A broadband composite noise reduction structure for a compressor of a refrigeration device

Abstract

The utility model provides a kind of compressor broadband composite noise reduction structure for refrigeration equipment, it is specifically related to compressor noise reduction technical field.The noise reduction structure is used to be surrounded in the periphery of compressor and there is gap between the noise reduction structure and compressor, the noise reduction structure is U-shaped structure, including side plate and the wing plate of side plate left and right sides;The side plate and wing plate all include sound-absorbing layer, flow guide layer and resonance layer from inside to outside;The resonance layer is fixed with flow guide layer by base plate;Several polypropylene plastic partition blocks are arranged between the flow guide layer and base plate;The side of flow guide layer close to compressor is also provided with several radiating fins at equal intervals.The utility model has realized to the efficient and accurate absorption of compressor broadband, especially low-frequency peak noise, while solve the contradiction between noise reduction device and compressor heat dissipation, improve the operation reliability and service life of compressor.

Description

Technical Field

[0001] This utility model relates to the field of compressor noise reduction technology, specifically to a wideband composite noise reduction structure for compressors used in refrigeration equipment. Background Technology

[0002] The compressor, a core component of refrigeration equipment such as refrigerators and freezers, generates broadband noise during operation. Its energy is primarily concentrated in the low-frequency range (e.g., 100-500Hz), but it also contains a significant amount of mid-to-high-frequency noise. This noise not only affects user experience but may also violate increasingly stringent noise regulations. The closest existing solution to this invention is a device that simply combines sound-absorbing materials with a resonant structure, for example, filling the rear of the resonant cavity with sound-absorbing cotton. However, such solutions typically fail to effectively divide and guide sound waves, resulting in a lack of coordinated operation among components. Mid-to-high-frequency sound waves interfere with the performance of the resonant cavity, and low-frequency sound waves are not efficiently collected, leading to suboptimal overall noise reduction efficiency. Furthermore, these solutions often neglect the crucial heat dissipation requirements of the compressor, failing to provide effective ventilation and heat dissipation paths in the structural design, which can easily lead to overheating.

[0003] There are four common noise reduction methods, but each has its own problems: 1. Passive sound insulation: Encasing the compressor entirely in a soundproof enclosure or with soundproof panels. While effective, this method severely hinders compressor heat dissipation, poses safety hazards, and has limited effectiveness in suppressing low-frequency noise. 2. Sound absorption with porous materials: Laying sound-absorbing cotton (such as glass wool or rock wool) inside the compressor compartment. This method has a good absorption effect on mid-to-high frequency noise, but its absorption efficiency for low-frequency noise is very low, making it difficult to solve the core problem of compressor noise. 3. Helmholtz resonator: Utilizing the resonance effect of the cavity and neck structure to absorb specific low-frequency frequencies. However, traditional single-cavity Helmholtz resonators can only target a single frequency and cannot cover multiple harmonic peaks of compressor noise. Using multiple independent resonators leads to complex structures, large space requirements, and high costs. 4. Combined solutions: Usually, sound waves are not effectively divided and guided, and the components fail to work together. Mid-to-high frequency sound waves interfere with the performance of the resonant cavity, and low-frequency sound waves are not efficiently collected, resulting in suboptimal overall noise reduction efficiency. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a wideband composite noise reduction structure for compressors in refrigeration equipment, the specific technical solution of which is as follows:

[0005] A broadband composite noise reduction structure for compressors in refrigeration equipment is provided, which surrounds the compressor and has a gap between it and the compressor. The noise reduction structure is U-shaped and includes a side plate and wing plates on the left and right sides of the side plate. The side plate and wing plates include a sound-absorbing layer, a flow-guiding layer and a resonant layer from the inside to the outside. The resonant layer is fixed to the flow-guiding layer through a substrate. A number of polypropylene plastic spacers are provided between the flow-guiding layer and the substrate. A number of heat dissipation fins are also provided at equal intervals on the side of the flow-guiding layer near the compressor.

[0006] Preferably, the surface of the resonant layer is stamped to form a plurality of chambers arranged in a matrix; the chamber sizes include three types: 50mm*30mm, 40mm*24mm and 30mm*18mm, which are used for resonant noise reduction of three key low-frequency noises of the compressor at 180Hz, 250Hz and 350Hz respectively; the height-to-diameter ratio of the plurality of chambers ranges from 0.55 to 0.7.

