Noise reduction device and air conditioner

Abstract

The invention provides a noise reduction device and an air conditioner, and relates to the technical field of financial science and technology, the noise reduction device comprises a shell used for defining a containing cavity together with a mounting base plane, and the containing cavity is used for containing a condenser; a sound absorption layer is arranged in at least part of the shell, sound absorption holes are formed in the inner wall face of the shell, and the sound absorption holes communicate with the containing cavity and the sound absorption layer at the same time; at least part of the outer wall surface of the shell is provided with an air inlet hole, at least part of the inner wall surface of the shell is provided with an air outlet hole, the air outlet hole is communicated with the accommodating cavity, and a variable-diameter circulation channel is arranged between the air inlet hole and the air outlet hole; and in the thickness direction of the shell, the circulation inner diameter of the variable-diameter circulation channel is gradually reduced in the direction from the air inlet hole to the exhaust hole. The problem that noise generated by a condenser in the prior art is large is solved.

Description

Technical Field

[0001] This application relates to the field of financial technology, and more specifically, to a noise reduction device and an air conditioner. Background Technology

[0002] Data centers of banks and financial institutions are mostly located in densely populated commercial areas. The air conditioners that cool these data centers are constantly running. Since the condensers of these air conditioners release the heat of the refrigerant through convective heat exchange with the surrounding air, the condenser fans rotate to accelerate airflow and promote heat exchange. However, the rotation of the condenser fans generates considerable noise, which can seriously affect the health of workers near the condensers.

[0003] There is currently no effective solution to the problem of excessive noise generated by condensers in related technologies. Summary of the Invention

[0004] The main objective of this invention is to provide a noise reduction device and an air conditioner to solve the problem of excessive noise generated by the condenser in related technologies.

[0005] To achieve the above objectives, according to a first aspect of the present invention, a noise reduction device is provided, applicable to the condenser of an air conditioner. The noise reduction device includes: a housing for forming a receiving cavity together with a mounting base, the receiving cavity for accommodating the condenser; a sound-absorbing layer is provided in at least a portion of the housing, and sound-absorbing holes are provided on the inner wall surface of the housing, the sound-absorbing holes communicating with both the receiving cavity and the sound-absorbing layer; an air inlet is provided on at least a portion of the outer wall surface of the housing, and an exhaust hole is provided on at least a portion of the inner wall surface of the housing, the exhaust hole communicating with the receiving cavity; a variable-diameter flow channel is provided between the air inlet and the exhaust hole; along the thickness direction of the housing, from the air inlet to the exhaust hole, the inner diameter of the variable-diameter flow channel gradually decreases.

[0006] Furthermore, the variable diameter flow channel includes a first channel section and a second channel section. One end of the first channel section is connected to the air inlet, and one end of the second channel section is connected to the exhaust port. The other ends of the first channel section and the other ends of the second channel section are connected to each other. The inner diameter of the first channel section is larger than the inner diameter of the second channel section.

[0007] Furthermore, the noise reduction device also includes a sound-absorbing structure, which is installed inside the housing. The inlet and outlet of the sound-absorbing structure are connected, and the outlet of the sound-absorbing structure is connected to the sound-absorbing layer. The sound-absorbing structure is used to change the path of the sound waves passing through it so that the sound waves are discharged from the outlet of the sound-absorbing structure after undergoing multiple reflections.

[0008] Furthermore, the sound-absorbing structure is a balloon structure.

[0009] Furthermore, the noise reduction device also includes a spraying component, which includes a spray pipe and a spraying element. The spraying element has multiple spray holes, each of which is connected to the spray pipe and is oriented towards the condenser so that the cooling liquid in the spray pipe flows through the spray holes and is sprayed onto the condenser.

[0010] Furthermore, the spraying component also includes a control valve, which is installed on the spray pipe and its opening is adjustable to regulate the flow rate of the cooling liquid flowing into the spraying component.

