What is the principle of anechoic static pressure box, what is the principle of action of static pre

The function of the static pressure box is to change the dynamic pressure into static pressure and evenly distribute the air volume, which is mostly used in front of the strip seam tuyere.

The following is the main function of the static pressure box.

1. The static pressure box is an accessory for the air supply system to reduce the dynamic pressure, increase the static pressure, stabilize the air flow and reduce the air vibration, which can make the air supply effect more ideal. The diffuser and the static pressure box are integrated with the following characteristics: it is conducive to the attenuation of the NC value, and the effect is good if the sound insulation board is pasted in the static pressure box.

Organize the airflow to make it evenly distributed, and install it in the ventilation duct in the natural phase, which is convenient for piping production, ensures that the diffuser is correct, and the coordination between the natural phase is smooth, and the airflow is stable; The anechoic static pressure box can also be installed in the ventilation duct without ceiling structure, which can reduce the installation space and form a harmonious layout and beautiful three-dimensional shape.

2. The static pressure box is mainly a necessary part of the air supply system to reduce the dynamic pressure, increase the static pressure, stabilize the air flow and reduce the air vibration, which can make the air supply effect good.

It is mainly in the air conditioning, ventilation system and fresh air unit, fan coil unit supporting products, mainly to eliminate the air flow noise at the air outlet, in the system configuration of static pressure box, can increase the static pressure of the system, stabilize the airflow, is the airflow organization tends to be more reasonable, to achieve the ideal air conditioning effect.

3. The static pressure box can evenly distribute the air volume, and can change part of the dynamic pressure into static pressure to make the wind blow farther; And it can reduce noise, and can obtain uniform static pressure air outlet, reducing dynamic pressure loss. And there is also the role of joints.

The Texas Aoda static pressure box is well applied to the ventilation system, which can improve the comprehensive performance of the ventilation system; The anechoic static pressure box is used to connect the air outlet of the air conditioner in the air-conditioning machine room with the air duct or muffler, which has the functions of capacity expansion, diameter change and sound reduction.

The air connection pipe of the static pressure box is (2000*500), which is the size of the silencing static pressure box.

The static pressure box changes from dynamic pressure to static pressure, and the anechoic static pressure box has more silencing links than the static pressure box.

The cabinet of the silotic static pressure box sent back to the tuyere is rectangular and has sound-absorbing materials pasted inside, as shown in Figure 4-55. It is installed in front of the air supply (diffuser) and has a good sound attenuation effect due to the fact that the air entering and outgoing is at 90°, coupled with the action of the internal sound-absorbing material.

Figure 4-55 Anechoic static pressure box.

a) Structure (b) Appearance.

The horizontal air duct is connected with the downward air outlet through the static pressure box, which has both a silocating effect and is conducive to the airflow distribution of the air supply outlet.

It's not that the connection method is the same, but the role is different.

Anechoic classification. 1. Resistive muffler: It is used to absorb sound energy and reduce noise by attaching sound-absorbing materials in the box, which is generally used to eliminate high and medium frequency noise. However, due to structural reasons, it is not suitable for high temperature, high humidity and high speed.

2. Anti-muffler: It is silenced by changing the cross-section. Our commonly used anechoic static pressure box floor shed is based on this principle. Generally, early dust is low in medium and low frequency noise, and there are no specific requirements for the wind system.

3. Impedance compound: of course, it is a structural principle that combines the two. Low, mid, and high frequency noises can be eliminated.

However, for the requirements of the wind system, the same resistance muffler is the same as that for the general civil air conditioning and ventilation system, I personally think that it is better to choose an impedance composite muffler. Resistive mufflers have good mid- and high-frequency muffling properties. According to the different geometry of the airflow channel, it can be divided into straight tube type, sheet type, folded plate type, labyrinth type, honeycomb type, acoustic flow type, baffle type, elbow type, etc.

Resistant mufflers are suitable for eliminating low- and mid-frequency noise or narrowband noise. According to its different working principles, it can be divided into various types such as dilation, resonance cavity and interference. Impedance composite muffler, with resonance cavity, expansion chamber, perforated screen and other acoustic filter devices, integrates the good medium and high frequency muffling characteristics of the resistive muffler and the good low frequency muffler characteristics of the impedance muffler, so its muffler frequency bandwidth, it is one of the most commonly used standard muffler series.

The suitable wind speed is 6 8 m sec, up to 8 12 m and can be used alone or in tandem. Silencing effect: low frequency 10 15dBm, mid frequency 15 25dBm, high frequency 25 30dBm, average drag coefficient is.

According to "Air Conditioning", the anechoic elbow and the anechoic static pressure box are all a kind of muffler.

Function. A muffler is a device that allows airflow to pass through and effectively blocks or attenuates the outward transmission of sound energy.