Filter seal assembly and system

Abstract

To provide a filtration system capable of reducing the possibility of movement of a filter assembly from a tube sheet and improving structural rigidity between an end cap and the tube sheet.SOLUTION: A filtration system includes: a tube sheet; a filter medium 110; and an end cap 130 coupled to a first end of the filter medium. The end cap 130 is coupled to the first end 112 of the filter medium 110, and defines an opening in fluid communication with a central medium opening, an inner surface abutting on and surrounding the end cap opening and a peripheral sealing surface 140 about the end cap. A first portion 142 of the peripheral sealing surface 140 projects inwardly towards the end cap opening, and a second portion 144 of the peripheral sealing surface 140 projects outwardly from the end cap opening. The first portion 142 and the second portion 144 are in axial alignment, and the peripheral sealing surface 140 forms an oblong loop in a first cross-section orthogonal to the axial direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This application claims the benefit of U.S. Provisional Patent Application No. 62 / 803,097, filed Feb. 8, 2019, which is hereby incorporated by reference in its entirety.

[0002] The present disclosure generally relates to a filter system. More particularly, the present disclosure relates to a filter seal assembly.

Summary of the Invention

Means for Solving the Problems

[0003] The technology disclosed herein relates, in part, to a filter assembly. The filter media is disposed around a central media opening, and the filter media has a first end and a second end. The central media opening extends axially from the first end toward the second end. An end cap is coupled to the first end of the filter media. The end cap defines an opening that is in fluid communication with the central media opening, an inner surface that abuts and surrounds the end cap opening, and a peripheral seal surface around the end cap. A first portion of the peripheral seal surface projects inwardly toward the end cap opening, and a second portion of the peripheral seal surface projects outwardly from the end cap opening. The first and second portions are axially aligned, and the peripheral seal surface forms an oval loop in a first cross-section orthogonal to the axial direction.

[0004] In some such embodiments, the end cap opening is elongated in a first cross-section. Alternatively, the central media opening is elongated in a second cross-section perpendicular to the axial direction. Alternatively, the assembly has an expansion insert defining an insert opening on its outer surface, the outer surface of the expansion insert configured to define a compression fit with the inner surface of the end cap. Alternatively, the expansion insert defines a tertiary flow path that communicates fluidly with the central media opening. Alternatively, the outer surface of the expansion insert defines a recess extending inward toward the insert opening and a protrusion extending outward from the insert opening, the recess and protrusion being axially aligned, and the inner surface defining a fitting function. Alternatively, the first cross-section of the circumferential sealing surface defines a first end, a second end, a first elongated side, and a second elongated side, the first and second portions defined on the first elongated side.

[0005] Alternatively, the first portion of the circumferential sealing surface abuts against the second portion of the circumferential sealing surface. Alternatively, the end cap defines the plurality of first portions of the circumferential sealing surface and the plurality of second portions of the circumferential sealing surface. Alternatively, the first and second portions alternate. Alternatively, the filter medium is a bag configuration. Alternatively, the filter medium is a pleated configuration.

[0006] Some embodiments of this technology relate to a tube sheet. A substantially planar sheet of material has a length and width, defining a series of filter openings along the length and width of the sheet of material. Each of the filter openings in the series penetrates the sheet of material axially and has an elongated elliptical shape perpendicular to the axial direction. The sheet of material defines convex portions extending into each of the filter openings and concave portions extending from each of the filter openings, and the convex portions and concave portions are axially aligned.

[0007] In some such embodiments, each filter opening defines a plurality of axially aligned protrusions and recesses, the protrusions alternating with the recesses around each portion of the filter opening. Alternatively, the plurality of protrusions and recesses form a corrugated shape extending along a curve. Alternatively, the sheet of material is a sheet of metal. Alternatively, the shape of each filter opening defines a first elongated side, a second elongated side, a first end, and a second end, the protrusions extending from the filter opening at the first elongated side. Alternatively, the recesses extending within each filter opening at the second elongated side. Alternatively, the shape of each filter opening is symmetrical. Alternatively, the first filter opening defined within the tube sheet has a first longitudinal axis, the second filter opening defined within the tube sheet has a second longitudinal axis, and the first and second longitudinal axes are open to 10 to 90 degrees apart.

[0008] Some embodiments described herein relate to filtration systems. A tube sheet has a substantially planar sheet of material having length and width and defining a filter opening. The filter medium has a first end and a second end and defines a central medium opening extending axially from the first end toward the second end. An end cap is coupled to the first end of the filter medium. The end cap defines an end cap opening that is in fluid communication with the central medium opening, an inner surface that abuts against and surrounds the end cap opening, and a circumferential sealing surface around the end cap configured to fit with the tube sheet around the filter opening. A first portion of the circumferential sealing surface projects inward toward the end cap opening, and a second portion of the circumferential sealing surface projects outward from the end cap opening, and the first and second portions are axially aligned. The filter opening defines a corresponding outward projection configured to receive the second portion of the circumferential sealing surface and a corresponding inward projection configured to receive the first portion of the circumferential sealing surface.

[0009] In some such embodiments, the filtration system has an outer surface and an expansion insert defining an insert opening that communicates with a central medium opening, the outer surface of the expansion insert being configured to define a compression fit with the inner surface of an end cap. The outer surface of the expansion insert defines a recess extending inward toward the insert opening and a protrusion extending outward from the insert opening, the recess and protrusion being axially aligned, and the inner surface defining a fitting function.

[0010] Alternatively, the circumferential sealing surface defines a first end, a second end, a first elongated side, and a second elongated side, with the first and second portions defined on the first elongated side. Alternatively, the first portion of the circumferential sealing surface abuts against the second portion of the circumferential sealing surface. Alternatively, the end cap defines a plurality of first portions of the circumferential sealing surface and a plurality of second portions of the circumferential sealing surface. Alternatively, the first and second portions are arranged alternately.

[0011] Alternatively, the circumferential sealing surface forms an elongated elliptical loop in a first cross-section perpendicular to the axial direction. Alternatively, the end cap opening is elongated elliptical in the first cross-section. Alternatively, the central media opening is elongated elliptical in a second cross-section perpendicular to the axial direction. Alternatively, the expansion insert defines a tertiary flow path that communicates with the central media opening. Alternatively, the filter opening penetrates the tube sheet axially, and the filter opening is elongated elliptical in a second cross-section perpendicular to the axial direction.

