Noise reduction structure, compressor and refrigeration equipment

Abstract

The invention discloses a noise reduction structure, a compressor and refrigeration equipment. The noise reduction structure comprises a bottom plate, a plurality of first surrounding cavity structures and a plurality of second surrounding cavity structures. The multiple first enclosure cavity structures are distributed on the surface, facing the sound source, of the bottom plate at intervals, a first airtight cavity is formed between the first enclosure cavity structures and the bottom plate, and at least one wall face, forming the first airtight cavity, of the first enclosure cavity structures is a first vibration wall; at least two spaced second enclosed cavity structures are arranged in the first airtight cavity, the second enclosed cavity structures are connected with the bottom plate to form a second airtight cavity, and at least one wall surface, forming the second airtight cavity, of the second enclosed cavity structures is a second vibration wall. According to the technical scheme, the dual sound absorption and insulation effects are achieved, the frequency range capable of absorbing noise is widened, when the noise reduction structure is applied to the compressor, noise in the range from low frequency to intermediate frequency of the compressor can be effectively reduced, and the better noise reduction and sound insulation effects are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a noise reduction structure, a compressor and a refrigeration device. Background Art

[0002] In the related art, compressors are widely used in refrigeration equipment such as air conditioners and refrigerators. During the operation of the compressor, various internal components such as motors, pistons and internal airflow will generate electromagnetic noise, mechanical noise and aerodynamic noise. However, the existing sound insulation or sound absorption structure has a poor noise reduction effect on the compressor, resulting in poor user experience. Summary of the invention

[0003] The main purpose of the present invention is to propose a noise reduction structure, aiming to achieve better noise reduction and sound insulation effects on the compressor and enhance user experience.

[0004] To achieve the above object, the noise reduction structure proposed in the present invention includes:

[0005] Base plate;

[0006] a plurality of first cavity structures, spaced apart and distributed on the surface of the bottom plate facing the sound source, a first airtight cavity is formed between the first cavity structures and the bottom plate, and at least one wall surface of the first cavity structure forming the first airtight cavity is a first vibration wall; and

[0007] Multiple second cavity structures, at least two spaced-apart second cavity structures are arranged in the first airtight cavity, the second cavity structure is connected to the bottom plate to form a second airtight cavity, and at least one wall surface of the second cavity structure forming the second airtight cavity is a second vibration wall.

[0008] In one embodiment, at least two of the second airtight chambers in the same first airtight chamber are not connected to each other.

[0009] In one embodiment, volumes of at least two adjacent second airtight cavities in the same first airtight cavity are different.

[0010] In one embodiment, in the same first airtight cavity, two adjacent second enclosure structures have the same bottom dimensions but different height dimensions.

[0011] In one embodiment, the number of the second enclosed cavity structures in at least two adjacent first airtight cavities is different.

[0012] In one embodiment, the at least two second enclosure structures in the same first airtight cavity are distributed in a rectangular array;

[0013] And / or, a plurality of the first enclosure structures are distributed in a rectangular array.

[0014] In one embodiment, an outer wall surface of each of the second cavity structures is provided with a gap from an inner wall surface of the first cavity structure.

[0015] In one embodiment, a wall surface of the first enclosure structure facing away from the bottom plate is the first vibration wall; and / or a wall surface of the second enclosure structure facing away from the bottom plate is the second vibration wall.

[0016] In one embodiment, a first flat membrane is connected between two adjacent first cavity structures, and the first flat membrane and the first cavity structure are an integrated thin film member;

[0017] A second flat membrane is connected between two adjacent second cavity structures, and the second flat membrane and the second cavity structure are an integrated thin film member;

[0018] The second flat film is attached and fixed to the bottom plate, the first flat film is attached to a side of the second flat film away from the bottom plate, and the first enclosure structure is covered on the outside of the second enclosure structure.

[0019] In one embodiment, a wall thickness dimension D1 of the first vibration wall satisfies: D1≤1 mm; and / or a wall thickness dimension D2 of the second vibration wall satisfies: D2≤1 mm.

[0020] In one embodiment, the height of the first enclosure structure is defined as H1, and the height of the second enclosure structure is defined as H2, satisfying the following conditions: 20 mm ≤ H1 ≤ 30 mm, 10 mm ≤ H2 ≤ 20 mm, and H1>H2.

