Sheet-type impedance composite silencer
By introducing resistive and reactive sections into the plate-type impedance composite silencer, and setting non-uniform through holes and filling the cavity with sound-absorbing material on the silencer plate, the problem of low-frequency noise elimination by the plate-type resistive silencer is solved, achieving efficient noise reduction and smooth fluid flow over a wide frequency range.
Patent Information
- Application Number
- CN202520167928.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-01-24
AI Technical Summary
Existing plate resistive silencers have low absorption coefficients for low-frequency noise, making it difficult to effectively eliminate low-frequency noise from large axial and centrifugal compressor units. This causes noise to propagate outwards from the high-level air inlet, resulting in significant impact.
The design incorporates a plate-type impedance composite silencer, with the sound-absorbing plate inside the cylinder divided into resistive and reactive sections. The resistive section is used to eliminate low-frequency noise, while the reactive section is used to eliminate mid- and high-frequency noise. Non-uniform through holes and cavities filled with sound-absorbing material are set on the sound-absorbing plate to reduce noise through resonance and absorption mechanisms.
It significantly reduces the noise level of the compressor unit, especially low-frequency noise, and improves the noise reduction effect over a wide frequency range, ensuring smooth fluid flow and efficient system operation.
Smart Images
Figure CN223621869U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of noise reduction technology, specifically to a plate-type impedance composite silencer. Background Technology
[0002] Large axial and centrifugal compressor units in the chemical and oil refining industries typically generate noise levels between 100 dB(A) and 150 dB(A) due to their large air volume, high air pressure, and high rotational speed. The noise spectrum is broadband, with high noise levels across a frequency range from 100 Hz to 2000 Hz. Conventional designs include plate-type resistive silencers on the compressor unit's inlet and outlet pipes. These silencers typically use sound-absorbing glass wool as the sound-absorbing material. A frame is constructed from thin steel plates pressed into channel steel and welded together. The frame is filled with glass wool wrapped in fiberglass cloth to prevent the sound-absorbing glass wool from being sucked out. Perforated metal plates are welded to both sides of the frame as a boundary layer. The silencer plates are evenly placed at intervals in the airflow duct. When airflow noise passes between the silencer plates, the noise wave enters the sound-absorbing glass wool through the perforated plates, causing the glass wool to vibrate and rub, thus consuming noise energy and achieving noise reduction. Plate-type resistive silencers have the advantages of good mid-to-high frequency sound absorption and low resistance loss, and are therefore widely used.
[0003] With increasingly stringent environmental protection requirements, plate-type resistive silencers have a low absorption coefficient for low-frequency noise and are almost ineffective against low-frequency noise below 250Hz. Even if cavity tube reactive silencers, which are effective at reducing low-frequency noise, are used, their high resistance loss and low air volume mean they are rarely used in the actual application of large axial and centrifugal compressor units. Furthermore, the air inlets of large axial and centrifugal compressor units are designed at high positions (to ensure air cleanliness), and plate-type resistive silencers cannot effectively eliminate low-frequency noise. As a result, the low-frequency noise from the high air inlets of the compressor unit propagates from high up to the surrounding areas.
[0004] However, low-frequency noise has the characteristics of long-distance propagation and slow attenuation with distance, resulting in a significant impact on the surrounding environment and making it relatively difficult to eliminate. Therefore, this invention proposes a plate-type impedance composite silencer to improve the above-mentioned problems. Utility Model Content
[0005] Therefore, the technical problem to be solved by this utility model is to overcome the defect of the existing plate impedance composite silencer in that it is difficult to eliminate low frequency noise, thereby providing a plate impedance composite silencer.
[0006] To solve the above problems, this utility model provides a plate-type impedance composite silencer, which includes: a cylindrical body, wherein the top and bottom of the cylindrical body are respectively provided with an upper connection port and a lower connection port;
[0007] At least three sets of sound-absorbing plates are evenly arranged along the radial direction of the cylinder, and channels are formed between the sound-absorbing plates and the inner wall of the cylinder.
[0008] The silencing plate includes a resistive section and a reactive section. The resistive section is used to eliminate low-frequency noise, and the reactive section is used to eliminate mid- and high-frequency noise.
[0009] Preferably, the cylinder is provided with an upper reducing pipe and a lower reducing pipe near the top and bottom, respectively.
