A clean room (simple clean room) is a simple clean room built for the fastest and most convenient use. The clean room has multiple cleanliness levels and space combinations that can be designed and manufactured according to usage needs. Therefore, its main characteristics are simple use, high flexibility, easy installation, short construction period, and portability. The clean room can also be locally added to areas that require high cleanliness in general grade clean rooms to reduce costs. A clean room is an air purification device that can provide a locally high cleanliness environment. The clean room is mainly composed of a box, a fan, a primary air filter, a damping layer, lighting fixtures, etc., and the outer shell is sprayed with plastic. This product can be hung or supported on the ground, with a compact structure and easy to use. It can be used individually or connected in multiple ways to form a belt shaped clean area. The clean room adopts industrial aluminum (or stainless steel square tube, iron square tube spray) as the frame, with fan filter unit (FFU) for air supply, and anti-static curtains (or tempered glass) hung around. Its internal purification level can reach 100-10000 levels. Suitable for areas with high local purification requirements within the operating zone.
Construction:
1. Framework: Industrial aluminum (or stainless steel square tube, iron square tube spray) is used as the frame to ensure stability, aesthetics, rust resistance, and dust-free properties;
2. Anti static curtains: Anti static curtains (or acrylic sheets) are used around the perimeter, which have good anti-static effect, high transparency, clear grid, good flexibility, no deformation, and are not easily aged;
3. Fan filter unit FFU: It adopts Singapore PCI centrifugal fan, which has the characteristics of long life, low noise, maintenance free, low vibration, and stepless speed change. The fan quality is reliable, the working life is long, and the unique air duct design greatly improves the efficiency of the fan and reduces noise! The internal purification level can reach 100-100K level; Especially suitable for areas with high local purification requirements in the workshop, such as assembly line operation areas.
4. The interior adopts a dedicated purification lamp for the purification room, which does not produce dust;
Principle:
The cleanliness of a cleanroom is often affected by airflow, in other words, the movement and diffusion of dust generated by people, machine compartments, building structures, etc. are dominated by airflow. The cleanroom system uses HEPA and ULPA to filter air, with a dust collection rate of up to 99.97-99.99995%. Therefore, the air filtered through this filter can be said to be very clean. However, in addition to people, there are also sources of dust such as machines in the clean room. Once these generated dust particles spread, it is impossible to maintain a clean space. Therefore, it is necessary to use airflow to quickly remove the generated dust from the outside.
◎ Class 10-100 cleanroom: If the internal purification level reaches Class 100 or above, the indoor clean airflow should form a single vertical flow. That is to say, the direction and velocity of the airflow in the clean room remain consistent at any point on the same section, so that the clean airflow can move the dust particles in the room at the fastest speed like a piston. To achieve vertical flow, it is necessary to cover the roof with high-efficiency filters in order to achieve single vertical flow and achieve a cleanliness level of 100 or above.
◎ 1K~100K cleanroom: Its airflow organization direction is different from that of Class 1-100 cleanrooms. The internal airflow flows at an uneven speed in a non parallel manner, accompanied by backflow and eddies. It mainly relies on the continuous dilution of internal air by clean airflow to gradually discharge internal pollution and achieve a clean effect. To achieve different levels of cleanrooms, it mainly relies on the different air volumes supplied per unit time.
1. Control of wind speed
The airflow inside the cleanroom is an important factor affecting the performance of the cleanroom. Generally, the airflow velocity in the cleanroom is selected between 0.25~0.5m/s. This airflow velocity belongs to the gentle wind area and is easily disturbed and tends to be chaotic by the actions of people, machines, etc. Although increasing the wind speed can suppress the impact of this disturbance and maintain cleanliness, the increase in wind speed will affect the increase of operating costs. Therefore, it is necessary to supply at the most appropriate wind speed while meeting the required cleanliness level, in order to achieve an appropriate wind speed supply and achieve economic effect. On the other hand, in order to achieve stable cleanliness in a clean room, maintaining a uniform airflow is also an important factor. If a uniform airflow cannot be maintained, it indicates that the wind speed is different, especially on the wall, where the airflow will cause vortex effects along the wall. In this case, achieving high cleanliness is actually very difficult. To maintain a uniform airflow in the vertical laminar flow direction, it is necessary to: (a) ensure that there is no difference in wind speed on the blowing surface; (b) The wind speed on the suction surface of the floor return air plate should not have any speed difference. Vortex phenomena occur when the speed is too low or too high (0.2m/s, 0.7m/s), while at a speed of 0.5m/s, the airflow is more uniform. Generally, in clean rooms, the wind speed is set between 0.25-0.5m/s.
2. Influencing factors
There are many factors that affect the airflow in clean rooms, such as process equipment, personnel, clean room assembly materials, lighting fixtures, etc. At the same time, the diversion points of airflow above production equipment should also be considered. The air flow diversion point on the surface of general operation platforms or production equipment should be located at 2/3 of the distance between the clean room space and the partition board, so that the air flow can flow from the inside of the process area to the work area while the operators are working, and carry away the fine dust; If the diversion point is configured in front of the process area, it will become an improper airflow diversion. At this time, most of the airflow will flow to the process area after the operation
The dust caused by human operation will be carried to the back of the equipment, causing contamination of the workbench and inevitably reducing the yield. Obstacles such as workbenches in clean rooms will experience eddy currents at their junctions, resulting in poor cleanliness in their vicinity. Drilling air return holes on workbenches will minimize the occurrence of eddy currents; The selection of appropriate assembly materials and the completeness of equipment layout are also important factors in determining whether airflow becomes a vortex phenomenon. The fan sucks in air from the top of the FFU, passes through the primary filter and high-efficiency filter, and the filtered clean air is uniformly sent out to the clean room at a speed of 0.45m/s ± 20% on the entire air outlet surface. Forming a uniform flow layer ensures a vertical unidirectional flow of clean air, thereby guaranteeing the required cleanliness within the workspace.
advantage:
1. It can be used alone or in combination.
Compared with civil or prefabricated cleanrooms, Class 100 cleanrooms have lower investment, faster results, easier installation, and lower operating costs.
3. Modular structure, easy to improve cleanliness level, strong scalability, and high reuse value
4. Easy to move (universal wheels can be installed)