[0021] To achieve the above objectives, the present invention also provides a compressor, including a compressor body and the above-mentioned noise reduction structure, wherein the noise reduction structure is wrapped around the outer periphery of the compressor body, and the multiple first cavity structures are arranged on the surface of the bottom plate facing the compressor body.

[0022] To achieve the above object, the present invention also provides a refrigeration device, including the above compressor.

[0023] In the noise reduction structure of the technical solution of the present invention, a plurality of first cavity structures are distributed on the surface of the bottom plate facing the sound source, and the first cavity structure is connected to the bottom plate to form a first airtight cavity, and at least one of the walls of the first cavity structure forming the first airtight cavity is a first vibration wall, so that the first vibration wall and the first airtight cavity form a resonance system, which can absorb and isolate the transmitted noise. At the same time, at least two second cavity structures are provided in the first airtight cavity, and the second cavity structure is connected to the bottom plate to form a second airtight cavity, and at least one of the walls of the second cavity structure forming the second airtight cavity is a second vibration wall, so that the second vibration wall and the second airtight cavity form a resonance system, which can further absorb and isolate noise, realize dual sound absorption and sound insulation, and widen the frequency range of noise that can be absorbed. When the noise reduction structure is applied to a compressor, it can effectively reduce the noise in the low-frequency to medium-frequency range of the compressor, and achieve better noise reduction and sound insulation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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 the structures shown in these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of an embodiment of a noise reduction structure of the present invention;

[0026] Figure 2 A full cross-sectional view of an embodiment of the noise reduction structure of the present invention;

[0027] Figure 3 for Figure 2 A partial enlarged view of the M in the middle;

[0028] Figure 4 It is a structural schematic diagram of another embodiment of the noise reduction structure of the present invention;

[0029] Figure 5 It is a structural schematic diagram of another embodiment of the noise reduction structure of the present invention.

[0030] Description of Figure Numbers:

[0031] Label name Label name 1 Base Plate 31 Second enclosure structure 21 The first enclosure structure 31a Second vibrating wall 21a First vibrating wall 301 Second airtight chamber 201 The first airtight cavity 32 Second flat film 22 The first flat film

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their 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 addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The present invention proposes a noise reduction structure that can be wrapped or attached to the outside of a sound source structure such as a compressor to achieve noise reduction and sound insulation effects, especially for low-frequency to medium-frequency noise, and improves the user experience. The noise reduction structure is described below.

[0038] In the embodiment of the present invention, Figures 1 to 5 As shown, the noise reduction structure includes a base plate 1 , a plurality of first enclosure structures 21 and a plurality of second enclosure structures 31 .

[0039] A plurality of first cavity structures 21 are distributed at intervals on the surface of the bottom plate 1 facing the sound source, a first airtight cavity 201 is formed between the first cavity structure 21 and the bottom plate 1, and at least one wall surface of the first airtight cavity 201 formed by the first cavity structure 21 is a first vibration wall 21a;

[0040] At least two spaced second cavity structures 31 are provided in the first airtight cavity 201 . The second cavity structures 31 are connected to the bottom plate 1 to form the second airtight cavity 301 . At least one wall surface of the second cavity structure 31 forming the second airtight cavity 301 is a second vibration wall 31 a .

