JP2012206095A - Strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a strainer in size by making the structure of a pressing means simple and compact, and to improve versatility by making the pressing means applicable to a small strainer.SOLUTION: The strainer includes a cup-like screen 50 detachably installed in a flow passage of a body 1 and having an inflow opening 61a. A receiving part 20 having a receiving surface 21 to which an inflow opening end surface 74c of the screen 50 is pressed and closely fitted is formed on the inner circumference of the side wall forming a flow passage on an inflow port 2 side of the body 1, and an inflow opening edge 50a of the screen 50 is formed to have a ring-like flange 73. A projection 40 facing the receiving surface 21 to form a groove 41 is provided in a protruding manner on the side wall side facing an inlet and outlet hole 10. A tongue piece 80 provided on the flange 73 is pressed onto a facing surface 30 provided on the receiving part 20 by a pressing means 90, with the flange 73 being inserted to the groove 41, to press the inflow opening end surface 74c of the flange 73 onto the receiving surface 21 together with the inner wall surface 40a of the projection 40. The pressing means 90 is constituted by a disk-like plate spring 91 provided at the center of a lid 5.

Description

  The present invention relates to a strainer provided with a screen for filtering foreign matter such as dust contained in a fluid in a conduit through which fluid such as water and oil flows.

  Conventionally, as this type of strainer, for example, one previously proposed by the applicant of the present application is known (published in Japanese Patent No. 4272907). As shown in FIG. 8, the strainer Sa includes a main body 200 having a flow path having an inflow port 201 and an outflow port 202, and an inflow opening 211 that is detachably mounted in the flow path of the main body 200 and into which a fluid flows. And a cup-shaped screen 210 having the above. The screen 210 is formed by integrally forming a cylindrical mesh member 210b on a pair of front and rear ring frames 210a by welding. The main body 200 is formed of a tubular body having a straight channel, and a side wall is formed with an inlet / outlet hole 203 for taking in and out the screen 210 to form a channel on the inlet 201 side. A receiving portion 205 having a receiving surface 204 that is in close contact with the inflow opening end surface 212 of the screen 210 when the screen 210 is mounted is formed on the inner periphery, and the axis of the main body 200 is inserted into the inner wall that forms the flow path. Guide protrusions 206 are provided to support and guide the screen 210 so that the axis of the screen 210 at the time is coaxial. A contact surface of the guide projection 206 that contacts the screen 210 is formed on a circumferential surface along the outside of the screen 210.

  The strainer Sa includes a lid 207 that opens and closes the entrance / exit hole 203, and a pressing unit 220 that presses the inflow opening end surface 212 of the screen 210 against the receiving surface 204 of the main body 200. The pressing means 220 is an inner wall that forms a flow path of the main body 200 and is screwed into the female screw portion 221 at the one end side 224a and a female screw portion 221 provided on the outlet 202 side of the bottom portion 213 of the screen 210. A bolt 224 having a male screw portion 222 and a bolt head 223 rotated by a fastening tool on the other end 224b, and a truncated cone concentrically provided on the bolt 224 and extending toward the other end 224b of the bolt 224. And a pressing member that has a tapered surface 226a that contacts the conical surface 225a of the truncated cone portion 225 and presses the inflow opening end surface 212 of the screen 210 against the receiving surface 204 of the main body 200 by screwing the bolt 224 into the female screw portion 221. 226.

When the screen 210 is attached to the main body 200, the lid 207 is removed to open the entrance / exit hole 203, the screen 210 is inserted into the main body 200 from the entrance / exit hole 203, and is placed on the guide protrusion 206. The opening end surface 212 is opposed to the receiving surface 204 of the main body 200. Then, the inflow opening end surface 212 of the screen 210 is pressed against the receiving surface 204 of the main body 200 by the pressing means 220. Specifically, the male screw portion 222 of the bolt 224 is screwed into the female screw portion 221 of the main body 200, and the bolt head 223 of the bolt 224 is rotated with a tightening tool to screw the bolt 224 into the main body 200. At this time, the conical surface 225 a of the truncated cone portion 225 gradually pushes down the tapered surface 226 a provided on the pressing member 226, and the pressing member 226 is fixed to the bottom 213 of the screen 210, and the screen 210 is placed on the guide protrusion 206. Therefore, it does not move in the axial direction of the bolt 224 but proceeds to the inlet 201 side along the circumferential surface of the guide projection 206, and the inflow opening end surface 212 of the screen 210 is received by the receiving surface 204 of the receiving portion 205 of the main body 200. Close contact with. Thereafter, the lid 207 is put on the entrance / exit hole 203 to close the entrance / exit hole 203.
When the fluid flows into the strainer Sa to which the screen 210 is attached from the inflow port 201, foreign matters mixed in the fluid are filtered by the screen 210 and flow out from the outflow port 202.

  Conventionally, as this type of strainer, although not shown, for example, one described in Patent Document 2 (Japanese Patent Laid-Open No. 2006-761) previously proposed by the applicant of the present application is also known.

Japanese Patent No. 4272907 JP 2006-761 A

  However, in this conventional strainer Sa, the bolt 224 is inserted into the main body 200, and the bolt 224 is screwed into the female screw portion 221 provided on the outflow port 202 side with respect to the bottom portion 213 of the screen 210. Since the screen 210 is attached to the main body 200 by pushing the bottom portion 213 of the screen 210, the pressing means 220 has a relatively complicated and large structure, and there is a problem that the strainer Sa is increased in size. In addition, since the pressing unit 220 has a relatively complicated and large structure, the pressing unit 220 cannot be applied to a small strainer, and there is a problem that versatility is poor.