[0011] Furthermore, the housing includes two first plates and two second plates. The two first plates are arranged opposite each other along the length direction of the condenser, and the two second plates are arranged opposite each other along the width direction of the condenser. The two ends of each second plate are respectively connected to the two first plates. Each first plate and each second plate extends along the height direction of the condenser.

[0012] Furthermore, the housing also includes two third plates, which are arranged one-to-one with the two second plates. One end of each third plate is connected to the top of the corresponding second plate, and each third plate is tilted at a first preset angle relative to the corresponding second plate so that the other ends of the two third plates are connected to each other.

[0013] Furthermore, the housing also includes two fourth plates and two guide plates. The two guide plates are arranged one-to-one with the two second plates. One end of each guide plate is connected to the bottom of the corresponding second plate. Each guide plate is inclined at a second preset angle relative to the corresponding second plate. The two fourth plates and the two guide plates are arranged one-to-one. The fourth plates are set on the mounting base and located below the corresponding guide plates. The other end of each guide plate forms an air outlet gap with the corresponding fourth plate. The air outlet gap is connected to the receiving cavity. A variable diameter flow channel is provided inside the fourth plate.

[0014] According to a second aspect of the present invention, an air conditioner is provided, including the noise reduction device described above, and the air conditioner further includes a condenser.

[0015] According to the technical solution of this invention, the noise reduction device includes a housing, with a sound-absorbing layer disposed in at least a portion of the housing. Sound-absorbing holes are disposed on the inner wall surface of the housing, and these holes are simultaneously connected to the receiving cavity and the sound-absorbing layer. This allows the housing and the mounting base to form a closed or semi-closed receiving cavity, effectively isolating most of the noise generated during condenser operation within the cavity and preventing it from directly propagating to the external environment. When the noise generated by the condenser in the receiving cavity passes through the sound-absorbing holes and enters the sound-absorbing layer, it undergoes multiple reflections and vibrations. Utilizing the sound-absorbing properties of the sound-absorbing layer, noise energy is consumed to significantly reduce noise intensity, effectively preventing noise from propagating to the external environment. The large size of the condenser solves the problem of excessive noise generated by the condenser in related technologies. At least a portion of the outer wall of the shell is provided with an air inlet, and at least a portion of the inner wall of the shell is provided with an exhaust outlet. The exhaust outlet is connected to the receiving cavity, and a variable diameter flow channel is provided between the air inlet and the exhaust outlet. Along the thickness direction of the shell, from the air inlet to the exhaust outlet, the inner diameter of the variable diameter flow channel gradually decreases, causing the airflow to gradually increase in speed when passing through the variable diameter flow channel. This results in a decrease in the temperature of the airflow entering the receiving cavity from the exhaust outlet, which helps to increase the temperature difference between the condenser and the surrounding air, and helps to remove heat from the surface of the condenser, thereby improving the heat exchange efficiency. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A structural schematic diagram of the noise reduction device (including only a first plate) and the condenser at the first angle according to the present invention is shown;

[0018] Figure 2 A schematic diagram of the variable diameter flow channel of the noise reduction device according to the present invention is shown;

[0019] Figure 3 A schematic diagram of the sound-absorbing structure of the noise reduction device according to the present invention is shown;

[0020] Figure 4 A structural schematic diagram of the noise reduction device (comprising only a first plate) and the condenser from a second angle according to the present invention is shown.

