-frequency noise radiated from the compressor body. Therefore, according to the embodiment of the present invention, the sound-absorbing cotton assembly 100, through the combination of the acoustic superstructure 2 and the sound-absorbing cotton body 1, can effectively reduce the low-to-mid-high-frequency broadband noise radiated from the compressor body.

[0042] In related technologies, the sound-absorbing cotton used in the compressor body of the outdoor unit of an air conditioner typically consists of a 1.5mm thick PVC (polyvinyl chloride) layer and a 5mm thick needle-punched felt layer, or a 1.5mm thick PVC layer with 5mm thick needle-punched felt on each side. This type of sound-absorbing cotton has a significant sound absorption and insulation effect on mid-to-high frequency noise (1000Hz~16000Hz). However, it is less effective at absorbing and insulating low-frequency and mid-to-low-frequency noise. Low-frequency noise can easily penetrate walls and enter the indoor space, posing a significant health hazard. Furthermore, in the outdoor units of air conditioners in these technologies, low-frequency noise is mainly concentrated at frequencies of 250Hz, 500Hz, 800Hz, 1000Hz, and 1250Hz, with a significant peak between 200Hz and 1000Hz, resulting in even more severe noise pollution.

[0043] According to the embodiments of the present invention, the sound-absorbing cotton assembly 100 embeds multiple acoustic superstructures 2 within the sound-absorbing cotton body 1. By combining the acoustic superstructures 2 and the sound-absorbing cotton body 1, the sound-absorbing cotton body 1 reduces the mid-to-high frequency noise radiated by the compressor body, while the acoustic superstructures 2 reduce the low-to-mid frequency noise radiated by the compressor body. This effectively reduces the low-to-mid frequency broadband noise radiated by the compressor body, thus more comprehensively reducing noise pollution and minimizing harm to the human body.

[0044] In some embodiments of the present invention, at least one acoustic superstructure 2 is a defined structure, wherein the difference in resonant frequencies of the two resonant units 22 of the defined structure is greater than or equal to 50 Hz. That is, when the difference in resonant frequencies of the two resonant units 22 of an acoustic superstructure 2 is greater than or equal to 50 Hz, the acoustic superstructure 2 is a defined structure, and at least one of all acoustic superstructures 2 is a defined structure. Or, simply put, in all acoustic superstructures 2, at least one acoustic superstructure 2 has a difference in resonant frequencies of the two resonant units 22 greater than or equal to 50 Hz. For example, in... Figure 3 The acoustic superstructure 2 shown is a set structure in which the difference between the resonant frequency of the upper resonant unit 22 and the lower resonant unit 22 is greater than or equal to 50Hz, or the difference between the resonant frequency of the lower resonant unit 22 and the upper resonant unit 22 is greater than or equal to 50Hz.

[0045] Therefore, since the resonant frequencies of the two resonant units 22 in the set structure have a certain difference, low-frequency noise can be controlled more effectively. For example, the difference in resonant frequencies of the two resonant units 22 in the set structure can optionally be 50Hz, 100Hz, 200Hz, 300Hz, 400Hz, 500Hz, 600Hz, 700Hz, 800Hz, 1000Hz, 1100Hz, 1200Hz, etc., without further limitation or elaboration. Furthermore, it is worth noting that the resonant frequency of the resonant unit 22 can be changed by adjusting the relevant parameters of the mass block 222 and the thin film 221, so that the difference in resonant frequencies of the two resonant units 22 in the set structure is greater than or equal to 50Hz, without further elaboration.

[0046] In some embodiments of the present invention, combined with Figure 4 The sum of the number of resonant units 22 with resonant frequencies ranging from 20Hz to 1200Hz is greater than or equal to 80% of the total number of resonant units 22. In other words, 80% or more (including 80%) of the resonant units 22 satisfy the resonant frequency range of 20Hz to 1200Hz. This allows for more effective control of low- and mid-frequency noise. For example, when the number of acoustic superstructures 2 is N, then the total number of resonant units 22 is 2N. Among these 2N resonant units 22, the proportion M of resonant units 22 with resonant frequencies ranging from 20Hz to 1200Hz is not less than 80%, i.e., M / 2N is greater than or equal to 80%.

