초록 ▼

A filter device including means to produce an air actuated purge for backwashing a filter assembly including a double sieve basket having a flexible filter between the double baskets. The backwash removes caked contaminant from the filter and baskets. The purge uses only the quantity of liquid in th

A filter device including means to produce an air actuated purge for backwashing a filter assembly including a double sieve basket having a flexible filter between the double baskets. The backwash removes caked contaminant from the filter and baskets. The purge uses only the quantity of liquid in the housing and a blast of air to backwash the filter. The pressurized air causes roiling of the liquid and accelerates the blowing through the sieve baskets and flexible filter for the backwash to remove and loosen the contaminants. The air which follows the liquid through the filter assembly further loosens and then removes the remainder of the contaminants.

대표청구항 ▼

A method of backwashing a filter device, said filter device having an inner and an outer basket with a flexible filtering element retained between said baskets, said filter element being located in a housing to define an outlet chamber for a clean liquid inside of said inner basket, and an inlet cha

A method of backwashing a filter device, said filter device having an inner and an outer basket with a flexible filtering element retained between said baskets, said filter element being located in a housing to define an outlet chamber for a clean liquid inside of said inner basket, and an inlet chamber between said housing and said outer basket, said method comprising the following steps: a) introducing liquid to be filtered into said inlet chamber; b) passing said liquid through said outer basket, said filtering element, and said inner basket into said outlet chamber; c) delivering filtered liquid from said outlet chamber out of said housing; and d) interrupting the filtering sequence of steps a, b and c then causing a blast of pressurized air to enter said outlet chamber and passing said pressurized air and the filtered clean liquid to flow in a reverse direction through said inner basket, said filtering element, said outer basket into and through said inlet chamber to flush accumulated filter cake from said filtering element and said outer basket and out of said housing to be disposed of, said pressurized air continuing to pass through said inner basket, said filtering element and said outer basket for a predetermined time period after the reverse flow of fluid is expelled from the housing.