FIELD OF THE INVENTION
The present invention is directed to a support grid assembly for use in a pressure vessel. More specifically, the present invention is directed to a support grid assembly having one or more screen panels that are operably, fluidly connected to a central flow manifold, whereby the screen panels are flexibly coupled to the central flow manifold so as to accommodate variances found in the fabrication of a vessel floor.
BACKGROUND
In some petrochemical and general industry applications, support grids having internal filter screens are needed in process pressure vessels for the purposes of filtering and supporting filter media. These support grids not only serve to prevent migration of the filter media from the vessel but can further serve to provide even fluid distribution patterns, thereby allowing effective use of all of filter media capacity. Furthermore, these support grids can be used to routinely backwash or regenerate the filter media. Conventional support grid assemblies include those available from the. Aqseptence, Inc. of New Brighton, Minn. and sold under the Johnson Screens brand as well as those disclosed in U.S. Pat. No. 6,790,357 and US Patent Publication 20140027369A1, each of which is hereby incorporated by reference.
While these support grids are valuable in improving the overall performance of process pressure vessels, it is a fundamental requirement that these support grids and their internal filter screens be robust enough to support the filter media above them, often comprising thousands of pounds of filter media. However, the methods used in fabricating large pressure vessels can lead to variations in a vessel floor, which otherwise supports these support grids. As such, it would be advantageous to have an adaptable support grid design that could accommodate variations in vessel floor construction such that the support grid and their internal screens properly support the filter media.
SUMMARY OF THE INVENTION
In accordance with embodiments disclosed herein, a support grid assembly for use in a pressure vessel includes one or more screen panel assemblies that are flexibly, fluidly coupled to a central fluid manifold. Generally, each screen panel slidably connects to a central fluid manifold and is connected with a flexible connection. In some embodiments, the flexible connection can comprise an adjustable split flange connection while in other embodiments, the flexible connection can make use of a flexible gasket member. Each screen panel assembly can include a male connecting end adapted for slidable insertion though a manifold sleeve opening on the central fluid manifold. In some embodiment, the connection of the each screen panel assembly and the central fluid manifold can be rotatably supported by a lower mounting arm that extends from a bottom portion of the screen panel assembly and that engages a support bracket extending from the central fluid manifold. In one representative embodiment, the lower mounting arm can comprise a mounting rod that can rotatably interface with the support bracket. Through the use of the flexible connection, each screen panel assembly can individually slide, rotate or otherwise shift relative to the central fluid manifold under loading of a filter media such that each screen panel assembly can fully engage a vessel floor regardless of surface and shape variations due to materials or fabrication techniques used when constructing the pressure vessel.
In one aspect, the present invention is directed to a support grid assembly, wherein individual screen panel assemblies are operably, flexibly coupled to a central fluid manifold such that variations in vessel floor construction are accommodated though sliding, rotation, and/or shifting of each individual screen panel assembly.
In another aspect, the present invention is directed to a method of providing flexibility to a support grid assembly such that variations in vessel floor construction can be accommodated without damaging the support grid assembly.
In yet another aspect, the present invention is directed to a pressure vessel having a support grid assembly that can flexibly accommodate variations in vessel floor construction.
The above summary is not intended to describe each illustrated embodiment or every implementation of the subject matter hereof. The figures and the detailed description that follow more particularly exemplify various embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
Subject matter hereof may be more completely understood in consideration of the following detailed description of various embodiments in connection with the accompanying figures, in which:
FIG. 1 is a schematic, section view of a pressure vessel including a support grid assembly according to the prior art.
FIG. 2 is a perspective, top view of an embodiment of a support grid assembly according to an embodiment of the present invention.
FIG. 3 is an exploded, perspective view of a central fluid manifold according to an embodiment of the present invention.
FIG. 4 is a section view a the support grid assembly of FIG. 2.
FIG. 5 is a detailed section view of the support grid assembly taken at Detail B of FIG. 4.
FIG. 6 is a perspective, end view of a screen panel assembly according to an embodiment of the present invention.
FIG. 7 is a top view of a split flange member according to an embodiment of the present invention.
FIG. 8a is a perspective, side view of a screen panel assembly inserted into a central fluid manifold with a disengaged split flange assembly according to an embodiment of the present invention.
FIG. 8b is a perspective, side view of a screen panel assembly inserted into a central fluid manifold and rotatably engaged with a vessel floor and having a disengaged split flange assembly according to an embodiment of the present invention.
