Noise reduction device of diesel generator

Abstract

The utility model relates to a noise reduction device of a diesel generator, and belongs to the technical field of environmental protection and noise reduction. Comprising a shell, a support, a smoke exhaust elbow, a pressure relief device, a cooling fan and a buffer module, the shell is formed by combining a plurality of aluminum alloy plates into a whole in a bolt connection and welding mode, the support is welded to the inner sides of the aluminum alloy plates, and the support supports a diesel generator; one end of the smoke exhaust elbow is mounted on a smoke exhaust port of the diesel generator, and the other end is connected with the pressure relief device; and the cooling fan is arranged above the diesel generator. The noise reduction device has the advantages that medium-high frequency noise is absorbed through the sound insulation cotton, exhaust noise is reduced through the combined design of the smoke exhaust elbow and the pressure relief device, and the noise reduction effect is remarkable; the generator body is cooled through the cooling fan, and the air inlet and the air outlet of the shell are matched, so that the contradiction among noise reduction, heat dissipation and air inlet is solved, and the power loss of the diesel generator is reduced; and through the buffer module on the bottom plate of the shell, the amplitude of the diesel generator during working can be reduced, the resonance degree is reduced, and the buffer and noise reduction effects are achieved.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection and noise reduction technology, and in particular to a noise reduction device for diesel generators. Background Technology

[0002] Diesel generators generate high-decibel noise, vibration, and high temperatures during operation. Traditional noise reduction methods include: using soundproof enclosures, which can reduce noise but often sacrifice heat dissipation efficiency, leading to power loss or shortened lifespan of the diesel generator; and existing soundproof panel structures, although filled with sound-absorbing materials, have insufficient ventilation design, easily causing poor heat dissipation and insufficient air intake. Furthermore, the suppression effect of low-to-mid-frequency vibrations generated during diesel generator operation is limited. Vibrations that are not effectively isolated can be transmitted through the base to the soundproof enclosure shell, inducing shell resonance and generating secondary structural noise, and even causing weld breakage and affecting the reliability of the diesel generator. Therefore, there is an urgent need for a solution that integrates noise reduction, heat dissipation, and vibration damping optimization. Summary of the Invention

[0003] The purpose of this invention is to provide a noise reduction device for diesel generators, solving the problems of poor noise reduction effect, poor heat dissipation, and easy generation of secondary noise in existing noise reduction devices. This invention absorbs mid-to-high frequency noise through sound insulation cotton, reduces exhaust noise through the combination design of exhaust pipe and pressure relief device, and achieves significant noise reduction effect through the housing structure; it dissipates heat from the generator body through a cooling fan, and, in conjunction with the air inlet and outlet holes of the housing, resolves the contradiction between noise reduction, heat dissipation, and air intake, reducing the power loss of the diesel generator; through the buffer module of the housing bottom plate, it can reduce the amplitude of the diesel generator during operation, reduce the resonance degree of the housing structure, and achieve the effect of buffering and noise reduction.

[0004] The above-mentioned objective of this utility model is achieved through the following technical solution:

[0005] The noise reduction device for a diesel generator includes a housing 1, sound insulation cotton 2, a bracket 3, an exhaust pipe 5, a pressure relief device 6, a cooling fan 7, a buffer module, lifting lugs 11, fixing lugs 12, and clips 13. The housing 1 is composed of multiple aluminum alloy plates connected by bolts and welding. The bracket 3 is welded to the inner side of the aluminum alloy plates, and the inner wall surface is bonded with sound insulation cotton 2. The bracket 3 supports the diesel generator 4. One end of the exhaust pipe 5 is installed on the original exhaust port of the diesel generator 4, and the other end is connected to the pressure relief device 6. The cooling fan 7 is installed above the diesel generator 4.

[0006] The cooling fan 7 is installed above the diesel generator 4 and achieves real-time temperature-controlled variable speed cooling through a motor, temperature sensor and control module; the bottom of the lifting lug 11 has an external thread that engages with the internal thread of the mounting hole on the top of the housing 1; the bottom of the fixing lug 12 also has an external thread that engages with the internal thread of the mounting holes on the four side plates of the housing 1; the buckle 13 is fixed to the top of the side plate on one side of the pressure relief device 6 by means of threaded connection, and the middle through hole of the buckle 13 securely fixes the pressure relief device 6 to the side plate.