[0041] In this embodiment, a plurality of first cavity structures 21 are arranged on the surface of the bottom plate 1 facing the sound source, and the first cavity structures 21 and the bottom plate 1 form a first airtight cavity 201. It can be understood that the first airtight cavity 201 is a closed gas cavity, and at least one of the wall surfaces of the first cavity structure 21 forming the first airtight cavity 201 is arranged as a first vibration wall 21a, so that the first vibration wall 21a and the airtight cavity 201 form a first resonance system (such as a thin film resonance sound absorption structure). When the sound propagates from the sound source to the first cavity structure 21 and contacts with the first vibration wall 21a, and the first vibration wall 21a is excited by the sound wave and the excitation frequency is consistent with the frequency of the first resonance system, the first resonance system formed by the first vibration wall 21a and the first airtight cavity 201 will resonate, and the vibration of the first vibration wall 21a will consume the energy of the sound wave to achieve the sound absorption effect. At the same time, the first airtight cavity 201 can also play a sound insulation role. On this basis, at least two spaced-apart second cavity structures 31 are provided in the first airtight cavity 201, and the second cavity structure 31 is connected to the bottom plate 1 to form a second airtight cavity 301. At least one of the walls of the second cavity structure 31 forming the second airtight cavity 301 is a second vibration wall 31a, so that the second vibration wall 31a and the second airtight cavity 301 form a second resonance system (such as a thin film resonance sound absorption structure). When the sound is transmitted from the first airtight cavity 201 to the second vibration wall 31a, the second vibration wall 31a is excited by the sound wave and the excitation frequency is consistent with the frequency of the first resonance system, the second resonance system will resonate, and the vibration of the second vibration wall 31a will consume the energy of the sound wave to achieve the sound absorption effect. At the same time, the second airtight cavity 301 can also play a further sound insulation role. In this way, after the double sound absorption and sound insulation effect, a better noise reduction effect is achieved. The second enclosure structure 31 is located inside the first airtight cavity 201, and the volumes of the first airtight cavity 201 and the second airtight cavity 301 are different, and the resonant sound absorption frequencies of the second resonance system and the first resonance system are different, so that the corresponding noise frequencies of the two are also different, so that the sound absorption frequency coverage range is wider, and it can absorb noise of a wider frequency, and effectively reduce the noise in the low-frequency to medium-frequency band gap.

[0042] It should be noted that in this embodiment, at least two second cavity structures 31 are provided in a first airtight cavity 201. Compared with the solution of providing a second cavity structure 31 in a first airtight cavity 201, the absorbable noise frequency can be further broadened, and the sound insulation effect of 7dB-10dB can be further enhanced in the low-frequency to medium-frequency band gap. As an example, the noise reduction structure in this embodiment and the solution of providing a second cavity structure 31 in a first airtight cavity 201 were evaluated by the same sound source experiment, and it was found that in the frequency band gap of 500-6000Hz, the noise reduction structure in this embodiment can achieve an average sound transmission loss (STL) of 45-55dB, and compared with the solution of providing a second cavity structure 31 in a first airtight cavity 201, the sound insulation effect of 7dB-10dB can be further enhanced. It shows that the noise reduction structure of this embodiment has better noise reduction ability.

[0043] At least two spaced second cavity structures 31 are provided in the first airtight cavity 201. It is understandable that two second cavity structures 31 or multiple second cavity structures 31 can be provided in the first airtight cavity 201. The noise frequency bands corresponding to different settings are different. In actual applications, the number of second cavity structures 31 in different first airtight cavities 201 can be the same or different. When different, the number of second cavity structures 31 in all first airtight cavities 201 can be different, or the number of second cavity structures 31 in each adjacent two first airtight cavities 201 can be different, or the number of second cavity structures 31 in irregular scattered first airtight cavities 201 can be different. The specific setting method is not limited here. In actual applications, the second cavity structures 31 can be set in the first airtight cavity 201 as 2, 3, 4, 5 or 6, etc.

[0044] At least one of the walls of the first airtight cavity 201 formed by the first cavity structure 21 is a first vibration wall 21a. It can be understood that only one wall of the first cavity structure 21 is a first vibration wall 21a, or multiple or all walls of the first cavity structure 21 are first vibration walls 21a. When only one or part of the walls of the first cavity structure 21 are first vibration walls 21a, the other structures of the first cavity structure 21 can be rigid parts to support or tension the first vibration wall 21a so that the first vibration wall 21a can be stimulated by sound and vibrate. When all the walls of the first cavity structure 21 are first vibration walls 21a, the first cavity structure 21 itself can be a thin film structure as a whole. When sound propagates, each wall of the first cavity structure 21 can vibrate accordingly. As an example, the wall of the first enclosure structure 21 facing the sound source is the first vibration wall 21a. At this time, the sound wave is incident from the first vibration wall 21a, which has a better excitation effect on the first vibration wall 21a, thereby consuming more sound wave energy and achieving better sound absorption and noise reduction effects.

