JP2006305979A - Method of manufacturing filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent shaping strength of a filter frame from being decreased by exposure of an outer circumferential edge margin 14 of a sheet-like mesh 4 to the surface of the filter frame due to a flow of a resin material and resin pressure. <P>SOLUTION: Even when the outer circumferential edge margin 14 of the sheet-like mesh 4 is pressed by the flow of the resin material and resin pressure toward the surface of the filter frame in a case of molding a resin into the filter frame for enhancing stiffness of the mesh filter, since the first protrusion 57 mounted on the upper mold and the second protrusion 57 mounted on the lower mold, both molds for molding the resin into the filter frame, press down the outer circumferential edge margin 14 of the sheet-like mesh 4 from both edges of the sheet-like mesh 4 in the thickness direction, the outer circumferential edge margin 14 of the sheet-like mesh 4 can not move to the right surface side or the reverse surface side of the filter frame. Thus, since the outer circumferential edge margin 14 of the sheet-like mesh 4 is prevented from being exposed to the right surface side or the reverse surface side of the filter frame, the molding strength of the filter frame is not decreased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a filter for removing foreign matters mixed in a fluid such as a gas such as air or evaporative fuel, or a liquid such as fuel, hydraulic oil, lubricating oil, oil or water. The present invention relates to a method for manufacturing a mesh filter by integrally molding a sheet-like mesh made of fiber, chemically synthesized fiber, or the like and an outer frame portion that covers and protects the peripheral edge of the sheet-like mesh.

[Conventional technology]
2. Description of the Related Art Conventionally, a manufacturing apparatus that manufactures a filter gasket by integrating a sheet-like mesh made of metal fiber or chemically synthetic fiber and a gasket main body made of a rubber-like elastic material has been proposed (for example, see Patent Document 1). This is because a cavity for molding a gasket main body (outer frame part) made of a rubber-like elastic material is provided in a parting part of a molding die, and a pair of upper and lower parts for holding a sheet-like mesh in this cavity. A mesh pressing portion is provided, and each mesh pressing portion is formed of an elastic material such as resin or rubber. When the sheet mesh is pressed from both sides by the mesh pressing portion of the mold, the sheet mesh is elastically deformed according to the magnitude of the pressing force and closely contacts the sheet mesh along the stitches of the sheet mesh. In addition, the occurrence of a gap (gap formed at the intersection of the meridian and the latitude) due to the stitches of the sheet-like mesh is suppressed.

[Conventional technical problems]
However, in the above-described conventional technology, it is possible to suppress the occurrence of a gap due to the stitches of the sheet-like mesh when the sheet-like mesh is held by the mesh holding portion of the forming die. Since the peripheral edge of the mesh mesh cannot be directly pressed by the molding die, for example, as shown in FIG. The peripheral edge 102 is biased and fibers are exposed on the surface of the outer frame portion 103. Thereby, the mesh is biased or the fibers fray at the boundary between the peripheral edge of the sheet-like mesh and the outer frame portion. In addition, the sealing performance between the outer frame portion and the fixing portion of the filter gasket is deteriorated due to poor dimensional accuracy of the outer frame portion, and the molding strength of the outer frame portion is lowered.
JP 2002-102619 A (page 1-4, FIG. 1 to FIG. 7)

  The objective of this invention is providing the manufacturing method of the filter which can prevent that the peripheral edge of a filtration element is exposed to the surface of an outer frame part by the flow and shaping | molding pressure of the molding material at the time of shaping | molding. Moreover, it is providing the manufacturing method of the filter which can prevent the fall of a sealing performance and the fall of the shaping | molding intensity | strength of an outer frame part.

  According to the first aspect of the present invention, the outer frame portion is molded even when the peripheral edge of the filter element tends to approach the surface of the outer frame portion due to the flow and molding pressure of the molding material when the outer frame portion is molded. Since the element pressing portion of the mold presses the peripheral edge of the filtration element from both sides in the plate thickness direction of the filtration element, the peripheral edge of the filtration element cannot move to the surface side of the outer frame portion. This prevents the peripheral edge of the filter element from being exposed to the surface of the outer frame part due to the flow and molding pressure of the molding material at the time of molding, thus reducing the sealing performance and the molding strength of the outer frame part. Can be prevented.

