Filter media support cage assembly and device comprising such cage assembly

Abstract

A filter media support cage assembly (1) for a filter media support structure (100) configured to support a filter media pack (101) in a filter cartridge (110), the cage assembly (1) defining an internal volume (V) and comprising two or more cage wall members (4) extending in a length direction (L) from a first end (2) to a second end (3), each of the cage wall members (4) has an inner side (5) facing the inner volume (V) when assembled and an outer side (6) facing the filter media pack (101) when installed in the filter cartridge, and the cage assembly (1) has a grid structure, according to the invention, the cage wall member comprises a lattice structure comprising column elements (7) extending substantially in the length direction (L) and beam elements (8) extending in the cage circumferential direction, and the cage wall member comprises one or more column connection sections (11) extending in the cage circumferential direction, and the column connection sections comprise column connection sheet elements (12), the column connecting sheet elements are located between and attached to adjacent column elements (7) and extend in the length direction (L). A filter media support structure (100), a filter cartridge (110) and an air filtration device (120) comprising a filter cartridge are disclosed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air filters in which a filter media pack is supported by a cage structure. Background Art

[0002] Hollow air filters typically include some means of containing the filter media, such as a cage placed inside and supporting the hollow air filter media pack. The cage is typically made of rolled steel mesh, which can provide adequate stability and is economical due to its circular shape. However, there is a continuing desire to improve performance and reduce costs in air filtration, and therefore a need for improved air filters that exhibit adequate stability and are easy to manufacture. Summary of the invention

[0003] The object of the present disclosure is to provide a filter medium support structure, which is configured to support a filter medium pack in a filter cartridge, and the filter medium support structure has high strength and is easy to manufacture. Therefore, a filter medium support cage assembly for a filter medium support structure is provided, which is configured to support a filter medium pack in a filter cartridge, the cage assembly defines an internal volume, and includes two or more cage wall members extending from a first end to a second end in a length direction, each of the cage wall members has an inner side facing the internal volume when assembled and an outer side facing the filter medium pack when installed in the filter cartridge, and the cage assembly has a grid structure, which includes column elements extending substantially in the length direction and beam elements extending in the cage circumferential direction, and the cage wall member includes one or more column connection sections extending in the cage circumferential direction, and the column connection sections include column connection sheet elements, which are located between and attached to adjacent column elements and extend in the length direction. The cage assembly may be suitably adapted to be included in a pulse filter media support structure configured to support a pulse filter media pack in a pulse filter cartridge, and the cage assembly may be tapered so as to be narrower at the first end than at the second end. The column element may extend from the inner side of the cage wall member to the outer side of the cage wall member in the cross-wall direction, and have a width in the cross-wall direction and a thickness in the cage circumferential direction, wherein the width is 1.5 to 50 times, preferably 2 to 25 times, more preferably 3 to 10 times the thickness. The beam element may preferably be located at the outer side of the cage wall member.

[0004] The column connecting sheet element preferably extends substantially along the length direction and extends from the inner side of the cage wall member to the outer side of the cage wall member in a direction towards the first end, and wherein the column connecting sheet element preferably has a length from the first edge to the second edge that is at least 4 times the thickness of the column connecting sheet element, and the column connecting sheet element may suitably include a curved portion located near the first end of the cage wall member, thereby being configured to guide the air flow through the cage during use of the filter cartridge. The column connecting sheet element may further preferably have an angle of attack relative to the air flow entering the cage radially through the cage wall, the angle of attack being between 5° and 85°, the angle of attack being the angle between the radial direction of the cage and the straight line connecting the first edge and the second edge of the column connecting sheet element. The beam element may be an integral part of the column connecting sheet element, or may be separate from the column connecting sheet element. The beam element may extend in a cage circumferential direction substantially perpendicular to the length direction. The cage wall member may further include one or more cross-support sections extending in the cage circumferential direction, and the cross-support sections include inclined cross-support elements extending between adjacent column elements.

[0005] The cage wall members of the cage assembly can advantageously be held together by one or more retaining rings. The cage wall members can be configured to align with each other or interlock to form a cage. Suitably, all cage wall members can have substantially the same shape. The cage assembly can advantageously include four cage wall members, the wall members preferably being substantially flat. In addition, one or more of the cage wall members can include two or more notches, the notches being positioned on the inner side of the cage wall member along a center line extending in the length direction of the cage wall member, and the notches can preferably be located in the column connection section. The cage wall member can advantageously be made of a corrosion-resistant material, preferably made of a plastic material or a polymer composite material. The cage wall member is preferably a one-piece piece, most preferably obtained by injection molding.

[0006] The present disclosure also relates to a filter media support structure, which includes a filter media support cage assembly as described above, and a first end plate attached at a first end of the cage assembly and a second end plate attached at a second end of the cage assembly, the first end plate being closed or having an opening for air to flow out of or into the interior volume of the cage assembly, and the second end plate having an opening for air to flow out of or into the interior volume of the cage assembly, the filter media support structure preferably including one or more corner brackets arranged in the opening of the second end plate.