FIG. 8c is a perspective, side view of a screen panel assembly inserted into a central fluid manifold and rotatably engaged with a vessel floor and having a split flange assembly engaged with the central fluid manifold according to an embodiment of the present invention.
FIG. 9 is a top view of an embodiment of a support grid assembly according to an embodiment of the present invention.
FIG. 10 is a perspective top view of the support grid assembly of FIG. 9.
FIG. 11 is a perspective top view of a screen panel assembly according to an embodiment of the present invention.
FIG. 12 is a side view of the screen panel assembly of FIG. 11.
FIG. 13 is a top view of the screen panel assembly of FIG. 11.
FIG. 14 is a perspective top view of a screen panel coupling flange according to an embodiment of the present invention.
FIG. 15 is a partially hidden side view of the support grid assembly of FIG. 9.
FIG. 16 is a perspective top view of a panel mounting body structure according to an embodiment of the present invention.
FIG. 17 is a detailed, perspective top view of a portion of the panel mounting body structure of FIG. 16.
FIG. 18 is a detailed, section view of a portion of the panel mounting body structure of FIG. 16.
FIG. 19 is a perspective top view of a mound ng cylinder according to an embodiment of the present invention.
FIG. 20 is a side view of the mounting cylinder of FIG. 19.
FIG. 21 is a detailed section view of a portion of the support grid assembly of FIG. 9.
FIG. 22 is a perspective top view of a plate member portion of a cover plate according to an embodiment of the present invention.
FIG. 23 is a perspective bottom view of the plate member portion of FIG. 22.
FIG. 24 is a side view of the plate member portion of FIG. 22.
While various embodiments are amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the claimed inventions to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the subject matter as defined by the claims.
DETAILED DESCRIPTION OF THE INVENTION
The following detailed description of embodiments refers to the accompanying drawings, which illustrate specific embodiments. Other embodiments having different structures and operation do not depart from the scope of the present disclosure.
Embodiments disclosed herein include a support grid assembly that can be used within tanks or vessels to support media beds through which fluids are directed. Such media beds can be used in a variety of processes, including but not limited to catalytic, molecular sieves, alumina drying, resin ion exchange, carbon filtering, etc. Various fluids, including but not limited to liquid, gas, oil, water, etc., can be processed through the vessel. The vessel can be oriented vertically, horizontally, or in other orientations and configurations known in the art. The vessel can generally comprise a body and head portions coupled at opposite ends of the body to form a sealed interior vessel volume. The support grid assembly can be disposed along and utilize the inner surface of the vessel head for structural support, as well as to maximize the interior vessel volume for use by additional media and other interior components.
The support grid assembly can include a plurality of panels, with each panel having a filming surface formed by one or more screens on the top, side, bottom, or other exposed surface of the panels, and a central fluid manifold coupled to the panels. The panels can be, in some embodiments, radially disposed about the manifold. The screens can support a media bed, and in certain modes such a down flow, fluid can flow through the media bed and the screens into the panels. Fluid can then flow into the manifold and out of the vessel. Fluid can also flow directly into the manifold through a screen or perforated plate portion that forms a top of the manifold. Alternatively, the direction of flow can be reversed, such as in certain modes of up flow, and flow into the manifold can be distributed to the panels, with flow then passing out of the panels, through the screens, and into the vessel. Flow through the assembly in either an up flow or down flow condition can be compressible (gas) or incompressible (liquid).
Certain terminology is used herein for convenience only and is not to be taken as a limitation on the embodiments described. For example, words such as “top”, “bottom”, “upper,” “lower,” “left,” “right,” “horizontal,” “vertical,” “upward,” and “downward” merely describe the configuration shown in the figures. Indeed, the referenced components can be oriented in any direction and the terminology, therefore, should be understood as encompassing such variations unless specified otherwise. Throughout this disclosure, where a process or method is shown or described, the method can be performed in any order or simultaneously, unless it is clear from the context that the method depends on certain actions being performed first.
