Filter with gasket

Abstract

To provide a filter with gasket that can suppress turbulent flow of a fluid flowing in a flow channel, and can reduce pressure loss.SOLUTION: A filter 1 with gasket, which is installed between two members (11, 12) comprising a flow channel 10 and collects impurities, comprises: a mesh part 2 comprising a conical net-like body 20 which narrows toward a downstream side from an upstream side in a flow direction 5 of a fluid flowing in the flow channel; an annular ring part 3 comprising a metal 30 which holds the upstream side of the mesh part; and a gasket part 4 comprising an elastic body 40 which seals between the two members. The ring part has: a bent part 32 which is folded in such a manner that an inner side thereof is bent outward, and constitutes an introduction port 1a for the fluid; and an outward flange part 31 which is continuous with the bent part, and is sandwiched between the two members.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a gasketed filter that is installed between two members having a flow path and collects impurities contained in a fluid flowing through the flow path. [Background technology]

[0002] Examples of such gasketed filters include Patent Document 1 and Patent Document 2. Patent Document 1 discloses a filter gasket made of polyamide resin material, which includes a disk-shaped net portion, an annular flange portion surrounding the outer periphery of the net portion, and an annular gasket made of a rubber-like elastic material formed integrally with the flange portion. Patent Document 2 discloses a filter gasket which includes a metal filter, an elastic gasket provided on the outer periphery of the filter, a resin annular member provided integrally with the inner periphery of the gasket, and a resin fixed member fixed to the annular member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-245798 A [Patent Document 2] JP 2018-091352 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, one of the challenges of such filters is to suppress the turbulence of the fluid passing through the filter and to minimize the pressure loss of the fluid flowing through the flow path. However, the filter disclosed in the above Patent Document 1 has an annular flange portion surrounding the outer periphery of the net portion and is disposed so as to protrude in a direction substantially perpendicular to the flow direction of the flow path, and is not configured to suppress the pressure loss. In addition, the filter disclosed in the above Patent Document 2 has a metal filter disposed in an exposed state at the fluid inlet, and does not take into consideration the suppression of turbulence of the fluid, and is not configured to suppress the pressure loss of the fluid.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a gasketed filter that can suppress turbulence of a fluid flowing through a flow path and reduce pressure loss. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the gasketed filter of the present invention is a filter that is mounted between two components having a flow path and collects impurities contained in the fluid flowing through the flow path, and comprises a mesh portion consisting of a cone-shaped mesh body that narrows from the upstream side to the downstream side in the flow direction of the fluid flowing through the flow path, an annular ring portion consisting of a metal material that holds the upstream side of the mesh portion, and a gasket portion consisting of an elastic material that seals between the two components, and the ring portion has a curved portion that is formed by bending the inside outward and forms an inlet for the fluid, and an outward flange portion that is connected to the curved portion and is sandwiched between the two components.

[0007] The following description of the embodiments will disclose that the gasketed filter according to the present invention may include the following subsidiary configurations. <Configuration 2> In the above, the mesh portion has a flange-shaped portion made of a metal material and held in the ring portion, and is formed by bending it outward, and the outward flange portion may have a folded portion that clamps the flange-shaped portion from both the front and back sides and is formed by bending it inward by crimping. <Configuration 3> In the above, the gasket portion may be made of ultraviolet-curing liquid rubber and may be disposed on a downstream surface of the outward flange portion. <Configuration 4> In the above, the mesh portion may have an apex that protrudes most in the direction of flow of the fluid and a pleated portion having a plurality of folds with creases extending toward the apex, and the pleated portion and the apex may be formed from the mesh body. <Component 5> In the above, the mesh portion may have a conical shape obtained by pleating the circular net-like body. Effect of the Invention