[0007] The present disclosure further relates to a filter cartridge, which comprises the filter support structure according to the second aspect and a filter medium pack. The filter cartridge is preferably a pulse filter cartridge.

[0008] In addition, an air filter device is provided, which includes the above-mentioned filter cartridge, a mounting frame, and a filter cartridge abutment plate including an air flow opening, wherein the filter cartridge is fastened to the mounting frame so that the filter cartridge is located above the opening and the second end plate abuts the filter cartridge abutment plate. The air filter device may include two filter cartridges mounted on top of each other, wherein the first end plate of one filter cartridge has an opening for air to flow out of or into the internal volume, and the other filter cartridge has a closed first end plate.

[0009] The present disclosure will become apparent from the detailed description given below. The detailed description and specific examples disclose preferred embodiments of the present disclosure only by way of illustration. Those skilled in the art will understand from the guidance in the detailed description that modifications and variations can be made within the scope of the present disclosure.

[0010] Therefore, it should be understood that the invention disclosed herein is not limited to the specific component parts of the device described, because such devices can change. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and are not intended to be restrictive. It should be noted that, as used in the specification and the appended claims, unless the context clearly indicates otherwise, the articles "one", "a", "the" and "said" are intended to represent one or more elements in the element. Therefore, for example, the "unit" or "the unit" mentioned may include several devices, etc. In addition, the words "include", "comprise", "contain", "contain" and similar terms do not exclude other elements or steps.

[0011] Detailed description

[0012] The present disclosure is intended to provide a filter media support structure that has high strength and is easy to manufacture, and is configured to support a filter media pack in a filter cartridge. Therefore, a filter media support cage assembly for a filter media support structure is provided, the filter media support cage assembly is configured to support a filter media pack in a filter cartridge, the filter media support cage assembly has a configuration that provides sufficient strength and stability, and is simple and effective to manufacture.

[0013] The cage assembly can be used in different types of hollow filters, where air flow is directed from the outside of the filter media pack to the interior volume, or from the inside of the filter media pack to the outside. The cage assembly can be advantageously included in a pulse filter media support structure configured to support a pulse filter media pack in a pulse filter cartridge, because the strength and stability of the cage assembly can withstand the forces of the filter air flow and the pulse air flow with the opposite flow direction.

[0014] The cage assembly defines an internal volume and includes two or more cage wall members extending from a first end to a second end in a length direction. The two or more cage wall members can be designed to be very easy to assemble, as will be described in more detail below. Each of the cage wall members has an inner side facing the internal volume when assembled and an outer side facing the filter media pack when installed in the filter cartridge. The wall member has a grid structure, which includes column elements and beam elements, wherein the column elements provide stability in the length direction of the cage assembly, and the beam elements connect the column elements and provide strength and stability in the circumferential direction. The column elements extend substantially in the length direction, that is, the column elements generally extend from the first end of the wall member to the second end of the wall member, but do not need to be parallel to each other or parallel to the length direction of the wall member. Depending on the size of the filter media pack supported by the cage assembly, each wall member can include two or more column elements, and can include, for example, 6 to 10 column elements. The distance between adjacent column elements can depend on the number of column elements and the circumferential width of the cage wall member. When the cage assembly is used in a pulse filter cartridge adapted to be mounted on a mounting frame, such as a tripod, the column elements of the wall member will also support axial loads applied to the filter cage assembly when the filter cage assembly is installed.

[0015] The beam elements extend in the circumferential direction of the cage, i.e. the beam elements generally extend from one side of the wall member to the other side, and may be arranged in a direction perpendicular to the length direction of the wall member, or may be inclined at an angle between the length direction and a direction perpendicular to the length direction.

[0016] The cage wall member also includes one or more column connection sections as part of a grid, the column connection sections extending in the cage circumferential direction, and similar to the beam elements, the column connection sections can be arranged in a direction perpendicular to the length direction of the wall member, or can be inclined at an angle between the length direction and the direction perpendicular to the length direction. The column connection sections include column connection sheet elements, which are located between and attached to adjacent column elements and extend in the length direction. Therefore, the column connection sheet elements and beam elements can be arranged for connecting column elements at multiple points, and thus for stabilizing the cage assembly while still allowing air flow through.

[0017] The filter media pack may be of any suitable type and may generally be a hollow structure wherein the pleated filter media pack extends in a circumferential direction and wherein the pleats extend along the length of the cage wall member.

[0018] The column element may extend from the inner side of the cage wall member to the outer side of the cage wall member in the cross-wall direction, and the width in the cross-wall direction (radial direction) may be greater than the thickness in the cage circumferential direction, for example, the width may be 1.5 to 50 times the thickness, preferably 2 to 25 times, more preferably 3 to 10 times. This means that the distance between the inside and the outside of the cage assembly is at least 1.5 times the thickness of each individual column element, which increases the strength of the cage assembly and reduces the risk of buckling in the radial direction during use. The width of the column element in the cross-wall direction may suitably be at least 10 mm.