[0007] Preferably, the flow guide layer of the side plate and the two wing plates is provided with several through slots in the transverse direction; the position of each through slot corresponds to the position of one of the horizontal chambers.

[0008] Preferably, the sound-absorbing layer is laid on the surface of the flow guide layer near the compressor and close to the sidewall of the heat dissipation fins.

[0009] Preferably, the installation position of each of the polypropylene plastic blocks corresponds to the position of one of the vertically arranged chambers;

[0010] The polypropylene plastic partition is provided with a first through hole corresponding to the position of each chamber; the substrate is provided with a second through hole corresponding to the position of the first through hole; the first through hole and the second through hole form an acoustic cavity neck and communicate with the corresponding chamber; the thickness of the polypropylene plastic partition is 4mm; the thickness of the substrate is 1mm.

[0011] Preferably, some of the heat dissipation fins are made of aluminum.

[0012] Preferably, the outer edges of several of the chambers near the substrate are coated with sealant.

[0013] More preferably, the open end of the U-shaped structure faces the compressor fan side; the bottom of the side plate and the two wing plates are provided with several mounting seats at equal intervals, and the height of the mounting seats is ≥30mm.

[0014] Furthermore, preferably, the sound-absorbing layer is made of one of the following materials: melamine foam, polyester fiber sound-absorbing cotton, or polypropylene spunbond nonwoven fabric.

[0015] More preferably, the flow guiding layer and the resonant layer are made of hot-dip galvanized steel.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model achieves efficient and precise absorption of wide-bandwidth, especially low-frequency peak noise: through a composite chain design of "porous sound-absorbing layer → flow-guiding slit waveguide → Helmholtz resonant layer", the noise spectrum is frequency-divided; the sound-absorbing layer effectively absorbs mid-to-high frequency noise, while the three key low-frequency noise peaks of 180Hz, 250Hz, and 350Hz unique to the compressor are precisely targeted and absorbed by a chamber with specific parameters, solving the pain point of insufficient low-frequency suppression in traditional solutions;

[0018] 2. This utility model achieves efficient noise reduction while ensuring the heat dissipation requirements of the compressor. The opening end of the U-shaped structure faces the compressor fan side. Through the open design with openings at the bottom, top and one side, a heat dissipation ventilation channel is formed between the compressor and the U-shaped structure. Combined with external heat dissipation fins, an efficient passive heat dissipation system (air convection + extended surface heat dissipation) is constructed, which effectively solves the contradiction between the noise reduction device and the compressor heat dissipation, and improves the operating reliability and service life of the compressor.

[0019] 3. This utility model has a simple and compact structure. By setting the height-to-diameter ratio of the chamber within the range of 0.55 to 0.7, it is ensured that it can be formed in one step using a medium-pressure process, resulting in a high yield and low manufacturing cost.

[0020] 4. This utility model adopts a purely passive structure, requires no additional energy consumption, has low maintenance costs, and is more energy-efficient. Attached Figure Description

[0021] The accompanying drawings constituting this utility model are provided to further understand this application and do not constitute an undue limitation on this application.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the flow-through layer;

[0024] Figure 3 This is a schematic diagram of the structure of a polypropylene plastic spacer;

[0025] Figure 4 This is a schematic diagram of the substrate structure;

[0026] Figure 5 This is a schematic diagram of the resonant layer structure;

[0027] Figure 6 This is a schematic diagram of the mounting base.

[0028] In the figure, 1-sound-absorbing layer; 2-flow guiding layer; 201-through groove; 3-polypropylene plastic block; 301-first through hole; 4-substrate; 401-second through hole; 5-resonance layer; 501-cavity; 6-heat dissipation fins; 7-mounting base. Detailed Implementation

[0029] The specific implementation of a wideband composite noise reduction structure for compressors in refrigeration equipment provided by this utility model will be further described with reference to the accompanying drawings and embodiments.