  The present invention has been made in view of such problems, and it is possible to reduce the strainer by making the structure of the pressing means simple and small, and to improve the versatility by applying the pressing means to a small strainer. The purpose is to provide the intended strainer.

In order to achieve such an object, the strainer of the present invention includes a main body having a flow path having a fluid inflow port and an outflow port, and an inflow in which fluid is detachably mounted in the flow path of the main body. A cup-shaped screen having an opening; a loading / unloading hole provided on a side wall of the main body for loading and unloading the screen; and a lid for opening and closing the loading / unloading hole. In the strainer formed by forming a receiving portion having a receiving surface that is in close contact with the inflow opening end surface of the screen when the screen is mounted on the inner periphery of the side wall forming the path,
An inflow opening edge of the screen is formed with a ring-shaped flange protruding outward,
Protrusions projecting from the side wall facing the access hole of the main body, facing the receiving surface of the receiving portion of the main body and forming a groove into which the flange of the screen is inserted in cooperation with the receiving surface, When the flange is inserted into the groove, the outer peripheral edge of the back side of the flange contacts the inner wall surface on the receiving surface side of the protrusion, and the interval between the receiving surface and the inner wall surface is in the insertion direction of the flange. Inclined to gradually decrease along,
With the flange inserted into the groove, the flange is pressed from the entrance / exit hole side of the main body to the side wall facing the entrance / exit hole, so that the outer peripheral edge on the back side of the flange contacts the inner wall surface of the projection. A pressing means is provided for sliding contact and pressing the opening end surface of the flange against the receiving surface by the inner wall surface,
A tongue piece that inclines from a part of the outer surface of the flange toward the outlet side of the main body from the outer surface,
A receiving portion on the entrance / exit hole side of the main body, provided on the outer side of the receiving surface with a facing surface facing the tongue piece when pressed;
The pressing means is formed by a disk-shaped leaf spring that is provided on the inner side of the lid and presses the tongue against the facing surface when the access hole is closed, and the outer peripheral edge of the leaf spring is the above-mentioned The center of the leaf spring is attached to the center of the lid so as to elastically contact the tongue piece.

  Thus, when the screen is mounted, the lid of the main body is removed to open the entrance / exit hole, the screen is put into the flow path from the entrance / exit hole, and the side with the tongue of the screen is set to the entrance / exit hole side of the main body. Position the tongue on the opposite surface while inserting the flange on the opposite side of the screen where the tongue is located into the groove. In this state, the lid is attached to the access hole. Thereby, the leaf | plate spring as a press means presses a tongue piece, and can press a flange from the entrance / exit hole side of a main body to the side wall side facing an entrance / exit hole. In this case, since the leaf spring is formed in a disk shape and the center of the leaf spring is attached to the center of the lid, the leaf spring is pressed regardless of the rotation position of the lid with respect to the main body.

  Due to the pressing force of the tongue piece, the tongue piece is inclined from the outer surface of the flange toward the outlet of the main body, so that the axial component force that presses the inlet / outlet side of the opening end surface of the flange against the receiving surface And a component force perpendicular to the axial direction that presses the flange from the entrance / exit hole side of the main body to the side wall opposite to the entrance / exit hole, and the outer peripheral edge on the back side of the flange is projected by the component force orthogonal to the axial direction. The inner wall surface can be pressed against the receiving surface on the opposite side of the opening end face of the flange by the inner wall surface, that is, the flange is pressed against the receiving surface from both sides of the circumference. Therefore, the pressing force acts evenly, so that the flange is securely pressed.

In this case, the screen can be mounted by pressing the flange entrance / exit hole side using the inner wall surface of the protrusion, and the pressing means can be constituted by a simple element called a leaf spring. It is not necessary to have a complicated and large structure that pushes the bottom of the screen, the structure of the pressing means can be easily and small, and the strainer can be downsized accordingly. In other words, the pressing means for ensuring the mounting of the screen can be easily applied to a small strainer, and therefore versatility can be greatly improved.
When the fluid flows into the strainer equipped with the screen in this way from the inflow port, foreign matter mixed in the fluid is filtered by the screen and flows out from the outflow port.

If necessary, a protrusion having an outer diameter smaller than the outer diameter of the plate spring is provided on the inner surface of the lid, and the center of the plate spring is attached to the tip of the protrusion. Since the outer peripheral edge of the leaf spring protrudes to the outside of the protrusion, it can bend well and the pressing of the tongue piece can be ensured accordingly.
In this case, an insertion hole is formed in the center of the leaf spring, a female screw portion is formed in the protrusion of the lid, and the male screw portion of the bolt is screwed, and the male screw portion of the bolt is inserted into the insertion hole of the leaf spring. It is effective that the leaf spring is attached to the protrusion by screwing into the female screw portion. Since the leaf spring is attached with a bolt, the attachment is easily performed.