With reference to FIG. 1, a representative pressure vessel of the prior art can comprise a cylindrical vessel including a support grid assembly 102. The cylindrical vessel 100 can define an upper portion 104 having an inlet 106 and a lower portion 108 with an outlet 110. As illustrated, support grid assembly 102 can be operably connected to the outlet 110 and reside and be supported by a vessel floor 112 of a lower vessel head 114. As presently described, inlet 106 and outlet 110 are described relative to arrows F indicated a direction of fluid flow in one conventional mode of operation. It will be understood that ins other modes of operation, for example, during a backwash operation, the direction of fluid flow can be reversed with outlet 110 acting as an inlet and inlet 106 functioning as an outlet. Generally, a filter media 116 resides on top of and is supported by the support grid assembly 102. Representative filter media can include sand, activated carbon, ion exchange resin, manganese greensand, catalytic materials and other conventional media used within pressure vessels.
Referring now to FIGS. 2, 3, 4 and 5, a representative support grid assembly 200 of the present invention can be utilized with cylindrical vessel 100 to replace the support grid assembly 102. Generally, support grid assembly 200 comprises a central fluid manifold 202 about which a plurality of screen panel assemblies 204 can be spaced and individually mounted. Each screen panel assembly 204 can comprise an upper surface 206, a pair of side surfaces 208a, 208b, an end surface 210 and a lower surface 212 that cooperatively define an internal fluid collection area 214. Generally, upper surface 206 can comprise one or more screen panels 216 that allow a fluid to pass through the screen panel 216 while preventing the passage of filter media 116. In a preferred embodiment, screen panel 216 can include a plurality of spaced filter wires supported on support rods. In one embodiment, screen panel 216 can include wire with a substantially triangular cross-section, for example, Vee-Wire® type screens (VEE-WIRE is a registered trademark of Aqseptence, Inc. of New Brighton, Minn.) or wedge wire type screens. In other representative embodiments, screen panel 216 can include plates having perforations, slots, and/or other filter-type openings formed therein. In various embodiments, the wires and/or plate openings can be oriented symmetrically, asymmetrically, horizontally, vertically, tangentially, and combinations thereof relative to a longitudinal axis defined by each screen panel assembly 204. In certain embodiments, the spacing and sizes of wires and/or plate openings defined on each screen panel 216 can vary along the surface of each screen panel 216. In some representative embodiments, each screen panel 216 can include one or more combinations of filter wires, plates, features with perforations and features that otherwise provide a plurality of filter-type openings allowing fluid to pass through said filter-type openings while preventing the passage of filter media. In addition to the presence of screen panel 216 on the upper surface 206, one or more screen panels 216 can also be found on one or more of the side surfaces 208a, 208b, end surface 210 and lower surface 212 to increase the filtering capacity of each screen panel assembly 204 or to achieve desired flow properties, for example, fluid velocities through the screen panel 216. Though not illustrated, it will be understood that each screen panel assembly 204 can comprise one or more flow directors or flow channels defined within the internal fluid collection area 214 capable of directing fluid flow to the central fluid manifold 202 in normal operation or out the screen panels 216 in a backwash mode. In some embodiments, the one or more flow directors can extend between the upper surface 206 and lower surface 212 to provide structural reinforcement to the screen panel assembly 204.
As best seen in FIGS. 2, 3, 4, 5, 8a, 8b and 8c, central fluid manifold 202 can comprise a mounting cylinder 220, a panel mounting body 222 and a cover plate 224. Mounting cylinder 220 generally comprises a cylindrical body 226 defining a flow passage 228 and terminating at an upwardly facing mounting flange 230. Mounting flange 230 can include a plurality of spaced apart mounting apertures 232. Central fluid manifold 202 can further include a plurality of spaced apart mounting brackets 234 coupled to the mounting cylinder 220 and mounting flange 230. Preferably, there are at least two mounting brackets 234 for each screen panel assembly 204. Each mounting bracket 234 includes a bracket body 236 extending radially from the cylindrical body 226 and includes an arcuate notch 238 at a radially distal surface 240 of the bracket body 236. Panel mounting body 222 can be cooperatively defined by a pair of substantially identical body structures 250a, 250b. Each body structure 250a, 250b can include a
