Filter core and filter cartridge

Abstract

A filter core is required that allows the fluid to spread easily to the edges of the filter media. [Solution] The solution is provided by a filter core disposed in the hollow portion of a filter medium that is formed in a cylindrical shape having a central axis and a hollow portion on its inner surface, wherein the filter core comprises a plurality of columnar members extending in the direction of the central axis of the filter medium, and beam members that are at least partly ring-shaped and support each of the plurality of columnar members between the filter medium and the plurality of columnar members, wherein the cross-section of each of the plurality of columnar members in a plane perpendicular to the direction of the central axis extends in a direction that does not pass through the central axis of the filter core from the joint point between each of the plurality of columnar members and the beam member.

Description

[Technical Field]

[0001] The present invention relates to a filter core that supports filter media and to a filter cartridge. [Background Art]

[0002] For example, as shown in FIGS. 5A and 5B, there is known a filter device in which a filter cartridge 101 is detachably mounted inside a filter container 100. A filter medium 102 is attached to the filter cartridge 101. FIG. 5B is a diagram showing the XX cross-section of FIG. 5A. Generally, in the case of small-sized devices, the filter cartridge 101 is fixedly attached to the filter container 100 without being intended for removal, and thus is called a filter element. On the other hand, in the case of large-sized devices, the filter cartridge 101 is detachably fixed to the filter container 100 and is replaced as needed, and thus is called a filter cartridge. In the present application, both of these are defined as filter cartridges. The filter cartridge 101 is defined as comprising at least a filter medium 102, a filter core 103, a first end plate 106, and a second end plate 107. Further, the filter core 103 is defined as a filter core for a filter that supports the filter medium 102 on an inner side thereof.

[0003] The filter media 102 is made of nonwoven fabric or a membrane, has a cylindrical shape with a hollow section inside, and is a component that has a filtering function for filtering the filter fluid. Its inside is supported by a filter core 103, and its top and bottom are supported by a first end plate 106 and a second end plate 107, respectively. Furthermore, the filter cartridge 101 may also include a cover 105 on the outside of the filter media 102 and between the first end plate 106 and the second end plate 107. Multiple core holes 103a are arranged on the circumferential surface of the filter core 103. In the configuration with a cover 105, multiple cover holes 105a are arranged on the outer circumference of the cover 105. The fluid FL1 before filtration enters the filter media 102 through multiple cover holes 105a on the outer circumference of the cover 105, passes through the filter media 102 and is filtered. The filtered fluid FL2 is introduced into the cylindrical hollow section 104 inside the core hole 103a and discharged from the core end 103b of the filter core 103. The first end plate 106 and the second end plate 107 support the filter media 102 and function to prevent the filtered fluid FL2 from mixing with the fluid FL1 before filtration. The filter cartridge 101 will be described in more detail below. Here, the filter media 102 will be described using a cylindrical shape as a representative example.

[0004] The filter cartridge 101, which is placed inside the filter container 100, has a cylindrical filter core 103 inside that is hollow and has a central axis. Numerous core holes 103a are arranged on the wall surface of the filter core 103 along the circumferential direction of the cross-section of the filter cartridge 101 and along the longitudinal direction of the hollow portion of the filter cartridge 103. In the filter cartridge 101, the filter core 103 is positioned in the hollow portion of the filter media 102, and the filter media 102 is structurally supported by the filter core 103. The filter media 102 is fixed to the first end plate 106 and the second end plate 107 by welding or the like. Furthermore, a cylindrical cover 105 may be placed on the outside of the outer circumference of the filter media 102.

[0005] The core hole 103a is a hole that allows fluid that has passed through the filter media 102 to be conducted to the cylindrical hollow portion 104 inside the filter core 103. A first end plate 106 and a second end plate 107 are positioned at both ends of the filter media 102, respectively. A cylindrical cover 105 may also be positioned on the outside of the filter media 102. The filter container 100 includes a first fluid port 100a and a second fluid port 100b. The first fluid port 100a communicates with the outer surface of the filter cartridge 101, and the second fluid port 100b communicates with the inside of the cylindrical hollow portion 104 of the filter core 103 of the filter cartridge 101.