[0012] Alternatively, the tube sheet defines protrusions extending within the filter openings and recesses extending from the filter openings, with the protrusions and recesses being axially aligned. Alternatively, the tube sheet defines a plurality of axially aligned protrusions and recesses, with the protrusions alternating with the recesses around each filter opening. Alternatively, the plurality of protrusions and recesses form a corrugated shape extending along a curve. Alternatively, the sheet of material defines a series of filter openings along the length and width of the sheet of material. Alternatively, each of the filter openings in the series has an elongated elliptical shape perpendicular to the axial direction. Alternatively, the shape of each filter opening is symmetrical.

[0013] In some embodiments, the technology relates to a filter assembly. A filter medium is arranged around a central medium opening. The filter medium has a first end and a second end, and the central medium opening extends axially from the first end to the second end. An end cap is coupled to the first end of the filter medium. The end cap defines an end cap opening that is in fluid communication with the central medium opening, an inner surface that abuts against and surrounds the end cap opening, and a circumferential sealing surface around the end cap. An expansion insert defines an outer surface and an insert opening, and the outer surface of the expansion insert is configured to define a compression fit with the inner surface of the end cap. The outer surface of the expansion insert defines a recess extending inward toward the insert opening and a protrusion extending outward from the insert opening, the recess and protrusion being axially aligned, and the inner surface defining a fitting function.

[0014] In some such embodiments, a first portion of the circumferential sealing surface protrudes inward toward the end cap opening, a second portion of the circumferential sealing surface protrudes outward toward the end cap opening, and the first and second portions are axially aligned. Alternatively, the first portion of the circumferential sealing surface abuts against the second portion of the circumferential sealing surface. Alternatively, the end cap defines a plurality of first portions of the circumferential sealing surface and a plurality of second portions of the circumferential sealing surface. Alternatively, the circumferential sealing surface forms an elongated elliptical loop in a first cross-section perpendicular to the axial direction. Alternatively, the expansion insert defines a tertiary flow path that communicates fluid with the central medium opening. Alternatively, the first cross-section of the circumferential sealing surface defines a first end, a second end, a first elongated side, and a second elongated side, with the first and second portions defined on the first elongated side.

[0015] The above summary is not intended to describe every or all embodiment. Rather, the embodiments for illustrative purposes will be better understood by referring to the following detailed description of exemplary embodiments and claims, taking into consideration the accompanying drawings.

[0016] This technology will be more fully understood and correctly recognized by considering the following detailed descriptions of various embodiments in relation to the attached drawings. [Brief explanation of the drawing]

[0017] [Figure 1] This is a perspective view of an exemplary filter assembly consistent with several embodiments of the current technology. [Figure 2] This is a second perspective view of an exemplary filter assembly consistent with Figure 1. [Figure 3] This is a detailed view of Figure 1. [Figure 4] This is a detailed view of Figure 2. [Figure 5] This is a cross-sectional view of Figure 3. [Figure 6] This is a cross-sectional view of another exemplary embodiment. [Figure 7]Cross-sectional view of yet another exemplary embodiment. [Figure 8] Cross-sectional view of an exemplary embodiment corresponding to FIG. 3. [Figure 9] Alternative cross-sectional view of another exemplary embodiment corresponding to FIG. 3. [Figure 10] Front view of a portion of an exemplary system. [Figure 11] Exploded perspective view of a portion of an exemplary system corresponding to some embodiments. [Figure 12] Perspective exploded view of another portion of an exemplary system corresponding to some embodiments. [Figure 13] Side view, an exemplary system corresponding to FIG. 12.

Best Mode for Carrying Out the Invention

[0018] The figures are shown mainly for clarity and, as a result, are not necessarily drawn to scale. Further, various structural / component elements, including but not limited to fasteners, electrical components (wiring, cables, etc.), may be shown schematically, or may be removed from part or all of the figure to better illustrate the aspects of the embodiments shown, or the inclusion of such structural / component elements is not necessary for understanding the various exemplary embodiments described herein. However, the absence of description / depiction of such structural / component elements in a particular figure should not be construed in any way as limiting the scope of the various embodiments.

[0019] FIG. 1 is a perspective view of an exemplary filter assembly 100 corresponding to some embodiments of the current technology, and FIG. 2 shows a second perspective view of the exemplary filter assembly 100. The filter assembly 100 has a filter medium 110 having a first end 112 and a second end 114. An end cap 130 is coupled to the first end 112 of the filter medium. The end cap 130 defines an end cap opening 136 that communicates with a central medium opening 116.

[0020] The filter medium 110 is generally configured to filter a fluid, such as a gaseous fluid, for example. However, in some other embodiments, the filter medium 110 is configured to filter a liquid. The filter medium 110 is generally disposed around the central medium opening 116. The filter medium 110 and the central medium opening 116 extend in the axial direction a from the first end 112 of the filter medium 110 towards the second end 114 of the filter medium 110.

[0021] The filter medium 110 can be made from various types of materials and combinations of materials. In some embodiments, the filter medium 110 is in a pleated configuration (described in more detail below with reference to FIG. 8). In some embodiments, the filter medium 110 is in a bag configuration that defines an open end at the first end 112, a closed end towards the second end 114, and the central medium opening 116, and is one or more layers of the filter medium. Other types of filter media 110 can also be used.

[0022] The closure 120 can be defined towards the second end 114 of the filter medium 110. The closure 120 is generally configured to block the central medium opening 116 at the second end 114 of the filter medium 110. In particular, the closure 120 aids in defining a fluid flow path that extends through the filter medium 110 between the outside of the filter assembly 100 and the central medium opening 116. In some embodiments, such as embodiments where the filter medium 110 is in a pleated configuration, the closure 120 can be a second end cap coupled to the second end 114 of the filter medium 110. In other embodiments, the closure 120 can be part of the filter medium 110 itself, for example, when the filter medium 110 is in a bag configuration.

