Filter Device

Abstract

To enable positioning in the peripheral direction of a filter element even when positioning cannot be performed at the time of filter element insertion.SOLUTION: An upper plate of a filter element includes a first rotation stop part on an upper surface opposed to a head. The head includes a second rotation stop part on a lower surface opposed to the upper plate. One of the first rotation stop part and the second rotation stop part is a convexity and the other is a concavity and a protrusion. The protrusion is provided so as to protrude in the direction opposite to the depth direction of the concavity along the wall surface of a portion of the concavity. In a case of screwing a first thread part to a second thread part by rotating a case or a head, the filter element is rotated when the convexity is not in contact with the protrusion, but the filter element is not rotated when the convexity is in contact with the protrusion. The convexity is inserted to the concavity in such a state that the case and the head are assembled.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a filter device. [Background technology]

[0002] Patent document 1 discloses a filter device in which an IC tag is provided inside an upper plate that is arranged to cover the upper end surface of the filtering material of a filter element, and an antenna is provided on a lid body attached to a case into which the filter element is inserted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-115879 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the invention described in Patent Document 1, the upper plate has a convex portion, and the lid body is formed with a protrusion that positions the convex portion in the circumferential direction. However, the invention described in Patent Document 1 is a configuration unique to return filters in which a filter element is inserted into a case to which a lid body is attached, i.e., the convex portion and protrusion are visible when the filter element is inserted, and cannot be applied to capsule filters, etc., in which the filter element is inserted first.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a filter device that can position a filter element circumferentially even when positioning is not possible when inserting the filter element. [Means for solving the problem]

[0006] In order to solve the above problems, the filter device according to the present invention includes, for example, a substantially bottomed cylindrical case having an open upper end and a first screw portion formed near the opening, a cylindrical filtering portion, and an upper plate provided at the upper end of the filtering portion, the filter element being provided inside the case so as to be rotatable relative to the case, and a head having a second screw portion that can be threadedly engaged with the first screw portion and provided on the case so as to cover the upper end of the case when the second screw portion and the first screw portion are threadedly engaged, the upper plate having a first rotation stopper portion on an upper surface facing the head, and the head having a second screw portion that can be threadedly engaged with the upper plate. and a second rotation prevention portion on the underside of the case, one of the first rotation prevention portion and the second rotation prevention portion being a convex portion and the other being a concave portion and a protrusion, the protrusion being provided so as to protrude along a wall surface of a part of the concave portion in a direction opposite to the depth direction of the concave portion, and when the case or the head is rotated to screw the first screw portion and the second screw portion together, the filter element rotates when the convex portion and the protrusion are not in contact with each other, and the filter element does not rotate when the convex portion and the protrusion are in contact with each other, and when the case and the head are assembled, the convex portion is inserted into the concave portion.

[0007] In the filter device according to the present invention, the upper plate of the filter element has a first anti-rotation portion on its upper surface facing the head, and the head has a second anti-rotation portion on its lower surface facing the upper plate. One of the first anti-rotation portion and the second anti-rotation portion is a convex portion, and the other is a protrusion that protrudes in the opposite direction to the depth direction of the recess along the wall surface of the recess and part of the recess. When the case or the head is rotated to thread the first threaded portion and the second threaded portion, the filter element rotates when the convex portion and the protrusion do not abut, and when the convex portion and the protrusion abut, the filter element does not rotate. When the case and the head are assembled, the convex portion is inserted into the recess. This allows the filter element to be positioned circumferentially even when positioning is not possible during insertion of the filter element.

[0008] The projection may have a length equal to or greater than the pitch of the first and second threaded portions, thereby allowing the convex portion to come into contact with the projection first.

[0009] The first rotation stop portion may be the convex portion that is convex toward the head, and the second rotation stop portion may be the concave portion and the protrusion, and when viewed along the central axis of the filter element and the case, a first direction that is the longitudinal direction of the convex portion may be along a line perpendicular to a radial line passing through the center of the first direction or along a circle that is centered on the central axis and passes through the center of the first direction, and an upper end surface of the convex portion may be inclined so as to be lower toward the end in the first direction. This can prevent problems such as breakage of the filter element inside the case.

[0010] The protrusion may be located at a position overlapping the filtering portion, whereby the force for rotating the case is easily transmitted to the first rotation stopper and the second rotation stopper.

[0011] The first rotation stop portion may be the recess and the protrusion, and the second rotation stop portion may be the protrusion that is convex toward the upper plate, and when viewed along the central axis of the filter element and the case, a second direction that is the longitudinal direction of the protrusion may be along a line perpendicular to a radial line passing through the center of the second direction or along a circle that is centered on the central axis and passes through the center of the second direction, and an upper end surface of the protrusion may be inclined so as to be lower toward the end in the second direction. This can prevent problems such as breakage of the filter element inside the case.

[0012] The inclination angle of the upper end surface may be equal to or greater than the lead angle of the first threaded portion and the second threaded portion, thereby allowing the convex portion to come into contact with the protrusion first.

