9、根据权利要求3所述的一种组合式空气滤芯,其特征在于:所述第四滤芯内

9. A combined air filter element according to claim 3, characterized in that: the inner peripheral support frame (9) of the fourth filter element and the inner peripheral support frame (8) of the third filter element have the same shape and are symmetrically distributed , The inner peripheral support frame (8) of the third filter element is distributed with a number of semicircular or arc-shaped transverse ribs (14) from top to bottom, and the transverse ribs (14) are equally spaced, and each transverse rib ( The two ends of 14) are respectively provided with a longitudinal rib (15), the intersection of the longitudinal rib (15) and each transverse rib (14) is fixed to each other to form an integrated structure, and the middle position of each transverse rib (14) is also longitudinally distributed. Longitudinal ribs (15), the intersections of the longitudinal ribs (15) and the transverse ribs (14) are fixed to each other to form an integral structure. ←

9, according to claim 3, a combined air filter, characterized by: the fourth filter inner support skeleton (9), the third filter inner support skeleton (8) shape is the same and symmetrical distribution, the third filter inner support skeleton (8) from top to bottom There are several semi-circular or curved lateral ribs (14), each transverse rib (14) is equally spaced, each transverse rib (14) has a vertical rib (15), vertical rib (15) and each lateral rib (14) The intersection of each other is fixed as an integration structure, the middle position of each transverse rib (14) also has a vertical distribution of a vertical rib (15), the vertical rib (15) and the intersection of the horizontal rib (14) are fixed to each other as an integration structure. ←

9. A combined air filter element according to claim 3, which is characterized in that: the shape of the inner peripheral support framework (9) of the fourth filter element and the inner peripheral support framework (8) of the third filter element are the same and symmetrically distributed; a number of semicircular or arc-shaped transverse ribs (14) are distributed from the top to the bottom of the third filter element, and the transverse ribs (14) are evenly spaced, The two ends of each transverse reinforcement (14) are respectively provided with a longitudinal reinforcement (15), the intersection of the longitudinal reinforcement (15) and the transverse reinforcement (14) is mutually fixed to form an integrated structure, and a longitudinal reinforcement (15) is longitudinally distributed at the middle position of each transverse reinforcement (14), and the intersection of the longitudinal reinforcement (15) and the transverse reinforcement (14) is mutually fixed to form an integrated structure. A kind of<br>