An expandable filter with a soft elastic outer wall

Abstract

The invention relates to an expandable filter tank adopting a flexible soft elastic outer wall. A water inlet weir notch is communicated with a filtering chamber by a water inlet weir plate arranged on one side of the water inlet weir notch; the bottom of the filtering chamber is provided with a backwashing water outlet pipe; a packing chamber is formed inside the filtering chamber; the upper part of the packing chamber is provided with an overlying perforation plate; the flexible soft elastic filter tank outer wall is arranged outside the packing chamber; an auxiliary support of the filter tank outer wall is connected with one end of a lower perforation plate and the other end of the lower perforation plate is connected with the flexible soft elastic filter tank outer wall; an aerator pipe is arranged below the lower perforation plate; a backwashing water channel and an outlet channel which are communicated with the filtering chamber are arranged outside the filtering chamber; the top end of the backwashing water channel is provided with a backwashing water inlet pipe; and one side of the bottom of the outlet channel is provided with a water outlet pipe. According to the invention, thickness of a filter medium is changed as required, so that when the expandable filter tank carries out normal filtering, the requirement for thickness of a designed filter layer can be met; in the backwashing process, height of the filter medium layer is reduced, so that backwashing energy consumption is reduced and backwashing efficiency is improved; and the expandable filter tank has the characteristics of saving energy, reducing consumption and promoting a backwashing effect of the filter medium.

Description

technical field [0001] The invention relates to a water treatment structure in the field of water pollution control, in particular to an expandable filter tank with a soft elastic outer wall. Background technique [0002] Filter is an important water treatment structure, which is widely used to remove suspended solids in water and reduce water turbidity. Traditional filters have the following characteristics: [0003] 1. Traditional filters usually have a fixed rigid outer wall as a filter material filling space. In order to meet the requirements of effluent water quality, the thickness of the filter material layer needs to meet certain requirements. [0004] 2. After a certain working cycle of the filter, when the water flow flows from bottom to top for backwashing, the filter bed expands and the thickness increases greatly. It is necessary to provide enough backwashing water head to meet the energy required for backwashing. [0005] 3. The greater the thickness of the f...

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Problems solved by technology

[0005] 3. The greater the thickness of the filter material layer, the more uneven the vertical backwashing intensity, and the more unfavorable it is for thorough and sufficient filter material backwashing

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