[0006] For example, typically, the first fluid port 100a can be used as a fluid inlet and the second fluid port 100b as a fluid outlet. In this case, the fluid to be filtered is introduced into the filter container 100 from the first fluid port 100a, flows along the outside of the filter cartridge 101, passes upstream along the outer surface of the filter media 102 arranged in the filter cartridge 101, and reaches the cylindrical hollow portion 104 inside the filter core 103 downstream along the inner surface of the filter media 102, forming a flow where the fluid is discharged to the outside of the filter container 100 from the second fluid port 100b. Conversely, the second fluid port 100b can be used as a fluid inlet and the first fluid port 100a as a fluid outlet. In this case, the fluid to be filtered is first introduced from the second fluid port 100b into the cylindrical hollow portion 104 inside the filter core 103, passes upstream along the inner surface of the filter media 102 arranged in the filter cartridge 101, and forms a flow in which the fluid is discharged from the first fluid port 100a to the outside of the filter container 100 with the outer surface of the filter media 102 as the downstream. Hereinafter, in this specification, the former example will be described, in which the first fluid port 100a is a fluid inlet and the second fluid port 100b is a fluid outlet, based on the background of the invention and embodiments for carrying out the invention. However, even in the latter case, it is the same, only the direction of the flow is reversed. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2001-99775 [Overview of the project] [Problems that the invention aims to solve]

[0008] As disclosed in Patent Document 1, integrity testing for proper filtration requires that the filter media be thoroughly wetted with liquid.

[0009] For example, in integrity testing of filter media 102, such as membrane filters, a prerequisite is that the entire filter, including every corner of the filter media 102, is completely wetted. However, the decrease in wettability of the filter media 102 is concentrated in dead-end areas D at the edges of the filter media 102.

[0010] In other words, as shown in Figure 5B, fluid flows into the filter media 102 from the outer periphery and out from the inner surface of the filter to the filter core 103, which is the central flow path. In the flow FL of the filter cartridge 101, the flow FLu in the upper vertical direction of the filter media 102 has a longer flow distance, so the flow force is weaker than the flow FLb in the lower vertical direction of the filter media 102, and the flow rate of the flow FLb in the lower vertical direction of the filter media 102 is greater than the flow rate of the flow FLu in the upper vertical direction. As a result, a uniform flow throughout the filter media 102 cannot be achieved, and the fluid does not easily spread to the end 102a of the filter media 102. The decrease in wettability of the filter media 102 is concentrated at the dead end D on the end 102a side of the filter media 102, making it difficult to ensure complete wettability.

[0011] Regardless of whether a membrane film is used as the filter medium 102, a structure that allows fluid to easily spread to the dead end D at the end of the filter medium 102 (as shown in Figure 5B) is generally advantageous not only for diffusion testing but also for the filter medium 102 itself.

[0012] In other words, areas of the filter media 102 where the fluid flows well will capture more of the target organisms, while areas of the filter media 102 where the fluid does not flow well will capture fewer of the target organisms. The lifespan of the filter media 102 is determined by the areas where the target organisms are captured most, so it is necessary that the filtered fluid flows evenly and well throughout the entire filter media 102 and filter core 103. Furthermore, if the filtered fluid does not come into contact with the filter media 102 and filter core 103 for a long period of time, problems such as the growth of dirt and bacteria are likely to occur in the dry areas that are not in contact with the fluid.

[0013] However, the conventional filter core 103 did not have a structure that diffused the flow in the filter media 102. A structure with high wettability by the fluid is required, which allows the fluid to spread easily throughout the filter media 102 and the entire surface of the core to come into contact with the filtered fluid.

