Impedance combined silencer structure
By designing impedance combined with silencer structure, using the expansion structure, multiple bent slewing channels and sound-absorbing cotton, the existing silencers have insufficient processing of medium and high frequency and medium and low frequency noise, achieving better silence effect and noise reduction performance.
Patent Information
- Application Number
- CN202422295296.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-20
AI Technical Summary
It is difficult for existing mufflers to effectively handle medium and high frequency and medium and low frequency noise at the same time, and traditional resistive mufflers lack the effect in the processing of medium and low frequency noise.
An impedance combined with silencer structure is designed, including an intake silence chamber and an outlet silence chamber. It is equipped with sound absorbing cotton inside, which is connected through the slewing cover plate to form an expanded structure and a multiple bent silence channel. Combined with the sound absorbing cotton and a through hole, the sound absorbing mechanism of multiple reflections and friction silence of airflow.
It realizes effective sound silencing of medium and low frequency and medium and high frequency noise, and the airflow is more stable, reducing noise and vibration, and improving noise reduction performance.
Smart Images
Figure CN223193539U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mufflers, in particular to an impedance combined muffler structure. Background Art
[0002] With the acceleration of industrialization and urbanization, noise pollution has become an increasingly serious problem, posing a significant threat to people's quality of life and physical health. Mufflers, as important equipment for reducing noise emissions, have been widely used in mechanical equipment, transportation, ventilation and air-conditioning systems and other fields.
[0003] Most existing mufflers are traditional resistive mufflers, which utilize porous sound-absorbing materials to reduce noise. The principle is to attach the sound-absorbing material to the inner wall of the airflow channel or arrange it in a specific pattern within the pipe. Friction and viscosity convert the sound energy into heat, which is then dissipated, achieving the desired sound absorption. However, due to their principle, resistive mufflers are only effective at reducing mid- and high-frequency noise and are ineffective at treating mid- and low-frequency noise, resulting in a lack of sound absorption capability.
[0004] Therefore, the present application develops an impedance combined silencer structure to solve the problems existing in the prior art. Utility Model Content
[0005] The purpose of the utility model is to provide an impedance combined silencer structure to solve the problem that the prior art cannot simultaneously perform silence processing on mid-high frequency and mid-low frequency noises.
[0006] The technical solution of the present utility model is: an impedance combined silencer structure, comprising: an air inlet pipe and an air outlet pipe, an air inlet silencer chamber and an air outlet silencer chamber are formed inside the air inlet pipe and the air outlet pipe respectively, and sound-absorbing cotton is provided inside the air inlet silencer chamber and the air outlet silencer chamber, the air inlet silencer chamber is connected with the air outlet silencer chamber through a rotary cover plate, the end of the air inlet silencer chamber away from the rotary cover plate is connected with the air inlet cover plate, and the end of the air outlet silencer chamber away from the rotary cover plate is connected with the air outlet cover plate, the connection position between the air inlet cover plate and the rotary cover plate and the air inlet silencer chamber, and the connection position between the air outlet cover plate and the rotary cover plate and the air outlet silencer chamber form an expansion structure into the air inlet silencer chamber and the air outlet silencer chamber respectively.
[0007] Preferably, the revolving cover plate is bent multiple times to form a revolving channel, and the air inlet silencing chamber and the air outlet silencing chamber are connected through the revolving channel.
[0008] Preferably, the diameters of the vent pipe of the air inlet cover plate and the rotating channel of the rotating cover plate are smaller than the diameter of the air inlet muffler cavity, and the diameters of the vent pipe of the air outlet cover plate and the rotating channel are smaller than the diameter of the air outlet muffler cavity.
[0009] Preferably, when the air inlet cover plate, the air outlet cover plate and the rotary cover plate are inserted into the corresponding air inlet silencer chamber and the air outlet silencer chamber, the two ends of the two ventilation pipes and the rotary cover plate protrude relative to the bottom surface of the corresponding air inlet silencer chamber and the air outlet silencer chamber.
