A low back pressure multi-stage sound-attenuated generator set exhaust system
Patent Information
- Application Number
- CN202522481640.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-24
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-11-24
AI Technical Summary
目前，常见的发电机组排气消音装置主要分为抗性消音器和阻性消音器两类，抗性消音器用于消除噪音中的低频脉动，阻性消音器用于消除中高频噪音，现有技术中出现了将抗性与阻性结构简单串联的多级消音系统，然而，这种系统往往只是功能的叠加，缺乏对整体气流组织的优化，抗性消音舱出口的气流通常紊乱且充满涡流，若直接进入阻性消音舱，会剧烈冲刷吸声材料，不仅加速其失效，还会在两级连接处产生显著的局部阻力，进一步推高整个系统的背压
1.发电机组的排气进入一级抗性消音机构的第一消音管内，在第一消音孔的作用下，气流进入对应的消音腔内，声波遇到截面突然变化的扩张室，会发生反射、折射和干涉，低频脉动的声能因相位抵消被削弱，从而实现消声，且带孔的消音板使得相邻的消音腔构成亥姆霍兹共振器，当入射声波频率与共振器的固有频率一致时，小孔处的空气柱会剧烈振动，通过摩擦和阻尼耗散大量声能，尤其对低频噪声有显著消声效果，且一级抗性消音机构中设计的气流通道顺畅，使得整体结构在实现消声功能的同时，未对气流形成过多阻碍，因此气流通过时的背压（阻力）较低，从而降低背压。
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Figure CN224919332U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of generator set exhaust, and in particular to a low back pressure multi-stage silencing generator set exhaust system. Background Technology
[0002] Generator sets, as an important backup or primary power source, are widely used in data centers, hospitals, factories, and buildings. Their core power source—the diesel or gas engine—generates high-intensity, wide-bandgap exhaust noise during operation, severely polluting the surrounding environment. To meet increasingly stringent environmental regulations, efficient mufflers must be installed in the exhaust system. Currently, common generator set exhaust silencing devices are mainly divided into two categories: reactive silencers and resistive silencers. Reactive silencers are used to eliminate low-frequency pulsations in noise, while resistive silencers are used to eliminate mid-to-high frequency noise. Existing technologies have developed multi-stage silencing systems that simply connect reactive and resistive structures in series. However, such systems are often just functional superpositions and lack optimization of the overall airflow organization. The airflow at the outlet of the reactive silencer chamber is usually turbulent and full of eddies. If it directly enters the resistive silencer chamber, it will violently erode the sound-absorbing material, not only accelerating its failure but also generating significant local resistance at the connection between the two stages, further increasing the back pressure of the entire system. Utility Model Content
[0003] (a) Technical problems to be solved To address the aforementioned problems in the prior art, this utility model provides a generator set exhaust system with low back pressure and multi-stage silencing.
[0004] (II) Technical Solution To achieve the above objectives, the main technical solutions adopted by this utility model include: A generator exhaust system with low back pressure and multi-stage silencing includes a first-stage reactive silencing mechanism, a second-stage flow stabilizing and guiding mechanism, and a third-stage resistive silencing mechanism. The primary resistance silencing mechanism includes a primary silencing chamber, a first silencing pipe, and a silencing plate; Multiple silencing plates are provided and installed at equal intervals in the primary silencing chamber, dividing the interior of the primary silencing chamber into multiple silencing cavities. The first silencing pipe is coaxially arranged with the primary silencing chamber, and the silencing plates are provided with silencing holes corresponding to the first silencing pipe. Both ends of the first silencing pipe extend out of the primary silencing chamber. Several first silencing holes are evenly distributed on the pipe body of the first silencing pipe located in the primary silencing chamber. Multiple funnel-shaped tube-constricting structures are provided inside the first silencing pipe, and the tube-constricting structures correspond one-to-one with the silencing cavities. One end of the secondary flow stabilizing and guiding mechanism is connected to the primary resistive silencing mechanism, and the other end of the secondary flow stabilizing and guiding mechanism is connected to the tertiary resistive silencing mechanism; The three-stage resistive silencing mechanism is used for silencing medium and high frequency noise.
[0005] Preferably, the secondary flow stabilization and guiding mechanism includes a flow stabilization chamber, a flow guide cone, and a tapered tube. One end of the flow stabilization chamber is connected to and communicates with the first silencer pipe. The other end of the flow stabilization chamber is connected to the tertiary resistive silencer mechanism through the tapered tube. The flow guide cone is installed in the flow stabilization chamber by a support rod, and the tip of the flow guide cone is aligned with the outlet of the first silencer pipe.
[0006] Preferably, the three-stage resistive silencing mechanism includes a three-stage silencing chamber, a second silencing pipe, and porous sound-absorbing filler. The second silencer pipe is installed inside the third-stage silencer chamber, and both ends of the second silencer pipe extend out of the third-stage silencer chamber. The pipe body of the second silencer pipe located inside the third-stage silencer chamber has a number of second silencer holes evenly distributed on it. The porous sound-absorbing filler fills the third-stage silencer chamber.
