Filter cartridge assembly

Abstract

A filter cartridge assembly is provided. The filter cartridge assembly includes a filter head having an inlet and an outlet, an inner moving up or down in the filter head by an elastic unit, and a locking/unlocking part to control the inner to be stopped in a state that the inner moves up and to move down in state that the inner is stopped such that a filter cartridge is detachably installed in the filter head through the up-down movement of the inner, wherein, in order to allow the inner, which moves up or down in the filter head, to linearly move up only to separate the filter cartridge and to prevent the filter cartridge from being arbitrarily separated when the inner moves down. The inner includes an inner main body, and a holder including a plurality of wing pieces, in which the holder formed on a lower end of the inner main body are provided with the wing pieces which are spaced apart from each other to operate inward and outward, respectively, when the inner moves up or down. Each of the wing pieces includes a protrusion for inducing the inner to be retracted inward while tightly making contact with an inner wall of the filter head when the inner moves up, and a holder protrusion formed at an opposite side of the protrusion to hold the filter cartridge. The protrusion of the wing piece releases an operation of the holder protrusion holding the filter cartridge in a state that the inner moves down, and the filter head is provided with an inner groove rim on a portion at which the protrusion is placed in the state that the inner moves down such that the protrusion is inserted into the inner groove rim to be latched to the inner groove rim, thereby preventing the inner from being arbitrarily separated from the filter head.