An exhaust noise reduction box for a generator set

Abstract

The utility model relates to a kind of exhaust noise reduction box for generator set, including the box body enclosed by bottom plate, top plate and two side plates, the both ends of the box body are connected respectively with the container of louvre and generator set;Noisy piece is installed in the box body.Utilize a kind of exhaust noise reduction box for generator set designed in the utility model, can solve the exhaust side of container type generator set in the operation process, bear high-temperature hot gas and airflow pulsation and discharge task, usually set up silencer / noise reduction component in exhaust end, for example, commonly used straight-through type noise reduction piece, but the structure airflow path is single, to low frequency and weak blade tip through frequency, and bypass leakage passage is easily formed when wind pressure is suddenly changed, difficult to meet the full needs of container type generator set, and high-temperature hot gas borne by exhaust side is prone to cause equipment failure, bring the problem of security risk.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically to an exhaust noise reduction box for generator sets. Background Technology

[0002] During operation, the exhaust side of a containerized generator set is responsible for expelling high-temperature hot air and airflow pulsations. Silencing / noise reduction components, such as commonly used straight-through silencers, are typically installed at the exhaust end. However, this structure has a single airflow path, is weak for low- and medium-frequency frequencies and blade tip frequencies, and is prone to forming bypass leakage channels when wind pressure changes abruptly. This makes it difficult to meet all the requirements of the containerized generator set. Furthermore, the high-temperature hot air on the exhaust side can easily cause equipment failure and pose safety hazards.

[0003] Therefore, existing technologies have shortcomings and need to be improved and developed. Utility Model Content

[0004] This utility model provides an exhaust noise reduction box for generator sets, which addresses the issue of high-temperature hot air and airflow pulsation on the exhaust side of containerized generator sets during operation. Typically, a noise reduction / silencing component, such as a commonly used straight-through silencer, is installed at the exhaust end. However, this structure has a single airflow path, is weak for low-frequency and blade tip passage frequencies, and is prone to forming bypass leakage channels when wind pressure changes abruptly. It is difficult to meet all the requirements of containerized generator sets, and the high-temperature hot air on the exhaust side can easily cause equipment failure, leading to safety hazards.

[0005] This utility model embodiment provides an exhaust noise reduction box for a generator set, including a box body formed by a bottom plate, a top plate and two side plates. The box body is open at both ends, and a louver is detachably connected to one end of the box body. The other end of the box body faces the generator set.

[0006] The inner surface of the base plate is detachably connected to the two ends near the louvers and the generator set with first bending plates. The first bending plate includes a first bending portion with a threaded hole and detachably connected to the base plate by a first bolt, and a second bending portion perpendicular to the first bending portion. A plurality of second bending plates are detachably connected between the two first bending plates. The second bending plate includes a third bending portion with a threaded hole and detachably connected to the base plate by a second bolt, and a fourth bending portion perpendicular to both ends of the third bending portion. The inner surface of the top plate is vertically aligned with the base plate with the first bending plates and the second bending plates. Noise reduction sheets are engaged between the second bending portion and the fourth bending portion, and between two adjacent fourth bending portions in adjacent second bending plates.

[0007] Furthermore, the top plate, the bottom plate, and the side plates are all rectangular plates, and lifting corner pieces are fixed on the two corners of the top plate near the louvers, the two corners of the bottom plate near the louvers, the two corners of the top plate near the generator set, and the two corners of the bottom plate near the generator set.

[0008] Furthermore, a third bending plate is welded to both the lifting angle brackets of the top plate and the bottom plate near the generator set. The third bending plate has a fifth bending portion perpendicular to the bottom plate, and the fifth bending portion has a threaded hole for detachably connecting to the container where the generator set is located.

[0009] Furthermore, an EPDM pad is attached to the side of the fifth bend facing the generator set.