[0007] The housing 1 is a box structure made of multiple aluminum alloy plates connected and welded together by bolts. The bottom plate and the side plate on the exhaust port side are movable plates, connected to adjacent housing plates by bolts, facilitating the installation, disassembly, and maintenance of the housing 1 and the internal diesel generator. Sealing strips are installed at the joints between the movable plates and adjacent housing plates. Sound insulation cotton 2, which is high-temperature resistant glass wool, is adhered to the inner wall of the aluminum alloy plates.

[0008] The exhaust pipe 5 is composed of three 90° bends welded together, with a total bend of 270°, which serves as a primary noise reduction function. The diameter of the exhaust pipe 5 is the same as that of the original exhaust pipe. One end of the exhaust pipe is connected to the original exhaust port of the diesel generator 4, and the other end passes through the through hole on the top of the housing and connects to the bottom of the pressure relief device 6.

[0009] The pressure relief device has a mesh size of 5-10mm and a mesh density of 20-30 meshes / cm². The outer and inner cylinder diameters are increased by 50% and 40% respectively compared to the original exhaust pipe diameter.

[0010] The pressure relief device 6 consists of an outer cylinder 61 and an inner cylinder 62. The outer cylinder 61 is a cylindrical body with a mesh. The center of the base 6 of the pressure relief device 6 has a through circular hole, and the outer end of the base is used to achieve a sealed connection with the exhaust pipe 5. The inner cylinder 62 is a cylindrical body, and its lower end is embedded in a groove on the upper surface of the inner surface of the base of the outer cylinder 61. The exhaust port at the top is inserted into the middle through hole of the buckle 13. The buckle 13 is welded to the outside of the movable plate, which securely fixes the pressure relief device 6 to the housing 1. The outer cylinder 61 and the inner cylinder 62 have multiple circular through holes arranged in an axial and circumferential array on their cylindrical walls. The diameters of the outer cylinder 61 and the inner cylinder 62 are increased by 50% and 40% respectively compared to the original exhaust pipe diameter, which plays a secondary role in noise reduction.

[0011] The two shell plates opposite each other in the shell 1 are respectively provided with air inlets and air outlets. A real-time temperature-controlled variable speed cooling fan 7 is installed between the air inlet and air outlet inside the shell 1. The real-time temperature-controlled variable speed design is adopted. Through the control unit module, the temperature sensor is connected to the cooling fan motor. The temperature sensor senses the temperature of the space inside the shell 1. The higher the temperature, the faster the fan speed; the lower the temperature, the slower the fan speed. This realizes automatic adjustment of heat dissipation efficiency and provides sufficient air for the diesel generator to work, ensuring that the working efficiency of the diesel generator is not reduced.

[0012] The buffer module consists of a rubber ring 8, a nut 9, and a bolt 10. The rubber ring 8 is a concave cylinder made of rubber, with the nut 9 embedded in the recess. The nut 9 is fixed to the bolt 10 via a threaded connection, and the bolt 10 is mounted on the base plate of the housing. This design allows the rubber ring to be directly fixed to the worktable, and the number of rubber rings can be increased or decreased according to the installation position and buffering requirements.

[0013] The beneficial effects of this utility model are as follows:

[0014] (1) The diesel generator noise reduction device of this utility model absorbs medium and high frequency noise through sound insulation cotton, and reduces exhaust noise by combining exhaust pipe and pressure relief device. The noise reduction effect of the box structure is significant.

[0015] (2) The noise reduction device of the diesel generator actively dissipates heat through the cooling fan, and with the air inlet and outlet of the casing, it solves the contradiction between noise reduction and heat dissipation and air intake, and reduces the power loss of the diesel generator.

[0016] (3) The noise reduction device of the diesel generator reduces the amplitude of the diesel generator during operation through the buffer module of the bottom plate of the housing, thereby achieving a buffering effect. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the present invention and form part of this application, illustrate the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0018] Figure 1 This is a cross-sectional structural diagram of the diesel generator noise reduction device of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the diesel generator noise reduction device of this utility model;

[0020] Figure 3 This is a cross-sectional structural diagram of the pressure relief device of this utility model.

[0021] In the diagram: 1. Shell; 2. Sound insulation cotton; 3. Bracket; 4. Diesel generator; 5. Exhaust pipe bend; 6. Pressure relief device; 7. Cooling fan; 8. Rubber ring; 9. Nut; 10. Bolt; 11. Lifting lug; 12. Fixing lug; 13. Buckle. Detailed Implementation

[0022] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. To make the above-mentioned objects, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] See Figures 1 to 3 As shown, the diesel generator noise reduction device of this utility model mainly includes a housing 1, sound insulation cotton 2, bracket 3, exhaust pipe 5, pressure relief device 6, cooling fan 7, buffer module, lifting lug 11, fixing lug 12 and buckle 13.

