Noise reduction device

By designing a rotatable soundproof cover and using an automatic control mechanism, the noise pollution problem of gas boilers was solved, achieving effective noise isolation and heat dissipation, and improving the efficiency of the device.

CN224203838UActive Publication Date: 2026-05-05CHINA TOBACCO SICHUAN IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHINA TOBACCO SICHUAN IND CO LTD
Filing Date
2025-05-23
Publication Date
2026-05-05

AI Technical Summary

Technical Problem

Gas-fired boilers generate significant noise pollution during operation, and existing technologies struggle to effectively reduce this noise.

Method used

Design a soundproof enclosure that includes a rotatable soundproof cover. By switching between the closed and open states of the first and second soundproof panels, a soundproof space is formed. Combined with a drive mechanism, the state switching of the soundproof cover is automatically controlled, and sound-absorbing components are set on the soundproof panels to enhance the noise reduction effect.

Benefits of technology

It effectively isolates and reduces the noise of gas boilers, while also providing rapid heat dissipation when noise reduction is not required, thus improving the flexibility and noise reduction effect of the device.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a noise reduction device. The noise reduction device comprises a first base and a sound insulation cover. The soundproof cover is arranged on the first base. The soundproof cover comprises a first soundproof plate and a second soundproof plate. The first sound insulation plate and the second sound insulation plate are rotatably arranged on the first base, so that the sound insulation cover has an open state and a closed state. In the closed state, the first sound insulation plate and the second sound insulation plate make contact with each other and define the sound insulation space, so that the first sound insulation plate and the second sound insulation plate are closed and surround the part to be subjected to noise reduction, the first sound insulation plate and the second sound insulation plate can isolate noise generated by the part to be subjected to noise reduction, and the purpose of noise reduction is achieved. In the opening state, the first sound insulation plate is separated from the second sound insulation plate, opening of the sound insulation cover is achieved, heat generated by the part to be subjected to noise reduction can be rapidly discharged, and therefore the purpose of heat dissipation is achieved.
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Description

Technical Field

[0001] This application relates to the field of noise reduction technology, and in particular to a noise reduction device. Background Technology

[0002] A gas-fired boiler is a boiler device that uses gas as fuel. It mainly includes gas-fired hot water boilers, gas-fired hot water boilers, and gas-fired steam boilers. The fuel can be natural gas, biogas, coal gas, etc. After being converted by the boiler, it outputs steam, high-temperature water, or organic heat carriers with a certain amount of heat energy. However, gas-fired boilers generate significant noise pollution during operation. Utility Model Content

[0003] Therefore, it is necessary to provide a noise reduction device that can reduce noise pollution.

[0004] A noise reduction device, comprising:

[0005] The first base; and

[0006] A soundproof cover, comprising a first soundproof panel and a second soundproof panel, both of which are rotatably mounted on a first base, so that the soundproof cover has an open state and a closed state. In the open state, the first soundproof panel and the second soundproof panel are separated. In the closed state, the first soundproof panel and the second soundproof panel are in contact and enclosed to form a soundproof space for accommodating the noise reduction component.

[0007] In one embodiment, the first sound insulation plate and the second sound insulation plate are disposed opposite to each other; the first sound insulation plate has a first docking portion on the side away from the first base, and the second sound insulation plate has a second docking portion on the side away from the first base. The first sound insulation plate and the second sound insulation plate can rotate relative to the first base so that the first docking portion and the second docking portion come into contact or separate.

[0008] In one embodiment, the first docking portion is provided with a first limiting structure, and the second docking portion is provided with a second limiting structure. The first limiting structure and the second limiting structure cooperate to keep the soundproof cover in the closed state.

[0009] In one embodiment, one of the first limiting structure and the second limiting structure is provided with a locking block, and the other of the first limiting structure and the second limiting structure is provided with a locking groove for engaging with the locking block.

[0010] In one embodiment, the noise reduction device further includes a drive mechanism disposed on the first base and connected to the soundproof cover. The drive mechanism is used to drive the soundproof cover to switch between the open state and the closed state.

[0011] In one embodiment, the drive mechanism includes:

[0012] A first driving assembly, connected to the first sound insulation panel, is used to drive the first sound insulation panel to rotate; and

[0013] The second drive assembly is connected to the second sound insulation panel and is used to drive the second sound insulation panel to rotate.

