Improvements in Filters for Extracting Grease and other Impurities from Feed Water for Steam Boilers and other purposes.
Year: 1896

page_text: Date of Application, 22nd May, 1896
Complete Specification Left, 22nd Feb., 1897-Accepted, 8th May, 1897
Improvements in Filters for Extracting Grease and other Impurities
from Feed Water for Steam Boilers and other purposes.
We, EDGAR CONISTON MILLS of No. 40 Victoria Buildings, Manchester,
Consulting Engineer, and JOHN GEORGE CHAMBERLAIN of Messrs. Joseph
Wright & Company, Neptune Works, Tipton, Engineer, do hereby declare the
nature of this invention to be as follows:-
Our invention has for its object primarily the extraction of oil or grease front
water whether used for feed for steam boilers or not, and may also be applied to
remove other impurities.
Within a cylindrical vessel we fix an annular perforated plate preferably placed
eccentrically with the vessel. The said plate is less than a complete circle and is
attached at its extremities to the sides or to lugs on the sides of the vessel. The
plate is caused to make a good joint with the floor of the vessel by any suitable
means, such as by planing the edge of the plate and causing it to enter a recess in
the floor and by caulking.
.
An accurately fitting lid or cover is provided for the vessel and secured by
suitable bolts. The inside of the cover is machined so as to accurately fit on to
the upper edge of the perforated plate.
An inlet for the water to be filtered is provided at one side of the vessel and an
outlet at the other.
We do not bind ourselves to make the inlet on any one side of the plate but at
present we believe the concave side to be the best for the inlet. The perforations
are of ample size but a space of about one or two inches from the floor and cover
of the vessel is left without perforations.
Against the plate and extending over the perforations we place a sheet of coarse
wire gauze or netting and against the netting and extending completely across the
plate we place a canvas, asbestos, cotton, linen, woollen, felt or other cloth.
Extending across the inlet portion of the vessel we place another perforated plate,
but in this case the perforations preferably extend to the lower edge of the plate
so as to leave apertures along the floor of the vessel. We fill the space between
the cloth and the last mentioned perforated plate with suitable absorbent material
such as Ene wood shavings, charcoal, coke or other substance.
The filtered water outlet may be placed in any position within the annular space
between the curved perforated plate and the side of the vessel. Into the same
space we connect a steam pipe for the purpose of biowing through the filter to
cleanse it. The floor of the filter between the intake and the straight perforated
plate may be made sunk and at the lowest point we connect a blow-out valve. By
these means when the water inlet and outlet valves are closed the sediment
collected in the ante-chamber may be blown out and also a considerable amount of
the grease and other impurities which collect upon the absorbent material and the
filter-cloth. The filter-cloth and absorbent material may he readily removed by
taking off the upper cover, when the whole of the interior of the vessel can be
cleaned out.
The action is as follows:-
The filter being charged with the absorbent material and filter-cloth, the water
to be cleansed is passed through. The grosser impurities are abstracted by the