[0013] An IC tag may be provided on the convex portion, and an antenna may be provided on the head adjacent to the concave portion, thereby allowing the IC tag and the antenna to be close to each other. [Effects of the Invention]

[0014] According to the present invention, even if the filter element cannot be positioned when it is inserted, the filter element can be positioned in the circumferential direction. [Brief explanation of the drawings]

[0015] [Figure 1] 1A to 1C are diagrams showing an outline of a filter device 1, in which (A) is a perspective view, (B) is a front view, and (C) is a plan view. [Figure 2] FIG. 2 is a perspective view of the filter device 1 taken along line AA in FIG. 1(C). [Figure 3] FIG. 2 is a cross-sectional view of the filter device 1 taken along line AA in FIG. 1(C). [Figure 4] FIG. 2 is a cross-sectional view of the filter device 1 taken along line BB in FIG. 1(B). [Figure 5] 1A and 1B are diagrams showing an outline of the upper plate 23, in which (A) is a perspective view, (B) is a plan view, and (C) is a right side view. [Figure 6] FIG. 2 is a perspective view showing an outline of the head 30 as viewed from the -z side. [Figure 7] 1A and 1B are diagrams showing an outline of a head 30, in which (A) is a cross-sectional perspective view and (B) is a cross-sectional view. [Figure 8] 3 is a diagram showing a schematic view of how the case 10 and the filter element 20 are attached to the head 30. FIG. [Figure 9] 3 is a diagram showing a schematic view of how the case 10 and the filter element 20 are attached to the head 30. FIG. [Figure 10] 1A and 1B are diagrams showing an outline of a filter device 2, in which (A) is a perspective view and (B) is a right side view. [Figure 11] FIG. 2 is a perspective view of the filter device 2 cut along a plane parallel to the xz plane including the central axis ax. [Figure 12] FIG. 12 is a view taken along arrow D in FIG. [Figure 13] FIG. 10B is a cross-sectional view taken along line CC in FIG. [Figure 14]1A and 1B are diagrams showing an outline of an upper plate 23A, in which (A) is a perspective view and (B) is a cross-sectional view. [Figure 15] 1A and 1B are diagrams showing an outline of a head 30A, in which (A) is a cross-sectional perspective view and (B) is a cross-sectional view. [Figure 16] 1A and 1B are diagrams showing an outline of a filter device 3 according to one embodiment of the present invention, in which (A) is a perspective view, (B) is a right side view, and (C) is an E-E cross-sectional view of (B). [Figure 17] FIG. 2 is a perspective view of the filter device 3 cut along a plane parallel to the xz plane including the central axis ax. [Figure 18] FIG. 18 is a view taken along arrow G in FIG. [Figure 19] FIG. 16B is a cross-sectional view taken along the line FF of FIG. [Figure 20] 10A and 10B are diagrams showing an outline of an upper plate 23A, in which (A) is a perspective view, (B) is a cross-sectional view taken along plane H of (A), and (C) is a view taken along arrow I of (B). [Figure 21] FIG. 10 is a perspective view showing an outline of the head 30B as viewed from the -z side. [Figure 22] 1A and 1B are diagrams showing an outline of a head 30B, in which (A) is a cross-sectional perspective view and (B) is a cross-sectional view. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, oil will be described as an example of a liquid to be filtered, but the liquid to be filtered is not limited to oil. Also, in this embodiment, a capsule filter will be described as an example, but the filter device of the present invention is not limited to a capsule filter.

[0017] First Embodiment 1 is a diagram showing an outline of a filter device 1 according to one embodiment of the present invention, where (A) is a perspective view, (B) is a front view, and (C) is a plan view. Hereinafter, the extension direction of the filter device 1 (the extension direction of the central axis ax of the filter device 1) will be referred to as the z direction, and the directions perpendicular to the z direction will be referred to as the x direction and y direction. The x direction and the y direction are also perpendicular to each other. Generally, the z direction is the vertical direction, but this is not limited to this.

[0018] The filter device 1 mainly includes a case 10, a filter element 20, and a head 30. With the case 10 attached to the head 30, the filter element 20 is provided in the case 10 and the head 30. An insert member 40 is provided in the head 30.

[0019] Fig. 2 is a perspective view taken along line AA in Fig. 1(C), and Fig. 3 is a cross-sectional view taken along line AA in Fig. 1(C). Fig. 4 is a cross-sectional view taken along line BB in Fig. 1(B). Hatching indicating cross sections is omitted in Figs. 2 to 4. The dashed-dotted arrow in Fig. 3 indicates the flow of oil.

[0020] The case 10 has a generally cylindrical shape with a bottom and is made of a highly corrosion-resistant material (for example, a metal such as stainless steel). The case 10 has an open top and a hollow interior. The filter element 20 is provided inside the case 10.

[0021] The case 10 has a bottom surface 11. A cylindrical protrusion 11a is provided on the bottom surface 11. A filter element 20 is rotatably provided on the protrusion 11a (described in detail later).

[0022] The opening 12 at the upper end of the case 10 is wide-mouthed and has a threaded portion 12a (corresponding to the first threaded portion of the present invention) formed therein. In this embodiment, the threaded portion 12a is a male screw formed on the outer periphery of the opening 12.

[0023] The filter element 20 is a generally cylindrical member with a bottom, and is provided inside the case 10. The filter element 20 mainly includes a filtering portion 21, an inner cylinder 22, an upper plate 23, and a lower plate 24.

[0024] The filtration unit 21 is a substantially cylindrical member having openings at both ends. The filtration unit 21 is formed, for example, by pleating filter paper made of synthetic resin, paper, or the like, and connecting both ends of the pleated filter paper to form a cylindrical shape.

[0025] An upper plate 23 is provided at the upper end of the filtration section 21, and a lower plate 24 is provided at the lower end of the filtration section 21. The upper plate 23 and the lower plate 24 are integrated with the filtration section 21 by adhesive or the like.