[0045] Correspondingly, at least one of the walls of the second airtight cavity 301 formed by the second cavity structure 31 is the second vibration wall 31a, and only one wall of the second cavity structure 31 may be the second vibration wall 31a, or multiple or all walls of the second cavity structure 31 may be the second vibration wall 31a. When only one or part of the walls of the second cavity structure 31 are the second vibration wall 31a, the other structures of the second cavity structure 31 may be rigid parts, supporting or tensioning the second vibration wall 31a, so that the second vibration wall 31a can be excited by sound and vibrate. When all the walls of the second cavity structure 31 are the second vibration walls 31a, the second cavity structure 31 itself may be a thin film structure as a whole, and when sound is transmitted, each wall of the second cavity structure 31 may vibrate accordingly. As an example, the wall of the second enclosure structure 31 facing the sound source is the second vibration wall 31a. At this time, the sound wave is incident from the second vibration wall 31a, which has a better excitation effect on the second vibration wall 31a, thereby consuming more sound wave energy and achieving better sound absorption and noise reduction effects.

[0046] Optionally, the bottom plate 1 may be a hard plate structure or a flexible plate structure.

[0047] It should be noted that the noise reduction structure in this embodiment forms a closed first airtight cavity 201 /

[0048] The second airtight cavity 301, compared with the Helmholtz resonance sound absorption method, does not require openings in the structure of this solution. When applied to compressors or other sound source structures, there is no need to worry about external water vapor such as rain entering, and it does not support bacterial growth, ensuring cleanliness. Optionally, the noise reduction structure can be made translucent, which has an aesthetic appearance and allows staff to see the internal structure clearly.

[0049] In the noise reduction structure of the technical solution of the present invention, multiple first cavity structures 21 are distributed on the surface of the bottom plate 1 facing the sound source. The first cavity structure 21 is connected to the bottom plate 1 to form a first airtight cavity 201. At least one of the walls of the first airtight cavity 201 formed by the first cavity structure 21 is a first vibration wall 21a, so that the first vibration wall 21a and the first airtight cavity 201 form a resonance system, which can absorb and isolate the transmitted noise. At the same time, at least two second cavity structures 31 are provided in the first airtight cavity 201, and the second cavity structure 31 is connected to the bottom plate 1 to form a second airtight cavity 301. At least one of the walls of the second cavity structure 31 forming the second airtight cavity 301 is a second vibration wall 31a, so that the second vibration wall 31a and the second airtight cavity 301 form a resonance system, which can further absorb and isolate noise, realize dual sound absorption and sound insulation effects, and widen the frequency range of absorbable noise. When the noise reduction structure is applied to a compressor, it can effectively reduce the noise in the low-frequency to medium-frequency range of the compressor, thereby achieving better noise reduction and sound insulation effects.

[0050] In one embodiment of the present invention, please refer to Figures 1 to 5 , at least two second airtight chambers 301 in the same first airtight chamber 201 are not connected to each other.

[0051] It can be understood that the second cavity structure 31 is connected to the base plate 1 to form a second airtight cavity 301, and the second vibration wall 31a and the second airtight cavity 301 together constitute a resonance system (thin film resonance sound absorption structure). If the multiple second airtight cavities 301 in the same first airtight cavity 201 are connected to each other, then the multiple second airtight cavities 301 formed by the multiple second cavity structures 31 and the base plate 1 are connected as a whole, and the corresponding noise frequency band is relatively single. In this embodiment, by making at least two second airtight cavities 301 in the same first airtight cavity 201 unconnected to each other, at least two resonance systems are independent of each other, so that there will be no structural interference during vibration sound absorption, thereby ensuring the vibration performance of the second vibration walls 31a of the two adjacent second cavity structures 31, and the corresponding noise absorption frequency band is wider, thereby improving the noise reduction capability.

[0052] In one embodiment of the present invention, please refer to Figures 1 to 5 , the volumes of at least two adjacent second airtight chambers 301 in the same first airtight chamber 201 are different.

[0053] In this embodiment, by setting the volumes of at least two adjacent second airtight chambers 301 in the same first airtight chamber 201 to be different, the resonant frequencies of at least two adjacent resonance systems are different, so that the frequency of the sound that can be absorbed is wider, and the noise in the low-frequency to medium-frequency band gap range can be effectively reduced. Of course, the volumes of the two adjacent first airtight chambers 201 can also be set to be different, further broadening the frequency range of the sound that can be absorbed, generating a mixed acoustic impedance, and achieving broadband sound insulation and sound absorption performance.