  Moreover, it is set as the structure which provided the stopper which faces the side surface of the tongue piece facing this opposing surface, and controls the movement to the both sides of this tongue piece as needed on both sides of the said opposing surface. When attaching the lid to the access hole with the tongue piece facing the facing surface, the leaf spring as the pressing means presses the tongue piece, but when the leaf spring slides against the tongue piece, Due to the frictional force, the screen moves through the tongue piece, and the position of the pressed tongue piece tends to shift, but the tongue piece stops against the stopper and the movement is restricted. This prevents the tongue piece from deviating from the facing surface and prevents problems such as insufficient pressing or no pressing, and the leaf spring can be reliably pressed by the leaf spring.

  Further, if necessary, a female screw is formed on the inner periphery of the access hole of the main body, and a male screw is formed on the outer periphery of the lid so as to be screwed into the female screw of the access hole. The lid is attached to the access hole by screwing it into the female screw of the access hole. Since the lid is attached by screwing, it can be easily attached as compared with the case where it is separately attached with bolts. In particular, in this lid, the lid stop position varies depending on the rotation of the lid, but since the leaf spring is formed in a disc shape and provided at the center of the lid, in which direction the tightening rotation position with respect to the main body of the lid is Even then, the tongue is pressed by the leaf spring.

  Moreover, it is set as the structure which provided with two or more the said protrusion part in the symmetrical position with respect to the said opposing surface as needed. As a result, the flange is pressed against the receiving surface from three or more locations on the circumference including the portion with the tongue piece, and the protrusion is positioned in a symmetrical position with respect to the facing surface. The pressure acts evenly, and the flange is securely pressed.

  If necessary, the screen is composed of a cylinder and a mesh member made of a bottom plate that closes one of the openings of the cylinder, and a frame that is formed with the flange and detachably holds the mesh member. ing. As a result, the mesh member and the frame are formed separately, and the flange is formed on the frame. Therefore, the flange can be easily formed by making the flange made of a metal casting, so that the screen can be manufactured very easily. Become.

Further, if necessary, it is possible to separate the cylindrical member and the bottom plate of the mesh member, and the frame constitutes a ring-shaped support ring having a support surface for supporting the bottom plate, and the flange constitutes the opening of the cylindrical member. A ring-shaped opening ring having an opening through which an end portion is inserted, and a plurality of ribs that connect the support ring and the opening ring to form a space for holding the cylindrical body.
Thereby, since the mesh member can be separated from the cylindrical body and the bottom plate, cleaning of the mesh member becomes extremely easy. In addition, since the frame is composed of the support ring, the flange ring, and the plurality of ribs, the area where the mesh member is exposed from the frame is increased, so that the fluid filtered through the screen can flow out smoothly.

Furthermore, if necessary, if the outer diameter of the general portion of the cylinder is Ds, the outer diameter of the bottom plate is Db, and the inner diameter of the opening of the frame is Df, Ds <Df <Db is set. Is inserted between the ribs, and the ribs are provided so that they can be mounted on the bearing surface of the bearing ring.
Thus, when inserting the mesh member into the frame, the bottom plate is inserted into the frame from between the ribs and attached to the support surface of the support ring, and then the cylinder is inserted into the frame from the opening of the flange ring. Insert and push until it touches the bottom plate. In this case, since the outer diameter of the bottom plate is formed larger than the outer diameter of the cylinder, the bottom plate can be pressed by the cylinder, and therefore, the bottom plate can be held between the cylinder and the support ring. The bottom plate can be securely held.

  According to the strainer of the present invention, the screen is put into the flow path from the entrance / exit hole, a groove is inserted into the flange of the screen, and then the flange of the screen is used for entering / exiting the body with a leaf spring provided as a pressing means on the lid Since the screen is attached to the main body by pressing from the hole side to the side wall opposite to the entrance / exit hole, the outer peripheral edge on the back side of the flange slides into the groove on the inner wall surface of the projection, and the inner wall surface Since the opening end surface can be pressed against the receiving surface, the flange is pressed down. In this case, the screen can be attached by pressing the flange entrance / exit hole side using the inner wall surface of the protrusion, and the pressing means can be constituted by a simple element called a leaf spring. It is not necessary to have a complicated and large structure that pushes the bottom, the structure of the pressing means can be easily and small, and the strainer can be downsized accordingly. In other words, the pressing means for ensuring the mounting of the screen can be easily applied to a small strainer, and therefore versatility can be greatly improved.

  Further, according to the present invention, the leaf spring as the pressing means is formed in a disk shape, and the center of the leaf spring is attached to the center of the lid, so that the rotation position of the lid with respect to the main body is in any direction. It is possible to perform pressing with a leaf spring. In particular, in the case where a female screw is formed on the inner periphery of the access hole of the main body, a male screw is formed on the outer periphery of the lid, and the lid is attached by screwing. The leaf spring is formed in a disc shape and is provided at the center of the lid, so that the tongue piece is pressed by the leaf spring regardless of the direction of the tightening rotation position relative to the lid body. It has the effect of being able to

It is a disassembled perspective view which shows the strainer which concerns on embodiment of this invention. It is a figure which shows the structure of a cylinder in the screen of the strainer which concerns on embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is a cross-sectional view. It is a longitudinal cross-sectional view which shows the screen of the strainer which concerns on embodiment of this invention. In the strainer which concerns on embodiment of this invention, it is a longitudinal cross-sectional view which shows the state at the time of mounting | wearing with a screen. In the strainer which concerns on embodiment of this invention, it is a figure which shows the state with which the screen was mounted | worn, (a) is a longitudinal cross-sectional view, (b) is a top view of the state which removed the cover. FIG. 5A is an enlarged cross-sectional view of a portion A in FIG. 5 illustrating a state in which the screen according to the embodiment is mounted, and FIG. 5B is a comparison in which the diameter of the mesh member is not increased. FIG. 6 is an enlarged cross-sectional view corresponding to a portion A in FIG. It is a longitudinal cross-sectional view which shows the strainer which concerns on another embodiment of this invention. It is a figure which shows an example of the conventional strainer.

