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Filter housing
INVENTIONSINFILTRATIONANDSEPARATION Abstracts of British Patents Gas filter element In UK patent 223,%79 SMC describes a gas filter element. It comprises a stack of annular hollow filter units which are fusion bonded at inner peripheral rings by means of fusible joints. Each unit comprises inner and outer rings connected by a plate with circumferential ribs on each side. The ribs have rounded cross sections of 0.1 to 0.3mm radius and support filter membranes of F’TFE, which are fusion bonded to the inner and outer rings but not to the ribs. The element has a central outlet passage for filtrate formed by the rings and is placed in a disposable housing, the two parts of which are welded together at a position axially spaced from the element to avoid damaging it. (7jzgs.; 4 250 words)
Sound attenuating liquid-gas separator In UK patent 2291818 American standard describes a sound attenuating liquid-gas separation apparatus. It includes nested elements which are tuned to abate noise in general and at predetermined frequencies and is intended for use in a screw compressor assembly. The apparatus includes a helical flow path deEned internally by an outer shell. The shell is perforated at its downstream end to allow for the egress of separated oil. The apparatus includes a columnar open-ended cylindrical member inside the outer separator shell. A discharge conduit penetrates both the separator shell and the open end of the columnar cylindrical member within the shell to create the nesting effect that contributes to the oil separation process and abates noise. By selecting the dimensions and therefore tuning the nested members in accordance with the characteristics of a particular compressor assembly noise abatement at predetermined frequencies is accomplished. (S&s., 6000 words)
Water filter In UK patent 223200092 Natural Puma&r describes a filter for potable water. It consists of a central body and two removable end caps clamped together with combined seals and perforated discs between them. The end caps are bolted together with the body between them and they have flanges which are bolted to respective flanges retained by snap rings on the body. A single central rod may clamp the housing parts together. The central 66
parts of the discs are made from stainless steel or nylon mesh and enclose a bed of sand, charcoal or active carbon. The peripheral parts consist of integral plastics seals. The body and end caps are made from different plastics and have alternate inlets and outlets. The Elter can be connected in series and/or parallel. (4 &Js,; 3 500 words)
Two-stage filter element In UK patat 2232094 Pall describes an air filter element comprising a particulate filter sheet of glass fibres. The sheet is formed with both macro and micro-pleats, nesting in a downstream sorbent filter formed with triangular-section ridges on the upstream side and flat on the downstream side. The filter comprises active carbon, alumina, silica, sorbent clays, zeolites or molecular sieves, possibly impregnated with permanganate or sodium hydroxide. It is ln the form of a divided material supported between wire mesh and spun nylon web or of a bonded, self-supporting block, and it may have coloured bands on the downstream face to indicate depletion. (750 words)
Liquid filter In UK patent 2222902 Mark David Jackson describes a filter consisting of a housing enclosing a drum with apertures into which are screwed individual cylindrical filter elements through which liquid flows into the drum. To clean the elements the drum is rotated, bringing each element in line with one of a row of spring-loaded nozzles into which some Eltrate flows in the reverse direction to an outlet. The outlet comprises a cover plate which is removable to allow access to the nozzles without removing the drum. (SJQs.; 750 words)
Water filter In UK patent 2233246 John Shi-Y describes a filter for fitting to a domestic water tap. It consists of a dismountable housing the components of which are made from transparent plastics so that the filter media is visible. The media can be cotton wool, ion exchange resin and active carbon. An inlet sleeve is clamped between the housing components and is made of soft plastics. The sleeve has an upper loop for hooking over the tap and an internal ring for sealing purposes. The lower outlet member may be unscrewed if a narrow jet of water is not needed. (3 &a; 2 750)
Moving belt filter In UK patent 2232247 Simon-Hartley describes a moving belt filter for dewatering chemically conditioned sludges. It incorporates one or more rows of transversely spaced sludge deflectors on or close to the surface of the belt and suspended by leaf springs from an overhead beam which is Exed but pivots about an axis for servicing or replacement of parts. Each deflector diverges rear-wards and may also taper upwards or downwards. Preferably, several rows of deflectors are provided along the belt with the deflectors of each row being offset transversely with respect to those in the next row. The deflectors have base plates made from low-friction plastics and may be adjustable along the beam. (2 &a; 2 000 WOWiS)
Filter housing In UKpatent 2233574 Pall describes a filter housing. It comprises a Elter element enclosed by a housing consisting of a plastics tube with two plastics end caps joined together by welding and providing inlet and outlet openings respectively. As part of the manufacturing process, a flange is formed on the tube after heating and this flange and a further flange on the end cap are heated by contact with a hot plate and then pressed together. The end cap has a tubular portion with external seal rings and side apertures designed to cooperate with a fluid flow coupling. An external metal sheath may reinforce the housing. (1 jiig. 9000 words)
