A cold storage unit with good noise reduction effect

Abstract

This utility model belongs to the technical field of refrigeration units, and in particular to a cold storage unit with good noise reduction effect. It includes a machine base, on which a condenser, oil separator, liquid receiver, gas-liquid separator, compressor, dryer filter, and pipelines are provided. The oil separator, liquid receiver, gas-liquid separator, dryer filter, and pipelines are all wrapped with a wrap-around noise reduction structure. A soundproof cover is provided on the top of the machine base, and a sound insulation layer is provided on the inner wall of the soundproof cover. At least one side of the soundproof cover has an airflow channel, and a sound-absorbing component is provided within the airflow channel. An inspection door is provided on one side of the soundproof cover. A vibration damping and noise reduction component is provided on the top of the machine base. In this utility model, through the combined design of the wrap-around noise reduction structure, the soundproof cover, the rubber pad, and the impedance composite silencer, the generation, transmission, and radiation of noise are controlled respectively, overcoming the limitations of existing single-method noise reduction technologies and significantly improving the noise reduction effect.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration unit technology, specifically relating to a cold storage unit with good noise reduction effect. Background Technology

[0002] A chiller unit (also known as a refrigeration unit, chiller, ice water unit, or cooling equipment) is a refrigeration device. In the refrigeration industry, it is divided into two types: air-cooled chiller units and water-cooled chiller units. Based on the compressor, it is further divided into screw chiller units, scroll chiller units, and centrifugal chiller units. In terms of temperature control, it is divided into low-temperature industrial chillers and normal-temperature chillers.

[0003] During operation, the noise of cold storage units mainly comes from the following aspects: First, the mechanical vibration of moving parts such as compressors, fans, and water pumps. The vibration is transmitted to the surrounding structure through the machine and connecting parts, forming structural noise. Second, the disturbance and turbulence of airflow in the duct, as well as the friction between the fan blades and the air, form airflow noise. Third, the secondary noise generated by the vibration coupling between components. If these noises are not controlled, they will not only affect the comfort of the working environment, but may also damage the hearing of operators and even interfere with the normal operation of surrounding equipment.

[0004] Currently, the most common noise reduction methods in the industry are to install a single buffer material (such as a rubber pad) at the bottom of the unit. This can only achieve limited noise reduction by weakening vibration transmission. It cannot coordinate the control of multiple sources of noise such as mechanical vibration and airflow disturbance, resulting in unsatisfactory noise reduction effect and difficulty in meeting the requirements of high noise control scenarios (such as cold storage near residential areas, cold storage supporting precision instrument workshops, etc.).

[0005] To address the aforementioned issues, this application proposes a cold storage unit with excellent noise reduction performance, which achieves significant noise reduction through a composite noise reduction structure. Utility Model Content

[0006] To address the aforementioned problems in the existing technology, this utility model provides a cold storage unit with good noise reduction effect, which solves the problem of poor noise reduction effect caused by relying on only a single buffer material in the existing technology, and realizes the coordinated control of multiple sources of noise such as mechanical vibration and airflow noise, thereby improving noise reduction efficiency.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a cold storage unit with good noise reduction effect, including a machine base, on which a condenser, an oil separator, a liquid receiver, a gas-liquid separator, a compressor, a dryer filter, and pipelines are provided. The dryer filter is connected to the water inlet of the compressor and the gas-liquid separator through pipelines. The oil separator is connected to the water outlet of the compressor and the water inlet of the condenser through pipelines. The water outlet of the condenser is connected to the liquid receiver through pipelines. The oil separator, the liquid receiver, the gas-liquid separator, the dryer filter, and the pipelines are all wrapped with a wrap-around noise reduction structure.

[0008] The top of the machine is equipped with a soundproof cover, and the inner wall of the soundproof cover is equipped with a soundproof layer.

[0009] The soundproof enclosure has an airflow channel on at least one side, a sound-absorbing component is provided in the airflow channel, and an inspection door is provided on one side of the soundproof enclosure.

[0010] The top of the machine is equipped with vibration damping and noise reduction components.

[0011] Preferably, the wrap-around noise reduction structure includes an inner sound-absorbing layer, an outer sound-insulating layer, and an installation component for mounting the wrap-around noise reduction structure.

[0012] Preferably, the sound-absorbing layer is sound-absorbing cotton, and the sound-insulating layer is a stainless steel plate.