  According to the invention described in claim 2, by arranging a plurality of element pressing portions in a direction substantially orthogonal to the plate thickness direction of the filter element, the entire peripheral edge of the filter element is made to have a plate thickness of the filter element. Can be pressed evenly from both sides of the direction. According to the invention described in claim 3, the molding die for molding the outer frame portion is constituted by at least the upper die and the lower die, and the element pressing portion is provided with the plurality of first protrusions provided on the upper die side. You may comprise by a part and several 2nd convex part provided in a lower mold | type side.

  According to the fourth aspect of the invention, the plurality of first protrusions and the plurality of second protrusions are alternately repeated at different positions in the direction substantially orthogonal to the plate thickness direction of the filtration element. By arranging a plurality of first protrusions and a plurality of second protrusions, the number of first protrusions and the number of second protrusions in a direction substantially orthogonal to the plate thickness direction of the filter element Since the element pressing portions can be provided at a predetermined interval, for example, by the number obtained by adding the above, the amount of movement of the peripheral edge of the filter element toward the surface side of the outer frame portion can be suppressed small.

  According to the fifth aspect of the present invention, the plurality of first convex portions and the plurality of second convex portions are arranged at the same position in the direction substantially orthogonal to the plate thickness direction of the filtration element. Since the plurality of first convex portions and the plurality of second convex portions are arranged so as to face each other, the peripheral edge of the filtration element can be reliably pressed from both sides in the plate thickness direction of the filtration element. The amount of movement of the peripheral edge of the filtration element to the surface side of the outer frame portion can be kept small.

  According to the invention of claim 6, a filter having an outer frame portion of a predetermined product shape can be manufactured by filling the molding material into the cavity of the mold and molding the outer frame portion. . Moreover, according to the invention of Claim 7, the product-shaped filter which insert-molded the filtration element in the inside of an outer frame part can be manufactured by shape | molding an outer frame part.

  The best mode for carrying out the present invention is to prevent the peripheral edge of the filtration element from being exposed to the surface of the outer frame portion due to the flow and molding pressure of the molding material during molding, and to reduce the sealing performance. For the purpose of preventing the molding strength of the outer frame part from being reduced, an element pressing part that presses the peripheral edge of the filtration element from both sides in the thickness direction of the filtration element is provided in the mold for molding the outer frame part. Realized.

[Configuration of Example 1]
FIGS. 1 to 3 show Example 1 of the present invention. FIG. 1 is a diagram showing a main structure of a mold for manufacturing a mesh filter, and FIG. 2 is a diagram showing a mesh filter.

  As shown in FIG. 3, the filter device of this embodiment is a filter device for a solenoid valve in which a fluid passage 2 is formed inside a housing 1 of a solenoid valve, and a mesh filter 3 is disposed in the middle of the fluid passage 2. is there. Here, the solenoid valve introduces (purges) a fluid such as evaporated fuel evaporated in a fuel tank of a vehicle such as an automobile into the engine intake pipe through the canister using the intake pipe negative pressure. Thus, it is incorporated in an evaporative fuel processing apparatus that prevents a fluid such as evaporative fuel from being released into the atmosphere. The electromagnetic valve is installed in the middle of the purge passage connecting the canister and the engine intake pipe, and the amount of fluid such as evaporated fuel adsorbed by the adsorbent (for example, activated carbon) in the canister is introduced into the engine intake pipe. Functions as an electromagnetic fluid flow control valve (purge VSV: vacuum switching valve).

  In addition, the electromagnetic valve is configured to open and close a valve hole provided in the middle of the fluid passage 2 by being seated and separated from the valve seat of the housing 1, and a valve opening direction (valve hole). A solenoid coil that generates a magnetic attractive force that attracts in the valve closing direction (the side that closes the valve hole), an electromagnetic drive unit having a movable core and a fixed core magnetized by the magnetomotive force of the solenoid coil, and a valve Valve body urging means such as a spring (not shown) that generates an urging force (load) that urges the body in the valve closing direction (the valve hole closing side) or the valve opening direction (the valve hole opening side) The mesh filter 3 is installed in the fluid passage 2 upstream of the valve hole in the fluid flow direction. Note that the valve body urging means may not be provided.

  The housing 1 is formed of a resin material, and has a filter holding frame (frame) that forms a substantially square filter housing space therein. As shown in FIG. 3, the housing 1 includes linear first and second fitting grooves (concave fitting portions) that are parallel to a direction perpendicular to the fluid flow direction on the passage wall surface of the fluid passage 2. , Concave grooves) 11 and 12. The pair of first and second fitting grooves 11 and 12 are disposed to face each other with the filter housing space interposed therebetween.

