Multi-stage impedance composite muffling structure of a generator set silencer

Abstract

This application discloses a multi-stage impedance composite silencing structure for generator set soundproof enclosures, belonging to the technical field of engine noise reduction. The multi-stage impedance composite silencing structure includes a housing with fan blades and louvers inside. The high-speed exhaust gas from the diesel engine causes the fan blades to rotate and the louvers to oscillate. The fan blades and louvers obstruct the airflow, cutting and dispersing the high-speed, uniformly flowing air, thus reducing the airflow noise caused by the high-speed airflow. This effectively reduces the noise generated by the diesel engine exhaust in the generator set. A particulate layer is provided inside the housing, and a spray valve is fixed to the upper inner wall of the housing. The spray valve can spray alkaline liquid to neutralize sulfides and nitrates in the diesel engine exhaust in the generator set online. When the particulate layer is clogged, the spray valve sprays a large amount of clean water to flush the particulate layer, achieving online cleaning of the particulate layer and enhancing the versatility of the generator set soundproof enclosure silencing structure.

Description

Technical Field

[0001] This invention relates to a multi-stage impedance composite noise reduction structure for generator set soundproof boxes, belonging to the technical field of engine noise reduction. Background Technology

[0002] Existing generator sets are mainly driven by diesel engines. When the diesel engine is working, the exhaust gas and noise generated by the engine are mainly absorbed by the soundproof box. The exhaust gas noise generated by the engine includes turbulence noise and jet noise that occur when the engine exhaust flows.

[0003] Existing generator set diesel engine soundproof enclosures are mostly single-function and simple in structure, often focusing only on noise reduction by simply filling the outer wall of the enclosure with some sound-absorbing or sound-insulating materials. This provides limited noise control. The exhaust gas produced by diesel engines has a complex composition, containing certain components of sulfides and nitrates. Existing soundproof enclosures do not have the function of online removal of sulfides and nitrates, making them increasingly unsuitable for environmental protection requirements. To address this, some technicians in this field have developed a multi-stage impedance composite noise reduction structure for generator set soundproof enclosures to overcome the problems mentioned in the background technology. Summary of the Invention

[0004] The technical problem to be solved by this invention is to address the above-mentioned shortcomings by providing a multi-stage impedance composite noise reduction structure for generator set soundproof boxes. This invention has a multi-impedance structure inside the generator set soundproof box, which can automatically interfere with the turbulence that occurs during engine exhaust flow. It also has an online structure for eliminating sulfides and nitrates, which can automatically eliminate sulfides and nitrates in the exhaust gas of diesel engines, thereby improving the noise reduction effect of the generator set soundproof box and enhancing the diversity of the generator set soundproof box structure.

[0005] To solve the above technical problems, the present invention adopts the following technical solution: The generator set soundproof box has a multi-stage impedance composite noise reduction structure, including a shell. The outer surface of the shell is covered with a heat-insulating and sound-absorbing layer. The shell also has a particle layer inside, and a cooling layer is located below the particle layer. An air intake pipe is connected to the top of the shell. A vertical cylinder is located at the center of the air intake of the shell. The vertical cylinder is fixedly installed on the inner wall of the shell by a connecting rod. A rotating column is located inside the vertical cylinder. The rotating column can rotate inside the vertical cylinder. An encoder is located on the surface of the rotating column. A fan blade is also fixedly connected to the lower part of the rotating column.

[0006] Furthermore, a turntable is fixedly connected to the lower end of the rotating column, a turntable column is fixedly connected to the lower surface of the turntable, a horizontal cylinder is fixedly connected to the lower end of the turntable column, a horizontal bar is provided inside the horizontal cylinder, and a rotating shaft is provided below the horizontal bar. The rotating shafts are evenly distributed between the inner walls of the shell.

[0007] Furthermore, the two ends of the crossbar are connected to the upper surface of the rotating shaft via connecting rods, and louvers are fixed to the lower surface of the rotating shaft.

[0008] Furthermore, a particulate layer is located below the louvers. This particulate layer is made of ceramic material and is used to absorb particulate matter in the exhaust gas from the diesel engine.

[0009] Furthermore, the cooling layer inside the shell is hollow, and ventilation pipes run through the upper and lower surfaces of the cooling layer. The ventilation pipes of the cooling layer are S-shaped. One end of the cooling layer is connected to a water inlet pipe, which is equipped with a water inlet valve. The other end of the cooling layer is connected to a water outlet pipe, which is equipped with a water outlet valve.

