A noise reduction structure for diesel generators

Abstract

This utility model relates to a noise reduction structure for a diesel generator, comprising a base, a housing, four connecting plates, two partition plates, and two horizontal plates. The housing is mounted on the base. The four connecting plates are arranged in pairs on the front and rear sides of the inner wall of the housing. The two partition plates are spaced apart on the left and right sides inside the housing, with one partition plate installed between two opposite connecting plates. This noise reduction structure for a diesel generator, through a multi-level structural and material combination, achieves a high-frequency noise absorption rate of over 80% and a low-frequency noise blocking effect that is more than 40% better than a single-layer cabinet. The overall noise reduction reaches 30-40 decibels, meeting the noise restriction requirements of sensitive places such as hospitals and schools. The design of the operating port facilitates generator inspection and maintenance, while the combination of sealing strips and sound insulation cotton ensures a balance between practicality and noise reduction.

Description

Technical Field

[0001] This utility model relates to the field of diesel generator technology, specifically to a noise reduction structure for diesel generators. Background Technology

[0002] Diesel generators, as commonly used backup or mobile power sources, play a vital role in numerous fields. However, the noise generated during their operation has always been a major problem for users and the surrounding environment. The sources of noise from diesel generators are diverse, mainly including the intense noise from engine combustion, friction and collision noise from mechanical parts, aerodynamic noise from the high-speed rotation of the cooling fan, and noise from the exhaust system discharging high-temperature, high-pressure gases. This noise not only damages the hearing of operators, but prolonged exposure to high-decibel noise can also lead to a series of health problems, such as tinnitus, insomnia, and high blood pressure. Furthermore, in noise-sensitive areas such as hospitals, schools, and residential areas, it can severely disrupt people's normal work, study, and life, causing noise pollution and affecting the quality of the surrounding environment. To effectively address the noise problem of diesel generators, the common practice is to place the generator inside a cabinet for protection and noise reduction. This type of cabinet can block noise transmission to a certain extent, playing a fundamental role in noise reduction. However, most generator cabinets currently on the market are single-layer structures. The noise reduction principle of a single-layer cabinet mainly relies on the cabinet's own materials to reduce noise transmission. However, its noise reduction effect has significant limitations. A single-layer cabinet cannot fully utilize a combination of various noise reduction methods and materials, making it difficult to comprehensively and thoroughly address noise of different frequencies. For high-frequency noise, a single-layer cabinet may not provide sufficient sound absorption, allowing some high-frequency noise to easily penetrate and propagate. For low-frequency noise, due to its strong penetrating power and diffraction, the blocking effect of a single-layer cabinet is greatly reduced, allowing low-frequency noise to travel long distances and have a wide impact.

[0003] According to actual tests and user feedback, when using a single-layer generator cabinet, the noise generated by the diesel generator during operation can still reach a high decibel level, far exceeding the noise restriction standards of some places, and failing to meet the increasingly stringent noise control requirements. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a noise reduction structure for diesel generators, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a noise reduction structure for a diesel generator, comprising a base, a housing, four connecting plates, two partition plates, and two horizontal plates; The outer shell is mounted on the base. The four connecting plates are arranged in pairs on the front and rear sides of the inner wall of the outer shell. The two partition plates are arranged at left and right intervals inside the outer shell. One of the partition plates is installed between the two front and rear opposite connecting plates. The two horizontal plates are spaced back-to-back inside the housing, with one of the horizontal plates installed between the two opposite connecting plates; Operating openings are provided inside the two horizontal plates and on the front and rear sides of the outer shell. A cover plate is hinged inside the operating opening and connected to the outer shell or horizontal plate by a latch.

[0006] Furthermore, gaps are maintained between the two horizontal plates and the front and rear sides of the inner wall of the outer shell.

[0007] Furthermore, the upper cross-section of the connecting plate is L-shaped.

[0008] Furthermore, a first sound insulation cotton is provided on the opposite side of the two partition plates and on the opposite side of the two horizontal plates.

[0009] Furthermore, a sealing strip is installed on the side of the cover plate facing the horizontal plate; A second sound-insulating cotton is provided on the side of the cover plate facing the horizontal plate. Furthermore, a top cover is provided on the top of the outer casing.