[0013] Preferably, the installation assembly includes a first hoop and a second hoop that can be spliced ​​together, with one end of the first hoop and the second hoop hinged together and the other end connected by a locking member.

[0014] Preferably, the locking member includes a threaded rod pivotally connected to the free end of the first hoop and a wing nut threadedly connected to the threaded rod; the free end of the second hoop is provided with a limiting block, and the limiting block is provided with a limiting notch for the threaded rod to pass through.

[0015] Preferably, the sound insulation layer is a polyester fiber sound-absorbing board, which is fixed to the inner wall of the sound insulation cover by bonding or riveting.

[0016] Preferably, the silencing component is an impedance composite silencer.

[0017] Preferably, the vibration damping and noise reduction assembly includes a sound insulation felt fixed to the top of the machine base and a rubber pad fixed to the top of the sound insulation felt. Rubber pads are provided on the mounting surfaces of the condenser, the oil separator, the liquid receiver, the gas-liquid separator, the compressor, and the dryer filter.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] In this invention, the combined design of a wrap-around noise reduction structure, a soundproof cover, a rubber pad, and an impedance composite silencer controls the generation, transmission, and radiation of noise, respectively, overcoming the limitations of existing technologies that rely on a single method for noise reduction and significantly improving the noise reduction effect.

[0020] Other additional advantages and benefits of this application 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 this application. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

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

[0023] Figure 2 This is a schematic diagram of the isometric structure of the machine tool in this utility model;

[0024] Figure 3 This is an isometric structural diagram of the wrap-around noise reduction structure in this utility model;

[0025] Figure 4 This utility model Figure 3 A magnified schematic diagram of the installation components;

[0026] Figure 5 This is an isometric structural diagram of the soundproof cover of this utility model.

[0027] In the diagram: 1. Machine base; 2. Condenser; 3. Oil separator; 4. Liquid receiver; 5. Gas-liquid separator; 6. Compressor; 7. Dryer filter; 8. Wrap-up noise reduction structure; 81. Sound-absorbing cotton; 82. Stainless steel plate; 83. Mounting components; 831. First hoop; 832. Second hoop; 833. Limiting block; 8331. Limiting notch; 834. Threaded rod; 835. Wing nut; 9. Sound insulation felt; 10. Rubber pad; 11. Sound insulation cover; 12. Inspection door; 13. Impedance composite silencer. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-5 This utility model provides the following technical solution: a cold storage unit with good noise reduction effect, including a machine base 1, on which a condenser 2, an oil separator 3, a liquid receiver 4, a gas-liquid separator 5, a compressor 6, a dryer filter 7, and pipelines are provided. The dryer filter 7 is connected to the water inlet of the compressor 6 and the gas-liquid separator 5 through pipelines. The oil separator 3 is connected to the water outlet of the compressor 6 and the water inlet of the condenser 2 through pipelines. The water outlet of the condenser 2 is connected to the liquid receiver 4 through pipelines. With the above solution, when in use, the liquid receiver 4 delivers refrigerant to the dryer filter 7 through pipelines. The refrigerant after drying and filtration enters the gas-liquid separator 5. In the gas-liquid separator 5, the refrigerant completes gas-liquid separation, wherein the gaseous refrigerant is delivered to the compressor 6.

[0030] After compressor 6 starts, it compresses the gaseous refrigerant, making it a high-temperature and high-pressure gaseous refrigerant. The compressed high-temperature and high-pressure gaseous refrigerant enters the oil separator 3 through the pipeline. The oil separator 3 separates the lubricating oil mixed in with the refrigerant. The separated lubricating oil can flow back to compressor 6 for reuse, avoiding the lubricating oil from entering the subsequent pipeline and affecting the cooling effect. At the same time, this efficient separation process also reduces the noise caused by oil disturbance.

[0031] The high-temperature, high-pressure gaseous refrigerant, after oil separation, enters condenser 2. Condenser 2 exchanges heat with the external environment, causing the high-temperature, high-pressure gaseous refrigerant to condense into a medium-temperature, high-pressure liquid refrigerant. Condenser 2 uses a low-noise fan, which reduces the noise generated by airflow while ensuring heat dissipation efficiency.

[0032] The medium-temperature, high-pressure liquid refrigerant then flows into the receiver 4, which serves to store and stabilize the refrigerant flow, ensuring the stable operation of the subsequent refrigeration cycle and reducing system noise caused by refrigerant flow fluctuations.

