Air exhaust and noise reduction silencer

Abstract

The utility model discloses an exhaust noise reduction silencer which comprises a silencing shell, a spiral silencing channel, a plurality of baffles, a damping layer and a silencing layer, and relates to the technical field of silencers. The spiral silencing channel is arranged in the silencer, the propagation path of sound waves in the spiral silencing channel can be increased, the propagation time of the sound waves in the spiral silencing channel can be prolonged, more energy is consumed in the multiple reflection and refraction processes of the sound waves, and therefore the noise reduction effect is improved, a plurality of baffles are further arranged on the inner wall of the spiral silencing channel, and the noise reduction effect is improved. Due to the fact that the positions of the through holes of the baffles are different, sound waves can be reflected and refracted through the baffles, the sound waves can undergo different path and angle changes when passing through the baffles, the propagation path length of the sound waves in the silencing channel can be further increased, and the propagation time of the sound waves in the silencing channel can be further prolonged. And more energy is consumed in multiple reflection and refraction processes of sound waves, so that the noise of airflow is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mufflers, in particular to an exhaust noise reduction muffler. Background Art

[0002] With the development of industrialization and urbanization, exhaust equipment is widely used in various industrial, commercial and civil facilities. However, exhaust equipment will generate a lot of noise during operation, which will have adverse effects on the surrounding environment and personnel. Therefore, the development of an effective exhaust noise reduction muffler is of great significance to improve environmental quality and protect personnel health. Utility Model Content

[0003] The purpose of the utility model is to provide an exhaust noise reduction muffler to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an exhaust noise reduction silencer, comprising a silencer shell, a spiral silencer channel, a plurality of baffles, a damping layer and a silencer layer, wherein the spiral silencer channel is located in the silencer shell, and the two ends of the spiral silencer channel are respectively connected to the left and right sides of the silencer shell, the left side of the spiral silencer channel is an air inlet end, and the right side of the spiral silencer channel is an air outlet end, the inner wall of the spiral silencer channel is provided with a plurality of baffles, and each of the baffles is provided with a through hole of the same diameter, the inner wall of the spiral silencer channel is provided with a damping layer, and the outer wall of the spiral silencer channel is provided with a silencer layer.

[0005] Preferably, the damping layer is damping rubber, and the thickness of the damping rubber is 5 mm.

[0006] Preferably, the through holes on adjacent baffles are staggered.

[0007] Preferably, the sound-absorbing layer comprises nano-scale porous silicon, polymer polyurethane foam and glass fiber felt, wherein the nano-scale porous silicon covers the outer wall of the spiral sound-absorbing channel, the polymer polyurethane foam covers the nano-scale porous silicon, and the glass fiber felt covers the polymer polyurethane foam.

[0008] Preferably, the pore size of the nano-porous silicon is between 1 and 100 nanometers, and the porosity is between 70% and 90%.

[0009] Preferably, the density of the polymer polyurethane foam is 0.05-0.2 g / cm 3 and its thickness is 10-20mm.

[0010] Preferably, the glass fiber mat has a diameter of 1-10 microns and a thickness of 10-20 mm.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model can increase the propagation path and time of sound waves in the spiral silencer channel by arranging a spiral silencer channel in the silencer, so that the sound waves consume more energy in the process of multiple reflections and refractions, thereby increasing the noise reduction effect, and the utility model also arranges multiple baffles on the inner wall of the spiral silencer channel. Since the through-hole position of each baffle is different, each baffle will cause the sound waves to reflect and refract, and the sound waves will experience different paths and angle changes when passing through each baffle, which can further increase the propagation path length and time of the sound waves in the silencer channel, so that the sound waves consume more energy in the process of multiple reflections and refractions, and further reduce the noise of the airflow. At the same time, the utility model arranges a silencer layer on the outer wall of the spiral silencer channel, and the silencer layer is composed of nano-scale porous silicon, polymer polyurethane foam and glass fiber felt line. The combination of these three can achieve a broadband silencer effect, covering a wide frequency range from low frequency to high frequency, more effectively reducing the propagation of sound waves and reducing noise levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0013] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of position A;

[0014] Figure 3 This is a schematic diagram of the main structure of the baffle of the utility model;

[0015] Figure 4 It is a schematic structural diagram of the sound-absorbing layer of the utility model.