[0054] In other embodiments, the volumes of the second airtight cavities 301 in different first airtight cavities 201 may be set to be the same or different, so as to further expand the range of absorbable noise frequencies and enhance the noise reduction effect.

[0055] In one embodiment of the present invention, please refer to Figure 5 In the same first airtight cavity 201, the bottom dimensions of two adjacent second enclosure structures 31 are the same, but the height dimensions are different.

[0056] It can be understood that the second enclosure structure 31 and the bottom plate 1 form a second airtight cavity 301, and the second vibration wall 31a and the second airtight cavity 301 form a resonance system (thin film resonance sound absorption structure), then the resonance sound absorption frequency f0 is related to the air layer thickness h of the second airtight cavity 301 and the surface density m of the second vibration wall 31a: That is, when the air layer thickness h and / or the surface density m of the vibration wall are changed, the resonant sound absorption frequency f0 will change, and the frequency that can absorb noise will also change. In this embodiment, by setting the height dimensions of the two adjacent second enclosure structures 31 to be different, the air layer thicknesses of the two adjacent second airtight cavities 301 are different, and the frequencies of noise absorption corresponding to the two adjacent resonance systems are also different, so that noise of a wider frequency can be absorbed, and the noise in the low-frequency to medium-frequency band gap can be effectively reduced.

[0057] In this embodiment, the bottom surface dimensions of two adjacent second cavity structures 31 are set to be the same, so that the two adjacent second cavity structures 31 can change the frequency of sound absorption by changing the height dimension, thereby widening the frequency range of sound absorption. In addition, the bottom surface shape and dimensions of multiple second cavity structures 31 are set to be the same, which simplifies the mold structure design. There is no need to change the mold shape. The function of different heights of two adjacent second cavity structures 31 can be achieved by only changing the height dimension at the mold cavity, thereby improving the molding manufacturing efficiency.

[0058] In one embodiment, the heights of two adjacent first enclosure structures 21 may be set to be different, so that the air layer thicknesses of two adjacent first airtight cavities 201 are different, and the frequencies of noise absorbed by two adjacent resonance systems are also different, thereby being able to absorb noise of a wider frequency.

[0059] In one embodiment of the present invention, please refer to Figures 1 to 5 The first cavity structure 21 and the second cavity structure 31 are cubic structures, and the bottom surface shape of the first cavity structure 21 and the bottom surface shape of the second cavity structure 31 are similar to each other.

[0060] It can be understood that the first cavity structure 21 and the second cavity structure 31 are set as a cubic structure, such as a cube structure or a rectangular parallelepiped structure. This configuration simplifies the overall structure, makes it easier to form and manufacture, and facilitates installation. By making the bottom surface shape of the first cavity structure 21 and the bottom surface shape of the second cavity structure 31 similar to each other, the mold structure design is simplified, and the first cavity structure 21 and the second cavity structure 31 can be realized by only changing the size ratio or height size without additionally changing the mold shape.

[0061] Furthermore, the corners of the first enclosure structure 21 and the second enclosure structure 31 facing away from the bottom plate 1 can be rounded, so that the first enclosure structure 21 and the second enclosure structure 31 form a cubic wedge-shaped structure, which is more convenient for molding and manufacturing, such as blow molding. In addition, the rounded edge structure can increase the area in contact with the sound wave, increase the vibration area, and further improve the sound absorption effect.

[0062] In one embodiment of the present invention, please refer to Figure 4 , the number of second enclosure structures 31 in at least two adjacent first airtight cavities 201 is different.

[0063] It can be understood that, taking a first enclosure structure 21 and at least two second enclosure structures 31 therein as a noise reduction unit as an example, the noise frequency band corresponding to each noise reduction unit is related to the sound absorption frequency of the first resonance system formed by the first vibration wall 21a and the first airtight cavity 201 and the second resonance system formed by the second vibration wall 31a and the second airtight cavity 301. The noise reduction effect of each noise reduction unit is achieved through the combined action of the first resonance system and the second resonance system. When the number of second enclosure structures 31 in different noise reduction units is different, the noise frequency band that can be absorbed by the noise reduction unit will also change. In this embodiment, by setting the number of second enclosure structures 31 in at least two adjacent first airtight cavities 201 to be different, the noise frequency bands corresponding to different noise reduction units are also different, thereby achieving a wider frequency band sound absorption effect.