[0021] The above figures include the following reference numerals:

[0022] 10. Shell; 2. Condenser; 3. Sound-absorbing hole; 20. Air inlet; 21. Exhaust hole; 30. Variable diameter flow channel; 31. First channel section; 32. Second channel section; 40. Sound-absorbing structure; 50. Injection pipe; 51. Spraying component; 52. Control valve; 11. First plate; 12. Second plate; 13. Third plate; 14. Fourth plate; 15. Guide plate; 4. Air outlet gap; 6. Sound-absorbing layer. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed in the invention, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] Please refer to Figures 1 to 4 This invention provides a noise reduction device suitable for the condenser 2 of an air conditioner. The noise reduction device includes: a housing 10, which together with the mounting base forms a receiving cavity for accommodating the condenser 2; a sound-absorbing layer 6 is provided in at least a portion of the housing 10, and sound-absorbing holes 3 are provided on the inner wall surface of the housing 10, which are connected to both the receiving cavity and the sound-absorbing layer 6; an air inlet 20 is provided on at least a portion of the outer wall surface of the housing 10, and an exhaust hole 21 is provided on at least a portion of the inner wall surface of the housing 10, which is connected to the receiving cavity; a variable diameter flow channel 30 is provided between the air inlet 20 and the exhaust hole 21; along the thickness direction of the housing 10, from the air inlet 20 to the exhaust hole 21, the inner diameter of the variable diameter flow channel 30 gradually decreases.

[0027] The noise reduction device of the present invention includes a housing 10, in which at least a sound-absorbing layer 6 is disposed. Sound-absorbing holes 3 are disposed on the inner wall surface of the housing 10, and the sound-absorbing holes 3 are simultaneously connected to the receiving cavity and the sound-absorbing layer 6. This forms a closed or semi-closed receiving cavity between the housing 10 and the mounting base, effectively isolating most of the noise generated during the operation of the condenser 2 within the cavity and preventing it from directly propagating to the external environment. When the noise generated by the condenser 2 in the receiving cavity passes through the sound-absorbing holes 3 and enters the sound-absorbing layer 6, it undergoes multiple reflections and vibrations. Utilizing the sound-absorbing characteristics of the sound-absorbing layer 6, the noise energy is consumed to significantly reduce the noise intensity, effectively preventing the noise from propagating to the external environment. This solves the problem of excessive noise in related technologies. The problem of excessive noise generated by the condenser during operation; an air inlet 20 is provided on at least part of the outer wall surface of the housing 10, and an exhaust port 21 is provided on at least part of the inner wall surface of the housing 10. The exhaust port 21 is connected to the receiving cavity. A variable diameter flow channel 30 is provided between the air inlet 20 and the exhaust port 21. Along the thickness direction of the housing 10, from the air inlet 20 to the exhaust port 21, the inner diameter of the variable diameter flow channel 30 gradually decreases, causing the airflow to gradually increase in speed when passing through the variable diameter flow channel 30. This results in a decrease in the temperature of the airflow entering the receiving cavity from the exhaust port 21, which helps to increase the temperature difference between the condenser 2 and the surrounding air, and helps to remove heat from the surface of the condenser 2, thereby improving the heat exchange efficiency.

[0028] Alternatively, the sound-absorbing layer 6 may be made of sound-absorbing materials such as mineral wool board, glass fiber, and polyester fiber.

[0029] It should be noted that the storage rack disclosed herein can be used in the field of financial technology technology, or in any field other than financial technology technology technology. The application field of the storage rack disclosed herein is not limited.

[0030] In this embodiment, the variable diameter flow channel 30 includes a first channel section 31 and a second channel section 32. One end of the first channel section 31 is connected to the air inlet 20, and one end of the second channel section 32 is connected to the exhaust port 21. The other ends of the first channel section 31 and the second channel section 32 are connected to each other. The inner diameter of the first channel section 31 is larger than the inner diameter of the second channel section 32.

[0031] Specifically, the flow inner diameter of the first channel section 31 is designed to be larger than that of the second channel section 32, which causes the air entering from the air inlet 20 to flow at a relatively slow speed in the first channel section 31. However, when the air transitions from the first channel section 31 to the second channel section 32, the airflow speed increases significantly due to the sudden reduction in the flow inner diameter, forming a speed gradient from slow to fast. This causes the temperature of the airflow flowing through the second channel section 32 to decrease, which is beneficial for increasing the temperature difference during the heat exchange process, enhancing the heat dissipation capacity of the condenser 2, and thus improving the heat exchange efficiency.

