JP2021030143A - filter - Google Patents

Abstract

To provide a filter capable of reducing pressure losses when introducing a fluid.SOLUTION: A filter 20 includes: a mesh body 22 that is cylindrical, and is disposed in a channel 100 so as to position one end portion 22A in a cylinder axis direction on an upstream side in a fluid flowing direction with respect to the other end portion 22B; and a supporting body 24 that has an introducing portion 26 fixed in the channel 100, closing the one end portion 22A of the mesh body 22, and provided with a circular hole 32 for guiding a fluid L into the inside of the mesh body 22, a supporting portion 28 closing the other end portion 22B of the mesh body 22, and a plurality of strut portions 30 extending from the introducing portion 26 to the supporting portion 28, provided at intervals in a circumferential direction of the circular hole 32, coupling the introducing portion 26 and the supporting portion 28, and holding the shape of the mesh body 22, and is integrally with the mesh body 22. On the opposite side to the supporting portion 28 side of the circular hole 32, a diameter-contracting portion 33 gradually decreasing a diameter toward the supporting portion 28 is provided, and the diameter-contracting portion 33 is provided with a recessed portion 34 on an upper side in an extending direction of the strut portion 28.SELECTED DRAWING: Figure 4

Description

The present invention relates to a filter for oil.

Patent Document 1 discloses a filter that removes impurities in a fluid and is formed by integrally molding a resin.

Japanese Unexamined Patent Publication No. 8-254112

By the way, in the filter of Patent Document 1, a circular hole which is a fluid introduction port is formed in the upper support. This circular hole has a large diameter portion having a constant diameter on the upstream side in the fluid flow direction, and a small diameter portion having a constant diameter smaller than the large diameter portion on the downstream side, and is located between the large diameter portion and the small diameter portion. A stepped portion is formed. Since such a step portion is orthogonal to the flow direction of the fluid, the flow of the fluid is obstructed, and the pressure loss when the fluid flows through the circular hole tends to increase.

In consideration of the above facts, an object of the present invention is to provide a filter capable of reducing pressure loss at the time of introducing a fluid.

The filter of the first aspect of the present invention has a cylindrical shape, and has a mesh body arranged in the flow path so that one end in the cylindrical axis direction is located upstream of the other end in the fluid flow direction, and the above. An introduction portion that is fixed in the flow path, closes the one end portion of the mesh body, and is provided with a circular hole for guiding a fluid inside the mesh body, and a support portion that closes the other end portion of the mesh body. A plurality of strut portions extending from the introduction portion to the support portion and provided at intervals in the circumferential direction of the circular hole, connecting the introduction portion and the support portion, and maintaining the shape of the mesh body. A resin-made support that has and is integrated with the mesh body, and has a reduced diameter that gradually decreases toward the support portion on the side of the circular hole opposite to the support portion side. A portion is provided, and the reduced diameter portion is provided with a recess in the extending direction of the support column portion.

In the filter of the first aspect, the fluid flowing through the flow path is guided to the inside of the mesh body through the circular hole of the introduction portion. When the fluid guided to the inside of the mesh body passes through the mesh of the mesh body, the foreign matter is removed by the mesh body.

In the above filter, since a diameter-reduced portion whose diameter gradually decreases toward the support portion is provided on the side opposite to the support portion side of the circular hole, fluid separation when the fluid passes through the circular hole is suppressed. As a result, in the above filter, the pressure loss at the time of introducing the fluid can be reduced as compared with the filter in which the circular hole is provided with a step portion orthogonal to the flow direction of the fluid, for example.

Further, in the above filter, the mesh body and the resin support are integrated. Here, the mesh body and the resin support can be integrated by performing insert molding. When the filter is manufactured by insert molding, first, the mesh body is set in the pin portion with respect to the molding mold having the pin portion for forming the circular hole of the introduction portion and inserting and holding the mesh body. At this time, the mesh body is positioned by moving the mesh body to a position where one end of the mesh body in the tubular axis direction hits the molding convex portion for molding the plurality of concave portions provided in the molding die. .. By using such a molding mold, positioning can be performed with high accuracy and positioning work becomes easy.

Furthermore, since the above filter has a recess formed in the extending direction of the strut portion, for example, when the molten resin is injected into the cavity portion for molding the strut portion, the cavity portion for molding the strut portion is used. It is possible to reduce the resistance when the molten resin flows into the cavity portion where the introduction portion is molded. As a result, the moldability of the support constituting the filter is improved.

