Improvements in Filtering Apparatus.
Year: 1891

page_text: Date of Application, 2nd June, 1891-Accepted, 15th Aug., 1891
COMPLETE SPECIFICATION.
Improvements in Filtering Apparatus.
A communication from abroad by JUNIUS ALBERT BOWDEN, of 104, Joy Street,
Detroit, in the County of Wayne and State of Michigan, United States of
America, Manufacturer of Filters.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both
in the County of Lancaster, and 323, High Holborn, in the County of Middlesex,
Civil Engineer, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
It is the purpose of this invention to produce a filter adapted for filtering with
rapidity a large body of water, and adapted for cleansing the filter bed with great
rapidity, and possessing features of advantage with respect to its filtering and
cleansing mechanism, as will be hereinafter more fully explained.
In the drawings,
Figure 1 is a perspective view, partly in section, of a horizontal filter embodying
the invention.
Figure 2 is a perspective view of a vertical filter embodying the invention.
Figure 3 is a section by a vertical plane through the filter shown in Figure 1.
Figure 4 is an enlarged sectional view of the perforated strainer at the base of
the filter.
Figure 5 represents a variation in which there are shown several wash pipes side
by side, immediately above the shields at the base of the filter.
Figure 6 shows the perforated pipe F without any interior valve for closing its
orifices when not in use.
Figure 7 shows the same with the interior valve for closing the orifices.
Figure 8 shows a similar arrangement where the interior valve shifts longitu-
dinally to close the orifices.
In the drawings,
A represents the filter case, B the water inlet conduit, C the filtered water outlet,
D is the drain, E is a centrally located surface wash, F is a rotary perforated wash
pipe, F is an exterior handle by which the said perforated pipe may be rotated,
is an interior valve for closing its orifices, which valve may be actuated by
an exterior handle shown in Figure 7, this is a rotary valve, and whether the
orifices are closed or open is shown by an index finger f³, a similar valve fis
shown in Figure 8, adapted to open and close the orifices by a longitudinal shift of
the valve. G is a slitted or perforated strainer. G' shown in Figure 4 is an
interior, rotary nozzle, whereby a stream of wash water may be directed outwardly
through any desired part of the perforated strainer, and be compelled to pass
through that portion of the strainer immediately opposite the nozzle. G³ is an
exterior handle for rotating the nozzle. G³, Figure 4, is an interior valve adapted
to close one or more orifices g, and G' is an exterior handle whereby this handle
may be opened or closed, and with an indicator g' for indicating whether it is in
ts opened or closed position. The purpose of this valve is as follows:
In washing the filter, it is desirable that wash water passing through the interior
ozzle G'shall find an outlet through no other channel than the nozzle, so as to
concentrate its stream against and thoroughly wash the section immediately opposite
he discharge orifice of the nozzle, but when the apparatus is filtering water, it is
desirable that all of the perforations in the strainer G shall be open to lead off
iltered water. Therefore, the passages y are provided, and adapted to be opened
TD 017