[0019] The beam elements may preferably be located at the outer side of the cage wall member, preferably flush with the outer side of the column elements. This allows the beam elements to support the filter media pack, and the lateral orientation of the beam elements prevents the pleats of the pleated filter media pack from sliding around the column elements. Furthermore, such a position of the beam elements allows the column connecting sheet elements to be located inboard of the outer side of the cage assembly.

[0020] The column connecting sheet element preferably extends substantially in the length direction of the wall member and is thus connected to the column element along its entire length. Since the column connecting sheet element is connected to the column element on each side along its entire length, the stability of the cage assembly is improved. In addition, the column connecting sheet element also preferably extends from the inner side of the cage wall member to the outer side of the cage wall member in a direction towards the first end, so that the column connecting sheet element has a first edge and a second edge located at or near the inner side of the cage assembly relative to the air flow directed from the outside of the cage assembly towards the internal volume located at or near the outer side of the cage assembly. Therefore, for the air flow directed from the outside of the cage assembly towards the internal volume, the first edge will be the leading edge and the second edge will be the trailing edge, and for the air flow directed from the air passage opening at the second end of the cage assembly, the second edge (located at or near the inner side of the cage assembly) will be the leading edge and the first edge (located at or near the outer side of the cage assembly) will be the trailing edge. Thus, the post-connected sheet elements are arranged in an inclined manner so that the post-connected sheet elements can act as vanes, which improves the air flow through the filter cartridge by redirecting the air flow from a radial direction in which it enters the filter media pack and the cage assembly to an axial direction in which it exits the interior volume of the filter cartridge through the second end of the cage assembly. The post-connected sheet elements can have a length from a first edge to a second edge that is at least 4 times the thickness of the post-connected sheet elements so that the air flow can easily pass through the cage assembly and change direction. When the first edge of the post-connected sheet elements is flush with the outer side of the cage, the post-connected sheet elements can help support the filter media pack.

[0021] The post connecting sheet element may also suitably include a curved portion positioned proximate said first end of the cage wall member, thereby being configured to direct air flow through the cage during use of the filter cartridge, which further improves air flow through the cage and filter media pack in both directions and, in the case of a pulse filter, also results in a better pulsation effect.

[0022] The post-connected sheet element may further preferably have an angle of attack between 5° and 85° relative to air flow radially through the cage wall into the cage, the angle of attack being the angle between the radial direction of the cage and a straight line connecting the first edge and the second edge of the post-connected sheet element. The post-connected sheet element may be curved and positioned so that the post-connected sheet element presents a concave surface for both air flow radially through the filter medium into the air filter cartridge and air flow from an axial direction through the second open end into the air filter cartridge.

[0023] The wall members of the cage assembly may include beam elements and alternating sections of column connecting sections including column connecting sheet elements, in which case the beam elements are separate from the column connecting sheet elements.

[0024] Alternatively, the beam element may be an integral part of the column connecting sheet element and be located in the form of a beam part at the first end of the column connecting sheet element at the outer side of the wall member, preferably flush with the outer side of the column element.

[0025] The column connecting sections may be arranged in a circumferential direction of the cage assembly, which is substantially perpendicular to the length direction of the wall member, whereby the column connecting sheet elements of one column connecting section may be positioned side by side at the same length position of the wall member.

[0026] Alternatively, the column connection sections may be arranged in a circumferential direction of the cage assembly that is angled with respect to the length direction of the wall member, whereby the column connection sheet elements between adjacent column elements may be located at different length positions of the wall member. The column connection sections on each side of the longitudinal centerline of the wall member may be inclined in different directions to form, for example, a herringbone or feather configuration.

[0027] The cage wall member may also include one or more cross support sections as part of a grid, the cross support sections extending in a cage circumferential direction, which may be perpendicular or angled to the length direction of the wall member, and the cross support sections include inclined cross support elements extending between adjacent column elements, which may additionally reduce the risk of buckling of the cage during use.

[0028] The wall member may preferably be substantially flat, ie completely flat or only slightly curved in the circumferential direction.

[0029] The cage wall member may advantageously be made of a corrosion resistant material, preferably a plastic material or a polymer composite, which may be advantageous when operating the filter in a corrosive environment. Plastic material or polymer composites have the further advantage of being lightweight compared to metals such as steel, for example, and allow efficient manufacturing since complex shapes can be incorporated into the wall member. For example, non-reinforced or reinforced ABS may be used.

[0030] Each cage wall member is preferably a one-piece piece, which can advantageously be obtained by injection molding. Forming the cage from two or more wall members, which extend along the entire length of the cage and are assembled to the cage at the sides of the wall members, allows for easier manufacture of the cage, since the wall members can be manufactured by injection molding, so that the wall members can be made of plastic material. The wall members are then assembled to the cage, the structure of which may be difficult to obtain in a one-piece structure from plastic material.

