Selection and arrangement of general lighting fixtures in clean room

Update:14 Mar 2022

In order to do a good job in the lighting design of the […]

In order to do a good job in the lighting design of the cleanroom with high cleanliness level, firstly introduce the cleanliness level and clean airflow pattern of the cleanroom. In the new "Clean Room Design Specification" GB50073-2001, many revisions have been made to the regulations on air cleanliness levels. GBJ73-84 stipulates that air cleanliness is divided into 4 levels, namely 100, 1000, and 10000. With the rapid development of microelectronics and integrated circuit industries, the requirements for air cleanliness in cleanrooms are getting higher and higher, and the particle size of dust particles is required to be controlled to below 0.1µm. Equivalent to adopting the relevant provisions in the international standard ISO14644-1, the air cleanliness level has been increased from 4 levels to 9 levels, namely Level 1 and Level 2. . . . . . Level 9.
The selection of the flow pattern of clean air is also clearly stipulated in the specification: "When the air cleanliness level is required to be 1 to 4, the vertical unidirectional flow should be used; when the air cleanliness level is required to be level 5, the vertical one-way flow should be used. One-way flow or horizontal one-way flow; for grades 6 to 9, the non-unidirectional flow should be used.” The so-called airflow pattern is a reasonable design of the flow pattern and distribution of the air in the cleanroom. Its characteristics: It should be considered to avoid or reduce the eddy current, which is conducive to the rapid and effective removal of pollutants, and should try to limit and reduce the diffusion of dust and bacteria emitted by indoor pollution sources, and maintain the air cleanliness level required by the indoor production environment.
Due to the particularity of the cleanroom, the selection of general lighting fixtures should choose lamps with a smooth appearance, less concave and convex surfaces, less dust accumulation, easy cleaning, and make of materials that are not suitable for static electricity. In addition to meeting the illuminance requirements, the selection and arrangement of lamps should also be considered according to the indoor airflow pattern. When the ceiling is a vertical one-way flow air outlet, such as a lithography workshop of a very large-scale integrated circuit factory. . . . . . , the area of ​​the high-efficiency filter air outlet can sometimes reach about 80% of the ceiling area, which brings difficulties to the arrangement of lamps. At this time, teardrop fluorescent lamps should be used. This type of lamp has less influence on airflow and can be installed on The lower side of the high-efficiency filter special aluminum profile frame (see Figure 1 and Figure 2) does not hinder the air supply and effectively utilizes the only ceiling space. According to the different ceiling modules, different lengths of lamps can be selected.
Recently, Panasonic Electric Works (China) Co., Ltd. has launched a new type of clean lamp FPC41808, which is similar to teardrop fluorescent lamps. It adopts a streamlined design to avoid turbulent eddy currents, which can not only prevent dust accumulation but also obtain smooth and stable airflow. can also be used in.
For non-unidirectional flow clean rooms, triangular ceiling fluorescent lamps or box ceiling fluorescent lamps should be used. The arrangement of lamps is preferably continuous light strip type or discontinuous light strip type, which should be arranged in a unified manner with fire alarm detectors and air-conditioning vents. . For example the electron gun assembly workshop of a picture tube factory, with an area of ​​2160┫ (60×36), adopts double-tube triangular ceiling fluorescent lamps, with 12 rows of intermittent strips, and 20 lights in each row. When installing the ceiling fluorescent lamp, pay attention to the method of using sealant and gasket to achieve a sealed installation, maintain the pressure difference in the cleanroom, and avoid pollution. Specific reference to the lighting control of the cleanroom
Horizontal one-way flow clean room, the floor height of the building is not too high, the air supply and return air outlets are installed on the sidewalls, the ceiling is convenient for the arrangement of lamps, and embedded fluorescent lamps can be used to minimize the impact on airflow.