[0064] In some other embodiments, the number of second enclosure structures 31 in two adjacent first airtight cavities 201 may also be set to be the same. In this embodiment, the sound absorption intensity of noise in the same frequency band can be enhanced, and the sound absorption intensity can be more targeted.

[0065] In one embodiment of the present invention, please refer to Figures 1 to 5 , at least two second cavity structures 31 in the same first airtight cavity 201 are distributed in a rectangular array; and / or, multiple first cavity structures 21 are distributed in a rectangular array.

[0066] In this embodiment, by distributing the plurality of second cavity structures 31 in the same first airtightness 201 in a rectangular array, the distribution of the plurality of second cavity structures 31 is more uniform, the structure is simple, and it is easy to form and assemble. In addition, the plurality of second cavity structures 31 are distributed in a rectangular array, which increases the sound absorption and sound insulation area of ​​the noise reduction structure, and at the same time makes the continuity of the noise absorption of the entire noise reduction structure better.

[0067] Correspondingly, by distributing the plurality of first enclosure structures 21 in a rectangular array, the sound absorption and sound insulation area of ​​the noise reduction structure is increased, and at the same time, the continuity of the noise absorption of the entire noise reduction structure is improved.

[0068] In one embodiment of the present invention, please refer to Figures 1 to 5 The outer wall surface of each second cavity structure 31 is provided with a gap with the inner wall surface of the first cavity structure 21 .

[0069] It can be understood that the second cavity structure 31 is arranged inside the first cavity structure 21. In this embodiment, a gap is set between the outer wall of the second cavity structure 31 and the inner wall of the first cavity structure 21, so that the overall structure of the second cavity structure 31 is set with a gap between the overall structure of the first cavity structure 21, that is, the second cavity structure 31 is not in contact with the first cavity structure 21. Then, the first resonance system and the second resonance system will not be subject to structural interference during vibration and sound absorption, thereby ensuring the vibration performance of the first vibration wall 21a and the second vibration wall 31a and improving the noise reduction capability.

[0070] In one embodiment of the present invention, please refer to Figures 1 to 5 The wall surface of the first enclosure structure 21 away from the bottom plate 1 is the first vibration wall 21a; and / or the wall surface of the second enclosure structure 31 away from the bottom plate 1 is the second vibration wall 31a.

[0071] It can be understood that the first enclosure structure 21 is arranged on the surface of the base plate 1 facing the sound source. By setting the wall surface of the first enclosure structure 21 facing away from the base plate 1 as the first vibration wall 21a, the low- and medium-frequency sound waves can be incident vertically from the first vibration wall 21a. Then, the sound excitation intensity received by the first vibration wall 21a is greater, and the vibration amplitude of the first vibration wall 21a is greater, so that more sound wave energy can be converted into mechanical energy of the first vibration wall 21a, thereby achieving a better sound absorption effect on low- and medium-frequency sounds and improving the noise reduction capability.

[0072] Similarly, by setting the wall surface of the second enclosure structure 31 facing away from the bottom plate 1 as the second vibration wall 31a, the sound waves can be incident vertically from the second vibration wall 31a. Then, the sound excitation intensity received by the second vibration wall 31a is greater, and the vibration amplitude of the second vibration wall 31a is greater, so that more sound wave energy can be converted into mechanical energy of the second vibration wall 31a, thereby achieving a better sound absorption effect.

[0073] As an example, see Figures 1 to 3 The first vibration wall 21a is arranged parallel to and opposite to the bottom plate 1, and the second vibration wall 31a is arranged between the first vibration wall 21a and the bottom plate 1, so that the first vibration wall 21a and the second vibration wall 31a are arranged parallel to and opposite to each other, the first vibration wall 21a and the second vibration wall 31a can vibrate independently without being interfered with, and at the same time, the noise generated by the sound source can be transmitted from the bottom plate 1 after being attenuated by the first vibration wall 21a, the first airtight cavity 201, the second vibration wall 31a and the second airtight cavity 301 in sequence, and the noise reduction effect is better.

[0074] Optionally, the first vibration wall 21 a is a vibration film, such as an elastic film.

[0075] Optionally, the second vibration wall 31 a is a vibration film, such as an elastic film.