[0031] Injection molding is an efficient and low-cost manufacturing method, whereby a strong wall member can be obtained in one step, and the various grid elements do not need to be joined in a separate step. This therefore allows the wall member to have a complex configuration while still being easy to manufacture.

[0032] In contrast, in the prior art, a hollow one-piece filter support structure can be obtained, for example, by extrusion, but this method will not allow the resulting filter support structure to have a complex design, such as the design of the cage according to the present invention, which includes column elements and beam elements, as well as circumferential column connection sections and column connection sheet elements located between adjacent column elements and attached to adjacent column elements.

[0033] All cage wall members of the cage assembly can suitably have substantially the same shape, i.e. the same grid configuration, so that the cage wall members can be manufactured in the same mold and can be stacked for efficient transportation. In order to allow simple assembly, the cage wall members can be suitably configured to align with each other or interlock to form a cage. Various alternatives for the connecting elements for connecting the wall members can be envisioned, for example, the wall members can have completely flat sides that abut against each other when installed, or interlocking shapes, such as corresponding protrusions and recesses, can be provided on the side surfaces of the wall members. The assembly of the cage can be facilitated by providing a retaining ring that holds the wall members together during installation in the filter support structure including the cage assembly. The retaining ring can also improve the strength of the cage in the radial direction.

[0034] The cage assembly may advantageously comprise four substantially flat cage wall members. Thereby, a substantially square or rectangular cross section transverse to the length direction of the cage assembly may be obtained. Compared to a cage assembly with a circular cross section, a square cage assembly will have a larger opening and a larger total cage filter area, which results in a reduced pressure drop. Since all connecting elements may act as blades and are incorporated into the inner cage, the air passing through the filter is better guided to the filter outlet and the pressure drop is thus reduced.

[0035] The wall members may be tapered so that the cage assembly is narrower at the first end than at the second end when installed, to facilitate installation in air filter devices with limited space or obstructions, and to improve air flow through the filter media pack, especially when pleated filter media packs are used. In a tapered cage, the connecting elements, which may act as air flow guide vanes, may have an additional pulsed air flow guiding effect because the connecting elements may gradually "cut off" or "cut off" portions of the pulsed air flow pulses as they enter through the open end of the cartridge ( Fig.15 ), so that the kinetic energy has been converted into static pressure in the compartment consisting of the blade and the adjacent beam side, and flows to the media pack.

[0036] When installing a tapered cage assembly, using a retaining ring is particularly advantageous because the retaining ring can be slid just over the top of the cage to a position where the circumference of the cage assembly corresponds to the size of the retaining ring. Preferably, the retaining ring is configured to mate with the circumference of the cage assembly at a position approximately halfway along the length of the cage.

[0037] Furthermore, one or more of the cage wall members may include two or more notches located on the inner side of the cage wall member along a centerline extending in the length direction. When the cage assembly is mounted on a mounting frame, the notches may facilitate correct positioning of the cage assembly on the mounting frame, particularly when the cage assembly has a non-circular cross-section. For example, when a square cage assembly is mounted on a tripod mounting frame, the notches may engage with the uppermost tripod leg to place the cage assembly in the correct position. The notches may preferably be located in the column connection section of the cage wall member.

[0038] The above-mentioned cage assembly is intended to be included in a filter media support structure together with a first end plate and a second end plate. The first end plate is attached at the first end of the cage assembly and may be closed or may have an opening for air to flow out of or into the interior volume of the cage assembly. The second end plate is attached at the second end of the cage assembly, and the second end plate has an opening for air to flow out of or into the interior volume of the cage assembly. The first end plate and the second end plate include an attachment portion configured to interlock with the first end and the second end of the cage assembly, respectively, and also include a filter media pack retaining portion extending radially outward from the cage assembly, and a receiving surface, and the receiving surface is configured to receive the end of the hollow filter media pack. The filter media pack is appropriately attached and sealed to the end plate by a suitable adhesive. The end plate may be provided with a centering bevel configured to fit into the cage for easy assembly. A corner bracket may be arranged in the opening of the second end plate and may help position the non-circular cage assembly on the mounting frame because it prevents the support structure from hanging on the corner of the mounting frame and thus prevents the mounting frame from being stuck in the corner of the support structure.

[0039] A filter cartridge according to the present disclosure includes a filter support structure and a filter media pack as described above. The filter cartridge may be particularly useful as a pulse filter cartridge. If desired, two filter cartridges can be assembled to form a longer filter cartridge assembly, which will then include two filter support structures mounted on top of each other, wherein the filter media pack is retained between the end plates of each support structure. In this case, the support structures and therefore the cage assembly have different sizes, so that the size of the first end plate of one support structure matches the size of the second end plate of another support structure. Then, the first end plate of one support structure can have an opening for air to flow out of or into the internal volume, and will be placed near the second end plate, and the other support structure can have a closed first end plate. Thus, the cartridge assembly will have an entire interior extending from the second end of a support structure to the closed end of another support structure. If desired, more than two support structures can be included in the cartridge assembly in a similar manner.