[0010] Furthermore, the base plate is defined to have N columns of noise reduction sheet groups from near the louvers to near the generator set, where N is a positive integer not exceeding 4. The noise reduction sheets in each column of the noise reduction sheet group are parallel to each other. A set of limiting members is arranged between adjacent noise reduction sheets in each column of the noise reduction sheet group. Each set of limiting members includes two fourth bending plates that are vertically aligned and respectively installed on the base plate and the top plate. The fourth bending plate includes a sixth bending portion with threaded holes and detachably connected to the base plate or the top plate by a third bolt. It also includes a seventh bending portion that is perpendicular to both ends of the sixth bending portion. The two seventh bending portions are respectively attached to the adjacent noise reduction sheets in each column of the noise reduction sheet group.

[0011] Furthermore, the noise reduction sheet has a hexagonal outer frame, and the interior of the outer frame is filled with fireproof and sound-absorbing cotton.

[0012] Furthermore, the noise reduction sheet is placed in one of the following directions: the noise reduction sheet in all columns of the noise reduction sheet group is placed in the same direction; the noise reduction sheet in each column of the noise reduction sheet group is placed in the same direction; and the noise reduction sheet in adjacent columns of the noise reduction sheet group is placed in a different direction.

[0013] Furthermore, the top plate and the two side plates, from the outside to the inside, sequentially include a corrugated plate, a first solid steel plate, a second solid steel plate, and a galvanized perforated plate;

[0014] The troughs of the corrugated plate are welded to the first solid steel plate, and the crests of the corrugated plate and the first solid steel plate are directly filled with sound-absorbing cotton.

[0015] There is a first inner cavity between the first solid steel plate and the second solid steel plate, and the first inner cavity is filled with sound-absorbing cotton;

[0016] The second solid steel plate and the galvanized perforated plate have a second inner cavity, which is filled with sound-absorbing cotton.

[0017] Furthermore, the base plate comprises, from the outside to the inside, a third solid steel plate and a fourth solid steel plate; a third inner cavity is formed between the third solid steel plate and the fourth solid steel plate, and the third inner cavity is filled with sound-absorbing cotton. Beneficial effects:

[0018] As can be seen from the above technical solutions, this utility model provides an exhaust noise reduction box for generator sets, which has the following beneficial effects:

[0019] 1. Achieved multi-mode noise reduction: Through the locking and limiting of the first, second and fourth bending plates, the noise reduction sheets can support multiple array arrangements, including horizontal parallel placement, oblique placement and alternating placement. The spacing between the noise reduction sheets, the incident angle and the channel cross-section ratio can be finely adjusted on the installation site according to the unit's air volume and pressure drop requirements to meet the exhaust requirements of different container generator sets. The noise absorption is completed by using the multi-array arrangement of noise reduction sheets.

[0020] 2. Multi-level noise reduction is achieved: The N-column noise reduction sheet group achieves N levels of noise reduction for the exhaust hot air. The detachable louvers on the cabinet further enhance the noise reduction level and prevent external noise pollution.

[0021] 3. High Safety: The noise reduction sheet is filled with fire-retardant sound-absorbing cotton. While utilizing the porous material of this cotton for sound absorption, it also prevents the exhaust hot air from causing a fire hazard. Furthermore, the lifting corner fittings are also filled with fire-retardant sound-absorbing cotton, further eliminating potential hazards. An EPDM gasket is attached to the side of the fifth bend facing the generator set, sealing the exhaust noise reduction box to the container housing the generator set. This prevents rainwater from entering and damaging the internal components, improving the safety of the system. Simultaneously, EPDM shock absorption further protects the exhaust noise reduction box and the container housing the generator set. The detachable louvers on the box provide rainproofing, dustproofing, and noise reduction, further enhancing safety.

[0022] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered part of the inventive subject matter of this disclosure, provided that such concepts do not contradict each other.

[0023] The foregoing and other aspects, embodiments, and features of the teachings of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0024] The accompanying drawings are not drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0025] Figure 1 This is a top sectional view of an exhaust noise reduction box for a generator set according to an embodiment of this application.

[0026] Figure 2 This is a side sectional view of an exhaust noise reduction box for a generator set according to an embodiment of this application.