[0076] For further information, see Figure 3 In order to ensure the vibration sound absorption effect, the wall thickness dimension D1 of the first vibration wall 21a satisfies: D1≤1mm. It can be understood that the wall thickness dimension of the first vibration wall 21a cannot be too large. If it is too large, the rigidity of the first vibration wall 21a is too strong, resulting in poor vibration effect and affecting the sound absorption effect. Based on this, in this embodiment, the wall thickness dimension D1 of the first vibration wall 21a is set to be no more than 1mm to ensure the vibration sensitivity of the first vibration wall 21a and improve the sound absorption effect.

[0077] Similarly, the wall thickness of the second vibration wall 31a cannot be too large. If it is too large, the rigidity of the second vibration wall 31a will be too strong, resulting in poor vibration effect and affecting the sound absorption effect. Based on this, in this embodiment, the wall thickness D2 of the second vibration wall 31a is set to be no more than 1 mm to ensure the vibration sensitivity of the second vibration wall 31a and improve the sound absorption effect.

[0078] In one embodiment of the present invention, please refer to Figures 1 to 5 A first flat membrane 22 is connected between two adjacent first cavity structures 21, and the first flat membrane 22 and the first cavity structure 21 are an integral film member; a second flat membrane 32 is connected between two adjacent second cavity structures 31, and the second flat membrane 32 and the second cavity structure 31 are an integral film member; the second flat membrane 32 is adhered and fixed to the bottom plate 1, the first flat membrane 22 is adhered to the side of the second flat membrane 32 away from the bottom plate 1, and the first cavity structure 21 is covered on the outside of the second cavity structure 31.

[0079] In this embodiment, a plurality of first flat membranes 22 connect a plurality of first cavity structures 21 into an integral thin film member, and a plurality of second flat membranes 32 connect a plurality of second cavity structures 31 into an integral thin film member. By fitting and fixing the second flat membranes 32 to the base plate 1, the first flat membranes 22 are fitted and fixed to the second flat membranes 32, so that the first cavity structure 21 can be covered on the outside of the second cavity structure 31, thereby forming a first airtight cavity 201 and a second airtight cavity 301.

[0080] Optionally, the second flat membrane 32 is fixedly connected to the bottom plate 1 by gluing; the first flat membrane 22 is fixedly connected to the second flat membrane 32 by gluing.

[0081] As an example, the integrated film piece is formed by polypropylene suction molding or blow molding. Optionally, in order to ensure the strength of the film and the sound absorption effect of low-frequency noise, the integrated film piece of the noise reduction structure is made of polypropylene (PP) with a mass density of 910Kg / m3.

[0082] In one embodiment of the present invention, please refer to Figure 3 , define the height of the first enclosure structure 21 as H1, and the height of the second enclosure structure 31 as H2, satisfying: 20mm≤H1≤30mm, 10mm≤H2≤20mm, H1>H2.

[0083] It is understandable that the thickness of the air layer should not be too large or too small. If it is too large, it will easily affect the sound absorption effect, and if it is too small, it will easily cause interference between the vibration wall and the bottom plate 1. In this embodiment, the height H1 of the first enclosure structure 21 is set to satisfy 20mm≤H1≤30mm, and the height H2 of the second enclosure structure 31 satisfies: 10mm≤H2≤20mm, H1>H2, thereby ensuring the sound absorption and noise reduction effect while preventing interference between the first vibration wall 21a, the second vibration wall 31a and the bottom plate 1. As an example, the height H of the enclosure structure 2 satisfies: 10mm≤H≤20mm.

[0084] In practical applications, the height H1 of the first enclosure structure 21 can be 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm or 30 mm, etc. The height H2 of the second enclosure structure 31 can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm, etc.

[0085] As an example, the height H1 of the first enclosure structure 21 is 30 mm, and the height H2 of the second enclosure structure 31 is 20 mm.

[0086] The present invention also proposes a compressor, which includes a compressor body and a noise reduction structure. The specific structure of the noise reduction structure refers to the above embodiment. Since the compressor adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the noise reduction structure is wrapped around the periphery of the compressor body, and multiple first enclosure structures 21 are arranged on the surface of the bottom plate 1 facing the compressor body.

