A fully automatic backwash precision filter

Abstract

The invention relates to the technical field of seawater desalination, and discloses a fully automatic backwashing precision filter, which includes a tank body, and the inside of the tank body includes a water inlet cavity at the top and a water outlet cavity at the bottom, and one side of the tank body The top is provided with a water inlet, the bottom of one side of the tank is provided with a water outlet, the bottom of the tank is provided with a sewage outlet, the other side of the tank is fixedly installed with a controller, and the inside of the tank An upper sealing plate is fixedly installed at the top, and a lower sealing plate is fixedly installed at the bottom of the inside of the tank body, and a overflow pipe is provided on one side of the inside of the tank body, and the top of the upper sealing plate and the bottom of the lower sealing plate A solenoid valve is fixedly installed at the bottom, and a filter element is movably connected between the upper sealing plate and the lower sealing plate. Through the top-down filtration method, the filtered water is directly discharged, which improves the filtration efficiency and prevents too much filter residue in the filter element. The rotating filter element drives the water to rotate and improves the effect of backwashing.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a fully automatic backwash precision filter. Background technique [0002] Seawater desalination is to use seawater desalination to produce fresh water. The reverse osmosis membrane desalination method that is often used now requires precise filtration of pretreated seawater. The working principle of the existing fully automatic backwash precision filter: refer to the attached manual Figure 7 , enter the pretreated seawater from the water inlet at the lower end of one side of the precision filter tank, filter through the filter element inside the tank, and then discharge it from the water outlet at the upper end of the other side of the tank (filtered by the pressure difference between the inside and outside of the filter element) , the internal pressure of the filter element is greater than the external pressure); when filtering, the filtered residue accumulates on...

AI Technical Summary

Problems solved by technology

[0006] 3. The structure of the existing automatic backwashing precision filter divides the whole tank into upper and lower parts, and the inside of the filter element is connected to the water inlet cavity, so that some of the filter residue accumulated inside the filter element falls into the water inlet cavity, and the water enters after a long time The more filter residue accumulates in the cavity, the more it is mixed with the seawater at the water inlet and filtered through the filter element again, which will increase the filtration time and accelerate the clogging of the filter element

[0008] 4. Automatic backwash When the precision filter is backwashed, backwash while filtering, so that the water flow near the water outlet is fast (the greater the flow rate, the lower the pressure), and the filter element is under less pressure at this part, so that The backwash effect near the water outlet will be greatly reduced, and the filter residue near the water outlet will accumulate more, which will also cause the filter residue cleaning effect at this part to decline, and the backwash effect will continue to affect the backwash while the effect is reduced. Filtration efficiency

[0009] 5. When backwashing, use the pressure of filling the tank with water to remove the filter residue, because the filter element is fixedly installed inside the filter, and the filtered water basically remains in the water outlet cavity, so only Rely on the negative pressure inside the filter element for backwashing, so that it will take a long time to clean the inside of the filter element, and the backwashing effect is poor

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