page_text: by shifting the valve G³, thus permitting the whole strainer to act, and permitting
the filtered water to enter freely into the nozzle section G', and thence off through
the filtered water conduit.
H is a shield located immediately above the strainer, and adapted to sustain
the weight of the superincumbent filter, bed. J represents the filter bed proper,
and is coarse granular filtering 'material located about the strainer G. There
may be one perforated wash pipe, as shown in Figures 1, 2 and 3, or there may be
several such wash pipes, as shown in Figure 5, and if there are several, they may, if
desired, be geared together by suitable gears F2 F3, and actuated by a common
crank or other actuating device F. K is a vent valve preferably automatic,
adapted to admit air into the filter case above the filter bed when water is drained
therefrom.,
dis a valve governing, the branch D" of the drain pipe which leads to the surface
of the filter bed. is a valve governing the branch D of the drain pipe which
leads to the top of the filter case. is a valve which, when in the position shown
in Figure 2, will admit water through B into the top of the filter case and cut it off
from the portion B' of said pipe, this being its position when the device is 'filtering
water. When the valve is in line with the pipe B', the inflow of water is cut off
at the top of the case; and the flow of water is directed through the said pipe 3.
is a valve in the filtered water outlet, which is open when the apparatus is
filtering, and closed when 'the-filter bed is being cleansed. c,e and are other
valves. It is preferable for the feed water to enter the top chamber of the filter
case through nozzles or perforations' so as to distribute the inflow of water to
different parts of this upper chamber.
The operation of this device is substantially as follows:
The valvese and being closed, the valve open, and the valve in the position
shown in Figure-2 and the drain valves d'and'd being closed, water will enter
through B and into the top chamber of the filter case. It will pass down through
the filter bed, thence through the strainer G, and out through the filtered water
outlet pipe C. When it is desired to wash the filter bed, 'the valve cimay be closed,
the valves and open to the drain, and the valve turned into line with the
pipe B
Water will then enter through B', and will pass thence down,' and will
enter the interior of the nozzle G'. It will pass thence out through the nozzle,
cleansing the opposite portion of the strainer, and the nozzle may be rotated by the
handle G2 until all portions of the strainer have been brought opposite the discharge
end of the nozzle. This water, passing in the reverse direction up through the
filter bed, will cleanse the same and pass off through the drain D, or by closing the
valve' and opening the valve, the wash water may enter through the perforated
pipe or pipes F instead of through the strainer, and this pipe or these pipes F may
be revolved by the exterior landle or crank and caused to direct the stream of
wash water in any direction into the filter bed..
So again, by closing tlie valves and the wash water may enter through the
centrally located surface wash E and immediately above the surface of the filter
Bed, and the valve d'being open, 'the water 'niay be drained down to this level, air
entering at the same time through the vent valve. This will concentrate the
impurities at the surface of the filter, and by means of this surface wash, they may
be driven off through D' into the drain.
It is also apparent that, by closing the valve cand opening the valves cf and:(,
wash water may simultaneously be introduced 'both through the strainer G; the
perforated pipe and the surface wash E, and so 'siinultaneously cleanse the body
of the filtering material and its surface also.
After a filter bed has been cleansed, it is frequently very desirable-to-drain the
filter bed. To accomplish this, it is only necessary to close the drain valves d' d'
and close off the valve b, so as to 'sliut water off from both Band 13: Then by
opening the valve c, the water will be wholly drained 'from the filter case, and as
the level of water descends, the vent valve K'will open, perniitting air to enter,
and the suction created by the descending water will cause the 'air to flow down

page_text: after the same through the entire mass of filter bed, after which the filtering process
may proceed as before.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. In a filter, the combination, with its case, of a water inlet pipe at its top, a
horizontal, perforated, wash pipe at the bottom of the filter bed, a shield beneath
the latter, and a horizontal, perforated strainer beneath the shield, substantially as
described.
2. The combination, with a filter case, of a water inlet pipe at the top, a centrally
located perforated surface wash at the top level of the filter bed, a horizontal per-
forated wash pipe at the base of the filter bed, a shield beneath the latter, a
horizontal perforated strainer beneath the shield, a filtered water outlet leading
therefrom, a surface drain at the top level of the filter bed, and an air vent leading
into the upper chamber of the filter, substantially as described.
3. The combination, with a filter, of a water inlet at its top, a perforated surface
wash at the top level of the filter bed, a horizontal wash pipe at the bottom of the
filter bed, provided with a row of perforations, and means for rotating the pipe
from the exterior, a shield beneath the wash pipe, and a horizontal perforated
strainer pipe at the base of the filter communicating with the filtered water outlet,
substantially as described.
4. The combination, with a filter, of one or more horizontal wash pipes F
located near the bottom of the filter bed, each provided with a row of perforations,
and adapted to be rotated by means projecting to the exterior of the filter case,
substantially as described.
5. The combination, with a filter, of a strainer G at the base of the filter, provided
with an interior nozzle communicating with the filtered water outlet, said nozzle
provided with an extension to the exterior of the case, whereby the nozzle may be
rotated and its discharge orifice brought successively opposite every portion of the
perforated strainer, substantially as and for the purposes described.
6. The combination, with a perforated strainer and interior nozzle, with means
for rotating the nozzle as described, of an opening or openings g and valve G³, the
stem of the said valve projecting to the exterior of the case, whereby the valve
may be caused to open or close the said orifices at the will of the operator, substan-
tially as described.
7. The filter wash pipe F, provided with a row of perforations and an interior
valve adapted to open and close said perforations, said valve provided with a stem
extending to the exterior of the filter case, whereby said valve is actuated, sub-
stantially as described.
8. The combination, with a filter, of a centrally located surface wash at the top
of the filter bed, horizontally perforated, and adapted to direct its stream of wash
water in a horizontal direction across the top surface of the bed from the centre
toward the sides of the case.
D
11
ليوم
1001
WM. P. THOMPSON & Co.,
Agents for the Applicant.