Filtering yeast slurry In UK patent 2233578 Edwards & Jones describes a method of filtering yeast slurry in a diaphragm Elter press. The resulting cake is squeezed by inflating the diaphragms, which are then deflated and the cake flushed from the press by circulating a fluid, which may be water or steam, through the chambers of the press. The cake removal may be assisted by re-inflating the diaphragms. The fluid used to remove the cake can be delivered initially through an inlet, which is designed to feed the original slimy or through the Elter cloths in the reverse direction. (3&s.; 2 500 words)
January/February 1992
Filtmtlon L Sopmmtlon
Sound attenuating liquid-gas separator In UK patent 2291818 American standard describes a sound attenuating liquid-gas separation apparatus. It includes nested elements which are tuned to abate noise in general and at predetermined frequencies and is intended for use in a screw compressor assembly. The apparatus includes a helical flow path deEned internally by an outer shell. The shell is perforated at its downstream end to allow for the egress of separated oil. The apparatus includes a columnar open-ended cylindrical member inside the outer separator shell. A discharge conduit penetrates both the separator shell and the open end of the columnar cylindrical member within the shell to create the nesting effect that contributes to the oil separation process and abates noise. By selecting the dimensions and therefore tuning the nested members in accordance with the characteristics of a particular compressor assembly noise abatement at predetermined frequencies is accomplished. (S&s., 6000 words)
Water filter In UK patent 223200092 Natural Puma&r describes a filter for potable water. It consists of a central body and two removable end caps clamped together with combined seals and perforated discs between them. The end caps are bolted together with the body between them and they have flanges which are bolted to respective flanges retained by snap rings on the body. A single central rod may clamp the housing parts together. The central 66
parts of the discs are made from stainless steel or nylon mesh and enclose a bed of sand, charcoal or active carbon. The peripheral parts consist of integral plastics seals. The body and end caps are made from different plastics and have alternate inlets and outlets. The Elter can be connected in series and/or parallel. (4 &Js,; 3 500 words)
Two-stage filter element In UK patat 2232094 Pall describes an air filter element comprising a particulate filter sheet of glass fibres. The sheet is formed with both macro and micro-pleats, nesting in a downstream sorbent filter formed with triangular-section ridges on the upstream side and flat on the downstream side. The filter comprises active carbon, alumina, silica, sorbent clays, zeolites or molecular sieves, possibly impregnated with permanganate or sodium hydroxide. It is ln the form of a divided material supported between wire mesh and spun nylon web or of a bonded, self-supporting block, and it may have coloured bands on the downstream face to indicate depletion. (750 words)
Liquid filter In UK patent 2222902 Mark David Jackson describes a filter consisting of a housing enclosing a drum with apertures into which are screwed individual cylindrical filter elements through which liquid flows into the drum. To clean the elements the drum is rotated, bringing each element in line with one of a row of spring-loaded nozzles into which some Eltrate flows in the reverse direction to an outlet. The outlet comprises a cover plate which is removable to allow access to the nozzles without removing the drum. (SJQs.; 750 words)
Water filter In UK patent 2233246 John Shi-Y describes a filter for fitting to a domestic water tap. It consists of a dismountable housing the components of which are made from transparent plastics so that the filter media is visible. The media can be cotton wool, ion exchange resin and active carbon. An inlet sleeve is clamped between the housing components and is made of soft plastics. The sleeve has an upper loop for hooking over the tap and an internal ring for sealing purposes. The lower outlet member may be unscrewed if a narrow jet of water is not needed. (3 &a; 2 750)
Moving belt filter In UK patent 2232247 Simon-Hartley describes a moving belt filter for dewatering chemically conditioned sludges. It incorporates one or more rows of transversely spaced sludge deflectors on or close to the surface of the belt and suspended by leaf springs from an overhead beam which is Exed but pivots about an axis for servicing or replacement of parts. Each deflector diverges rear-wards and may also taper upwards or downwards. Preferably, several rows of deflectors are provided along the belt with the deflectors of each row being offset transversely with respect to those in the next row. The deflectors have base plates made from low-friction plastics and may be adjustable along the beam. (2 &a; 2 000 WOWiS)
Filter housing In UKpatent 2233574 Pall describes a filter housing. It comprises a Elter element enclosed by a housing consisting of a plastics tube with two plastics end caps joined together by welding and providing inlet and outlet openings respectively. As part of the manufacturing process, a flange is formed on the tube after heating and this flange and a further flange on the end cap are heated by contact with a hot plate and then pressed together. The end cap has a tubular portion with external seal rings and side apertures designed to cooperate with a fluid flow coupling. An external metal sheath may reinforce the housing. (1 jiig. 9000 words)
Filtering yeast slurry In UK patent 2233578 Edwards & Jones describes a method of filtering yeast slurry in a diaphragm Elter press. The resulting cake is squeezed by inflating the diaphragms, which are then deflated and the cake flushed from the press by circulating a fluid, which may be water or steam, through the chambers of the press. The cake removal may be assisted by re-inflating the diaphragms. The fluid used to remove the cake can be delivered initially through an inlet, which is designed to feed the original slimy or through the Elter cloths in the reverse direction. (3&s.; 2 500 words)
January/February 1992
Filtmtlon L Sopmmtlon