[0030] like Figure 1 As shown, a wideband composite noise reduction structure for refrigeration equipment is installed on the periphery of the compressor with a pre-reserved ventilation gap between it and the compressor. The noise reduction structure is U-shaped. It is worth noting that the open end of the U-shaped structure faces the compressor fan side.

[0031] Specifically, the noise reduction structure includes a side plate and wing plates on the left and right sides of the side plate. The side plate and the two wing plates each include a sound-absorbing layer 1, a flow-guiding layer 2 and a resonant layer 5 from the inside to the outside. The resonant layer 5 is fixed to the flow-guiding layer 2 through a substrate 4. Several polypropylene plastic spacers 3 are vertically installed between the flow-guiding layer 2 and the substrate 4. Several heat dissipation fins 6 are also evenly spaced on the side of the flow-guiding layer 2 near the compressor (the heat dissipation fins 6 are perpendicular to the flow-guiding layer 2).

[0032] like Figure 5 As shown, the surface of the resonant layer 5 is stamped using a medium-pressure process to form several matrix-distributed chambers 501 (one side of each chamber 501 faces outwards). The chambers 501 have three sizes: 50mm*30mm, 40mm*24mm, and 30mm*18mm, respectively, to address resonance noise reduction for the three key low-frequency noise levels of the compressor at 180Hz, 250Hz, and 350Hz. It is worth noting that the height-to-diameter ratio of the chambers 501 is controlled between 0.55 and 0.7 to ensure the feasibility of the stamping process and prevent deep-drawing cracking of the sheet metal.

[0033] like Figure 2 As shown, the flow guide layer 2 of the side plate and the two wing plates has several through slots 201 opened laterally. The several through slots 201 play a filtering and waveguide role for sound waves, ensuring that the mid-low frequency sound waves can be efficiently delivered to each cavity 501 of the resonant layer 5. The position of each through slot 201 corresponds to the position of one of the horizontal rows of cavities 501 in the matrix.

[0034] like Figure 3-4As shown, the installation position of each polypropylene plastic partition 3 corresponds to the position of one of the vertically arranged chambers 501 in the matrix. It is worth noting that each polypropylene plastic partition 3 has a first through hole 301 corresponding to the position of each chamber 501; each substrate 4 has a second through hole 401 corresponding to the position of the first through hole 301; the thickness of the polypropylene plastic partition is 4 mm; and the thickness of the substrate is 1 mm. The first through hole 301 and the second through hole 401 form an acoustic cavity neck with a depth of 5 mm and communicate with the inner cavity of the corresponding chamber 501.

[0035] Preferably, the sound-absorbing layer 1 is laid on the surface of the flow guiding layer 2 near the compressor and close to the sidewall of the heat dissipation fins 6. The sound-absorbing layer 1 is made of a porous material selected from melamine foam, polyester fiber sound-absorbing cotton, or polypropylene spunbond nonwoven fabric, and is mainly used to absorb most of the mid-to-high frequency components in broadband noise.

[0036] Preferably, several heat dissipation fins 6 are made of aluminum material with excellent thermal conductivity and strong corrosion resistance.

[0037] To ensure that the chambers 501 do not interfere with each other and to improve the airtightness of each chamber 501, the outer edge of several chambers 501 near the substrate 4 is coated with sealant to avoid cross-cavity problems caused by uneven contact surfaces between the substrate 4 and the resonant layer 5.

[0038] To improve the heat dissipation of the compressor through air convection, several mounting seats 7 are evenly spaced at the bottom of the side plate and the two wing plates, with a height of ≥30mm for each mounting seat 7, ensuring airflow at the bottom of the compressor. Figure 6 As shown.

[0039] More preferably, the flow guiding layer 2 and the resonance layer 5 are made of hot-dip galvanized steel sheet material that is resistant to high temperature, corrosion, and has high toughness.

[0040] The specific working principle of this utility model is as follows:

[0041] In terms of noise reduction, the noise generated by the compressor is first absorbed by the sound-absorbing layer made of porous material, which absorbs the mid-to-high frequency broadband noise directly radiated by the compressor and converts it into heat energy through friction. The remaining mid-to-low frequency broadband noise that is not completely absorbed by the inner sound-absorbing layer is guided through the channel on the guide layer and through the sound wave cavity neck to the cavity of the Helmholtz resonant layer behind. The noise that is consistent with the natural frequency of a certain cavity will cause the air column of the sound wave cavity neck to resonate violently, and consume a large amount of sound energy through friction and heat conduction effects.