[0047] In some embodiments of the present invention, combined with Figures 4-6 All acoustic superstructures 2 are arranged in the same layer relative to the sound-absorbing cotton body 1. That is to say, multiple acoustic superstructures 2 can be spaced apart on the same thickness layer of the sound-absorbing cotton body 1. For example, when the sound-absorbing cotton body 1 includes at least the first structural layer 11, all acoustic superstructures 2 can be embedded in the first structural layer 11 at intervals. Thus, by arranging all acoustic superstructures 2 in the same layer, the production difficulty can be reduced and the production efficiency can be improved.

[0048] When all acoustic superstructures 2 are arranged in the same layer relative to the sound-absorbing cotton body 1, further, combined with Figure 4The area ratio of all acoustic superstructures 2 relative to the sound-absorbing cotton body 1 is 30% to 40%. In other words, all acoustic superstructures 2 are arranged in the same layer as the sound-absorbing cotton body 1 and their area ratio is 30% to 40%, for example, 30%, 32%, 34%, 36%, 38%, 40%, etc. Using the cross-section of the first structural layer 11 as the projection plane, or in other words, using the plane perpendicular to the thickness direction of the first structural layer 11 as the projection plane, the ratio of the sum of the orthogonal projected areas of all acoustic superstructures 2 on the projection plane to the orthogonal projected area of ​​the sound-absorbing cotton body 1 on the projection plane is 30% to 40%. Here, "the orthogonal projected area of ​​the sound-absorbing cotton body 1 on the projection plane" refers to the area enclosed by the outer contour line of the sound-absorbing cotton body 1. For example, if the outer contour line of the sound-absorbing cotton body 1 is rectangular, then the orthogonal projected area of ​​the sound-absorbing body refers to the area of ​​the rectangle, not the area difference between the rectangular area and the orthogonal projected area of ​​all acoustic superstructures 2.

[0049] Therefore, by embedding the acoustic superstructure 2, which is set in the same layer, into the sound-absorbing cotton body 1 with an area ratio of 30% to 40%, the problem of insufficient absorption of low-frequency noise due to the small area ratio is effectively improved, as well as the problem of poor sound insulation effect of the sound-absorbing cotton body 1 against high-frequency noise due to the large area ratio is improved. In addition, the local resonant band gap of the acoustic superstructure 2 can be used to absorb the low-frequency noise radiated by the compressor body, improve the overall low-to-mid-frequency noise reduction capability of the sound-absorbing cotton component 100, and at the same time ensure the sound insulation effect of the sound-absorbing cotton component 100 against mid-to-high-frequency noise.

[0050] Furthermore, in some embodiments of the present invention, when all acoustic superstructures 2 are arranged in the same layer relative to the sound-absorbing cotton body 1 and the area ratio is 30% to 40%, and the sum of the number of resonant units 22 with resonant frequencies of 20Hz to 1200Hz is greater than or equal to 80% of the total number of all resonant units 22, low, medium and high frequency noise can be controlled more effectively.

[0051] It is worth noting that the specific composition and material of the sound-absorbing cotton body 1 are not limited; for example, ordinary sound-absorbing cotton in related technologies can be used.

[0052] For example, combining Figure 5 and Figure 6 In some embodiments of the present invention, the sound-absorbing cotton body 1 may include a stacked first structural layer 11 and a second structural layer 12, all acoustic superstructures 2 are embedded in the first structural layer 11, and the second structural layer 12 is stacked on the thickness side of the first structural layer 11 (e.g., Figure 5 (as shown), or, the second structural layer 12 is stacked on both sides of the thickness of the first structural layer 11 (e.g., as shown). Figure 6 (As shown). Therefore, the structure is relatively simple, easy to manufacture, and has a low cost, and it also has a good noise reduction effect for low, medium, and high frequency noise. It is worth noting that... Figure 5 and Figure 6 In the middle, each containing tank 10 should have an acoustic superstructure 2 installed, but... Figure 5 and Figure 6 Hidden within is an acoustic superstructure 2.