[0014] In one embodiment, the first base is provided with a first support, and the first sound insulation plate is provided with a first connecting ear, the first support and the first connecting ear being rotatably connected; the first drive assembly includes a first motor and a first rotating shaft, the first motor is provided on the first base, the output shaft of the first motor is connected to a first worm gear, the first rotating shaft is connected to the first connecting ear, the first rotating shaft is provided with a first turbine, the first turbine and the first worm gear cooperate to drive the first sound insulation plate to rotate; and / or, the first base is provided with a second support, and the second sound insulation plate is provided with a second connecting ear, the second support and the second connecting ear being rotatably connected; the second drive assembly includes a second motor and a second rotating shaft, the second motor is provided on the first base, the output shaft of the second motor is connected to a second worm gear, the second rotating shaft is connected to the second connecting ear, the second rotating shaft is provided with a second turbine, the second turbine and the second worm gear cooperate to drive the second sound insulation plate to rotate.

[0015] In one embodiment, at least one of the first soundproof panel and the second soundproof panel is provided with a sound-absorbing element.

[0016] In one embodiment, the noise reduction device further includes a second base, which is provided with a support.

[0017] In one embodiment, a vibration damping pad is provided between the second base and the support.

[0018] In use, the noise reduction device described above involves placing the component to be noise-reduced between the first and second sound insulation panels. Then, the first and second sound insulation panels rotate relative to the first base, closing and enclosing the component to be noise-reduced. This isolates the noise generated by the component, achieving noise reduction. If noise reduction is not required, the first and second sound insulation panels rotate in opposite directions relative to the first base, separating them and opening the soundproof enclosure. This allows heat generated by the component to dissipate quickly, achieving heat dissipation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a noise reduction device according to an embodiment of this application.

[0020] Figure 2 for Figure 1 The diagram shows the structure of the noise reduction device's soundproof cover in the open state.

[0021] Figure 3 This is a schematic diagram of the structure of the first driving component of a noise reduction device according to an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the structure of the second driving component of a noise reduction device according to an embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the structure of the second base and the shock-absorbing pad of a noise reduction device according to an embodiment of this application.

[0024] Explanation of icon numbers:

[0025] 10. First base; 11. First support; 12. Second support; 13. First mounting base; 14. First upright; 15. Second mounting base; 16. Second upright; 20. Soundproof cover; 21. First soundproofing plate; 211. First docking part; 2111. Slot; 212. First connecting ear; 22. Second soundproofing plate; 221. Second docking part; 2211. Locking block; 222. Second connecting ear; 23. Soundproofing space; 24. Sound-absorbing component; 30. Drive mechanism; 31. First drive assembly; 311. First motor; 312. First rotating shaft; 313. First worm gear; 314. First turbine; 32. Second drive assembly; 321. Second motor; 322. Second rotating shaft; 323. Second worm gear; 324. Second turbine; 40. Second base; 41. Support base; 42. Vibration damping pad; 50. Boiler body. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] See Figure 1 The noise reduction device provided in one embodiment of this application includes a first base 10 and a soundproof cover 20. The soundproof cover 20 is disposed on the first base 10.

[0028] participate Figure 1 and Figure 2 The soundproof enclosure 20 includes a first soundproof panel 21 and a second soundproof panel 22. The first soundproof panel 21 and the second soundproof panel 22 are rotatably mounted on the first base 10 so that the soundproof enclosure 20 has an open state and a closed state. In the closed state, the first soundproof panel 21 and the second soundproof panel 22 are in contact and enclose a soundproof space 23. In the open state, the first soundproof panel 21 and the second soundproof panel 22 are separated.

[0029] In use, the component to be noise-reduced is placed between the first soundproofing panel 21 and the second soundproofing panel 22. Then, the first soundproofing panel 21 and the second soundproofing panel 22 rotate relative to the first base 10, causing them to close and surround the component to be noise-reduced. This isolates the noise generated by the component, thus achieving noise reduction. If noise reduction is not required, the first soundproofing panel 21 and the second soundproofing panel 22 rotate in opposite directions relative to the first base 10, separating them and opening the soundproof cover 20. This allows the heat generated by the component to be noise-reduced to dissipate quickly, achieving heat dissipation.

[0030] Optionally, the component to be noise-reduced is the boiler's burner, fan, etc. Of course, in other embodiments, the component to be noise-reduced can also be other devices, and is not limited thereto.