[0014] Furthermore, in order to reduce the difference in flow rate between the flow FLu at the top of the vertical direction and the flow FLb at the bottom of the vertical direction in the filter media 102, and to make the filter media 102 uniform, it is necessary to increase the flow rate of the fluid passing through the core holes 103a. To achieve this, it is necessary to make the size of the core holes 103a as large as possible and to increase the number of core holes 103a as much as possible.

[0015] However, increasing the size and number of core holes 103a leads to a decrease in the rigidity of the filter core 103. In other words, in the conventional structure of the filter core 103, increasing the flow rate of fluid into the hollow part inside the filter core 103 is in conflict with maintaining the rigidity of the filter core 103, and is therefore undesirable. A structure is needed that can maintain the rigidity of the filter core 103 even when the flow rate of fluid into the hollow part inside the filter core 103 is increased. [Means for solving the problem]

[0016] A filter core is provided to support the hollow portion of a filter medium, which is formed in the shape of a cylinder having a central axis and a hollow portion on its inner surface, wherein the filter core comprises a plurality of columnar members extending in the direction of the central axis of the filter medium, and beam members which are at least partly ring-shaped and support each of the plurality of columnar members between the filter medium and the plurality of columnar members, and each of the plurality of columnar members has a cross-sectional shape in a plane perpendicular to the direction of the central axis that extends from the joint point between each of the plurality of columnar members and the beam member in a direction that does not pass through the central axis of the filter core.

[0017] The problem is solved by a filter cartridge comprising: a filter medium formed in a cylindrical shape having a central axis and a hollow portion on its inner surface; and a filter core disposed in the hollow portion of the filter medium so as to support the hollow portion of the filter medium, wherein the filter core comprises a plurality of columnar members extending in the direction of the central axis of the filter medium; and beam members that are at least partly ring-shaped and support each of the plurality of columnar members between the filter medium and the plurality of columnar members, wherein the cross-section of each of the plurality of columnar members in a plane perpendicular to the direction of the central axis extends from the joint point between each of the plurality of columnar members and the beam member in a direction not passing through the central axis of the filter core. [Effects of the Invention]

[0018] The present invention makes it possible to realize a filter core in which the fluid can easily spread throughout the filter media of the filter cartridge, and the entire surface of the core can easily come into contact with the filtered fluid. [Brief explanation of the drawing]

[0019] [Figure 1A] This is a perspective view of the filter core 1 and the filter cartridge 2, and an exploded view of the filter media 13. [Figure 1B] It is a view showing the filter core 1 and the filter cartridge 2 viewed from arrow B in FIG. 1A, and shows an example of the configuration of the column member 11 and the beam member 12. [Figure 1C] It is a view showing the filter core 1 and the filter cartridge 2 viewed from arrow A in FIG. 1A, and shows an example of the configuration of the column member 11 and the beam member 12. [Figure 1D] It is a view showing the filter core 1 and the filter cartridge 2 viewed from arrow A in FIG. 1A, and shows an example of the configuration of the column member 11 and the beam member 12. [Figure 1E] It is a view showing the cross-sectional shape of the column member. [Figure 1F] It is a view showing the filter core 1 and the filter cartridge 2 viewed from arrow A in FIG. 1A, and shows an example of the configuration of the column member 11 and the beam member 12. [Figure 1G] It is a view showing the filter core 1 and the filter cartridge 2 viewed from arrow A in FIG. 1A, and shows an example of the configuration of the column member 11 and the beam member 12. [Figure 1H] It is a view showing the filter core 1 and the filter cartridge 2 viewed from arrow A in FIG. 1A, and shows an example of the configuration of the column member 11 and the beam member 12. [Figure 1I] It is a view showing the filter core 1 and the filter cartridge 2 viewed from arrow A in FIG. 1A, and shows an example of the configuration of the column member 11 and the beam member 12. [Figure 2] It is a view showing the filter core 1 and the filter cartridge 2 viewed from arrow A in FIG. 1A, and shows an example of the configuration of the curved beam member 12 whose cross section forms a part of an annular shape. [Figure 3] It is a view showing a configuration using an inclined beam member for the filter core 1 and the filter cartridge 2. [Figure 4A] It is a perspective view showing a configuration using a spiral beam member for the filter core 1 and the filter cartridge 2. [Figure 4B] This is a side view showing the configuration of the filter core 1 and filter cartridge 2 using a spiral-shaped beam member. [Figure 5A] This diagram illustrates a typical configuration of the filter core 1 and filter cartridge 2. [Figure 5B] This diagram illustrates a typical configuration of the filter core 1 and filter cartridge 2. [Modes for carrying out the invention]