[0032] In this embodiment, the noise reduction device further includes a sound-absorbing structure 40, which is disposed inside the housing 10. The inlet of the sound-absorbing structure 40 is connected to the sound-absorbing hole 3, and the outlet of the sound-absorbing structure 40 is connected to the sound-absorbing layer 6. The sound-absorbing structure 40 is used to change the path of the sound waves passing through it so that the sound waves are discharged from the outlet of the sound-absorbing structure 40 after undergoing multiple reflections.

[0033] In this embodiment, the sound-absorbing structure 40 is a balloon structure.

[0034] Specifically, the internal geometry of the spherical structure provides a tortuous propagation path for sound waves. After entering the spherical structure, the sound waves collide and reflect multiple times with the walls. Each collision converts some sound energy into heat energy, gradually attenuating the sound wave intensity. The remaining sound waves are further absorbed by the sound-absorbing layer 6, increasing the chances of the sound waves passing through the sound-absorbing material and improving the efficiency of the sound-absorbing layer 6. Simultaneously, the specific size and shape of the spherical structure can selectively attenuate sound waves within a certain frequency range. This is because when sound waves encounter obstacles of a specific size or reflect within a specific volume of space, certain frequencies of sound waves are more effectively absorbed due to interference. During the operation of the air conditioner condenser, this frequency-selective attenuation is particularly effective against high-frequency, sharp noises, effectively reducing the acoustic impact of the condenser on the surrounding environment. Therefore, the sound-absorbing structure 40, located within the housing 10, effectively reduces the noise level of the air conditioner condenser during operation through a complex reflection path and frequency-selective attenuation technology. This design not only improves the sound absorption efficiency of the sound-absorbing layer 6 but also optimizes for high-frequency, sharp noises, effectively preventing excessive noise from propagating to the external environment.

[0035] In this embodiment, the noise reduction device also includes a spraying component, which includes a spray pipe 50 and a spraying element 51. The spraying element 51 has multiple spray holes, each of which is connected to the spray pipe 50 and is arranged facing the condenser 2 so that the cooling liquid in the spray pipe 50 flows through the spray holes and is sprayed onto the condenser 2.

[0036] Specifically, cooling liquid is sprayed directly onto the condenser surface via the spray nozzle 51, accelerating heat conduction and dissipation, thereby improving the condenser's heat dissipation efficiency and indirectly reducing noise increases caused by insufficient heat dissipation. Specifically, when the cooling liquid is sprayed onto the metal fins of the condenser 2 through the spray nozzle, it quickly covers and penetrates the fin surface, absorbing heat from the condenser 2 through direct contact. The cooling liquid is at a low temperature, thus quickly carrying away heat from the metal fins and accelerating heat dissipation. This process improves the heat exchange efficiency of the condenser 2, reducing the need for the condenser fan to operate for longer periods or at higher power due to poor heat dissipation, thereby reducing noise generated by the condenser 2 during high-speed operation.

[0037] Specifically, the spraying component 51 can achieve an umbrella-shaped spraying effect. The sprayed water is uniformly attached to the metal fins of the condenser in the form of water mist. Since the temperature of the metal fins is 70-80 degrees Celsius, the water mist vaporizes instantly, directly transferring the heat of the condenser to the air and quickly completing the heat transfer.

[0038] Optionally, the cooling liquid is water.

[0039] In this embodiment, the spraying component also includes a control valve 52, which is disposed on the spray pipe 50. The opening degree of the control valve 52 is adjustable to regulate the flow rate of the cooling liquid flowing into the spraying component 51.

[0040] Specifically, by adjusting the opening of control valve 52, the supply of cooling liquid can be flexibly adjusted according to the ambient temperature, air conditioning load, or demand during a specific period.