[0023] In some embodiments, the central medium opening 116 defines the downstream side of the filter assembly 100, and the outer surface 118 of the filter medium 110 defines the upstream side of the filter assembly 100. In some other embodiments, the central medium opening 116 defines the upstream side of the filter assembly 100, and the outer surface 118 of the filter medium 110 defines the downstream side of the filter assembly 100.

[0024] The filter assembly 100 is generally configured to be fitted into a filtration system. In particular, the end cap 130 is generally configured to form a seal between the system components and the filter medium 110 so that the filtrate is separated from the unfiltered fluid, which will be described in more detail below. The end cap 130 defines a filter medium receptacle 134 configured to receive the first end 112 of the filter medium 110. The end cap opening 136 is in fluid communication with the central medium opening 116 so that the fluid can pass through. The end cap 130 defines an inner surface 138 that abuts against and surrounds the end cap opening 136, which can be seen in particular in Figure 4, a detailed view of Figure 2.

[0025] The end cap 130 also defines a circumferential sealing surface 140 around the end cap 130, which can be seen in particular in Figure 4, a detail view of Figure 1. The circumferential sealing surface 140 is configured to be sealably received by components of the filtration system, such as a tube sheet opening, which will be described in more detail below. The circumferential sealing surface 140 has an axial depth d. The depth d can be dimensioned to accommodate system components configured to form a seal with the circumferential sealing surface 140. In some embodiments, the depth d can be 3 mm to 30 mm, 4 mm to 15 mm, or 5 mm to 10 mm. In one exemplary embodiment, the depth d is approximately 6 mm. The circumferential sealing surface 140 has a length that extends around the end cap opening 136. A first portion 142 of the circumferential sealing surface 140 protrudes inward toward the end cap opening 136, thus forming a recess. The second portion 144 of the circumferential sealing surface 140 protrudes outward from the end cap opening 136, thus forming a convex portion. The first portion 142 and the second portion 144 are axially aligned.

[0026] The end cap edge 132 extends outward from the circumferential sealing surface 140. In some embodiments, the end cap edge 132 abuts against the circumferential sealing surface 140 over the length of the circumferential sealing surface 140 around the end cap 130. In some embodiments, the end cap edge 132 may also be configured to form a seal with a system component. For example, the end cap edge 132 may define a seal support surface 133 that abuts against the circumferential sealing surface 140. In some embodiments, the seal support surface 133 is planar. The seal support surface 133 can be perpendicular to the circumferential sealing surface 140.

[0027] The end cap 130 can be made from a variety of different types of materials and combinations of materials. In some embodiments, the end cap 130 is made from urethane. In some embodiments, the end cap 130 is made from cast aluminum, and the gasket material is disposed over one or more surfaces, for example, around the circumferential sealing surface 140 and at least a portion of the sealing support surface 133 around the circumferential sealing surface 140. In some embodiments, the end cap 130 is made at least partially from a material having a durometer of about 30 Shore A to 70 Shore A.

[0028] Figure 5 shows a cross-sectional view of the end cap 130 in a plane perpendicular to the axial direction a. In this figure, the circumferential sealing surface 140 is a line that forms a loop around the end cap opening 136. The loop formed by the circumferential sealing surface 140 is an elongated ellipse in the direction parallel to the longitudinal axis L. Similarly, the end cap opening 136 is also an elongated ellipse in the longitudinal direction L.

[0029] The shapes of the first portion 142 and the second portion 144 of the circumferential sealing surface 140 can be seen in detail in the present figure. Furthermore, it can be seen that the end cap 130 defines a plurality of first portions 142 and a plurality of second portions 144 of the circumferential sealing surface 140. At least one first portion 142 abuts against at least one second portion 144 of the circumferential sealing surface 140. In fact, the plurality of first portions 142 alternate with the plurality of second portions 144. The plurality of first portions 142 and second portions 144 successively form a wave extending along the curve c.

[0030] The cross-section of the circumferential sealing surface 140 defines a first end 143, a second end 145, a first elongated side portion 147, and a second elongated side portion 149. The first portion 142 and the second portion 144 are defined on the first elongated side portion 147. The first portion 142 and the second portion 144 are also defined on the second elongated side portion 149.

[0031] In this embodiment, the circumferential sealing surface 140 is symmetrical with respect to the longitudinal axis L, but in some embodiments, the circumferential sealing surface 140 is not symmetrical. Furthermore, each of the first portion 142 and the second portion 144 of the circumferential sealing surface 140 has a repeating regular contour shape, but in some embodiments, the contour shapes of the first portion 142 and the second portion 144 are not regular and / or repeating. Furthermore, at least one first portion 142 may have a different contour shape from another first portion 142. Similarly, at least one second portion 144 may have a different contour shape from another second portion 144.

[0032] The circumferential sealing surface 140 may have a structure that incorporates convex and concave portions having a shape, size, and proportions consistent with the sealing surface disclosed in PCT / U.S. Patent Application Publication No. 2018 / 045819, filed on August 8, 2018, titled "Filter Cartridges: Air Cleaner Assemblies; Housings; Features; Components; and, Methods," which is incorporated herein by reference.

[0033] The total length of the circumferential sealing surface 140 can be called P1, and the total length of the portion of the circumferential sealing surface 140 defined by the convex and concave portions can be called P2, where "total length" in this context refers to the sealing surface distance including the contour. In the current figure, P2 is, for example, the length of the circumferential sealing surface 140 between the endpoints 10c and 10d of the second section defining the convex portion abutting the concave portion, plus the length of the circumferential sealing surface 140 between the endpoints 10a and 10b of the first section defining the convex portion abutting the concave portion. The ratio of P1 to P2 is generally greater than 1.0, but in some embodiments, the ratio of P1 to P2 is approximately equal to 1.0. In some embodiments, the ratio of P1 to P2 is between 1.1 and 3.0. In some embodiments, the ratio of P1 to P2 is between 1.2 and 1.7. In one example, the ratio of P1 to P2 is approximately equal to 1.5.

[0034] The dimensions of the protrusions and recesses can be characterized in various ways, for example, by the depth D1 between a particular protrusion and an adjacent recess. Typically, the protrusion / recess depth D1 is 70 mm or less, often 50 mm or less, and usually 30 mm or less. Typically, the protrusion / recess depth D1 is at least 5 mm, at least 10 mm, and sometimes at least 15 mm. In some embodiments, the protrusion / recess depth D1 can be 5 to 15 mm, for example, 6 mm or 9 mm. Alternative configurations are possible.

