Exhaust silencer for high-speed centrifugal fan

Abstract

The utility model relates to the field of centrifugal fans, in particular to an exhaust silencer for a high-speed centrifugal fan, which comprises a straight silencer, a threaded connection groove and a silencing component. A silencing assembly used for reducing noise of the high-speed centrifugal machine is installed in the center of the interior of the straight-barrel silencer and comprises an air inlet, a threaded connection groove is formed in the position, located on the outer side of the air inlet, of the surface of the straight-barrel silencer, and the surface of the inner side of the straight-barrel silencer is wrapped with a perforated plate. A plurality of sets of first sound absorption holes used for increasing the propagation path length of sound waves and reducing sound energy are linearly formed in the surface of the perforated plate. According to the exhaust silencer for the high-speed centrifugal fan, due to the application of the multi-layer sound absorption material perforated plate, the fiber plate, the foamed plastic impedance layer and the silencing cotton, the sound energy can be reduced; the silencer can effectively reduce noise generated during operation of the high-speed centrifugal fan, the silencer is easy to mount and dismount due to the design of the threaded connection groove, and meanwhile, the stability of connection with the fan or other equipment is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fans, and in particular to an exhaust silencer for high-speed centrifugal fans. Background Technology

[0002] Compared to ordinary centrifugal fans, high-speed centrifugal fans have higher impeller speeds, typically reaching thousands to tens of thousands of revolutions per minute. This allows them to provide higher airflow and pressure within a relatively small size. The working principle of a high-speed centrifugal fan is to use centrifugal force to expel gas. Gas enters the impeller from the inlet, and as the impeller rotates, the gas is pushed to the outer edge of the impeller by centrifugal force, forming a high-speed airflow. Then, the airflow is compressed by the diffuser between the inlet and outlet, generating a high pressure difference, and finally discharged.

[0003] Irregular airflows in high-speed centrifugal fans, such as eddies, turbulence, or airflow separation, can cause pressure fluctuations and generate noise. Traditional silencers often require the integration of multiple functional components, which demands high coordination between these components, increasing the difficulty of design and production. In order to provide sufficient silence path length, traditional silencers usually have a large volume.

[0004] Therefore, given that the irregular airflow of the aforementioned high-speed centrifugal fan can cause pressure fluctuations and thus generate noise, traditional silencers often require the integration of multiple functional components. The high degree of coordination between these components increases the difficulty of design and production. A silencer can be designed using a multi-layered sound-absorbing material perforated plate, fiberboard, foamed plastic impedance layer, and sound-absorbing cotton. This silencer can effectively reduce the noise generated by the high-speed centrifugal fan during operation. The threaded connection groove design makes the silencer easy to install and disassemble, while ensuring the stability of the connection with the fan or other equipment. Utility Model Content

[0005] To overcome the pressure fluctuations and noise caused by the irregular airflow of high-speed centrifugal fans, traditional silencing structures often require the integration of multiple functional components. The high degree of coordination between these components increases the difficulty of design and production.

[0006] The technical solution of this utility model is as follows: an exhaust silencer for a high-speed centrifugal fan, comprising a straight-cylinder silencer, a threaded connecting groove, and a silencing component; a silencing component for reducing the noise of a high-speed centrifugal fan is installed in the center of the straight-cylinder silencer, the silencing component includes an air inlet, a threaded connecting groove is provided on the surface of the straight-cylinder silencer outside the air inlet, and a perforated plate is provided on the inner surface of the straight-cylinder silencer, and multiple sets of first sound-absorbing holes are linearly opened on the surface of the perforated plate to increase the propagation path length of sound waves and reduce sound energy.

[0007] Preferably, the straight-cylinder silencer is the main structure of the entire silencer. It is designed with special sound-absorbing components inside to reduce the noise from the high-speed centrifugal fan. When the high-speed centrifugal fan is running, the high-pressure airflow generated enters the interior of the straight-cylinder silencer through the air inlet. As the airflow enters the silencer, the accompanying noise also begins to propagate inside the silencer. The first sound-absorbing hole on the perforated plate increases the propagation path length of the sound wave, causing the sound wave to be repeatedly reflected and scattered inside the hole and rubbed against the hole wall, resulting in the sound energy being converted into heat energy and absorbed.

[0008] Preferably, the straight-tube silencer has an air outlet at the end away from the air inlet, and the perforated plate surface is covered with fiberboard.

[0009] Preferably, the inside of the straight-tube muffler has three sets of impedance layers arranged from left to right, and the material of the three sets of impedance layers is foam plastic.

[0010] Preferably, a flow cavity is provided in the center of the impedance layer, and the flow cavity is set to the same size as the air outlet.

[0011] Preferably, the surface of the impedance layer is provided with multiple sets of second sound-absorbing holes, and the second sound-absorbing holes are provided with sound-absorbing cotton.

[0012] Preferably, an airflow guide plate is provided between the two sets of impedance layers, and the airflow guide plate is coaxially arranged with the impedance layers.