[0020] [Embodiment 1] The filter core 1 and filter cartridge 2 will be described with reference to Figures 1A and 1C. Figure 1A is a perspective view of the filter core 1 and filter cartridge 2, showing the filter media 13 in an exploded view. Figure 1B is a side view of the filter core 1 as seen from arrow B in Figure 1A. In Figure 1B, the filter media 13 is shown in cross-section so that the filter core 1 is easily visible. Figures 1C to 1I are cross-sectional views of the filter core 1 and filter cartridge 2 as seen from arrow A in Figure 1A.

[0021] As already explained in the background of the invention, the filter core 1 of the present invention shown in Figures 1A to 1C is arranged as part of the inside of the filter cartridge 2 which is built into the filter container 100, which is a filter device.

[0022] The filter core 1 comprises a column member 11 and a beam member 12. The filter cartridge 2 comprises the filter core 1, filter media 13, and end plates 14 and 15. The filter media 13 is positioned outside the filter core 1. The column member 11 and the beam member 12 are typically made of resin. The filter media 13 is formed in a cylindrical shape with a central axis CL and a hollow portion 13a on its inner surface. Hereinafter, with respect to the column member 11 and the beam member 12, the side of the filter media 13 closer to the central axis CL when the filter media 13 is attached is defined as the inside of the column member 11 or beam member 12, and the side of the filter media 13 closer to the inner surface is defined as the outside of the column member 11 or beam member 12.

[0023] A filter core 1 is placed in the hollow portion of the filter media 13, and the filter core 1 supports the filter media 13. In the following description of the filter core 1, column member 11, and beam member 12, the central axis CL of the filter media 13 will be referred to as a reference as necessary when the filter media 13 is attached to the filter core 1. The filter core 1 and the filter media 13 are supported at both ends in the direction of the central axis CL of the filter media 13 by end plates 14 and 15. For example, typically, the filter core 1 and the filter media 13 are fixed at both ends to the end plates 14 and 15 by heat welding. A hole 14a is provided in the end plate 14, and the hole 14a functions as a flow channel hole that communicates with the center of the filter core 1. At least a part or all of the filter core 1 is joined to the end plate 14 at the portion of the hole 14a in the end plate 14. In the following description, the filter media 13 will be described as a cylindrical shape with a circular cross-section as a typical example of a cylindrical shape. However, it is not limited to a cylindrical shape with a circular cross-section. Here, if the cross-section of the filter media 13 is not circular, the center is a point that can be used as a substitute for the center. For example, in the cross-section of the filter media 13, the central axis CL may be the centroid or center of gravity assuming it is a uniform material. Also, if the cross-section of the filter media 13 is elliptical, it can be the center of the ellipse. If the cross-section of the filter media 13 is a polygonal cylindrical shape, the center can be the intersection point of the polygon.

[0024] The filter core 1 includes one or more columnar members 11 that extend in the longitudinal direction of the filter media 13 along the central axis CL of the filter media 13. There may be one columnar member 11, or there may be two or more columnar members 111, 112, 113, ... In Embodiment 1, the number of columnar members is six, and the example of columnar members 111, 112, 113, 114, 115, 116 will be explained.