[0035] In some embodiments, the recess of the first portion 142 defines a radius R1. The radius R1 of the first portion can be 4 mm to 40 mm. In some embodiments, the radius R1 of the first portion can be about 4 mm, 6 mm, 12 mm, 16 mm, 24 mm, 33 mm, or 39 mm. In some embodiments, the protrusion of the second portion 144 defines a radius R2. The radius R2 of the second portion can be 4 mm to 40 mm. In some embodiments, the radius R2 of the second portion can be about 4 mm, 5 mm, 6 mm, 11 mm, 16 mm, 17 mm, 19 mm, or 26 mm. Furthermore, the distance between adjacent first portions or adjacent second portions, for example, distance dd in Figure 5, is generally greater than 10 mm. In some embodiments, distance dd can be 15 to 70 mm, 30 to 50 mm, or 35 to 45 mm. In one example, distance dd can be about 42 mm. Furthermore, if the circumferential sealing surface 140 has multiple first and second portions, each first portion (or second portion) does not necessarily have the same depth, radius, and / or shape, and the distance between adjacent first portions and adjacent second portions can be varied.

[0036] Figure 6 shows a cross-sectional view of the filter assembly with another exemplary end cap 200. The filter assembly can be matched with other filter assemblies discussed herein, unless incompatible. Similar to the cross-section shown in Figure 5, here the cross-section is a plane perpendicular to the axial direction of the filter assembly. The end cap 200 defines an end cap opening 230 and a circumferential sealing surface 220 around the end cap 200. The circumferential sealing surface 220 also extends around the end cap opening 230. The end cap 200 also has an end cap edge 210 that extends outward from the circumferential sealing surface 220.

[0037] The circumferential sealing surface 220 has a first projection 222 and a second projection 224 extending outward from the end cap 200 and the end cap opening 230. In this example, the shape of the circumferential sealing surface 220 is not symmetrical (unlike the example shown in Figure 5). The first recess 226 and the second recess 228 abut against each side of the first projection 222 due to the projection shape of the first projection 222. The ratio of the total length of the circumferential sealing surface 220 to the total length of the circumferential sealing surface 220 defined by the projections and recesses can be the same as the ratio described above with respect to Figure 5.

[0038] The protrusion / recess depth D2 can be defined between the first protrusion 222 and an adjacent recess (such as the first recess 226). The protrusion / recess depth can be the same as the depth described above with respect to Figure 5. The first protrusion 222 can define a radius R3. The radius R3 of the first protrusion can be the same as the radius R1 of the first part described above with respect to Figure 5. The second protrusion 224 can define a radius similar to or different from the radius R3 of the first protrusion. The second recess 228 can define a radius R4. The radius R4 of the second recess 228 can be the same as the radius R2 of the second part described above with respect to Figure 5. The first recess 226 can define a radius similar to or different from the second recess 228.

[0039] Figure 7 shows a cross-sectional view of the filter assembly with another exemplary end cap 300. The filter assembly can be matched with other filter assemblies discussed herein, unless incompatible. Similar to the cross-section shown in Figure 5, here the cross-section is a plane perpendicular to the axial direction of the filter assembly. The end cap 300 defines an end cap opening 330 and a circumferential sealing surface 320 around the end cap 300. The circumferential sealing surface 320 also extends around the end cap opening 330. The end cap 300 also has an end cap edge 310 that extends outward from the circumferential sealing surface 320.

[0040] The circumferential sealing surface 320 has a first projection 322 and a second projection 324 extending outward from the end cap 300. The first projection 322 can be characterized by a first recess 326 that it abuts against, defined by the circumferential sealing surface 320. The second projection 324 is formed similarly. The circumferential sealing surface 320 also has a third projection 328 and a fourth projection 340 that abut against the second recess 342.

[0041] The ratio of the total length of the circumferential sealing surface 320 to the total length of the circumferential sealing surface 320 defined by the convex and concave portions can be the same as the ratio described above with respect to Figure 5. The convex / concave depth D3 can be defined between the first convex portion 322 and the first concave portion 326 (which is an adjacent concave portion). The convex / concave depth D3 can be the same as the depth described above with respect to Figure 5. The first convex portion 322 can define a radius R5. The radius R5 of the first convex portion can be the same as the radius R1 of the first portion described above with respect to Figure 5. The second convex portion 324 can define a radius similar to or different from the radius R5 of the first convex portion. The first concave portion 326 can define a radius R6. The radius R6 of the first concave portion 326 can be the same as the radius R2 of the second portion described above with respect to Figure 5. The first recess 326 can define a radius similar to or different from that of the second recess 342, and the third protrusion 328 and the fourth protrusion 340 can each define a radius similar to or different from that of the first protrusion 322.

[0042] The exemplary circumferential sealing surface profiles in Figures 5-7 have convex and concave portions defining radii, but in some other embodiments, one or more of the convex and / or concave portions have straight segments that do not define curvature. In such embodiments, the shape of the circumferential sealing surface can define corners that join one straight segment to another, or a straight segment to a curved segment.

[0043] Figure 8 is an example of a second cross-sectional view of the filter assembly 100, consistent with Figures 1-5. The cross-section is perpendicular to the axial direction and through the filter medium 110 of Figure 3. In this example, the filter medium 110 is a pleated filter medium. The pleated filter medium has a plurality of pleats 306 extending in the axial direction. The first set of pleats 302 is near the outer circumference of the filter medium 110, and the second set of pleats 304 defines the central medium opening 116. In this embodiment, a liner 308 is disposed within the pleated filter medium 110, both defining the central medium opening 116. In some embodiments, the liner 308 can be omitted. The central medium opening 116 is oblong and has a roughly egg-like shape.

[0044] Figure 9 is another example of a second cross-sectional view of the filter assembly 100, consistent with Figures 1-5. The cross-section is axial and perpendicular through the filter medium 110 in Figure 3. In this example, the filter medium 110 is a bag configuration and similarly defines a central medium opening 116 which is elongated elliptical. Unlike the example in Figure 8, the filter medium here does not have a pleated structure.