[0008] Since the gasketed filter of the present invention has the above-mentioned configuration, it is possible to suppress turbulence of the fluid flowing through the flow passage and reduce pressure loss. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1(a) and (b) are cross-sectional views showing an example of a gasketed filter according to an embodiment of the present invention, where (a) is a view showing the process of assembling the filter between two members, and (b) is a view showing the filter in the assembled state between the two members. [Diagram 2] 1(a) is an enlarged view of part A in FIG. 1(a), and (b) is an enlarged view of part B in FIG. 1(b). [Diagram 3] 1A is a schematic diagram for explaining a manufacturing process of a ring portion constituting the gasketed filter according to the embodiment, in which (a) is a plan view showing a metal material before a metal material punching step, (b) is a plan view showing a metal material after the metal material punching step, (c) is a perspective view showing a metal material punched in the metal material punching step, and (d) is a cross-sectional perspective view showing a ring portion obtained through a bending process. [Figure 4]Schematic diagrams for explaining the members constituting the gasketed filter according to the embodiment and the manufacturing process, where (a) is a plan view showing the wire mesh before the wire mesh punching process, (b) is a plan view showing the wire mesh after the wire mesh punching process, (c) is a perspective view showing the mesh part obtained through the mesh part forming process, (d) is a perspective view showing the ring part obtained through the ring part forming process, and (e) is a perspective view showing the filter (before the liquid rubber coating process) obtained through the integrated processing process. [Diagram 5] FIG. 2 is a perspective view that illustrates a schematic example of a molding die for molding a mesh portion of the gasketed filter according to the embodiment. [Figure 6] 4 is a flowchart illustrating a manufacturing process of the gasketed filter according to the embodiment. [Figure 7] Photographs of filters used when testing the relationship between the shape of the filter inlet and pressure loss. (a) is a photograph of the filter used as a comparative example taken from two directions, and (b) is a photograph of the filter used as an example taken from two directions. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that in some drawings, some of the detailed reference numerals attached to other drawings are omitted.

[0011] The gasketed filter 1 according to this embodiment is a filter that is installed between two members 11 and 12 having a flow path 10 and captures impurities contained in the fluid flowing through the flow path. It includes a mesh part 2 made of a cone-shaped mesh body 20 that narrows from the upstream side to the downstream side in the flow direction 5 of the fluid flowing through the flow path 10, an annular ring part 3 made of a metal material 30 that holds the upstream side of the mesh part 2, and a gasket part 4 made of an elastic body 40 that seals between the two members 11 and 12. The ring part 3 has a curved part 32 that is formed by bending the inside outward and that constitutes the inlet 1a for the fluid, and an outward flange part 31 that is connected to the curved part 32 and is sandwiched between the two members 11 and 12. A detailed description will be given below.

[0012] First, the gasketed filter 1 according to this embodiment will be described with reference to Figs. 1 to 4. The gasketed filter 1 shown in these figures is a filter applied to a fuel cell air filter for vehicles as one application example. The gasketed filter 1 is attached to a joint between a first member 11 and a second member 12 that constitute a hollow cylindrical pipe. The joint between the first member 11 and the second member 12 has an attachment groove 11a in which the gasketed filter 1 is attached, and a flat surface 11b. On the other hand, the joint between the second member 12 and the first member 11 is a flat surface 12a. Therefore, when the first member 11 and the second member 12 are opposed to each other at their joint portions, the flat surfaces 11b and 12a are butted against each other, and a space is formed between the attachment groove 11a and the flat surface 12a (see Fig. 2(b)). The gasketed filter 1 is mounted in a space formed between the mounting groove 11a and the flat surface 12a with the outward flange 31 of the ring portion 3 and the gasket portion 4 sandwiched between them. A large volume of intake air flows as a fluid within the piping formed by the first member 11 and the second member 12, and the gasketed filter 1 captures foreign matter such as dust and dirt contained in the air flowing within the piping.

[0013] The gasketed filter 1 comprises a mesh portion 2 made of a cone-shaped mesh body 20, an annular ring portion 3 that holds the upstream side of the mesh portion 2, and a gasket portion 4 made of an elastic body 40 that seals between a first member 11 and a second member 12. When mounting the gasketed filter 1, the ring portion 3 is mounted so as to be located upstream of the mesh portion 2, as shown in Fig. 1(b).

