Characteristic index of unidirectional flow clean room

Characteristics of one-way flow clean room are as follows:

Principle of one-way flow clean room:

In the one-way flow clean room, from the air supply port to the return port, the airflow through the way of the cross-section of the almost no change, coupled with the inlet static pressure box and high-efficiency filters of the equalization effect of equalization of pressure and current flow, the flow rate of the whole room cross-section of the flow rate of the uniform, and at least in the work area, the flow line is unidirectional and parallel, no eddy current. And at least in the working area of the flow line unidirectional parallel, no vortex.

This is the unidirectional flow of the three major features of the clean room. Here, the flow of unidirectional parallel, means that when the flow lines are parallel to each other, a single direction, and clean air is not a stream or a few streams, but full of room section, so this clean room is not relying on the clean air to the room dirty air mixing and dilution of the role of the clean air launching the role of the room dirty air discharged along the entire section to the outdoors, to achieve the purpose of purifying the indoor air.

So, the former Federal Republic of Germany, some people called the unidirectional flow of clean room airflow for the "piston flow", "flat push flow" of the former Soviet Union, called the "squeezed by the weak air jet". Clean air is like an air piston, along the room this "cylinder", forward, so that the dust particles can only move forward, no return, the original dust concentration of air out of the room extrusion.

Non-unidirectional flow clean room:

Non-unidirectional flow clean room is the source of pollution emanating particles and other indoor diffusion as a prerequisite for high efficiency filters to deal with clean air will be diluted dilution of pollutants, so as to maintain indoor air cleanliness level.

This kind of clean room is suitable for iso6-9 level, its advantage is simple structure, construction and operation cost is low, has certain flexibility; But can't make the indoor to achieve a more strict air cleanliness level requirements, if the production process allows in the clean room set up a clean bench, laminar flow hood, etc. can be localized to achieve a more stringent level, to meet the requirements of product production. Non-unidirectional flow clean room is generally only applicable to room width ≤ 6.0m 6-9 level clean room; if the clean room width must be greater than 6.0m, it is appropriate to use a double-sided arrangement of the return air outlet.

1-air supply duct; 2-exhaust duct; 3-return duct; 4-piping; 5-bridge; 6-flexible connector; 7-air valve; 8-high-efficiency air outlet; 9-return air outlet.

This kind of clean room is widely used in electronic industry, biomedicine and various industrial clean room, its purification and air conditioning system of air supply and return method usually adopts top send side return, top send top return, etc., in the clean production area of the technical mezzanine or technical sandwich arrangement of air supply and return ducts, exhaust ducts and a variety of utility power piping, etc..

(a) top send down back (b) top send down side back (c) side send side down back (d) top send top back.

The above is the "clean room is a unidirectional flow or non-unidirectional flow" of the relevant introduction, there are questions can be asked Hunan pure Zhen purification.