1. Overview of z-j silencing static pressure box

1.1. Z j-01 silencing static pressure box

Zj-01 static pressure box plays the role of increasing static pressure and stabilizing air flow in the ventilation system. The static pressure box uses the sudden change of section and the sound absorption effect of micro perforated plate on the surface of the box to effectively attenuate the fan noise. It has good silencing performance, wide frequency band, small air resistance and low regeneration noise. The anechoic static pressure box is made of galvanized plate as the shell, the inner wall is made of orifice plate into resistive sound-absorbing sheet, and glass cloth sheet and ultra-fine glass wool are attached as sound-absorbing materials. It can integrate the function of increasing static pressure and reducing aerodynamic noise. It is an indispensable accessory of ventilation system.

1.2. Zj-02 built-in silencing static pressure box

Zj-02 static pressure box is an essential accessory matched with the slit air outlet. The air supply of the main air duct is connected to the neck of the static pressure box (i.e. dimension D) through a hose. A butterfly valve is set here to control the air volume entering the static pressure box. The inner surface of the static pressure box is pasted with sound-absorbing materials to eliminate part of the noise. The configuration of static pressure box in the air supply duct can reduce the dynamic pressure and increase the static pressure, which can stabilize the air flow and obtain a more ideal air supply effect. b × A can be determined according to the size of the slit air outlet, D can be determined according to the selected hose diameter, a can be arbitrarily selected within 2m, and can also undertake the design and manufacture of the static pressure box according to the special requirements of users.