[0014] The mesh portion 2 is formed into a cone shape by pleating a circular mesh body 20 made of a metal material (specifically, stainless steel or brass), and includes an apex 21, pleats 22, and a flanged portion 23. The apex 21 is the portion that protrudes most in the fluid flow direction 5, and is formed in a bowl shape without any creases. The pleats 22 have a plurality of folds 22a and a plurality of gusset portions 22b, and the folds 22a are provided with folds that extend along the fluid flow direction 5 and toward the apex 21. The number of folds 22a and gusset portions 22b provided in the pleats 22 is set according to the inner diameter dimension of the pipe to be installed, and the number of folds 22a that constitute the pleats 22 is not limited. The width of the pleats 22a is gradually narrowed (reduced) from the upstream side toward the apex 21, and the pleats are formed to have a uniform width, and the side shape of the pleats 22 is formed to be substantially triangular. As shown in Figures 2(b) and 4(c), the flange-shaped portion 23 has an outwardly curved portion 23b formed by bending the outer periphery of the mesh portion 2 outward. This outwardly curved portion 23b is curved so as to follow the curved portion 32 of the ring portion 3 when held by the ring portion 3 described below.

[0015] According to the above configuration, the cone-shaped mesh portion 2 allows the collected foreign matter to be concentrated at the top 21. In addition, the mesh portion 2 is made of wire mesh and is pleated, so that strength can be ensured. Furthermore, the mesh portion 2 is made of a cone-shaped circular wire mesh that is pleated, so that it can be made seamless without any welded or bonded parts, and pressure loss in the mesh portion 2 can be reduced. In addition, if a circular wire mesh is not pleated evenly as in this embodiment and is squeezed into a cone shape, many overlapping parts (wrinkles) are generated in the wire mesh, which results in a reduced filtration area and increases the pressure loss. However, the gasketed filter 1 of this embodiment has pleats 22 that are evenly provided by a molding die described later, so that the filtration area can be increased and the pressure loss can be reduced.

[0016] The ring portion 3 is an annular member made of a metal material (specifically, stainless steel or brass), and has a curved portion 32 and an outward flange portion 31. The curved portion 32 is formed by bending the inner diameter side 30b (inner side) of the annular member outwardly and forms the inlet 1a for the fluid. Specifically, as shown in Fig. 3(c) and Fig. 3(d), the curved portion 32 is formed by bending the inner diameter side 30b of a flat annular plate-like metal material 30 so that the bending angle is wider from the inside to the outside direction (outward). The degree of bending of the curved portion 32 is not particularly limited, but for example, bending the curved portion 32 to about R2 to R3 is effective in reducing the pressure loss of the fluid passing through the gasketed filter 1. This was made clear by the test results described later, and will be described in detail later with reference to Fig. 7. The outward flange portion 31 has a folded portion 31a and a flat portion 31b to hold the flange portion 23 of the mesh portion 2 from both sides (both the upstream side and the downstream side). Specifically, after the curved portion 32 is curved, the outer diameter side 30a of the metal material 30 is folded inward (see the outlined arrow D1 in FIG. 3(d)) by crimping to form the folded portion 31a. At this time, as shown in FIG. 2(b), the outer peripheral end 31aa of the folded portion 31a is folded so that it is located at the starting position of the flat portion 31b that forms a flat surface from the curved portion 32 (the ending position of the curved portion 32). Then, the entire flange portion 23 of the mesh portion 2 is not held by the outward flange portion 31, and the ring portion 3 that holds the flange portion 23 of the mesh portion 2 can be formed while securing the area where the gasket portion 4 is arranged. This point will also be described in detail later.

