Improvements in Apparatus for Filtering Water or other Liquids for Feeding Boilers or other purposes.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Filtering Water or other Liquids for
Feeding Boilers or other purposes.
I, ROBERT TWENTYMAN NAPIER, of 75, Bothwell Street, in the County of
Glasgow, North Britain, Engineer, do hereby declare the nature of this inven-
to be as follows, that is to say:-
This invention has for its object the construction of improved and simple
apparatus specially designed for filtering feed water for steam boilers but also
applicable for filtering water or other liquids for various purposes.
The improved apparatus is contained in a drum-like casing formed with inlet
and outlet nozzles for pipe connections, and provided with a cover which is secured
preferably by hinged screw bolts. The filtering material is a suitable woven
fabric which is supported by a series of concentric annular shells of perforated
or permeable metal of conical form. When extended the filtering cloth is in the
form of a comparatively long cone (like an ordinary domestic jelly bag) but to
get it into a compact and convenient form it is turned or folded alternately
inwards and outwards so as to form a concentric series of alternately reversed
conical frustra. The supporting permeable metal shells are in the form of conical
frustra, united in pairs (excepting the central and outermost ones); and inserted
between the folds of the filtering cloth alternately from opposite sides. The
combination of filtering cloth and supporting cones is held between two gratings,
the upper one being made with a flange which is with packing made to form. a
watertight joint with a flange formed round the interior of the casing. The water
to be filtered enters the casing above the upper grating and passes through the
grating to the spaces between the filtering cones. The lower grating is con-
nected to the upper grating by means of a central rod and screw nuts, and the
filtered water passes through to the space in the casing communicating with the
outlet. On the cover of the casing being removed the upper grating having
attached to it the lower grating with the parts between them can be taken out
for inspection, cleansing, or repairs.
Dated this Twenty first day of July 1899.
EDMUND HUNT,
Applicant's Agent.
Improvements in Apparatus for Filtering Water or other Liquids for
Feeding Boilers or other purposes.
1, ROBERT TWENTYMAN NAPIER, of 75, Bothwell Street, in the County of
Glasgow, North Britain, Engineer, do hereby declare the nature of this inven-
[Price 8d.]

page_text: tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, that is to say:-
This invention has for its object the construction of improved and simple
apparatus specially designed for filtering feed water for steam boilers but also
applicable for filtering water or other liquids for various purposes.
The improved apparatus is contained in a drum-like casing formed with inlet
and outlet nozzles for pipe connections and provided with a cover. The filtering
material is a suitable woven fabric which is supported by a series of concentric
annular shells of perforated or permeable metal of conical form. The filtering
cloth is turned or folded alternately inwards and outwards so as to form a con-
centric series of alternately reversed conical frustra. The supporting permeable
conical shells are inserted between the folds of the filtering cloth alternately from
opposite sides. The combination of filtering cloth and supporting cones is held
between two gratings connected together by means of a central rod and screw
nuts, the upper grating being made with a flange which is, with packing, made
to form a watertight joint with a flange formed round the interior of the casing.
And in order that my said invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings
to be hereinafter referred to in describing the improvements.
The figure in the drawings shows an example of the improved apparatus, half
of the section being through the casing only, and the other half through the
inner parts.
According to my invention the improved apparatus is contained in a drum-
like casing, A, formed with inlet and outlet nozzles, B, C, for pipe connections,
and provided with a cover, D, which is secured preferably by hinged screw bolts
one, E. of which is shown in the figure. The filtering material, G, is a suitable
woven fabric which is supported by a series of concentric annular shells, H, of
conical form, and made of perforated or permeable metal, preferably in the form
of wire gauze or netting. When extended the filtering cloth, G, is in the form of
a comparatively long cone (like an ordinary domestic jelly bag) but to get it into
compact and convenient from it is turned or folded alternately inwards and out-
wards, as shown, so as to form a concentric series of alternately reversed conical
frustra. The supporting permeable metal shells, H, are in the form of conical
frustra, united in pairs at their top and bottom ends, and inserted between the
folds of the filtering cloth alternately from opposite sides. The supporting
shells or cones, H, fit closely to the filtering cloth, G, but in order to show
the parts clearly they are shown a little apart from the filtering cloth. The
combination of the filtering cloth, G, and supporting cones H, is held
between two gratings J, K, which are arranged to bear against the uniting
ends of the cones. The gratings, J, K, are connected together by a central
rod, L, screwed at each end and provided with adjusting or holding
nuts, M, N, and collars or washers, P, are fitted on the rod so as to bear on the
ends of the central supporting cones. The upper end, Q, of the outer portion
of the filtering cloth, G, is fixed or lashed to the upper grating, J, by means of
cord or other suitable binding material and the lower end, R, of the central
portion of the cloth is similarly fixed to the central rod, L. The upper grating, J,
is made with a flange, S, which is fitted to a flange, T, formed round the interior
of the casing, A, packing, U, being inserted between the flanges so as to form
a watertight joint. The cover, D, is provided with a central punching screw
bolt, V, having an adjusting or holding nut, W, and when the cover is screwed
down the head, X, of the bolt presses against the end of the box nut, M, bearing
on the grating, so as thereby to press the grating flange, S, firmly against the
packing, and form the watertight joint as required. The water to be filtered
enters the apparatus by the inlet, B, and passes through the upper grating, J,
to the spaces between the filtering cones, G, thereafter passing through the filter-
ing cloth and collecting as filtered water in the space in the casing communi-

page_text: upwards through the apparatus, instead of downwards as described, the water
rge outlet, C. If desired the water may be arranged to flow
entering by the opening, C, and then passing through the filtering cloth to be
discharged through the upper opening, B. On the cover, D), of the casing being
removed the upper grating, J, having attached to it the lower grating, K, with
the filtering parts between them, can be conveniently taken out for inspection,
cleansing, or repairs.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
-
In apparatus for filtering water or other liquids for feeding boilers or other
purposes, a long conical bag consisting of woven fabric, and turned or folded
alternately inwards and outwards so as to form a concentric series of alternately
reversed conical frustra, combined with a series of concentric conical annular
supporting shells of perforated or permeable metal substantially as and for the
purposes hereinbefore described with reference to the accompanying drawings.
Dated this Eighteenth day of April 1900