  The mesh filter 3 includes a substantially rectangular filter element (mesh sheet: hereinafter referred to as a sheet mesh) 4 for filtering a fluid (for example, air or evaporated fuel) flowing in the fluid passage 2, and the sheet mesh 4. It is constituted by a substantially rectangular outer frame portion (frame body: hereinafter referred to as a filter frame) 5 which covers and protects the outer peripheral edge.

  The sheet-like mesh 4 is a filter element that captures and cleans foreign matters mixed in the fluid toward the valve part of the solenoid valve and the movable part side of the solenoid valve, and is made of a thin wire material such as metal fiber or chemically synthesized fiber. It is knitted into a mesh shape (lattice shape). The sheet-like mesh 4 includes a substantially rectangular exposed portion (filtering portion) 13 exposed at an air passage opening (described later) of the filter frame 5 and a rectangular annular outer periphery provided so as to surround the exposed portion 13. It has an edge 14. The outer peripheral edge 14 is insert-molded in the filter frame 5. The sheet-like mesh 4 may be formed of, for example, a polyamide resin (PA) foam net or a metal net.

  The filter frame 5 is a frame body that is integrally molded with a resin material (for example, polypropylene: PP) and increases the rigidity of the mesh filter 3. Further, the filter frame 5 is provided with an angular ring portion 15 having a parallel set of opposite sides (short side, left and right sides in the drawing) and a parallel set of opposite sides (long side, upper and lower sides in the drawing). Inside the rectangular annular portion 15, a transfer portion (single-shaped bar) 16 is suspended over the upper and lower sides of the rectangular annular portion 15 in the figure. Note that the upper and lower end portions (root portions) of the transfer portion 16 are larger in diameter than the center portion. Further, two or more fluid passage openings (openings, windows) 17 through which fluid passes are provided inside the filter frame 5, and the exposed portion 13 of the sheet-like mesh 4 is provided at these fluid passage openings 17. Is exposed. Moreover, although the corner | angular part of the some fluid passage port 17 is formed in circular arc shape, you may form it at right angle. Further, on the right and left sides of the rectangular annular portion 15 of the filter frame 5, first and second fitting portions (convex fittings) that are inserted and fitted into the first and second fitting grooves 11 and 12 of the housing 1. Joint portions) 21 and 22 are formed.

  Then, the outer peripheral edge 14 of the sheet-like mesh 4 is connected to the fluid passage port side of the rectangular annular portion 15 of the filter frame 5 (for example, the vicinity of the root portion of the transfer portion 16 and the opening edge portion of the fluid passage port 17). A mesh pressing portion that can be pressed from both sides in the thickness direction of the mesh 4 is provided. The mesh pressing portion includes a plurality of first recesses 31 to 31 that press the outer peripheral edge 14 of the sheet-like mesh 4 from one side (surface side, upstream in the fluid flow direction) of the sheet-like mesh 4 in the plate thickness direction. 36 and a plurality of second concave portions 41 to 46 that hold the outer peripheral edge 14 of the sheet-like mesh 4 from the other side in the plate thickness direction of the sheet-like mesh 4 (the back side, the downstream side in the fluid flow direction). is doing.

  The plurality of first concave portions 31 to 36 and the plurality of second concave portions 41 to 46 surround the exposed portion 13 of the sheet-like mesh 4, that is, the plate of the sheet-like mesh 4 so as to surround the fluid passage port 17. They are alternately arranged at predetermined intervals (equal intervals or irregular intervals) in a direction orthogonal to the thickness direction. The plurality of first recesses 31, 32 are provided on the fluid passage port side (opening edge portion) from the left and right sides of the rectangular ring portion 15 of the filter frame 5 in the figure. Further, the first concave portions 31 and 32 are provided in a substantially rectangular shape so as to be recessed from the surface of the angular annular portion 15 of the filter frame 5 to the sheet-like mesh side. The plurality of first recesses 33 and 34 are provided on the fluid passage opening side (opening edge portion) from the upper and lower sides of the rectangular annular portion 15 of the filter frame 5 in the figure. The first recesses 33 and 34 are provided in a substantially rectangular shape so as to be recessed from the surface of the square annular portion 15 of the filter frame 5 to the sheet-like mesh side by four. The first recesses 35 and 36 are provided on the base side of the transfer portion 16 with respect to the upper and lower sides of the rectangular annular portion 15 of the filter frame 5 in the drawing. The first recesses 35 and 36 are each provided in a rectangular shape so as to be recessed one by one from the surface of the rectangular ring portion 15 of the filter frame 5 to the sheet-like mesh side.