lower wall 252, an upper wall 254, a pair of end walls 256a, 256b and a plurality of internal walls 258 that extend between the lower wall 252 and upper wall 254. Adjacent end walls 256a, 256b and internal walls 258 can define individual manifold sleeve openings 260. Generally, the number of manifold sleeve openings 260 will correspond directly to the number of screen panel assemblies 204 of the support grid assembly 200. As illustrated, the manifold sleeve openings 260 can define a substantially rectangular opening 262. Alternatively, the manifold sleeve openings 260 can have different opening shapes, for example, circular or oval-like shapes. In some instances, the shape of the manifold sleeve openings 260 can be adjusted through the use of a sleeve plate that can mount over each manifold sleeve opening 260, wherein the sleeve plate includes a sleeve aperture defining a desired shape. A plurality of sleeve apertures 263 can be spaced around each manifold sleeve openings 260. Lower wall 252 of each body structure 250a, 250b can include a plurality of lower apertures 264, wherein the number and spacing of lower apertures 264 correspond directly with the number and spacing of the mounting apertures 232. Upper wall 254 of each body structure 250a, 250b can include a plurality of spaced apart upper apertures 266. Cover plate 224 can comprise a pair of substantially identical plate members 270a, 270b. Each plate member 270a, 270b can comprise an arcuate plate body 272 that terminates in a cover flange 274. A plurality of cover apertures 276 can be spaced about a perimeter portion 278 of the arcuate plate body 272 wherein the spacing and number of cover apertures 276 corresponds directly with the upper apertures 266. Cover flange 274 can define an upper portion 280 and a lower portion 282, wherein the upper portion 280 has a width equal to the diameter of the cover plate 224 and wherein the lower portion 282 has a width that is less than the distance between the end walls 256a, 256b of the body structures 250a, 250b. Upper portion 280 can include a plurality of upper flange apertures 284 and lower portion 282 can include a plurality of lower flange apertures 286. Depending upon desired flow capacity and flow characteristics, portions of the cover plate 224, for example, the arcuate plate body 272 and/or portions of the mounting cylinder 220, for example, the cylindrical body 226 can be fabricated to include one or more screen panels 216 such that the central fluid manifold 202 can allow fluid to flow directly into or out of the central fluid manifold 202 without passing through the individual screen panel assemblies 204.
With reference to FIG. 6, each screen panel assembly 204 can include a male connecting end 300 defined by the upper surface 206, side surfaces 208a, 208b and lower surface 212. Male connecting end 300 can define a panel assembly opening 302 defining an opening perimeter shape 304. Proximate the panel assembly opening 302, the upper surface 206, side surfaces 208a, 208b and lower surface 212 can define an inward tapered surface 306. Upper surface 206 can include one or more handle members 308. Lower surface 212 can include a lower mounting arm 310 attached so as to project downward from the screen panel assembly 204. The lower mounting arm 310 can include a pair of arm brackets 312a, 312b that support a cylindrical mounting rod 314.
As seen in FIGS. 7, 8a, 8b and 8c, support grid assembly 200 can further comprise a split flange assembly 320 formed from a pair of substantially identical flange members 322a, 322b. Each flange member 322a, 322b can comprise a first leg 324 and a second leg 326 extending from a corner portion 328. First leg 324 can terminate at a first end 330 having an angled first aperture 332. Second leg 326 can terminate at a second end 334 having an angled second aperture 336. Corner portion 328 can include an angled corner aperture 338. Generally, split flange assembly 320 is formed by a positioning first end 330 of flange member 322a proximate the second end 334 of the flange member 322b with the second end 334 of flange member 322a proximate the first end 330 of flange member 322b. With the flange members 322a, 322b arranged in this manger, the split flange assembly 320 defines an inner opening 340 that substantially resembles the opening perimeter shape 304 of male connecting end 300 with the difference being that the inner opening 340 is slightly oversized when compared to the male connecting end 300. When flange members 322a, 322b are arranged to form the split flange assembly 320, the respective angled first apertures 332, angled second apertures 336 and angled corner apertures 338 are arranged to align with the sleeve apertures 263 around a corresponding manifold sleeve opening 260. The angled nature of the angled first apertures 332, angled second apertures 336 and angled central apertures 338 provide adjustability when mounting the flange members 322a, 322b.