[0026] The upper plate 23 mainly has a substantially circular plate-shaped portion 23a provided along the upper end surface of the filtering section 21, a recessed portion 23b provided on the lower side of the plate-shaped portion 23a, a cylindrical portion 23c provided on the upper side of the plate-shaped portion 23a, and a plate-shaped protruding portion 23e (corresponding to the first rotation prevention portion of the present invention) provided on the upper side of the plate-shaped portion 23a.

[0027] The recess 23b protrudes in the -z direction (downward) from the plate-shaped portion 23a. When the filtering portion 21 is provided in the recess 23b, the plate-shaped portion 23a is disposed at the upper end of the filtering portion 21. The cylindrical portion 23c protrudes in the +z direction (upward) from the plate-shaped portion 23a. A connecting tube 33 (described in detail later) of the head 30 is inserted into the cylindrical portion 23c. An elastic member 51 such as an O-ring is provided between the cylindrical portion 23c and the connecting tube 33, so that oil does not leak from between the cylindrical portion 23c and the connecting tube 33.

[0028] 5A and 5B are diagrams showing an outline of the upper plate 23, with (A) being a perspective view, (B) being a plan view (viewed from the +z direction), and (C) being a right side view (viewed from the +x direction). The protrusion 23e is plate-shaped and is provided on the upper surface 23d of the plate-shaped portion 23a facing the head 30. The protrusion 23e is convex toward the head 30. When viewed along the central axis ax of the case 10 and the filter element 20, the protrusion 23e is provided at a position overlapping with the filtering portion 21. When viewed along the central axis ax of the case 10 and the filter element 20, the longitudinal direction of the protrusion 23e (corresponding to the first direction of the present invention) is along a line L2 perpendicular to a radial line L1 passing through the longitudinal center C of the protrusion 23e, i.e., the y direction.

[0029] An IC tag 25 is provided along the z direction on the outer surface (-x side) of the protrusion 23e. In this embodiment, the IC tag 25 is exposed, but the IC tag 25 may be embedded inside the protrusion 23e.

[0030] The upper end surface 23f of the convex portion 23e is inclined so as to become lower toward the end in the y direction. In this embodiment, the inclination angle of the upper end surface 23f is equal to or greater than the lead angle of the threaded portion 12a and the threaded portion 32b (described in detail later). The lead angle φ is expressed by the following mathematical formula (1): where l is the pitch (lead) and d is the effective diameter of the thread. tanφ=l / πd (1)

[0031] Returning to the explanation of Figures 1 to 4, an inner cylinder 22 is provided inside the filtering section 21. A plurality of holes 22a, which serve as oil flow paths, are formed on the side surface of the inner cylinder 22, over substantially the entire side surface. No holes are provided on the bottom surface 22b of the inner cylinder 22, and the oil filtered by the filtering section 21 flows inside the inner cylinder 22 in the +z direction. A cylindrical section 22c that protrudes in the -z direction is provided on the -z side of the bottom surface 22b of the inner cylinder 22. A protrusion 11a is inserted inside the cylindrical section 22c. A gap is provided between the cylindrical section 22c and the protrusion 11a, so that the cylindrical section 22c (i.e., the inner cylinder 22) is rotatable with respect to the protrusion 11a (i.e., the case 10).

[0032] The lower plate 24 mainly has a recess 24a into which the filtration section 21 is inserted, and a cylindrical portion 24b provided on the -z side of the recess 24a. The cylindrical portion 24b is inserted into a cylindrical portion 22d provided near the bottom surface 22b of the inner cylinder 22. An elastic member 52 such as an O-ring is provided between the cylindrical portion 24b and the cylindrical portion 22d. The provision of the elastic member 52 prevents oil from leaking from between the cylindrical portion 24b and the cylindrical portion 22d. In addition, the elastic member 52 fixes the inner cylinder 22 and the lower plate 24 so that the cylindrical portion 24b (i.e., the lower plate 24) and the cylindrical portion 22d (i.e., the inner cylinder 22) do not rotate relative to each other.

[0033] The head 30 is provided in the case 10 so as to cover the opening 12 at the upper end of the case 10. The head 30 mainly has a head main body 31, a cylindrical part 32 provided so as to protrude in the -z direction from the bottom surface 31j of the head main body 31, and a connecting tube 33 provided at approximately the center of the head main body 31 so as to protrude in the -z direction.

[0034] The lower end of the cylindrical portion 32 is an opening 32a. A threaded portion 32b (corresponding to a second threaded portion of the present invention) is formed in the cylindrical portion 32. In this embodiment, the threaded portion 32b is a female thread formed on the outer periphery of the cylindrical portion 32. When the threaded portion 12a and the threaded portion 32b are screwed together, the head 30 is attached to the case 10, and the filter element 20 is attached to the case 10 and the head 30.

[0035] In this embodiment, the threaded portion 12a is a male thread and the threaded portion 32b is a female thread, but the male and female threads may be reversed.

[0036] Fig. 6 is a perspective view showing the outline of head 30 as seen from the -z side. Fig. 7 is a diagram showing the outline of head 30, where (A) is a cross-sectional perspective view and (B) is a cross-sectional view. Hatching indicating cross sections is omitted in Fig. 7.

[0037] The head main body 31 has an inlet 31i through which oil flows in and an outlet 31h through which oil flows out. The oil that flows in through the inlet 31i flows into the case 10 via the recess 31c. The outlet 31h communicates with the hollow portion 33a of the connecting tube 33.