  The plurality of second concave portions 41 and 42 are provided on the fluid passage port side (opening edge portion) from the left and right sides of the rectangular annular portion 15 of the filter frame 5 in the figure. Further, the second concave portions 41 and 42 are provided in a substantially rectangular shape so as to be recessed from the back surface of the square annular portion 15 of the filter frame 5 to the sheet-like mesh side. The plurality of second concave portions 43 and 44 are provided on the fluid passage port side (opening edge portion) with respect to the upper and lower sides of the rectangular annular portion 15 of the filter frame 5 in the drawing. In addition, each of the second recesses 43 and 44 is provided in a substantially rectangular shape so as to be recessed from the back surface of the square annular portion 15 of the filter frame 5 to the sheet-like mesh side. The plurality of second recesses 45 and 46 are provided on the fluid passage opening side (opening edge portion) with respect to the apex where the illustrated left and right sides of the rectangular annular portion 15 of the filter frame 5 intersect with the illustrated upper and lower sides. . Also, two second recesses 45 and 46 are provided on each of the corners (arc-shaped portions) on the left and right sides of the fluid passage port 17 on the left and right sides in the drawing from the back surface of the square annular portion 15 of the filter frame 5 to the sheet-like mesh side. It is provided in a substantially rectangular shape so as to be recessed.

  It should be noted that the plurality of first recesses 31 to 36 and the plurality of second recesses 41 to 46 are more than the illustrated left and right sides (first and second fitting portions 21 and 22) and the illustrated upper and lower sides of the rectangular annular portion 15. Since it is provided on the fluid passage port side, it is located on the fluid passage side with respect to the first and second fitting grooves 11 and 12 of the housing 1, and with the first and second fitting grooves 11 and 12 of the housing 1. No gap is formed between them, and there is no influence on the sealing performance.

[Production Method of Example 1]
Next, the injection molding method of the filter frame 5 of the mesh filter 3 of the present embodiment will be briefly described with reference to FIG.

  Molds for integrally forming the filter frame 5 with resin (resin molding mold, injection mold) are mainly an upper mold (fixed mold or movable mold) 6 and a lower mold (movable mold or fixed mold). 7. A lower end surface (lower end surface in the drawing) 51 of the upper die 6 is located on the upper side in the drawing about half the plate thickness of the filter frame 5 with respect to the surface of the sheet-like mesh 4, and an upper end surface (upper end surface in the drawing) 52 of the lower die 7. Is located on the lower side in the figure about half the plate thickness of the filter frame 5 from the back surface of the sheet-like mesh 4. Further, between the lower end surface 51 of the upper die 6 and the upper end surface 52 of the lower die 7, there is a shape corresponding to the product shape of the mesh filter 3, particularly the product shape of the filter frame 5 when the mold is clamped. A cavity 53 is formed.

  The cavity 53 is connected to a resin material supply device that supplies a resin material (molding material) to the inside of the mold. In this resin material supply device, a resin material that is heated and melted (for example, a molten resin made of a thermoplastic resin such as PP) is introduced into the cavity 53 at the tip of a resin flow path that feeds the resin material into the mold. It has a gate (resin material inlet, molding material inlet) for injection. The gate is formed on either the front side or the back side of the filter frame 5 or on both sides.

  Here, since the sheet-like mesh 4 is an insert part that is insert-molded inside the filter frame 5, the sheet-like mesh 4 is inserted into the mold in advance before the resin molding of the filter frame 5 is started. Is retained. That is, the sheet-like mesh 4 is formed by a mesh pressing portion provided so as to bulge (protrude) from the lower end surface 51 and the upper end surface 52 of the forming die toward the sheet-like mesh when the forming die is clamped. 4 is held between the upper mold 6 and the lower mold 7 by pressing the exposed portion 13 and the outer peripheral edge 14 from both sides of the sheet mesh 4 in the plate thickness direction.

  The mesh press part of a present Example consists of an exposure side mesh press part (1st mesh press part) and an edge side mesh press part (a 1st mesh press part, an element press part). The exposed-side mesh pressing portion includes a convex block portion (first block portion) 54 provided on the lower end surface 51 of the upper die 6 and a convex block portion (second block) provided on the upper end surface 52 of the lower die 7. Part) 55. The first block portion 54 has a rectangular shape corresponding to the fluid passage port 17 of the filter frame 5, and the exposed portion of the sheet-like mesh 4 from the lower end surface 51 that forms the surfaces of the angular annular portion 15 and the transfer portion 16 of the filter frame 5. It protrudes like a boss by a distance to the surface of 13 (about half of the thickness of the mesh filter 3). Further, the second block portion 55 has a square shape corresponding to the fluid passage port 17 of the filter frame 5, and is formed from the upper end surface 52 that forms the back surface of the angular annular portion 15 and the transfer portion 16 of the filter frame 5. It protrudes in a boss shape by a distance to the back surface of the exposed portion 13 (about half the thickness of the mesh filter 3). In addition, you may form the 1st, 2nd blocks 54 and 55 with a rubber-type elastic material.