page_text: absorbent material and the finer portions by the filter cloth which has a large
surface owing to the form of the perforated plate and through which the water
must pass after being in contact with the absorbent material in the centre part of
the filter. The purified water collects in the annular space and passes out at the
water outlet.
Two or more filters may be used in duplicate or a by-pass be provided in case
only one is employed. They may also be used in "series."
In order to maintain the filter cloth well against the plate and so avoid leakage
we in some cases use an expanding spring ring for the purpose.
Provision is made for applying a soda cup and a pressure gauge.
EDGAR CONISTON MILLS,
Agent to the Applicants.
Improvements in Filters for Extracting Grease and other Impurities
from Feed Water for Steam Boilers and other purposes.
We, EDGAR CONISTON MILLS, of No. 40 Victoria Buildings, Manchester,
Consulting Engineer, and JOHN GEORGE CHAMBERLAIN of Messrs. Joseph
Wright and Company, Neptune Works, Tipton, 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:-
Our invention has for its object primarily the extraction of oil or grease from
water whether used for feed for steam boilers or not and may also be applied to
remove other impurities.
In the accompanying drawings:-
Fig. 1 is a sectional elevation of our improved filter.
Fig. 2 is a plan view the upper half of which is shewn with the lid removed and
the lower half with the lid in position, and
Fig. 3 shews an enlarged view of the filter cloth with its supports.
Within a cylindrical vessel A we fix an annular perforated plate B preferably
placed eccentrically with the inside of the vessel. The said plate is less than a
complete circle and is attached at its extremities to the lugs a on the sides of the
vessel A by the screws P P. The plate is caused to make a good joint with the
floor of the vessel by any suitable means, such as by planing the edge of the plate
and causing it to enter a recess a¹ in the floor and by caulking. a is the inlet for
the unfiltered water and a is the outlet for the filtered water.
Extending across the inlet portion of the vessel A we place another perforated
plate C which is prevented from reaching to the floor of the vessel by suitable
rests c. The space between the cloth and the last mentioned perforated plate is
filled with suitable absorbent material, such as fine wood shavings, charcoal, coke,
sawdust, or other substance.
An accurately fitting lid or cover D is provided for the vessel and secured by
suitable belts E. The inside of the cover is machined so as to accurately fit on to
the upper edges of the perforated plates. The perforations are of ample size but
a space of about one or two inches from the floor and cover of the vessel is left
without perforations.
Against the plate and extending over the perforations we place a sheet of coarse
wire gauze or netting F, and against the netting and extending completely across
the plate we place a canvas, asbestos, cotton, linen, woollen, felt or other cloth G,
and in order to retain it in position while charging the filter and during working

page_text: we form the cloth with a hem and insert into it a spring H of suitable length to
ensure pressure of the cloth against the plate B.
The filtered water outlet a³ may be placed in any position within the annular
space between the curved perforated plate B and the side of the vessel. Into the
same space we connect a steam pipe by the valve J for the purpose of blowing
through the filter to cleanse it. The floor of the filter between the intake and the
straight perforated plate may be made sunk and at the lowest point we connect a
blow-out valve K. By these means when the water inlet and outlet valves are
closed, the sediment collected in the ante-chamber may be blown out and also a
considerable amount of the grease and other impurities which collect upon the
absorbent material and the filter cloth. The filter cloth and absorbent material
may be readily removed by taking off the upper cover when the whole of the
interior of the vessel can be cleaned out.
Lis a cone of wood or other suitable material secured to a plate M. Nare
binding screws each provided with lock nut n the object of which is to cause some
further compression of the absorbent material in the filter by screwing down the
screws N and locking them after the cover D is secured. O is a pressure gauge
for the purpose of shewing the resistance of the filter.
The action is as follows:-
The filter being charged with the absorbent material and filter-cloth_the
water to be cleansed is passed through. The grosser impurities are abstracted by
the absorbent material and the finer portions by the filter cloth which has a large
surface owing to the form of the perforated plate and through which the water
must pass alter being in contact with the absorbent material in the centre part of
the filter. The purified water collects in the annular space and passes out at the
water outlet.
Two or more filters may be used in duplicate or a by-pass be provided in case
only one is employed. They may also be used in "series."
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In filters for extracting grease or other impurities from water the cylindrical
vessel having an inner space bounded by a curved perforated plate against which a
filter cloth is supported, substantially as and for the purposes hereinbefore described
and illustrated in the accompanying drawings.
2. The curved perforated plate fitting into recess in the bottom of the vessel and
with a true upper surface fitting against the cover of the vessel so as to make a
joint at both contacts substantially as and for the purposes hereinbefore described
and illustrated in the accompanying drawings.
3. The curved perforated outlet plate supporting the filter cloth and the straight
inlet perforated plate substantially as and for the purposes herein before described
and illustrated in the accompanying drawings.
4. The curved perforated outlet plate supporting the filter cloth and the straight
perforated inlet plate enclosing a space charged with absorbent material substan-
tially as and for the purposes herein before described and illustrated in the
accompanying drawings.
5. The combination of a body of absorbent material with a filter cloth partially
surrounding the said absorbent material substantially as and for the purposes
herein before described and illustrated in the accompanying drawings.
6. The spring inserted into the hem of the filter cloth substantially as and for
the purposes hereinbefore described and illustrated in the accompanying drawings.
Dated this 20th day of February 1897.
EDGAR CONISTON MILLS,
For the Applicants.