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EBM type FFU
1、 FFU basic introduction FFU usually refers to the fan filter unit
Product details
1、 FFU Basic Introduction
FFU usually refers to a fan filter unit. Filters and modular terminal air supplies with filtering effects.
The FFU fan filter unit can be modularly connected. FFU fan filter units are widely used in clean rooms, dust-free operating tables, dust-free production lines, assembly cleanrooms, and hundreds of local applications. You can use the FFU fan filter unit. Create simple, clean workbenches, clean sheds, clean transfer cabinets, clean storage rooms, etc.
Main components:
1. Cabinet
Its materials are commonly galvanized aluminum alloy coated steel plates, aluminum alloys, and stainless steel. The first function is to support the fan and deflector, and the second function is to support the deflector.
2. Deflector
The airflow leveling device is built into the box around the bottom of the fan.
3. Fan
There are three types: single AC (AC/1-phase), DC (EC/1-phase), and 3 AC (AC/3-phase).
4. Control section
For AC FFU, a 5-speed or continuously variable speed regulator is usually used. The control chip of the DC system is built into the motor and provides remote control through special control software, computer, control gateway, and network lines.
The following advantages of FFU itself enable you to quickly apply FFU.
1. Flexible, easy to replace, install, and move
FFU has its own power and is independent and modular. Matching filters are easy to replace and are not limited to any area. In a clean workshop, you can use zoning for control as needed, and replace and move as needed.
2. Negative pressure ventilation
This is the unique feature of FFU. Due to the ability to generate static pressure, the clean room has positive pressure on the outside, preventing external particles from leaking into the clean area, and the sealing is both simple and safe.
3. Shorten the construction period
By using FFU, the production and installation of air ducts can be saved, and the construction period can be shortened.
4. Reduce operating costs
If FFU is chosen, the initial investment will be higher than using an air duct ventilation system, but future operations will emphasize energy-saving and maintenance free features.
5. Save space
Compared with other systems, the FFU system has a lower floor height inside the gas supply static pressure box and basically does not occupy clean room space.
2、 Advantages of FFU structure
Currently, most FFU fan filters are made of imported aluminum zinc plates with ring protection. It does not rust, is corrosion-resistant, lightweight and sturdy. The box design has a golden ratio point.
The FFU fan filter device is beautiful and elegant, with an ultra-thin body thickness of only 23 centimeters, and the total thickness of the high-efficiency filter does not exceed 30 centimeters. It weighs only 24 kilograms, saving space and facilitating construction, installation, and daily maintenance. The FFU fan filter unit has a significant energy-saving effect. Ultra low noise, uniform wind pressure, uniform and stable wind speed at the air outlet, low power consumption, low operating costs, and a service life of over 50000 hours.
The FFU fan filter unit is controlled by a non-contact induction 3-speed governor developed by the company, and all circuits are controlled by electrical switches to achieve safe and stable control. In addition to standard models, flexible and diverse configurations can also be used to manufacture various non-standard products according to customer needs.
Example: Air pipe connection flange, filter screen, box material, and other changes. The humanized design unit is equipped with a stainless steel handle, making transportation and installation more convenient and efficient.
3、 Application of FFU and issues requiring attention and maintenance measures
With the development of the economy and the improvement of people's living standards, people's requirements for product quality are becoming increasingly high. Production technology and production environment determine the quality of products, especially in fields with strict requirements for production environment, such as electronics, pharmaceuticals, food, biotechnology, medicine and laboratory, technology, construction, decoration, water supply and drainage, and air purification. Integration. HVAC， Air conditioning, automatic control, and many other technologies. The main technical indicators for measuring the quality of production environment in these industries are temperature, humidity, cleanliness, airflow, and indoor positive pressure. Therefore, the reasonable management of various technical indicators of the production environment to meet the requirements of special production processes has become one of the hotspots in clean engineering research.
The cleaning engineering workshop has different levels of requirements according to different usage requirements, such as 10, 100, 10000, etc. Therefore, the cleaning engineering has some difficult problems to overcome, including the fan filter unit (FFU). These issues have been relatively resolved. The following is a partial summary of the author's long-term work for reference.
Using FFU to solve cleaning engineering problems
(1) By using FFU, space can be saved and the problem of limited maintenance space above the cleanroom ceiling can be solved.
High level cleanrooms (such as rooms on the 100th floor) require laminar flow hoods on the 100th or 10th floor to meet process requirements, so a large static air supply box is installed above the ceiling of the cleanroom. Then install the ventilation system in the static pressure box. These static pressure boxes, together with the supply and return air ducts, occupy a large space, reducing maintenance space and in some cases affecting the use of fire exits.
However, when using FFU, the ceiling of the cleanroom is divided into multiple modules, each of which is an FFU, so each module (i.e. FFU) can be adjusted based on the pressure balance of the air supply static pressure box on the ceiling. Therefore, the height requirement for the static pressure box has been significantly reduced. At the same time, it saves installation space by saving a lot of air supply and return ducts. FFU effectively solves this problem, especially when renovation projects are limited by floor height.
(2) The independent structural characteristics of FFU can be adjusted at any time to compensate for the problem of insufficient fluidity in the clean room and solve manufacturing process defects that should not be adjusted.
