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Multi-stage strainer
Abstracts_. Swimming
of British
pool filter
In BP2210 803 Donco i%:~vtScsdescribe a filtering arrangement for swimming pools, With most filtration systems of this type, the pool is fitted with a peripheral overflow duct from which water is returned to the pool through a pump and filter. Water is passed through the filter in the reverse direction to clean the filter and the dirty water is conveyed to a drain. This arrangement normally requires about 10% of the pool water which must be replaced and reheated. In this invention, the filter is periodically cleaned by reversing the flow, but instead of using warm water from the pool for this purpose, the duct is repeatedly filled with cold water from another source and this is discharged after being used to backwash the filter. (2 figs., 2500 words)
Filtering
a water
sample
In BP2210 805 the Severn-lWnt Water Authority describes a method of indica-
ting the amount of solid matter suspended in a liquid sample using an automated approach. The sample is filtered using a filter CUD having an integral filter paper to which a suction is applied via a Buchner flask; the whole cup and filter paper unit being weighed before and after filtration. Automation of the process is facilitated because the cup is easier to handle mechanically than wet filter paper. This method also eliminates the need to rinse the vessel with pure water to ensure that all the solid matter reaches the filter paper. (2JIgs., 3500 words)
Separator conveyor
for use in installations
In BP221 I 438 G. Mouzon SA Air et Techniques describe a separator for use in conveyor installations where objects are conveyed over distances by pneumatic means. It consists of an inlet leading into a screen of part circular cross section from which the solids fall while air is forced through an outlet. A flap can be pivotally adjusted and the initial part of the screen is made of knitLed wire to present a rough surface to the air. The remainder of the screen is made of perforated metal. (4 figs., 2000 wo7Yi.s)
Exhaust
gas cordtioner
In BP 2210 809 Baker Hughes describe an apparatus for cooling and cleaning hot exhaust gas. It consists of an enclosure partialIy filled with liquid, and a conditioning device incorporaFlItration 8 Separation
March/April1991
Fine grain pigment particle separator
Patents
In Br2.W 1 114 sha& describes
ting a liquid induction section which ensures that the hot exhaust gas is mixed with liquid. This mixture flows through a compact section of the conditioning device for cooling and then goes to a separator where separation of gas and particulates from the liquid takes place by centrifugal action, Tine cleaned gas is then forced to strike an impingement device to remove any additional entrained liquid before being passed to atmosphere. The separated liquid is returned to the enclosure. (5JIgs., 7500 words)
Multi-stage
strainer
In BP2211 105 Edward B. Henzman describes a strainer for paint. It consists of a lidded vessel which supports a stack of fiat filter elements which have progressively decreasing pore sizes. The paint passes through the pores under the force of gravity. The vessel has an outlet pipe leading to a sprayer and may also incorporate an electric stirrer. Filter elements can be removed and may be stacked together or placed in a single housing with the lid. (6figs., 4000 words)
Water
filter
107 Newteam describe a liquid filter apparatus for use in a domestic water supply. It concists of a chamber with inlet and outlet openings in its side walls. The chamber is able to move behveen two positions: the first permits fluid to flow through the chamber, and the second position inhibits the fluid flow. A filter member in the chamber can be removed when tSe sleeve is in the second position and the end cap is removed. An advantage of the apparatus is that there is no need for a separate liquid cut - off valve. (2 sig., 2000 words) In BP2211
Filter for fan operates heating system 110 AWed E. Moore describes a filter for a fan-operated heating system consisting of a metal filter screen and a frame for fixing the screen to an existing grill. The metal filter screen is made of wire gauze or perforated metal. The fixing frame has comer and side pieces which are separate from another and which can be telescoped with respect to one another so that the fixing frame can be varied to suit the size of the grill frame. Comer and side pieces are preferably concave in cross section. (7$&s., 2500 words)
In BP2211
Rhodia AktSe-ngesoll-
a method of, and apparatus for, separating coarse grain and agglomerated pigment particles from a suspension containing the aforementioned substances and fine grain pigment particles. A suspension, of titanium dioxide powder and water, for example is introduced via an intake fitting leading into the bottom area of a tank Fixed plates are arranged in the tank parallel to each other and at an angle of 40” to 60”. The suspension is drawn off in the upper region of the tank via an overflow fitting and consists mainly of fine grain pigment particles. The suspension in the bottom region contains mainly coarse grain and agglomerated pigment particles and is drawn off via an outlet fitting. The fine graincd pigment particles are obtained for delustring purposes in the synthetic fibres industry. (Zfigs., 4000 words)
Filter for removing or mist aerosols. In BP2211
437 British
dust Nuclear
Fuels
describe a filter for removing liquid droplets or solid particle aerosols from a gas stream especially in plants where radioactive materials are processed. The filter is formed entirely of stainless steel or layers of a high voidage fibrous material with fibre diameters typically of 4 microns. There are drainage channels for liquids between successive fibrous layers. The filter may be washed in siti by spraying it with water even when in use. It is preferably tubular in shape with the gas flowing through it radially. @figs., 2000 words)
Separating In BP 2211
minerals 442
National
Research
describe a means of separating minerals. These are fed as a sluxzy and applied by a distributor ring to a hollow tapered body spinning on its, axis to generate a centrifugal force. A film of slung is held centrifugally at the external surface of the body. The denser, (that is, higher specific gr&ty) particles tend to move radially outward and downwardly in the boundary layer under gravity. Washing water displaces waste accidentally entrained with the higher specific gravity particles and these particles travel downwards and are collected. The water and light -weight par-tides overflow the top of the tapered body. (5J?.gs., 4500 ~YO?-ds).