[0010] Preferably, the sound-absorbing cotton is provided with a through hole along its own axis, and two of the through holes respectively connect the vent pipe of the air inlet cover plate with the rotation channel, and the vent pipe of the air outlet cover plate with the rotation channel.
[0011] Preferably, the sound-absorbing cotton is evenly distributed in the air inlet silencer cavity and the air outlet silencer cavity, and the outer surface of the sound-absorbing cotton is tightly attached to the inner wall surface of the air inlet silencer cavity and the air outlet silencer cavity, the two ventilation pipes are inserted in the corresponding through holes, and the two ends of the revolving cover plate are inserted in the corresponding through holes.
[0012] Compared with the prior art, the advantages of the present invention are:
[0013] (1) The cross-sectional area of the inlet and outlet muffler chambers is larger than that of the vent pipe and the rotary channel. When the gas enters and exits the inlet and outlet muffler chambers, the diameter changes, which reduces the airflow velocity and achieves the muffler effect.
[0014] (2) The rotating channel formed by multiple bends makes the airflow more stable when passing through, which can slow down the change of airflow velocity, thereby reducing noise and vibration;
[0015] (3) The airflow passes through the air inlet muffler cavity, the rotation channel, and the air outlet muffler cavity. The diameter of the airflow changes many times after passing through, so that the airflow forms a more stable flow state in the muffler, reducing the airflow noise and vibration. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0017] Figure 1 This is an exploded view of the impedance combined muffler structure described in the present invention;
[0018] Figure 2 This is a front cross-sectional view of an impedance combined muffler structure according to the present invention;
[0019] Figure 3 This is a front cross-sectional view of an impedance-combined silencer structure without sound-absorbing cotton described in the present invention;
[0020] Figure 4 This is a side sectional view of the connection relationship between the air intake pipe, the air intake cover plate and the rotary cover plate of the utility model.
[0021] Among them: 1. Air intake pipe; 11. Air intake silencer chamber; 2. Air outlet pipe; 21. Air outlet silencer chamber; 3. Rotating cover plate; 31. Rotating channel; 4. Air intake cover plate; 5. Air outlet cover plate; 6. Sound-absorbing cotton; 7. Ventilation pipe; 8. Through hole. DETAILED DESCRIPTION
[0022] The following is a further detailed description of the present invention in conjunction with specific embodiments:
[0023] like Figure 1 As shown, an impedance combined silencer structure includes an air inlet pipe 1 and an air outlet pipe 2. One end of the air inlet pipe 1 is connected to an air inlet cover plate 4, and one end of the air outlet pipe 2 is connected to an air outlet cover plate 5. An air inlet muffler cavity 11 and an air outlet muffler cavity 21 are formed in the air inlet pipe 1 and the air outlet pipe 2 respectively. Sound-absorbing cotton 6 is provided inside the air inlet muffler cavity 11 and the air outlet muffler cavity 21. The air flow enters the air inlet muffler cavity 11 through the air inlet cover plate 4 and contacts with the sound-absorbing cotton 6, and enters the air outlet muffler cavity 21 through the rotary cover plate 3 and is discharged from the air outlet cover plate 5. The sound-absorbing cotton 6 is used to muffle the medium and high frequency noise, and the cross-sectional areas of the air inlet muffler cavity 11 and the air outlet muffler cavity 21 are both The cross-sectional area of the air duct 7 and the cross-sectional area of the rotary channel 31 are larger than those of the air intake cover 4 and the rotary cover 3 and the air intake silencer chamber 11, and the connection position of the air outlet cover 5 and the rotary cover 3 and the air outlet silencer chamber 21 form an expansion structure that expands into the air intake silencer chamber 11 and the air outlet silencer chamber 21 respectively. The larger the diameter of the air intake silencer chamber 11 and the air outlet silencer chamber 21, the larger the internal air volume, so that when the airflow enters the air intake silencer chamber 11 and the air outlet silencer chamber 21, the difference between the diameter of the airflow and the air duct 7 and the rotary channel 31 is greater, which can better consume sound energy, thereby achieving a better sound absorption effect and improving noise reduction performance.