[0010] Furthermore, a metal mesh is provided below the cooling layer, with metal strips evenly distributed on the lower surface of the metal mesh. The lower ends of the metal strips are connected to the bottom of the shell. An air vent is also provided inside the lower part of the shell, and an air vent pipe is connected above the air vent, with the air vent pipe extending out of the shell.

[0011] Furthermore, a drain pipe is connected to the lower part of the housing, and a drain valve is provided on the drain pipe. A flow-collecting groove is also provided inside the housing; the flow-collecting groove is annular and fixed to the inner wall of the housing. Furthermore, a return pipe is provided on the outside of the housing. The upper end of the return pipe is connected to the upper part of the housing's manifold, and the lower end of the return pipe is connected to the lower part of the housing. A spray valve and an inlet pressure sensor are also fixedly connected to the upper inner wall of the housing, and an outlet pressure sensor is also fixedly connected to the lower inner wall of the housing.

[0012] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: 1. The present invention relates to a multi-stage impedance composite noise reduction structure for a generator set soundproof enclosure, comprising a housing, a vertical cylinder at the air inlet of the housing, a rotating column inside the vertical cylinder, a fan blade fixedly connected to the lower part of the rotating column, a turntable fixedly connected to the lower end of the rotating column, a rotating shaft below the turntable, and a louvered plate fixedly connected to the lower surface of the rotating shaft. The high-speed exhaust gas from the diesel engine causes the fan blade to rotate, and the rotation of the fan blade drives the louvered plate to swing. The fan blade obstructs the airflow, cutting off and dispersing the high-speed airflow with the same direction, thereby reducing the airflow noise caused by the high-speed airflow. The louvered plate swings back and forth inside the housing, further blocking the high-speed airflow with the same direction, thereby effectively reducing the noise generated by the diesel engine exhaust gas in the generator set.

[0013] 2. The generator set soundproof box of this invention has a multi-stage impedance composite silencing structure with a particle layer inside the shell. The particle layer is used to absorb particulate matter in the exhaust gas of the diesel engine. A spray valve is also fixed to the upper inner wall of the shell. The spray valve can spray alkaline liquid to neutralize sulfides and nitrates in the diesel engine exhaust gas in the generator set online. When the particle layer is blocked, the spray valve will spray a large amount of clean water to flush the particle layer, realizing online cleaning of the particle layer and enhancing the diversity of the silencing structure of the generator set soundproof box. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale and orientation.

[0015] Figure 1 This is a front view diagram of the structural connection of the present invention; Figure 2 This is a side view schematic diagram of the connection between the housing, fan blades and louvered plate structure of the present invention.

[0016] In the diagram: 1-Inlet pipe, 2-Shell, 3-Heat insulation and sound absorption layer, 4-Particle layer, 5-Cooling layer, 6-Water inlet valve, 7-Water outlet valve, 8-Outlet pipe, 9-Outlet hood, 10-Metal strip, 11-Spray valve, 12-Rotating column, 13-Vertical cylinder, 14-Encoder, 15-Fan blade, 16-Turntable, 17-Horizontal cylinder, 18-Horizontal bar, 19-Turntable column, 20-Rotating shaft, 21-Louvre, 22-Metal mesh, 23-Gathering groove, 24-Return pipe, 25-Drain valve, 26-Outlet pressure sensor, 27-Inlet pressure sensor. Detailed Implementation

[0017] like Figure 1 and Figure 2 As shown, the generator set soundproof box has a multi-stage impedance composite noise reduction structure, including a shell 2. The outer surface of the shell 2 is covered with a heat-insulating and sound-absorbing layer 3. An air inlet pipe 1 is connected to the top of the shell 2. A vertical cylinder 13 is provided at the center of the air inlet of the shell 2. The vertical cylinder 13 is fixedly installed on the inner wall of the shell 2 by a connecting rod. A rotating column 12 is provided inside the vertical cylinder 13. The rotating column 12 can rotate inside the vertical cylinder 13. An encoder 14 is provided on the surface of the rotating column 12. The encoder 14 is used to detect the rotation speed of the rotating column 12. A fan blade 15 is also fixedly connected to the lower part of the rotating column 12.

[0018] The lower end of the rotating column 12 is fixedly connected to a turntable 16, the lower surface of the turntable 16 is fixedly connected to a turntable column 19, the lower end of the turntable column 19 is fixedly connected to a horizontal cylinder 17, a horizontal bar 18 is provided inside the horizontal cylinder 17, a rotating shaft 20 is provided below the horizontal bar 18, the rotating shaft 20 is evenly distributed between the inner walls of the housing 2, and can rotate between the inner walls of the housing 2, the two ends of the horizontal bar 18 are connected to the upper surface of the rotating shaft 20 by a connecting rod, and a louvered plate 21 is fixedly connected to the lower surface of the rotating shaft 20.

