Views: 0 Author: Site Editor Publish Time: 2020-08-21 Origin: Site
With the development of economy and the improvement of people's living standards, people have higher and higher requirements for product quality. The production technology and production environment determine product quality, which forces manufacturers to pursue better production technology and a higher production environment. Especially in the fields of electronics, pharmaceuticals, food, bioengineering, medical treatment, laboratories, etc., which have strict requirements on the production environment, it integrates technology, construction, decoration, water supply and drainage, air purification, heating, ventilation, air conditioning, automatic control, etc. Technology. The main technical indicators to measure the quality of the production environment in these industries are temperature, humidity, cleanliness, air volume, and indoor positive pressure. Therefore, reasonable control of the various technical indicators of the production environment to meet the requirements of special production processes has become one of the research hotspots of clean engineering.FFUAs a kind of purification equipment, it is widely used in various cleaning projects. The full name of FFU is called Fan Filter Unit\"fan filter unit group\", which is the clean equipment that can provide power by connecting the fan and filter together. As early as the 1960s, the world's first laminar flow The establishment of the clean room has already begun to appear the application of FFU.
2. Current status of FFU control method
At present, FFU generally uses single-phase multi-speed AC motors, three-phase multi-speed AC motors and DC motors. The power supply voltage of the motor is roughly 110V, 220V, 270V, 380V. The control methods are mainly divided into the following types:
◆ Multi-level switch control ◆ Continuous speed adjustment control ◆ Computer control ◆ Remote control
3. FFU intelligent control system
Now I am atFFUIn the field of application, the application rate of its control system is still relatively low, and in the popular FFU intelligent control system in the international market, it is generally only for the FFU equipped with a brushless DC motor. Especially in today's global energy shortage, the energy-saving benefits of the control system are more and more valued. Each clean room determines the corresponding wind speed according to the production process of the product, and at the same time has to consider the issue of energy consumption. However, the general control system can adjust the wind speed range is limited, and cannot provide accurate wind speed according to specific requirements, especially when the rest time is 8 hours away, it still maintains a high wind speed, which undoubtedly brings huge energy waste. In response to this situation, the HH-F series FFU intelligent control system that can digitally adjust the wind speed has recently been introduced. The system is simple to operate and has a friendly interface, especially it can be set digitally according to the specific wind speed requirements of the clean room (for example, 0.37m/s, 0.28m/s).
HH-F series FFU control system is a set of distributed control system, which can easily realize the functions of on-site distributed control and centralized management. It can flexibly control the start-stop and wind speed of each fan in the clean room. The control system uses repeater technology to solve the problem of limited 485 drive capacity and can control unlimited fans. This control system includes the following four parts:
◆ On-site intelligent controller ◆ Wired centralized control method ◆ Remote control method ◆ System comprehensive function
In summary, it is not difficult to see that with the rapid development of high-tech industries, there will be more and more clean rooms using FFU on a large scale. Clean roomFFUCentralized control will also be a concern for designers and owners.