[0024] In this embodiment, Figure 2 As shown, the revolving cover plate 3 is bent multiple times to form a revolving channel 31, and the air inlet silencer chamber 11 and the air outlet silencer chamber 21 are connected through the revolving channel 31, so that when the airflow passes through the revolving channel 31, the sound waves will be reflected and interfered multiple times in the revolving channel 31, which helps to convert the sound energy into heat energy or other forms of energy, thereby effectively reducing the noise level, and changing the length and shape of the revolving channel 31 can meet the needs of noise in different frequency ranges, so as to achieve more effective attenuation of noise of different frequencies. The revolving channel 31 that has been bent multiple times can make the airflow smoother when passing through, and can slow down the change in flow velocity of the airflow compared to a simple straight channel, reduce the formation of turbulence and eddies, and thus reduce airflow noise and vibration.
[0025] Further, if Figure 2-Figure 4As shown, the sound-absorbing cotton 6 is evenly distributed in the air inlet silencer cavity 11 and the air outlet silencer cavity 21, and is tightly attached to the inner walls of the air inlet silencer cavity 11 and the air outlet silencer cavity 21. The even distribution of the sound-absorbing cotton 6 can ensure that the noise reduction effect in the entire air inlet silencer cavity 11 and the air outlet silencer cavity 21 is consistent, avoiding the problem of local noise amplification; the sound-absorbing cotton 6 is provided with a through hole 8 along its own axial direction, and the two through holes 8 are connected to the vent pipe 7 of the air inlet cover plate 4 and the rotation channel 31, and the vent pipe 7 of the air outlet cover plate 5 and the rotation channel 31 respectively, and the two vent pipes 7 are inserted in the corresponding through holes 8, and the two ends of the rotation channel 31 are inserted in the corresponding through holes 8, so that the air flow can smoothly pass through the through hole 8. The air pipe 7 and the rotary channel 31 flow to the air inlet silencer chamber 11 and the air outlet silencer chamber 21, reducing the additional noise and energy loss caused by the obstruction of the air flow, and the through hole 8 can guide the air flow to pass through the sound-absorbing cotton 6 along a certain path, thereby achieving uniform distribution of the air flow and improving the sound-absorbing effect. The combination of the through hole 8 and the sound-absorbing cotton 6 forms a multiple sound-absorbing mechanism. When the air flow passes through the through hole 8, it will be affected by the sound-absorbing cotton 6. At the same time, the through hole 8 itself also reflects or interferes with the sound waves of a specific frequency, further enhancing the sound-absorbing effect. The through hole 8 also provides a flow path for the air flow, reduces the formation of eddies and turbulence, and thus reduces the generation of regenerated noise.
[0026] When both ends of the vent pipe 7 and the revolving cover plate 3 are inserted into the corresponding through holes 8, the two vent pipes 7 and the revolving cover plate 3 protrude relative to the bottom surfaces of the corresponding air inlet silencer chamber 11 and the air outlet silencer chamber 21. The vent pipe 7 and the revolving cover plate 3 protrude at both ends, and the protruding parts can serve as sound wave reflecting surfaces. Part of the sound waves will be reflected back to the original place and interfere with the incident sound waves, thereby reducing the sound energy and achieving the sound reduction effect.