[0010] Furthermore, the outer shell, together with the two horizontal plates and the two partition plates, forms an independent soundproof cavity; The two horizontal plates, the two partition plates, the base, and the top cover combine to form an installation chamber for housing the generator.

[0011] Compared with the prior art, the technical solution of this application has the following beneficial effects: This noise reduction structure for diesel generators, through a combination of multi-level structures and materials, achieves a sound absorption rate of over 80% for high-frequency noise and a 40% or more improvement in low-frequency noise blocking compared to a single-layer cabinet. The overall noise reduction reaches 30-40 decibels, meeting the noise restriction requirements of sensitive locations such as hospitals and schools. The design of the operating port facilitates generator inspection and maintenance, while the combination of sealing strips and sound insulation cotton ensures a balance between practicality and noise reduction. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the unfolded structure of this utility model.

[0013] In the diagram: 1. Outer shell; 2. Connecting plate; 3. Partition plate; 4. Horizontal plate; 5. Cover plate; 6. Sealing strip; 7. Top cover; 8. First sound insulation cotton; 9. Second sound insulation cotton; 10. Base. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-2 The noise reduction structure for diesel generators in this embodiment solves the problem of insufficient noise reduction effect of existing single-layer cabinets by combining multi-layer structural design with sound insulation materials.

[0016] Its specific structure includes a base 10, an outer shell 1, four connecting plates 2, two partition plates 3, two horizontal plates 4, a cover plate 5, a sealing strip 6, a top cover 7, a first sound insulation cotton 8, and a second sound insulation cotton 9. Specifically, the outer shell 1 is fixedly installed on the base 10 to form the basic frame of the structure. The base 10 is made of steel plate with a thickness of 8mm. Its own weight reduces the vibration transmission during equipment operation and reduces secondary noise caused by vibration. The outer shell 1 is a cuboid frame, which is welded from double-layer cold-rolled steel plates. The inner steel plate is 3mm thick and the outer steel plate is 2mm thick. The two layers are filled with 5mm thick damping sound insulation felt, which can initially block the outward transmission of noise.

[0017] The four connecting plates 2 are divided into two groups, with two in each group welded to the front and rear sides of the inner wall of the outer shell 1 respectively. The upper cross-section of the connecting plate 2 is L-shaped, with its horizontal section facing the inside of the outer shell 1 and its vertical section welded and fixed to the inner wall of the outer shell 1.

[0018] Furthermore, the two partition plates 3 are arranged at left and right intervals inside the outer casing 1. The front and rear ends of one partition plate 3 are respectively fixed to the horizontal sections of the two front and rear connecting plates 2 by bolts. The other partition plate 3 is installed on the remaining two connecting plates 2 in the same way.

[0019] The two horizontal plates 4 are arranged at a distance from each other. The left and right ends of one of the horizontal plates 4 are fixed on the horizontal sections of the two connecting plates 2 that are opposite each other. The other horizontal plate 4 is installed in the same way. It is worth noting that the two horizontal plates 4 are respectively separated from the front and rear sides of the inner wall of the outer casing 1 by 5cm. This gap is reserved as a channel for heat dissipation of the equipment and can also reduce the propagation energy of noise through the buffering effect of the air layer.

[0020] Operating ports are provided inside the two horizontal plates 4 and on the front and rear sides of the outer shell 1. The operating ports are hinged to the cover plate 5. The edge of the cover plate 5 is equipped with a sealing strip 6 and is connected to the outer shell 1 or the horizontal plate 4 by a buckle. The side of the cover plate 5 facing the horizontal plate 4 is covered with a second sound insulation cotton 9, which is 2cm thick centrifugal glass wool. The sealing strip 6 is made of EPDM rubber and can fill the gap when the cover plate 5 is closed to prevent noise from leaking from the operating ports.

[0021] Furthermore, a first sound insulation cotton 8 is pasted on the opposite side of the two partition plates 3 and the opposite side of the two horizontal plates 4. The first sound insulation cotton 8 is a 3cm thick polyester fiber cotton, and its surface is covered with perforated aluminum foil, which can enhance the sound absorption effect and protect the sound insulation cotton from the airflow impact during equipment operation. The top cover 7 is fixed to the top of the outer shell 1 by bolts. The top cover 7 has a double-layer structure with 2cm thick rock wool filling in the middle to further block the transmission of noise from the top.