[0017] According to the above configuration, the outer peripheral end 23a (also the end 2a of the mesh part 2; see FIG. 4(b)) of the flange part 23 of the mesh part 2 is crimped while being clamped by the outward flange part 31 of the ring part 3, so that the outer peripheral end 23a of the flange part 23 of the mesh body can be firmly integrated with the ring part 3 without fraying. In addition, in the above configuration, the inner side of the annular ring part 3 that holds the upstream side of the mesh part 2 has a curved part 32 that is curved and folded outward, for example, at about R2 to R3, and forms the inlet 1a for the fluid. Therefore, the mesh part 2 of the mesh body 20 is not exposed at the inlet 1a for the fluid, and the effects arising from the configuration of the mesh part 2 described above are synergistic, suppressing the turbulence of the fluid flowing through the flow path 10, and further reducing the pressure loss.

[0018] The gasket portion 4 is made of an elastic body 40 such as rubber. The gasket portion 4 may be inserted into the flange portion 23 from the outer peripheral end 23a side by insert molding or by a method of inserting a gasket having a substantially U-shaped cross section. Alternatively, the gasket portion 4 may be made of liquid rubber (a so-called liquid gasket (CIPG: Cured In Place Gasket)). Examples of liquid rubber that can be used here include ultraviolet-curable low-siloxane silicone rubber, thermal addition liquid fluororubber, and liquid EPDM. In particular, if the gasket portion 4 is ultraviolet-curable liquid rubber, the liquid rubber application process (see FIG. 6, S106 and FIG. 4(b)) and the ultraviolet irradiation process (FIG. 6, S107) can be easily automated by a robot or device. If the gasket portion 4 has a bulge that generates a tightening margin as shown by the two-dot chain line in FIG. 2(b), the gasket portion 4 can provide a good seal between the joint portions of the first member 11 and the second member 12 when the gasket portion 4 is attached between the first member 11 and the second member 12.

[0019] According to the above configuration, since the gasket portion 4 is made of liquid rubber, when the liquid rubber is applied to the downstream surface of the outward flange portion 31, the liquid rubber penetrates into the net-like body 20 of the mesh portion 2 held by the ring portion 3, and is firmly bonded to the ring portion 3. In particular, since the liquid rubber is literally a liquid, even if the outward curved portion 23b and the downstream surface 32a of the curved portion 32, which are the application surfaces, are uneven, the liquid rubber penetrates and hardens to provide high adhesion, which is preferable, and fraying of the end 2a of the mesh portion 2 made of the net-like body 20 can be prevented. In addition, when applying the liquid rubber, the curved portion 32 of the ring portion 3 formed by bending and curving blocks the liquid flow, so that the liquid rubber can be prevented from leaking from the downstream surface 32a of the curved portion 32 to the upstream surface. In the gasketed filter 1 configured as described above, in the attached state (see FIG. 2(b)), the gasket portion 4 made of the elastic body 40 elastically contacts the flat surface 12a of the second member 12 with a tightening margin, and also elastically contacts the side surface 11ab of the mounting groove 11a. Furthermore, the outward flange portion 31 of the ring portion 3 made of the metal material 30 abuts against the bottom surface 11aa of the mounting groove 11a of the first member 11. This allows the gasketed filter 1 to be firmly attached to the mounting groove 11a while preventing fluid leakage between the first member 11 and the second member 12, specifically from the butted portion of the flat surfaces 11b, 12a.

[0020] Next, referring to Figs. 3 to 6, a molding method for manufacturing the gasketed filter 1 according to this embodiment will be described. The mold and manufacturing method will be described below. Here, an example will be described in which an ultraviolet-curable low-siloxane silicone rubber is used as the elastic body 40 of the gasket portion 4.