[0025] The beam member 12 is positioned outside the column member 11, surrounding it when viewed from the central axis CL of the filter media 13. The column member 11 supports and fixes the beam member 12. The beam member 12 forms a complete ring shape or is part of a ring shape. There may be one beam member 12, but typically there are multiple beam members 12. The beam member 12 consists of multiple ring-shaped beam members, and each of the multiple beam members 12 is arranged in a line along the direction in which the column member 11 extends. The inner surface of each of the multiple beam members 12 is fixed and supported by the column member 11. The spacing between adjacent beam members 12 forms a flow path inside the filter media 13 that promotes the circumferential flow of the filter media. Each of the multiple beam members 12 may be arranged at a constant equal interval, or at different intervals. The spacing between each of the multiple beam members 12 aligned with the central axis CL of the filter media 13 becomes the cross-sectional area of ​​the flow path, so the spacing can be freely set as needed, such as for flow rate control. The column member 11 and the beam member 12 are joined by welding or adhesive. Alternatively, the joining may be done by integral molding with resin.

[0026] The column members 11 and beam members 12 can take various forms. For example, each of the column members 111, 112, 113, 114, 115, and 116 is arranged to extend longitudinally along the central axis CL of the filter media 13. In a plane perpendicular to the direction along the central axis CL, the cross-sections of each of the column members 111, 112, 113, 114, 115, and 116 are shaped to extend from the joint point between each of the column members 111, 112, 113, 114, 115, and 116 and the beam member 12 (outside the column member 11) toward the center of the filter core 1 (inside the column member 11) in a direction that does not pass through the central axis CL of the filter core 1. Here, if the cross-section of the filter media 13 is not circular, a point that can substitute for the center is used as the center. For example, in the cross-section of the filter media 13, the central axis CL(O) may be the centroid or center of gravity assuming a uniform material. If the cross-section of the filter media 13 is elliptical, the center can be the intersection of the major and minor axes of the ellipse. If the cross-section of the filter media 13 is a polygonal cylinder, the center can be the intersection of the diagonals of the polygon.

[0027] For example, as seen in Figure 1C, the orientation of the cross-section of the column member 111 in a plane perpendicular to the direction along the central axis CL, with respect to the imaginary line L connecting the joint point P between the column member 111 and the beam member 12 (outside the column member 11) and the center of the filter core 1 (inside the column member 11), which is the central axis CL (point O), forms a non-zero angle α (≠0). That is, in a plane perpendicular to the direction along the central axis CL, the orientation of the cross-section of the column member 111 with respect to the joint point P between the column member 111 and the beam member 12 does not coincide with the imaginary line L connecting the joint point P between the column member 111 and the beam member 12 (outside the column member 11) and the center of the filter core 1 (inside the column member 11), which is the central axis CL (point O), and extends in a direction that is at an angle to the imaginary line L.

[0028] Furthermore, it is preferable that the cross-sectional shapes of each column member 111, 112, 113, 114, 115, and 116 be the same shape at predetermined central angles around the central axis CL. For example, column member 112 has the same shape as column member 111 when rotated by a central angle of 60 degrees around the central axis CL. That is, adjacent column members have the same shape when rotated by the same predetermined central angle around the central axis CL. The same relationship holds true for the other column members 111, 112, 113, 114, 115, and 116.

[0029] Each of the column members 11 (111, 112, 113, 114, 115, 116) forms a gap 4 between itself and the adjacent column member. This gap 4 functions as a flow path that stimulates fluid flow from the outside of the filter media 13 towards the inside of the beam member 12, or vice versa, when the filter media 13 is arranged circumferentially on the outside of the beam member 12. Furthermore, the orientation of the cross-section of column member 111 extends from the outside of column member 11 towards the inside of column member 11, in a direction that does not pass through the central axis CL(O), which is the center of the filter core 1. Therefore, the flow path defined by the gap 4 has the effect of causing the fluid to swirl around the central axis CL(O), which is the center of the filter core 1. As a result, fluid agitation is promoted inside the filter core 1, and consequently inside the filter media 13 and the filter container, resulting in the effect of evenly wetting the entire filter media 13 with fluid.