[0045] Figure 10 is a front view of a portion of an exemplary system consistent with several embodiments, and Figure 11 is an exploded perspective view of a portion of such a system. The system 400 has a tube sheet 410 defining a filter opening 420 and a filter assembly 100 configured to fit with the tube sheet 410 around the filter opening 420.

[0046] The filter assembly 100 can be made consistent with filter assemblies described elsewhere in this specification, in that it has a filter medium 110 extending in the axial direction a and an end cap 130 coupled to a first end 112 of the filter medium 110. The end cap 130 defines an end cap opening 136 communicating with a central medium opening of the filter medium 110, and the end cap 130 has an end cap edge 132 extending outward from the end cap opening 136. Although not visible in the figures described herein, the filter assembly 100 has a circumferential sealing surface 140 having a shape consistent with that shown in Figure 5.

[0047] A tube sheet 410 is generally configured to receive one or more filter assemblies. A tube sheet 410 is generally a substantially planar sheet of material having a length L in the longitudinal direction and a width W in the width direction. Tube sheets 410 are made from various materials and combinations of materials; in one example, a tube sheet 410 is made from metal. In another example, a tube sheet 410 is made from glass fiber. The length L and width W are generally in a plane perpendicular to the axial direction a of the filter assembly 100. The sheet of material defines a series of filter openings 420 along the entire length L and width W of the sheet of material. Each of the filter openings 420 in the series penetrates the sheet of material in the axial direction a.

[0048] Each of the filter openings 420 can have an elongated elliptical shape perpendicular to the axial direction a, as can be seen particularly in Figure 10. Thus, each of the filter openings 420 can have a longitudinal axis l. To accommodate a desired number of filter openings 420 on the tube sheet 410, some of the filter openings 420 can be aligned differently from other filter openings 420 on the tube sheet. In some embodiments, a first plurality of filter openings 430 are defined within the tube sheet 410 such that each of their corresponding longitudinal axes l1 is radially aligned across the tube sheet 410. In some embodiments, a second plurality of filter openings 440 are defined radially across the tube sheet 410 such that each of their corresponding longitudinal axes l2 is radially tangent across the tube sheet 410. In some embodiments, a first filter opening 460 defined by the tube sheet 410 has a first longitudinal axis l1, and a second filter opening 462 defined by the tube sheet 410 has a second longitudinal axis l2, and the first longitudinal axis l1 and the second longitudinal axis l2 are open to each other by 10 to 90 degrees.

[0049] The filter opening is defined by a convex portion 422 extending outward from each of the filter openings 420 and a concave portion 424 extending into each of the filter openings 420. The convex portions 422 and the concave portions 424 are axially aligned.

[0050] In various embodiments, the end cap 130 of the filter assembly 100 is generally configured to fit with a tube sheet 410 around the filter opening 420. In particular, the circumferential sealing surface 140 (see Figure 3) of the end cap 130 is configured to form a seal with the tube sheet 410. In some embodiments, the tube sheet 410 forms a compression fit with the circumferential sealing surface 140. As can be seen by comparing the cross-sectional view of the circumferential sealing surface in Figure 5 and the shape of the filter opening in Figure 10, the filter opening 420 is configured to accommodate the circumferential sealing surface 140. As described with respect to Figure 5, the circumferential sealing surface defines at least one first portion 142 projecting inward toward the end cap opening 136 and a second portion 144 projecting outward from the end cap opening 136. The filter opening 420, configured to receive the filter assembly 100, defines a corresponding outward-facing projection 422 configured to receive a second portion 144 of the circumferential sealing surface 140, and a corresponding recess 424 configured to receive a first portion 142 of the circumferential sealing surface 140.

[0051] In this example, each of the filter openings 420 defines a plurality of axially aligned protrusions 422 and a plurality of recesses 424, where the protrusions 422 alternate with the recesses 424 around each portion of the filter opening 420. The shape of each filter opening 420 defines a first elongated side 452, a second elongated side 454, a first end 456, and a second end 458. The protrusions 422 extend from the filter opening 420 on the first elongated side 452. In this particular example, each elongated side 452, 454 of the filter opening 420 has a plurality of protrusions 422 and a plurality of recesses 424 that successively form a wave shape extending along the curve. The recesses 424 extend within each filter opening on the second elongated side 454. With respect to Figure 5, similar to the shape of the circumferential sealing surface discussed above, the shape of each filter opening 420 is symmetrical.

[0052] Configurations of the circumferential sealing surfaces of the filter opening 420 and filter end cap 130 consistent with the technology disclosed herein can have various advantages. For example, the configuration of the filter opening 420 can be a safety feature that ensures a user cannot install an inappropriate filter assembly into the filter opening 420. As another example, the fluid flow during system operation can exert a force on the filter assembly 100 that can move the filter assembly 100 relative to the tube sheet 410, thereby eliminating the seal between the filter assembly 100 and the tube sheet 410. The structure of the interface defined by both the circumferential sealing surface 140 (Figure 5) and the tube sheet 410 can improve the structural rigidity between the end cap 130 and the tube sheet 410 to reduce the possibility of the filter assembly 100 moving away from the tube sheet 410 during system operation. Such improved structural rigidity can also prevent fluid from bypassing the filter assembly 100 by leaking through a portion of the sealing area between the filter assembly 100 (particularly the end cap 130) and the tube sheet 410.

[0053] In some embodiments, a seal support surface 133 (Figure 3), defined by the end cap edge 132, is configured to abut against the main surface 412 (Figure 11) of the tube sheet 410 around the filter opening 420. In some, but not all, such embodiments, the seal support surface 133 and the main surface 412 are configured to form a seal.

[0054] The circumferential sealing surface of the end cap and the tube sheet are generally configured to fit together to form a fluid seal between the end cap and the tube sheet. Therefore, in embodiments having a contour shape that deviates from the shape shown in Figure 5 (for example, Figures 6 and 7), the filter opening defined by the tube sheet has a corresponding contour shape that allows the tube sheet to fit with the circumferential sealing surface and seal support surface of the end cap. The fluid seal between the end cap and the tube sheet provides separation of the system between the fluid before upstream filtering and the filtrate.