[0031] In one embodiment, see Figure 1 and Figure 2 The first sound insulation panel 21 and the second sound insulation panel 22 are arranged opposite to each other.

[0032] Optionally, both the first sound insulation panel 21 and the second sound insulation panel 22 are arc-shaped panels. In the closed state, the first sound insulation panel 21 and the second sound insulation panel 22 enclose a sound insulation space 23 with a semi-circular cross-section.

[0033] Further, see Figure 2The first soundproofing plate 21 has a first docking portion 211 on the side opposite to the first base 10, and the second soundproofing plate 22 has a second docking portion 221 on the side opposite to the first base 10. The first soundproofing plate 21 and the second soundproofing plate 22 can rotate relative to the first base 10 so that the first docking portion 211 and the second docking portion 221 can come into contact or separate.

[0034] It should be noted that, in the closed state, the first docking part 211 and the second docking part 221 are docked and cooperate to form a closed soundproof space 23. In the open state, the first docking part 211 and the second docking part 221 are separated.

[0035] In one embodiment, the first docking portion 211 is provided with a first limiting structure, and the second docking portion 221 is provided with a second limiting structure. The first limiting structure and the second limiting structure cooperate to keep the soundproof cover 20 in a closed state. With the cooperation of the first limiting structure and the second limiting structure, the first docking portion 211 and the second docking portion 221 remain in contact, keeping the soundproof cover 20 in a closed state, which helps to ensure the sound insulation and noise reduction effect of the soundproof cover 20.

[0036] It should be noted that by rotating the first sound insulation plate 21 and the second sound insulation plate 22, the first limiting structure can be separated from the second limiting structure.

[0037] In one embodiment, see Figure 2 One of the first and second limiting structures is provided with a locking block 2211, and the other of the first and second limiting structures is provided with a slot 2111 for engaging with the locking block 2211. In the closed state, the locking block 2211 is located in the slot 2111 and engages with the slot 2111, so that the first soundproofing plate 21 and the second soundproofing plate 22 remain in contact, improving the reliability of the soundproof cover 20 closing. By rotating the first soundproofing plate 21 and the second soundproofing plate 22, the locking block 2211 can quickly exit the slot 2111, allowing the soundproof cover 20 to switch from the closed state to the open state.

[0038] Of course, in other embodiments, the first docking part 211 is provided with a first magnetic attraction member, and the second docking part 221 is provided with a second magnetic attraction member. The first magnetic attraction member and the second magnetic attraction member magnetically engage to keep the soundproof cover 20 in a closed state.

[0039] In one embodiment, see Figure 1 and Figure 2 One of the first docking portion 211 and the second docking portion 221 is provided with multiple locking blocks 2211, and the other of the first docking portion 211 and the second docking portion 221 is provided with multiple locking slots 2111. In the closed state, the multiple locking blocks 2211 and the multiple locking slots 2111 engage in a one-to-one locking manner. In this way, the reliability of the soundproof cover 20 closing can be further improved.

[0040] In one embodiment, see Figure 2 The noise reduction device also includes a drive mechanism 30. The drive mechanism 30 is located on the first base 10 and connected to the soundproof cover 20. The drive mechanism 30 is used to drive the soundproof cover 20 to switch between an open and closed state. By setting the drive mechanism 30, the drive mechanism 30 can drive the soundproof cover 20 to open or close, allowing the soundproof cover 20 to automatically switch between open and closed states without manual opening or closing, saving manpower.

[0041] In one embodiment, see Figure 2 The drive mechanism 30 includes a first drive assembly 31 and a second drive assembly 32. The first drive assembly 31 is connected to the first sound insulation panel 21 and is used to drive the first sound insulation panel 21 to rotate. The second drive assembly 32 is connected to the second sound insulation panel 22 and is used to drive the second sound insulation panel 22 to rotate. Thus, the first drive assembly 31 and the second drive assembly 32 can provide independent power to the first sound insulation panel 21 and the second sound insulation panel 22 respectively, ensuring that the rotation of the first sound insulation panel 21 and the second sound insulation panel 22 does not interfere with each other. Furthermore, it prevents faults from propagating between the first drive assembly 31 and the second drive assembly 32, improving the stability and reliability of the drive mechanism 30.

[0042] In one embodiment, see Figure 2 and Figure 3 The first base 10 is provided with a first support 11, and the first sound insulation plate 21 is provided with a first connecting ear 212. The first support 11 and the first connecting ear 212 are rotatably connected.