[0021] First, FIG. 5 shows a molding die 6 for pleating the mesh part 2 constituting the gasketed filter 1 shown in FIG. 1 and the like. The molding die 6 includes a first die 7 and a second die 8 arranged opposite to each other and configured to be movable toward and away from each other. The first die 7 includes a middle die 7A and an outer die 7B, and the middle die 7A and the outer die 7B are configured as separate bodies. The outer die 7B includes a base 73 based on a cylindrical shape and a first joint part 72 arranged on one side of the base 73 and joined to the second die 8. The first joint part 72 includes a plurality of first joint recesses 72b and a plurality of first joint protrusions 72a. A through hole 74 carved into a circular shape is provided in the center part of the base 73. The middle die 7A is inserted into the through hole 74 and is arranged to be movable relative to the outer die 7B in the axial direction (see the outlined arrow D2 in FIG. 5). The lower side of the base 73 is provided with a groove 75 into which an O-ring (not shown) is fitted to close the gap with an outer cylinder (not shown) for moving the outer mold 7B up and down by air. The middle mold 7A is provided with a first pleat forming part 70 having a substantially conical shape and forming the pleat part 22 having a plurality of uniform pleats 22a, and a first apex 71 which is the most protruding part and is disposed at the substantially center of the circularly hollowed out mesh body 20 (see FIG. 4(b)) and forms the apex 21 of the conical mesh part 2. The second mold 8 is provided with a second joining part 82 joined to the first mold 7, a second pleat forming part (not shown) which is provided in substantially the same shape as the first pleat forming part 70 and has a plurality of second recesses, second protrusions, second gusset forming parts and second flange forming parts, and a second apex (not shown) which is provided to match the shape of the first apex 71.

[0022] The first pleat forming portion 70 directly contacts the back side of the net-like body 20 (the inner side of the mesh portion 2 after the gasketed filter 1 is formed) and creases the net-like body 20 constituting the mesh portion 2 to form pleats 22a. The first pleat forming portion 70 has a first convex portion 70a, a first concave portion 70b, a first gusset forming portion 70c, a first flange forming portion 70d, and a first curve forming portion 70e. The first convex portion 70a is formed to protrude in order to form the peak portion of the pleat portion 22. The first concave portion 70b is formed to be recessed in order to form the valley portion of the pleat portion 22. The first gusset forming portion 70c is formed on a flat surface in the shape of a substantially isosceles triangle with the first concave portion 70b as the apex in order to form the gusset portion 22b of the pleat portion 22. The first flange forming portion 70d is formed on an annular flat surface along the circumferential direction in order to form the flange portion 23 of the mesh portion 2. The first curve forming portion 70e is formed on an inwardly recessed curved surface in order to form the outward curved portion 23b of the flange portion 23. The second pleat forming portion (not shown) is formed with a second convex portion so as to be joined to the first convex portion 70a provided on the first pleat forming portion 70. Similarly, the second pleat forming portion (not shown) is formed with a second recess corresponding to the first recess 70b and a second gusset forming portion corresponding to the first gusset forming portion 70c. Furthermore, the second pleat forming portion (not shown) is provided with a second flange forming portion corresponding to the first flange forming portion 70d, and a second curve forming portion corresponding to the first curve forming portion 70e. As a result, the mesh portion 2 having the pleats 22 and the flange portion 23 shown in FIG. 4(c) can be formed.

[0023] The first apex 71 is formed into a circular flat surface in order to form the apex 21, which is the most protruding part of the mesh part 2 having a conical shape, and the approximate center of the circular net-like body 20 that becomes the mesh part 2 is disposed on this first apex 71. The first joining part 72 is provided so as to form an interlocking structure with the second joining part 82 of the second mold 8, which interlocks with each other when clamped and does not rotate. The first joining part 72 of the first mold 7 has first joining protrusions 72a and first joining recesses 72b, which are approximately triangular in side view, alternately provided in succession at equal intervals. The second joining protrusions 82a of the second joining part 82 of the second mold 8 and the first joining recesses 72b of the first joining part 72 of the first mold 7 are joined, and the second joining recesses 82b of the second joining part 82 of the second mold 8 and the first joining protrusions 72a of the first joining part 72 of the first mold 7 are joined (joining of convex and concave).