Hereinafter, a strainer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 6 show a strainer S according to an embodiment of the present invention. The basic configuration of the strainer S includes a main body 1 having a flow path having an inlet 2 and an outlet 3, and a cup having an inflow opening 61a that is detachably mounted in the flow path of the main body 1 and into which a fluid flows. The screen 50 is provided. The inflow opening edge 50a of the screen 50 is formed with a ring-shaped flange 73 protruding outward.

  The main body 1 is a tubular body having a straight channel, and is formed of a casting. On the inner edges of the inlet 2 and outlet 3 of the main body 1, female threads 4 for attaching the main body 1 to other pipes through which fluid flows are formed. In addition, the side wall of the main body 1 is provided with a loading / unloading hole 10 for loading and unloading the screen 50. The access hole 10 is formed in a circular shape, and a female screw 11 is formed on the inner periphery of the access hole.

  The access hole 10 is provided with a lid 5 for opening and closing the hole. The lid 5 is made of a casting similar to that of the main body 1 and is formed in a column shape having a central axis P, and is formed corresponding to the access hole 11. Specifically, a male screw 6 is formed on the outer periphery of the lid 5 so as to be screwed into the female screw 11 of the access hole 10. By screwing the male screw 6 of the cover 5 into the female screw 11 of the access hole 11, The lid 5 is attached to the entrance / exit hole 11. Further, a hexagonal column-shaped head 7 is provided on the upper surface of the lid 5 so that a center axis P is an axis and a tool such as a spanner engages. On the other hand, a cylindrical projection 8 having an outer diameter smaller than the outer diameter of a plate spring 91 described later is provided on the inner lower surface of the lid 5. Further, a ring-shaped packing 9 is provided at the base end of the male screw 6 of the lid 5 for sealing with the access hole 10.

  In addition, a receiving portion 20 having a receiving surface 21 that is in close contact with the inflow opening end surface 74c of the screen 50 when the screen 50 is mounted is formed on the inner periphery of the side wall forming the flow path on the inlet 2 side of the main body 1. Has been. Further, on the outside of the receiving surface 21 which is the receiving portion 20 on the entrance / exit hole 10 side of the main body 1, a facing surface 30 is formed which is pressed against a tongue piece 80 which will be described later. The facing surface 30 is formed by cutting out the outside of the receiving surface 21 of the receiving portion 20 and is inclined toward the outlet 3 side of the main body 1. Further, on both sides of the facing surface 30, there are provided stoppers 30 a that face the side surfaces of the tongue piece 80 facing the facing surface 30 and restrict the movement of the tongue piece 80 to both sides. The stopper 30a is composed of both side wall surfaces of a portion where the receiving portion 20 is cut away in order to form the facing surface 30.

  Further, a groove 41 into which the flange 73 of the screen 50 is inserted is formed on the side wall of the main body 1 facing the entrance / exit hole 10 so as to face the receiving surface 21 of the receiving portion 20 of the main body 1. A protruding portion 40 is formed. The protrusion 40 has an inner wall surface 40a on the receiving surface 21 side that comes into contact with the outer peripheral edge 73a on the back side of the flange 73 when the flange 73 is inserted into the groove 41, and an interval between the receiving surface 21 and the inner wall surface 40a. It is formed so as to be gradually decreased along the insertion direction of the flange 73. A pair of the protrusions 40 are provided at symmetrical positions with respect to the facing surface 30.

  As shown in FIGS. 1 to 3, 5, and 6, the screen 50 includes a cylindrical body 61 having an opening on one end side as an inflow opening 61 a and a bottom plate 62 that closes an opening on the other end side of the cylindrical body 61. The mesh member 60 and a cylindrical frame 70 having a flange 73 having an open port 74a surrounding the outer periphery of the inflow opening end portion 61b of the mesh member 60 and holding the mesh member 60 in a removable manner. Yes.

The mesh member 60 is made of, for example, a metal such as stainless steel, and is formed so that a cylindrical tube body 61 and a disk-shaped bottom plate 62 can be separated. Since the net member 60 can be separated from the cylindrical body 61 and the bottom plate 62, cleaning of the net member 60 becomes extremely easy.
Further, the cylindrical body 61 and the bottom plate 62 of the mesh member 60 are each made of an outer member 64 formed of a metal punch plate having a large number of small holes 63 and an inner member of the outer member 64 by welding. And an inner member 65 formed of a net. In FIG. 2, reference numeral 66 denotes a welded seal plate that seals the joint of the cylindrical body 61. The opening width M of the metal net constituting the inner member 65 is, for example, 20 mesh, M = 1 mm, 40 mesh, M = 0.5 mm, 60 mesh, M = 0.3 mm, 80 mesh, M = 0.2 mm, 100 mesh, M = 0.15 mm, 200 mesh, M = 0.08 mm. Then, as the metal net of the inner member 65, those of various meshes, for example, M ≦ 0.5 mm, are selected according to the use conditions of the strainer S. In the embodiment, the metal net constituting the inner member 65 is, for example, 100 mesh (having 1 × 10 ⁴ eyes in one inch square) and the eye opening width M is 0.15 mm or less. Is used. Since the net-like member 60 has a two-layer structure of a metal punch plate and a metal net, the strength is increased.

