Water storage tank for water purifying system

Abstract

A water storage tank for water purifying system is disclosed. It mainly includes a solid housing and at least one air bag. The solid housing has a liquid storing space for storing liquid. The air bag being positioned in the liquid storing space and the air bag is movable inside. This air bag will expand or shrink depending upon the pressure in the liquid storing space. So, this invention can be modified from an existing storage tank. There is no water leakage problem causing by the membrane of the storage tank. In addition, it is easy to replace the air bag. In addition, the overall cost is extremely low.

1 . A water storage tank for water purifying system comprising:
 a solid housing having a liquid storing space for storing liquid, said solid housing being disposed with at least one connecting portion;   at least one air bag, said air bag including a deformable bag and an inflatable space;   when pressure outside said air bag increasing, said deformable bag shrinking; when pressure outside said air bag decreasing. said deformable bag expanding;   wherein said air bag being positioned in said liquid storing space and said air bag being movable therein.   
     
     
         2 . The water storage tank for water purifying system as claimed in  claim 1 , wherein said solid housing includes a bucket and a cover. 
     
     
         3 . The water storage tank for water purifying system as claimed in  claim 2 , wherein said bucket and said cover are combined as one integral structure by screw threads. 
     
     
         4 . The water storage tank for water purifying system as claimed in  claim 2 , wherein said connecting portion has two ends, one end connects to said liquid storage space and the other end is provided for connecting to a water output pipe of a water purifying system. 
     
     
         5 . The water storage tank for water purifying system as claimed in  claim 2 , comprising two connecting portions, one of said connecting portions having two ends, one end connecting to said liquid storage space and the other end being provided for connecting to a water output pipe of a water purifying system; the other one of said connecting portions connecting to a water output element.