| 摘要 |
A filtering device comprising a cylindrical housing having an upper open end and a lower closed end, an outer annular pleated filter element located within the housing adjacent the wall of the housing and an inner pleated filter element mounted concentrically within the outer filter element, the inner filter element being provided with a central open area, a disk extending across the open end of the housing and having inlet openings communicating with the upper end of the outer filter element, a barrier for preventing the outer pleat edges of the inner filter element from penetrating into the spaces between the inner pleat edges of the outer filter element, the disk having an outlet which communicates with the inner filter element, whereby dirty oil can flow through the inlet openings into outer triangularly shaped spaces in the outer annular filter element downwardly to the lower end of the housing and into the annular open area, from the open annular area into inner triangularly shaped spaces of the inner filter element, through the inner filter element and into outer triangularly shaped spaces of the inner filter element and upwardly to the upper end of the housing and out through the outlet opening in the disk. Alternatively, the oil can pass from outer triangularly shaped spaces of the outer filter element, through the outer filter element itself and into the inner triangularly shaped spaces of the outer filter element and upwardly to the space above the inner filter element and out through the outlet opening.
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