What are the differential pressure control methods in the clean room workshop? -common problem
What are the differential pressure control methods in the clean room workshop?
The static pressure of the positive pressure clean room is greater than the static pressure of the adjacent room or the environment. Using this pressure difference, the air in the clean room can only flow outward, which prevents the adjacent room or outdoor environment from affecting the The pollution of the dust room; the negative pressure clean room is just the opposite; through this pressure difference...
Text label: clean room pharmaceutical cleanroom, differential pressure control method
What are the differential pressure control methods in the clean room workshop?
The static pressure of the positive pressure clean room is greater than the static pressure of the adjacent room or the environment. Using this pressure difference, the air in the clean room can only flow outward, which prevents the adjacent room or outdoor environment from affecting the The pollution of the dust room; the negative pressure clean room is just the opposite; through the joint action of this pressure difference and the sealed enclosure structure, a barrier protection system is formed to achieve the purpose of pollution control. Return air outlet control: Adjust the return air volume by adjusting the airflow channel of the return air louver or the resistance of the damping layer to achieve the purpose of controlling the indoor static pressure. This method is simple and easy, but the adjustment amount is limited; It can increase more than 1Pa, and even 2Pa can not be reached. By adjusting the resistance of the damping layer, the adjustment range can be larger.
Residual pressure valve control: By changing the position of the balance slider on it, the opening of the residual pressure valve is changed to realize indoor pressure control. Return air valve control: In the air conditioning design of the clean room, a regulating valve should be installed on each return air branch pipe, otherwise the pressure difference is not easy to adjust, and the air supply volume is required to be constant. When the exhaust air volume is determined, the indoor pressure difference It is realized by adjusting the air return valve on the branch pipe. This adjustment method is very effective in increasing the pressure difference. Automatic control: According to the nature of the clean room, there are different control schemes, some control the exhaust air, some control the return air, and some control the fresh air; the change of indoor pressure is detected by the sensitive element and transmitted to the controller, the controller Sending out the adjustment command, the actuator adjusts the size of the valve or changes the wind speed to achieve the purpose of controlling the pressure difference. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for dust-free workshops and clean workshops.
For a clean room without an automatic control system, regular manual adjustment of the differential pressure can also meet general requirements. For a system, with the increase of operating time, the resistance of the filter continues to increase, and the air supply volume will continue to increase. During the service period of the terminal high-efficiency filter, the system resistance is reduced by cleaning the primary and medium-efficiency filters to achieve the required air volume; in the process of regularly adjusting the air supply volume, the fresh air valve and return air The main valve also needs to be fine-tuned synchronously, so that the whole system is in the required pressure differential environment, and then adjust each clean room; if the fine-tuning is about 1Pa, it can be achieved by adjusting the angle of the louver, otherwise, adjust the return air branch pipe. The valve is generally adjusted once every 3-6 months.
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