[0027] Figure 3 As in the embodiments of this application Figure 2 Enlarged view of point A.

[0028] Figure 4 As in the embodiments of this application Figure 2 Enlarged view of point B.

[0029] Figure 5 As in the embodiments of this application Figure 2 Enlarged view of point C.

[0030] Figure 6 This is a top cross-sectional view of another placement direction of the noise reduction box for the exhaust noise reduction box of a generator set, as described in an embodiment of this application.

[0031] Figure 7 This is a schematic diagram of the composition of the side plate in the embodiments of this application.

[0032] Explanation of icon numbers:

[0033] 1. Base plate; 2. Top plate; 3. Side plate; 4. Louver; 5. First bending plate; 6. Second bending plate; 7. Noise reduction sheet; 8. Lifting corner fitting; 9. Third bending plate; 10. Fourth bending plate; 11. Corrugated plate; 12. First solid steel plate; 13. Second solid steel plate; 14. Galvanized perforated plate. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0035] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0036] During operation, the exhaust side of a containerized generator set is responsible for expelling high-temperature hot air and airflow pulsations. Silencing / noise reduction components, such as commonly used straight-through silencers, are typically installed at the exhaust end. However, this structure has a single airflow path, is weak for low- and medium-frequency frequencies and blade tip frequencies, and is prone to forming bypass leakage channels when wind pressure changes abruptly. This makes it difficult to meet all the requirements of the containerized generator set. Furthermore, the high-temperature hot air on the exhaust side can easily cause equipment failure and pose safety hazards.

[0037] Therefore, this utility model embodiment provides an exhaust noise reduction box for generator sets, referring to... Figure 1 and Figure 2 It includes a box body formed by a bottom plate 1, a top plate 2 and two side plates 3. The box body is open at both ends. One end of the box body is detachably connected to a louver 4, and the other end of the box body faces the generator set.

[0038] Reference Figure 2 and Figure 3The inner surface of the base plate 1 is detachably connected to two ends near the louvers 4 and near the generator set, with first bending plates 5. The first bending plate 5 includes a first bending portion with threaded holes and detachably connected to the base plate 1 by first bolts, and a second bending portion perpendicular to the first bending portion. (Refer to...) Figure 2 and Figure 4 A plurality of second bending plates 6 are detachably connected between the two first bending plates 5. Each second bending plate 6 includes a third bending portion with threaded holes and detachably connected to the base plate 1 by second bolts, and also includes fourth bending portions perpendicular to both ends of the third bending portion. (Refer to...) Figure 1 and Figure 6 The inner surface of the top plate 2 is vertically aligned with the bottom plate 1 and is fitted with a first bending plate 5 and a second bending plate 6. Noise reduction sheets 7 are engaged between the second bending portion and the fourth bending portion, and between two adjacent fourth bending portions in the adjacent second bending plates 6.

[0039] The enclosure can be a rectangular prism, assembled by continuous corner welding or fillet welding. The inner sides of both ends of the base plate 1 are connected to the first bent plate 5 with M6-M8 bolts. The first bent portion is arranged along the surface of the base plate 1 and has evenly distributed threaded holes. The second bent portion vertically forms a lateral limiting edge for the noise-reducing plate 7. Multiple second bent plates 6 are assembled between the two first bent plates 5. The third bent portion of the second bent plate 6 is bolted to the base plate 1, and the two fourth bent portions vertically clamp and position the noise-reducing plate 7. Mirror images of the first bent plates 5 and second bent plates 6 are positioned on the inner surface of the top plate 2, allowing for simultaneous vertical and vertical limiting of the noise-reducing plate 7. The noise reduction sheet 7 is inserted into the slot between the second and fourth bends, and between the two fourth bends of adjacent second bend plates 6, ensuring the stability of the exhaust path formed by the multi-array noise reduction arrangement. Furthermore, the detachable structure facilitates on-site adjustment of the number of noise reduction sheets 7, the spacing between the sheets, and subsequent maintenance and replacement by staff. The louver 4 is located at the end furthest from the generator set and is detachably connected to the housing with bolts.