Generally, support grid assembly 200 is assembled within the cylindrical vessel 100 by mounting the mounting cylinder 220 to the vessel floor 112 such that the flow passage 228 is in fluid connection with the outlet 110 and the upwardly facing mounting flange 230 is elevated above the vessel floor 112. Next, each of the body structure 250a, 250b are positioned on the upwardly facing mounting flange 230 such that the lower apertures 264 are in alignment with the mounting apertures 232. Appropriate fasteners, for example, threaded screws, nuts and bolts and the like can be inserted through the lower apertures 264 and mounting apertures 232 to couple the panel mounting body 222 to the mounting cylinder 220. Each of the screen panel assemblies 204 can then be attached to the panel mounting body 222 by inserting the male connecting end 300 though a corresponding manifold sleeve opening 260 such that the panel assembly opening 302 is located within the mounting cylinder 220 and in fluid communication with the flow passage 228. As each male connecting end 300 is inserted through the corresponding manifold sleeve opening 260, the cylindrical mounting rod 314 on each lower mounting arm 310 can be placed into rotatable engagement with the corresponding arcuate notches 238 on the two or more mounting brackets 234 that correspond with each screen panel assembly 204. Next the split flange assembly 320 can be positioned around the screen panel assembly 204 such that the angled first apertures 332, angled second apertures 336 and angled central apertures 338 of flange members 322a, 322b are aligned with the corresponding sleeve apertures 263. Using suitable fasteners such as threaded screws or nut and bolts, the split flange assembly 320 is coupled to the corresponding manifold sleeve opening 260, whereby the angled nature of the angled first apertures 332, angled second apertures 336 and angled central apertures 338 allow the split flange assembly 320 to be positioned snugly about the corresponding screen panel assembly 204. With the split flange assembly 320 attached, each screen panel assembly 204 can rotate about the cylindrical mounting rod 314 such that the lower surface 212 can come into contact with the vessel floor 112 to provide support to each screen panel assembly 204 as filter media 116 is supported by each upper surface 206. With the screen panel assemblies 204 fluidly coupled to the panel mounting body 222, the cover plate 224 can be placed over the body structures 250a, 250b to enclose the flow passage 228. Generally, the plate members 270a, 270b can be coupled together using suitable fasteners such as threaded screws, nuts and bolts and the like and by aligning the corresponding upper flange apertures 284 and the lower flange apertures 286. Next, the cover plate 224 is placed on the panel mounting body 222 such that the lower portion 282 extends between the body structures 250a, 250b and the cover apertures 276 are aligned with the upper apertures 266 of the panel mounting body 222. Suitable fasteners such as threaded screws, nuts and bolts and the like are used to couple the cover plate 224 to the panel mounting body 222.
With the support grid assembly 200 fully assembly and operably installed within the cylindrical vessel 100, fluid flow can be introduced in both conventional and backwash modes of operation as previously discussed. By avoiding a direct coupling of the screen panel assemblies 204 to the central fluid manifold 202, each screen panel assembly 204 is provided flexibility and support to avoid damage to the screen panel assembles 204 under loading from the filtration media 116. The slidable interaction of the male connecting end 300 with the manifold sleeve openings 260 and the adjustability of the split flange assembly 320 along with the rotatable interaction and support of the cylindrical mounting rod 314 and mounting brackets 234 allow the lower surface 212 of each screen panel assembly 204 to engage the vessel floor 112 even if the fabrication of the lower vessel head 114 is uneven or inconsistent across its profile. In this way, support grid assembly 200 can accommodate fabrication variations in the cylindrical vessel 100 while still providing support and advantageous flow characteristics.
Another representative embodiment of a support grid assembly 400 is illustrated in FIGS. 9 and 10. Generally, support grid assembly 400 can be used in the same applications as support grid assembly 200 but with a method of assembly that can be more suitable for certain installations. Support grid assembly 400 generally comprises a central fluid manifold 402 to which a plurality of screen panel assemblies 404 can be spaced and individually mounted. Central manifold 402 and screen panel assemblies 404 can have a similar appearance and be fabricated similarly to central manifold 202 and screen panel assemblies 204. Primary differences can comprise the way the screen panel assemblies 404 are coupled to the central manifold 402, the way the screen panel assemblies 404 interface with the vessel floor 112 and the overall assembly mode of support grid assembly 404.