[0055] In some exemplary embodiments of the technology disclosed herein, the tube sheet is oriented substantially parallel to the horizontal plane in space, and the filter assembly attached to the tube sheet has an axial direction that is substantially perpendicular. However, some other embodiments may have alternative orientations.

[0056] Figure 12 is a partial perspective exploded view of an alternative exemplary system 500 consistent with several embodiments, and Figure 13 is a side view of such exemplary system 500. The exemplary system 500 has a tube sheet 510 and a filter assembly 600, the filter assembly 600 having a filter medium 610, an end cap 630 and an expansion insert 700.

[0057] Similar to the example discussed above, the filter assembly 600 has a filter medium 610 coupled to an end cap 630 at a first end of the filter medium 610. The tube sheet 510 defines a plurality of filter openings 520 configured to fit with the filter end cap 630. The filter medium 610, end cap 630, and tube sheet 510 can be made to match the example discussed above and incorporate the above modifications. For example, the filter openings 520 of the tube sheet 510 show the specific configuration discussed above with respect to Figure 11, but the filter openings 520 can have alternative configurations.

[0058] Unlike the previous example, the current exemplary system 500 incorporates an expansion insert 700 configured to form a compression fit with the inner surface 638 of the end cap 630, where the inner surface 638 of the end cap 630 abuts against and surrounds the end cap opening 636. In some embodiments, the expansion insert 700 is configured to exert an expansion force on the end cap 630 through the end cap opening 636. In some embodiments, the expansion insert 700 and the tube sheet 510 can be configured to exert a compressive force on the end cap 630. Such a compressive force can assist in securing the filter assembly 600 to the tube sheet 510.

[0059] The expansion insert 700 has an insertion portion 702 configured to be inserted into the end cap opening 636. The insertion portion 702 defines an outer surface 720 and an insert opening 710. The outer surface 720 is configured to define a compression fit with the inner surface 638 of the end cap 630. The insert opening 710 is configured to communicate fluidly with the end cap opening 636 (which communicates fluidly with a central medium opening defined by the filter medium 610). The expansion insert 700 has a flange 730 extending around the insert opening 710. The flange 730 defines a flange surface 733 (Figure 13) configured to abut against the contact surface 640 of the edge 632 of the end cap 630. In some embodiments, the flange surface 733 is substantially planar.

[0060] The interface between the outer surface 720 of the expansion insert 700 and the inner surface 638 of the end cap 630 can have a shape, size, and configuration similar to the interface between the tube sheet and the circumferential sealing surface of the end cap discussed above. In particular, the outer surface 720 of the expansion insert 700 defines a recess 724 extending inward toward the insert opening 710 and a protrusion 722 extending outward from the insert opening 710. The recess 724 and the protrusion 722 are axially aligned.

[0061] The inner surface 638 of the end cap 630 defines a mating function configured to engage with the outer surface 720. In particular, the inner surface 638 of the end cap 630 defines a mating projection 644 extending into the end cap opening 636. The mating projection 644 is configured to be received by a recess 724 on the outer surface 720 of the expansion insert 700. The inner surface 638 of the end cap 630 defines a mating recess 642 extending from the end cap opening 636, and the mating recess 642 is configured to receive a projection 722 on the outer surface 720 of the expansion insert 700.

[0062] In various embodiments, the outer surface 720 of the insertion portion 702 of the expansion insert 700 can define a plurality of recesses 724 and protrusions 722. In some embodiments, the recesses 724 and protrusions 722 can alternate along a portion of the length of the outer surface 720. In some embodiments, the recesses 724 and protrusions 722 can define a corrugated sealing surface. In such embodiments, the inner surface 638 of the end cap 630 defines a corresponding mating function for receiving the insertion portion 702 of the expansion insert 700.

[0063] In an example consistent with this one, the expansion insert 700 defines a tertiary channel 732 that is in fluid communication with the central medium opening. The tertiary channel 732 can be used to facilitate airflow in the system, and the filter medium 610 is cleaned by pulsating pressurized air into the filter medium, which opens through the end cap opening 636 (and therefore the insert opening 710).

[0064] In various embodiments, the expansion insert 700 defines a plurality of tertiary channels 732. The tertiary channels 732 can communicate fluidly with the end cap opening 636. The tertiary channels 732 can extend in the axial direction a. In some embodiments, the tertiary channels 732 are parallel to the insert opening 710. The tertiary channels 732 can penetrate the flange 730 and the insertion portion 702 of the expansion insert 700. The tertiary channels 732 can penetrate a portion of the outer surface 720 of the insertion portion 702 that defines the protrusion 722.

[0065] In this embodiment, the outer surface 720 of the insertion portion 702 defines recesses and protrusions, but in some other embodiments, the outer surface of the insertion portion (and therefore the inner surface of the end cap) does not define recesses and protrusions. Furthermore, in this embodiment, the filter opening 520 of the tube sheet 510 defines recesses and protrusions (corresponding to the recesses and protrusions of the circumferential sealing surface of the end cap), but in some other embodiments, the filter opening 520 and the circumferential sealing surface do not define recesses and protrusions.

[0066] Redisplay of the embodiment Embodiment 1 A filter medium arranged around a central medium opening, wherein the filter medium has a first end and a second end, and the central medium opening extends axially from the first end to the second end. An end cap coupled to the first end of the filter medium, wherein the end cap defines an opening that fluidly communicates with the central medium opening, an inner surface that abuts against and surrounds the end cap opening, and a circumferential sealing surface around the end cap. Equipped with, The first portion of the circumferential sealing surface protrudes inward toward the end cap opening, and the second portion of the circumferential sealing surface protrudes outward from the end cap opening. The first part and the second part are axially aligned, The circumferential sealing surface forms an elongated elliptical loop in a first cross-section perpendicular to the axial direction. Filter assembly.

[0067] Embodiment 2 The end cap opening is elongated in the first cross-section. A filter assembly according to Embodiment 1 or any one of Embodiments 3 to 12.

[0068] Embodiment 3 The central media opening is elongated elliptical in a second cross-section perpendicular to the axial direction. A filter assembly according to any one of Embodiments 1 to 2 or 4 to 12.