[0007] Preferably, the porous sound-absorbing filler is one or more of rock wool, stainless steel fiber wool, or stainless steel fiber wool.
[0008] (III) Beneficial Effects The beneficial effects of this utility model are as follows: 1. The exhaust gas from the generator set enters the first silencer pipe of the first-stage reactive silencer mechanism. Under the action of the first silencer hole, the airflow enters the corresponding silencer cavity. When the sound wave encounters the expansion chamber with a sudden change in cross-section, reflection, refraction, and interference will occur. The low-frequency pulsating sound energy is weakened due to phase cancellation, thereby achieving noise reduction. Furthermore, the perforated silencer plate makes the adjacent silencer cavities form a Helmholtz resonator. When the frequency of the incident sound wave is consistent with the natural frequency of the resonator, the air column at the small hole will vibrate violently, dissipating a large amount of sound energy through friction and damping. It has a significant noise reduction effect, especially on low-frequency noise. Moreover, the airflow channel designed in the first-stage reactive silencer mechanism is smooth, so that the overall structure does not create too much obstruction to the airflow while achieving the noise reduction function. Therefore, the back pressure (resistance) when the airflow passes through is low, thereby reducing the back pressure.
[0009] 2. After the exhaust gas is treated by the first-stage resistive silencing mechanism, it enters the flow stabilization chamber and is met by a guide cone. The airflow is guided by the guide cone and evenly fills the flow stabilization chamber. Then it flows smoothly into the converging tube. In the converging tube, the airflow is steadily accelerated and enters the third-stage resistive silencing mechanism with a uniform flow rate and low turbulence. The second-stage flow stabilization and guiding mechanism provides a uniform and stable inlet flow field, avoiding the severe scouring of the sound-absorbing material by local high-speed airflow. This maintains the low flow resistance state of the initial design for a long time and ensures the durability of the low back pressure effect. 3. The sound waves enter the third-stage silencing chamber through the second silencing pipe. Using porous sound-absorbing filler, when the sound waves enter the material, the sound energy is converted into heat energy by friction and viscous resistance, thereby achieving the silencing of medium and high frequency noise. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the exhaust system of a generator set with low back pressure and multi-stage noise reduction. Figure 2 This is a schematic diagram of the internal structure of an exhaust system for a low-back-pressure, multi-stage silencing generator set.
[0011] [Explanation of Labels in the Attached Image] 1. Primary resistance noise reduction mechanism 11. Primary silencing chamber; 12. Silencer plate; 13. First silencing pipe; 14. Tube reduction structure; 2. Secondary flow stabilization and diversion mechanism; 21. Flow stabilizer; 22. Converging tube; 23. Flow guide cone; 24. Support rod; 3. Three-stage resistive silencing mechanism; 31. Three-stage silencing chamber; 32. Second silencing pipe; 33. Porous sound-absorbing filler. Detailed Implementation
[0012] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0013] Please refer to Figures 1 to 2 This utility model provides a generator set exhaust system with low back pressure and multi-stage silencing, including a first-stage resistive silencing mechanism 1, a second-stage flow stabilizing and guiding mechanism 2, and a third-stage resistive silencing mechanism 3; The primary resistance silencing mechanism 1 includes a primary silencing chamber 11, a first silencing pipe 13, and a silencing plate 12; Multiple silencing plates 12 are installed at equal intervals inside the primary silencing chamber 11, dividing the interior of the primary silencing chamber 11 into multiple silencing cavities. The first silencing pipe 13 is coaxially arranged with the primary silencing chamber 11, and the silencing plate 12 has silencing holes corresponding to the first silencing pipe 13. Both ends of the first silencing pipe 13 extend out of the primary silencing chamber 11. Several first silencing holes are evenly distributed on the pipe body of the first silencing pipe 13 inside the primary silencing chamber 11. Multiple funnel-shaped tube-shrinking structures 14 are provided inside the first silencing pipe 13, and the tube-shrinking structures 14 correspond one-to-one with the silencing cavities. One end of the secondary flow stabilizing and guiding mechanism 2 is connected to the primary resistive silencing mechanism 1, and the other end of the secondary flow stabilizing and guiding mechanism 2 is connected to the tertiary resistive silencing mechanism 3; The three-stage resistive silencing mechanism 3 is used for silencing medium and high frequency noise; In use, the exhaust of the generator set enters the first silencer pipe 13 of the first-stage reactive silencer mechanism 1. Under the action of the first silencer hole, the airflow enters the corresponding silencer cavity. When the sound wave encounters the expansion chamber with a sudden change in cross-section, it will be reflected, refracted and interfered. The low-frequency pulsating sound energy is weakened due to phase cancellation, thereby achieving noise reduction. Moreover, the perforated silencer plate 12 makes the adjacent silencer cavities form a Helmholtz resonator. When the frequency of the incident sound wave is consistent with the natural frequency of the resonator, the air column at the small hole will vibrate violently, dissipating a large amount of sound energy through friction and damping. It has a significant noise reduction effect, especially on low-frequency noise. Furthermore, the airflow channel designed in the first-stage reactive silencer mechanism 1 is smooth, so that the overall structure does not obstruct the airflow too much while achieving the noise reduction function. Therefore, the back pressure (resistance) when the airflow passes through is low, thereby reducing the back pressure.