[0038] The head main body 31 also has a recess 31a extending from the bottom surface 31j in the +z direction. The recess 31a is in communication with the hollow portion of the cylindrical portion 32. A recess 31d and a protrusion 31e (corresponding to a second rotation stopper of the present invention) are provided on the bottom surface of the recess 31a, i.e., the lower surface 31b facing the filter element 20 (upper plate 23). The recess 31d has a rectangular shape when viewed along the central axis ax.

[0039] The protrusion 31e is provided along a portion of the wall surface of the recess 31d. The protrusion 31e protrudes in the direction opposite to the depth direction of the recess 31d. Therefore, the tip 31f of the protrusion 31e is located on the -z side (upper plate 23 side) of the lower surface 31b. Note that the height difference d1 between the tip 31f of the protrusion 31e and the lower surface 31b (the protrusion amount of the protrusion 31e) is preferably equal to or greater than the pitch between the threaded portion 12a and the threaded portion 32b. The head main body 31 also has a hole 31g, one end of which opens into the recess 31d.

[0040] Returning to the explanation of Figures 2 to 4, when the case 10 and the head 30 are assembled, the convex portion 23e is inserted into the concave portion 31d. An insertion member 40 having an antenna 41 at its tip is inserted into the hole 31g. Therefore, when the case 10 and the head 30 are assembled and the convex portion 23e is inserted into the concave portion 31d, the antenna 41 and the IC tag 25 are disposed adjacent to each other (for example, at positions about 10 mm apart).

[0041] Next, the function of the filter device 1 configured as described above will be described. Figures 8 and 9 are diagrams that schematically show how the case 10 and the filter element 20 are attached to the head 30. When the threaded portion 12a is threadedly engaged with the threaded portion 32b and the case 10 or the head 30 is rotated, the case 10 and the filter element 20 rotate clockwise relative to the head 30 (see the arrow in Figure 8). As shown in Figure 8, when the threaded portion 12a is not completely engaged with the threaded portion 32b, the convex portion 23e is not in contact with the head 30, so both the case 10 and the filter element 20 rotate clockwise (the filter element 20 does not rotate relative to the case 10).

[0042] As shown in Figure 9, tip 31f of protrusion 31e is located on the -z side (toward upper plate 23) of lower surface 31b. Therefore, when case 10 and filter element 20 are screwed into head 30, protrusion 23e (upper end surface 23f) abuts against protrusion 31e (see dotted arrow in Figure 9). Because upper end surface 23f is inclined, when case 10 and filter element 20 are rotated relative to head 30, filter element 20 rotates relative to case 10 while upper end surface 23f slides against protrusion 31e. This prevents damage to filter element 20 inside case 10 and other problems. Furthermore, because protrusion 23e is located at a position overlapping with filtration unit 21 (radially outward, i.e., not near center axis ax), the force rotating case 10 is easily transmitted to protrusion 23e.

[0043] In this embodiment, the height difference d1 between the tip 31f of the protrusion 31e and the lower surface 31b is equal to or greater than the pitch of the threaded portion 12a and the threaded portion 32b, so that the protrusion 23e can first come into contact with the protrusion 31e. Furthermore, the inclination angle of the upper end surface 23f is equal to or greater than the lead angle of the threaded portion 12a and the threaded portion 32b, so that the protrusion 23e can come into contact with the protrusion 31e without coming into contact with the lower surface 31b.

[0044] When the case 10 and the filter element 20 are further screwed into the head 30, the convex portion 23e abuts against the protrusion 31e, causing the filter element 20 to rotate relative to the case 10. The case 10 rotates clockwise, but the filter element 20 does not rotate and is pushed up toward the head 30 (see the arrow in Figure 9). As a result, the convex portion 23e is inserted into the recess 31d along the protrusion 31e.

[0045] When the screw portion 12a and the screw portion 32b are screwed together and the case 10 and the head 30 are assembled, the convex portion 23e is inserted into the concave portion 31d, and the antenna 41 and the IC tag 25 face each other, as shown in FIGS.

[0046] According to this embodiment, the filter element 20 must be inserted into the case 10 before the case 10 is attached to the head 30, and even in a filter device 1 in which the filter element 20 cannot be positioned relative to the head 30 when the filter element 20 is inserted, the filter element 20 can be positioned in the circumferential direction. In particular, positioning is smooth because it can be achieved simply by assembling the case 10 with the filter element 20 inserted and the head 30.

[0047] In the present embodiment, the protrusion 23e has two upper end surfaces 23f, and the upper end of the protrusion 23e is triangular in side view. However, the shape of the upper end of the protrusion 23e is not limited to this. For example, the upper end of the protrusion 23e may be flat, and the protrusion 23e may be rectangular in side view. Furthermore, for example, the two upper end surfaces 23f may be spaced apart, and the upper end of the protrusion 23e may be trapezoidal in side view. However, to prevent problems caused by a surface (flat surface) parallel to the upper surface 23d at the upper end of the protrusion 23e hitting the protrusion 31e, it is desirable that the upper end of the protrusion 23e does not have a flat surface. Furthermore, the upper end surface of the protrusion 23e may have one inclined surface (only the inclined surface on the right side in FIG. 5(C)).