  Further, in the mesh member 60, the outer diameter of the inflow opening end portion 61b of the mesh member 60 is made to be a mesh shape so that the outer periphery of the inflow opening end portion 61b of the mesh member 60 is joined or close to the inner periphery of the opening 74a of the frame. The diameter of the member 60 is larger than the outer diameter of the general part. The inflow opening end portion 61 b is enlarged in a tapered shape from the other end side of the cylindrical body 61 toward the one end side. The diameter expansion is performed, for example, by pressing the cylindrical body 61 against a tapered jig with a press or the like. In this case, since the mesh member 60 has a two-layer structure of a metal punch plate and a metal net, the mesh member 60 has high strength and can be easily and reliably expanded in diameter.

Further, in the cylindrical body 61, as shown in FIGS. 1 to 3, the outer diameter of the general portion of the cylindrical body 61 is Ds, the outer diameter of the inflow opening end portion 61b of the cylindrical body 61 is Da, and the opening of the frame 70 is opened. When the inner diameter of 74a is Df and the opening width of the mesh-like member 60 is M, Ds <(Df−M) ≦ Da. Ds <Df ≦ Da may be satisfied. Although depending on the size of the screen and the opening width M of the mesh member 60, when the dimensional unit is mm, Ds = Df− (0.3 to 0.8 mm), Da = Df + (− M to 0. 5 mm) is preferable. Desirably, Da = Df + (0 to 0.2 mm), and more desirably Da = Df + (0 to 0.1 mm).
For example, when M ≦ 0.15 mm (100 mesh) is selected and Df = 45.0 mm, Ds = 44.7 mm and Da = 45.0 mm.

The frame 70 is a ring-shaped support ring 72 having a support surface 71 for supporting the bottom plate 62, and a ring-shaped support ring 72 having a flange 73 and an opening 74a through which the inflow opening end portion 61b of the cylindrical body 61 is inserted. The opening ring 74 is configured to include a support ring 72 and a plurality of ribs 75 (four in the embodiment) that form a space for connecting the opening ring 74 and holding the cylindrical body 61. The bearing ring 72, the opening ring 74, and the plurality of ribs 75 are integrally formed of a stainless steel casting. Since the mesh member 60 and the frame 70 are formed separately and the flange 73 is formed on the frame 70, the flange 73 can be easily formed by making the flange 73 made of a metal casting. Is extremely easy.
Further, when the outer diameter of the general portion of the cylindrical body 61 is Ds, the outer diameter of the bottom plate 62 is Db, and the inner diameter of the opening 74a of the frame is Df, Ds <Df <Db is set, and the bottom plate 62 is positioned between the ribs 75. The rib 75 is provided so that it can be inserted into the support surface 71 of the support ring 72.

  Further, the opening ring 74 is provided with a tongue piece 80 that projects from the outer surface 74b toward the outlet 3 side of the main body 1 corresponding to the facing surface 30 in a part of the outer surface 74b. . In a state where the tongue piece 80 is pressed by the pressing means 90 described later and faces the facing surface 30, a slight gap is generated between the facing surface 30 and the tongue piece 80. The tongue piece 80 can be bent by this gap, so that the pressing is surely performed. Further, in a state where the tongue piece 80 faces the facing surface 30, the side surface of the tongue piece 80 faces the stopper 30a.

  Furthermore, the strainer S according to the present embodiment presses the flange 73 from the entrance / exit hole 10 side of the main body 1 to the side wall facing the entrance / exit hole 10 in a state where the flange 73 is inserted into the groove 41. A pressing means 90 is provided in which the outer peripheral edge 73a on the back side of 73 is brought into sliding contact with the inner wall surface 40a of the protrusion 40, and the inflow opening end surface 74c of the flange 73 is pressed against the receiving surface 21 by the inner wall surface 40a.

  This pressing means 90 is configured to press the tongue piece 80 as shown in FIGS. The pressing means 90 is provided on the inner back surface of the lid 5 and is made of an elastic member that presses the tongue piece 80 against the facing surface 30 when the access hole 10 is closed. The elastic member is formed of a disk-shaped leaf spring 91, and the center of the leaf spring 91 is attached to the center of the lid 5 so that the outer peripheral edge portion 91 a of the leaf spring 91 is in elastic contact with the upper surface of the tongue piece 80. Yes. A projection 8 having an outer diameter smaller than the outer diameter of the leaf spring 91 is provided on the inner rear surface of the lid 5. The center of the leaf spring 91 is attached to the tip (end surface) of the projection 8. . Specifically, an insertion hole 92 is formed at the center of the leaf spring 91, while a female screw portion 95 into which the male screw portion 94 of the bolt 93 is screwed is formed on the protrusion 8 of the lid 5. The plate spring 91 is attached to the protrusion 8 by inserting the male screw portion 94 into the insertion hole 92 of the plate spring 91 and screwing into the female screw portion 95. Reference numeral 96 denotes a washer interposed between the bolt head and the leaf spring 91. Since the leaf spring 91 is attached with the bolt 93, the attachment is easily performed.

