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Density distribution plate through hole board to regulate the outlet flow FFU. Grill grid density by adjusting the outlet stream of FFU. Power curve shape of the curve to induce flow stream, but also through the hole density distribution curve to adjust the airflow.
A, FFU appearance
Currently, all the world's manufacturers of FFU, from the appearance may be so divided:
1, from the shape of two types, one is rectangular, an upper part of the slope shape.
2, from the structure in two ways, one is whole, one for the split.
Split shape FFU has the following advantages:
① replacement of the filter becomes party
② reduces installation labor intensity.
The overall shape of the FFU has the following advantages:
① increase the tightness of FFU, effectively preventing the leakage.
② helps reduce noise
③ help reduce vibration
Second, the component parts of FFU
At present, all kinds of FFU at most consists of the following components (top to bottom, in order from the inside to the outside), depending on the part of manufacturers may be reduced.
1, the pre-filter 6, the air flow equalizing means
2, the housing body 7, the filter
3, the duct connecting member 8, the metal fence
4, the motor 9, a knife edge
5, the impeller 10, the control element
Below, we analyze the introduction of the various components:
First, the pre-filter
Usually washable polyurethane foam, mainly to prevent damage to the filter due to construction, maintenance or other unforeseen circumstances produce debris which may cause.
Second, the outer housing
Constituent materials generally have aluminum, aluminum alloy, hard plastic, stainless steel, such as several different manufacturers and different environments have different options, a thickness of about 1.2 to 2.0, depending on the thickness of the case and some can be manned.
Third, the duct connecting member
Clean the lower level (≤1000 level Federal Standard 209E) occasions, when the upper ceiling no plenum, FFU with duct connecting member such that duct connection is very convenient and FFU.
Fourth, the motor
Currently, AC and DC motors have use in FFU, the large volume DC motor, high cost, easy control, high energy consumption. AC motors of small volume, low cost, control of appropriate technology, low energy consumption. Now FFU used motor life is approximately 4 to 100,000 hours vary. Some excellent motor will have the appropriate technology, such as non-lubricated, sealed bearings, with overheat protection, commutator life has been significantly improved and so on.
Fifth, the impeller
There are two forms of the impeller, forward and backward, forward help increase airflow to the flow vector, enhancing the ability to remove dust. Reclined help reduce energy consumption, reduce noise.
Sixth, the flow equalizer means
With the growing popularity of FFU, most manufacturers have begun assembling the flow equalizer means for adjusting the outlet flow FFU, thereby improving the clean room air distribution. At present, this balance means approximately divided into three: one for the plate, mainly to adjust the air flow through the outlet FFU hole density board. One for the grid, mainly through the grille to adjust the density of the outlet stream of FFU. Another power curve is mainly induced by the shape of the curve of the flowing gas stream, and also through the hole density distribution curve to adjust the air flow.
Seven filter
FFU used filters and other filters clean room used as no further explanation.
Eight protective metal
Protective metal protective effect mainly on the filter, most of them anti-static.
Nine, knife edge
When the FFU used in some special occasions, the knife edge of FFU can be used tank seal, which can meet the requirements of high sealability.
Ten, the control unit
FFU control can be roughly divided into multi-gear switching, continuous adjustment, and other types of computer control, while achieving the functions single control, sub-control, alarm and operating status display.