In the filter of the second aspect, the bottom of the recess is a flat surface in the filter of the first aspect.

In the filter of the second aspect, since the bottom of the concave portion is flat, the corresponding portion of the molding convex portion for molding the bottom of the concave portion is flat. Therefore, when the filter is manufactured by insert molding, a mesh is used. The body can be positioned stably.

In the filter of the third aspect, in the filter of the first aspect or the second aspect, the diameter of the mesh body is gradually reduced from the one end portion toward the other end portion.

In the filter of the third aspect, since the diameter of the mesh body is gradually reduced from one end to the other end, the fluid makes the mesh body smoother than, for example, a filter having a constant diameter of the mesh body. You can go through. That is, the above filter can reduce the pressure loss of the fluid passing through the inside.

The filter of the fourth aspect is the filter of any one of the first to third aspects, and the strut portion extends from the end portion of the strut portion on the reduced diameter portion side toward the reduced diameter portion. At the same time, an inclined surface is provided so that the distance from the central axis of the circular hole gradually increases toward the reduced diameter portion.

In the filter of the fourth aspect, the strut portion is provided with an inclined surface that extends from the end portion of the strut portion on the reduced diameter portion side toward the reduced diameter portion and gradually increases the distance from the central axis of the circular hole toward the reduced diameter portion. Since it is provided, it is possible to prevent the flow of the fluid passing through the circular hole from being obstructed by the strut portion. In other words, the pressure loss due to the support column of the fluid passing through the circular hole can be reduced.

The filter of the fifth aspect is the filter of any one of the first to fourth aspects, and the cross-sectional shape of the reduced diameter portion along the central axis of the circular hole is arcuate.

In the filter of the fifth aspect, since the cross-sectional shape of the reduced diameter portion along the central axis of the circular hole is arcuate, the pressure loss of the fluid passing through the circular hole can be further reduced.

The filter of the sixth aspect is the filter of any one of the first to fifth aspects, wherein the flow path is located downstream of the first flow path member and the flow direction of the first flow path member. It is composed of two flow path members, and a flange portion that projects from the outer periphery and is sandwiched between the first flow path member and the second flow path member is provided on the downstream side of the introduction portion in the flow direction. An O-ring for sealing between the flange portion and the first flow path member is mounted on the flange portion.

In the filter of the sixth aspect, a flange portion is provided on the downstream side of the introduction portion in the fluid flow direction, and an O-ring is placed on the flange portion. As a result, in the above filter, the flange portion is sandwiched between the first flow path member and the second flow path member, so that the space between the first flow path member and the flange portion is sealed by the O-ring.

According to the present invention, it is possible to provide a filter capable of reducing the pressure loss at the time of introducing a fluid.

It is a perspective view which looked at the filter which concerns on one Embodiment of this invention from obliquely above. It is a top view of the filter shown in FIG. FIG. 3 is a sectional view taken along line 3-3 of the filter shown in FIG. It is a cross-sectional view of the filter shown in FIG. 2 by line 4-4. It is sectional drawing of the molding die (cross-sectional view corresponding to the sectional view of FIG. 3) which shows the state which set the mesh body in the molding die for filter molding. 6 is a sectional view taken along line 6-6 of the molding die shown in FIG. It is an enlarged view of the part pointed out by the arrow 7 of FIG. It is sectional drawing of the molding die (cross-sectional view corresponding to the sectional view of FIG. 5) which shows the state which filled the molten resin in a molding die. 9-9 is a sectional view taken along line 9-9 of the molding die shown in FIG. It is sectional drawing (cross-sectional view corresponding to the sectional view of FIG. 3) which shows the state which the filter shown in FIG. 1 is arranged in a flow path. It is sectional drawing (cross-sectional view corresponding to the sectional view of FIG. 4) of the filter which concerns on other embodiment.

Next, the filter 20 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4 and 10.

As shown in FIG. 10, the filter 20 of the present embodiment is a filter arranged in the flow path 100 for removing foreign matter from the fluid L flowing in the flow path 100. The filter 20 may be used, for example, as an oil filter for an automatic transmission of an automobile. In this case, the filter 20 removes impurities (foreign substances) such as metal wear debris and dust mixed in the mission oil as an example of the fluid L. The present invention is not limited to the above applications, and may be used in an apparatus or the like for the purpose of removing foreign substances in the fluid L.