  Therefore, in the strainer S according to this embodiment, when the screen 50 is mounted on the main body 1, first, as shown in FIGS. 1 to 3, the mesh member 60 is first inserted into the frame 70 to form the screen 50. . Specifically, when the outer diameter of the general portion of the cylindrical body 61 is Ds, the outer diameter of the bottom plate 62 is Db, and the inner diameter of the opening 74a of the frame is Df, Ds <Df <Db is set. The bottom plate 62 is inserted into the frame 70 between the ribs 75 and 75 and is attached to the support surface 71 of the support ring 72. Thereafter, the cylindrical body 61 is inserted into the frame 70 from the opening 74a of the opening ring 74. Push until it touches the bottom plate 62. Thereby, since the outer diameter of the bottom plate 62 is formed larger than the outer diameter of the cylindrical body 61, the bottom plate 62 can be pressed by the cylindrical body 61, so that the bottom plate 62 is fixed by the cylindrical body 61 and the support ring 72. Since it can be held, the bottom plate 62 can be reliably held.

  In this case, the outer diameter of the general part of the cylindrical body 61 is Ds, the outer diameter of the inflow opening end 61b of the cylindrical body 61 is Da, the inner diameter of the opening 74a of the frame 70 is Df, and the opening width of the mesh member 60 is the opening width of the mesh 60. Since it is set as Ds <(Df−M) ≦ Da when M, since the general part of the mesh member 60 has a small diameter, it can be easily and reliably inserted from the opening 74a of the frame 70. Finally, since resistance when the inflow opening end portion 61b of the mesh member 60 is inserted into the opening 74a of the frame 70 is reduced, the mesh member 60 can be easily inserted into the frame 70.

  In particular, as shown in FIGS. 3 and 6, when the inflow opening end 61b of the mesh member 60 is finally pushed into the opening 74a of the frame 70, the inflow opening end 61b is joined to or close to the opening 74a. Therefore, the outer periphery of the inflow opening end portion 61b is pushed by the opening port 74a of the frame 70 without being reduced in diameter, or the outer periphery of the inflow opening end portion 61b is the opening port of the frame 70. The diameter is slightly reduced by being pushed by 74 a and is inserted into the opening 74 a of the frame 70. At this time, when the outer periphery of the inflow opening end portion 61b is joined to the inner periphery of the opening port 74a of the frame 70, there is some resistance due to being pushed by the opening port 74a of the frame 70. Since the insertion is the last slight insertion, the insertion operation is not hindered. For this reason, since the simple operation of simply inserting the mesh member 60 into the frame 70 is sufficient, the assembly is easily performed. Further, since the inflow opening end portion 61b is tapered from the other end side to the one end side of the cylindrical body 61, the inflow opening end portion 61b of the mesh member 60 is pushed into the opening port 74a of the frame 70. Resistance is further reduced, and the mesh member 60 can be easily inserted into the frame 70. In a state where the mesh member 60 is inserted into the frame 70, the inflow opening end portion 61b is joined or close to the open port 74a.

  When the screen 50 formed in this way is attached to the main body 1, as shown in FIG. 4, the lid 5 of the main body 1 is removed to open the entrance / exit hole 10, and the screen 50 flows from the entrance / exit hole 10. Insert the flange 50 on the opposite side of the screen 50 from the side having the tongue piece 80 into the groove 41 with the tongue 50 side of the screen 50 positioned on the entrance / exit hole 10 side of the main body 1. However, the tongue piece 80 is opposed to the opposed surface 30.

Thereafter, the male screw 6 of the lid 5 is screwed into the female screw 11 of the entrance / exit hole 10, and the lid 5 is attached to the entrance / exit hole 10. Thereby, the leaf spring 91 as the pressing means 90 presses the tongue piece 80, and the flange 73 can be pressed from the entrance / exit hole 10 side of the main body 1 to the side wall side facing the entrance / exit hole 10. In this case, since the lid 5 is attached by screwing, it can be easily attached as compared with a case where it is separately attached with a bolt. In particular, in the lid 5, the stop position of the lid 5 varies depending on the rotation of the lid 5, but the leaf spring 91 is formed in a disc shape, and the center of the leaf spring 91 is attached to the center of the lid 5. Even if the stop position of the lid 5 varies depending on the rotation of the lid 5, that is, regardless of the direction of the tightening rotation position of the lid 5 with respect to the main body 1, the pressing by the leaf spring 91 is performed.
Further, in this case, since the lid 5 rotates, the leaf spring 91 comes into sliding contact with the tongue piece 80 while being elastically contacted, and the screen 50 moves through the tongue piece 80 by the frictional force, and is pressed. Although the position of 80 tends to be shifted, since the stoppers 30a are provided on both sides of the facing surface 30, the tongue piece 80 stops against the stopper 30a and is restricted from moving. Therefore, the tongue piece 80 does not deviate from the facing surface 30, and the tongue piece 80 is displaced from the facing surface 30, thereby preventing problems such as insufficient pressing or no pressing, and the tongue piece by the leaf spring 91. 80 can be reliably pressed.