[0024] The housing 1 is composed of aluminum alloy plates connected by welding and bolting. The bottom plate and the side plate on the exhaust port side are detachable movable plates, while the remaining aluminum alloy plates are welded together and bolted to assemble the movable plates into a box structure. Sound insulation cotton 2, made of high-temperature resistant glass wool with a thickness of 3mm, is fitted to the inner wall surface of the housing plates to effectively absorb noise. Air inlets and outlets are respectively provided on opposite sides of the aluminum alloy plates on both sides of the housing 1, with the air inlets covered by filters to prevent external impurities from being drawn into the housing 1. A bracket 3 is welded to the inner side of the aluminum alloy plates, and a diesel generator 4 is bolted to the bracket 3. Necessary shock-absorbing rubber pads are installed between the bracket 3 and the diesel generator 4 to reduce resonance noise.

[0025] The lifting lug 11 has an external thread at its bottom, which engages with the internal thread of the mounting hole at the top of the housing 1, securely fixing the lifting lug 11 to the top of the housing 1 for connecting lifting cables, used for lifting, moving, or fixing the diesel generator noise reduction device; the fixing lug 12 has an external thread at its bottom, which engages with the internal thread of the mounting holes on the four side plates of the housing 1, securely fixing the fixing lug 12 to the side plate, allowing fixing ropes to pass through, fixing the diesel generator noise reduction device to the workbench, preventing displacement due to vibration during operation. The buckle 13 is fixed above the side plate where the pressure relief device 6 is installed by a threaded connection, and the top of the inner cylinder 62 of the pressure relief device 6 passes through the through hole in the middle of the buckle 13, securely fixing the pressure relief device 6 to the side plate.

[0026] One end of the exhaust bend 5 is installed on the original exhaust port of the diesel generator 4. It features a 90° bend design and is made of stainless steel with a smooth inner wall to reduce airflow resistance. The exhaust gas from the diesel generator flows continuously through three bends, changing the direction of the exhaust gas flow and inducing turbulent dissipation, thus achieving primary silencing and reducing exhaust noise. The other end of the exhaust bend 5 is connected to the pressure relief device 6, which is a mesh-like cylindrical assembly consisting of an outer cylinder 61 and an inner cylinder 62. The diameters of the outer and inner cylinders are increased by 50% and 40% respectively compared to the original exhaust pipe diameter. The exhaust port at the top of the inner cylinder 62 engages with the clip 13 to securely fix the pressure relief device 6 to the housing 1. Therefore, the pressure at the end of the exhaust port gradually decreases, reducing the noise during exhaust gas discharge and achieving secondary silencing.

[0027] Air inlets and outlets are respectively formed on two opposite shell plates of the shell 1. Inside the shell 1, a cooling fan 7 is provided directly above the diesel generator 4. The cooling fan 7 adopts a real-time temperature-controlled variable speed design, that is, the temperature sensor is connected to the cooling fan motor through the control module embedded in the fan motor to achieve the purpose of automatically adjusting the heat dissipation efficiency. The higher the temperature inside the shell 1, the faster the fan speed, the more cold air flows over the surface of the diesel generator, and the better the cooling effect. At the same time, the operation of the fan increases the amount of air entering the shell 1, providing sufficient air for the diesel generator to work and ensuring that the working efficiency of the diesel generator does not decrease.

[0028] The exhaust pipe 5 is composed of three 90° bends welded together, with a total bend of 270°, which serves as a primary noise reduction function. The diameter of the exhaust pipe 5 is the same as that of the original exhaust pipe. One end of the exhaust pipe 5 is directly connected to the original exhaust port of the diesel generator 4, and the other end passes through the through hole on the top of the housing and connects to the bottom of the pressure relief device 6.

[0029] The pressure relief device 6 consists of an outer cylinder 61 and an inner cylinder 62. The outer cylinder 61 is a cylindrical shape with a base, and a through circular hole is formed in the center of the base. The outer end of the base is used to achieve a sealed connection with the exhaust pipe 5. The inner cylinder 62 is a cylindrical body, and its lower end is embedded in a groove on the upper surface of the inner surface of the base of the outer cylinder 61. The exhaust port at the top is inserted into the middle through hole of the buckle 13. The buckle 13 is welded to the outside of the movable plate to securely fix the pressure relief device 6 to the housing 1. The outer cylinder 61 and the inner cylinder 62 have multiple circular through holes arranged in an axial and circumferential array on their cylindrical walls, and the diameters of the outer cylinder 61 and the inner cylinder 62 are increased by 50% and 40% respectively compared to the original exhaust pipe diameter.

