Self-cleaning and differential pressure control of clean room
Self-cleaning and differential pressure control of clean room
The self-cleaning time of the clean clean room modular is the time required for the indoor air to reach the cleanliness required by the clean room from the polluted state of the shutdown after the purification air-conditioning system is turned on; the self-cleaning time of the clean room has been determined during the design, and the management of the clean air-conditioning equipment Personnel should be turned on by this time...
Text label: clean room differential pressure control, clean room self-cleaning time
Self-cleaning and differential pressure control of clean room
The self-cleaning time of the clean room is the time required for the indoor air to reach the cleanliness required by the clean room from the polluted state of the shutdown after the purification air-conditioning system is turned on; the self-cleaning time of the clean room has been determined during the design, and the management of the clean air-conditioning equipment Personnel should turn on the unit before this time. For systems with fans on duty, this time can be shorter, and for systems without fans on duty, this time needs to be longer; before each clean room is put into operation, it should be designed according to the design. The required self-cleaning time determines the time when the purification air-conditioning unit is turned on in advance. There should also be a self-cleaning process between two operations in the same operating room to eliminate the contamination of bacteria and dust particles flowing in the room during the previous operation and avoid crossover. Infection; during the self-cleaning time of the clean room, the operating room should maintain a static operation state, and no one should stay indoors. At the same time, parameters such as indoor temperature and humidity should be set according to the needs to provide suitable environmental conditions for the operation.
The pressure difference of the clean room can maintain the pressure gradient of the air in the entire clean area, and ensure that the air flows from the high cleanliness area to the low cleanliness area, or flows in the specified direction, which is an effective means to control pollution; in pharmaceutical companies and negative The pressure difference is also an effective measure to control cross-contamination; this orderly air flow in the clean operating department can ensure that the cleanliness and bacterial count of each clean room meet the requirements, and the pressure difference is controlled by an automatic control system. It is done by adjusting the indoor air supply, return air and exhaust air volume; when the air supply volume of the clean room is greater than the sum of the exhaust air volume and the return air volume, the room is under positive pressure, and the clean room air will flow through the door seam and other places. The infiltration of adjacent rooms or corridors can resist the infiltration of particles in the air in the low-pressure area, which is a normal operating condition. If the pressure difference decreases for some reason, the automatic control system will adjust it in time to ensure the specified pressure difference; The clean clean room modular is not equipped with an automatic control system. The operation and management personnel should observe the differential pressure gauge of the relevant clean clean room modular at any time, and adjust it as soon as possible to restore the normal differential pressure if any problem is found. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean rooms.
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In clean area management and quality control, laminar flow interference testing has received much attention, and whether it is only applicable to Class A laminar flow remains to be considered.