As shown in FIG. 10, the flow path 100 of the present embodiment has a tubular first flow path member 102 and a tubular second flow path located downstream in the flow direction of the fluid L of the first flow path member 102. It is composed of a road member 104. In the following, the flow direction of the fluid L will be appropriately referred to as the “fluid flow direction”.

As shown in FIGS. 1 to 4, the filter 20 includes a metal mesh body 22 and a resin support 24. Further, as will be described in detail later, the filter 20 of the present embodiment is manufactured by insert molding. Therefore, the mesh body 22 and the support body 24 are integrated.

(Mesh body)
As shown in FIGS. 1 and 3, the mesh body 22 is a metal mesh formed in a cylindrical shape. The mesh body 22 is arranged in the flow path 100 so that one end 22A in the tubular axis direction (arrow X direction in FIG. 3) is located upstream of the other end 22B in the fluid flow direction. The arrow FD shown in FIG. 10 is the fluid flow direction. Further, in the filter 20 arranged in the flow path 100, the direction from one end 22A to the other end 22B of the mesh body 22 in the tubular axis direction is the same as the fluid flow direction.

Further, the diameter of the mesh body 22 gradually decreases from one end 22A in the tubular axis direction toward the other end 22B. Specifically, the peripheral portion 22C of the mesh body 22 of the present embodiment extends along a direction inclined with respect to the tubular axis direction when viewed in a cross section along the tubular axis direction. The present invention is not limited to this configuration, and the peripheral portion 22C may extend while being curved diagonally with respect to the tubular axis direction when viewed in a cross section along the tubular axis direction.

(Support)
As shown in FIGS. 1 to 4, the support body 24 has an introduction portion 26, a support portion 28, and a plurality of strut portions 30. The support 24 is a resin integrally molded product made of the same resin.

As shown in FIGS. 1 and 2, the introduction portion 26 has a disk shape, and a circular hole 32 as a through hole is formed in the central portion. The circular hole 32 penetrates the introduction portion 26 in the thickness direction. The circular hole referred to here includes a regular circular hole (through hole having a perfect circular cross section) and an elliptical hole (through hole having an elliptical cross section).

Further, the introduction portion 26 closes one end portion 22A of the mesh body 22 in the tubular axis direction. Specifically, one end 22A of the mesh body 22 is embedded in the peripheral portion of the circular hole 32 of the introduction portion 26. As a result, the fluid is guided to the inside of the mesh body 22 through the circular hole 32.

Further, as shown in FIG. 3, a diameter-reduced portion 33 whose diameter gradually decreases toward the support portion 28 is provided on the side of the circular hole 32 opposite to the support portion 28 side. When the filter 20 is arranged in the flow path 100 as shown in FIG. 10, the reduced diameter portion 33 is located on the upstream side of the circular hole 32 in the fluid flow direction. Further, the cross-sectional shape of the circular hole 32 of the reduced diameter portion 33 along the central axis CL is an arc shape (specifically, a convex arc shape). Specifically, of the hole wall surface 32A forming the circular hole 32, the hole wall surface corresponding to the reduced diameter portion 33 is curved in an arc shape when viewed in cross section along the central axis CL of the circular hole 32. ..
In the present embodiment, the central axis CL of the circular hole 32 and the tubular axis direction of the mesh body 22 coincide with each other, but the present invention is not limited to this configuration.

As shown in FIGS. 1 and 2, the reduced diameter portion 33 is provided with a plurality of recesses 34 recessed toward the support portion 28 side. As shown in FIG. 2, these recesses 34 are arranged so as to overlap one end portion 22A of the mesh body 22 when the introduction portion 26 is viewed from the side opposite to the support portion 28 (upstream side in the fluid flow direction). .. Specifically, the support portion 28 is provided in the extending direction of the strut portion 30, which will be described in detail later. As shown in FIG. 4, the bottom portion 34A of the recess 34 is a plane extending in a direction orthogonal to the central axis CL of the circular hole 32.