[0040] As mentioned above, the cage of the present invention and the filter cartridge including the cage may be particularly useful in a pulse filter. Pulse air filters are commonly used in industrial applications to remove particulate matter from air or gas streams. Pulse air filters operate based on the principle of using short pulses of compressed air to clean the filter elements. The operation of a pulse air filter typically includes a filtering phase and a cleaning phase. During the filtering phase, contaminated air or gas containing particles enters the filter chamber of the filter system. The chamber typically includes a plurality of filter elements, which are typically cylindrical cartridges or bags made of porous filter media materials. When the air passes through the filter elements, the particles present in the air are trapped on the surface of the filter media or within the porous structure. The filter elements cause the captured particulate matter to gradually accumulate, which results in an increase in pressure drop and energy consumption.

[0041] In order to maintain the performance of the filter and prevent excessive pressure drop across the element, regular cleaning is necessary. This is where the air pulse mechanism comes into play. The cleaning phase consists of releasing a pulsed air stream of compressed air from one or more nozzles or blowpipes located above or inside the filter element on the clean side.

[0042] A pulse air filter cartridge generally has the following structure: in which a hollow filter media pack is arranged so that a closed internal space is formed inside the filter media pack. When the pulse air flow enters the interior of the hollow air filter cartridge from the open end of the filter cartridge, i.e., upstream of the filter media, the pulse air flow will take the easiest way. This means that the pulse air flow will first reach the closed end of the internal space before changing direction and passing through the filter media in a direction transverse to the surface of the filter media. The air flow of the compressed air pulse has a very high velocity, typically about 300 m / s or more, and therefore has very high kinetic energy. When the pulse air flow reaches the closed end of the pulse filter cartridge, it stops, and the kinetic energy is converted into static pressure. Near the closed end of the filter cartridge, the static pressure will be very high, and the pressure inside the filter media pack will therefore immediately be significantly higher than the pressure outside the filter media pack. Therefore, the pulse of compressed air produces a reverse airflow in the filter element. This is shown in Figures 13 to 14. Fig.15 The sudden increase in pressure and velocity causes the filter media to flex and vibrate, thereby removing the accumulated particulate matter from the surface, from the surface of the fibers within the media structure or within the pores. The particles are then shaken off and fall into a collection hopper or collection box located below the filter chamber, or directly to the ground if the pulse filter is positioned as the first stage of the air intake. After the pulse cleaning stage, the pulse air filter can enter the filtering stage again.

[0043] In a conventional pulse air filter, the pulse effect, and therefore cleaning, will be most effective near the closed end of the pulse air filter cartridge, as schematically illustrated in Figure 13. However, a portion of the static pressure energy will propagate and cause an increase in static pressure further back in the cartridge, i.e., closer to the open end of the cartridge. This effect will diminish in the direction toward the open end of the pulse air filter cartridge.

[0044] It is desirable to obtain a more uniform and therefore effective pulse effect across the entire filter media pack. According to the present disclosure, this is addressed by arranging a connecting element on the upstream side of the filter media pack relative to the pulse air flow direction, the connecting element can act as an air flow guide vane. The presence of the air flow guide vane can contribute to improving the pulse effect by partially blocking the passage through the filter media in the radial direction, thereby increasing the proportion of static pressure propagating backwards toward the open end of the filter cartridge, so that the high static pressure inside the filter media pack becomes more evenly distributed in the internal volume of the filter cartridge during the pulse, and the pulse cleaning will be more effective across the entire filter media pack. The vanes thus guide the pulsed air flow so that the pulsed air flow is properly distributed over the filter media (below) before it is allowed to pass through the filter media and blow off the particles captured thereby. Figure 14 to Figure 15 ). At the same time, the air flow guide vanes have a shape that does not obstruct the air flow or increase the pressure drop during the filtering phase. During the pulse, the compressed air flow may force the filter media to move in a downstream direction, which may damage the media pack unless precautions are taken. Therefore, the pulse air filter cartridge may appropriately include an external support structure arranged around the outer periphery of the filter media pack to hold the filter media pack in place during the cleaning phase, thereby preventing the air pulse from blowing away and damaging the filter media pack. The external support structure may preferably include a rope or wire wrapped or coiled around the filter media pack, or a net wrapped around the media pack, or one or more rings placed on the periphery of the filter media pack. The external support structure may be made of any suitable material, such as metal or plastic.