[0016] In the figure: 1. Silencing shell; 2. Spiral silencing channel; 3. Baffle; 4. Damping layer; 5. Silencing layer; 51. Nano-porous silicon; 52. Polyurethane foam; 53. Glass fiber felt; 6. Through hole. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-4The utility model provides an exhaust noise reduction muffler, comprising a muffler shell 1, a spiral muffler channel 2, a plurality of baffles 3, a damping layer 4 and a muffler layer 5. The spiral muffler channel 2 is located in the muffler shell 1, and the two ends of the spiral muffler channel 2 are respectively connected to the left and right sides of the muffler shell 1. The channel extends in a spiral shape. The spiral muffler channel 2 can increase the propagation path and time of the sound wave in the spiral muffler channel 2, so that the sound wave consumes more energy in the process of multiple reflections and refractions. The left side of the spiral muffler channel 2 is the air inlet end, and the spiral muffler channel 2 is the air inlet end. The right side of the silencer channel 2 is the air outlet end. The air inlet end and the air outlet end of the spiral silencer channel 2 are respectively connected to the air outlet and the exhaust duct of the external exhaust equipment. The inner wall of the spiral silencer channel 2 is provided with multiple baffles 3. The obstacles arranged on the inner wall of the channel are used to change the propagation direction or speed of the sound waves, and each baffle 3 is provided with a through hole 6 with the same diameter. The small holes on the baffle 3 allow the sound waves to pass through, but will have a certain hindering effect on the sound waves. The inner wall of the spiral silencer channel 2 is provided with a damping layer 4, and the outer wall of the spiral silencer channel 2 is provided with a sound absorbing layer 5.

[0019] Specifically, the damping layer 4 is a damping rubber with a thickness of 5 mm. The damping rubber generally has a high internal damping performance and can effectively absorb and reduce the propagation of sound waves in the channel. When the sound wave encounters the damping rubber, due to the viscoelasticity and internal friction of the rubber, the energy of the sound wave will be converted into heat energy or other forms of energy and dissipated, thereby reducing the propagation of the sound wave.

[0020] Specifically, the through holes 6 on adjacent baffles 3 are staggered. This staggered design causes the sound waves to change direction when passing through each baffle 3, thereby increasing the propagation path and time of the sound waves in the channel and further improving the sound reduction effect.

[0021] Specifically, the sound-absorbing layer 5 includes nano-porous silicon 51, polymer polyurethane foam 52 and glass fiber felt 53. The nano-porous silicon 51 covers the outer wall of the spiral sound-absorbing channel 2, the polymer polyurethane foam 52 covers the nano-porous silicon 51, and the glass fiber felt 53 covers the polymer polyurethane foam 52. The nano-porous silicon 51, the polymer polyurethane foam 52 and the glass fiber felt 53 all have excellent sound-absorbing properties. The combination of these three covers a wide frequency range from low frequency to high frequency, which can more effectively reduce the propagation of sound waves and reduce the noise level.

[0022] Specifically, the pore size of the nano-porous silicon 51 is between 1 and 100 nanometers, and the porosity is between 70% and 90%.

[0023] Specifically, the density of the polymer polyurethane foam 52 is 0.05-0.2 g / cm 3 and its thickness is 10-20mm.

[0024] Specifically, the glass fiber mat 53 has a diameter of 1-10 micrometers and a thickness of 10-20 mm.

[0025] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust noise reduction muffler, characterized in that: The invention comprises a sound-absorbing shell (1), a spiral sound-absorbing channel (2), a plurality of baffles (3), a damping layer (4) and a sound-absorbing layer (5), wherein the spiral sound-absorbing channel (2) is located in the sound-absorbing shell (1), and the two ends of the spiral sound-absorbing channel (2) are respectively connected to the left and right sides of the sound-absorbing shell (1), the left side of the spiral sound-absorbing channel (2) is an air inlet end, and the right side of the spiral sound-absorbing channel (2) is an air outlet end, the inner wall of the spiral sound-absorbing channel (2) is provided with a plurality of baffles (3), and each of the baffles (3) is provided with a through hole (6) of the same diameter, the inner wall of the spiral sound-absorbing channel (2) is provided with a damping layer (4), and the outer wall of the spiral sound-absorbing channel (2) is provided with a sound-absorbing layer (5).

2. The exhaust noise reduction muffler according to claim 1, characterized in that: The damping layer (4) is damping rubber, and the thickness of the damping rubber is 5 mm.

3. The exhaust noise reduction muffler according to claim 1, characterized in that: The through holes (6) on adjacent baffles (3) are arranged in a staggered manner.

4. The exhaust noise reduction muffler according to claim 1, characterized in that: The sound-absorbing layer (5) comprises nano-scale porous silicon (51), polymer polyurethane foam (52) and glass fiber felt (53); the nano-scale porous silicon (51) covers the outer wall of the spiral sound-absorbing channel (2); the polymer polyurethane foam (52) covers the nano-scale porous silicon (51); and the glass fiber felt (53) covers the polymer polyurethane foam (52).

5. The exhaust noise reduction muffler according to claim 4, characterized in that: The pore size of the nano-scale porous silicon (51) is between 1 and 100 nanometers, and the porosity is between 70% and 90%.

6. The exhaust noise reduction muffler according to claim 4, characterized in that: The density of the high molecular polyurethane foam (52) is 0.05-0.2 g / cm 3 and its thickness is 10-20mm.

7. The exhaust noise reduction muffler according to claim 4, characterized in that: The glass fiber mat (53) has a diameter of 1-10 micrometers and a thickness of 10-20 mm.

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