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    Continuously and automatically cleaning multicellular filters
    21.
    发明授权
    Continuously and automatically cleaning multicellular filters 失效
    连续自动清洗多细胞过滤器

    公开(公告)号：US3392835A

    公开(公告)日：1968-07-16

    申请号：US44838665

    申请日：1965-04-15

    Applicant: BRASCO SA

    Inventor： JEAN-JACQUES ASPER

    IPC: B01D29/11 ,  B01D29/15 ,  B01D29/52 ,  B01D35/12 ,  B01D36/02 ,  B01D36/04 ,  B01D37/02

    CPC classification number: B01D29/15 ,  B01D29/114 ,  B01D29/52 ,  B01D29/6438 ,  B01D29/668 ,  B01D29/885 ,  B01D29/904 ,  B01D29/94 ,  B01D35/12 ,  B01D36/02 ,  B01D36/04 ,  B01D36/045 ,  B01D37/02 ,  B01D2201/0453 ,  B01D2201/287

    Abstract: 1,052,157. Automatically-cleaned filters for liquids. BRASCO S.A. April 14, 1965 [April 17, 1964], No. 15986/65. Heading B1D. Unfiltered liquid introduced at 5 passes outwards through a perforate screen 6 into a common admission chamber 3 and passes thence through annular passages 12a &c., each surrounding a tubular member 10a &c., acting as a holder for a porous filter element 11a &c., depending into a sector-shaped cell 1a &c. From all but one cell the liquid filters inwards through the element to reach a common exit chamber 4 having an outlet 7. One element at a time (e.g. 11a, as shown) is cleaned by engagement of a rotating cam 16 with the stem 15a of a valve 14a permitting communication between cell 1a and a common discharge chamber 8 having an outlet 9. The cam is so shaped that the valve is first suddenly opened to its maximum extent and for a short time only, then suddenly partially closed, being maintained in this partially closed position for an appreciably longer time, and then closed for the remainder of the cycle. In the first of these stages, a transient pressure-reversal occurs across the filter element, sufficient to dislodge the cake without much loss of filtered liquid; in the second stage the extent of valve opening ensures pressure-equalisation across the element, so that the element is washed by flow of unfiltered liquid along it from annular passage 12. In the third stage normal filtering occurs, so that where twelve elements are provided the first two stages together occupy only one twelfth of the cycle for any one element. A more complex embodiment is described, its main differences from Fig. 1 being (a) the provision of several (e.g. seven) filter elements per cell; (b) the provision of a woven sheath on each element as actual filtering surface, of such a size that it has one or more folds under inlet pressure, and blows out to break up the cake on pressure reversal; (c) the provision of a resilient disc, with a central hole, in the upper end of each tubular member, so arranged that the hole is enlarged by liquid flow in the "backflush" stage only, to provide greater backflow. Where a granular filter adjuvant is used, the outlet 9 may be connected to a hydrocyclone or similar device, (Fig. 10, not shown), from which a "residue" fraction and an "adjuvant" fraction are discharged separately, the latter preferably being re-circulated by a pump to inlet 5. Further cams may be provided to effect simultaneous cleaning of several cells.

    Backwash means for an open ended multiple tube filter assembly
    22.
    发明授权
    Backwash means for an open ended multiple tube filter assembly 失效
    反冲洗装置用于开放式多管式过滤器组件

    公开(公告)号：US3318452A

    公开(公告)日：1967-05-09

    申请号：US52427666

    申请日：1966-02-01

    Applicant: ADAMS RENARD P

    Inventor： ADAMS RENARD P

    IPC: B01D29/11

    CPC classification number: B01D29/114 ,  B01D29/52 ,  B01D29/668 ,  B01D2201/0453 ,  B01D2201/282

    Abstract: The invention is a development of the apparatus of Specification 982425, the new features being (a) two concentric sets of filter tubes, those in one set being staggered in relation to those in the other set; (b) a central tubular member extending through the outlet chamber and providing communication from the inlet end of the housing to the other end; (c) the provision of bearings for the back-wash tube at both ends of the housing, the backwash tube extending through the above-mentioned tubular member; (d) the provision of two hollow radial arms of unequal length extending from the back-wash tube at each end of the outlet chamber, the longer arm communicating with the outer set of filter tubes and the shorter with the inner set, at each end. Thus each filter tube is open at both ends, and during back-washing filtrate and residue are discharged from both ends simultaneously.

    Sleeve filters and cleaning means therefor
    23.
    发明授权
    Sleeve filters and cleaning means therefor 失效
    套筒过滤器和清洁装置

    公开(公告)号：US3267649A

    公开(公告)日：1966-08-23

    申请号：US41006064

    申请日：1964-11-10

    Applicant: GEORGES VICARD PIERRE

    Inventor： GEORGES VICARD PIERRE

    IPC: B01D29/11 ,  B01D46/02 ,  B01D46/04

    CPC classification number: B01D46/0067 ,  B01D29/117 ,  B01D29/52 ,  B01D29/668 ,  B01D29/902 ,  B01D46/02 ,  B01D46/04 ,  B01D46/4272 ,  B01D2201/0453

    Abstract: 1,021,987. Gas-filters. P. G. VICARD. Nov. 23, 1964 [Nov. 25, 1963; March 5, 1964], No. 47551/64. Heading BIT. In a gas-filter comprising a plurality of openended filter sleeves 8, 9 which each extend from an inlet chamber 4a or 4b to a common dustcollecting hopper 10, gas flows from inlet 6 down and through one set of sleeves 8 and hence into hopper 10 and up into sleeves 9, this order being abruptly reversed periodically by means 7, causing elements 8 (for example) to contract under the resulting reduced pressure wave, breaking up any solids deposited thereon. Filtered gas which has passed outwards through sleeves 8, 9 leaves at 13. The through passage of the sleeves may be annular in section by virtue of solid cores 15, and helical flow may be imparted by vanes 14 as gas enters the sleeves. To increase the "through velocity" of the gas in sleeves 8, 9 a recirculation line 17, 18, 19 may be connected as shown or inlet 17 may connect to the inlet chamber 4a or 4b which is currently cut off from inlet 6 by hinged shutter 7. An alternative embodiment, Figs. 4-6 (not shown), comprises radially separated inlet chambers each having its own inlet valve and leading to one sleeve element, one valve out of the six being open at any one time, so that the element on 'through flow" carries the whole gas input to the others. A rotary distributer could replace the valves.

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