[0045] In addition, an air filtering device is provided, which includes the above-mentioned filter cartridge or filter cartridge assembly, a mounting frame, and a filter cartridge abutment plate including an air flow opening, wherein the filter cartridge is fastened to the mounting frame so that the filter cartridge is located above the opening and the second end plate abuts the filter cartridge abutment plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The foregoing objects, features and advantages of the present disclosure will be more fully understood by referring to the following illustrative and non-limiting description of example embodiments of the present disclosure when taken in conjunction with the accompanying drawings.

[0047] Figure 1 A cage wall member of a cage assembly of the present disclosure is shown;

[0048] Figure 2 yes Figure 1 A side view of a cage wall member;

[0049] Figure 3 showing the cage assembly as viewed from a second end of the cage assembly;

[0050] Figure 4 A detail of a wall member with column-connected sheet elements is shown;

[0051] Figure 5 A support structure of the present disclosure is shown, comprising a cage assembly and an end plate;

[0052] Figure 6 shows a view from the second end of the cage assembly Figure 5 Support structure;

[0053] Figure 7 A filter cartridge including a support structure and a filter media pack is shown;

[0054] Figure 8 A support structure having a closed first end plate is shown;

[0055] Fig. 9 shows wall members in alternative configurations;

[0056] Fig.10 A filter cartridge comprising two support structures located on top of each other is shown;

[0057] Fig.11 An air filter assembly including a filter cartridge of the present disclosure is shown.

[0058] Fig.12 Shows Fig.10 An air filter device, wherein an external support structure is arranged on the outside;

[0059] FIG13 schematically illustrates pulsed air flow in a conventional pulsed air filter cartridge;

[0060] Fig.14 and Fig.15 Pulsed air flow in a pulse air filter cartridge according to the present disclosure is schematically illustrated. DETAILED DESCRIPTION

[0061] The present disclosure will now be described with reference to the accompanying drawings, in which preferred example embodiments of the present disclosure are shown. However, the present disclosure may be implemented in other forms and should not be construed as being limited to the embodiments disclosed herein. The disclosed embodiments are provided to fully convey the scope of the present disclosure to the skilled person.

[0062] Figures 1 to 4The filter media support cage assembly 1 and its details according to the present disclosure are illustrated. The cage assembly is intended to be included in a filter media support structure 100 ( Figure 5 to Figure 6 ), the filter medium support structure 100 is configured to support the filter medium pack 101 ( Figure 7 ). Fig. 9 An alternative configuration of wall members for use in a cage assembly of the present disclosure is illustrated. In the example shown, the cage assembly 1 defines an interior volume V and includes four cage wall members 4. The wall members 4 extend from a first end 2 to a second end 3 along a length direction L. Each cage wall member 4 has an inner side 5 facing the interior volume V when assembled and an outer side 6 facing the filter media pack 101 when installed in the filter cartridge. Figure 1 , Figure 5 and Figure 8 As best shown in FIG. 1 , the cage assembly 1 has a lattice structure including column elements 7 extending substantially in a length direction L and beam elements 8 extending in a cage circumferential direction. The cage wall member includes a column connection section 11 extending in the cage circumferential direction, the column connection section 11 including column connection sheet elements 12 located between and attached to adjacent column elements 7 and extending in the length direction L. In the example shown, the cage assembly 1 is tapered so as to be narrower at the first end 2 than at the second end 3.

[0063] The column element 7 extends from the inner side 5 to the outer side 6 of the cage wall member in the cross-wall direction CW. The column element 7 has a width w7 in the cross-wall direction and a thickness t7 in the cage circumferential direction, wherein the width w7 is 1.5 to 50 times, preferably 2 to 25 times, more preferably 3 to 10 times the thickness t7. In the example shown, the beam element 8 is located at the outer side of the cage wall member 4.

[0064] The column connecting sheet element 12 extends substantially along the length direction L and extends from the inner side 5 of the cage wall member to the outer side 6 of the cage wall member in the direction towards the first end 2. The length of the column connecting sheet element 12 from the first edge 16 to the second edge 17 is at least 4 times the thickness of the column connecting sheet element. Figure 4 As illustrated in FIG. 1 , the post-connected sheet element 12 may include a curved portion located proximate to the first end 2 of the cage wall member, thereby being configured to direct the air flow through the cage during use of the filter cartridge. The post-connected sheet element 12 has an angle of attack between 5° and 85° relative to the air flow entering the cage radially through the cage wall. The angle of attack is the angle between a direction perpendicular to the outer side 6 of the cage and a straight line connecting the first edge 16 and the second edge 17 of the post-connected sheet element.

[0065] exist Figures 1 to 6In the example of , the beam elements 8 are separated from the column connecting sheet elements 12 and extend in a cage circumferential direction substantially perpendicular to the length direction L. In this example, the cage wall member further comprises a cross support section 9 extending in the cage circumferential direction, the cross support section 9 comprising inclined cross support elements 10 extending between adjacent column elements 7.

[0066] exist Fig. 9 In the example shown, the beam elements 8 are an integral part of the column-connected sheet elements 12 .