[0041] Optionally, the control valve 52 is a solenoid valve that is connected in communication with the fan of the condenser. When the fan increases its operating frequency, the control valve 52 opens, controlling the cooling liquid in the spray pipe 50 to flow through the spray hole and spray onto the condenser 2, which greatly reduces the fan running time and thus reduces noise generation.

[0042] In this embodiment, the housing 10 includes two first plates 11 and two second plates 12. The two first plates 11 are arranged opposite each other along the length direction of the condenser 2, and the two second plates 12 are arranged opposite each other along the width direction of the condenser 2. The two ends of each second plate 12 are respectively connected to the two first plates 11. Each first plate 11 and each second plate 12 extends along the height direction of the condenser 2.

[0043] Specifically, the combination of the first plate 11 and the second plate 12 can effectively block and absorb noise emitted from the condenser 2. This structural design causes sound waves to undergo multiple reflections and absorptions within the housing 10, significantly reducing the intensity of sound waves propagating directly to the outside, thereby mitigating the acoustic impact of the air conditioner operation on the surrounding environment.

[0044] In this embodiment, the housing 10 further includes two third plates 13, which are arranged in a one-to-one correspondence with the two second plates 12. One end of each third plate 13 is connected to the top of the corresponding second plate 12, and each third plate 13 is tilted at a first preset angle relative to the corresponding second plate 12 so that the other ends of the two third plates 13 are connected to each other.

[0045] Specifically, each third plate 13 is tilted at a first preset angle relative to the corresponding second plate 12, so that the other ends of the two third plates 13 are connected to each other. This allows the third plates 13 to shield the condenser 2 from above, thereby blocking direct sunlight in summer and preventing damage to the condenser due to high-temperature expansion. In winter, it insulates the condenser 2, ensuring that the cavity has a relatively stable temperature that is slightly higher than the outdoor temperature. It also helps rainwater to slide off naturally during rain, preventing rainwater from accumulating on the third plates 13 and reducing moisture erosion of the condenser. At the same time, the combination of the first plate 11, the second plate 12, and the third plate 13 increases the sound absorption area of ​​the sound-absorbing layer 6, further effectively blocking and absorbing noise emitted from the condenser 2.

[0046] Specifically, each of the first plate 11, each of the second plate 12, and each of the third plate 13 is provided with a sound-absorbing layer 6.

[0047] In this embodiment, the housing 10 further includes two fourth plates 14 and two guide plates 15. The two guide plates 15 are arranged in a one-to-one correspondence with the two second plates 12. One end of each guide plate 15 is connected to the bottom of the corresponding second plate 12, and each guide plate 15 is inclined at a second preset angle relative to the corresponding second plate 12. The two fourth plates 14 and the two guide plates 15 are arranged in a one-to-one correspondence. The fourth plates 14 are arranged on the mounting base and located below the corresponding guide plates 15. The other end of each guide plate 15 forms an air outlet gap 4 with the corresponding fourth plate 14, and the air outlet gap is connected to the receiving cavity. The fourth plate 14 is provided with a variable diameter flow channel 30.

[0048] Specifically, the guide plate 15 is connected to the second plate 12 and tilted at a second preset angle, its function being to guide and optimize the airflow direction. By adjusting the tilt angle of the guide plate, the airflow direction can be effectively controlled, allowing it to be discharged more smoothly from the outlet gap 4 to the outside. The fourth plate 14, by setting a variable diameter flow channel 30 inside, allows the outside airflow to enter the receiving cavity through the air inlet 20, the variable diameter flow channel 30, and the exhaust port 21, which lowers the temperature of the airflow, helps to increase the temperature difference between the condenser 2 and the surrounding air, helps to remove heat from the surface of the condenser 2, and improves the heat exchange efficiency.