[0048] In the present embodiment, the inclination angle of upper end surface 23f is equal to or greater than the lead angle of threaded portion 12a and threaded portion 32b, but the inclination angle of upper end surface 23f is not limited to this. However, in order to prevent convex portion 23e from contacting lower surface 31b, it is desirable to set the inclination angle of upper end surface 23f to be equal to or greater than the lead angle of threaded portion 12a and threaded portion 32b.

[0049] In addition, in this embodiment, the height difference d1 between the tip 31f and the lower surface 31b is equal to or greater than the pitch of the threaded portion 12a and the threaded portion 32b, but the amount of protrusion 31e protruding from the lower surface 31b is not limited to this. However, in order to reliably bring the convex portion 23e into contact with the protrusion 31e, it is desirable to make the amount of protrusion 31e protruding from the lower surface 31b equal to or greater than the pitch of the threaded portion 12a and the threaded portion 32b.

[0050] In the present embodiment, the shape of the recess 31d when viewed along the central axis ax is rectangular, but the shape of the recess 31d is not limited to this. For example, the shape of the recess 31d when viewed along the central axis ax may be a partial ring shape.

[0051] In addition, in this embodiment, when viewed along the central axis ax, the longitudinal direction of the protrusion 23e is along the line L2, but the orientation of the longitudinal direction of the protrusion 23e is not limited to this. For example, as shown in FIG. As shown in B), the longitudinal direction of the protrusion 23e may be along a circle L3 that is centered on the central axis ax and passes through the point C.

[0052] Furthermore, in this embodiment, the IC tag 25 is provided on the protrusion 23e, but the IC tag 25 may be provided at a position other than the protrusion 23e. Since the filter element 20 is positioned in the circumferential direction by the protrusion 23e and the recess 31d, the antenna 41 may be provided on the head 30 so that the antenna 41 is adjacent to the IC tag 25 when the threaded portion 12a and the threaded portion 32b are completely screwed together.

[0053] <Second embodiment> In the first embodiment of the present invention, the IC tag 25 is provided along the z direction, but the arrangement of the IC tag 25 is not limited to this. In the filter device 2 according to the second embodiment of the present invention, the IC tag 25 is provided along the x and y directions. The filter device 2 will be described below. Note that the same parts as those in the filter device 1 are given the same reference numerals and description thereof will be omitted.

[0054] 10 is a diagram showing an outline of a filter device 2 according to one embodiment of the present invention, with (A) being a perspective view and (B) being a right side view. The filter device 2 mainly comprises a case 10, a filter element 20A, and a head 30A. When the case 10 is attached to the head 30A, the filter element 20A is provided in the case 10 and the head 30A.

[0055] Fig. 11 is a perspective view of Fig. 10(A) cut along a plane parallel to the xz plane including the central axis ax, and Fig. 12 is a view seen from the arrow D in Fig. 11. Fig. 13 is a cross-sectional view taken along CC in Fig. 10(B). Hatching indicating cross sections is omitted in Figs. 11 to 13. The dashed-dotted arrow in Fig. 12 indicates the flow of oil.

[0056] The filter element 20A is a generally cylindrical member with a bottom, and is provided inside the case 10. The filter element 20A mainly includes a filtering portion 21, an inner cylinder 22, an upper plate 23A, and a lower plate 24.

[0057] An upper plate 23A is provided at the upper end of the filtering section 21. The upper plate 23A mainly has a plate-shaped section 23a, a recessed section 23b, a cylindrical section 23c, and a plate-shaped protruding section 23g (corresponding to a first rotation preventing section of the present invention) provided on the upper side of the plate-shaped section 23a. The protruding section 23g is columnar, protruding toward the head 30, and provided on the upper surface 23d.

[0058] Fig. 14 is a diagram showing an outline of the upper plate 23A, with (A) being a perspective view and (B) being a cross-sectional view. Hatching indicating cross sections is omitted in Fig. 14. The protrusion 23g is provided at a position overlapping the filtering section 21 when viewed along the central axis ax of the case 10 and the filter element 20. The protrusion 23g has a main body 23h and a reinforcing rib 23i, but the shape and structure of the protrusion 23g are not limited to this.

[0059] The longitudinal direction of the protrusion 23g is along a line L2 that is perpendicular to the line L1. The upper end surface 23j of the protrusion 23e is inclined so that it becomes lower as it approaches the end in the y direction. The inclination angle of the upper end surface 23j is equal to or greater than the lead angle of the threaded portion 12a and the threaded portion 32b.

[0060] An IC tag 25 is provided along the x and y directions on the upper (+z side) surface of the convex portion 23g. The upper end of the main body 23h has a recessed cutout portion 23k cut out in the center, and the IC tag 25 is provided inside the cutout portion 23k. This allows the IC tag 25 to be provided near the upper end of the convex portion 23g while leaving the upper end surface 23j. In this embodiment, the IC tag 25 is exposed, but the IC tag 25 may also be embedded inside the convex portion 23g.

[0061] 11 to 13. The head 30A is provided on the case 10 so as to cover the opening 12 at the top end of the case 10. The head 30 mainly has a head main body portion 31A, a cylindrical portion 32, and a connecting tube 33.

[0062] FIG. 15 is a diagram showing an outline of the head 30A, where (A) is a cross-sectional perspective view and (B) is a cross-sectional view. Hatching indicating cross sections is omitted in FIG. 15. The head main body 31A has a recess 31a, a recess 31d, a protrusion 31e, an outlet 31h, and an inlet 31i. The head main body 31A also has a hole 31g, one end of which opens into the recess 31d. An insertion member 40 is inserted into the hole 31g.