Further, as shown in FIGS. 1 and 10, an annular flange portion 36 protruding from the outer circumference is formed on the downstream side of the introduction portion 26 in the fluid flow direction. The flange portion 36 has a substantially quadrangular cross-sectional shape. Further, the flange portion 36 is sandwiched between the first flow path member 102 and the second flow path member 104 when the filter 20 is arranged in the flow path 100. As a result, the introduction portion 26 is fixed in the flow path 100 via the flange portion 36.
Further, an O-ring 38 for sealing between the flange portion 36 and the first flow path member 102 is placed on the flange portion 36. The O-ring 38 may be mounted on the flange portion 36 by the time the filter 20 is shipped, or may be mounted on the flange portion 36 when the filter 20 is attached to the flow path 100.

As shown in FIGS. 1 and 4, the support portion 28 has a disk shape and has a smaller diameter than the introduction portion 26. Further, the support portion 28 closes the other end portion 22B of the mesh body 22 in the tubular axis direction. Specifically, the other end 22B of the mesh body 22 is embedded in the support 28.

As shown in FIGS. 1 and 3, the pillar portion 30 is a pillar that connects the introduction portion 26 and the support portion 28. The strut portion 30 extends from the introduction portion 26 to the support portion 28. Specifically, the support column portion 30 is inclined in substantially the same direction as the peripheral portion 22C of the mesh body 22 when viewed in cross section along the central axis CL of the circular hole 32. The strut portion 30 is formed of an inner portion 30A arranged inside the mesh body 22 and an outer portion 30B arranged outside the mesh body 22 via the peripheral portion 22C of the mesh body 22. A plurality of column portions 30 (two in the present embodiment) are provided at intervals (equal intervals in the present embodiment) in the circumferential direction of the circular holes 32. With these configurations, the strut portion 30 can support the peripheral portion 22C of the mesh body 22 from the inside and the outside to maintain the shape of the mesh body 22.

Further, as shown in FIG. 4, the strut portion 30 is directed from the end portion 30C on the reduced diameter portion 33 side in the extending direction of the strut portion 30 (in the direction of arrow E in FIG. 4) toward the reduced diameter portion 33. An extending inclined surface 40 is provided. In the inclined surface 40, the distance D from the central axis CL of the circular hole 32 gradually increases toward the reduced diameter portion 33. In other words, in the inclined surface 40, the distance D from the central axis CL of the circular hole 32 gradually decreases toward the downstream in the fluid flow direction. The inclination angle of the inclined surface 40 with respect to the central axis CL is preferably set within the range of 30 degrees to 60 degrees, and most preferably 45 degrees.

Next, a molding die 50 for manufacturing the filter 20 of the present embodiment by insert molding will be described.

As shown in FIGS. 5 and 8, the molding die 50 of the present embodiment has a movable die 52, a fixed die 54, a slider 56, and a slider 58, and the support 24 is in a closed state. Cavity 51 for molding is formed.

As shown in FIGS. 5 to 9, the movable mold 52 is formed with a pin portion 60 for inserting and holding the mesh body 22. Further, around the root of the pin portion 60 of the movable mold 52, a molding convex portion 62 for forming a concave portion 34 in the introduction portion 26 of the support 24 is provided. Further, the top portion 62A of the molding convex portion 62 is a flat surface.

Further, the molding die 50 is provided with a gate 64 for injecting the molten resin into the cavity 51. The gate 64 communicates with the cavity 51A of the cavity 51 that forms the support column 30 of the support 24. Specifically, the gate 64 communicates with the intermediate portion in the longitudinal direction of the cavity portion 51A. In this embodiment, since the support 24 is provided with two support columns 30, the molding die 50 is provided with two gates 64. Here, when the molten resin R is injected from the gate 64 into the cavity portion 51A, the molten resin R flows through the cavity portion 51A to both sides in the extending direction (longitudinal direction), and then the introduction portion 26 of the support 24 is provided. It flows into the cavity portion 51B for molding and the cavity portion 51C for molding the support portion 28, respectively, and is filled in the cavity 51.

Next, a method of manufacturing the filter 20 using the molding die 50 of the present embodiment will be described.