[0087] In this embodiment, by arranging multiple first cavity structures 21 toward the compressor body, the noise generated inside the compressor body can first be transmitted to the first cavity structure 21, and sound absorption and sound insulation are performed through the resonance system formed by the first cavity structure 21, the first airtight cavity 201 of the bottom plate 1, and the first vibration wall 21a. At the same time, it can be further transmitted to the second cavity structure 31 inside the first cavity structure 21, and sound absorption and sound insulation are performed again through the resonance system formed by the second cavity structure 31, the second airtight cavity 301 of the bottom plate 1, and the second vibration wall 31a, thereby enhancing the noise reduction effect of the compressor body, especially having a good sound insulation effect on the low-frequency to medium-frequency noise of the compressor.

[0088] Optionally, the noise reduction structure is wrapped around the periphery of the compressor body and is fixed by bonding at both ends of the bottom plate 1 to ensure the wrapping effect of the noise reduction structure on the compressor body.

[0089] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0090] Optionally, the refrigeration equipment may be an air conditioner, a refrigerator, a cold chain vehicle, and the like.

[0091] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A noise reduction structure, characterized in that: include: Base plate; A plurality of first cavity structures are spaced apart and distributed on the surface of the bottom plate facing the sound source, a first airtight cavity is formed between the first cavity structures and the bottom plate, and at least one wall surface of the first airtight cavity formed by the first cavity structures is a first vibration wall; as well as Multiple second cavity structures, at least two spaced-apart second cavity structures are arranged in the first airtight cavity, the second cavity structure is connected to the bottom plate to form a second airtight cavity, and at least one wall surface of the second cavity structure forming the second airtight cavity is a second vibration wall.

2. The noise reduction structure according to claim 1, characterized in that: At least two of the second airtight chambers in the same first airtight chamber are not connected to each other.

3. The noise reduction structure according to claim 2, characterized in that: The volumes of at least two adjacent second airtight cavities in the same first airtight cavity are different.

4. The noise reduction structure according to claim 3, characterized in that: In the same first airtight cavity, two adjacent second enclosure structures have the same bottom dimensions but different height dimensions.

5. The noise reduction structure according to claim 1, characterized in that: The number of the second enclosed cavity structures in at least two adjacent first airtight cavities is different.

6. The noise reduction structure according to any one of claims 1 to 5, characterized in that: The at least two second enclosure structures in the same first airtight cavity are distributed in a rectangular array; And / or, a plurality of the first enclosure structures are distributed in a rectangular array.

7. The noise reduction structure according to claim 6, characterized in that: An outer wall surface of each of the second cavity structures is provided with a gap from an inner wall surface of the first cavity structure.

8. The noise reduction structure according to any one of claims 1 to 5, characterized in that: The wall surface of the first enclosure structure away from the bottom plate is the first vibration wall; and / or the wall surface of the second enclosure structure away from the bottom plate is the second vibration wall.

9. The noise reduction structure according to claim 8, characterized in that: A first flat membrane is connected between two adjacent first cavity structures, and the first flat membrane and the first cavity structure are an integrated thin film member; A second flat membrane is connected between two adjacent second cavity structures, and the second flat membrane and the second cavity structure are an integrated thin film member; The second flat film is attached and fixed to the bottom plate, the first flat film is attached to a side of the second flat film away from the bottom plate, and the first enclosure structure is covered on the outside of the second enclosure structure.

10. The noise reduction structure according to any one of claims 1 to 5, characterized in that: The wall thickness dimension D1 of the first vibration wall satisfies: D1≤1 mm; and / or the wall thickness dimension D2 of the second vibration wall satisfies: D2≤1 mm.

11. The noise reduction structure according to any one of claims 1 to 5, characterized in that: The height of the first enclosure structure is defined as H1, and the height of the second enclosure structure is defined as H2, satisfying the following conditions: 20 mm ≤ H1 ≤ 30 mm, 10 mm ≤ H2 ≤ 20 mm, and H1>H2.

12. A compressor, characterized in that: It comprises a compressor body and a noise reduction structure as claimed in any one of claims 1 to 11, wherein the noise reduction structure is wrapped around the outer periphery of the compressor body, and the plurality of first enclosure structures are arranged on the surface of the bottom plate facing the compressor body.

13. A refrigeration device, characterized in that: Comprising the compressor of claim 12.

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