An automatic air volume measurement and control system for a clean air-conditioning system in a pharmaceutical workshop

Abstract

The invention provides an automatic measurement and control system for air volume of a clean air-conditioning system in a pharmaceutical workshop, comprising: an air flow equalization device, a wind pressure measurement device, and a signal processing device, wherein the air flow equalization device and the wind pressure measurement device are arranged in the air duct, and the signal processing device and The wind pressure measuring device is electrically connected, and the wind speed value is calculated according to the total pressure value and the static pressure value measured by the wind pressure measuring device, and then the frequency of the frequency converter of the air conditioner fan and the opening of the electric valve on the air pipe are controlled according to the wind speed value to adjust The air supply volume is forced to equalize the air in the air duct through the air equalization device installed in the air duct, so that when the wind pressure measuring device measures the wind pressure value in the air duct, the measurement result is accurate and is not affected by the outside world; when measuring Real-time measurement can be carried out, and the air-conditioning system can be controlled and tracked in real time through the signal processing device; no manual participation is required, automatic detection can be realized, the measurement and control efficiency is high, and the timeliness is good.

Description

technical field [0001] The invention relates to the control field of an air-conditioning system in a pharmaceutical factory building, in particular to an automatic air volume measurement and control system for a clean air-conditioning system in a pharmaceutical factory building. Background technique [0002] The clean air-conditioning system of the pharmaceutical plant, especially the clean area for the production of sterile drugs, is very strict on the temperature, humidity and cleanliness of the clean production environment under the requirements of current national regulations and industry standards. [0003] According to "Chapter 3 - Cleanliness Level" in "Appendix 1: Sterile Drugs" of China's 2010 version of "Good Manufacturing Practice (GMP)", the clean areas of A, B, C, and D levels are clean Accuracy, especially static and static, and ≥0.5μm and ≥5μm conditions, the maximum allowable number of suspended particles is very strict. [0004] [0005] At present, the ...

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Problems solved by technology

[0011] 1. The accuracy of the measurement method is poor, and it is greatly affected by the outside world. The accuracy of wind speed measurement is affected by various factors;

[0012] The anemometer has great difficulty in selecting the measurement point, which will be affected by the angle between the measurement point and the direction of gas flow, the rationality of the distribution of the measurement point in the air duct section, the distance of the straight pipe section before and after the measurement point, etc. There will be large differences in the data, and often cannot reflect the real air duct flow velocity, and the overall measurement accuracy is poor

[0013] 2. The measurement result is only an instantaneous value, which cannot reflect the change of air volume over a period of time, and cannot cope with various application scenarios and states of the air conditioning system;

Off-line wind speed measurement can only reflect the instantaneous air volume at the time of measurement. When the fan frequency, fresh air valve opening, and exhaust conditions in various states change, the overall resistance distribution of the entire air conditioning system will change. The air volume and pressure difference of each room will also change, which will cause the orderly environment of the entire air conditioning system to become uncontrollable, which will destroy the cleanliness of the pharmaceutical clean environment, lead to a sharp increase in the quality risk of pharmaceutical production, and ultimately endanger the safety of users

[0015] 3. The technical level of the commissioning personnel is high, the labor cost is large, the measurement and control efficiency is low, and the timeliness is poor;

[0016] The traditional air volume measurement and control method requires the participation of commissioning personnel with certain HVAC expertise and a deeper understanding of the current air conditioning system in terms of measurement and control. Overall, it is highly professional and difficult for daily operation and maintenance.

Moreover, the traditional method requires multiple people to debug on-site, the overall measurement and control efficiency is low, and the timeliness is poor. Generally, it takes 2-5 days to complete the debugging of a small and medium-sized pharmaceutical clean air conditioning system. The entire debugging time and cost are relatively large.

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