Device and method for controlling air supply volume of purification system of a clean area

Abstract

The invention discloses a device for controlling the air supply volume of a purification system of a clean area. The device comprises an air conditioning cabinet, a static pressure sensor, a high-efficiency filter and a PLC or DDC system, wherein the air conditioning cabinet comprises a variable-frequency fan and is used for regulating and controlling the air supply volume, the static pressure sensor is used for detecting static pressure of each clean room, the high-efficiency filter is used for filtering air entering each clean room; and the PLC or DDC system is in signal connection with the air conditioning cabinet and the static pressure sensor and is used for adjusting the frequency of the variable-frequency fan according to the static pressure, detected by the static pressure sensor, of each clean room so as to regulate and control the air supply volume. The invention further relates to a method for controlling the air supply volume of the purification system of the clean area. The method is characterized in that the method adopts the device; and return air of the clean room is constant, and the air supply volume of the purification system of the clean area is controlled by associating the static pressure of the clean room with the frequency of the variable-frequency fan of the air conditioning cabinet. The device and the method have the advantages that the air supply volume of the system can be simply and effectively constant; and the ventilation rate of each clean room and the relative pressure difference between the clean rooms can be stabilized.

Description

technical field [0001] The invention relates to HVAC control in the field of pharmaceutical production, in particular to a device for controlling the air supply volume of a purification system in a clean area. The control of the correlation between the frequency conversion fan of the air-conditioning box and the static pressure of the clean room after the terminal high-efficiency filter can be simple and efficient. It is also effective to keep the air supply volume of the system constant. The invention also relates to the method for controlling the air supply volume of the clean area purification system. Background technique [0002] According to the requirements of China's 2010 version of GMP regulations, in addition to maintaining a constant temperature and humidity range in the clean area, each clean room needs to maintain the number of air changes corresponding to the clean level, and rooms with different clean levels need to maintain a temperature of more than 10Pa dif...

AI Technical Summary

Problems solved by technology

If the door of the negative pressure section of the air conditioning box is accidentally opened, the wind speed will suddenly increase at this time, the pressure at the outlet of the air conditioning box will suddenly drop, and the system will output an instruction to increase the frequency instead. Such a vicious circle will cause the high efficiency filter at the end blown out

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