[0033] The medium-temperature, high-pressure liquid refrigerant flowing out of the receiver 4 re-enters the dryer filter 7 to further remove moisture and impurities from the refrigerant, preventing moisture and impurities from causing ice blockage or dirt blockage in subsequent pipelines, ensuring the smooth operation of the refrigeration system, and indirectly reducing abnormal noise caused by blockage.

[0034] This cycle repeats itself, and while achieving efficient refrigeration, the entire cold storage unit also achieves significant noise reduction due to the optimized design of each component and the application of low-noise technology, maintaining a low noise level during cold storage operation.

[0035] Furthermore, by Figure 1 and Figure 3As shown, the oil separator 3, liquid receiver 4, gas-liquid separator 5, dryer filter 7, and pipelines are all wrapped with a wrap-around noise reduction structure 8. The wrap-around noise reduction structure 8 includes an inner sound-absorbing layer, an outer sound-insulating layer, and an installation component 83 for installing the wrap-around noise reduction structure 8. The sound-absorbing layer is sound-absorbing cotton 81, and the sound-insulating layer is stainless steel plate 82. After adopting the above scheme, when the cold storage unit is started and running, the refrigerant flows and changes state in the oil separator 3, liquid receiver 4, gas-liquid separator 5, dryer filter 7, and pipelines. Each component will generate a certain amount of noise due to the movement of the internal medium and its own operation. At this time, the wrap-around noise reduction structure 8 that wraps around these components plays a key role.

[0036] For the oil separator 3, slight turbulent noise is generated during the separation of refrigerant and lubricating oil inside. The sound-absorbing layer composed of sound-absorbing cotton 81 can absorb these noise waves through its porous structure and convert them into heat energy to dissipate, reducing the outward transmission of noise. The outer stainless steel plate 82, as a sound insulation layer, effectively blocks the penetration of noise that is not absorbed by the sound-absorbing layer due to its high density characteristics, forming double protection. The installation component 83 ensures that the wrap-around noise reduction structure 8 fits tightly against the surface of the oil separator 3, avoiding noise leakage due to gaps caused by loosening, and also reducing the additional noise caused by structural vibration transmission.

[0037] The storage and flow of refrigerant in the receiver 4 will generate noise from liquid sloshing and pressure fluctuations. The sound-absorbing cotton 81 can specifically absorb this type of mid-to-high frequency noise and reduce the propagation energy of the noise. The stainless steel plate 82 further isolates low-frequency noise and prevents it from being conducted to the outside through the air or structure. The stable installation of the mounting component 83 makes the noise reduction structure and the receiver 4 a whole, reducing the friction noise generated by the relative movement between the two.

[0038] The gas-liquid separation process of refrigerant in gas-liquid separator 5 is accompanied by airflow impact and separation noise. The porous structure of sound-absorbing cotton 81 has a good absorption effect on this pulse noise and can quickly attenuate noise energy. The sound barrier formed by stainless steel plate 82 prevents noise from spreading to the surrounding environment. At the same time, its smooth surface also reduces the reflection interference of external sound waves. The tight fixing of mounting component 83 avoids the vibration of gas-liquid separator 5 during operation from causing secondary noise generated by the noise reduction structure.

[0039] When the dryer filter 7 filters the refrigerant, the medium passing through the filter screen will generate a certain throttling noise. The sound-absorbing cotton 81 can efficiently absorb this high-frequency noise, while the stainless steel plate 82 blocks the noise from radiating outward. The mounting component 83 ensures that the noise reduction structure firmly wraps the dryer filter 7, so that the noise is fully absorbed and isolated inside.

[0040] The flow of refrigerant in the pipeline will generate airflow noise and vibration noise. The sound-absorbing cotton 81 is wrapped around the pipeline and can absorb the noise generated by airflow friction and pipeline vibration. The stainless steel plate 82, with its sound insulation properties, confines the noise around the pipeline. The mounting component 83 wraps and fixes the pipeline and can also reduce the displacement of the pipeline caused by vibration, thereby reducing vibration noise.