[0063] 11 to 13. When the case 10 and the head 30A are assembled, the convex portion 23g is inserted into the concave portion 31d, so that the antenna 41 and the IC tag 25 are disposed adjacent to each other.

[0064] Next, the function of the filter device 2 configured in this manner will be described. When the case 10 or the head 30A is rotated with the threaded portion 12a and the threaded portion 32b screwed together, the case 10 and the filter element 20A rotate clockwise (see the arrow in FIG. 11) relative to the head 30A. When the threaded portion 12a and the threaded portion 32b are not screwed together, the convex portion 23g is not in contact with the head 30A, so both the case 10 and the filter element 20A rotate clockwise.

[0065] Because tip 31f of protrusion 31e is located on the -z side (upper plate 23 side) of lower surface 31b, when case 10 and filter element 20A are screwed into head 30A as is, protrusion 23g abuts against protrusion 31e. Because the inclination angle of upper end surface 23j is equal to or greater than the lead angle of threaded portion 12a and threaded portion 32b, protrusion 23g can abut against protrusion 31e without abutting against lower surface 31b.

[0066] When the case 10 and filter element 20A are screwed into the head 30A with the protrusion 23g abutting against the projection 31e, the filter element 20A rotates relative to the case 10, causing the case 10 to rotate clockwise, but the filter element 20A does not rotate and is pushed up toward the head 30A. As a result, the protrusion 23g is inserted into the recess 31d along the projection 31e. When the threaded portion 12a and the threaded portion 32b are screwed together and the case 10 and the head 30A are assembled, the protrusion 23g is inserted into the recess 31d, and the antenna 41 and the IC tag 25 face each other.

[0067] According to this embodiment, the filter element 20A must be inserted into the case 10 before the case 10 is attached to the head 30A, and even in a filter device 2 in which the filter element 20A cannot be positioned circumferentially relative to the head 30A when the filter element 20A is inserted, the filter element 20A can be positioned circumferentially. In particular, positioning is smooth because it can be achieved simply by assembling the case 10 with the filter element 20A inserted and the head 30A.

[0068] <Third embodiment> In the first embodiment of the present invention, the filter element 20 is positioned by inserting the convex portion 23e of the upper plate 23 into the concave portion 31d of the head main body portion 31, but the convex portion and the concave portion may be reversed. A filter device 3 according to a third embodiment of the present invention has a concave portion provided on the upper plate and a convex portion provided on the head main body portion. The filter device 3 will be described below. Note that the same parts as those in the filter device 1 are given the same reference numerals and their description will be omitted.

[0069] 16 is a diagram showing an outline of a filter device 3 according to one embodiment of the present invention, where (A) is a perspective view, (B) is a right side view, and (C) is an E-E cross-sectional view of (B). The filter device 3 mainly comprises a case 10, a filter element 20B, and a head 30B. When the case 10 is attached to the head 30B, the filter element 20B is provided in the case 10 and the head 30B.

[0070] Fig. 17 is a perspective view of Fig. 16(A) cut along a plane parallel to the xz plane including the central axis ax, and Fig. 18 is a view seen from the arrow G in Fig. 17. Fig. 19 is a cross-sectional view taken along the line FF in Fig. 16(B). Hatching indicating cross sections is omitted in Figs. 17 to 19. The dashed-dotted arrow in Fig. 18 indicates the flow of oil.

[0071] The filter element 20B is a substantially cylindrical member with a bottom, and is provided inside the case 10. The filter element 20B mainly includes a filtering portion 21, an inner cylinder 22, an upper plate 23B, and a lower plate 24.

[0072] Upper plate 23B mainly has plate-like portion 23a, recessed portion 23b, protruding portion 23s, and cylindrical portion 23l provided on upper surface 23d so as to protrude in the +z direction.

[0073] FIG. 20 is a diagram showing an outline of the upper plate 23A, where (A) is a perspective view, (B) is a cross-sectional view taken along plane H of (A), and (C) is a view taken along arrow I of (B). Hatching indicating cross sections is omitted in FIG. 20. The cylindrical portion 23l mainly includes a cylindrical portion 23m and a cylindrical portion 23n provided in a band shape along the inner peripheral surface of the cylindrical portion 23m. The cylindrical portion 23n includes a recess 23o recessed toward the filtering portion 21 (in the -z direction), and a protrusion 23p protruding toward the +z direction (opposite the depth direction of the recess 23o) on the upper surface 23r facing the head 30B. The protrusion 23p extends along a portion of the wall surface of the recess 23o. The recess 23o and the protrusion 23p are provided along the cylindrical portion 23m. The cylindrical portion 23n, the recess 23o, and the protrusion 23p correspond to the first rotation stopper of the present invention.

[0074] When viewed along the central axis ax, the longitudinal direction of the protrusion 23p (corresponding to the second direction of the present invention) is along a circle L3 that is centered on the central axis ax and passes through the longitudinal center C of the protrusion 23p. The protrusion amount d2 of the protrusion 23p is equal to or greater than the pitch of the threaded portion 12a and the threaded portion 32b. The upper end surface 23q of the protrusion 23p is inclined so as to become lower outward in the circumferential direction. It is desirable that the inclination angle of the upper end surface 23q be equal to or greater than the lead angle of the threaded portion 12a and the threaded portion 32b.