[0030] See Figures 1 to 3As shown, in actual use, the noise reduction device for diesel generators of this utility model is first placed on the workbench. The housing of the noise reduction device is then leveled by adjusting the bottom nut 9. The housing is then initially fixed using a fixing rope and fixing lug 12. Next, the diesel generator 4 is installed on the bracket 3 inside the housing 1. One end of the exhaust pipe 5 is connected to the exhaust port of the diesel generator 4. The buckle 13 is fixed to the movable plate with bolts. The top of the inner cylinder 62 of the pressure relief device 6 passes through the through hole of the buckle 13. The other end of the exhaust pipe 5 passes through the mounting hole on the movable plate and connects to the bottom of the outer cylinder 61 of the pressure relief device 6. The movable plate is then fixed to the housing 1 with bolts. After assembly, the fixing rope is tightened, and the noise reduction device housing is securely fixed to the workbench. During actual operation, the exhaust gas from the diesel generator 4 flows through the exhaust port, exhaust pipe 5, and pressure relief device 6 to the outside. This process achieves a combined noise reduction and silencing effect. Furthermore, the fan continues to operate, reducing the temperature of the diesel generator body. The buffer module below the housing also reduces the overall amplitude of the diesel generator.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made to this utility model should be included within the protection scope of this utility model.

Claims

1. A noise reduction device for a diesel generator, characterized in that: The device includes a housing (1), a bracket (3), an exhaust pipe (5), a pressure relief device (6), a cooling fan (7), and a buffer module. The housing (1) is composed of multiple aluminum alloy plates connected by bolts and welding. The bracket (3) is welded to the inner side of the aluminum alloy plates, and the bracket (3) supports the diesel generator (4). One end of the exhaust pipe (5) is installed on the exhaust port of the diesel generator (4), and the other end is connected to the pressure relief device (6). The cooling fan (7) is installed above the diesel generator (4).

2. The diesel generator noise reduction device according to claim 1, characterized in that: The shell (1) is an aluminum alloy plate, and the inner wall surface is bonded with sound insulation cotton (2), which is made of high temperature resistant glass wool.

3. The diesel generator noise reduction device according to claim 1, characterized in that: The exhaust pipe (5) is made of three 90° bends welded together, with a total bending degree of 270°. One end of the exhaust pipe (5) is connected to the exhaust port of the diesel generator (4), and the other end passes through the through hole on the top of the housing and is connected to the bottom of the pressure relief device (6).

4. The diesel generator noise reduction device according to claim 1, characterized in that: The pressure relief device (6) consists of an outer cylinder (61) and an inner cylinder (62). The outer cylinder (61) is a cylindrical tube with a mesh, the mesh size is 5-10 mm, the mesh density is 20-30 meshes / cm², and the diameters of the outer cylinder and the inner cylinder are 50% and 40% larger than the diameter of the exhaust pipe, respectively.

5. The diesel generator noise reduction device according to claim 1, characterized in that: The housing (1) has an air inlet and an air outlet on two aluminum alloy plates that are opposite each other. The housing (1) is equipped with a real-time temperature-controlled variable speed cooling fan (7). The cooling fan (7) is installed above the diesel generator (4). The temperature sensor is connected to the cooling fan motor through the control module to realize automatic adjustment of the heat dissipation efficiency.

6. The diesel generator noise reduction device according to claim 1, characterized in that: The buffer module includes a rubber ring (8) and a bolt (10). The rubber ring (8) is a concave cylinder made of rubber, with a nut (9) embedded in the concave part. The nut (9) is connected and fixed to the bolt (10), and the bolt (10) is installed on the bottom plate of the housing (1).

7. The diesel generator noise reduction device according to claim 1, characterized in that: The top of the housing (1) is threaded with a lifting lug (11), and the four side plates of the housing (1) are fitted with fixing lugs (12).

8. The diesel generator noise reduction device according to claim 1 or 4, characterized in that: The pressure relief device (6) is connected to the housing (1) via a buckle (13). The pressure relief device (6) passes through the through hole in the middle of the buckle (13), and the buckle (13) is fixed to the side plate of the housing (1) by bolts.

Images