[0013] Preferably, the airflow guide plate is surrounded by four sets of connecting plates that are connected to the perforated plate.

[0014] The beneficial effects of this utility model are as follows: Compared with the traditional exhaust silencer for high-speed centrifugal fans, this new model uses a perforated plate to cover the inner surface of the straight-tube silencer, on which multiple sets of first sound-absorbing holes are opened. These holes force the sound waves to reflect and scatter multiple times, thereby consuming sound energy and achieving the effect of noise reduction. The sound waves will continuously reflect between the hole walls, gradually attenuating until they are absorbed by the first sound-absorbing holes. The threaded connection groove connection method not only ensures the ease of installation, but also ensures the stability and sealing of the connection, preventing airflow leakage. Attached Figure Description

[0015] Figure 1 The diagram shown is a schematic representation of the overall structure of an exhaust silencer for a high-speed centrifugal fan according to this utility model.

[0016] Figure 2 The diagram shown is a schematic diagram of the perforated plate structure of an exhaust silencer for a high-speed centrifugal fan according to this utility model.

[0017] Figure 3 The diagram shown is a schematic representation of the impedance layer structure of an exhaust silencer for a high-speed centrifugal fan according to this utility model.

[0018] Figure 4 The diagram shown is a schematic diagram of the airflow guide plate structure of an exhaust silencer for a high-speed centrifugal fan according to this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Straight-cylinder silencer; 2. Threaded connection groove; 301. Air inlet; 302. Air outlet; 303. First sound-absorbing hole; 304. Perforated plate; 305. Impedance layer; 306. Flow cavity; 307. Second sound-absorbing hole; 308. Airflow guide plate; 309. Connecting plate. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please see Figure 1 - Figure 4 This utility model provides an embodiment: an exhaust silencer for a high-speed centrifugal fan, including a straight-cylinder silencer 1, a threaded connecting groove 2, and a silencing component; the straight-cylinder silencer 1 has a silencing component for reducing the noise of the high-speed centrifugal fan installed in its center, the silencing component includes an air inlet 301, the straight-cylinder silencer 1 has a threaded connecting groove 2 on its surface outside the air inlet 301, and the inner surface of the straight-cylinder silencer 1 is covered with a perforated plate 304, the perforated plate 304 has multiple sets of first sound-absorbing holes 303 linearly formed on its surface to increase the propagation path length of sound waves and reduce sound energy, thereby significantly reducing noise.

[0022] Please see Figure 1 - Figure 2 In this embodiment, the straight-tube silencer 1 has an air outlet 302 at the end away from the air inlet 301. The perforated plate 304 is covered with fiberboard. The air outlet 302 at the end of the straight-tube silencer 1 away from the air inlet 301 ensures smooth airflow. This design avoids turbulence or backflow inside the silencer, reduces unnecessary pressure loss, and improves the efficiency of the entire system. The fiberboard covering the perforated plate 304, as a highly efficient sound-absorbing material, further absorbs and attenuates residual noise after passing through the perforated plate 304. The use of fiberboard helps reduce structural vibration caused by airflow, thereby... To reduce potential secondary noise, the straight-tube silencer 1 has three sets of impedance layers 305 arranged from left to right inside. The material of the three sets of impedance layers 305 is foam plastic. As a lightweight material with high porosity, foam plastic can effectively absorb broadband noise. By setting three sets of impedance layers 305, each layer can optimize the absorption of sound waves in different frequency ranges, especially mid-to-high frequency noise, thereby providing a more comprehensive noise reduction effect. Foam plastic has good elasticity and buffering properties, which can effectively reduce structural vibration caused by airflow. The open cell structure of foam plastic allows airflow to pass relatively smoothly, while effectively hindering sound waves.

[0023] Please see Figure 2 - Figure 3 In this embodiment, a flow cavity 306 is formed in the center of the impedance layer 305. The flow cavity 306 is the same size as the air outlet 302. The design of the flow cavity 306 ensures smooth airflow inside the muffler and avoids turbulence or backflow caused by airflow obstruction. By keeping the flow cavity 306 the same size as the air outlet 302, it can effectively prevent the generation of new noise when the airflow passes through the impedance layer 305. The design of the flow cavity 306 ensures uniform distribution of airflow throughout the muffler and avoids local airflow that is too fast or too slow. Multiple sets of second sound-absorbing holes 30 are formed around the surface of the impedance layer 305. 7. The second sound-absorbing hole 307 is internally equipped with sound-absorbing cotton. Together with the internal sound-absorbing cotton, the second sound-absorbing hole 307 forms a multi-layered sound absorption system. When sound waves enter these holes, they are repeatedly reflected, scattered, and rubbed within the sound-absorbing cotton, gradually consuming sound energy. This design is particularly effective in absorbing high-frequency noise because high-frequency sound waves can more easily penetrate small holes and attenuate within the material. By adjusting the size and distribution density of the second sound-absorbing hole 307, its absorption effect on sound waves of different frequencies can be optimized. The design of the second sound-absorbing hole 307 allows airflow to remain relatively smooth when passing through the impedance layer 305, reducing pressure loss caused by airflow obstruction.