Development
British patent Specifications
can be
123
of British
pool filter
In BP2210 803 Donco i%:~vtScsdescribe a filtering arrangement for swimming pools, With most filtration systems of this type, the pool is fitted with a peripheral overflow duct from which water is returned to the pool through a pump and filter. Water is passed through the filter in the reverse direction to clean the filter and the dirty water is conveyed to a drain. This arrangement normally requires about 10% of the pool water which must be replaced and reheated. In this invention, the filter is periodically cleaned by reversing the flow, but instead of using warm water from the pool for this purpose, the duct is repeatedly filled with cold water from another source and this is discharged after being used to backwash the filter. (2 figs., 2500 words)
Filtering
a water
sample
In BP2210 805 the Severn-lWnt Water Authority describes a method of indica-
ting the amount of solid matter suspended in a liquid sample using an automated approach. The sample is filtered using a filter CUD having an integral filter paper to which a suction is applied via a Buchner flask; the whole cup and filter paper unit being weighed before and after filtration. Automation of the process is facilitated because the cup is easier to handle mechanically than wet filter paper. This method also eliminates the need to rinse the vessel with pure water to ensure that all the solid matter reaches the filter paper. (2JIgs., 3500 words)
Separator conveyor
for use in installations
In BP221 I 438 G. Mouzon SA Air et Techniques describe a separator for use in conveyor installations where objects are conveyed over distances by pneumatic means. It consists of an inlet leading into a screen of part circular cross section from which the solids fall while air is forced through an outlet. A flap can be pivotally adjusted and the initial part of the screen is made of knitLed wire to present a rough surface to the air. The remainder of the screen is made of perforated metal. (4 figs., 2000 wo7Yi.s)
Exhaust
gas cordtioner
In BP 2210 809 Baker Hughes describe an apparatus for cooling and cleaning hot exhaust gas. It consists of an enclosure partialIy filled with liquid, and a conditioning device incorporaFlItration 8 Separation
March/April1991
Fine grain pigment particle separator
Patents
In Br2.W 1 114 sha& describes
ting a liquid induction section which ensures that the hot exhaust gas is mixed with liquid. This mixture flows through a compact section of the conditioning device for cooling and then goes to a separator where separation of gas and particulates from the liquid takes place by centrifugal action, Tine cleaned gas is then forced to strike an impingement device to remove any additional entrained liquid before being passed to atmosphere. The separated liquid is returned to the enclosure. (5JIgs., 7500 words)
Multi-stage
strainer
In BP2211 105 Edward B. Henzman describes a strainer for paint. It consists of a lidded vessel which supports a stack of fiat filter elements which have progressively decreasing pore sizes. The paint passes through the pores under the force of gravity. The vessel has an outlet pipe leading to a sprayer and may also incorporate an electric stirrer. Filter elements can be removed and may be stacked together or placed in a single housing with the lid. (6figs., 4000 words)
Water
filter
107 Newteam describe a liquid filter apparatus for use in a domestic water supply. It concists of a chamber with inlet and outlet openings in its side walls. The chamber is able to move behveen two positions: the first permits fluid to flow through the chamber, and the second position inhibits the fluid flow. A filter member in the chamber can be removed when tSe sleeve is in the second position and the end cap is removed. An advantage of the apparatus is that there is no need for a separate liquid cut - off valve. (2 sig., 2000 words) In BP2211
Filter for fan operates heating system 110 AWed E. Moore describes a filter for a fan-operated heating system consisting of a metal filter screen and a frame for fixing the screen to an existing grill. The metal filter screen is made of wire gauze or perforated metal. The fixing frame has comer and side pieces which are separate from another and which can be telescoped with respect to one another so that the fixing frame can be varied to suit the size of the grill frame. Comer and side pieces are preferably concave in cross section. (7$&s., 2500 words)
In BP2211
Rhodia AktSe-ngesoll-
a method of, and apparatus for, separating coarse grain and agglomerated pigment particles from a suspension containing the aforementioned substances and fine grain pigment particles. A suspension, of titanium dioxide powder and water, for example is introduced via an intake fitting leading into the bottom area of a tank Fixed plates are arranged in the tank parallel to each other and at an angle of 40” to 60”. The suspension is drawn off in the upper region of the tank via an overflow fitting and consists mainly of fine grain pigment particles. The suspension in the bottom region contains mainly coarse grain and agglomerated pigment particles and is drawn off via an outlet fitting. The fine graincd pigment particles are obtained for delustring purposes in the synthetic fibres industry. (Zfigs., 4000 words)
Filter for removing or mist aerosols. In BP2211
437 British
dust Nuclear
Fuels
describe a filter for removing liquid droplets or solid particle aerosols from a gas stream especially in plants where radioactive materials are processed. The filter is formed entirely of stainless steel or layers of a high voidage fibrous material with fibre diameters typically of 4 microns. There are drainage channels for liquids between successive fibrous layers. The filter may be washed in siti by spraying it with water even when in use. It is preferably tubular in shape with the gas flowing through it radially. @figs., 2000 words)
Separating In BP 2211
minerals 442
National
Research
describe a means of separating minerals. These are fed as a sluxzy and applied by a distributor ring to a hollow tapered body spinning on its, axis to generate a centrifugal force. A film of slung is held centrifugally at the external surface of the body. The denser, (that is, higher specific gr&ty) particles tend to move radially outward and downwardly in the boundary layer under gravity. Washing water displaces waste accidentally entrained with the higher specific gravity particles and these particles travel downwards and are collected. The water and light -weight par-tides overflow the top of the tapered body. (5J?.gs., 4500 ~YO?-ds).
Development
British patent Specifications
can be
123