[0010] Preferably, eight sound-absorbing plates are evenly arranged along the radial direction of the cylinder, and the two ends of the eight sound-absorbing plates are respectively connected to the inner sidewall of the cylinder;
[0011] Support plates are respectively provided near the top and bottom of the silencing plate, and the two support plates abut against the top and bottom of the silencing plate respectively. The two ends of the support plates are connected to the inner sidewall of the cylinder, and a gap is provided between the two sides of the support plates and the inner sidewall of the cylinder.
[0012] Preferably, the resistive section includes: four first cavities, which are distributed vertically at one end of the sound-absorbing plate near the upper connection port, and the first cavities are filled with sound-absorbing material.
[0013] Preferably, a plurality of first through holes are respectively provided on both sides of the sound-absorbing plate near the first cavity, and the distribution area of the first through holes occupies 30% of the area of the sound-absorbing plate near the first cavity.
[0014] Preferably, the resistant section includes: four second cavities, which are distributed vertically at one end of the sound-absorbing plate near the lower connection port, with the uppermost second cavity being close to the first cavity, and the four second cavities having different volumes;
[0015] Several second through holes are respectively provided on both sides of the sound-absorbing plate near the second cavity.
[0016] Preferably, the spacing between each second through hole and the adjacent second through hole is different, and the diameter of each second through hole and the adjacent second through hole is different.
[0017] Preferably, the sound-absorbing plate has sharp ends at both ends.
[0018] The plate-type impedance composite silencer provided by this utility model has the following beneficial effects:
[0019] 1. This utility model connects the compressor unit inlet pipeline to the lower connection port of the housing. Air enters the housing from the upper connection port and then enters the compressor unit. The compressor unit noise is caused by the compressor inlet pipeline flowing in the opposite direction from the lower connection port of the housing. The noise sound waves flow upward through the channel between the sound-absorbing plate and the inner wall of the cylinder. The resistive section of the sound-absorbing plate resonates and reduces noise, eliminating mid- and high-frequency noise. Then, it continues upward along the channel and eliminates low-frequency noise through the resistive section of the sound-absorbing plate.
[0020] 2. This utility model also fills each first cavity with high-quality sound-absorbing glass wool. The sound-absorbing glass wool has excellent sound absorption performance and good thermal stability, which can effectively absorb and reduce the sound wave energy transmitted through the sound-absorbing plate, thereby significantly reducing the noise level.
[0021] 3. This utility model also utilizes a non-uniform hole spacing design for the second through hole to help break the laws of sound wave propagation and reduce the resonance effect of sound waves inside the sound-absorbing plate, thereby further improving the noise reduction effect. The differential hole diameter design of the second through hole is designed to better adapt to sound waves of different frequencies, enabling the sound-absorbing plate to achieve efficient sound absorption and sound insulation functions in a wider frequency range. Smaller hole diameters help absorb high-frequency sound waves, while larger hole diameters are more conducive to the dissipation of low-frequency sound waves. Through such precise hole diameter control, the sound-absorbing plate can provide customized acoustic treatment for sound waves of different frequencies, achieving a more accurate and comprehensive noise reduction effect. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of this utility model;
[0023] Figure 2 This is a schematic diagram of the first through-hole structure of this utility model.
[0024] Figure 3 This is a schematic diagram of the installation of the support plate structure of this utility model.
[0025] The reference numerals in the attached figures are as follows:
[0026] 1. Cylinder body; 2. Silencing plate; 3. Upper reducer; 4. Lower reducer; 5. Support plate; 6. First cavity; 7. Sound-absorbing material; 8. First through hole; 9. Second cavity; 10. Second through hole; 11. Sharp end. Detailed Implementation
[0027] like Figure 1-3 As shown, this utility model provides a plate-type impedance composite silencer, which includes:
[0028] The cylinder 1 has an upper connecting port and a lower connecting port at its top and bottom, respectively.
[0029] At least three sets of sound-absorbing plates 2 are evenly arranged along the radial direction of the cylinder 1, and channels are formed between the sound-absorbing plates 2 and the inner sidewall of the cylinder 1 respectively;
[0030] The silencing plate 2 includes a resistive section and a reactive section. The resistive section is used to eliminate low-frequency noise, and the reactive section is used to eliminate mid- and high-frequency noise. Figure 1-3 As shown, the plate-type impedance composite silencer has cover plates installed at the upper and lower connection ports on the top of the cylinder 1. The cover plates can be connected to the upper and lower connection ports by flange connection, bolt connection, or snap-fit. When in use, the compressor unit inlet pipeline is connected to the lower connection port of the shell. Air enters the shell from the upper connection port and then enters the compressor unit. The compressor unit noise enters the shell from the lower connection port of the shell in the reverse direction. The noise wave passes through the channel between the silencer plate 2 and the inner wall of the cylinder 1 and goes upward. The channel is formed by the connection between two adjacent silencer plates and the inner wall of the cylinder, as well as the silencer plate and the inner wall of the cylinder. The reactive section of the silencer plate 2 resonates and reduces noise, eliminating mid- and high-frequency noise. Then, it continues to go upward along the channel and eliminates low-frequency noise through the resistive section of the silencer plate 2.