[0053] Optionally, the thickness of the first structural layer 11 is less than the thickness of the second structural layer 12. The first structural layer 11 includes at least one layer selected from PVC and rubber (i.e., the first structural layer 11 can be a single layer or a composite layer), and the second structural layer 12 includes at least one layer selected from needle-punched felt, polyurethane cotton, PU (i.e., polyurethane) foam, and glass wool (i.e., the second structural layer 12 can be a single layer or a composite layer). This effectively reduces the overall thickness of the sound-absorbing cotton assembly 100, and the sound-absorbing cotton body 1 provides better sound absorption for mid-to-high frequencies, while the first structural layer 11 provides better containment for the acoustic superstructure 2.

[0054] For example, in some specific examples, the first structural layer 11 is a PVC layer, the second structural layer 12 is a needle-punched felt layer, the thickness of the first structural layer 11 is less than the thickness of the second structural layer 12, all acoustic metastructures 2 are embedded in the first structural layer 11, and the second structural layer 12 is stacked on the side of the thickness of the first structural layer 11 (e.g., Figure 5 (as shown), or, the second structural layer 12 is stacked on both sides of the thickness of the first structural layer 11 (e.g., as shown). Figure 6 (As shown). Therefore, the structure is relatively simple, easy to process, and has a low cost. Moreover, it has a good noise reduction effect for low, medium and high frequency noise, and the first structural layer 11 has a good limiting effect on the acoustic superstructure 2.

[0055] In some embodiments of the present invention, such as Figures 4-6 As shown, the sound-absorbing cotton body 1 has multiple spaced-apart receiving slots 10, meaning that the sound-absorbing cotton body 1 has multiple receiving slots 10 spaced apart. Each receiving slot 10 contains an acoustic superstructure 2, thus illustrating that the multiple acoustic superstructures 2 are correspondingly positioned within the multiple receiving slots 10. Combined with... Figure 2 and Figure 3 In the thickness direction of the sound-absorbing cotton body 1, the height H of the acoustic superstructure 2 is 80%-120% of the groove depth L of the receiving groove 10. For example, the depth direction of the receiving groove 10 is the same as the thickness direction of the sound-absorbing cotton body 1, and the height H of the acoustic superstructure 2 can be 80%, 85%, 90%, 95%, 100%, 105%, 110%, 115%, 120% of the groove depth L of the receiving groove 10, etc.

[0056] Therefore, the height H of the acoustic superstructure 2 is relatively close to the depth L of the receiving groove 10. On the one hand, the receiving groove 10 can play a certain limiting role for the acoustic superstructure 2, improving the installation and operational reliability of the acoustic superstructure 2. On the other hand, it can avoid the waste caused by the receiving groove 10 being too deep relative to the acoustic superstructure 2, which would affect the blocking effect of the sound-absorbing cotton body 1 on high-frequency noise. Therefore, it can better balance the comprehensive noise reduction effect for low, mid and high frequency noise.

[0057] Furthermore, the shape of the support member 21 matches the shape of the peripheral wall of the receiving groove 10, which can be an interference fit or a clearance fit. When it is a clearance fit, an intermediate medium, such as colloid or other medium, can be used to fill it, so as to further improve the installation reliability and operational reliability of the acoustic superstructure 2. In addition, it should be noted that the support member 21 is a hollow column, and its axial direction is the thickness direction of the sound-absorbing cotton body 1, but the cross-sectional shape of the support member 21 is not limited, for example, it can be cylindrical, prismatic, etc.