[0030] The number of column members 11 does not matter as long as there are two or more, and the cross-section of each column member 11 extends from the joint point between each column member 111, 112, 113, 114, 115, 116 and the beam member 12 (outside the column member 11) toward the center of the filter core 1 (inside the column member 11) in a direction that does not pass through the central axis CL of the filter core 1, and a gap 4 can be formed between adjacent column members 11. For example, as shown in Figures 1D and 1F, there can be eight column members 111, 112, 113, 114, 115, 116, 117, 118, or as shown in Figure 1E, there can be two column members 111, 112.

[0031] The cross-sectional shape of the column member 111 in a plane perpendicular to the direction along the central axis CL can take on various forms. Figures 1A to 1D show examples where the cross-sectional shape of the column member 111 in a plane perpendicular to the direction along the central axis CL is rectangular. That is, in the cross-sectional shape of the column member 111 in a plane perpendicular to the direction along the central axis CL, the cross-section can be configured such that at least a part of the contour has straight lines. This contour consisting of straight lines becomes a plane in the direction along the central axis CL of the column member 111.

[0032] Furthermore, as shown in Figure 1F, it is preferable that the cross-sectional shape of the column member 11 be such that the inner width t2 of the cross-section of the column member 11 is smaller than the outer width t1 of the cross-section of the column member 11. The side of the filter media 13 with its central axis CL (the inside of the column member 11) tends to have worse fluid wettability over time than the side closer to the filter media 13 (the outside of the column member 11). Therefore, it is advantageous to make the inner width t2 of the cross-section of the column member 11 as small as possible to reduce the area in contact with the fluid. Furthermore, the inner width t2 of the cross-section of the column member 11 can also be set to zero, i.e., to have a pointed shape. In addition, the outer cross-sectional shape of the column member 11 can be made into a curved surface. This makes it possible to improve liquid wettability over the entire area, both inside and outside, of the column member 11.

[0033] Furthermore, in the shape of the cross-section of the column member 111 in a plane perpendicular to the direction along the central axis CL, at least a portion of the contour of the cross-section can be configured to have a curve. For example, in Figure 1G, the contours 111a and 111b of column member 111 and the contours 112a and 112b of column member 112 can be configured with curves. These curved contours become curved surfaces in the direction along the central axis CL of column member 111.

[0034] Then, in the column member 111 and the adjacent column member 112, a gap 4 is formed between the contour 111a of column member 111 and the contour 112b of column member 112, and this gap functions as a flow path. By configuring the shape of the cross-section of the column member 111 in a plane perpendicular to the direction along the central axis CL as a straight line or a curve, the rate of change of the size of the gap 4 as a flow path with respect to the distance from the central axis CL can be controlled to an optimal shape.

[0035] Furthermore, the angle α between the imaginary line L connecting the joint point p between the column member 111 and the beam member 12 and the central axis CL (point O), and the orientation of the cross-section of the column member 111 in a plane perpendicular to the direction along the central axis CL, can be changed within a non-zero range.

[0036] For example, as shown in Figure 1H, increasing α results in a gap 4 that acts as a flow channel, closer to the circumferential direction around the central axis CL. On the other hand, as shown in Figure 1I, decreasing α results in a gap 4 that acts as a flow channel, closer to the direction toward the central axis CL.

[0037] The configuration of this column member 11 makes it possible to facilitate the spread of fluid throughout the filter media 13 of the filter cartridge 2 in the filter core 1, and more specifically, to promote the flow of the filter media 13 around the central axis CL.

[0038] The filter core 1 comprises beam members 12 that form a complete ring shape, or beam members 12 that form part of a ring shape. The beam members 12 may form a complete ring. There may be one beam member 12, but typically there are multiple beam members 12. The spacing between adjacent beam members 12 forms a flow channel within the filter media 13 that promotes flow in the circumferential direction.

