Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
  • B01D63/10—Spiral-wound membrane modules
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2313/00—Details relating to membrane modules or apparatus
  • B01D2313/02—Specific tightening or locking mechanisms

Definitions

• Core wound permeator or filter modules for re ⁇ erse osmosis permeators and for filtration de ⁇ ices (examples of which are shown in U,S. Patents No. 3,504,796; 3,568,843; and 4,301,013) ha ⁇ e been difficult to rerno ⁇ e from their containment housings.
• a seal typically surrounds and engages a module within its housing, and the seal resists against pulling the module axially out of its housing for replacement. Since the permeator or filter module occupies most of the space a ⁇ ailable within the containment housing, there is little room for fingers or tools to get a hold of the module for extracting it from its containment housing against the resis ⁇ tance of the seal that engages it.
• I ha ⁇ e disco ⁇ ered a simple and effecti ⁇ e solution for this problem.
• My retraction handle is so inexpensi ⁇ e that it can be assembled into the module when it is manufactured and can be discarded with the module when it has finished its work. My retraction handle thus eliminates the need for any special or separate tools for remo ⁇ ing modules from their housings.
• I incorporate the retraction handle into a plug permanently fixed within an end region of a hollow core of the module where the plug blocks fluid flow from that end of the core while the module is in use.
• I form the plug handle as a flexible handle ring surrounding and joined to a flange of 'the plug and lying flat against a retraction end of the module where the handle does not take up any additional space. The handle can be lifted away from the end of the module and pulled ax ⁇ ally of the core for with ⁇ drawing the module from its containment housing, after which the module is discarded, along with its handled plug.
• the plug is preferably molded of flexible resin material, and the force required to remove the plug from the core exceeds the force required for tearing the handle off the plug flange, which in turn exceeds the force required for with ⁇ drawing the module from its containment housing.
• the plug can also be made with a socket opening into the core to recei ⁇ e the end of an additional tube within the core. The junction region between the handle ring and the plug can extend radially outward into engage ent with the containment housing so that when the handle is pulled away from the module, it le ⁇ erages the loosening of t a module from its housing seal.
• the closure or plug blocking fluid flow from that end of the core is preferably recessed inward from the retraction end of the core, and sockets for the pull ring are preferably formed as holes through the core wall on a diameter of the core.
• the pull ring is shaped to lie flat against a retraction end of the module so as not to take up ⁇ aluable space, and the pull ring can be lifted from the module and pulled axially of the module for retracting it from its housing.
• Figure 1 is a partially schematic, side— ele ⁇ ational ⁇ iew of a permeator ha ⁇ ing a module supplied with a handled plug according to my in ⁇ ention;
• Figure 2 is an enlarged, fragmentary cross— sectional ⁇ iew of the plug end of the permeator of FIG. 1, showing operation of the retraction handle;
• Figure 3 is an ele ⁇ ational ⁇ iew of the plug end of the module of FIGS. 1 and 2;
• Figure 4 is an enlarged, fragmentary cross— sectional ⁇ iew, similar to the ⁇ iew of FIG. 2, showing an alternati ⁇ e pre erred embodiment of my handled plug, arranged to recei ⁇ e a tube within the core;
• Figure 5 is an end ele ⁇ ational ⁇ iew of the module of FIG. 4;
• Figures 6 and 7 are fragmentary and partially cross—sectioned ⁇ iews of another preferred embodiment of a module ha ⁇ ing a retraction handle le ⁇ eraged against the containment housing;
• Figure 8 is an end ele ⁇ ational ⁇ iew of the module of FIGS. 6 and 7;
• Figure 9 is a fragmentary side ele ⁇ ational ⁇ iew, similar to the ⁇ iew of FIG. 2, showing a ' preferred alternati ⁇ e of a retraction handle attached to a plugged end region of a module core;
• Figure 10 is a fragmentary end ele ⁇ ational ⁇ iew of the embodiment of FIG. 9.
• Permeator module 10 has a- fluid tight fit within seal 17 within contain ⁇ ment housing 11 where module 10 is co ⁇ ered by an end cap 12 and operated to separate a liquid supply 13 into a pure permeate 14- and a waste concentrate 15.
• a fluid tight fit for end cap 12 on housing 11 can be attained by screwing end cap 12 to housing 11, or using external clamps or fasteners.
• a membrane for permeator module 10 is wound on perforated core 20, as is generally known, and an output end 21 of core 20 is sealed in the permeate discharge line 18 by an 0— ing 22 that can be seated in a groo ⁇ e in the exterior surface of core 20 as illustrated, or seated in a groo ⁇ e in the interior surface of discharge line 18.
• the other end region 25 of core 20 is closed by a plug 30 that includes a retraction handle according to my in ⁇ e ⁇ tio ⁇ .
• re ⁇ erse osmosis permeators can be arranged within containment housings, fed with liquids, and supplied with output lines for pure permeate and concentrated brine.
• Modules suitable for a great many different arrangements can all be made with perforated core 20 on which an RO membrane is wound in a generally known way. Any of these core wound modules can benefit from my retraction handle to facilitate axial withdrawal of the module from its containment housing.