[0058] It is worth noting that the receiving groove 10 can be a groove closed at both ends, a groove open at one end, or a groove open at both ends. Whether the ends of the receiving groove 10 are open can be determined based on the relationship between the depth of the receiving groove 10 and the thickness of the sound-absorbing cotton body 1, as well as the relative positional relationship between the receiving groove 10 and the sound-absorbing cotton body 1. For example, when the depth of the receiving groove 10 is equal to the thickness of the sound-absorbing cotton body 1, the receiving groove 10 can be formed as a double-ended open groove (this example is not shown in the figure). As another example, when the depth of the receiving groove 10 is less than the thickness of the sound-absorbing cotton body 1, if the receiving groove 10 penetrates the surface of the thickness side of the sound-absorbing cotton body 1, then the receiving groove 10 is a single-ended open groove (e.g., ...). Figure 5 (as shown in the example), and if the receiving groove 10 does not penetrate either side of the thickness of the sound-absorbing cotton body 1, then the receiving groove 10 is a two-end closed groove (as shown in the example). Figure 6 (Example shown).

[0059] Optionally, combined Figure 2 and Figure 3 When the height H of the acoustic superstructure 2 is 80%-120% of the depth L of the receiving groove 10, the thickness t of the diaphragm 221 can be less than or equal to 1 / 3 of the depth L of the receiving groove 10. For example, the thickness t of the diaphragm 221 can be 1 / 3, 1 / 5, 1 / 10, 1 / 15, 1 / 20, 1 / 25, 1 / 30, 1 / 35, 1 / 40, etc., of the depth L of the receiving groove 10. Therefore, the diaphragm 221 has good vibration performance and can have a relatively significant low-frequency noise reduction frequency.

[0060] In some embodiments of the present invention, the resonant unit 22 satisfies at least one of the following three conditions: Condition 1, the thickness t of the thin film 221 is 0.1 mm < t ≤ 0.5 mm; Condition 2, the mass of the mass block 222 is 0.001 g to 0.002 g; Condition 3, the elastic modulus of the thin film 221 is 15 MPa to 25 MPa.

[0061] In some embodiments of the present invention, such as Figure 3 As shown, the mass of mass block 222 can be 0.001g to 0.002g. For example, 0.001g, 0.0012g, 0.0014g, 0.0016g, 0.0018g, 0.002g, etc. The applicant discovered that when the material and thickness t of the thin film 221 are fixed, the resonant frequency of the resonant unit 22 can be changed by adjusting the mass of mass block 222, thereby better improving the absorption of low-frequency noise. For example, combined with... Figure 7 Taking the mass of mass block 222 as a single variable, when the thickness t of film 221 is 0.5 mm and the elastic modulus of film 221 is 0.2 MPa, as the mass of mass block 222 decreases, the resonant frequency of resonant unit 22 increases significantly. When the mass of mass block 222 is controlled between 0.001 g and 0.002 g, the resonant frequency can cover the main low-frequency noise range of the outdoor unit of the air conditioner.

[0062] In some embodiments of the present invention, such as Figure 3 As shown, the thickness t of the thin film 221 can be 0.1 mm < t ≤ 0.5 mm. For example, 0.11 mm, 0.18 mm, 0.25 mm, 0.30 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc. For example, combined with... Figure 8 Using the thickness t of the thin film 221 as a single variable, when the thickness t of the thin film 221 is greater than 0.5 mm, the resonant frequency of the resonant unit 22 remains basically consistent as the thickness t of the thin film 221 increases. By adjusting the thickness t of the thin film 221 between 0.1 mm < t ≤ 0.5 mm, the resonant frequency of the resonant unit 22 is finely adjusted, thereby better matching the required low-frequency noise reduction frequency.

[0063] In some embodiments of the present invention, such as Figure 3 As shown, the elastic modulus of the film 221 is from 15 MPa to 25 MPa. For example, 15 MPa, 16 MPa, 17 MPa, 18 MPa, 19 MPa, 20 MPa, 21 MPa, 22 MPa, 23 MPa, 24 MPa, 25 MPa, etc. For example, combined with... Figure 9Taking the elastic modulus of the film 221 as a single variable, as the elastic modulus of the film 221 increases, the resonant frequency of the resonant unit 22 increases significantly. When the elastic modulus is between 15MPa and 25MPa, the resonant frequency of the resonant unit 22 can cover the main low-frequency noise range of the outdoor unit of the air conditioner. Therefore, the resonant frequency of the resonant unit 22 can be changed by selecting films 221 of different materials, thereby improving the absorption effect of low-frequency noise.