[0049] This invention also provides an air conditioner including the aforementioned noise reduction device, further comprising a condenser 2. The noise reduction device includes a housing 10, with a sound-absorbing layer 6 disposed within at least a portion of the housing 10. Sound-absorbing holes 3 are provided on the inner wall surface of the housing 10, communicating with both the receiving cavity and the sound-absorbing layer 6. This forms a closed or semi-closed receiving cavity between the housing 10 and the mounting base, effectively isolating most of the noise generated by the condenser 2 during operation within the cavity and preventing its direct transmission to the external environment. When the noise generated by the condenser 2 within the receiving cavity passes through the sound-absorbing holes 3 and enters the sound-absorbing layer 6, it undergoes multiple reflections and vibrations. Utilizing the sound-absorbing characteristics of the sound-absorbing layer 6, noise energy is consumed to significantly reduce noise intensity, effectively preventing excessive noise from propagating to the external environment, thus solving the problem in related technologies. The condenser generates significant noise. An air inlet 20 is provided on at least a portion of the outer wall of the housing 10, and an exhaust 21 is provided on at least a portion of the inner wall of the housing 10. The exhaust 21 is connected to the receiving cavity. A variable-diameter flow channel 30 is provided between the air inlet 20 and the exhaust 21. Along the thickness direction of the housing 10, from the air inlet 20 to the exhaust 21, the inner diameter of the variable-diameter flow channel 30 gradually decreases, causing the airflow to gradually accelerate as it passes through the variable-diameter flow channel 30. This lowers the temperature of the airflow entering the receiving cavity from the exhaust 21, which helps increase the temperature difference between the condenser 2 and the surrounding air, facilitates the removal of heat from the surface of the condenser 2, and improves heat exchange efficiency.

[0050] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0051] The noise reduction device of the present invention includes a housing 10, in which at least a sound-absorbing layer 6 is disposed. Sound-absorbing holes 3 are disposed on the inner wall surface of the housing 10, and the sound-absorbing holes 3 are simultaneously connected to the receiving cavity and the sound-absorbing layer 6. This forms a closed or semi-closed receiving cavity between the housing 10 and the mounting base, effectively isolating most of the noise generated during the operation of the condenser 2 within the cavity and preventing it from directly propagating to the external environment. When the noise generated by the condenser 2 in the receiving cavity passes through the sound-absorbing holes 3 and enters the sound-absorbing layer 6, it undergoes multiple reflections and vibrations. Utilizing the sound-absorbing characteristics of the sound-absorbing layer 6, the noise energy is consumed to significantly reduce the noise intensity, effectively preventing the noise from propagating to the external environment. This solves the problem of excessive noise in related technologies. The problem of excessive noise generated by the condenser during operation; an air inlet 20 is provided on at least part of the outer wall surface of the housing 10, and an exhaust port 21 is provided on at least part of the inner wall surface of the housing 10. The exhaust port 21 is connected to the receiving cavity. A variable diameter flow channel 30 is provided between the air inlet 20 and the exhaust port 21. Along the thickness direction of the housing 10, from the air inlet 20 to the exhaust port 21, the inner diameter of the variable diameter flow channel 30 gradually decreases, causing the airflow to gradually increase in speed when passing through the variable diameter flow channel 30. This results in a decrease in the temperature of the airflow entering the receiving cavity from the exhaust port 21, which helps to increase the temperature difference between the condenser 2 and the surrounding air, and helps to remove heat from the surface of the condenser 2, thereby improving the heat exchange efficiency.