First, a cylindrical mesh body 22 is prepared, and the mesh body 22 is moved to insert the pin portion 60 of the movable type 52 into the mesh body 22. At this time, the mesh body 22 is moved until one end portion 22A in the axial direction comes into contact with the top portion 62A of the molding convex portion 62 of the movable mold 52. Then, the one end portion 22A of the mesh body 22 comes into contact with the top portion 62A of the molding convex portion 62, so that the mesh body 22 is positioned. Next, the mesh body 22 is set in the cavity 51 of the molding die 50 while maintaining the state in which one end portion 22A of the mesh body 22 is in contact with the top portion 62A of the molding convex portion 62.

Next, the molten resin R is injected through the gate 64 into the cavity 51 of the molding die 50 in the closed mold state. The molten resin R injected from the gate 64 into the cavity 51A of the cavity 51 flows through the cavity 51A toward both sides in the extending direction (longitudinal direction), and then flows into the cavity 51B and the cavity 51C, respectively. The cavity 51 is filled. Here, as shown in FIG. 7, since the molded convex portion 62 of the movable mold 52 is located in the extending direction of the cavity portion 51A, when the molten resin R flows from the cavity portion 51A to the cavity portion 51B. Since a portion where the flow path area of the molten resin R rapidly increases is not formed in the cavity 51, turbulence is unlikely to occur in the molten resin R.
The molten resin R flowing through the cavity portion 51A moves through the mesh of the mesh body 22 to form the inner portion 30A and the outer portion 30B of the support column portion 30, respectively.

Then, after the molten resin R in the cavity 51 is cooled and solidified, the molding die 50 is opened and the filter 20 is removed from the pin portion 60. As a result, the production of the filter 20 is completed.

Next, the operation and effect of the filter 20 of the present embodiment will be described.

In the filter 20, the fluid L flowing through the flow path 100 is guided to the inside of the mesh body 22 through the circular hole 32 of the introduction portion 26. When the fluid L guided to the inside of the mesh body 22 passes through the mesh of the mesh body 22, foreign matter is removed by the mesh body 22.

Further, in the filter 20, since the diameter-reduced portion 33 whose diameter gradually decreases toward the support portion 28 is provided on the side opposite to the support portion 28 side of the circular hole 32, the fluid when the fluid L passes through the circular hole 32. Peeling is suppressed. As a result, in the filter 20, the pressure loss at the time of introducing the fluid L can be reduced as compared with, for example, a filter in which the circular hole 32 is provided with a step portion orthogonal to the fluid flow direction.

Further, in the filter 20, the metal mesh body 22 and the resin support 24 are integrated by insert molding. Here, when the filter 20 is manufactured by insert molding, the mesh body 22 is positioned by moving the mesh body 22 until one end portion 22A of the mesh body 22 abuts on the top portion 62A of the molding convex portion 62. By using such a molding die 50, the mesh body 22 can be positioned accurately and the positioning work becomes easy.

Further, in the filter 20, the concave portion 34 is formed in the extending direction of the support column portion 30, in other words, the molded convex portion 62 of the movable mold 52 is located in the extending direction of the cavity portion 51A. Here, as described above, when the molten resin R flows from the cavity portion 51A to the cavity portion 51B, a portion where the flow path area of the molten resin R rapidly increases is not formed in the cavity 51, so that turbulent flow occurs in the molten resin R. It is unlikely to occur. Therefore, the resistance when the molten resin R flows from the cavity portion 51A to the cavity portion 51B can be reduced. As a result, the moldability of the support 24 constituting the filter 20 is improved.

Further, in the filter 20, since the bottom portion 34A of the concave portion 34 is flat, the corresponding portion (top portion 62A) of the molding convex portion 62 for molding the bottom portion 34A of the concave portion 34 is flat. Therefore, when the filter 20 is manufactured by insert molding, the mesh body 22 can be stably positioned.

Further, in the filter 20, since the diameter of the mesh body 22 is gradually reduced from the one end portion 22A toward the other end portion 22B, the fluid L is smaller than, for example, as compared with a filter having a constant diameter of the mesh body 22. It can pass through the mesh body smoothly. Specifically, in the filter 20, since the peripheral portion 22C is inclined with respect to the tubular axis direction, the fluid L can pass through the peripheral portion 22C before being diverted by the support portion 28. Therefore, the resistance acting on the fluid L when passing through the filter 20 is reduced. Therefore, according to the filter 20, the pressure loss of the fluid L passing through the inside can be reduced.