[0069] Embodiment 4 Expansion insert defining the outer surface and the insert opening Furthermore, The outer surface of the expansion insert is configured to define a compression fit with the inner surface of the end cap. A filter assembly according to any one of Embodiments 1 to 3 or 5 to 12.

[0070] Embodiment 5 The expansion insert defines a tertiary flow path that communicates fluidly with the central medium opening. A filter assembly according to any one of embodiments 1 to 4 or 6 to 12.

[0071] Embodiment 6 The outer surface of the expansion insert defines a recess extending inward toward the insert opening and a protrusion extending outward from the insert opening. The recess and the protrusion are axially aligned, and the inner surface defines the fitting function. A filter assembly according to any one of embodiments 1 to 5 or 7 to 12.

[0072] Embodiment 7 The first cross-section of the circumferential sealing surface defines a first end, a second end, a first elongated side portion, and a second elongated side portion, and the first portion and the second portion are defined on the first elongated side portion. A filter assembly according to any one of embodiments 1 to 6 or 8 to 12.

[0073] Embodiment 8 The first portion of the circumferential sealing surface abuts against the second portion of the circumferential sealing surface. A filter assembly according to any one of Embodiments 1 to 7 or 9 to 12.

[0074] Embodiment 9 The end cap defines a plurality of first portions of the circumferential sealing surface and a plurality of second portions of the circumferential sealing surface. A filter assembly according to any one of embodiments 1 to 8 or 10 to 12.

[0075] Embodiment 10 The first part and the second part are arranged alternately. A filter assembly according to any one of embodiments 1 to 9 or 11 to 12.

[0076] Embodiment 11 The filter medium has a bag configuration. A filter assembly according to any one of Embodiments 1 to 10 or 12.

[0077] Embodiment 12 The filter medium has a pleated configuration. A filter assembly according to any one of Embodiments 1 to 11.

[0078] Embodiment 13 A substantially planar sheet of material having a length and width, defining a series of filter openings extending the length and width of the sheet of material. Equipped with, Each of the filter openings in the series of filter openings penetrates the sheet of the material in the axial direction and has an elongated elliptical shape perpendicular to the axial direction, The sheet of the material defines a protrusion extending to each of the filter openings and a recess extending from each of the filter openings, The convex portion and the concave portion are axially aligned. Tube sheet.

[0079] Embodiment 14 Each of the filter openings defines a plurality of axially aligned protrusions and a plurality of recesses, The protrusions are arranged alternately with the recesses around each filter opening. A tube sheet according to Embodiment 13 or any one of Embodiments 15 to 20.

[0080] Embodiment 15 The plurality of protrusions and the plurality of recesses form a waveform that extends along the curve. A tube sheet according to any one of embodiments 13-14 or 16-20.

[0081] Embodiment 16 The aforementioned sheet of material comprises a sheet of metal. A tube sheet according to any one of embodiments 13 to 15 or 17 to 20.

[0082] Embodiment 17 The shape of each filter opening defines a first elongated side portion, a second elongated side portion, a first end portion, and a second end portion, and the protrusion extends from the filter opening at the first elongated side portion. A tube sheet according to any one of embodiments 13 to 16 or 18 to 20.

[0083] Embodiment 18 The recess extends into each filter opening at the second elongated side portion. A tube sheet according to any one of embodiments 13 to 17 or 19 to 20.

[0084] Embodiment 19 The shape of each filter opening is symmetrical. A tube sheet according to any one of embodiments 13 to 18 or 20.

[0085] Embodiment 20 A first filter opening defined within the tube sheet has a first longitudinal axis, a second filter opening defined within the tube sheet has a second longitudinal axis, and the first and second longitudinal axes are open to each other at an angle of 10 to 90 degrees. A tube sheet according to any one of embodiments 13 to 19.

[0086] Embodiment 21 A tube sheet comprising a substantially flat sheet of material having length and width, The aforementioned material sheet defines the filter opening, and the tube sheet, A filter medium having a first end and a second end, defining a central medium opening that extends axially from the first end toward the second end, An end cap coupled to the first end of the filter medium, wherein the end cap defines an end cap opening that fluidly communicates with the central medium opening, an inner surface that abuts against and surrounds the end cap opening, and a circumferential sealing surface around the end cap that is configured to fit with the tube sheet around the filter opening. Equipped with, The first portion of the circumferential sealing surface protrudes inward toward the end cap opening, and the second portion of the circumferential sealing surface protrudes outward from the end cap opening. The first part and the second part are axially aligned, The filter opening defines a corresponding outward-facing projection configured to receive the second portion of the circumferential sealing surface and a corresponding inward-facing projection configured to receive the first portion of the circumferential sealing surface. Filtration system.

[0087] Embodiment 22 An expansion insert that defines the outer surface and the insert opening that communicates fluidly with the central media opening. Furthermore, The outer surface of the expansion insert is configured to define a compression fit with the inner surface of the end cap, The outer surface of the expansion insert defines a recess extending inward toward the insert opening and a protrusion extending outward from the insert opening. The recess and the protrusion are axially aligned, and the inner surface defines the fitting function. A filtration system according to Embodiment 21 or any one of Embodiments 23 to 37.

[0088] Embodiment 23 The circumferential sealing surface defines a first end, a second end, a first elongated side portion, and a second elongated side portion. The first portion and the second portion are defined on the first elongated side portion. A filtration system according to any one of embodiments 21-22 or 24-37.

[0089] Embodiment 24 The first portion of the circumferential sealing surface abuts against the second portion of the circumferential sealing surface. A filtration system according to any one of embodiments 21 to 23 or 25 to 37.

[0090] Embodiment 25 The end cap defines a plurality of first portions of the circumferential sealing surface and a plurality of second portions of the circumferential sealing surface. A filtration system according to any one of embodiments 21 to 24 or 26 to 37.

[0091] Embodiment 26 The first part and the second part are arranged alternately. A filtration system according to any one of embodiments 21 to 25 or 27 to 37.

[0092] Embodiment 27 The circumferential sealing surface forms an elongated elliptical loop in a first cross-section perpendicular to the axial direction. A filtration system according to any one of embodiments 21 to 26 or 28 to 37.

[0093] Embodiment 28 The end cap opening is elongated in the first cross-section. A filtration system according to any one of embodiments 21 to 27 or 29 to 37.