[0031] In some embodiments, the cylinder 1 is provided with an upper reducing pipe 3 and a lower reducing pipe 4 near its top and bottom, respectively. For example... Figure 1-3 As shown, the upper reducer 3 and lower reducer 4 at the top and bottom of the cylinder 1 effectively regulate the flow velocity and pressure distribution of the fluid in the cylinder 1, thereby ensuring the smooth operation and high efficiency of the entire system. The upper reducer 3 is located near the top of the cylinder 1 to adapt to the diameter change requirements when connecting with the upper pipes or equipment; while the lower reducer 4 is set around the bottom of the cylinder 1 to facilitate matching and connection with the conveying system or storage facilities below.
[0032] In some embodiments, eight silencing plates 2 are evenly arranged along the radial direction of the cylinder 1, and both ends of the eight silencing plates 2 are respectively connected to the inner sidewall of the cylinder 1; support plates 5 are respectively arranged near the top and bottom of the silencing plates 2, with two support plates 5 abutting against the top and bottom of the silencing plates 2 respectively, and both ends of the support plates 5 are connected to the inner sidewall of the cylinder 1, with gaps between the two sides of the support plates 5 and the inner sidewall of the cylinder 1. Figure 1-3As shown, eight silencers 2 are evenly arranged along the radial direction of the cylinder 1, forming nine channels between the eight silencers 2 and the inner wall of the cylinder 1. The two ends of the silencers 2 are connected to the inner wall of the cylinder 1 by means of bolting, welding or snap-fitting. The top and bottom of the silencers 2 are supported by support plates 5, which keep them between the inner wall of the cylinder 1. The connection between the support plates 5 and the inner wall of the cylinder 1 can be by bonding, bolting or welding. The gap between the two sides of the support plates 5 and the inner wall of the cylinder 1 can ensure the flow of fluid.
[0033] In some embodiments, the resistive section includes four first cavities 6, which are distributed vertically at one end of the sound-absorbing plate 2 near the upper connection port, and the first cavities 6 are filled with sound-absorbing material 7. For example... Figure 1-3 As shown, the four first cavities 6 are not interconnected and are distributed vertically in the cylinder 1, forming an orderly and efficient acoustic treatment area. The sound-absorbing material is sound-absorbing glass wool, and each first cavity 6 is filled with high-quality sound-absorbing glass wool, which is commercially available. Sound-absorbing glass wool has excellent sound absorption performance and good thermal stability, and can effectively absorb and reduce the sound wave energy transmitted through the sound-absorbing plate 2, thereby significantly reducing the noise level and improving the overall acoustic environment quality. The filling of the sound-absorbing glass wool in the first cavity 6 not only ensures effective sound absorption, but also increases the damping of sound waves during propagation through its unique fiber structure, further reducing sound reflection and propagation.
[0034] In some embodiments, a plurality of first through holes 8 are respectively provided on both sides of the sound-absorbing plate 2 near the first cavity 6, and the distribution area of the first through holes 8 occupies 30% of the area of the sound-absorbing plate 2 near the first cavity 6. For example... Figure 1-3 As shown, the first through hole 8 facilitates the entry of noise, allowing it to be absorbed by the first cavity 6. The distribution area of the first through hole 8 occupies 30% of the area of the sound-absorbing plate 2 near the first cavity 6, which can balance the effective conduction and absorption of sound. The first through hole 8 also promotes the interaction of noise between the first cavity 6 and the outside of the sound-absorbing plate 2, enhancing the sound absorption capacity of the sound-absorbing glass wool. At the same time, the reasonable control of the number and distribution of through holes avoids excessive noise leakage, ensuring that the sound-absorbing plate 2 can maintain a certain degree of air permeability while reducing noise, avoiding the problem of poor air circulation caused by sealing.