[0040] In some embodiments, reference is made to Figure 1 and Figure 2 The top plate 2, bottom plate 1, and side plate 3 are all rectangular plates. Lifting brackets 8 are fixed to the two corners of the top plate 2 near the louvers 4, the two corners of the bottom plate 1 near the louvers 4, the two corners of the top plate 2 near the generator set, and the two corners of the bottom plate 1 near the generator set. A square pipe is welded between the two lifting brackets 8 on the same side of the noise reduction box. Fireproof and sound-absorbing cotton can be filled into the square pipe to improve the fire resistance and noise reduction capabilities of the noise reduction box.

[0041] The lifting corner fitting 8 is made of thick steel plate and continuously welded to the box body at the corresponding corner. Each corner fitting is provided with a through hole that matches the lifting ring or lifting shackle. Reinforcing ribs can also be arranged between the corner fitting and the box body plate to distribute stress and meet the lifting balance.

[0042] In some embodiments, reference is made to Figure 1 , Figure 2 and Figure 5 The top plate 2 and the bottom plate 1 near the generator set are both equipped with a third bending plate 9. The third bending plate 9 has a fifth bending part perpendicular to the bottom plate 1. The fifth bending part is provided with threaded holes for detachably connecting the container where the generator set is located.

[0043] The third bending plate 9 can be continuously welded simultaneously with the lifting corner piece 8 and the container body plate. The fifth bending part has threaded holes. During assembly, the third bending plate 9 is bolted to the end frame of the container where the generator set is located, achieving rigid positioning and detachable connection.

[0044] In some embodiments, an EPDM pad is attached to the side of the fifth bend facing the generator set.

[0045] The EPDM gasket is fully bonded to the fifth bend using weather-resistant rubber adhesive, ensuring a tight seal and vibration damping when spliced ​​with the container housing the generator set. To prevent air leakage at the bolt holes, sealing rings or localized secondary sealing gaskets can be added around the bolt holes to ensure sealing and vibration damping stability.

[0046] In some embodiments, reference is made to Figure 1 and Figure 6 There are N rows of noise reduction sheet groups on the base plate 1, from near the louver 4 to near the generator set, where N is a positive integer not exceeding 4. The noise reduction sheets 7 in each row of noise reduction sheet groups are parallel to each other. A set of limiting members is arranged between adjacent noise reduction sheets 7 in each row of noise reduction sheet groups. Each set of limiting members includes two fourth bending plates 10 that are directly opposite each other and installed on the base plate 1 and the top plate 2 respectively. The fourth bending plate 10 includes a sixth bending part with threaded holes and detachably connected to the base plate 1 or the top plate 2 by a third bolt, and also includes a seventh bending part that is perpendicular to both ends of the sixth bending part. The two seventh bending parts are respectively attached to the adjacent noise reduction sheets 7 in each row of noise reduction sheet groups.

[0047] N is a positive integer not exceeding 4. By limiting the maximum value of N to 4, excessive pressure loss during airflow is prevented, which could affect the normal operation of the generator set. N rows of noise-reducing plates are arranged in the exhaust direction. The row spacing and the spacing between adjacent noise-reducing plates 7 within a single row can be set according to the actual exhaust volume and the required noise reduction effect. Two fourth-bend plates 10 are positioned opposite each other. The fourth-bend plate 10 on the bottom plate 1 side is secured to the pre-drilled holes in the bottom plate 1 with a third bolt; the fourth-bend plates 10 on the top plate 2 side are mirror-installed with the same hole spacing. The seventh bend of the two fourth-bend plates 10 fits against the sides of the two adjacent noise-reducing plates 7, forming a limiting and clamping relationship. This ensures the straightness of the noise-reducing plate group and suppresses the vibration of the noise-reducing plates 7 caused by exhaust. By changing the position of the fourth-bend plates 10 or increasing or decreasing the number of fourth-bend plates 10, on-site adjustments to the noise-reducing plates 7 can be made to adapt to different operating conditions, meeting different airflow and noise reduction targets.