  The edge side mesh pressing portion has a plurality of convex portions (first convex portions) 56 provided on the upper mold side and a plurality of convex portions (second convex portions) 57 provided on the lower mold side. . The first and second convex portions 56 and 57 have a distal end surface shape that is rectangular or square and a cross-sectional shape that is trapezoidal or square. The plurality of first and second convex portions 56 and 57 are arranged at a predetermined interval (equal interval or irregular interval) so as to surround the exposed portion 13 of the sheet-like mesh 4, that is, so as to surround the fluid passage port 17. Is arranged in. The plurality of first and second convex portions 56 and 57 are arranged at different positions in the direction orthogonal to the sheet thickness direction of the sheet-like mesh 4 and the plurality of first convex portions 56 and the plurality of second convex portions. The plurality of first protrusions 56 and the plurality of second protrusions are arranged so that the plurality of first protrusions 56 and the plurality of second protrusions 57 are alternately repeated. The parts 57 are arranged alternately. In addition, you may form the 1st, 2nd convex parts 56 and 57 with a rubber-type elastic material.

  The plurality of first convex portions 56 are distances from the lower end surface 51 that forms the surface of the angular annular portion 15 of the filter frame 5 to the surface of the outer peripheral edge 14 of the sheet-like mesh 4 (plate thickness of the mesh filter 3). The outer peripheral edge 14 of the sheet-like mesh 4 is pressed from one side (surface side, upstream in the fluid flow direction) of the sheet-like mesh 4. Further, the plurality of second convex portions 57 are distances from the upper end surface 52 that forms the back surface of the angular annular portion 15 of the filter frame 5 to the back surface of the outer peripheral edge 14 of the sheet mesh 4 (the mesh filter 3). The outer peripheral edge 14 of the sheet-like mesh 4 is pressed from the other side in the plate-thickness direction of the sheet-like mesh 4 (the back side, the downstream side in the fluid flow direction).

  First, the mold is clamped (clamping process). At this time, by inserting the sheet-like mesh 4 manufactured in a predetermined shape (substantially square shape) into the cavity 53 formed by the mold, the exposed-side mesh pressing portion and the edge-side mesh pressing portion. Thus, the exposed portion 13 and the outer peripheral edge 14 of the sheet-like mesh 4 are pressed from both sides of the sheet-like mesh 4 in the plate thickness direction. Next, a heated and molten resin material is injected into the cavity 53 formed by the mold. Thereby, the resin material is injected from the gate, and the resin material is filled into the cavity 53 (injection / filling step).

  Next, the resin pressure is gradually increased to hold the pressure at a resin pressure larger than the resin pressure at the time of injection. That is, a predetermined pressure is applied to the resin material, cooling water is introduced into the mold, and the resin material for shrinkage due to the cooling water is replenished into the cavity 53 from the gate (pressure holding step). Therefore, the resin material injected from the gate into the cavity 53 wraps around so as to fill the entire cavity 53. At this time, a part of the resin material flows between the plurality of first convex portions 56 and the surface of the outer peripheral edge 14 of the sheet-like mesh 4, and the plurality of second convex portions 57 and the sheet-like mesh. 4 flows between the outer peripheral edge 14 and the back surface of the outer peripheral edge 14.

  Next, the resin material filled in the cavity 53 is taken out and cooled and cured (solidified), or the resin material is cooled and cooled (cooled) using cooling water or the like in the mold, A substantially square (product shape) mesh filter 3 in which a sheet-like mesh 4 is insert-molded inside the filter frame 5 is manufactured by injection molding of a resin material (see FIG. 2). Note that the portion of the sheet mesh 4 pressed from both sides in the plate thickness direction by the first block portion 54 of the upper die 6 and the second block portion 55 of the lower die 7, that is, the inside of the angular annular portion 15 of the filter frame 5. A plurality of fluid passage ports 17 are formed on both sides of the transfer portion 16. Further, the first and second convex portions 56 and 57 of the edge side mesh pressing portion are pressed from both sides in the thickness direction of the sheet-like mesh 4, that is, on the front and back surfaces of the angular annular portion 15 of the filter frame 5. The plurality of first recesses 31 to 36 and the plurality of second recesses 41 to 46 are alternately formed in a direction perpendicular to the sheet thickness direction of the sheet-like mesh 4.