  As shown in FIG. 5, the tongue piece 80 is inclined from the outer surface 74 b of the opening ring 74 toward the outlet 3 side of the main body 1 by the pressing force W of the tongue piece 80. The axial component force Wa for pressing the inlet / outlet end surface 74c of the inflow opening end surface 74c against the receiving surface 21 and the opening ring 74 from the inlet / outlet hole 10 side of the main body 1 to the side wall facing the inlet / outlet hole 10 are pressed. And a component force Wb perpendicular to the axial direction is generated, and the component Wb perpendicular to the axial direction causes the rear outer peripheral edge 73a of the flange 73 to be in sliding contact with the inner wall surface 40a of the protrusion 40, and the inner wall surface 40a opens the opening ring. The side opposite to the entrance / exit hole 10 side of the inflow opening end surface 74 c of 74 can be pressed against the receiving surface 21. Further, since the leaf spring 91 is attached to the protrusion 8 having an outer diameter smaller than the outer diameter, the outer peripheral edge portion 91a of the leaf spring 91 protrudes to the outside of the protrusion 8, so that the blade spring 91 can be bent well. , The pressing of the tongue piece 80 can be ensured.

  As a result, the rear outer peripheral edge 73a of the flange 73 slides into contact with the inner wall surface 40a of the protrusion 40 and bites into the groove 41, and the inner wall surface 40a presses the inflow opening end surface 74c of the opening ring 74 against the receiving surface 21. In other words, the flange 73 can be pressed against the receiving surface 21 from both sides of the circumference thereof, so that the pressing force acts evenly, so that the flange 73 is reliably pressed. Further, since the flange 73 is pressed against the receiving surface 21 from three places on the circumference including the portion with the tongue piece 80, and the projection 40 is located at a symmetrical position with respect to the facing surface 30, the The pressing force acts evenly, and the flange 73 is securely pressed.

  In this case, the screen 50 can be mounted by pressing the side wall 10a of the flange 73 using the inner wall surface 40a of the protrusion 40, and the pressing means 90 can be configured with a simple element called a leaf spring 91. It is not necessary to use a complicated and large structure for pressing the pressing means at the bottom of the screen as in the prior art, the structure of the pressing means 90 can be easily and miniaturized, and the strainer S can be miniaturized. . In other words, the pressing means 90 that ensures the mounting of the screen 50 can be easily applied to the small strainer S, and therefore versatility can be greatly improved.

  In this way, when the fluid flows into the strainer S to which the screen 50 is attached, the foreign matter mixed in the fluid is filtered by the screen 50 and flows out from the outlet 3. In this case, as shown in FIG. 6A, since the outer periphery of the inflow opening end 61b of the mesh member 60 is joined or close to the inner periphery of the open port 74a of the frame 70, the inflow opening end 61b Since no gap is formed between the opening 74a and the opening can be made smaller than the mesh opening width M of the mesh member 60, foreign matter such as dust passes through the screen without being filtered. Can be prevented, and the filtration accuracy can be improved. In the embodiment, since Ds <(Df−M) ≦ Da, even when the outer diameter Da of the inflow opening end portion 61b of the cylindrical body 61 is smaller than the inner diameter Df of the opening port 74a of the frame 70, the clearance is reticulated. Since it does not become larger than the opening width M of the eye of the member 60, the filtration accuracy is not impaired.

That is, as shown in FIG. 6B, even if the inflow opening end surface 74 c of the screen 50 is pressed against the receiving surface 21 of the receiving portion 20, the inflow opening end portion 61 b of the mesh member 60 is straight and its outer periphery and the frame 70. If there is a gap larger than the opening width M of the mesh member 60 between the inner periphery of the open port 74a, fluid flows from the gap, and foreign matter such as dust contained in the fluid flowing through the gap is screen 50. The mesh member 60 may pass through without being filtered. Therefore, even if a fine mesh is provided on the mesh member 60, the filtration accuracy may not be substantially improved. This can be prevented in the screen 50 according to the embodiment.
Further, in this case, since the frame 70 is constituted by the support ring 72, the opening ring 74, and the plurality of ribs 75, the area where the mesh member 60 is exposed from the frame 70 becomes large. It can be drained smoothly.

  As the strainer S is used, the mesh member 60 is often damaged or broken. In this case, the mesh member 60 is replaced, but the frame 70 and the mesh member 60 are formed separately. The frame 70 can be left as it is, and only the mesh member 60 can be replaced to cope with it, so that the cost can be reduced accordingly.

  FIG. 7 shows a strainer according to another embodiment of the present invention. This is a type in which the lid 5 is pressed against the main body 1 with a plurality of bolts 100 and fixed, unlike the strainer described above. Other configurations are the same as described above. Also in this case, even if the direction of the lid 5 is different, the leaf spring 91 is formed in a disc shape and the center of the leaf spring 91 is attached to the center of the lid 5, so Pressing is performed.