[0048] In some embodiments, the noise reduction sheet 7 has a hexagonal frame, the interior of which is filled with fire-retardant sound-absorbing cotton.

[0049] In some embodiments, the noise reduction sheet 7 is positioned in one of the following orientations: (Refer to...) Figure 6 In all columns of noise reduction sheet groups, each noise reduction sheet 7 is placed in the same orientation. This orientation is suitable for occasions where noise reduction requirements are not high or where easy assembly is required.

[0050] Reference Figure 1 In each column of noise reduction sheet group, all noise reduction sheets 7 are placed in the same direction, while the placement directions of noise reduction sheets 7 in adjacent columns are different. When noise reduction effect is required, the alternating directions between columns form a reverse airflow path to enhance the attenuation of obliquely incident sound waves and diffracted sound.

[0051] Both placement strategies are implemented within the existing structural system without altering the main structure of the container, ensuring ease and controllability of implementation.

[0052] In some embodiments, reference is made to Figure 1 and Figure 7 The top plate 2 and the two side plates 3, from the outside to the inside, include a corrugated plate 11, a first solid steel plate 12, a second solid steel plate 13, and a galvanized perforated plate 14. The troughs of the corrugated plate 11 are welded to the first solid steel plate 12, and the crests of the corrugated plate 11 and the first solid steel plate 12 are directly filled with sound-absorbing cotton. There is a first inner cavity between the first solid steel plate 12 and the second solid steel plate 13, and the first inner cavity is filled with sound-absorbing cotton. There is a second inner cavity between the second solid steel plate 13 and the galvanized perforated plate 14, and the second inner cavity is filled with sound-absorbing cotton.

[0053] In some embodiments, the corrugated plate 11 has a thickness of 0.8mm to 1.2mm, a wave height of 10mm to 25mm, and a pitch of 40mm to 80mm. The troughs and the first solid steel plate 12 with a thickness of 1.5mm to 3.0mm are joined by intermittent welding or short-seam continuous welding to ensure fit and vibration resistance. The space between the wave crests and the first solid steel plate 12 is filled with sound-absorbing cotton or fireproof sound-absorbing cotton, ensuring full filling without overflow. A first inner cavity with a thickness of 10mm to 25mm is formed between the first solid steel plate 12 and a second solid steel plate 13 with a thickness of 1.5mm to 3.0mm. A second inner cavity with a thickness of 15mm to 35mm is formed between the second solid steel plate 13 and a galvanized perforated plate 14 with a thickness of 0.6mm to 1.0mm. The perforated plate has an opening rate of 25% to 35% and a hole diameter of 2mm to 6mm. Since noise-reducing cotton is effective in reducing high-frequency noise, the above structure was designed to achieve full-band noise reduction and effectively reduce radiated noise in order to target low-frequency noise from 400Hz to 1000Hz.

[0054] In some embodiments, reference is made to Figure 2 The base plate 1 includes a third solid steel plate and a fourth solid steel plate from the outside to the inside; there is a third inner cavity between the third solid steel plate and the fourth solid steel plate, and the third inner cavity is filled with sound-absorbing cotton.

[0055] In some embodiments, the thickness of the third and fourth solid steel plates is 1.5mm to 3.0mm, and they are surrounded by folded edges or stiffeners to form a closed cavity with a thickness of 15mm to 35mm. To ensure waterproofing and durability, the outer surface of the base plate 1 can be sloped outwards at a gradient of 0.5% to 1.5%, and a drainage hole of 6mm to 10mm is provided at the lowest point, covered with a drip cap or labyrinth cover. The third inner cavity is filled with sound-absorbing cotton or fireproof sound-absorbing cotton. This sandwich structure provides effective low-frequency sound absorption volume while meeting load-bearing and waterproofing requirements.