[0024] According to the above-described molding die 6, the mesh body 20 can be placed on the first pleat forming portion 70 of the intermediate die 7A with the center aligned, the first die 7 and the second die 8 can be clamped together, and the intermediate die 7A having the first top portion 71 can be pushed up into the second die 8. This clamping also bonds the second joining protrusion 82a to the first joining recess 72b, and bonds the second joining recess 82b to the first joining protrusion 72a. That is, the first die 7 and the second die 8 have an interlocking structure in which they are interlocked with each other when clamped and the molding die 6 does not rotate, so that the pleat portion 22 having the multiple pleats 22a and the gusset portion 22b and the flange portion 23 having the outwardly curved portion 23b can be formed in the mesh body 20 with high accuracy.

[0025] A method for producing the gasketed filter 1 using the above-mentioned molding die 6 will now be described. <Mesh portion forming process (S100 to S103)> A long, strip-shaped net body 20 is prepared (see FIG. 4(a)), and is punched into a circular shape as shown in FIG. 4(b) (net body punching process S100). The punched circular (perfect circle) net body 20 is then placed on the first pleat forming portion 70 of the first die 7. At this time, the net body 20 is placed so that its approximate center is at the position of the first apex 71 (net body installation process S101). Next, the second die 8 is moved onto the first die 7, and the first die 7 and the second die 8 are joined together, and the dies are closed with the net body 20 interposed between them. As a result, the net body 20 is sandwiched between the first die 7 and the second die 8, and the cone-shaped mesh portion 2 can be formed in one go from the circular net body 20, and the pleats are drawn, so that the pleats 22a and the gusset portions 22b can be easily formed in one go without causing wrinkles or collapse of the folds. At this time, the end 2a side of the mesh portion 2 is bent outwardly by the first and second bend forming sections, and a flat portion is formed by the first and second flange forming sections, so that the flange-shaped portion 23 having the outward curved portion 23b can be formed (mold closing step S102, pleat forming step S103).Then, the mold is opened after the pleat forming step S103, and the mesh body 20 is taken out of the first mold 7, to obtain the mesh portion 2 shown in Fig. 4(c).

[0026] <Ring portion forming process (S200, S201)> A long metal material 30 in the form of a strip-like plate is prepared (see FIG. 3(a)), and is punched (blanked) into a doughnut shape (a shape in which the approximate center of a circle is punched into a circle) as shown in FIG. 3(b) and FIG. 3(c) (metal material punching process S200). The punching method is not particularly limited, and a die may be used, or laser processing may be used. Next, a bending process (bending process S201) is performed to bend the outer diameter side 30a and the inner diameter side 30b from the center of the doughnut-shaped metal material 30. This bending process forms the curved portion 32 and the outward flange portion 31 of the ring portion 3. At this time, the curved portion 32 is subjected to R processing of a predetermined dimension (for example, about R2 to R3). In addition, at this time, the folded portion 31a of the outward flange portion 31 is not completely folded back by crimping, and the portion between the curved portion 32 and the folded portion 31a is a flat portion 31b, and a corner portion 31c is formed between the flat portion 31b and the folded portion 31a.

[0027] <Integrated processing forming process (S104, S105)> The end 2a of the mesh portion 2 thus obtained is placed at the position of the corner 31c of the ring portion 3 where the folded portion 31a is being crimped (fitting step S104), and the folded portion 31a is crimped inward from the state shown in Fig. 3(d) to the state shown in Fig. 2(a) so as to clamp the flange portion 23 of the mesh portion 2 from both the front and back sides. At this time, the outward curved portion 23b of the flange portion 23 is placed along the downstream side surface 32a of the curved portion 32 of the ring portion 3, and the folded portion 31a is completely folded back. As a result, the mesh portion 2 and the ring portion 3 are integrated together so that the flange portion 23 of the mesh portion 2 does not come off the ring portion 3 (crimping step S105).