[0094] Embodiment 29 The central media opening is elongated elliptical in a second cross-section perpendicular to the axial direction. A filtration system according to any one of embodiments 21 to 28 or 30 to 37.

[0095] Embodiment 30 The expansion insert defines a tertiary flow path that communicates fluidly with the central medium opening. A filtration system according to any one of embodiments 21 to 29 or 31 to 37.

[0096] Embodiment 31 The filter opening penetrates the tube sheet in the axial direction, and the filter opening is elongated elliptical in a second cross-section perpendicular to the axial direction. A filtration system according to any one of embodiments 21 to 30 or 32 to 37.

[0097] Embodiment 32 The tube sheet defines a protrusion extending into the filter opening and a recess extending from the filter opening, The convex portion and the concave portion are axially aligned. A filtration system according to any one of embodiments 21 to 31 or 33 to 37.

[0098] Embodiment 33 The tube sheet defines a plurality of axially aligned protrusions and a plurality of recesses, The protrusions are arranged alternately with the recesses around each filter opening. A filtration system according to any one of embodiments 21 to 32 or 34 to 37.

[0099] Embodiment 34 The plurality of protrusions and the plurality of recesses form a waveform that extends along the curve. A filtration system according to any one of embodiments 21 to 33 or 35 to 37.

[0100] Embodiment 35 The sheet of the material defines a series of filter openings over the length and width of the sheet of the material. A filtration system according to any one of embodiments 21 to 34 or 36 to 37.

[0101] Embodiment 36 Each of the filter openings in the series of filter openings has an elongated elliptical shape perpendicular to the axial direction. A filtration system according to any one of embodiments 21 to 35 or 37.

[0102] Embodiment 37 The shape of each filter opening is symmetrical. A tube sheet according to any one of embodiments 21 to 36.

[0103] Embodiment 38 A filter medium arranged around a central medium opening, wherein the filter medium has a first end and a second end, and the central medium opening extends axially from the first end to the second end. An end cap coupled to the first end of the filter medium, wherein the end cap defines an end cap opening that fluidly communicates with the central medium opening, an inner surface that abuts against and surrounds the end cap opening, and a circumferential sealing surface around the end cap, An expansion insert that defines the outer surface and the insert opening. Equipped with, The outer surface of the expansion insert is configured to define a compression fit with the inner surface of the end cap, The outer surface of the expansion insert defines a recess extending inward toward the insert opening and a protrusion extending outward from the insert opening. The recess and the protrusion are axially aligned, and the inner surface defines the fitting function. Filter assembly.

[0104] Embodiment 39 The first portion of the circumferential sealing surface protrudes inward toward the end cap opening, and the second portion of the circumferential sealing surface protrudes outward from the end cap opening. The first part and the second part are axially aligned. A filter assembly according to Embodiment 38 or any one of Embodiments 40-44.

[0105] Embodiment 40 The first portion of the circumferential sealing surface abuts against the second portion of the circumferential sealing surface. A filter assembly according to any one of embodiments 38-39 or 41-44.

[0106] Embodiment 41 The end cap defines a plurality of first portions of the circumferential sealing surface and a plurality of second portions of the circumferential sealing surface. A filter assembly according to any one of embodiments 38-40 or 42-44.

[0107] Embodiment 42 The circumferential sealing surface forms an elongated elliptical loop in a first cross-section perpendicular to the axial direction. A filter assembly according to any one of embodiments 38-41 or 43-44.

[0108] Embodiment 43 The expansion insert defines a tertiary flow path that communicates fluidly with the central medium opening. A filter assembly according to any one of embodiments 38 to 42 or 44.

[0109] Embodiment 44 The first cross-section of the circumferential sealing surface defines a first end, a second end, a first elongated side portion, and a second elongated side portion, and the first portion and the second portion are defined on the first elongated side portion. A filter assembly according to any one of embodiments 38 to 43.

[0110] When used herein and in the appended claims, the phrase “configured” should also be noted to describe a system, apparatus, or other structure that is created or configured to perform a particular task or employ a particular configuration. The term “configured” may be used interchangeably with similar terms such as “arranged,” “created,” and “manufactured.”

[0111] All publications and patent applications herein represent the level of skill of those skilled in the art. All publications and patent applications are incorporated herein to the same extent by reference as individual publications or patent applications are specifically and individually indicated by reference. In the event of any inconsistency between the disclosure of this application and the disclosure of any document incorporated herein by reference, the disclosure of this application shall prevail.

[0112] This application is intended to cover adaptations or variations of the subject matter. The above description is intended to be illustrative and not limiting, and it should be understood that the claims are not limited to the embodiments described herein.

Claims

1. A tube sheet comprising a substantially planar sheet of material having length and width, wherein the sheet of material defines a filter opening, A filter medium having a first end and a second end, defining a central medium opening that extends axially from the first end toward the second end, An end cap coupled to the first end of the filter medium, The central medium opening and the end cap opening that communicate with fluid, The inner surface that abuts against and surrounds the end cap opening, The end cap comprises a circumferential sealing surface around the end cap, which is configured to fit with the tube sheet around the filter opening, and an end cap defining the circumferential sealing surface around the end cap. The first portion of the circumferential sealing surface protrudes inward toward the end cap opening, and the second portion of the circumferential sealing surface protrudes outward from the end cap opening. The first part and the second part are axially aligned, The filter opening defines a corresponding outward-facing projection configured to receive the second portion of the circumferential sealing surface and a corresponding inward-facing projection configured to receive the first portion of the circumferential sealing surface. Filtration system.

2. The device further comprises an outer surface and an expansion insert that defines an insert opening that communicates fluidly with the central medium opening, The filtration system according to claim 1, wherein the outer surface of the expansion insert is configured to define a compression fit with the inner surface of the end cap.

3. The filtration system according to claim 2, wherein the expansion insert further defines a tertiary flow path that communicates with the central medium opening.

4. The filtration system according to any one of claims 1 to 3, wherein the first portion of the circumferential sealing surface abuts against the second portion of the circumferential sealing surface.

5. The tube sheet defines a protrusion extending into the filter opening and a recess extending from the filter opening, and the protrusion and the recess are axially aligned. The filtration system according to any one of claims 2 to 4.

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