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    公开(公告)号：US2754002A

    公开(公告)日：1956-07-10

    申请号：US27181852

    申请日：1952-02-15

    Applicant: GEN MOTORS CORP

    Inventor： GRETZINGER JOHN R ,  CHEA JOSEPH A ,  HANSON MILES G

    IPC: B01D29/21 ,  B01D35/147

    CPC classification number: B01D29/213 ,  B01D35/147 ,  B01D35/157

    Abstract: 678,938. Filters;. filtering media. GENERAL MOTORS CORPORATION. Nov. 2, 1949 [Nov. 4, 1948], No. 28049/49. Class 46 A filter unit comprises a polygonal bellows filter element having series of transverse pleats, and a pair of end plates to which the end pleats of each series are bonded, e.g. by a thermosetting resin, the overlapping portions of adjacent end pleats being bonded together and to the end plate. The upper joint is made ,by applying annular bands of adhesive resin material 74, Fig. 5, to the upper end of a bellows 41 of resin-impregnated filter paper and to the lower surface of an. upper end plate 44. Segmental clamping fingers 75, Fig. 4, are then moved inwardly into the last fold of a pair of opposed pleats of fingers 76, Fig. 4, is then moved inwardly the bellows 41; a second pair of clamping below the second pair of opposed pleats to engage a square portion of double thickness and the pairs of fingers 75, 76 are clamped axially against the plate 44 in a fixture (not shown). When heat and pressure are applied the overlapping portions of adjacent pleats seal together at least at the apices of the triangles opposite the folds 78, and preferably along the whole length of both lines 77. The square portions engaged by fingers 76 seal together as shown in Fig. 1. When incorporated in a filter 10, Fig. 1, the bellows is surrounded by a perforated tube 60 between end plates 44 and 62, and encloses a tube 42 perforated at 43 to which the plates 44 and 62 are welded. The unit is held against a flange 26 on a hollow post 24 by a gasket-retaining member 54 and by a spring 70 acting between a retaining bolt 35 and a washer 69. Oil passes from an inlet 15 through the unit and into the post 24 through a small orifice 28, finally reaching an outlet 22. A spring- loaded byepass valve 38 is provided. A finger-piece 67 for withdrawal of the unit from the post is also provided. In a modification (not shown) for shunt-flow filtration, the byepass valve is dispensed with and a small hole is provided in the gasketretaining member 66 near the gasket 65. The washer 69 in that case is enlarged so that its clearance from the cylindrical part of the member 66 is less than the diameter of the small hole. Specification 678,939 is referred to.

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