| 摘要 |
<p>A filter cartridge, which includes: a cylindrical external protecting net (3); a top end cap (2) and a low end cap (8) locate at two ends of the external protecting net; and a cylindrical central tube (5) locates in the interior of the external protecting net, a seal (1) locates at the outboard of the top end cap, the cross section of the external protecting net and the central tube are concentric circles, and there is a filter paper between the external protecting net and the central tube, wherein: at least one annular groove using for setting the seal is located on the upper face of the top end cap, the groove can be continuous or intermittent, at the bottom face of the seal locate many bulges using for fitting together with the groove; the bulges insert in the groove, and bind with the top end cap by the adhesion agent locating between the groove and the seal. Because of the groove adhesion structure, which results in the adhesion between the seal and the top end cap firmer, good gas tightness, and increases the intension of the upper face, and avoids the slip of the seal, the service life of the filter cartridge gets longer.</p> |