[0043] Further, see Figure 2 and Figure 3 The first drive assembly 31 includes a first motor 311 and a first rotating shaft 312. The first motor 311 is mounted on the first base 10, and its output shaft is connected to a first worm gear 313. The first rotating shaft 312 is connected to a first connecting lug 212 and is equipped with a first turbine 314. The first turbine 314 engages with the first worm gear 313 to drive the first sound insulation plate 21 to rotate. In use, the first motor 311 is started, driving the first worm gear 313 to rotate. The first worm gear 313 meshes with the first turbine 314 to drive the first rotating shaft 312 to rotate, thereby driving the first sound insulation plate 21 to rotate.

[0044] Specifically, see Figure 2 and Figure 3The first base 10 is also provided with a first mounting seat 13 and a first upright 14, which are respectively located on both sides of the axial direction of the first rotating shaft 312. The first motor 311 is located on the first mounting seat 13, and the end of the first worm gear 313 facing away from the first motor 311 is connected to the first upright 14 through an adapter.

[0045] Of course, in other embodiments, the output shaft of the first motor 311 is provided with a first gear, and the first rotating shaft 312 is provided with a second gear. The first gear meshes with the second gear to drive the first rotating shaft 312 to rotate.

[0046] In one embodiment, see Figure 3 At least two first supports 11 are provided, and all first supports 11 are spaced apart along the axial direction of the first rotating shaft 312. At least two first connecting ears 212 are provided, and all first connecting ears 212 are spaced apart along the axial direction of the first rotating shaft 312. All first supports 11 and all first connecting ears 212 are rotatably connected in a one-to-one correspondence.

[0047] Further, see Figure 3 The first rotating shaft 312 is connected to all the first connecting ears 212. In use, the first rotating shaft 312 rotates around itself, which drives all the first connecting ears 212 to rotate, and in turn drives the first sound insulation plate 21 to rotate. In this way, the reliability of the rotation of the first sound insulation plate 21 can be improved.

[0048] In one embodiment, see Figure 2 and Figure 4 The first base 10 is provided with a second support 12, and the second sound insulation plate 22 is provided with a second connecting ear 222. The second support 12 and the second connecting ear 222 are rotatably connected.

[0049] Further, see Figure 2 and Figure 4 The second drive assembly 32 includes a second motor 321 and a second rotating shaft 322. The second motor 321 is mounted on the first base 10, and its output shaft is connected to a second worm gear 323. The second rotating shaft 322 is connected to a second connecting lug 222 and is equipped with a second turbine 324. The second turbine 324 engages with the second worm gear 323 to drive the second sound insulation plate 22 to rotate. In use, the second motor 321 is started, driving the second worm gear 323 to rotate. The second worm gear 323 meshes with the second turbine 324 to drive the second rotating shaft 322 to rotate, thereby driving the second sound insulation plate 22 to rotate.

[0050] Specifically, see Figure 2 and Figure 4The first base 10 is also provided with a second mounting base 15 and a second upright 16, which are respectively located on both sides of the axial direction of the second rotating shaft 322. The second motor 321 is located on the second mounting base 15, and the end of the second worm gear 323 facing away from the second motor 321 is connected to the second upright 16 through an adapter.

[0051] Of course, in other embodiments, a third gear is provided on the output shaft of the second motor 321, and a fourth gear is provided on the second rotating shaft 322. The third gear and the fourth gear mesh to drive the second rotating shaft 322 to rotate.

[0052] In one embodiment, see Figure 4 At least two second supports 12 are provided, and all second supports 12 are spaced apart along the axial direction of the second rotating shaft 322. At least two second connecting ears 222 are provided, and all second connecting ears 222 are spaced apart along the axial direction of the second rotating shaft 322. All second supports 12 and all second connecting ears 222 are rotatably connected in a one-to-one correspondence.

[0053] Further, see Figure 4 The second rotating shaft 322 is connected to all the second connecting ears 222. In use, the second rotating shaft 322 rotates around itself, which drives all the second connecting ears 222 to rotate, and in turn drives the second sound insulation plate 22 to rotate. This improves the reliability of the rotation of the second sound insulation plate 22.

[0054] In one embodiment, see Figure 1 At least one of the first sound insulation panel 21 and the second sound insulation panel 22 is provided with a sound-absorbing element 24. In this way, the sound-absorbing element 24 can absorb noise and further improve the noise reduction effect.