The maintenance structure of a clean room is usually composed of metal wall panels, and the layout cannot be changed arbitrarily after completion. However, due to continuous updates in the production process, the cleanliness layout of the original factory is new. It cannot meet the process requirements and becomes a clean factory by replacing the product. However, this requires frequent changes and wastes a significant amount of financial and physical resources. Increasing or decreasing the number of FFUs allows you to partially adjust the cleanliness of the room as the process changes. FFU has its own power supply, ventilation holes, and lighting, saving a lot of investment. A purification system with centralized gas supply is almost impossible to achieve the same effect.
(3) The FFU system is energy-saving and solves the disadvantage of centralized gas supply caused by high operating costs of large air conditioning rooms and air conditioning units.
When the cleanliness of a single clean room in a large factory is high, air conditioning units with centralized air supply can overcome the resistance of air ducts as well as the resistance of initial, middle, and intermediate air ducts. It has a larger air volume and a higher fan pressure head. The resistance of high-efficiency filters can meet the cleaning requirements of these rooms, resulting in an overall increase in the operating cost of air conditioning, while the cleaning effect of rooms with higher cleanliness may not always meet the requirements. unlimited. In addition, if the air conditioner malfunctions in the centralized air supply system, all clean rooms related to the air conditioner will be shut down.
(4) Negative pressure seal
The static pressure box of the FFU air supply system is under negative pressure, so even if there is a leak in the air outlet installation, it will not leak from the clean room to the static pressure box and contaminate the clean room.
2 Precautions for using FFU
The abbreviation for fan filter unit is "FFU", which is equipped with a unique blower (shell less fan) and an efficient filter outlet to form an FFU system. The system has a special keel system, booster fan, cooling coil, external air system, and dedicated lights. In other words, combining the fan and filter (high-efficiency filter or ultra high efficiency filter) together forms a terminal purification device that can be independently powered. So far, air intakes (such as high-efficiency filters with fans, automatic cleaners, and laminar flow hoods commonly used in clean engineering) are all a type of FFU. Please pay attention to the following issues when selecting and installing FFU:
2. Noise control
FFU fans are typically used in parallel with several or dozens of units. When designing, considering the superposition of FFU noise, the "Code for Design of Cleanroom Equipment GB50073-2001" stipulates that the noise level of a clean room (empty state) shall not exceed 60 dB for non unidirectional flow clean rooms, and the flow and mixed flow in one direction of the clean room shall not exceed 65 dB. Therefore, when selecting a fan, it is best to choose a high-performance extruded direct drive rear radial blade fan to reduce overall noise.
(1) Selection of Fan Cover
When choosing the FFU fan housing structure, it is not only necessary to consider the leakage and damage of the fan during transportation and handling, but also to consider the use of disinfectants for disinfection and the environment in which the FFU is used. It is best to choose stainless steel or aluminum alloy. The material used for the shell.
(2) Selection of Dragon Bone Frame
Due to the direct installation of the FFU fan filter unit on the ceiling frame, it not only makes it easy and fast to replace the filter, but also balances the FFU fan and reduces the possibility of installation imbalance. Therefore, professional matching keel frames are usually considered. Mechanically cold roll this type of keel frame into a special geometric shape (U-shaped) cross-sectional steel, and perform anti-corrosion treatment on the metal surface according to the environment (electrostatic spraying, hot-dip galvanizing). Similar channel steel strength can meet the requirements of FFU operation.
(3) Selection of control mode
Currently, FFUs typically use single-phase multi-stage AC motors, three-phase multi-stage AC motors, and DC motors. The power supply voltage of the motor is approximately 110V, 220V, 270V, and 380V. The control methods are mainly divided into the following categories.
(1) Multi level switch control system: This system only includes the speed control switch and power switch that come with the FFU. The control components are built into the FFU and located at various positions on the ceiling of the clean room, requiring staff to use toggle switches to adjust the FFU in real time, which is very inconvenient to control. The FFU wind speed adjustment range is limited to a few gears. The advantages of using a multi-stage switch control method are easy control and low cost, but there are many disadvantages, such as high energy consumption, smooth speed adjustment, no feedback signal, and inability to perform flexible group control.
(2) Continuous speed control: Compared with the multi speed switch control mode, the continuous speed control of this system has an additional continuous speed controller, which can continuously adjust the FFU fan speed while improving motor efficiency. Make it possible, but at a cost. The consumption is even higher than in the multi speed switch control mode.
(3) Computer control: Compared with the previous two methods, this system has advanced computer control method functions. Not only can distributed control be adopted, but centralized monitoring of FFU can also be easily achieved, and FFU can be easily implemented. Single, multiple, and regional control. In addition, the control system can be configured to retain communication interfaces that can communicate with the host or network to achieve remote communication and management functions.
(4) Remote control: The remote control mode of this system is a supplement to the computer control mode. You can use the remote control to control each FFU in the supplementary computer control mode. Some of these control methods should be selected based on the actual situation.
3.5FFU maintenance and management
When using the FFU air supply method, it is usually not a single device, but it is difficult to maintain due to the placement of dozens to hundreds of FFUs on the ceiling. Usually, high-efficiency filters are replaced from clean rooms, but the static pressure box is high enough to block the fan from the inside. If not, the feasibility of fan maintenance should be considered from the clean room. In other words, when using FFU, it is necessary to consider the actual situation in order to maintain its characteristics and achieve the goal of reducing costs.
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