[0064] In summary, for the resonant unit 22, the thickness t and material of the thin film 221, the weight and shape of the mass block 222, the fixed position of the mass block 222 on the thin film 221, etc., can all be adjusted as needed. By adjusting parameters such as the mass of the mass block 222, the thickness t of the thin film 221, and the elastic modulus of the thin film 221, the local resonant bandgap range of the acoustic superstructure 2 can be changed relatively effectively to match the low-frequency noise bandgap to be reduced, thereby satisfying the frequency band range to be reduced and improving the absorption effect of low-frequency noise.

[0065] Hereinafter, a compressor according to a second aspect embodiment of the present invention will be described with reference to the accompanying drawings.

[0066] Specifically, the compressor may include: a compressor body and a sound-absorbing cotton assembly 100 according to the first aspect of the present invention, the sound-absorbing cotton assembly 100 covering the outer surface of the compressor body.

[0067] Therefore, by setting the sound-absorbing cotton assembly 100 according to the embodiment of the present invention, the combination of the acoustic superstructure 2 and the sound-absorbing cotton body 1 can reduce the mid-to-high frequency noise radiated by the compressor body by using the sound-absorbing cotton body 1 on the one hand, and reduce the low-to-mid frequency noise radiated by the compressor body by using the acoustic superstructure 2 on the other hand. This can effectively reduce the low-to-mid-high frequency broadband noise radiated by the compressor body, and more comprehensively reduce noise pollution and reduce harm to the human body.

[0068] Furthermore, it is worth noting that the specific type of compressor is not limited, and can be a rotary compressor, an oscillating compressor, etc., which will not be elaborated here. Additionally, it should be noted that the sound-absorbing cotton assembly 100 according to the first aspect embodiment of the present invention is not limited to noise reduction of compressors; for example, it can also be used in other situations where low, medium, and high frequency broadband noise needs to be eliminated, which will not be limited or elaborated here.

[0069] Furthermore, other components of the compressor according to embodiments of the present invention, such as the drive mechanism and the pump body mechanism, are known to those skilled in the art and will not be described in detail here.

[0070] Hereinafter, with reference to the accompanying drawings, an outdoor unit of an air conditioner according to a third aspect of the present invention will be described.

[0071] Specifically, the outdoor unit of the air conditioner may include: an outdoor heat exchanger and a compressor according to the second aspect of the present invention, wherein the outdoor heat exchanger is connected to the compressor body, i.e., the refrigerant is connected.

[0072] The sound-absorbing cotton used in the compressor body of the outdoor unit of an air conditioner in related technologies is generally composed of a 1.5mm thick PVC material skin and a 5mm thick needle-punched felt layer, or a 1.5mm thick PVC material skin and 5mm thick needle-punched felt on each side. This type of sound-absorbing cotton has a significant sound absorption and insulation effect on mid-to-high frequency noise (1000Hz~16000Hz). However, it has poor sound absorption and insulation effect on low-frequency and mid-to-low frequency noise. Low-frequency noise can easily penetrate walls and enter the indoor space, thus posing a significant health hazard. Furthermore, in the outdoor units of air conditioners in related technologies, low-frequency noise is mainly concentrated at frequencies such as 250Hz, 500Hz, 800Hz, 1000Hz, and 1250Hz, with a significant peak between 200Hz and 1000Hz, resulting in even more severe noise pollution.

[0073] According to an embodiment of the present invention, the outdoor unit of the air conditioner is equipped with a compressor body covered with a sound-absorbing cotton assembly 100 according to the first aspect of the present invention. By embedding multiple acoustic superstructures 2 in the sound-absorbing cotton body 1, the combination of the acoustic superstructures 2 and the sound-absorbing cotton body 1 can reduce the mid-to-high frequency noise radiated by the compressor body on the one hand, and reduce the low-to-mid frequency noise radiated by the compressor body on the other hand. This can effectively reduce the low-to-mid frequency broadband noise radiated by the compressor body, more comprehensively reduce noise pollution, and reduce harm to the human body.

