1. The double-layer laundry tub structure of the fully automatic washing machine determines the problem of interlayer fouling.
2. The reason for the formation of dirt in the washing machine: after the washing is completed, the rinse water discharged from the final dehydration is attached to each component in the washing barrel (a small amount of detergent and dirt are still dissolved in the rinse water); the water level line There is still residual washing foam in the above part. After this part of water and foam naturally evaporates, the dissolved substances contained in it precipitate and adhere to the surface of each washing component, forming an extremely thin layer of dirt. The dirt layer in the laundry tub cannot be removed by friction with the clothes in the next wash. As the number of washes increases, the dirt layer continues to accumulate, from thin to thick, from invisible to visible, and finally becomes what we see. "Dirt Layer".
3. Defects of existing cleaning technology
(1) Cleaning balls:
1. When dehydrating, the cleaning ball hits the wall of the barrel and makes a loud sound.
2. Only the very thin dirt formed after the last laundry can be broken into invisible fragments and dissolved into this washing.
3. The cleaning ball will form obstacles during drainage and reduce the drainage flow rate.
4. Do not clean the bottom of the inner barrel and the structural grooves produced by the reinforcing ribs.
5. The bottom surface of the impeller cannot be cleaned.
6. Do not clean the part above the water level.
(2) Brush type (including flexible chain)
1. The outer wall of the inner barrel is not a smooth circle, and has raised drainage holes and fixings for filters and water guide plates. They create cuts in the brush. Produces noise and rapid wear.
2. Only the extremely thin dirt formed after the last washing can be broken into invisible fragments and dissolved into this washing.
3. Do not clean the bottom surface of the inner barrel and the structural grooves produced by the reinforcing ribs.
4. The bottom surface of the impeller cannot be cleaned.
(3) Spraying and rinsing
1. Most of them use washing water to rinse, which has no effect.
2. The flushing force is too small to remove the attached dirt.
3. If you use clean water to rinse, you need to set up a special program.
4. The timing of water spray intervention is not clear.
(4) Inner and outer bucket isolation type
1. Upper drainage. Each time the water is drained, the entire bucket of water needs to be rotated at high speed, which consumes a lot of power.
2. The lower drainage and sealing structure are complex and costly.
(5) High-temperature sterilization:
It can only be sterilized, but dirt will still remain.
Fourth direction of improvement: Aim at the causes of dirt formation, improve the structure or cleaning methods, block the generation of dirt, and truly achieve clean water laundry.
5. Focus on technology: Pending international patent "A washing machine with an anti-fouling device between the inner and outer barrels" (Application No.: PCT/CN2017/087706)