[0024] Please see Figure 3 - Figure 4 In this embodiment, an airflow guide plate 308 is provided between the two sets of impedance layers 305. The airflow guide plate 308 is coaxially arranged with the impedance layer 305. The function of the airflow guide plate 308 is to guide the airflow to be evenly distributed inside the muffler, avoiding the airflow from concentrating in certain areas and causing local pressure to be too high or too low. The uniform airflow distribution not only improves the working efficiency of all sound-absorbing components, but the airflow guide plate 308 also ensures that the airflow path is smoother and more stable when passing through the impedance layer 305, reducing the occurrence of turbulence. The design of the airflow guide plate 308 makes the airflow path inside the muffler more tortuous and complex. The airflow guide plate 308 is surrounded by four sets of connecting plates 309 that are connected to the perforated plate 304. The four sets of connecting plates 309 firmly connect the airflow guide plate 308 to the perforated plate 304, enhancing the stability of the entire internal structure of the silencer. This not only prevents the airflow guide plate 308 from shifting or deforming under the impact of high-speed airflow, but also improves the mechanical strength of the entire device, ensuring its reliability and durability during long-term operation. The design of the connecting plates 309 helps to guide the airflow more accurately through the space between the airflow guide plate 308 and the impedance layer 305.

[0025] During operation, a straight-tube silencer 1 is added to the tail of the vent pipe. The silencer is securely connected to the fan or pipeline using a threaded connection groove 2. When the high-speed centrifugal fan is running, the high-pressure airflow generated enters the interior of the straight-tube silencer 1 through the air inlet 301. As the airflow enters the silencer, the accompanying noise also begins to propagate inside the silencer. The first sound-absorbing hole 303 on the perforated plate 304 increases the propagation path length of the sound wave, causing the sound wave to be repeatedly reflected and scattered inside the hole and rubbed against the hole wall, resulting in the sound energy being converted into heat energy and absorbed.

[0026] Through the above steps, the application of multi-layer sound-absorbing perforated plate 304, fiberboard, foamed plastic impedance layer 305, and sound-absorbing cotton has been addressed. This silencer can effectively reduce the noise generated by high-speed centrifugal fans during operation. The optimized airflow path design ensures uniform airflow distribution inside the silencer, reducing unnecessary airflow resistance and thus improving the efficiency of the entire system. This not only contributes to energy saving but also extends the service life of the fan and other related equipment. The design of the threaded connection groove 2 makes the silencer easy to install and disassemble, while ensuring the stability of the connection with the fan or other equipment. It solves the problem that irregular airflow from high-speed centrifugal fans can cause pressure fluctuations, which in turn generate noise. Traditional silencer structures often require the integration of multiple functional components, and the coordination between these components is highly demanding, increasing the difficulty of design and production.

Claims

1. An exhaust silencer for a high-speed centrifugal fan, comprising a straight-tube silencer (1); characterized in that: It also includes a threaded connection groove (2) and a silencing component; the straight-tube silencer (1) has a silencing component installed in the center inside to reduce the noise of the high-speed centrifuge. The silencing component includes an air inlet (301). The straight-tube silencer (1) has a threaded connection groove (2) on the outside of the air inlet (301). The inner surface of the straight-tube silencer (1) is covered with a perforated plate (304). The perforated plate (304) has multiple sets of first sound-absorbing holes (303) linearly opened on its surface to increase the propagation path length of the sound wave and reduce the sound energy.

2. The exhaust silencer for a high-speed centrifugal fan according to claim 1, characterized in that: The straight-tube silencer (1) has an air outlet (302) at the end away from the air inlet (301), and the surface of the perforated plate (304) is covered with fiberboard.

3. The exhaust silencer for a high-speed centrifugal fan according to claim 1, characterized in that: The straight-tube muffler (1) has three sets of impedance layers (305) arranged from left to right inside, and the material of the three sets of impedance layers (305) is foam plastic.

4. The exhaust silencer for a high-speed centrifugal fan according to claim 3, characterized in that: A flow cavity (306) is provided in the center of the impedance layer (305), and the flow cavity (306) is the same size as the air outlet (302).

5. The exhaust silencer for a high-speed centrifugal fan according to claim 3, characterized in that: Multiple sets of second sound-absorbing holes (307) are opened around the surface of the impedance layer (305), and sound-absorbing cotton is provided inside the second sound-absorbing holes (307).

6. The exhaust silencer for a high-speed centrifugal fan according to claim 3, characterized in that: An airflow guide plate (308) is provided between the two sets of impedance layers (305), and the airflow guide plate (308) is coaxially arranged with the impedance layer (305).

7. The exhaust silencer for a high-speed centrifugal fan according to claim 6, characterized in that: Four sets of connecting plates (309) connected to the perforated plate (304) are installed around the outside of the airflow guide plate (308).

Images