  Here, in this embodiment, the mesh filter 3 has a cross-sectional shape that is parallel to a direction substantially orthogonal to the flow direction of the fluid flowing through the fluid passage 2. The mesh filter 3 having a shape in which the cross-sectional shape of 3 is convexly curved upstream in the flow direction of the fluid flowing through the fluid passage 2 may be manufactured. In this case, the rigidity of the convex curved surface of the mesh filter 3 is higher than the external force (fluid pressure) applied from the upstream side in the fluid flow direction. This prevents deformation such as the convex curved surface of the mesh filter 3 being dented downstream in the fluid flow direction due to the fluid pressure applied to the convex curved surface of the mesh filter 3 from the upstream side in the fluid flow direction. Can do. In addition, the right and left sides (first and second fitting portions 21 and 22) of the rectangular annular portion 15 of the filter frame 5 of the mesh filter 3 are difficult to come off from the first and second fitting grooves 11 and 12 of the housing 1. . Thereby, the sealing performance between the bottom surfaces of the first and second fitting grooves 11 and 12 of the housing 1 and the first and second fitting portions 21 and 22 of the filter frame 5 of the mesh filter 3 can be improved. it can.

[Operation of Example 1]
Next, the operation of the mesh filter 3 of this embodiment will be briefly described with reference to FIG.

  When the solenoid valve is opened, foreign matter mixed in the fluid directed to the valve portion of the solenoid valve and the movable portion of the solenoid valve is captured by the sheet-like mesh 4 of the mesh filter 3. This makes it difficult for foreign matter mixed in the fluid to enter the valve hole of the electromagnetic valve or the sliding portion of the electromagnetic drive unit (the sliding portion of the movable core and the fixed core). The sealing performance with the valve seat provided in the valve seat 1 is not deteriorated, and the operation failure or the fixing failure of the movable part of the electromagnetic valve (for example, the movable core of the valve body or the electromagnetic drive part) does not occur.

[Effect of Example 1]
As described above, it is formed between the lower end surface 51 of the upper mold 6 and the upper end surface 52 of the lower mold 7 during the resin molding of the filter frame 5 for increasing the rigidity of the mesh filter 3 of the present embodiment. The outer peripheral edge 14 of the sheet-like mesh 4 is formed in a square ring shape of the filter frame 5 by the flow of resin material injected into the cavity 53 having a shape corresponding to the product shape of the filter frame 5 and the resin pressure. Even when trying to approach the front surface (or back surface) of the part 15, the first convex part 56 of the upper mold 6 and the second convex part 57 of the lower mold 7 for resin molding the filter frame 5 are formed into a sheet-like mesh. 4, the outer peripheral edge 14 of the sheet-like mesh 4 is pressed from both sides in the plate thickness direction, so that the outer peripheral edge 14 of the sheet-like mesh 4 is on the front surface side (or the back surface side) of the angular annular portion 15 of the filter frame 5. I can't move.

  As a result, it is possible to prevent the outer peripheral edge 14 of the sheet-like mesh 4 from being exposed to the front surface (or back surface) of the angular annular portion 15 of the filter frame 5 due to the flow of resin material and the resin pressure during resin molding. At the boundary between the outer peripheral edge 14 of the mesh 4 and the angular annular portion 15 of the filter frame 5, the mesh is not biased, and the wire material such as metal fiber or chemically synthesized fiber is not frayed. In addition, the first and second fitting grooves 11 and 12 of the housing 1 and the right and left sides of the square annular portion 15 of the filter frame 5 (first and second fittings) due to poor dimensional accuracy of the angular annular portion 15 of the filter frame 5. It is possible to prevent a decrease in the sealing performance between the portions 21 and 22) and to prevent a decrease in the molding strength of the angular annular portion 15 of the filter frame 5 necessary for increasing the rigidity of the mesh filter 3. it can.

  In addition, a plurality of first protrusions 56 and a plurality of second protrusions 57 are arranged at different positions in the direction orthogonal to the sheet thickness direction of the sheet mesh 4, and the plurality of first protrusions The plurality of first protrusions 56 and the plurality of second protrusions 57 are alternately staggered at predetermined intervals (equal intervals or irregularly) so that the portions 56 and the plurality of second protrusions 57 are alternately repeated. (Interval). Thereby, the 2nd convex part 57 is arrange | positioned between the two 1st convex parts 56 adjacently provided (for example, the intermediate position of the two 1st convex parts 56 adjacently provided), and 2nd 2nd adjacently provided. The 1st convex part 56 is arrange | positioned between the convex parts 57 (for example, the intermediate position of the two 2nd convex parts 57 adjacently provided).