[0042] In terms of heat dissipation, on the one hand, the compressor cools itself through a fan; on the other hand, cold air enters from the bottom and one side of the opening of the noise reduction structure, flows over the surface of the compressor and carries away some of the heat, and the cooled hot air is discharged from the top of the noise reduction structure to achieve air convection, while several heat dissipation fins absorb the heat energy generated by the compressor radiation, further assisting in heat dissipation.

[0043] This invention achieves efficient and precise absorption of wide-band noise, especially low-frequency peak noise, from the compressor, while resolving the contradiction between the noise reduction device and the compressor's heat dissipation, thus improving the compressor's operational reliability and service life.

[0044] In this utility model, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are merely used to facilitate the description of the structural relationships of the various components or elements of this utility model and do not specifically refer to any part or element of this utility model; they should not be construed as limiting this utility model. Terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and they should not be construed as limiting this utility model.

[0045] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A broadband composite noise reduction structure for a compressor in refrigeration equipment, used to surround the compressor and with a gap between them, characterized in that, The noise reduction structure is U-shaped and includes a side plate and wing plates on the left and right sides of the side plate; the side plate and wing plates include a sound-absorbing layer, a flow-guiding layer and a resonant layer from the inside to the outside. The resonant layer is fixed to the flow guiding layer via a substrate; A plurality of polypropylene plastic spacers are provided between the flow guide layer and the substrate; The flow guide layer also has several heat dissipation fins evenly spaced on the side near the compressor.

2. The wideband composite noise reduction structure for compressors in refrigeration equipment according to claim 1, characterized in that, The surface of the resonant layer is stamped to form several chambers arranged in a matrix; The chamber dimensions include three types: 50mm*30mm, 40mm*24mm and 30mm*18mm, which are respectively designed to reduce resonance noise for three key low-frequency noises of the compressor at 180Hz, 250Hz and 350Hz. The height-to-diameter ratio of some of the chambers ranges from 0.55 to 0.

7.

3. The wideband composite noise reduction structure for compressors in refrigeration equipment according to claim 2, characterized in that, The side plate and the two wing plates have several transverse channels in the flow guide layer; the position of each channel corresponds to the position of one of the horizontal chambers.

4. The wideband composite noise reduction structure for compressors in refrigeration equipment according to claim 2, characterized in that, The sound-absorbing layer is laid on the surface of the flow guide layer near the compressor and close to the sidewall of the heat dissipation fins.

5. The wideband composite noise reduction structure for compressors in refrigeration equipment according to claim 4, characterized in that, The installation position of each of the polypropylene plastic blocks corresponds to the position of one of the vertical chambers; Each polypropylene plastic partition has a first through hole corresponding to the position of each chamber; each substrate has a second through hole corresponding to the position of the first through hole; the first through hole and the second through hole form an acoustic cavity neck and communicate with the corresponding chamber. The thickness of the polypropylene plastic spacer is 4 mm; the thickness of the substrate is 1 mm.

6. The wideband composite noise reduction structure for compressors in refrigeration equipment according to claim 1, characterized in that, Some of the heat dissipation fins are made of aluminum.

7. The wideband composite noise reduction structure for compressors in refrigeration equipment according to claim 4, characterized in that, The outer edges of several of the chambers near the substrate are coated with sealant.

8. The wideband composite noise reduction structure for compressors in refrigeration equipment according to claim 1, characterized in that, The opening end of the U-shaped structure faces the compressor fan side; The bottom of the side plate and the two wing plates are provided with several mounting seats at equal intervals, and the height of the mounting seats is ≥30mm.

9. The wideband composite noise reduction structure for compressors in refrigeration equipment according to claim 1, characterized in that, The sound-absorbing layer is made of one of the following materials: melamine foam, polyester fiber sound-absorbing cotton, or polypropylene spunbond nonwoven fabric.

10. The wideband composite noise reduction structure for compressors in refrigeration equipment according to claim 1, characterized in that, The flow guiding layer and the resonance layer are made of hot-dip galvanized steel.

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