Each screen panel assembly 404 as shown in FIGS. 11, 12, and 13 can generally comprise upper surface 206, side surfaces 208a, 208b, end surface 210 and lower surface 212 so as to cooperatively define the internal fluid collection area 214. Screen panel assembly 404 can again comprise one or more screen panels 216 that allow a fluid to pass through the screen panel 216 while preventing the passage of filter media 116. Screen panel 216 can be fabricated as described previously with a plurality of spaced filter wires supported on support rods, and in some preferred embodiments, include wire with a substantially triangular cross-section, for example, Vee-Wire® type screens or wedge wire type screens. As described previously, screen panel 216 can also include plates having perforations, slots, and/or other filter-type openings formed therein. In various embodiments, the wires and/or plate openings can be oriented symmetrically, asymmetrically, horizontally, vertically, tangentially, and combinations thereof relative to a longitudinal axis defined by each screen panel assembly 404. In certain embodiments, the spacing and sizes of wires and/or plate openings defined on each screen panel 216 can vary along the surface of each screen panel 216. In some representative embodiments, each screen panel 216 can include one or more combinations of filter wires, plates, features with perforations and features that otherwise provide a plurality of filter-type openings allowing fluid to pass through said filter-type openings while preventing the passage of filter media. In addition to the presence of screen panel 216 on the upper surface 206, one or more screen panels 216 can also be found on one or more of the side surfaces 208a, 208b, end surface 210 and lower surface 212 to increase the filtering capacity of each screen panel assembly 204 or to achieve desired flow properties, for example, fluid velocities through the screen panel 216. Though not illustrated, it will be understood that each screen panel assembly 204 can comprise one or more flow directors or flow channels defined within the internal fluid collection area 214 capable of directing fluid flow to the central fluid manifold 202 in normal operation or out the screen panels 216 in a backwash mode. In some embodiments, the one or more flow directors can extend between the upper surface 206 and lower surface 212 to provide structural reinforcement to the screen panel assembly 204.
In comparing individual screen panel assembly 404 to screen panel assembly 204, a primary difference between the embodiments is at a male connecting end 406. Generally, male connecting end 406 includes an elongated insertion sleeve 408 defining a panel assembly opening 410 having an opening perimeter shape 412. Panel assembly opening 410 is generally fluidly connected to the internal fluid collection area 214. Positioned over the elongated insertion sleeve 408 is a screen panel coupling flange 414 as shown in FIG. 14. Screen panel coupling flange 414 includes a flanged coupling surface 416 defining a coupling opening 418 that is shape and sized for slidable placement over the elongated insertion sleeve 408. The flanged coupling surface 416 includes a plurality of coupling flange apertures 419. The screen panel coupling flange 414 can further comprise a coupling body 420 that is attached to the flanged coupling surface 416 and sits flush with elongated insertion sleeve 408 when positioned through the coupling opening 418.
Central fluid manifold 402 as shown in FIGS. 15, 16, 17, 18, 19 and 20 can be substantially similar to central fluid manifold 402 with mounting cylinder 220, panel mounting body 222 and a cover plate 224. Depending upon the overall size and capacity of the cylindrical vessel 100, the plurality of spaced apart mounting apertures 232 can be external to the flow passage 228 as illustrated with respect to support grid assembly 200 or internally located within the flow passage 228 as illustrated in FIG. 19. The panel mounting body 222 of central fluid manifold 402 can be cooperatively defined by a pair of substantially identical body structures 432a, 432b. Body structures 432a, 432b can substantially resemble body structure 250a, 250b but with variation so as to accommodate connection to screen panel assembly 404. Generally, each body structure 432a, 432 includes a projecting flange mount 434 attached to a projecting body 436 that extends outward from individual manifold sleeve opening 260. Projecting flange mount 434 generally includes a projecting coupling surface 438 defining a projecting opening 440 and having a plurality of projecting flange apertures 442. Projecting coupling surface 438 is shaped and sized to match the flanged coupling surface 416 such that flange apertures 442 align with coupling flange apertures 419 and the projecting opening 440 matches the coupling opening 418.
Whereas support grid assembly 200 makes use of the interface between the cylindrical mounting rod 314 and the mounting brackets 234 to provide rotational support and adjustability between the screen panel assemblies 204 and the central fluid manifold 202, support grid assembly 400 utilizes a flexible gasket assembly 450 as illustrated in FIG. 21. Generally, flexible gasket assembly 450 comprises alternating layers of a compressible gasket member 452 and a rigid support member 454. Generally, compressible gasket member 452 and rigid support member 454 will be shaped and sized so as to resemble the size and shape of flanged coupling surface 416 and projecting coupling surface 438 including gasket apertures 456 in both the compressible gasket member 452 and rigid support member 454 that align with the coupling flange apertures 419 and flange apertures 442. Compressible gasket member 452 and rigid support member 454 each include complimentary openings such that the combined flexible gasket assembly 450 has a gasket assembly opening 458 that substantially resembles the coupling opening 418 and projecting opening 440, thereby allowing the flexible gasket assembly 450 to be positioned over the elongated insertion sleeve 408. A plurality of gasket fastener's 460 can be inserted though the coupling flange apertures 419, the gasket apertures 456 and the flange apertures 442 to sealably capture the compressible gasket member 452 and individually mount each screen panel assembly 404 to the central fluid manifold 402. The layered nature of the flexible gasket assembly 450 provides vertical and horizontal flexibility to the individual screen panel assemblies 404 such that they maintain fluid connection to the central fluid manifold 402 while allowing the lower surface 212 of each screen panel assembly 404 to individually engage and be supported by the vessel floor 112, thereby accommodating fabrication variations that can be present on the vessel floor 112.