[0019] The shell 2 is also provided with a particle layer 4, which is located below the louvered plate 21. The particle layer 4 is made of ceramic material and is used to absorb particulate matter in the exhaust gas of the diesel engine. Below the particle layer 4, there is a cooling layer 5. The cooling layer 5 is hollow inside, and ventilation pipes are also passed through the upper and lower surfaces of the cooling layer 5. The ventilation pipes of the cooling layer 5 are S-shaped. One end of the cooling layer 5 is connected to a water inlet pipe, which is equipped with a water inlet valve 6. The other end of the cooling layer 5 is connected to a water outlet pipe, which is equipped with a water outlet valve 7. When the water inlet valve 6 and the water outlet valve 7 are opened, cooling circulating water flows inside the cooling layer 5.

[0020] Below the cooling layer 5, there is a metal mesh 22. Metal strips 10 are evenly distributed on the lower surface of the metal mesh 22. The lower end of the metal strips 10 is connected to the bottom of the shell 2. An air vent 9 is also provided in the lower part of the shell 2. An air vent pipe 8 is connected above the air vent 9 and extends out of the shell 2.

[0021] A drain pipe is connected to the bottom of the housing 2, and a drain valve 25 is provided on the drain pipe. A flow channel 23 is also provided inside the housing 2. The flow channel 23 is annular and located between the fan blade 15 and the louver plate 21. The flow channel 23 is fixed to the inner wall of the housing 2. A return pipe 24 is also provided outside the housing 2. The upper end of the return pipe 24 is connected to the upper flow channel 23 of the housing 2, and the lower end of the return pipe 24 is connected to the lower part of the housing 2. A spray valve 11 and an inlet pressure sensor 27 are also fixed to the upper inner wall of the housing 2. The inlet pressure sensor 27 is used to detect the inlet air pressure inside the housing 2. An outlet pressure sensor 26 is also fixed to the lower inner wall of the housing 2. The outlet pressure sensor 26 is used to detect the outlet air pressure inside the housing 2.

[0022] The exhaust gas from the diesel engine enters the housing 2 through the intake pipe 1. The high-speed airflow passes through the fan blade 15, causing the fan blade 15 to rotate inside the vertical cylinder 13. The fan blade 15 obstructs the airflow, cutting and dispersing the high-speed airflow with the same direction, reducing the airflow noise caused by the high-speed airflow. The rotation of the fan blade 15 drives the turntable 16 and the turntable column 19 to rotate. The rotation of the turntable column 19 drives the horizontal cylinder 17 to make a circular motion around the turntable 16 as the center. The circular motion of the horizontal cylinder 17 causes the horizontal bar 18 to swing back and forth in the vertical direction. At the same time, the horizontal cylinder 17 also slides back and forth in the horizontal direction of the horizontal bar 18. The back and forth swing of the horizontal bar 18 in the vertical direction drives the rotating shaft 20 and the louver 21 to swing back and forth inside the housing 2. The back and forth swing of the louver 21 inside the housing 2 further obstructs the high-speed airflow with the same direction.

[0023] At the same time, the spray valve 11 sprays out alkaline liquid, and the high-speed rotating fan blade 15 disperses the alkaline liquid. The sulfides and nitrates in the exhaust gas of the diesel engine dissolve in the alkaline liquid to form acidic ions, which then neutralize with the alkaline ions in the alkaline liquid to form neutral water molecules. The water molecules are then thrown onto the inner wall of the housing 2 by the high-speed rotating fan blade 15, and the liquid flows into the collection groove 23 and then flows to the bottom of the housing 2 through the return pipe 24.

[0024] The neutralized exhaust gas continues to flow towards the lower part of the shell 2. The particulate layer 4 absorbs the tiny particles in the exhaust gas. It flows through the curved ventilation pipes in the cooling layer 5 and then through the metal mesh 22. The curved ventilation pipes in the cooling layer 5 increase the flow path of the exhaust gas, allowing the high-temperature exhaust gas to be fully cooled in the cooling layer 5. The high-temperature mist is cooled and forms water droplets. The water droplets fall onto the surface of the metal strips 10 on the lower surface of the metal mesh 22 and fall to the bottom of the shell 2. When there is too much liquid at the bottom of the shell 2, the drain valve 25 opens, and the excess liquid in the shell 2 is discharged through the drain pipe, preventing excessive liquid accumulation in the shell 2.