[0052] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0053] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0054] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A noise reduction device suitable for the condenser (2) of an air conditioner, characterized in that, The noise reduction device includes: A housing (10) is used to form a receiving cavity together with the mounting base surface, the receiving cavity being used to receive the condenser (2); at least a portion of the housing (10) is provided with a sound-absorbing layer (6), and a sound-absorbing hole (3) is provided on the inner wall surface of the housing (10), the sound-absorbing hole (3) being connected to both the receiving cavity and the sound-absorbing layer (6); An air inlet (20) is provided on at least a portion of the outer wall surface of the housing (10), and an exhaust hole (21) is provided on at least a portion of the inner wall surface of the housing (10). The exhaust hole (21) is connected to the receiving cavity. A variable diameter flow channel (30) is provided between the air inlet (20) and the exhaust hole (21). Along the thickness direction of the housing (10), from the air inlet (20) to the exhaust hole (21), the inner diameter of the variable diameter flow channel (30) gradually decreases.

2. The noise reduction device according to claim 1, characterized in that, The variable diameter flow channel (30) includes a first channel section (31) and a second channel section (32). One end of the first channel section (31) is connected to the air inlet (20), and one end of the second channel section (32) is connected to the exhaust port (21). The other ends of the first channel section (31) and the other ends of the second channel section (32) are interconnected. The inner diameter of the first channel section (31) is larger than the inner diameter of the second channel section (32).

3. The noise reduction device according to claim 1, characterized in that, The noise reduction device further includes a sound-absorbing structure (40), which is disposed inside the housing (10). The inlet of the sound-absorbing structure (40) is connected to the sound-absorbing hole (3), and the outlet of the sound-absorbing structure (40) is connected to the sound-absorbing layer (6). The sound-absorbing structure (40) is used to change the path of the sound waves passing through it so that the sound waves are discharged from the outlet of the sound-absorbing structure (40) after undergoing multiple reflections.

4. The noise reduction device according to claim 3, characterized in that, The sound-absorbing structure (40) is a balloon structure.

5. The noise reduction device according to claim 1, characterized in that, The noise reduction device also includes a spraying component, which includes a spray pipe (50) and a spraying element (51). The spraying element (51) has multiple spray holes, each of which is connected to the spray pipe (50) and is oriented toward the condenser (2) so that the cooling liquid in the spray pipe (50) flows through the spray holes and is sprayed onto the condenser (2).

6. The noise reduction device according to claim 5, characterized in that, The spraying component also includes a control valve (52), which is disposed on the spray pipe (50). The opening of the control valve (52) is adjustable to regulate the flow rate of the cooling liquid flowing into the spraying component (51).

7. The noise reduction device according to claim 1, characterized in that, The housing (10) includes two first plates (11) and two second plates (12). The two first plates (11) are arranged opposite each other along the length direction of the condenser (2), and the two second plates (12) are arranged opposite each other along the width direction of the condenser (2). The two ends of each second plate (12) are respectively connected to the two first plates (11). Each first plate (11) and each second plate (12) extends along the height direction of the condenser (2).

8. The noise reduction device according to claim 7, characterized in that, The housing (10) further includes two third plates (13), which are arranged in a one-to-one correspondence with the two second plates (12). One end of each third plate (13) is connected to the top of the corresponding second plate (12), and each third plate (13) is tilted at a first preset angle relative to the corresponding second plate (12) so that the other ends of the two third plates (13) are connected to each other.

9. The noise reduction device according to claim 7, characterized in that, The housing (10) further includes two fourth plates (14) and two guide plates (15). The two guide plates (15) are arranged in a one-to-one correspondence with the two second plates (12). One end of each guide plate (15) is connected to the bottom of the corresponding second plate (12). Each guide plate (15) is inclined at a second preset angle relative to the corresponding second plate (12). The two fourth plates (14) and the two guide plates (15) are arranged in a one-to-one correspondence. The fourth plate (14) is arranged on the mounting base and located below the corresponding guide plate (15). The other end of each guide plate (15) forms an air outlet gap (4) with the corresponding fourth plate (14). The air outlet gap (4) is connected to the receiving cavity. The variable diameter flow channel (30) is provided inside the fourth plate (14).

10. An air conditioner, characterized in that, The air conditioner includes the noise reduction device according to any one of claims 1 to 9, and further includes a condenser (2).

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