[0056] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A noise reduction box for exhaust ventilation of a generator set, characterized in that, It includes a box-shaped enclosure consisting of a bottom plate, a top plate, and two side plates. The box-shaped enclosure is open at both ends, and one end of the box-shaped enclosure is detachably connected to a louver. The other end of the box-shaped enclosure faces the generator set. The inner surface of the base plate is detachably connected to the two ends near the louvers and the generator set with first bending plates. The first bending plate includes a first bending portion with a threaded hole and detachably connected to the base plate by a first bolt, and a second bending portion perpendicular to the first bending portion. A plurality of second bending plates are detachably connected between the two first bending plates. The second bending plate includes a third bending portion with a threaded hole and detachably connected to the base plate by a second bolt, and a fourth bending portion perpendicular to both ends of the third bending portion. The inner surface of the top plate is vertically aligned with the base plate with the first bending plates and the second bending plates. Noise reduction sheets are engaged between the second bending portion and the fourth bending portion, and between two adjacent fourth bending portions in adjacent second bending plates.

2. The exhaust noise reduction box for a generator set according to claim 1, characterized in that, The top plate, the bottom plate, and the side plate are all rectangular plates. Lifting corner pieces are fixed to the two corners of the top plate near the louvers, the two corners of the bottom plate near the louvers, the two corners of the top plate near the generator set, and the two corners of the bottom plate near the generator set.

3. The exhaust noise reduction box for a generator set according to claim 2, characterized in that, A third bending plate is welded to both the lifting angle brackets of the top plate and the bottom plate near the generator set. The third bending plate has a fifth bending portion perpendicular to the bottom plate, and the fifth bending portion has a threaded hole for detachably connecting to the container where the generator set is located.

4. The exhaust noise reduction box for a generator set according to claim 3, characterized in that, An EPDM pad is attached to the side of the fifth bend facing the generator set.

5. The exhaust noise reduction box for a generator set according to claim 1, characterized in that, The base plate is defined to have N columns of noise reduction sheet groups from near the louvers to near the generator set, where N is a positive integer not exceeding 4. The noise reduction sheets in each column of the noise reduction sheet group are parallel to each other. A set of limiting members is arranged between adjacent noise reduction sheets in each column of the noise reduction sheet group. Each set of limiting members includes two fourth bending plates that are vertically aligned and respectively installed on the base plate and the top plate. The fourth bending plate includes a sixth bending portion with threaded holes and detachably connected to the base plate or the top plate by a third bolt. It also includes a seventh bending portion that is perpendicular to both ends of the sixth bending portion. The two seventh bending portions are respectively attached to the adjacent noise reduction sheets in each column of the noise reduction sheet group.

6. The exhaust noise reduction box for a generator set according to claim 5, characterized in that, The noise reduction sheet has a hexagonal outer frame, and the interior of the outer frame is filled with fireproof and sound-absorbing cotton.

7. The exhaust noise reduction box for a generator set according to claim 6, characterized in that, The noise reduction sheet is placed in one of the following directions: the noise reduction sheet in all columns of the noise reduction sheet group is placed in the same direction; the noise reduction sheet in each column of the noise reduction sheet group is placed in the same direction; and the noise reduction sheet in adjacent columns of the noise reduction sheet group is placed in a different direction.

8. The exhaust noise reduction box for a generator set according to claim 1, characterized in that, The top plate and the two side plates, from the outside to the inside, consist of a corrugated plate, a first solid steel plate, a second solid steel plate, and a galvanized perforated plate. The troughs of the corrugated plate are welded to the first solid steel plate, and the crests of the corrugated plate and the first solid steel plate are directly filled with sound-absorbing cotton. There is a first inner cavity between the first solid steel plate and the second solid steel plate, and the first inner cavity is filled with sound-absorbing cotton; The second solid steel plate and the galvanized perforated plate have a second inner cavity, which is filled with sound-absorbing cotton.

9. The exhaust noise reduction box for a generator set according to claim 1, characterized in that, The base plate comprises a third solid steel plate and a fourth solid steel plate from the outside to the inside; there is a third inner cavity between the third solid steel plate and the fourth solid steel plate, and the third inner cavity is filled with sound-absorbing cotton.

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