Patent ID: 7261816

Claim:
An ion-exchange filter for a fuel cell system comprising: a case having an inlet through which a fluid flows thereinto and an outlet through which the fluid flows out therefrom; and two cartridges, each of the two cartridges being exchangeable for one another disposed in the case and filled up with an ion-exchange resin, said case including a bottomed cylindrical case body to which said inlet is formed and a lid, mounted to be detachable to the case body, to which said outlet is formed, in which the case body is provided with a projected portion projecting inward the case body at a portion of the case body bottom corresponding to the inlet, said two cartridges including a pressure-loss emphasizing type cartridge and an ion-exchange efficiency emphasizing type cartridge, which are exchanged with each other, and in which the ion-exchange efficiency emphasizing type cartridge is one for an ion-exchange filter having a high pressure loss and high ion-exchange efficiency and, on the other hand, the pressure-loss emphasizing type cartridge is one for an ion-exchange filter having a pressure loss lower than that of the former ion-exchange filter and an ion-exchange efficiency lower than that of the former ion-exchange filter, wherein each of the two cartridges has axial one end to which a recessed portion into which said projected portion of the case body is inserted and axial another end to which a projected portion is formed, when the selected either one of both the cartridges is mounted to the cases, the projected portion of the case body is inserted into the recessed portion of the selected cartridge and the projected portion of the selected cartridge is inserted into the outlet of the case so that the selected cartridge is mounted or dismounted to the case together with the mounting or dismounting of the lid to the case body so that either one of the pressure-loss emphasizing type cartridge and ion-exchange efficiency emphasizing type cartridge is selectively mounted to the case.