[0035] In some embodiments, the resistant section includes: four second cavities 9, which are distributed vertically at one end of the silencing plate 2 near the lower connection port, with the uppermost second cavity 9 close to the first cavity 6; the four second cavities 9 have different sizes; and several second through holes 10 are respectively provided on both sides of the silencing plate 2 near the second cavities 9. Figure 1-3 As shown, four second cavities 9 are arranged vertically on the cylinder 1 near the lower connection port. The four second cavities 9 are not interconnected. The four first cavities 6 and the four second cavities 9 are arranged sequentially on the sound-absorbing plate 2, and the first cavities 6 and the second cavities 9 are not interconnected. The second cavities 9 have different volumes. Through the cavity structure with different volumes, different frequencies of sound waves can be dealt with more effectively, and a more comprehensive and detailed noise reduction effect can be achieved. The presence of the second through hole 10 not only provides an additional propagation channel for sound waves, but also promotes air exchange between the inside of the second cavity 9 and the external environment, which helps to maintain air circulation inside the sound-absorbing plate 2 and prevents the acoustic performance from deteriorating due to the closed structure.
[0036] In some embodiments, the spacing between each second through hole 10 and its adjacent counterparts is different, and the diameter of each second through hole 10 is different from that of its adjacent counterparts. For example... Figure 1-3 As shown, the non-uniform hole spacing design of the second through hole 10 helps to break the law of sound wave propagation and reduce the resonance effect of sound waves inside the sound-absorbing plate 2, thereby further improving the noise reduction effect. The differential hole diameter design of the second through hole 10 is designed to better adapt to sound waves of different frequencies, enabling the sound-absorbing plate 2 to achieve efficient sound absorption and sound insulation functions in a wider frequency range. Smaller hole diameters help absorb high-frequency sound waves, while larger hole diameters are more conducive to the dissipation of low-frequency sound waves. Through such precise hole diameter control, the sound-absorbing plate 2 can provide customized acoustic treatment for sound waves of different frequencies, achieving a more accurate and comprehensive noise reduction effect.
[0037] In some embodiments, the sound-absorbing plate 2 has sharp ends 11 at both ends. For example... Figure 1-3 As shown, one purpose is to facilitate the installation of the sound-absorbing plate on the support plate, and the setting of the sharp end 11 serves as a guide, which can promote its smooth flow into the channel between the sound-absorbing plates 2.
[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. A plate-type impedance composite silencer, characterized in that, include: A cylindrical body, wherein an upper connection port and a lower connection port are respectively provided at the top and bottom of the cylindrical body; At least three sets of sound-absorbing plates are evenly arranged along the radial direction of the cylinder, and channels are formed between the sound-absorbing plates and the inner wall of the cylinder. The silencing plate includes a resistive section and a reactive section. The resistive section is used to eliminate low-frequency noise, and the reactive section is used to eliminate mid- and high-frequency noise.
2. The plate-type impedance composite silencer according to claim 1, characterized in that: The cylinder is provided with an upper reducing pipe and a lower reducing pipe near the top and bottom, respectively.
3. The plate-type impedance composite silencer according to claim 1, characterized in that: The sound-absorbing plates are evenly arranged in eight directions along the radial direction of the cylinder, and the two ends of the eight sound-absorbing plates are respectively connected to the inner sidewall of the cylinder. Support plates are respectively provided near the top and bottom of the silencing plate, and the two support plates abut against the top and bottom of the silencing plate respectively. The two ends of the support plates are connected to the inner sidewall of the cylinder, and a gap is provided between the two sides of the support plates and the inner sidewall of the cylinder.
4. The plate-type impedance composite silencer according to claim 3, characterized in that: The resistive section includes four first cavities, which are distributed vertically at one end of the sound-absorbing plate near the upper connection port, and the first cavities are filled with sound-absorbing material.
5. The plate-type impedance composite silencer according to claim 4, characterized in that: The sound-absorbing plate has several first through holes on both sides near the first cavity, and the distribution area of the first through holes occupies 30% of the area of the sound-absorbing plate near the first cavity.
6. The plate-type impedance composite silencer according to claim 4, characterized in that: The resistance section includes: four second cavities, which are distributed vertically at one end of the sound-absorbing plate near the lower connection port, with the uppermost second cavity being close to the first cavity, and the four second cavities having different volumes; Several second through holes are respectively provided on both sides of the sound-absorbing plate near the second cavity.
7. The plate-type impedance composite silencer according to claim 6, characterized in that: The spacing between each second through hole and its adjacent second through hole is different, and the diameter of each second through hole and its adjacent second through hole is different.
8. The plate-type impedance composite silencer according to claim 1, characterized in that: The sound-absorbing plate has sharp ends at both ends.