[0041] Through the inner layer of sound absorption, the outer layer of sound insulation, and the stable cooperation of the installation components 83, the enclosed noise reduction structure 8 controls the noise generated by the oil separator 3, liquid receiver 4, gas-liquid separator 5, dryer filter 7, and pipelines in multiple dimensions. It complements the low-noise design of each component of the unit, further improving the noise reduction effect of the entire cold storage unit, allowing the unit to maintain a quiet working state while operating efficiently in refrigeration.

[0042] Furthermore, by Figure 1 and Figure 5 As shown, the top of the machine 1 is equipped with a soundproof cover 11, and the inner wall of the soundproof cover 11 is equipped with a soundproof layer; at least one side of the soundproof cover 11 is equipped with an airflow channel, and a sound-absorbing component is provided in the airflow channel. One side of the soundproof cover 11 is equipped with an inspection door 12. The soundproof layer is a polyester fiber sound-absorbing board, which is fixed to the inner wall of the soundproof cover 11 by bonding or riveting. The sound-absorbing component is an impedance composite silencer 13. After adopting the above scheme, when the cold storage unit is running, the soundproof cover 11 on the top of the machine 1 will cover the main equipment such as the condenser 2 and the compressor 6, forming a relatively closed space, which will block the internal noise of the unit from spreading outward.

[0043] The polyester fiber sound-absorbing panel on the inner wall of the soundproof enclosure 11 plays an important role. Through its porous structure, it absorbs the noise generated by the various equipment inside the unit. The polyester fiber sound-absorbing panel has good sound absorption performance, which can effectively capture sound waves propagating in the air and convert sound energy into heat energy for consumption, reducing the reflection and superposition of noise inside the soundproof enclosure 11. Moreover, this sound-absorbing panel is fixed to the inner wall of the soundproof enclosure 11 by adhesive or riveting, which is firm and avoids vibration noise caused by loosening, while also ensuring the stability of the sound absorption effect.

[0044] During unit operation, the equipment needs to exchange air with the outside environment to ensure functions such as heat dissipation. The airflow channel on the soundproof enclosure 11 undertakes this task. When air enters and exits the soundproof enclosure 11 through the airflow channel, the impedance composite silencer 13 inside the channel starts to work. The impedance composite silencer 13 combines the advantages of reactive silencers and resistive silencers. It can effectively filter and silence low- and mid-frequency noise using the reactive structure, and absorb mid- and high-frequency noise through the internal sound-absorbing material. In this way, while ensuring smooth airflow, it greatly reduces the noise carried by the airflow and prevents noise from spreading outward through the airflow channel.

[0045] When it is necessary to inspect and maintain the internal equipment of the unit, the maintenance door 12 on one side of the soundproof cover 11 can be opened. The maintenance door 12 also adopts the same soundproof design as the main body of the soundproof cover 11. When closed, it can fit tightly with the soundproof cover 11 to avoid gaps that could lead to noise leakage, and ensure that the overall soundproof effect of the soundproof cover 11 is not affected.

[0046] The soundproof cover 11 works in conjunction with the wrap-around noise reduction structure 8 outside components such as the oil separator 3 and the liquid receiver 4 to form a multi-layered, all-round noise reduction system. The wrap-around noise reduction structure 8 reduces noise generation and transmission from the source of each component, while the soundproof cover 11 further blocks and absorbs noise from the overall space. In addition, the impedance composite silencer 13 in the airflow channel processes the airborne sound transmission, so that the noise of the entire cold storage unit is controlled to the maximum extent during operation, creating a quieter working environment for the cold storage, while also ensuring the normal heat dissipation and maintenance needs of the unit.

[0047] Furthermore, by Figure 1 and Figure 2 As shown, the top of the machine base 1 is equipped with a vibration damping and noise reduction component. The vibration damping and noise reduction component includes a sound insulation felt 9 fixed to the top of the machine base 1 and a rubber pad 10 fixed to the top of the sound insulation felt 9. Rubber pads 10 are provided on the mounting surfaces of the condenser 2, oil separator 3, liquid receiver 4, gas-liquid separator 5, compressor 6 and dryer filter 7. With the above solution, when the cold storage unit is started and running, each piece of equipment will inevitably vibrate during operation. The vibration damping and noise reduction component on the top of the machine base 1 can effectively alleviate the impact of these vibrations. The sound insulation felt 9 fixed to the top of the machine base 1 has good flexibility and density. When the equipment vibration is transmitted to the sound insulation felt 9 through the machine base 1, it can absorb some of the vibration energy through its own material properties, reducing the transmission of vibration to the structure below the machine base 1. At the same time, the sound insulation felt 9 can also block the solid-borne sound generated by vibration, reducing the degree of noise radiation to the outside through the machine base 1.