[0039] Then, multiple beam members 12 are arranged along the central axis CL of the filter media 13, and the column members 11 and beam members 12 are joined together. The joining can be done by welding or adhesive.

[0040] In the examples shown in Figures 1A to 1I, the beam member 12 is shown to form a complete ring shape. However, as shown in Figure 2, the cross-section may be a curved shape that forms part of a ring shape (a curved shape with a discontinuous portion in a part of the complete ring cross-section). Furthermore, the beam member 12 may have a curved shape that is not ring-shaped in cross-section, and it is sufficient that at least a part of the cross-section has a curved shape.

[0041] Furthermore, as shown in Figure 3, the beam member 12 can be formed to have an inclination away from the position where it contacts the column member 11. This allows for the formation of a flow channel that promotes flow in the circumferential direction, and since this flow channel is inclined in the direction of the central axis CL of the filter media 13, it can promote flow in the direction of the central axis CL of the filter media 13 and in the circumferential direction.

[0042] Furthermore, in terms of the technical significance of the beam member 12 forming a complete ring shape, the complete ring shape may be a helical shape which is completed by the adjacent beam member 12. That is, as shown in Figures 4A and 4B, the beam member 12 can be a helical beam member which forms a helical shape inclined around the central axis CL of the filter media 13. Figure 4A is a perspective view of a portion of the filter core 1, showing the filter media 13 separated from the filter core 1. Figure 4B is a side view of the filter core 1 as seen from arrow B in Figure 1A. In Figure 4B, the filter core 1 is installed, and the filter media 13 is shown as a cross-section so that the filter core 1 is easily visible. Although Figures 4A and 4B show one helical beam member 12, the helical beam member 12 can also be two or more helical beam members 12. That is, one or more beam members 12 can be selected as the helical beam member 12. One or more helical beam members 12 can form a flow path inside the filter media 13 between adjacent beam members 12. One or more helical beam members 12 can promote the circumferential flow of the filter media 13, and also promote the flow of the filter media 13 in the direction of the central axis CL and in the circumferential direction. In this case as well, the spacing between adjacent beam members 12 of the multiple helical beam members 12 forms a liquid flow path along the helical shape. In this configuration as well, each of the multiple helical beam members 12 may be arranged at a constant equal interval, or at different intervals. The spacing between the multiple beam members 12 becomes the cross-sectional area of ​​the flow path, so the spacing can be freely set as needed, such as for flow rate control. The helical beam members 12 have the effect of promoting the longitudinal flow of fluid in the filter media 13.

[0043] The various forms of the beam member 12 described above can be applied to any of the various forms of the column member 11 described above. That is, it is applicable not only to the forms of the column member 11 shown in Figures 1A to 1I, but also to all of the above forms. As a result, the column member 11 promotes the circumferential flow of the filter media 13, and the beam member 12 also promotes the flow of the filter media 13 along the longitudinal direction of the filter media 13 along the central axis CL of the filter media 13.

[0044] The filter core 1 and filter cartridge 2 of the present invention provide a structure with high wettability, enabling the filter media 13 and filter core 1 to be sufficiently wetted with fluid even with a small amount of filtration fluid and short-term flow. Furthermore, it suppresses uneven flow of the filtration fluid to specific areas of the filter media 13, thereby extending the filter life. Even if the inside of the filter core 1 is not completely filled with water, the front and back surfaces of the beam member and column member are more easily brought into contact with the filtration fluid, thus reducing contamination that occurs in dry areas where the fluid does not come into contact with the filter media 13, filter core 1, beam member 12, and column member 11. [Explanation of Symbols]

[0045] 1 filter core 2 filter cartridges 4 gaps 11 Column members 12 Beam members 13 Filter Media 100 filter containers 101 Filter Cartridge 102 Filter Media 103 filter cores 104 Cylinder hollow section 105 Cover 106 First End Plate 107 Second End Plate 111 Column members 112 Column members 113 Column members 114 Column members 115 Column Material 116 Column Material 117 Column Material 118 Column Material