  Therefore, for example, the edge side mesh at a predetermined interval by the number obtained by adding the number of the first protrusions 56 and the number of the second protrusions 57 in the direction orthogonal to the plate thickness direction of the sheet-like mesh 4. Since the pressing portion can be provided, the distance between the first and second convex portions 56 and 57 of the mold (the convex portion interval) can be shortened. Thereby, the moving amount | distance of the outer periphery edge 14 of the sheet-like mesh 4 to the surface side (or back surface side) of the square annular part 15 of the filter frame 5 can be restrained small. Further, the sheet-like mesh is not held by the outer peripheral edge 14 of the sheet-like mesh 4 by a small-sized convex part or only one convex part in a direction orthogonal to the thickness direction of the sheet-like mesh 4. The outer peripheral edge 14 of the sheet-like mesh 4 is pressed by the first convex portions 56 of the upper mold 6 and the second convex portions 57 of the lower mold 7 that are alternately arranged in a direction orthogonal to the thickness direction of the sheet 4. As a result, the deviation of the outer peripheral edge 14 of the sheet-like mesh 4 in the vicinity of the first and second convex portions 56 and 57 can be reliably prevented.

  FIG. 4 shows a second embodiment of the present invention and shows a mesh filter.

  In the present embodiment, the plurality of first protrusions 56 provided on the upper mold side and the plurality of second protrusions 57 provided on the lower mold side are orthogonal to the plate thickness direction of the sheet-like mesh 4. The plurality of first convex portions 56 and the plurality of second convex portions 57 are disposed so as to face each other through the outer peripheral edge 14 of the sheet-like mesh 4. . As a result, a plurality of first concave portions 31 to 36 and a plurality of second concave portions 41 to 46 are formed at the same position on the front and back surfaces of the rectangular annular portion 15 of the filter frame 5 so as to face each other. The second recesses 45 and 46 are arranged at the same position so as to face the first recesses 35 and 36.

  As described above, the first and second convex portions 56 and 57 may be provided at the same position in the direction orthogonal to the plate thickness direction of the sheet-like mesh 4 if there is no problem in the resin molding of the filter frame 5. . In this case, the outer peripheral edge 14 of the sheet-like mesh 4 can be reliably pressed from both sides in the thickness direction of the sheet-like mesh 4, so that the front side (or the back side) of the angular annular portion 15 of the filter frame 5. The amount of movement of the outer peripheral edge 14 of the sheet-like mesh 4 can be kept small.

[Modification]
In the present embodiment, the filter device of the present invention is applied to a filter device (solenoid valve) for a solenoid valve incorporated in an evaporative fuel treatment device of a vehicle such as an automobile. However, the present invention is not limited to this. The present invention may be applied to an electromagnetic fluid flow control valve, an electromagnetic fluid pressure control valve, and an electromagnetic on-off valve. Further, the present invention may be applied to an electric fluid flow control valve, an electric fluid pressure control valve, and an electric on-off valve. The fluid passing through the sheet mesh 4 in the plate thickness direction is not limited to gas such as air (air) or evaporated fuel, but also gas such as gas phase refrigerant, water, fuel, oil, liquid phase refrigerant, etc. Liquid or gas-liquid two-phase fluid can be used.

  In this embodiment, the sheet-like mesh filter 3 having rigidity is adopted as the filter. However, a sheet-like mesh filter having flexibility may be adopted as the filter, and a bellows-like filter is also adopted. You may do it. The filter element may be constituted by a bellows-like filter element (filter paper, fiber, etc.), or may be constituted by a thin mesh (network or honeycomb) sheet. Moreover, you may form a filtration element with a metal material or a resin material. Also, the filter frame (outer frame part) is made of a rectangular or annular part and a transfer part (lattice-like part, cross-shaped cross, or single-piece cross) located inside the square annular part integrated with a metal material or a resin material. It may be formed automatically. Further, the filter frame may be composed of only an angular ring portion.