[0048] The rubber pads 10 installed on the top of the sound insulation felt 9 and on the mounting surfaces of the condenser 2, oil separator 3, liquid receiver 4, gas-liquid separator 5, compressor 6 and dryer filter 7 further enhance the vibration damping effect. The rubber pads 10 have excellent elasticity and cushioning performance. When the equipment vibrates during operation, the rubber pads 10 will undergo elastic deformation, converting vibration energy into elastic potential energy, thereby significantly reducing the vibration transmission between the equipment and the machine base 1.

[0049] Meanwhile, the rubber pad 10 can also reduce the friction noise caused by vibration between the equipment and the machine 1. Because its surface is relatively soft, it reduces the friction noise caused by hard contact. The combination of the sound insulation felt 9 and the rubber pad 10 forms a dual protection of "sound insulation + vibration reduction", which not only prevents the noise generated by vibration from spreading through solid conduction, but also alleviates the intensity of the equipment vibration itself.

[0050] Optionally, by Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, the installation component 83 includes a first hoop 831 and a second hoop 832 that can be spliced ​​and enclosed. One end of the first hoop 831 and the second hoop 832 are hinged, and the other end is connected by a locking member. The locking member includes a threaded rod 834 pivotally connected to the free end of the first hoop 831 and a wing nut 835 threadedly connected to the threaded rod 834. The free end of the second hoop 832 is provided with a limiting block 833, and the limiting block 833 is provided with a limiting notch 8331 for the threaded rod 834 to pass through. With the above solution, when installing the wrap-around noise reduction structure 8, the first hoop 831 and the second hoop 832 are first opened through the hinged end, and the inner layer of sound-absorbing cotton 81 is attached to the oil separator 3, the liquid reservoir 4 and other components and pipelines. Then, the outer layer of sound insulation layer is wrapped around the outside of the sound-absorbing layer. Subsequently, the first hoop 831 and the second hoop 832 are closed so that they are enclosed outside the wrap-around noise reduction structure 8.

[0051] At this point, the threaded rod 834 at the free end of the first hoop 831 is passed through the limiting notch 8331 on the limiting block 833 at the free end of the second hoop 832. The wing nut 835 is rotated to make it fit tightly with the threaded rod 834, thereby firmly locking the first hoop 831 and the second hoop 832. This ensures that the wrap-around noise reduction structure 8 fits tightly against each component and pipeline, avoiding gaps between the noise reduction structure and components due to loose installation. The installation is convenient and also easy to disassemble and maintain.

[0052] It should be noted that the electrical equipment involved in this utility model are all commercially available conventional equipment with built-in power switches. Those skilled in the art can make conventional selections according to their needs. Their working principles are common knowledge known to those skilled in the art and have been fully disclosed in the prior art, so they will not be described in detail here.

[0053] The circuit connection involved in this utility model is a common method used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. It belongs to the widely used prior art.

[0054] Components not described in detail in this article are existing technologies.

[0055] The working principle and usage process of this utility model: When the refrigeration unit of this utility model is in use, the liquid receiver 4 delivers the refrigerant to the dryer filter 7 through the pipeline. After being dried and filtered, the refrigerant enters the gas-liquid separator 5. In the gas-liquid separator 5, the refrigerant completes gas-liquid separation, and the gaseous refrigerant is delivered to the compressor 6.

[0056] After the compressor 6 starts, it compresses the gaseous refrigerant, making it a high-temperature and high-pressure gaseous refrigerant. The compressed high-temperature and high-pressure gaseous refrigerant enters the oil separator 3 through the pipeline. The oil separator 3 separates the lubricating oil mixed in the refrigerant. The separated lubricating oil can be returned to the compressor 6 for reuse, avoiding the lubricating oil from entering the subsequent pipeline and affecting the cooling effect. At the same time, this efficient separation process also reduces the noise caused by oil disturbance.

[0057] The high-temperature, high-pressure gaseous refrigerant after oil separation enters condenser 2. Condenser 2 exchanges heat with the external environment, causing the high-temperature, high-pressure gaseous refrigerant to condense into a medium-temperature, high-pressure liquid refrigerant. Condenser 2 uses a low-noise fan, which reduces the noise generated by airflow while ensuring heat dissipation efficiency.