Claims

1. A filter core is disposed in the hollow portion of a filter medium so as to support the hollow portion of a filter medium that is formed in a cylindrical shape having a central axis and a hollow portion on its inner surface, wherein the filter core is A plurality of columnar members extending in the direction of the central axis of the filter media, The filter media and the plurality of column members are at least partially ring-shaped, and each of the plurality of column members is supported by a beam member between the plurality of column members, Each of the plurality of column members is a filter core in which the cross-section of each of the plurality of column members in a plane perpendicular to the direction of the central axis extends from the joint point between each of the plurality of column members and the beam member in a direction that does not pass through the central axis of the filter core.

2. A filter core according to claim 1, The beam member consists of a plurality of beam members, at least a portion of which is ring-shaped. A filter core in which each of the plurality of beam members is arranged in a line along the direction in which the column member extends, and the inner surface of each of the plurality of beam members is fixed to the column member.

3. A filter core according to claim 1, Each of the aforementioned column members forms a gap between itself and an adjacent column member. The filter core is such that the cross-sectional shape of each of the plurality of column members is the same at predetermined central angles around the central axis.

4. A filter core according to claim 1, In each of the plurality of column members, the contour of the cross-section of each of the plurality of column members is a curved filter core.

5. A filter core according to claim 1, The filter core is characterized in that the cross-sectional shape of the column member is such that the inner width of the column member is smaller than the outer width of the column member.

6. A filter core according to any one of claims 1 to 5, The ring-shaped form of the beam member is a filter core having an inclination with respect to a plane perpendicular to the central axis of the filter media.

7. A filter core according to any one of claims 1 to 5, The beam member is a filter core which is one or more spiral-shaped beam members aligned with the direction in which the column member extends.

8. A filter core according to claim 7, The aforementioned spiral-shaped beam member is a filter core in which the spiral-shaped beam member is fixed to the column member.

9. A filter media formed in a cylindrical shape having a central axis and a hollow portion on its inner surface, A filter cartridge comprising: a filter core disposed in the hollow portion of the filter media so as to support the hollow portion of the filter media, The aforementioned filter core is A plurality of columnar members extending in the direction of the central axis of the filter media, The filter media and the plurality of column members are at least partially ring-shaped, and each of the plurality of column members is supported by a beam member between the plurality of column members, A filter cartridge in which each of the plurality of column members has a cross-sectional shape in a plane perpendicular to the direction of the central axis such that the cross-section of each of the plurality of column members extends from the joint point between each of the plurality of column members and the beam member in a direction that does not pass through the central axis of the filter core.

10. A filter cartridge according to claim 9, The aforementioned beam member consists of multiple beam members, each of which is ring-shaped. A filter cartridge in which each of the plurality of beam members is arranged in a line along the direction in which the column member extends, and the inner surface of each of the plurality of beam members is fixed to the column member.

11. A filter cartridge according to claim 9, Each of the aforementioned column members forms a gap between itself and an adjacent column member. A filter cartridge in which the cross-sectional shape of each of the plurality of column members is the same at predetermined central angles around the central axis.

12. A filter cartridge according to claim 9, A filter cartridge in which each of the plurality of column members has a curved contour of the cross-section of each of the plurality of column members.

13. A filter cartridge according to claim 9, A filter cartridge characterized in that the cross-sectional shape of the column member is such that the inner width of the column member is smaller than the outer width of the column member.

14. A filter cartridge according to any one of claims 9 to 13, The ring-shaped form of the beam member is a filter cartridge having an inclination with respect to a plane perpendicular to the central axis of the filter media.

15. A filter cartridge according to any one of claims 9 to 13, The beam member is a filter cartridge comprising one or more spiral-shaped beam members aligned in the direction in which the column member extends.

16. A filter cartridge according to claim 15, The aforementioned spiral-shaped beam member is a filter cartridge in which the spiral-shaped beam member is fixed to the column member.

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