[0027] The implementation principle of this embodiment is as follows:
[0028] The airflow enters the air intake silencer chamber 11 through the air intake cover plate 4, moves along the path of the through hole 8, and contacts the silencer surface. When entering the air intake silencer chamber 11, the airflow enters the space with a large cross-sectional area from the space with a small cross-sectional area. The reflection of the sound waves is achieved through the change of the cross-sectional area to achieve the effect of silence. At the same time, when the airflow moves in the sound-absorbing cotton 6, the sound energy is converted into heat energy through friction, which is then dissipated. Through two different forms of silencer methods, both medium and low frequency and medium and high frequency noises can be silenced. When the airflow enters the rotation channel 31, the sound energy is further reduced through multiple rotations and reflections. Then the airflow enters the air outlet silencer chamber 21 from the rotation channel 31, and once again enters the space with a large cross-sectional area from the space with a small cross-sectional area, and contacts the sound-absorbing cotton 6 again for another silence. Multiple reflections are achieved through multiple changes in cross-sectional areas, and the silencer effect is achieved through contact with the sound-absorbing cotton 6.
[0029] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they are not intended to limit the scope of protection of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.
Claims
1. An impedance combined muffler structure, characterized in that, include: An air inlet pipe (1) and an air outlet pipe (2) are provided, wherein an air inlet muffler chamber (11) and an air outlet muffler chamber (21) are formed inside the air inlet pipe (1) and the air outlet pipe (2), and sound-absorbing cotton (6) is provided inside the air inlet muffler chamber (11) and the air outlet muffler chamber (21), the air inlet muffler chamber (11) is connected to the air outlet muffler chamber (21) through a rotary cover plate (3), and the end of the air inlet muffler chamber (11) away from the rotary cover plate (3) is connected to the rotary cover plate (3). An air inlet cover plate (4) is connected to the end of the air outlet silencing chamber (21) away from the rotary cover plate (3). The air inlet cover plate (4), the rotary cover plate (3) and the air inlet silencing chamber (11) are connected to each other, and the air outlet cover plate (5), the rotary cover plate (3) and the air outlet silencing chamber (21) are connected to each other, forming an expansion structure into the air inlet silencing chamber (11) and the air outlet silencing chamber (21).
2. The impedance-combined muffler structure according to claim 1, characterized in that: The revolving cover plate (3) is bent multiple times to form a revolving channel (31), and the air inlet silencing chamber (11) and the air outlet silencing chamber (21) are connected through the revolving channel (31).
3. The impedance-combined muffler structure according to claim 2, characterized in that: The diameters of the vent pipe (7) of the air inlet cover plate (4) and the rotating channel (31) of the rotating cover plate (3) are smaller than the diameter of the air inlet silencing chamber (11), and the diameters of the vent pipe (7) of the air outlet cover plate (5) and the rotating channel (31) are smaller than the diameter of the air outlet silencing chamber (21).
4. The impedance-combined muffler structure according to claim 3, characterized in that: When the air inlet cover plate (4), the air outlet cover plate (5) and the revolving cover plate (3) are inserted into the corresponding air inlet silencer chamber (11) and the air outlet silencer chamber (21), the two ends of the two vent pipes (7) and the revolving cover plate (3) protrude relative to the bottom surfaces of the corresponding air inlet silencer chamber (11) and the air outlet silencer chamber (21).
5. The impedance-combined muffler structure according to claim 3, characterized in that: The sound-absorbing cotton (6) is provided with a through hole (8) along its own axial direction, and the two through holes (8) respectively connect the vent pipe (7) of the air inlet cover plate (4) and the rotation channel (31), and the vent pipe (7) of the air outlet cover plate (5) and the rotation channel (31).
6. The impedance-combined muffler structure according to claim 5, characterized in that: The sound-absorbing cotton (6) is evenly distributed in the air inlet silencer cavity (11) and the air outlet silencer cavity (21), and the outer surface of the sound-absorbing cotton (6) is in close contact with the inner wall surface of the air inlet silencer cavity (11) and the air outlet silencer cavity (21). The two ventilation pipes (7) are inserted into the corresponding through holes (8), and the two ends of the rotary cover plate (3) are inserted into the corresponding through holes (8).