[0067] Figure 5 It is shown how the cage wall members are held together by a retaining ring 13. The cage wall members 4 are configured to align or interlock with each other to form a cage.

[0068] In the illustrated example, all cage wall members 4 of the cage assembly have substantially the same shape, and the cage assembly comprises four substantially flat cage wall members.

[0069] like Figure 1 , Figure 3 , Figure 5 and Figure 6 As seen in FIG. 1 , the cage wall member may include two or more notches 14 located on the inner side of the cage wall member along a centerline extending in the length direction of the cage wall member. The notches 14 are located in the column connecting section 11 .

[0070] Figure 5 , Figure 6 and Figure 8 1 shows a filter media support structure comprising a filter media support cage assembly 1, a first end plate 21a, 21b attached at a first end 20 of the cage assembly, and a second end plate 22 attached at a second end 30 of the cage assembly. The first end plate 21a may be a closed ( Figure 8 ). Alternatively, the first end plate 21b may have an opening for air to flow out of or into the interior volume V of the cage assembly. The second end plate 22 has an opening for air to flow out of or into the interior volume V of the cage assembly. Figure 6 It is shown how the corner bracket 15 may be arranged in the opening of the second end plate 22 .

[0071] Fig.10 The illustration shows a filter comprising two filter support structures 100 mounted on top of each other, wherein the first end plate 21b of one support structure has an opening for air to flow out of or into the internal volume V, and the other support structure has a closed first end plate 21a, and wherein each filter support structure holds a filter media pack 101.

[0072] Fig.11An air filter device is shown, which includes two filter cartridges 110 and 111 located on top of each other, and an example of how the filter cartridge can be installed in the air filter device is illustrated. The air filter device is preferably a pulse filter device. A support cage is arranged inside the hollow filter medium bag 101, and a front panel 21a closes the hollow air filter medium at the front end of the support cage. A mounting frame 131 in the form of a tripod is attached to an air passage opening 133 in a base plate 134. The two cartridges 110, 111 are placed on the tripod, wherein the rear cartridge 111 is closest to the opening 133, and the rear end plate 22 of the rear cartridge 111 abuts against the surface of the base plate 134. The front cartridge 110 is positioned so that its rear end plate 22 contacts the front end plate 21b of the rear cartridge 111. Other ways of installing the air filter cartridge can be envisioned.

[0073] Fig.12 Shows Fig.10 An air filter device of the type described herein, wherein an outer support structure 114 is arranged on the outside in the form of a rope wound around the outer surface of the media pack.

[0074] Figure 13 schematically illustrates the pulsed air flow in a conventional pulse air filter cartridge. In operation, during the pulse cleaning phase, a compressed pulse enters the interior of the cage 141 at the open end 143 and the hollow filter media pack (not shown), and directly reaches the closed end 142 of the filter cartridge. The kinetic energy of the pulse is converted into static pressure, causing the air pulse to pass through the cage and filter media with the greatest force near the closed end 142.

[0075] Fig.14 and Fig.15 The pulse air flow in the pulse air filter cartridge according to the present disclosure is schematically illustrated. Here too, the compressed pulse enters the interior of the cage 1 at the open end 133 and the hollow filter media pack (not shown) and directly reaches the closed end 135 of the filter cartridge. In these cartridges, the pulse air flow guide vanes 11 are provided, which guide and distribute the pulse air flow more evenly on the filter media pack.

[0076] In addition, if Fig.15 As shown in , in the case of a tapered cage, a major portion of the pulsed air flow may also be intercepted by the blades 11, so that this portion of the air pulse passes through the filter medium before it reaches the closed end 135. It is recognized by those skilled in the art that the present disclosure is not limited to the preferred embodiments described above. It should also be recognized that various modifications and variations are possible within the scope of the appended claims. In addition, based on a study of the drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement variations of the disclosed embodiments when practicing the claimed disclosure.

Claims

1. A filter media support cage assembly (1) for a filter media support structure (100), the filter media support cage assembly (1) being configured to support a filter media pack (101) in a filter cartridge (110), the cage assembly (1) defining an interior volume (V), characterized in that: The cage assembly comprises two or more cage wall members (4) extending from a first end (2) to a second end (3) along a length direction (L), each of the cage wall members (4) having an inner side (5) facing the inner volume (V) when assembled and an outer side (6) facing the filter medium pack (101) when installed in the filter cartridge, and the cage assembly (1) has a grid structure, the grid structure comprising column elements (7) extending substantially along the length direction (L) and beam elements (8) extending along the cage circumferential direction, and the cage wall member comprises one or more column connection sections (11) extending along the cage circumferential direction, and the column connection section (11) comprises a column connection sheet element (12), the column connection sheet element (12) being located between and attached to adjacent column elements (7) and extending along the length direction (L).

2. The filter media support cage assembly of claim 1, wherein: The cage assembly is adapted to be included in a pulse filter media support structure, the cage assembly being configured to support a pulse filter media pack in a pulse filter cartridge.