In addition to an alternative mounting arrangement for the screen panel assemblies 404, support grid assembly 400 can further comprise an additional sealing arrangement between the central hub 402 and the vessel floor 112 as shown in FIG. 15 to reduce and/or eliminate the potential for any fluid bypass of the screen panel assemblies 404. Generally, the mounting flange 230 can comprise a bottom surface 470 that faces the vessel floor 112. Proximate a flange perimeter 472, the bottom surface 470 can define a downward extending lip 474. Downward extending lip 474 terminates in a lip edge 476. During installation of the central hub 402, the mounting cylinder 420 is inserted though the outlet 110. Prior to inserting the mounting cylinder 420, one or more compressible hub gaskets 478, for example, o-rings or other suitable sealing members and materials, can be positioned around the mounting cylinder 420 and into a sealing space 480 defined by the downward extending lip 424, the bottom surface 470 and the mounting cylinder 420. The mounting cylinder 420 is fully inserted when the downward extending lip 424 contacts the vessel floor 112, whereby the one more compressible gaskets 478 are compressed so as to seal and prevent bypass of any fluid along the vessel floor 112. As the cylindrical vessel 100 is loaded with filter media 116, the additional weight of the filter media 116 and fluid on the support grid assembly 400 can further assist in maintaining the seal at the vessel floor 112.
Support grid assembly 400 can further comprise one or more features to provide strength and/or improve flow performance within the central hub 402. As seen in FIGS. 22, 23 and 24, cover plate 224 can comprise plate members 270a, 270b that each include a lower plate surface 490 that resides inside the support grid assembly 400 when the cover plate 224 is coupled to the panel mounting body 422. Lower plate surface 490 can include a plurality of elongated members 492. Elongated members 492 can be arranged in parallel arrangement or alternatively, can be arranged radially as if projecting from a central axis that corresponds with a central axis of the cover plate 224. In some embodiments, elongated members 492 serve as reinforcement members that provide structural support to the cover plate 224. The use of elongate members 492 as reinforcement members can be especially important in embodiments in which the plate members 270a, 270b include an upper surface 491 formed of the same or similar screen panel 216 in order to increase overall filtering area and corresponding flow capacity of the support grid assembly 400. In some embodiments, the elongated members 492 can be formed to have a desired member height 494 such that elongated members 490 project downwardly into a panel mounting body opening 496 of the panel mounting body 422. By selecting a desired height, and for example, a radial arrangement that can correspond with the arrangement of the screen panel assemblies 404 as coupled to the panel mounting body 422, the elongated members 492 can act as flow modifiers to direct fluid flow into the mounting cylinder 420 and to avoid unfavorable flow conditions such as, for example, turbulent flow patterns, within the central fluid manifold 402.
Various embodiments of systems, devices, and methods have been described herein. These embodiments are given only by way of example and are not intended to limit the scope of the claimed inventions. It should be appreciated, moreover, that the various features of the embodiments that have been described may be combined in various ways to produce numerous additional embodiments. Moreover, while various materials, dimensions, shapes, configurations and locations, etc. have been described for use with disclosed embodiments, others besides those disclosed may be utilized without exceeding the scope of the claimed inventions.
Persons of ordinary skill in the relevant arts will recognize that the subject matter hereof may comprise fewer features than illustrated in any individual embodiment described above. The embodiments described herein are not meant to be an exhaustive presentation of the ways in which the various features of the subject matter hereof may be combined. Accordingly, the embodiments are not mutually exclusive combinations of features; rather, the various embodiments can comprise a combination of different individual features selected from different individual embodiments, as understood by persons of ordinary skill in the art. Moreover, elements described with respect to one embodiment can be implemented in other embodiments even when not described in such embodiments unless otherwise noted.
Patent Application
20210354056