[0025] After the above treatment, the low-temperature and low-pressure exhaust gas is discharged from the housing 2 through the exhaust hood 9 and the exhaust pipe 8. When the difference between the values ​​of the inlet pressure sensor 27 and the outlet pressure sensor 26 is greater than a certain set value, it indicates that the exhaust gas pressure at the top of the housing 2 is too high and the exhaust gas pressure at the bottom of the housing 2 is too low. This indicates that too many tiny particles are adsorbed by the particle layer 4, causing the particle layer 4 to become clogged. The spray valve 11 sprays out a large amount of clean water to wash away the particles in the particle layer 4, thereby cleaning the particle layer 4 online and preventing the noise reduction structure of the cleaning chamber from becoming clogged.

[0026] The description of this invention is provided for illustrative purposes and is not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A multi-stage impedance composite noise reduction structure for generator set soundproof enclosure, characterized in that: The shell (2) is covered with a heat-insulating and sound-absorbing layer (3) on its outer surface. The shell (2) is also provided with a particle layer (4) inside and a cooling layer (5) below the particle layer (4). An air inlet pipe (1) is connected to the top of the shell (2). A vertical cylinder (13) is provided at the center of the air inlet of the shell (2). The vertical cylinder (13) is fixedly installed on the inner wall of the shell (2) by a connecting rod. A rotating column (12) is provided inside the vertical cylinder (13). The rotating column (12) can rotate inside the vertical cylinder (13). An encoder (14) is provided on the surface of the rotating column (12). A fan blade (15) is fixedly connected to the lower part of the rotating column (12).

2. The multi-stage impedance composite noise reduction structure for generator set soundproof enclosure as described in claim 1, characterized in that: The lower end of the rotating column (12) is fixedly connected to a turntable (16), the lower surface of the turntable (16) is fixedly connected to a turntable column (19), the lower end of the turntable column (19) is fixedly connected to a horizontal cylinder (17), a horizontal bar (18) is provided inside the horizontal cylinder (17), and a rotating shaft (20) is provided below the horizontal bar (18). The rotating shaft (20) is evenly distributed between the inner walls of the shell (2).

3. The multi-stage impedance composite noise reduction structure for generator set soundproof enclosure as described in claim 2, characterized in that: The two ends of the crossbar (18) are connected to the upper surface of the rotating shaft (20) by a connecting rod, and the lower surface of the rotating shaft (20) is fixed with a louvered plate (21).

4. The multi-stage impedance composite noise reduction structure for generator set soundproof enclosure as described in claim 3, characterized in that: The granular layer (4) is located below the louvered plate (21). The granular layer (4) is made of ceramic material and is used to absorb particulate matter in the exhaust gas of the diesel engine.

5. The multi-stage impedance composite noise reduction structure for generator set soundproof enclosure as described in claim 1, characterized in that: The cooling layer (5) inside the shell (2) is hollow. Ventilation pipes also run through the upper and lower surfaces of the cooling layer (5). The ventilation pipes of the cooling layer (5) are S-shaped. One end of the cooling layer (5) is connected to a water inlet pipe, and a water inlet valve (6) is provided on the water inlet pipe. The other end of the cooling layer (5) is connected to a water outlet pipe, and a water outlet valve (7) is provided on the water outlet pipe.

6. The multi-stage impedance composite noise reduction structure for generator set soundproof enclosure as described in claim 5, characterized in that: Below the cooling layer (5) is a metal mesh (22), and metal strips (10) are evenly distributed on the lower surface of the metal mesh (22). The lower end of the metal strips (10) is connected to the bottom of the shell (2). An air vent (9) is also provided in the lower part of the shell (2). An air vent pipe (8) is also connected above the air vent (9). The air vent pipe (8) extends out of the shell (2).

7. The multi-stage impedance composite noise reduction structure for generator set soundproof enclosure as described in claim 1, characterized in that: A drain pipe is connected to the bottom of the housing (2), and a drain valve (25) is provided on the drain pipe. A confluence channel (23) is also provided inside the housing (2). The confluence channel (23) is annular and is fixed to the inner wall of the housing (2).

8. The multi-stage impedance composite noise reduction structure for generator set soundproof enclosure as described in claim 1, characterized in that: The outer side of the housing (2) is also provided with a return pipe (24). The upper end of the return pipe (24) is connected to the upper part of the confluence channel (23) of the housing (2), and the lower end of the return pipe (24) is connected to the lower part of the housing (2). A spray valve (11) and an inlet pressure sensor (27) are also fixedly connected to the upper inner wall of the housing (2), and an outlet pressure sensor (26) is also fixedly connected to the lower inner wall of the housing (2).

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