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    • 5. 发明专利
    • Improvements in or relating to the filtering and like treatment of liquids
    • GB495112A
    • 1938-11-08
    • GB1342737
    • 1937-05-11
    • PINCHIN JOHNSON & COMPANY LTDWILLIAM JAMES FORREST
    • B01D29/05B01D29/15
    • 495,112. Filters or strainers. PINCHIN, JOHNSON, & CO., Ltd., and FORREST, W. J. May 11, 1937, Nos. 13427 and 18113. [Class 46] A stationary filtering element is cleansed by a reverse flow of filtrate under pressure from a header which moves over the filtrate side of the element, the matter so detached separating by gravity in the liquid to be filtered. Fig. 2 shows an inward-flow cylindrical element 1 with a wedge-shaped header 8 fixed to a hollow rotatable shaft 9 through which a portion of the filtrate can be pumped back. As shown, the liquid to be filtered is supplied through inlets 4, 5 to the upper portion of the casing and the solid matter detached from the element falls to an outlet 6a, but when the separated impurities are lighter than the liquid, lower inlets are provided and the impurities detached from the filter rise to the top. Fig. 3 shows a disc-shaped element 22 through which the liquid filters upward from an inlet 24a to an outlet 23a. Filtrate is forced back through a rotatable shaft 29 and a segmental header 25. As shown in Fig. 6, a cylindrical filter element is cleansed by a flow of filtrate through a longitudinally reciprocated hollow shaft 42 and a piston 39 comprising hollow spokes and a peripheral channel 40. A pump which draws liquid through the filter may be used to supply under pressure the filtrate used for cleansing. It is stated that the header may take the form of a hollow Archimedean screw with a series of openings or a continuous opening in the outer portion of the screw which moves over the surface of a filter drum. It is also stated that the parts above the container 24 of the apparatus shown in Fig. 3 might be arranged as a movable unit with flexible pipe connections and a flexible drive for the shaft so that the device might be immersed in a separate vessel containing the liquid to be filtered.
    • 8. 发明专利
    • Improvements in or relating to pumps for filter presses and the like
    • GB417344A
    • 1934-10-03
    • GB1317733
    • 1933-05-05
    • HENRY HERBERT DAVISS H JOHNSON & COMPANY LTD
    • F01B11/00F01L25/06
    • 417,344. Steam pumps. DAVIS, H. H., 2, Woodstock Gardens, Goodmayes, Essex, and JOHNSON & CO., Ltd., S. H., Carpenters Road, Stratford, London. May 5, 1933, No. 13177. [Classes 122 (ii) and 122 (iii).] In a pump of the kind described in Specification 398,684, [Group XXVIII], the main valve 15 is controlled by a combined fluid actuated and mechanical valve gear, and cushioning of the piston 5 at the ends of the stroke is effected, on the up-stroke, by air supplied through ports 4 situated at a distance from the top of the cylinder and, on the down-stroke, by exhaust steam cushioned by the main piston overrunning separate exhaust ports 3 spaced from the cylinder ends. The piston-rod 6 lifts the weight, and through tappets actuates an auxiliary slide valve arranged by the side of the main valve. The main valve 15 controls separate admission and exhaust ports 2, 3 at the bottom of the main cylinder, and the auxiliary slide valve controls separate admission and exhaust passages leading to the ends of the auxiliary cylinders housing the heads of the piston 14 which actuates the main valve. The piston 14 overruns the separate auxiliary exhaust ports and effects the cushioning of the main valvo.