3. The filter media support cage assembly according to claim 1 or 2, wherein: The cage assembly (1) is tapered so as to be narrower at the first end (2) than at the second end (3).

4. The filter media support cage assembly according to any one of claims 1 to 3, wherein: The column element (7) extends from the inner side (5) of the cage wall member to the outer side (6) of the cage wall member along the cross-wall direction (CW), and has a width (w7) in the cross-wall direction and a thickness (t7) in the cage circumferential direction, wherein the width (w7) is 1.5 to 50 times, preferably 2 to 25 times, and more preferably 3 to 10 times the thickness (t7).

5. The filter media support cage assembly according to any one of claims 1 to 4, wherein: The beam element (8) is located at the outer side of the cage wall member (4).

6. The filter media support cage assembly according to any one of claims 1 to 5, wherein: The column connecting sheet element (12) extends substantially along the length direction (L) and extends from the inner side (5) of the cage wall member to the outer side (6) of the cage wall member in the direction toward the first end (2), and wherein the column connecting sheet element (12) preferably has a length from the first edge (16) to the second edge (17) which is at least 4 times the thickness of the column connecting sheet element.

7. The filter media support cage assembly according to any one of claims 1 to 6, wherein: The post-connecting sheet element (12) includes a curved portion located proximate the first end (2) of the cage wall member so as to be configured to direct air flow through the cage during use of the filter cartridge.

8. The filter media support cage assembly according to any one of claims 1 to 7, wherein: The column connecting sheet element (12) has an angle of attack relative to the air flow radially entering the cage through the cage wall, the angle of attack being between 5° and 85°, the angle of attack being the angle between the radial direction of the cage and the straight line connecting the first edge (16) and the second edge (17) of the column connecting sheet element.

9. The filter media support cage assembly according to any one of claims 1 to 8, wherein: The beam element (8) is an integral part of the column connection sheet element (12) or is separate from the column connection sheet element (12).

10. The filter media support cage assembly according to any one of claims 1 to 9, wherein: The beam elements (8) extend in a cage circumferential direction substantially perpendicular to the length direction (L).

11. The filter media support cage assembly according to any one of claims 1 to 10, wherein: The cage wall member comprises one or more cross support sections (9) extending in the cage circumferential direction, and the cross support sections (9) comprise inclined cross support elements (10) extending between adjacent column elements.

12. The filter media support cage assembly according to any one of claims 1 to 11, wherein: The cage wall members are held together by one or more retaining rings (14).

13. The filter media support cage assembly according to any one of claims 1 to 12, wherein: The cage wall members (4) are configured to align or interlock with each other to form the cage.

14. The filter media support cage assembly according to any one of claims 1 to 13, wherein: All cage wall members (4) have substantially the same shape.

15. The filter media support cage assembly according to any one of claims 1 to 14, wherein: The cage assembly includes four cage wall members, which are preferably substantially planar.

16. The filter media support cage assembly according to any one of claims 1 to 15, wherein: One or more of the cage wall members includes two or more notches (14) located on the inner side of the cage wall member along a center line (C) extending in the length direction of the cage wall member.

17. The filter media support cage assembly of claim 16, wherein: The recess (14) is located in the column connecting section (11).

18. The filter media support cage assembly of any one of claims 1 to 17, wherein: The cage wall member is made of a corrosion-resistant material, preferably a plastic material or a polymer composite material.

19. The filter media support cage assembly of any one of claims 1 to 18, wherein: The cage wall member is a one-piece piece, preferably obtained by injection molding.

20. A filter media support structure (100) comprising a filter media support cage assembly (1) according to any one of claims 1 to 19, and a first end plate (21a, 21b) attached at a first end (20) of the cage assembly and a second end plate (22) attached at a second end (30) of the cage assembly, the first end plate being closed (21a) or having an opening (21b) for air to flow out of or into the interior volume (V) of the cage assembly, and the second end plate (22) having an opening for air to flow out of or into the interior volume (V) of the cage assembly, the filter media support structure preferably comprising one or more corner brackets (15) arranged in the opening of the second end plate (22).

21. A filter cartridge (110, 111) comprising the filter support structure (100) according to claim 20 and a filter medium pack (101), the filter cartridge being preferably a pulse filter cartridge.

22. An air filter device (120) comprising a filter cartridge according to claim 21, a mounting frame (131) and a filter cartridge abutment plate (134) comprising an air flow opening (133), wherein: The filter cartridge is fastened to the mounting frame so that the filter cartridge is located above the opening (133) and the second end plate (22) abuts against the filter cartridge abutment plate (134).

23. An air filtering device according to claim 22, comprising two filter cartridges (110, 111) according to claim 21 mounted on top of each other, wherein The first end plate (21b) of one filter cartridge (111) has an opening for air to flow out of or into the inner volume (V), and the other filter cartridge (110) has a closed first end plate (21a).

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