Air returning type fan filter unit (FFU) below ceiling

Abstract

The invention discloses an air returning type fan filter unit (FFU) below a ceiling. The air returning type FFU below the ceiling comprises a box body and a controller; an air returning opening is formed in the middle of the bottom surface of the box body; air outlets are respectively formed in the box body bottom surfaces at two sides of the air returning opening; material filtering units are mounted at the air returning openings through connecting structures; a centrifugal fan is mounted in the box body above each material filtering unit and is connected with a motor, wherein the motor is connected with the controller; a pair of volutes which is oppositely mounted on any group of diagonal angles of a rectangular area surrounding the centrifugal fan; the projection of the sidewalls of the volutes, opposite to the centrifugal fan on the level is in a form of a spiral of Archimedes. With the adoption of the air returning type FFU below the ceiling, the air returning structure is adopted, so that the applicable scope of FFU is expanded to some extent, and the limitation from the ceiling is avoided; the air flowing structure in the FFU is reasonable; the flowing resistance of liquid in the device is reduced, and thus the energy consumption is decreased.

Description

technical field [0001] The invention relates to an air filter structure, in particular to an air return type fan filter unit under a suspended ceiling. Background technique [0002] Fan filter unit is also known as FFU (Fan Filter Units). The air supply port, self-cleaner, and laminar flow hood of the high-efficiency filter with fan commonly used in clean engineering are the prototypes of FFU. In the past two decades or so, FFU has gradually appeared in clean rooms and other places as an independent terminal equipment. The emergence of FFU makes the system structure simple, flexible, energy-saving operation, automatic control, reliable sealing, can reduce the height of the building, shorten the construction period, especially suitable for high-clean systems and local clean environments. However, at present, the technology of domestic FFU production plants is uneven, and the lack of uniform standards has affected the industrialization process, especially the following proble...

AI Technical Summary

Problems solved by technology

However, at present, the technology of domestic FFU production plants is uneven, and the lack of unified standards has affected the industrialization process, especially the following problems: the noise has not been reduced for a long time, generally reaching 52dB; the design of filter material replacement and fan maintenance Unreasonable, which increases the difficulty of maintenance; the flow channel is not optimized, and the rated air supply volume cannot be well satisfied

Disadvantages of this design: 1) The upper return air needs to ensure that the room is a non-sealed ceiling, otherwise the return air pipeline needs to be installed, which makes the construction complicated and increases the investment; 2) The noise reduction design only considers the flow channel for aerodynamic noise The optimized design failed to fundamentally eliminate the noise generated by the vibration of the fan, and this part of the noise accounted for a greater proportion; 3) The filter material is installed on both sides of the fan, inside the filter unit, such filter material is installed The method is very unfavorable for the replacement of the filter material; 4) the design lacks the remote control function, which brings inconvenience to the actual use of the equipment installed in the ceiling

Disadvantages of this design: 1) The design of the upper return air makes the scope of application limited by the ceiling and other factors; 2) The integral box design is not suitable for the replacement of filter materials and the maintenance of the fan; 3) Noise reduction and maintenance are not considered Noise reduction design; 4) The lack of design of the flow channel will lead to excessive resistance of the flow channel, which will not only affect the performance of the fan, but also increase the aerodynamic noise

5) There is only one layer of high-efficiency filter, so the design will make the dust holding capacity low, and the filter material needs to be replaced frequently

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