[0014] In this embodiment, the secondary flow stabilization and guiding mechanism 2 includes a flow stabilization chamber 21, a flow guide cone 23, and a tapering tube 22. One end of the flow stabilization chamber 21 is connected to and communicates with the first silencer tube 13. The other end of the flow stabilization chamber 21 is connected to the tertiary resistive silencer mechanism 3 through the tapering tube 22. The flow guide cone 23 is installed in the flow stabilization chamber 21 through a support rod 24, and the tip of the flow guide cone 23 is aligned with the outlet of the first silencer tube 13. In use, the exhaust gas treated by the first-stage resistive silencing mechanism 1 enters the flow stabilization chamber 21 and encounters a guide cone 23, which guides the airflow to fill the flow stabilization chamber 21 evenly. Then, it flows smoothly into the converging tube 22. In the converging tube 22, the airflow is smoothly accelerated and enters the third-stage resistive silencing mechanism 3 with a uniform flow rate and low turbulence. The second-stage flow stabilization and guiding mechanism 2 provides a uniform and stable inlet flow field, avoiding the severe scouring of the sound-absorbing material by local high-speed airflow. This maintains the low flow resistance state of the initial design for a long time and ensures the durability of the low back pressure effect.
[0015] In this embodiment, the three-stage resistive silencing mechanism 3 includes a three-stage silencing chamber 31, a second silencing pipe 32, and a porous sound-absorbing filler 33; The second silencer pipe 32 is installed inside the third-level silencer chamber 31, and both ends of the second silencer pipe 32 extend out of the third-level silencer chamber 31. The pipe body of the second silencer pipe 32 inside the third-level silencer chamber 31 is evenly distributed with several second silencer holes, and the porous sound-absorbing filler 33 is filled inside the third-level silencer chamber 31. Preferably, the porous sound-absorbing filler 33 is one or more of rock wool, stainless steel fiber wool, or stainless steel fiber wool; In use, sound waves enter the third-stage silencing chamber 31 through the second silencing pipe 32. Using the porous sound-absorbing filler 33, when the sound waves enter the material, the sound energy is converted into heat energy by friction and viscous resistance, thereby achieving the silencing of medium and high frequency noise.
[0016] Based on the above solution, a generator exhaust system is provided that can handle low, medium and high frequency noise and reduce back pressure.
[0017] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.
[0018] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.
[0019] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A low-back-pressure multi-stage silencing generator exhaust system, characterized in that, It includes a primary resistive silencing mechanism, a secondary flow stabilizing and guiding mechanism, and a tertiary resistive silencing mechanism; The primary resistance silencing mechanism includes a primary silencing chamber, a first silencing pipe, and a silencing plate; Multiple silencing plates are provided and installed at equal intervals in the primary silencing chamber, dividing the interior of the primary silencing chamber into multiple silencing cavities. The first silencing pipe is coaxially arranged with the primary silencing chamber, and the silencing plates are provided with silencing holes corresponding to the first silencing pipe. Both ends of the first silencing pipe extend out of the primary silencing chamber. Several first silencing holes are evenly distributed on the pipe body of the first silencing pipe located in the primary silencing chamber. Multiple funnel-shaped tube-constricting structures are provided inside the first silencing pipe, and the tube-constricting structures correspond one-to-one with the silencing cavities. One end of the secondary flow stabilizing and guiding mechanism is connected to the primary resistive silencing mechanism, and the other end of the secondary flow stabilizing and guiding mechanism is connected to the tertiary resistive silencing mechanism; The three-stage resistive silencing mechanism is used for silencing medium and high frequency noise.
2. The low back pressure multi-stage silencing generator exhaust system according to claim 1, characterized in that, The secondary flow stabilization and guiding mechanism includes a flow stabilization chamber, a flow guide cone, and a tapered tube. One end of the flow stabilization chamber is connected to and communicates with the first silencer pipe. The other end of the flow stabilization chamber is connected to the tertiary resistive silencer mechanism through the tapered tube. The flow guide cone is installed in the flow stabilization chamber by a support rod, and the tip of the flow guide cone is aligned with the outlet of the first silencer pipe.
3. The low back pressure multi-stage silencing generator exhaust system according to claim 1, characterized in that, The three-stage resistive silencing mechanism includes a three-stage silencing chamber, a second silencing pipe, and porous sound-absorbing filler. The second silencer pipe is installed inside the third-stage silencer chamber, and both ends of the second silencer pipe extend out of the third-stage silencer chamber. The pipe body of the second silencer pipe located inside the third-stage silencer chamber has a plurality of second silencer holes evenly distributed on it. The porous sound-absorbing filler fills the third-stage silencer chamber.
4. The low back pressure multi-stage silencing generator exhaust system according to claim 3, characterized in that, The porous sound-absorbing filler is one or more of rock wool, stainless steel fiber cotton, or stainless steel fiber cotton.