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  • 实验室净化工程的装修原理介绍
    来源:http://www.sdyhrs.com 浏览: 发布日期:2017-07-26
    乱流洁净室的主要特点是从来流到出流(从送风口到回风口)之间气流的流通截面是变化的,洁净室截面比送风口截面大得多,因而不能在全室截面或者在全室工作区截面形成匀速气流。所以,送风口以后的流线彼此有很大或者越来越大的夹角,曲率半径很小,气流在室内不可能以单一方向流动,将会彼此撞击,将有回流、旋涡产生。这就决定乱流洁净室的流态实质是:突变流;非均匀流。
    The main characteristics of turbulent clean room is always flow to flow (from the outlet to the inlet section between the air circulation) is changing, the clean room section outlet section is much larger than that in the whole room and cannot cross section or work section in the chamber to form a uniform flow. Therefore, the flow line after the air inlet has a large or increasing angle between each other, and the radius of curvature is very small, and the airflow in the room can not flow in a single direction, and will collide with each other, and there will be backflow and vortex generation. This decision is the essence of fluid turbulence cleanroom: mutation flow; non uniform flow.
    单向流洁净室一般有两种类型,即水平流和垂直流。在水平流系统中,气流是从一面墙流向另一面墙。在垂直流系统中,气流是从吊顶流向地面。对要求洁净室的悬浮粒子浓度或微生物浓度更低的场合,就使用单向气流。以前称这类洁净室为“层流”洁净室。单向流和层流的名称均说明了其气流的状况:气流以一个方向流动(或是垂直的或是水平的),并以一般是0.3米/秒至0.5米/秒(60英尺/分钟至100英尺/分钟)的均速流过整个空间。由满布洁净室吊顶的过滤器向室内送风。
    Unidirectional flow clean room are generally of two types, namely horizontal flow and vertical flow. In a horizontal flow system, the airflow flows from one wall to the other. In a vertical flow system, the air flows from the ceiling to the ground. For situations requiring lower concentrations of suspended particles or microbial concentrations in clean rooms, unidirectional airflow is used. Previously called this kind of clean room is “ laminar flow ” clean room. The name of unidirectional flow and laminar flow are explained the situation: the air flow in one direction (either vertical or horizontal), and in general is 0.3 M / s to 0.5 m / S (60 ft / min to 100 ft / min) of the average speed through the entire space. The HEPA filter with clean room ceiling to indoor air.
    气流有如一个空气活塞,向下流经室内,带走污染物,然后从地面排出。又在与外部的一些新鲜空气混合后,再循环至过滤器。人员和工艺所产生的悬浮污染可立即被这种空气清除掉,而紊流通风系统采用的是混合与稀释原理。在一间没有任何障碍物的空房间,单向流用比前面提到的低得多的风速,就可以很快将污染物清除。
    The airflow is like an air piston that flows down through the chamber, removing contaminants and then discharging from the ground. Also, after mixing with some fresh air from the outside, recycle to the HEPA filter. Suspended contamination generated by personnel and processes can be immediately removed by this air, while the turbulent ventilation system uses the principle of mixing and dilution. In an empty room without any obstructions, unidirectional flow can quickly remove pollutants, much less than the wind velocity previously mentioned.
    但在一个操作间,机器以及机器周围走动的人员,会对气流形成障碍。障碍物可以使单向流变成紊流,从而在障碍物周围形成气流团。人员的活动也可以使单向流变成紊流。在这些紊流中,由于风速较低,空气稀释程度较小,从而使得污染浓度较高。
    手术室装修
    But in an operating room, the machines and the people moving around the machine form obstacles to the airflow. Obstacles can cause turbulence to flow in one direction and form a mass of air around the obstruction. The activities of the people can also make one-way turbulence into turbulence. In these turbulence, because of the low wind speed, the air dilution degree is smaller, thus causes the pollution concentration to be higher.
    因此,必须将风速保持在0.3米/秒至0.5米/秒(60英尺/分钟至100英尺/分钟)的范围里,以便使中断的单向流能快速恢复,充分稀释障碍物周围紊流区的污染。用风速可以正确地表示出单向流,因为风速越高室内就越洁净。而每小时换气次数与房间的体积有关,如吊顶的高低,因此不适合用来表示单向流。单向流室内的送风量是紊流室的很多倍(10到100倍)。
    Therefore, the wind speed must be maintained at 0.3 M / s to 0.5 m / S (60 ft / min to 100 ft / min) range, so that the one-way flow interruption can be quickly recovered, fully diluted turbulent zone around the obstacles of pollution. The wind speed can correctly represent a unidirectional flow, because the higher the wind speed, the cleaner the room. The hourly ventilation rate is related to the volume of the room, such as the height of the ceiling, so it is not suitable for one-way flow. The airflow rate in a one-way flow chamber is many times (10 to 100 times) of the turbulence chamber.

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