[0075] 17 to 19. Head 30B is provided in case 10 so as to cover opening 12 at the upper end of case 10. Head 30B mainly has a head main body portion 31B, a cylindrical portion 32, and a connecting tube 33A provided approximately in the center of head main body portion 31B so as to protrude in the -z direction.

[0076] Figure 21 is a perspective view showing the outline of head 30B as seen from the -z side. Figure 22 is a diagram showing the outline of head 30B, where (A) is a cross-sectional perspective view and (B) is a cross-sectional view. Hatching indicating cross sections is omitted in Figure 22.

[0077] The head main body 31B has a recess 31k provided from the bottom surface 31j toward the +z direction, an inlet 31i, an outlet 31h, and a hole 31g. The oil flowing in from the inlet 31i flows into the case 10 via the recess 31k.

[0078] A connecting tube 33A is provided on the lower surface 31l of the recess 31a. The connecting tube 33A has cylindrical portions 33b and 33c that protrude from the lower surface 31l in the -z direction. The cylindrical portion 33b is provided on the outer side of the cylindrical portion 33c and is shorter in height than the cylindrical portion 33c. A protrusion 33e (corresponding to the second rotation preventing portion of the present invention) that protrudes toward the upper plate 23B is provided on the tip surface of the cylindrical portion 33b, i.e., the lower surface 33d that faces the filter element 20B (upper plate 23B).

[0079] The protrusion 33e is provided along the cylindrical portion 33c. An upper end surface 33f of the protrusion 33e is inclined so as to become lower toward the outside in the circumferential direction. The inclination angle of the upper end surface 33f is preferably equal to or greater than the lead angle of the threaded portion 12a and the threaded portion 32b.

[0080] 17 to 19, the function of the filter device 3 configured in this manner will be described. When the case 10 or the head 30B is rotated with the threaded portion 12a and the threaded portion 32b threadedly engaged, the case 10 and the filter element 20B rotate clockwise (see the arrow in FIG. 17) relative to the head 30B. When the threaded portion 12a and the threaded portion 32b are not completely engaged with each other, the protrusion 33e is not in contact with the filter element 20B (upper plate 23B), and therefore both the case 10 and the filter element 20B rotate clockwise.

[0081] When the case 10 and filter element 20A are screwed into the head 30A in this state, the convex portion 33e comes into contact with the protrusion 23p. Because the protrusion amount d2 of the protrusion 23p is equal to or greater than the pitch between the threaded portion 12a and the threaded portion 32b, the convex portion 33e can come into contact with the protrusion 23p without coming into contact with the lower surface 31b. Furthermore, because the upper end surface 23q is inclined, when the case 10 and the filter element 20B are rotated relative to the head 30B, the upper end surface 23q slides against the convex portion 33e as the filter element 20B rotates relative to the case 10. This prevents problems such as damage to the filter element 20B inside the case 10.

[0082] When the case 10 and filter element 20B are screwed into the head 30B with the protrusion 33e abutting against the projection 23p, the filter element 20B rotates relative to the case 10, causing the case 10 to rotate clockwise, but the filter element 20B does not rotate and is pushed up toward the head 30B. As a result, the protrusion 33e is inserted into the recess 23o along the projection 23p. When the threaded portion 12a and the threaded portion 32b are completely screwed together, the protrusion 33e is inserted into the recess 23o.

[0083] Furthermore, the filter element 20B is positioned in the circumferential direction by inserting the convex portion 33e into the recessed portion 23o, so that the IC tag 25 provided on the convex portion 23s faces the antenna 41 provided on the head 30B.

[0084] According to this embodiment, the filter element 20B must be inserted into the case 10 before the case 10 is attached to the head 30B, and even in a filter device 3 in which the filter element 20B cannot be positioned circumferentially relative to the head 30B when the filter element 20B is inserted, the filter element 20B can be positioned circumferentially. In particular, positioning is smooth because it can be achieved simply by assembling the case 10 with the filter element 20B inserted and the head 30B.

[0085] In the present embodiment, the convex portion 33e, the concave portion 23o, and the protrusion 23p do not overlap with the filtering portion 21 when viewed along the central axis, but the convex portion 33e, the concave portion 23o, and the protrusion 23p may overlap with the filtering portion 21. For example, the concave portion 23o and the protrusion 23p may be provided on the outer peripheral surface of the cylindrical portion 23m, and the convex portion may be provided on the head main body portion 31B.

[0086] Furthermore, in this embodiment, the protrusion 23p is rod-shaped, but the shape of the protrusion 23p is not limited to this and may be, for example, plate-shaped. Similarly, in this embodiment, the convex portion 33e is rod-shaped, but the shape of the convex portion 33e is not limited to this. Furthermore, in this embodiment, the longitudinal direction of the protrusion 23p is along the circle L3, but the longitudinal direction of the convex portion 23g may be along the line L2 that is perpendicular to the line L1. In this embodiment, the protrusion 33e is rod-shaped, but the shape of the protrusion 33e is not limited to this.

[0087] Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and design modifications within the scope of the gist of the present invention are also included. For example, the above examples have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add, delete, or replace other configurations to the configuration of one embodiment.

[0088] Furthermore, the term "substantially" is a concept that includes not only cases where something is strictly identical, but also errors or deformations that do not cause loss of identity. For example, "substantially cylindrical shape" is not limited to cases where something is strictly cylindrical, but also includes cases where something can be regarded as the same as a cylindrical shape. Furthermore, for example, when expressing something as simply orthogonal, parallel, coincident, etc., it includes not only cases where something is strictly orthogonal, parallel, coincident, etc., but also cases where something is approximately parallel, approximately orthogonal, approximately coincident, etc.