• Filtration modules can also use my in ⁇ ention, pro ⁇ ided they ha ⁇ e a core wound membrane or otherwise in ⁇ ol ⁇ e a filter element , assembled on a hollow core.
• Plug 30 has a body tightly and permanently fitted within an end region 25 of core 20 where plug body 31 blocks fluid outflow from core.20.
• Plug 30 differs from permeator and filter core plugs- in ha ⁇ ing a retraction handle 35 flexibly attached .to a flange 32 engaging the end 23 of core 20 and the end 16 of module 10.
• Plug 30 is preferably injection molded of a resilient resin material ha ⁇ ing the necessary strength, flexibility, and durability. I ha ⁇ e found polypropylene to be satisfactory, but other resins can be used, and may be more desirable in some circumstances.
• plug 30 is fitted tightly and securely within core end region 25. I prefer a pressed or hammered interference fit, but screw threads between plug body 31 and the inside of core 20 can be used.
• the fit between the core and the plug can also be strengthened by an adhesi ⁇ e formulated for use with specific materials forming the plug and the core. Other strengthening or bonding possibilities include fusion, spin welding, and sol ⁇ ent bonding.
• the desired result is that the force required to pull plug body 31 out of core 20 exceeds the force required to tear handle 35 away from plug flange 32, which in turn exceeds the force required to withdraw module 10 axially from seal 17 within containment housing 11. Then before handle 35 tears away from plug flange 32 and before plug body 31 pulls out of core 20, module 10 will loosen from seal 17 and mo ⁇ e axially out of containment housing 11.
• An alternati ⁇ e plug 30a shown in FIG. 4, has a socket 36 opening into a somewhat larger core 20 where socket 36 recei ⁇ es the end of a tube 37 " .
• a recess 34 between core 20 and socket 36 sa ⁇ es material and allows some deformation to accommodate fluid-tight fits with both core 20 and tube 37.
• a passageway 38 allows fluid to flow through head 39 of plug 30a between tube 37 in socket 36 and the region within end cap 12 (FIG. 1) . This can allow supply fluid to enter the end 16 of module 10 ⁇ ia tube 37 and plug passageway 38, or it can allow waste fluid from module end 16 to pass through plug passageway 38 and exit ⁇ ia tube 37.
• plug 30a is similar to plug 30 (FIG. 2) and includes handle 35 flexibly attached to plug flange 32 at a radially extending region 33.
• FIGS. 6 and 7 Another alternati ⁇ e plug 40 with a le ⁇ eraged handle 4-5 is shown in FIGS. 6 and 7.
• Plug 40 is similar to plugs 30 and 30a in ha ⁇ ing a body 41 that fits tightly within an end region 25 of core 20 and differs in ha ⁇ ing a fulcrum 46 extending radially beyond the junction region 43 between plug flange 42 and handle 45 so that fulcrum 46 can engage contain— ment housing 11.
• handle 45 is lifted away from module end 16 as shown in FIG. 7, fulcrum 46 braces against containment housing 11 while handle 45 pulls outward on junction region 43, exerting a le ⁇ eraged axial pull on plug flange 42 and body 41.
• This le ⁇ eraged axial pull on plug 40 helps loosen module 10 from the grip of seal 17 to initiate an axial withdrawal, the remainder of which proceeds with a smaller force requirement supplied by an axial pull on handle 45 in the same way that modules 10 are retracted by plug handles 35 (FIGS. 2 and 4).
• Handles 35 and 45 when not in use, lie flat against retraction ends 16 of modules 10 so that handles 35 and 45 do ' not take up ⁇ aluable space under end cap 12 within containment housing 11. This pre ⁇ ents any sacrifice of the effecti ⁇ e working area of module 10 to accommodate a retraction handle.
• Handles 35 and 45 can be formed integrally with plugs 30, 30a and 40 by injection molding, which I prefer because it makes the handles so inexpensi ⁇ e that they can be discarded along with the used modules 10. Handles for core plugs can also be made separately of metal or resin materials and mechani ⁇ cally attached to plug bodies or flanges.
• FIGS. 9 and 10 Another preferred embodiment of a retraction handle 50 is shown in FIGS. 9 and 10.
• Perforated core 20a has a retraction end region 60 that is closed or plugged by a barrier 61, which can be integrally formed with core 20a as illustrated, or can be a separate plug pushed into retraction end 60 of core 20a. Either way, retraction end 60 is preferably recessed adjacent plug or barrier 61 to accommodate retraction handle 50.
• This is preferably formed as a wire or resin pull ring 52 ha ⁇ ing a bend 51 arranged so that pull ring 52 normally lies flat against retraction end 16 of module 10.
• Ends 53 of handle 50 are preferably seated in sockets 63 formed in the wall of core 20a.
• Handle ends 53 preferably pi ⁇ ot within sockets 63, which are preferably formed as holes through the wall of core 20a on a diameter of core 20a.
• Handle 50 like handles 35 and 45, can be lifted away from retraction end 16 of module 10 and pulled axially of core 20a for withdrawing module 10 from housing 11.
• Handle 50 has both a pi ⁇ otal and strong connection with core 20a to which handle 15 can be easily attached by springing legs 53 inward and seating them within sockets 63 in the plugged end 60 of core 20a.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Separation Using Semi-Permeable Membranes (AREA)

Applications Claiming Priority (2)

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• 1987
  • 1987-08-28 WO PCT/US1987/002111 patent/WO1988001530A1/en not_active Application Discontinuation
  • 1987-08-28 EP EP87905988A patent/EP0279847A1/en not_active Withdrawn
  • 1987-08-28 JP JP1988600009U patent/JPS63500003U/ja active Pending

Non-Patent Citations (1)

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