Water purifiers can be divided into gradual tightening water purifiers and self-cleaning water purifiers according to the design grade of pipelines. The traditional water purifier is a gradually tightening water purifier. Its internal pipeline is designed as a loose filter element at the front and a tight filter element at the back. It consists of PP melt-blown filter element, granular carbon, compressed carbon, RO reverse osmosis membrane or ultrafiltration membrane, and post-activated carbon. Usually, these five stages are connected end to end.
Trapped and deposited in the filter element, it needs to be disassembled and cleaned manually regularly to ensure the normal operation of the machine. The other is a more advanced self-cleaning water purifier. Two channels are designed in the machine, and a washing water channel is added. When the washing water as ordinary domestic water passes through the channel, it washes the filter element in the machine, especially the raw water side of the membrane filter element, thus realizing self-cleaning.
And at the moment of opening and closing the flushing faucet, the water flowing from the head section and the tail section can be used to discharge the trapped dirt in time and quickly. This structure is reasonable in design, which saves the trouble of manual disassembly and cleaning, avoids the re-pollution of the mechanism itself and reduces energy consumption.
Extended data:
Working principle:
The first stage: PP cotton: remove all kinds of visible objects/dust and impurities from tap water.
Second and third stages: Pre-activated carbon: The third stage of some low-grade water purifiers is also PP cotton, and activated carbon removes chlorine and organic impurities. It can also absorb the peculiar smell, color and smell produced by organic matter in water.
The fourth stage: ultrafiltration or reverse osmosis membrane: the membrane can remove bacteria, viruses and spores from water.
Stage 5: Post-activated carbon device: further improve the taste and remove the odor.
Most water purifiers adopt a progressive structure based on the screen-blocking filtering principle, which is composed of multi-stage filter elements connected in series from end to end. The precision of filter elements is arranged in sequence from low to high, so that multi-stage filter elements can share the trapped dirt, reduce the number of filter element blockage, manual sewage discharge and disassembly and washing, and prolong the cycle of replacing filter elements.
There is also a new design idea, that is, the self-cleaning structure based on the principle of mass circulation. Its design idea is no longer to provide as much space as possible, but to separate a small part of clean water by the principle of mass separation, and at the same time, to make the raw water circulate as usual as much as possible, so that pollutants can be taken away with the water in time, so as to achieve the purpose of running water without rot.