Further, in the filter 20, the strut portion 30 extends from the end portion 30C on the reduced diameter portion 33 side of the strut portion 30 toward the reduced diameter portion 33 and from the central axis CL of the circular hole 32 toward the reduced diameter portion 33. An inclined surface 40 is provided so that the distance D gradually increases. Therefore, in the filter 20, it is possible to prevent the flow of the fluid L passing through the circular hole 32 from being obstructed by the support column portion 30. In other words, the pressure loss due to the support column 30 of the fluid L passing through the circular hole 32 can be reduced.

Further, in the filter 20, since the cross-sectional shape of the circular hole 32 of the reduced diameter portion 33 along the central axis CL is arcuate, the pressure loss of the fluid L passing through the circular hole 32 can be further reduced.

Further, in the filter 20, a flange portion 36 is provided on the downstream side of the introduction portion 26 in the fluid flow direction FD, and an O-ring 38 is placed on the flange portion 36. As a result, in the filter 20, the flange portion 36 is sandwiched between the first flow path member 102 and the second flow path member 104, so that the gap between the first flow path member 102 and the flange portion 36 is sealed by the O-ring 38. Will be done.

In the filter 20 of the above-described embodiment, the cross-sectional shape of the circular hole 32 of the reduced diameter portion 33 along the central axis CL is an arc shape (specifically, a convex arc shape), but the present invention is limited to this configuration. Not done. For example, as in the filter 70 shown in FIG. 11, the cross-sectional shape of the reduced diameter portion 73 formed in the circular hole 72 along the central axis CL extends linearly along the direction inclined with respect to the central axis CL. It may be in shape. Similar to the filter 20, the reduced diameter portion 73 of the filter 70 is also provided with a recess 74 in the extending direction of the strut portion 30.

In the filter 20 of the above-described embodiment, the mesh body 22 is made of metal, but the present invention is not limited to this configuration. For example, the mesh body 22 may be made of resin. As the resin forming the mesh body 22, a thermoplastic resin may be used, or a thermosetting resin may be used. When a thermoplastic resin is used as the resin of the mesh body, it is preferable to use a resin having a melting point higher than that of the resin forming the support 24.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be modified in various ways other than the above within a range not deviating from the gist thereof. Of course.

20 Filter 22 Mesh body 22A One end 22B Other end 24 Support 26 Introduction 28 Support 30 Strut 32 Circular hole 33 Reduced diameter 34 Recess 34A Bottom 36 Flange 38 O-ring 40 Inclined surface 70 Filter 72 Circular hole 73 Reduced diameter part 74 Recessed 100 Flow path 102 1st flow path member 104 2nd flow path member CL Central axis D Distance E Extension direction FD Flow direction L Fluid X Cylindrical axis direction

Claims (6)

A mesh body that is cylindrical and is arranged in the flow path so that one end in the tubular axis direction is located upstream of the other end in the fluid flow direction.
A support that is fixed in the flow path, closes one end of the mesh body, has an introduction portion provided with a circular hole for guiding a fluid inside the mesh body, and closes the other end of the mesh body. A plurality of columns extending from the introduction portion to the support portion and provided at intervals in the circumferential direction of the circular hole, connecting the introduction portion and the support portion, and maintaining the shape of the mesh body. A resin support having a portion and integrated with the mesh body,
With
On the side of the circular hole opposite to the support portion side, a diameter reduction portion whose diameter gradually decreases toward the support portion is provided.
A filter in which a recess is provided in the reduced diameter portion in the extending direction of the strut portion. The filter according to claim 1, wherein the bottom of the recess is flat. The filter according to claim 1 or 2, wherein the diameter of the mesh body gradually decreases from one end to the other end. The strut portion has an inclined surface that extends from the end portion of the strut portion on the reduced diameter portion side toward the reduced diameter portion and gradually increases the distance from the central axis of the circular hole toward the reduced diameter portion. The filter according to any one of claims 1 to 3, which is provided. The filter according to any one of claims 1 to 4, wherein the cross-sectional shape of the reduced diameter portion along the central axis of the circular hole is arcuate. The flow path is composed of a first flow path member and a second flow path member located downstream of the first flow path member in the flow direction.
On the downstream side of the introduction portion in the flow direction, a flange portion that projects from the outer circumference and is sandwiched between the first flow path member and the second flow path member is provided.
The filter according to any one of claims 1 to 5, wherein an O-ring for sealing between the flange portion and the first flow path member is placed.