  In this embodiment, the filter frame 5 of the mesh filter 3 is formed of a resin material, but the filter frame 5 of the mesh filter 3 may be formed of a rubber-based elastic material. Further, the shape of the filter frame 5 of the sheet-like mesh 4 (front shape when viewed from the upstream side in the fluid flow direction, front side shape when the upstream side surface in the fluid flow direction is the front surface, and the downstream side surface in the fluid flow direction as the rear surface In this case, the rear surface shape) is a shape including at least two parallel sides (opposite sides) (for example, a substantially oval shape, a substantially trapezoidal shape, a substantially parallelogram shape, etc.). The first and second fitting grooves 11 and 12 may be inserted and fitted respectively.

It is sectional drawing which showed the main structures of the shaping | molding die (Example 1). (A) is the front view which showed the mesh filter, (b) is AA sectional drawing of (a) (Example 1). (A), (b) is sectional drawing which showed the state which assembled | attached the mesh filter inside the housing (Example 1). (A) is the front view which showed the mesh filter, (b) is BB sectional drawing of (a) (Example 2). (A) is the front view which showed the mesh filter, (b), (c) is sectional drawing which showed the mesh filter (conventional technique).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Fluid passage 3 Mesh filter 4 Sheet-like mesh (filtration element)
5 Filter frame (outer frame)
6 Upper mold (molding mold)
7 Lower mold (mold)
DESCRIPTION OF SYMBOLS 11 1st fitting groove of housing 12 2nd fitting groove of housing 13 Exposed part of sheet-like mesh 14 Outer peripheral edge of sheet-like mesh 15 Square annular part of filter frame 16 Filter frame passing part 17 Fluid passage of filter frame Port 21 First fitting portion of filter frame 22 Second fitting portion of filter frame 31 First concave portion of filter frame 32 First concave portion of filter frame 33 First concave portion of filter frame 34 First concave portion of filter frame 35 Filter frame The first concave portion of the filter frame 41 The second concave portion of the filter frame 42 The second concave portion of the filter frame 43 The second concave portion of the filter frame 44 The second concave portion of the filter frame 45 The second concave portion of the filter frame 46 Second concave portion 51 Lower end surface of upper die 52 Upper end surface of lower die 53 Cavity 54 First block portion of upper die (exposed-side mesh pressing portion)
55 Lower block second block (exposed-side mesh retainer)
56 Upper mold first convex part (first convex part, edge side mesh pressing part)
57 Second convex part of the lower mold (second convex part, edge side mesh pressing part)

Claims (7)

A method for producing a filter in which a plate-like or sheet-like filtration element for filtering a fluid passing in the plate thickness direction and an outer frame portion covering a peripheral edge of the filtration element are integrated,
Insert the filtration element into the mold for molding the outer frame part,
In the manufacturing method of the filter that molds the outer frame part in a state where the filtration element is pressed by the mold,
The said shaping | molding die has the element holding | suppressing part which presses the peripheral edge of the said filtration element from the both sides of the plate | board thickness direction of the said filtration element, The manufacturing method of the filter characterized by the above-mentioned. In the manufacturing method of the filter of Claim 1,
A plurality of the element pressing portions are arranged in a direction substantially orthogonal to the plate thickness direction of the filtration element. In the manufacturing method of the filter of Claim 1 or Claim 2,
The mold is composed of at least an upper mold and a lower mold,
The element pressing portion includes a plurality of first convex portions provided on the upper mold side and a plurality of second convex portions provided on the lower mold side. In the manufacturing method of the filter according to claim 3,
The plurality of first protrusions and the plurality of second protrusions are at different positions in a direction substantially orthogonal to the plate thickness direction of the filtration element, and the plurality of first protrusions and the plurality of second protrusions. A method for manufacturing a filter, characterized in that the two convex portions are alternately arranged. In the manufacturing method of the filter according to claim 3,
The plurality of first protrusions and the plurality of second protrusions are at the same position in a direction substantially orthogonal to the plate thickness direction of the filtration element, and the plurality of first protrusions and the plurality of second protrusions The method for producing a filter, wherein the two convex portions are arranged so as to face each other through the peripheral edge portion of the filtration element. The method for manufacturing a filter according to any one of claims 1 to 5, wherein the molding die includes at least an upper die and a lower die.
Between the lower end surface of the upper mold and the upper end surface of the lower mold, a cavity corresponding to the product shape of the outer frame portion is formed,
A method for manufacturing a filter, wherein the outer frame portion is molded by filling the cavity with a molding material. The method of manufacturing a filter according to any one of claims 1 to 6, wherein the filter element is insert-molded inside the outer frame part by molding the outer frame part. The filter manufacturing method characterized by manufacturing the filter of this.

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