[0028] <Gasket formation process (S106 to S108)> Next, with the mesh portion 2 and the ring portion 3 integrated, they are placed so that the inlet 1a faces downward (the flat portion 31b side of the outward flange portion 31 faces downward) as shown in Fig. 4(e). Then, liquid rubber is applied to the entire circumference of the downstream surface of the outward flange portion 31 (the downstream surface 31ab of the folded portion 31a and the downstream surface 32a of the curved portion 32; see Figs. 2(a) and 2(b)) using a dispenser 9 (application step, S106). Then, ultraviolet light is applied to the liquid rubber by an ultraviolet irradiation device (irradiation step, S107) to harden the liquid rubber (hardening step, S108).

[0029] According to the above, since welding for forming the mesh part 2 and injection molding for integrating the ring part 3 and the mesh part 2 are not required, the manufacturing is easy and the manufacturing process can be simplified. In addition, since the ring part 3 can be integrated with the mesh part 2 by crimping, it is possible to prevent foreign matter adhesion (contamination) that occurs during manufacturing and omit the cleaning process, compared to applying an adhesive or manually fitting a rubber gasket manufactured in a separate process into the ring part 3. In addition, since the gasket part 4 is made of liquid rubber, when the liquid rubber is placed on the downstream surface 32a of the curved part 32, it soaks into the part of the net-like body 20 that is not clamped by the outward flange part 31 of the ring part 3 (specifically, a part of the outward curved part 23b of the flange part 23 of the mesh part 2 and a part arranged along the flat part 31b). This further strengthens the fixed relationship between the mesh part 2 and the ring part 3, and prevents the mesh part 2 from fraying. In addition, when applying the liquid rubber, the downstream surface 32a of the curved portion 32 formed by bending and folding and the outward curved portion 23b of the mesh portion 2 act as a damming portion to prevent the liquid rubber from leaking to the opposite surface, making it easier to apply the liquid rubber.

[0030] Next, the evaluation test of the filter will be described with reference to Fig. 7 and Table 1. Note that this test was conducted using a filter not equipped with a gasket, as it was an evaluation test for the difference in the shape of the ring part of the inlet. <Evaluation test> The inventors prepared several filters formed by the above manufacturing procedure, and conducted a test to evaluate the pressure loss (kPa) of the air passing through the filters by changing the shape of the ring part of the inlet 1a. Photographs of the two filters actually used in the test, taken from the inlet side and from an oblique side view, are shown in Figure 7. Figure 7(a) is a photograph of a filter used as a comparative example taken from two directions, and Figure 7(b) is a photograph of a filter used as an example taken from two directions.

[0031] [Table 1] As shown in Table 1, the filter prepared as a comparative example has an inlet shape of "right angle (no R)", "inner diameter 39.5 mm", "total height 50 mm", and the number of wire mesh holes in the mesh part is "200 mesh" (referring to the number of mesh holes in a mesh of 25.4 mm (1 inch) on one side). On the other hand, the filter prepared as an example has an inlet shape as shown in Figure 3(d), with the degree of curvature of curved part 32 being "R2.5 (with R)", "inner diameter 41.0 mm", "total height 50 mm", and the number of wire mesh holes in the mesh part is "200 mesh".

[0032] <Evaluation test results> These two filters were installed in the same pipe, and air was fed at an average flow rate of 1900 L / min. The pressure loss was measured at the pressure detection port, yielding a value of 0.89 kPa for the comparative example and 0.74 kPa for the example. <Consideration> It was estimated that if the mesh part of the filter is pleated, the pleats in the pleats near the filter inlet would turbulently disrupt the airflow, causing pressure loss, so to confirm this estimation, evaluation tests were conducted with two inlet shapes: "right angle (no R)" and "R2.5 (with R)." As a result, it was revealed that by having R, it is possible to suppress turbulence in the airflow at the inlet, and as a result, reduce pressure loss.