[0055] Optionally, the sound-absorbing component 24 can be sound-absorbing cotton, perforated metal sound-absorbing panel, perforated aluminum honeycomb sound-absorbing panel, ceramic aluminum sound-absorbing panel, etc.

[0056] In this embodiment, both the inner wall surface of the first sound insulation plate 21 and the inner wall surface of the second sound insulation plate 22 are provided with sound-absorbing elements 24.

[0057] In one embodiment, see Figure 1 The noise reduction device also includes a second base 40, which is provided with a support 41. Specifically, the second base 40 is located on the side of the first base 10. In use, the boiler body 50 is placed on the support 41, and the support 41 supports the boiler body 50.

[0058] Further, see Figure 5 A vibration isolation pad 42 is provided between the second base 40 and the support base 41. By setting the vibration isolation pad 42, the vibration isolation pad 42 can block the vibration generated during the operation of the boiler, thereby achieving the purpose of vibration reduction.

[0059] Optionally, the vibration isolation pad 42 can be a rubber pad, a silicone rubber pad, a fiberboard pad, a polyurethane pad, an EVA (ethylene-vinyl acetate copolymer) pad, etc.

[0060] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0061] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A noise reduction device, characterized in that, include: First base; as well as A soundproof cover, comprising a first soundproof panel and a second soundproof panel, both of which are rotatably mounted on a first base, so that the soundproof cover has an open state and a closed state. In the open state, the first soundproof panel and the second soundproof panel are separated. In the closed state, the first soundproof panel and the second soundproof panel are in contact and enclosed to form a soundproof space for accommodating the noise reduction component.

2. The noise reduction device according to claim 1, characterized in that, The first sound insulation plate and the second sound insulation plate are arranged opposite to each other; the first sound insulation plate has a first docking part on the side away from the first base, and the second sound insulation plate has a second docking part on the side away from the first base. The first sound insulation plate and the second sound insulation plate can rotate relative to the first base so that the first docking part and the second docking part can contact or separate.

3. The noise reduction device according to claim 2, characterized in that, The first docking part is provided with a first limiting structure, and the second docking part is provided with a second limiting structure. The first limiting structure and the second limiting structure cooperate to keep the soundproof cover in the closed state.

4. The noise reduction device according to claim 3, characterized in that, One of the first limiting structure and the second limiting structure is provided with a locking block, and the other of the first limiting structure and the second limiting structure is provided with a locking groove for engaging with the locking block.

5. The noise reduction device according to claim 1, characterized in that, The noise reduction device further includes a drive mechanism, which is located on the first base and connected to the soundproof cover. The drive mechanism is used to drive the soundproof cover to switch between the open state and the closed state.

6. The noise reduction device according to claim 5, characterized in that, The drive mechanism includes: A first driving assembly, connected to the first sound insulation panel, is used to drive the first sound insulation panel to rotate; and The second drive assembly is connected to the second sound insulation panel and is used to drive the second sound insulation panel to rotate.

7. The noise reduction device according to claim 6, characterized in that, The first base is provided with a first support, and the first sound insulation plate is provided with a first connecting ear. The first support and the first connecting ear are rotatably connected. The first drive assembly includes a first motor and a first rotating shaft. The first motor is located on the first base. The output shaft of the first motor is connected to a first worm gear. The first rotating shaft is connected to the first connecting ear. The first rotating shaft is provided with a first turbine. The first turbine and the first worm gear cooperate to drive the first sound insulation plate to rotate. And / or, the first base is provided with a second support, the second sound insulation plate is provided with a second connecting ear, the second support and the second connecting ear are rotatably connected; the second drive assembly includes a second motor and a second rotating shaft, the second motor is provided on the first base, the output shaft of the second motor is connected to a second worm gear, the second rotating shaft is connected to the second connecting ear, the second rotating shaft is provided with a second turbine, the second turbine and the second worm gear cooperate to drive the second sound insulation plate to rotate.

8. The noise reduction device according to any one of claims 1 to 7, characterized in that, At least one of the first sound insulation panel and the second sound insulation panel is provided with a sound-absorbing element.

9. The noise reduction device according to any one of claims 1 to 7, characterized in that, The noise reduction device also includes a second base, which is provided with a support.

10. The noise reduction device according to claim 9, characterized in that, A vibration isolation pad is provided between the second base and the support.