[0022] In actual setup, the left and right spaced partitions 3 and the front and rear spaced horizontal plates 4 intersect to form a grid-like frame, dividing the interior of the outer shell 1 into multiple areas. The grid-like frame can disrupt the propagation path of noise, causing noise to continuously consume energy during reflection. At the same time, the arrangement of the first sound insulation cotton 8 is designed for different frequency noises. The polyester fiber cotton has a sound absorption rate of over 80% for high-frequency noise, while the combination of the air layer and the board improves the blocking effect of low-frequency noise by more than 40% compared to a single-layer cabinet.

[0023] Finally, the outer shell 1, together with the two horizontal plates 4 and the two partition plates 3, forms an independent soundproof cavity. The cavity is a sealed air layer, which can absorb some low-frequency noise through the elasticity of the air. The two horizontal plates 4, the two partition plates 3, together with the base 10 and the top cover 7, form an installation chamber for placing the generator. The diesel generator is fixed in the installation chamber by a shock-absorbing pad to reduce the transmission of vibration to the base 10.

[0024] The working principle of the above embodiments is as follows: The noise generated by the generator first propagates within the installation chamber. The first sound insulation cotton 8 on the partition plate 3 and the horizontal plate 4 around the chamber absorbs some of the high-frequency noise. The closed structure of the chamber causes low-frequency noise to be reflected internally, consuming energy through multiple reflections. When the noise that is not absorbed by the installation chamber propagates to the outer shell 1, it needs to pass through the air buffer layer between the horizontal plate 4 and the outer shell 1. The air layer reflects some of the sound waves and consumes kinetic energy. Subsequently, the noise enters the sound insulation cavity formed by the outer shell 1, the partition plate 3, and the horizontal plate 4. The air layer in the cavity and the double-layer steel plate of the outer shell 1 further block low-frequency noise, significantly reducing the noise intensity. In addition, the sealing strip 6 of the cover plate 5 prevents noise from leaking from the operating port, the second sound insulation cotton 9 absorbs residual noise near the operating port, and the rock wool filling of the top cover 7 treats the high-temperature noise that propagates upward. Ultimately, the noise propagating outward from the overall structure is controlled to below 60 decibels.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 a process, method, article, or apparatus. Without further limitations, 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 said element.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A noise reduction structure for a diesel generator, characterized in that: It includes a base (10), a shell (1), four connecting plates (2), two partition plates (3) and two horizontal plates (4); The outer shell (1) is mounted on the base (10). The four connecting plates (2) are arranged in pairs on the front and back sides of the inner wall of the outer shell (1). The two partition plates (3) are arranged at left and right intervals inside the outer shell (1). One of the partition plates (3) is installed between the two front and back connecting plates (2). The two horizontal plates (4) are spaced back to back inside the outer casing (1), and one of the horizontal plates (4) is installed between the two connecting plates (2) that are opposite to each other on the left and right. Operating ports are provided inside the two horizontal plates (4) and on the front and rear sides of the outer shell (1), and a cover plate (5) is hinged inside the operating port. The cover plate (5) is connected to the outer shell (1) or the horizontal plate (4) by a latch.

2. The noise reduction structure for a diesel generator according to claim 1, characterized in that: The two horizontal plates (4) have gaps between them and the front and rear sides of the inner wall of the outer shell (1).

3. The noise reduction structure for a diesel generator according to claim 1, characterized in that: The upper cross-section of the connecting plate (2) is L-shaped.

4. The noise reduction structure for a diesel generator according to claim 1, characterized in that: First sound insulation cotton (8) is provided on the opposite side of the two partition plates (3) and the opposite side of the two horizontal plates (4).

5. The noise reduction structure for a diesel generator according to claim 1, characterized in that: A sealing strip (6) is installed on the side of the cover plate (5) facing the horizontal plate (4); The cover plate (5) is provided with a second sound insulation cotton (9) on the side facing the horizontal plate (4).

6. The noise reduction structure for a diesel generator according to claim 1, characterized in that: A top cover (7) is also provided on the top of the outer casing (1).

7. A noise reduction structure for a diesel generator according to claim 6, characterized in that: The outer shell (1), together with the two horizontal plates (4) and the two partition plates (3), forms an independent soundproof cavity; The two horizontal plates (4), the two partition plates (3), the base (10), and the top cover (7) are combined to form an installation chamber for placing a generator.

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