[0033] As described above, the shape and configuration of the gasketed filter 1 are not limited to those shown in the drawings. For example, the mesh part 2 is not limited to a wire mesh, and may be made of a synthetic resin material or a rubber material, as long as it is made of a single mesh body 20. The mesh part 2 is not limited to a cone shape, and may be a tapered pyramid shape, so that the mesh part 2 may be a pyramid shape, and its shape is formed according to the shape of the flow path 10 to which it is attached. Therefore, the components that configure the flow path 10 are not limited to the cylindrical first member 11 and second member 12 shown in the drawings. The ring part 3 is not limited to being made of metal, and may be made of synthetic resin. Even when the ring part 3 is made of synthetic resin, the curved part 32 has an R shape. In this case, there are fewer restrictions on the shape that can be manufactured compared to when it is made of metal, but the manufacturing process is different from that described above.

[0034] The manufacturing method of the gasketed filter 1 is not limited to the above-mentioned manufacturing method, and other steps may be added, and the order of the manufacturing steps of the mesh part 2 and the ring part 3 is not limited. For example, the mesh body 20 for forming the mesh part 2 may be cut into a square shape, and after pleating, unnecessary parts may be cut off and integrated with the ring part 3. The configuration and structure of the mold 6 for forming the mesh part 2 of the gasketed filter 1 are not limited to the illustrated example, and the configuration and structure of the first bonding part 72 and the second bonding part 82 are also not limited to the illustrated example. For example, in the mesh part forming step, a cutting blade may be incorporated in the outer diameter part of the first die 7 and the second die 8, and the mesh part may be cut into a circular shape at the same time as the die is closed, so that the mesh body punching step S100, the mesh body installation step S101, the die closing step S102, and the pleat forming step S103 may be performed simultaneously. In this case, the step of aligning the center of the mesh body 20 and the middle die 7A is not necessary. Furthermore, the configuration and structure of the first joint portion 72 and the second joint portion 82 may be an interlocking structure that does not rotate when the molds are clamped by engaging with each other. Furthermore, in the above embodiment, an example in which the outer mold 7B is moved up and down by air has been described, but this is not limited to air, and it may be moved up and down by a spring. Furthermore, instead of the outer mold 7B being movable, the second mold 8 may be movable. Furthermore, the fluid flowing through the flow path 10 is not limited to gas, and may be liquid. [Explanation of symbols]

[0035] 1 Filter with gasket 1a Introduction 10 Flow Path 11 First member 12 Second member 2 Mesh section 20 Reticulum 21 Top 22 Pleats 23 Flange 23a Outer edge 3 Ring section 30 Metal materials 31 Outward flange 31a Turning section 31b Flat part 32 Curved section 4 Gasket part 40 Elastic Body 5 Flow direction

Claims

1. A gasketed filter that is mounted between two members having a flow path and captures impurities contained in a fluid flowing through the flow path, a mesh portion made of a cone-shaped net-like body narrowing from the upstream side to the downstream side in the flow direction of the fluid flowing through the flow path, an annular ring portion made of a metal material that holds the upstream side of the mesh portion, and a gasket portion made of an elastic material that seals between the two members, The ring portion is a gasket-equipped filter having a curved portion formed by bending the inside outward and forming an inlet for the fluid, and an outward flange portion connected to the curved portion and sandwiched between the two members.

2. In claim 1, the mesh portion is made of a metal material and has a flange-shaped portion that is held by the ring portion and is bent outward; The outward flange portion has folded portions which are formed by pinching the flange portion from both the front and back sides and bending it inward by crimping.

3. In claim 1 or 2, The gasket portion is made of ultraviolet-curing liquid rubber, and is disposed on the downstream surface of the outward flange portion.

4. In claim 1, The mesh portion has an apex that protrudes most in the direction of flow of the fluid, and a pleated portion having a plurality of folds with creases extending toward the apex, and the pleated portion and the apex are formed by the mesh body.

5. In claim 1, The mesh portion is a gasket-equipped filter having a conical shape formed by pleating the circular mesh body.

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