[0089] Furthermore, "vicinity" means including a certain range (which can be arbitrarily determined) near a reference position. For example, "near an edge" is a concept that indicates a certain range near the edge, which may or may not include the edge. [Explanation of symbols]

[0090] 1, 2, 3: Filter device 10: Case 11: Bottom 11a: Convex part 12: Opening 12a: Threaded part 20, 20A, 20B: Filter elements 21:Filtration section 22: Inner cylinder 22a: hole 22b: Bottom 22c: Cylindrical part 22d: Cylindrical part 23, 23A, 23B: Upper plate 23a: Plate-shaped part 23b: recess 23c: Cylindrical part 23d:Top surface 23e, 23g, 23s: Convex part 23f, 23j: Upper end surface 23h: Main body 23i: Rib 23k: Notch 23l: Cylindrical part 23m, 23n: Cylindrical part 23o: Recess 23p: Protrusion 23q: Upper end surface 23r:Top surface 24: Lower plate 24a: Recess 24b: Cylindrical part 25: IC tag 30, 30A, 30B: Head 31, 31A, 31B: Head body 31a, 31k: recessed portion 31b, 31l: Bottom surface 31c, 31d: recesses 31e: Protrusion 31f: Tip 31g: hole 31h: Outlet 31i:Inlet 31j: Bottom 32: Cylindrical part 32a: opening 32b: Threaded section 33, 33A: connecting tube 33a: Hollow part 33b, 33c: cylindrical portion 33d: Bottom surface 33e: Convex part 33f: Upper end surface 40: Insertion member 41: Antenna 51, 52: Elastic member

Claims

1. a substantially cylindrical case having an open top end and a first screw portion formed near the opening; a filter element having a cylindrical filtering portion and an upper plate provided at an upper end of the filtering portion, the filter element being provided inside the case so as to be rotatable relative to the case; a head provided on the case, the head having a second threaded portion that can be threadedly engaged with the first threaded portion, the head covering an upper end of the case when the second threaded portion and the first threaded portion are threadedly engaged; Equipped with the upper plate has a first rotation stopper on an upper surface facing the head, the head has a second rotation stopper on a lower surface facing the upper plate, one of the first rotation stop portion and the second rotation stop portion is a convex portion and the other is a concave portion and a protrusion, the protrusion is provided along a part of a wall surface of the recess so as to protrude in a direction opposite to a depth direction of the recess, When the case or the head is rotated to screw the first screw portion and the second screw portion together, the filter element rotates when the convex portion and the protrusion are not in contact with each other, and the filter element does not rotate when the convex portion and the protrusion are in contact with each other, When the case and the head are assembled, the protrusion is inserted into the recess, a protrusion amount of the protrusion is equal to or greater than the pitch of the first thread portion and the second thread portion, the first rotation stopper is the protrusion, and is protruding toward the head; the second rotation preventing portion is the recess and the protrusion, When viewed along the central axis of the filter element and the case, a first direction that is a longitudinal direction of the convex portion is along a line perpendicular to a radial line passing through the center of the first direction, or along a circle that passes through the center of the first direction and has the central axis as its center, The upper end surface of the convex portion is inclined so as to become lower toward the end in the first direction. A filter device characterized by:

2. The convex portion is provided at a position overlapping the filtering portion.

2. The filter device according to claim 1.

3. A case having a generally cylindrical shape with a bottom, the upper end of which is open and the first screw portion formed near the opening; a filter element having a cylindrical filtering portion and an upper plate provided at an upper end of the filtering portion, the filter element being provided inside the case so as to be rotatable relative to the case; a head provided on the case, the head having a second threaded portion that can be threadedly engaged with the first threaded portion, the head covering an upper end of the case when the second threaded portion and the first threaded portion are threadedly engaged; Equipped with the upper plate has a first rotation stopper on an upper surface facing the head, the head has a second rotation stopper on a lower surface facing the upper plate, one of the first rotation stop portion and the second rotation stop portion is a convex portion and the other is a concave portion and a protrusion, the protrusion is provided along a part of a wall surface of the recess so as to protrude in a direction opposite to a depth direction of the recess, When the case or the head is rotated to screw the first screw portion and the second screw portion together, the filter element rotates when the convex portion and the protrusion are not in contact with each other, and the filter element does not rotate when the convex portion and the protrusion are in contact with each other, When the case and the head are assembled, the protrusion is inserted into the recess, a protrusion amount of the protrusion is equal to or greater than the pitch of the first thread portion and the second thread portion, the first rotation stop portion is the recess and the protrusion, the second rotation preventing portion is the protrusion, and is protruding toward the upper plate, When viewed along the central axis of the filter element and the case, a second direction that is a longitudinal direction of the protrusion is along a line perpendicular to a radial line passing through the center of the second direction, or along a circle that passes through the center of the second direction and has the central axis as its center, The upper end surface of the protrusion is inclined so as to become lower toward the end in the second direction. A filter device characterized by:

4. The inclination angle of the upper end surface is equal to or greater than the lead angle of the first threaded portion and the second threaded portion.

4. The filter device according to claim 3.

5. An IC tag is provided on the convex portion, The head is provided with an antenna adjacent to the recess.

3. The filter device according to claim 1 or 2.

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