[0058] The medium-temperature, high-pressure liquid refrigerant then flows into the receiver 4, which serves to store and stabilize the refrigerant flow, ensuring the stable operation of the subsequent refrigeration cycle and reducing system noise caused by refrigerant flow fluctuations.

[0059] The medium-temperature, high-pressure liquid refrigerant flowing out of the receiver 4 re-enters the dryer filter 7 to further remove moisture and impurities from the refrigerant, preventing moisture and impurities from causing ice blockage or dirt blockage in subsequent pipelines, ensuring the smooth operation of the refrigeration system, and indirectly reducing abnormal noise caused by blockage.

[0060] When the cold storage unit starts up, the refrigerant flows and changes state in the oil separator 3, liquid receiver 4, gas-liquid separator 5, dryer filter 7 and pipelines. Each component will generate a certain amount of noise due to the movement of the internal medium and its own operation. At this time, the enclosed noise reduction structure 8, the shock absorption and noise reduction components, the sound insulation cover 11 and the impedance composite silencer 13 work together to control the generation, transmission and radiation of noise, respectively. This solves the limitations of existing single-method noise reduction technology and significantly improves the noise reduction effect.

[0061] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cold storage unit with good noise reduction effect, comprising a machine base (1), wherein a condenser (2), an oil separator (3), a liquid receiver (4), a gas-liquid separator (5), a compressor (6), a dryer filter (7), and pipelines are provided on the machine base (1), wherein the dryer filter (7) is connected to the water inlet of the compressor (6) and the gas-liquid separator (5) through pipelines, the oil separator (3) is connected to the water outlet of the compressor (6) and the water inlet of the condenser (2) through pipelines, and the water outlet of the condenser (2) is connected to the liquid receiver (4) through pipelines, characterized in that: The oil separator (3), the liquid storage tank (4), the gas-liquid separator (5), the dryer filter (7), and the pipeline are all wrapped with a noise reduction structure (8). The machine base (1) is provided with a soundproof cover (11) on the top, and the inner wall of the soundproof cover (11) is provided with a soundproof layer; The soundproof cover (11) has an airflow channel on at least one side, and a sound-absorbing component is provided in the airflow channel. The soundproof cover (11) has an inspection door (12) on one side. The top of the machine tool (1) is equipped with a shock absorption and noise reduction component.

2. The cold storage unit with good noise reduction effect according to claim 1, characterized in that: The enclosed noise reduction structure (8) includes an inner sound-absorbing layer, an outer sound-insulating layer, and an installation assembly (83) for installing the enclosed noise reduction structure (8).

3. The cold storage unit with good noise reduction effect according to claim 2, characterized in that: The sound-absorbing layer is sound-absorbing cotton (81), and the sound insulation layer is stainless steel plate (82).

4. The cold storage unit with good noise reduction effect according to claim 2, characterized in that: The installation assembly (83) includes a first hoop (831) and a second hoop (832) that can be spliced ​​together, with one end of the first hoop (831) and the second hoop (832) hinged together and the other end connected by a locking member.

5. A cold storage unit with good noise reduction effect according to claim 4, characterized in that: The locking component includes a threaded rod (834) pivotally connected to the free end of the first hoop (831) and a wing nut (835) threadedly connected to the threaded rod (834); the free end of the second hoop (832) is provided with a limiting block (833), and the limiting block (833) is provided with a limiting notch (8331) for the threaded rod (834) to pass through.

6. The cold storage unit with good noise reduction effect according to claim 1, characterized in that: The sound insulation layer is a polyester fiber sound-absorbing board, which is fixed to the inner wall of the sound insulation cover (11) by bonding or riveting.

7. A cold storage unit with good noise reduction effect according to claim 1, characterized in that: The silencing component is an impedance composite silencer (13).

8. A cold storage unit with good noise reduction effect according to claim 1, characterized in that: The vibration damping and noise reduction assembly includes a sound insulation felt (9) fixed to the top of the machine base (1) and a rubber pad (10) fixed to the top of the sound insulation felt (9). The mounting surfaces of the condenser (2), the oil separator (3), the liquid receiver (4), the gas-liquid separator (5), the compressor (6), and the dryer filter (7) are all provided with rubber pads (10).

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