[0074] Additionally, it should be noted that the compressor according to the second aspect of the present invention is not limited to noise reduction of the outdoor unit of an air conditioner. For example, it can also be used in integrated air conditioners or other occasions where a compressor is required and low, medium and high frequency broadband noise needs to be eliminated. No further limitations or descriptions are made here.

[0075] Furthermore, other components of the outdoor unit of the air conditioner according to embodiments of the present invention, such as the outdoor fan and the electrical control box, are known to those skilled in the art and will not be described in detail here.

[0076] In the description of this invention, it should be understood that the terms "depth," "height," "thickness," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, 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 a limitation of this invention.

[0077] 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 one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0078] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In this invention, unless otherwise explicitly specified and limited, "on" or "below" a 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 through an intermediate medium.

[0079] 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.

[0080] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A sound absorbing cotton assembly, characterized by, include: The sound-absorbing cotton body; An acoustic superstructure is embedded in the sound-absorbing cotton body. The acoustic superstructure is multiple and spaced apart. The acoustic superstructure includes a support member and two resonant units. In the thickness direction of the sound-absorbing cotton body, the two resonant units are respectively located at both ends of the support member and define a cavity between them. Each resonant unit includes a thin film and a mass block disposed on the thin film. All of the aforementioned acoustic superstructures are arranged in the same layer relative to the sound-absorbing cotton body; The sound-absorbing cotton body includes a first structural layer and a second structural layer stacked together. All the acoustic superstructures are embedded in the first structural layer. The second structural layer is stacked on one side of the thickness of the first structural layer, or the second structural layer is stacked on both sides of the thickness of the first structural layer. The sound-absorbing cotton body has a plurality of spaced-apart receiving grooves, and each receiving groove is provided with an acoustic superstructure. In the thickness direction of the sound-absorbing cotton body, the height H of the acoustic superstructure is 80%-120% of the groove depth L of the receiving groove.

2. The sound absorbing cotton assembly according to claim 1, characterized in that, The difference in resonant frequencies between at least two resonant units of the acoustic superstructure is greater than or equal to 50 Hz.

3. The sound-absorbing cotton assembly according to claim 1, characterized in that, The sum of the number of the resonant units with a resonant frequency of 20Hz to 1200Hz is greater than or equal to 80% of the total number of all the resonant units.

4. The sound absorbing cotton assembly according to claim 1, characterized in that, The area ratio of all the acoustic superstructures relative to the sound-absorbing cotton body is 30% to 40%.

5. The sound absorbing cotton assembly according to claim 1, characterized in that, The thickness of the first structural layer is less than the thickness of the second structural layer. The first structural layer includes at least one layer selected from PVC and rubber. The second structural layer includes at least one layer selected from needle-punched felt, polyurethane cotton, PU foam, and glass wool.

6. The sound absorbing cotton assembly according to claim 1, characterized in that, The thickness t of the film is less than or equal to 1 / 3 of the depth L of the receiving groove.

7. The acoustic cotton assembly according to any one of claims 1-6, characterized in that, The resonant unit satisfies at least one of the following three conditions: Condition 1, the thickness t of the thin film is 0.1 mm < t ≤ 0.5 mm; Condition 2, the mass of the mass block is 0.001 g ~ 0.002 g; Condition 3, the elastic modulus of the thin film is 15 MPa to 25 MPa.

8. A compressor characterized by, It includes a compressor body and a sound-absorbing cotton assembly according to any one of claims 1-7, wherein the sound-absorbing cotton assembly covers the outer surface of the compressor body.

9. An outdoor unit of an air conditioner, characterized by comprising: It includes an outdoor heat exchanger and a compressor according to claim 8, wherein the outdoor heat exchanger is connected to the compressor body.

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