Air duct muffler
Selection of specifications
Selection according to the specifications of the tuyere and the diffuser
Selection of pipeline specifications according to system
Our company can manufacture various types and specifications of noise elimination static pressure box according to the needs of users.
Main features and technical performance
The inner material of the static pressure box can select rock wool, glass wool and other sound absorbing materials according to the requirements. The surface is metal plate, and the anticorrosive property is superior.
It can be perforated, metal finished, glass cloth and other materials.
Micro perforated plate muffler and anechoic elbow
The inner circle structure of the outer corner is used to improve the noise reduction effect, reduce the loss of the resistance and reduce the regenerative noise. The shell adopts the steel plate (or galvanized plate), the sound absorbing material is glass cloth superfine glass cotton, and the wood frame (or steel frame) is used as the keel to ensure the stability of the sound absorbing material under the high speed air flow.
The micro perforated plate noise elimination elbow (R=100 to 500mm) has the advantages of small volume, small resistance and good silencing effect.
Working principle of silencer and muffler
The silent pressure tank is an indispensable part of air conditioning in the ventilation and air conditioning system. It can be used with the tuyere or the diffuser to eliminate the air noise at the air outlet. The static pressure box can be configured in the system, which can increase the static pressure of the system and stabilize the air flow. It is more reasonable for the air flow organization to achieve the ideal air conditioning effect.
Selection of specifications
Selection according to the specifications of the tuyere and the diffuser
Selection of pipeline specifications according to system
Our company can manufacture various types and specifications of noise elimination static pressure box according to the needs of users.
Main features and technical performance
The inner material of the static pressure box can select rock wool, glass wool and other sound absorbing materials according to the requirements. The surface is metal plate, and the anticorrosive property is superior.
It can be perforated, metal finished, glass cloth and other materials.
Anechoic static pressure box
The silent pressure tank is an indispensable part of air conditioning in the ventilation and air conditioning system. It can be used with the tuyere or the diffuser to eliminate the air noise at the air outlet. The static pressure box can be configured in the system, which can increase the static pressure of the system and stabilize the air flow. It is more reasonable for the air flow organization to achieve the ideal air conditioning effect.
Selection of specifications
Selection according to the specifications of the tuyere and the diffuser
Selection of pipeline specifications according to system
Our company can manufacture various types and specifications of noise elimination static pressure box according to the needs of users.
Main features and technical performance
The inner material of the static pressure box can select rock wool, glass wool and other sound absorbing materials according to the requirements. The surface is metal plate, and the anticorrosive property is superior.
It can be perforated, metal finished, glass cloth and other materials.
Working principle of a folded plate muffler
It is a wide spectrum muffler which is widely used in air conditioning ventilation system to reduce the noise of middle and low pressure fans in the air conditioning ventilation system, by using the mutation of the pipe section in the muffler, the function of the expansion chamber of the inner and outer chambers and the sound attenuation effect on the low frequency and part of the intermediate frequency. In order to enhance the effect of noise elimination, it can also be used in series with muffling in series. The wind speed is generally 6~ 8 m / sec.
Impedance muffler
Impedance muffler is a muffler which combines sound absorption and acoustic reflection properly. At the same time, it has both the elimination of medium and high frequency noise and resistive muffler to eliminate the characteristics of low and intermediate frequency noise.
1. Technical requirements
The 1. impedance compound muffler is a combination of Resistance Muffler with significant noise reduction effect to high and middle frequency noise and a combination of resistant mufflers with significant noise reduction effect at middle and low frequency. Since the wavelengths of sound waves are longer, the resistance and the resistant muffler are combined with the sound coupling effect, which can not be seen as a simple superposition.
2. because of muffler combination type, there are many kinds of impedance composite muffler, but the stereotypes products are manufactured according to the original national standard drawing.
3. because of its good noise elimination effect and wide spectrum characteristics, it is widely used in ventilation and air conditioning engineering. However, like a resistive muffler, it is not suitable for steam erosion or high temperature applications.
Two. The main points of the selection of products
1. impedance composite muffler selects main control parameters such as noise attenuation, spectrum characteristics, wind speed, air volume and air resistance coefficient.
2. the sound absorbing material and structure selected should not only satisfy the requirements of noise elimination performance, but also pay attention to moisture-proof, temperature resistance, anti-corrosion and air flow scour.
3. impedance composite muffler can not be used in clean air conditioning system because it has two shortcomings.
4. muffler noise reduction effect is related to wind speed. It should be selected according to the dynamic noise reduction of factory samples.
5. the muffler effect is related to the sound level of the muffler inlet, and the muffler entrance is usually located at the higher position of the system sound source (such as the outlet of the fan or air conditioner).
6. muffler should be located in the smooth tube section of the duct system and should be as close as possible to noise control requirements.
7. in order to prevent the influence of the regenerative noise, the flow velocity in the air channel of the muffler should be determined according to the standard of controlling the noise level. The resistance muffler should generally be below 8m/s, and the maximum should not be > 12m/s. The micro perforated plate muffler has large wind resistance (15~20m/s) and large wind resistance.
8. mufflers should not be installed in the air conditioning room, nor should they be installed outside the door to prevent noise from penetrating through the pipeline after the muffler.
9. when a wind pipe is transported to a number of rooms, it is appropriate to expand the distance of the air outlet in the adjacent rooms, or to prevent noise interference from the room by increasing the distance of the air vent of the adjacent rooms, or using the sound absorption elbow and the inner wall of the wind pipe.
10. general impedance reduction muffler for air conditioning system and resistive muffler for exhaust system.
micropunch plate muffler
It is a silencer lining the structure of a micro perforated plate. It can eliminate air noise in a wide range of frequency, and has the properties of high temperature resistance, oil resistance and corrosion resistance. Even if there is a lot of water in the air flow, it does not affect the work. Because the diameter of perforation is small and the surface of the plate is smooth, the resistance loss of muffler is smaller than that of general resistive muffler. If the flow rate is 20m/s, the resistance loss of 2m straight through micro perforated plate muffler is not more than 19.612Pa. The acoustic impedance (nonlinear resistance) of perforation is related to sound pressure and airflow velocity. These effects should be taken into account when designing microporous plate mufflers. Microplate mufflers are often used in blower
Exhaust, air conditioning system, gas turbine exhaust, aircraft engine test room exhaust, intake port of jet engine, intake and exhaust of internal combustion engine, etc. The perforation diameters of these mufflers are usually equal to or larger than 1mm, but they are also known as microplate mufflers according to their habits.
The micro perforated plate muffler is usually made of pure metal sheet with a thickness of less than 1mm. The bit is perforated with a diameter less than 1mm on the sheet, and the perforation rate is 1% 1 3%. The spectrum performance of the muffler can be controlled by selecting the different perforation rate and the depth of the cavity with different thickness of the plate, so that the sound attenuation effect can be obtained in the required frequency range.
