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| Method for the preparation of physiological effectors |
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| Process for the production of maleic anhydride |
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| Decaffeination process |
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| Method of using developer-finisher compositions for lithographic plates |
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| Propylene carbonate recovery process |
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| Solvent stabilization process and method of recovering solvent |
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Filter with axially shiftable rotating backwash selector
| Details |
Inventors: Rishel, John W.;
Assignee: Dover Corporation (Portage, MI)
Primary Examiner: Miles; Tim R.
Assistant Examiner: Clements; Gregory N.
Attorney, Agent or Firm: Blanchard, Flynn, Thiel, Boutell & Tanis
A filter assembly including a housing with a plurality of individual filter units circumferentially arranged within the housing. The housing is compartmented to channel a contaminated fluid to be filtered in a filtering direction through the filter units, from one end thereof to the other. A rotatable, conduit-like backwash arm is disposed in at least one end of the housing for sealed engagement with the contaminated fluid inlet, end of a filter unit and for receiving a backwashing fluid flow therefrom. A rotatable discharge pipe connects to the outlet end of the arm and extends from the housing through a rotary-axial bearing and seal unit thereon, and is coaxially arranged with respect to the circumferential array of filter units. A rotation indexing unit adjacent the housing engages the discharge pipe for angularly shifting said backwash arm from filter unit to filter unit and thereby for backwashing of said filter units in a desired sequence. An axial shift unit engages the discharge pipe for axially shifting the backwash arm away from the filter units preparatory to each angular shift, and for axially shifting the backwash arm into sealed engagement with a new filter unit following such an angular shift. A control coordinates actuation of the rotational indexing unit and axial shift unit for sequentially backwashing filter units of the array. In a modification, a rotatable backwash arm is provided at each end of the array of filter units, movement of the arms being synchronized and the arms being axially opposed for sequentially backwashing the filter unit with a backwashing fluid other than the filtered fluid. In a further modification, the axial shift unit comprises a camming device directly responsive to rotation of the discharge pipe for carrying out the axial shifting of the backwash arm. |
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DETAILED DESCRIPTION FIG.
1 discloses a filter assembly 10 embodying the present invention.
The filter assembly 10 includes a housing 11 with a cylindrical intermediate portion 12 and opposed end portions, or heads, 13 and 14.
In the embodiment shown, the housing 11 is horizontally disposed and carried by a frame 15, here comprising a plurality of support legs.
A platelike partition 16 (FIG.
2) is fixed within the housing 11 and divides same axially into opposed internal chambers, or compartments, 18 and 19.
An inlet pipe 22 connects to the housing 11 and communicates with the chamber 18 for supplying a suitable contaminated fluid, such as a contaminated liquid, to be filtered.
An outlet pipe 23 communicates with the other chamber 19 for discharging filtered fluid, or filtrate, from the housing 11.
A plurality of separate filter units 26 are circumferentially spaced from each other in a circular array in chamber 19 as indicated in FIG.
3.
The filter units 26 are preferably of identical construction.
Thus, a given filter unit 26 includes an impervious tubular shell 27 disposed within the outlet chamber 19 and fixed to and extending from the partition 16.
In the embodiment shown, a mounting member 17 divides the outlet chamber 19 into central and end portions and fixedly connects the adjacent end of the shell 27 to the peripheral wall of the housing 11.
A coaxial mounting ring 32 is fixed, as by welding, coaxially to such end of the shell 27 and here to the mounting member 17 in surrounding relation to a circular opening 33 therethrough.
A central opening 30 in the mounting member 17 connects the central and end portions of outlet chamber 19.
However, a preferred embodiment omits the mounting member 17 and mutually abuts the rings 32, which preferably are tack welded to each other, to form a rigid array of filter units.
The shell 27 defines a filter chamber 28 therewithin.
The remaining open end portion 29 of the shell 27 is substantially conical and is fixed, as by welding, to the partition 16 in coaxial communication with an opening 31 through the partition 16
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Liquid Purification 
