Filtration cartridges with metallic end members and method of manufacturing

Abstract

The filtration cartridge comprises a filtration element and a heat-resistant extension band having a first and a second longitudinal edge. The first edge of the extension band is attached along an edge of the filtration element. In a first embodiment, a metallic cast end member is formed by immersing the second edge of the extension band into molten metal. The molten metal is then allowed to solidify with the second edge of the extension band embedded therein. In a second embodiment, the extension band is squeezed on a porous inner core and an end plate is welded on the end of the inner core. Providing filtration cartridges with a metallic end member allows increasing their resistance to mechanical shocks and increasing their maximum operating temperatures.

1 - 25 . (canceled)  
   
   
       26 . A filtration cartridge comprising: 
 a hollow cylindrical filtration element having two opposite edges;    a rigid, heat-resistant and porous inner core coaxially disposed inside the filtration element, the inner core having two opposite ends;    two heat-resistant extension band having a first and a second longitudinal edge, the first edge of the extension band being attached along a corresponding edge of the filtration element, the extension band being squeezed around a corresponding end of the inner core; and    two metallic end plates, each welded at a corresponding end of the inner core;    whereby the ends of the inner core are closed by the extension bands and the end plates.    
   
   
       27 . The filtration cartridge according to  claim 26 , wherein each extension band is made of a metal sheet.  
   
   
       28 . The filtration cartridge according to  claim 27 , wherein the extension band has a thickness between 20 and 500 microns, and a width between 5 and 150 mm.  
   
   
       29 . The filtration cartridge according to  claim 26 , wherein the filtration element includes a porous fabric.  
   
   
       30 . The filtration cartridge according to  claim 29 , wherein the filtration element is pleated and shaped to form a hollow cylinder.  
   
   
       31 . The filtration cartridge according to  claim 30 , wherein the inner core comprises a cylindrical metallic supporting mesh.  
   
   
       32 . The filtration cartridge according to  claim 29 , wherein the first edge of each extension band overlaps the corresponding edge of the filtration element and is attached to the filtration element using at least one sewing thread.  
   
   
       33 . The filtration cartridge according to  claim 32 , wherein the sewing thread is a metallic wire.  
   
   
       34 . The filtration cartridge according to  claim 26 , wherein the extension band is squeezed around a corresponding end of the inner core by a metallic belt.  
   
   
       35 . A method of providing a metallic end member at an edge of a filtration element, the method comprising: 
 attaching a heat-resistant extension band along the edge of the filtration element, the extension band having a first and a second longitudinal edge;    pleating and shaping the filtration element and the extension band as a hollow cylinder;    inserting a rigid metallic and porous inner core inside the cylinder; squeezing the extension band on an end of the inner core; and welding an end plate on the end of the inner core.