  In the above embodiment, the mesh member 60 is separated into the cylindrical body 61 and the bottom plate 62. However, the present invention is not necessarily limited to this, and may be integrated. Moreover, in the said embodiment, although the cylindrical body 61 and the baseplate 62 of the mesh member 60 were made into the double structure of the outer member 64 and the inner member 65, respectively, it is not necessarily limited to this, It may be configured as a single unit and may be changed as appropriate. Furthermore, in the above-described embodiment, the screen 50 is configured by the mesh member 60 and the frame 70, but is not necessarily limited thereto, and may be configured integrally or may be appropriately changed. In the above embodiment, the net member 60 has a net of 100 mesh or more and an eye opening width M of 0.15 mm or less. However, the present invention is not limited to this, and the net flows through the flow path. It is sufficient that foreign matters such as dust contained in the fluid can be filtered and separated, and can be changed as appropriate.

S Strainer W Pressing force Wa, Wb Component 1 Main body 2 Inlet 3 Outlet 4 Female screw 5 Lid 6 Male screw 8 Protrusion 10 In / out hole 11 Female screw 20 Receiving portion 21 Receiving surface 30 Confronting surface 30a Stopper 40 Protruding portion 40a Inner wall surface 41 Groove 50 Screen 50a Inflow opening edge 60 Net member 61 Tube 61a Inflow opening 61b Inflow opening end 62 Bottom plate 63 Small hole 64 Outer member 65 Inner member 70 Frame 71 Bearing surface 72 Bearing ring 73 Flange 73a Backside outer periphery 74 Opening ring 74a Opening port 74b Outer side surface 74c Inflow opening end surface 75 Rib Ds Outer diameter Da of the general part of the cylindrical body 61 Outer diameter Df of the inflowing opening end part 61b of the cylindrical body 61 Inner diameter Db of the opening 70a of the frame 70 Bottom plate 62 The outer diameter M of the mesh member 60 The mesh opening width 80 The tongue piece 81 The bolt insertion hole 82 The female screw 83 The bolt 90 The pressing means 9 1 leaf spring 91a outer peripheral edge 92 insertion hole 93 bolt

Claims (8)

A main body having a flow path having a fluid inlet and a fluid outlet, a cup-shaped screen detachably mounted in the flow path of the main body and having an inflow opening through which fluid flows, and a side wall of the main body An opening / closing hole for opening / closing the screen and a lid for opening / closing the opening / closing hole, and the screen is mounted on the inner periphery of the side wall forming a flow path on the inlet side of the main body when the screen is mounted. In the strainer formed by forming a receiving portion having a receiving surface that is in close contact with the inflow opening end surface of
An inflow opening edge of the screen is formed with a ring-shaped flange protruding outward,
Protrusions projecting from the side wall facing the access hole of the main body, facing the receiving surface of the receiving portion of the main body and forming a groove into which the flange of the screen is inserted in cooperation with the receiving surface, When the flange is inserted into the groove, the outer peripheral edge of the back side of the flange contacts the inner wall surface on the receiving surface side of the protrusion, and the interval between the receiving surface and the inner wall surface is in the insertion direction of the flange. Inclined to gradually decrease along,
With the flange inserted into the groove, the flange is pressed from the entrance / exit hole side of the main body to the side wall facing the entrance / exit hole, so that the outer peripheral edge on the back side of the flange contacts the inner wall surface of the projection. A pressing means is provided for sliding contact and pressing the opening end surface of the flange against the receiving surface by the inner wall surface,
A tongue piece that inclines from a part of the outer surface of the flange toward the outlet side of the main body from the outer surface,
A receiving portion on the entrance / exit hole side of the main body, provided on the outer side of the receiving surface with a facing surface facing the tongue piece when pressed;
The pressing means is formed by a disk-shaped leaf spring that is provided on the inner side of the lid and presses the tongue against the facing surface when the access hole is closed, and the outer peripheral edge of the leaf spring is the above-mentioned A strainer, wherein the center of the leaf spring is attached to the center of the lid so as to elastically contact the tongue piece.   2. The strainer according to claim 1, wherein a protrusion having an outer diameter smaller than the outer diameter of the leaf spring is provided on the inner surface of the lid, and the center of the leaf spring is attached to the tip of the protrusion.   The strainer according to claim 1 or 2, wherein stoppers are provided on both sides of the facing surface so as to face a side surface of the tongue piece facing the facing surface and restrict movement of the tongue piece to both sides. .   A female screw is formed on the inner periphery of the access hole of the main body, a male screw is formed on the outer periphery of the cover, and the female screw of the access hole is screwed into the female hole of the access hole. 4. The strainer according to claim 1, wherein the lid is attached to the access hole by screwing into a screw.   The strainer according to any one of claims 1 to 4, wherein a plurality of the protrusions are provided at symmetrical positions with respect to the facing surface.   2. The screen according to claim 1, wherein the screen is composed of a cylinder and a mesh member made up of a bottom plate that closes one opening of the cylinder, and a frame that is formed with the flange and detachably holds the mesh member. The strainer in any one of thru | or 5. The cylinder body and the bottom plate of the mesh member can be separated,
The frame includes a ring-shaped bearing ring having a bearing surface for supporting the bottom plate, a ring-shaped opening ring having an opening through which the opening end of the cylindrical body is inserted, and the bearing. The strainer according to claim 6, wherein the strainer includes a plurality of ribs that connect the ring and the opening ring to form a space for holding the cylindrical body.   When the outer diameter of the general portion of the cylindrical body is Ds, the outer diameter of the bottom plate is Db, and the inner diameter of the opening of the frame is Df, Ds <Df <Db is set, and the bottom plate is inserted between the ribs. The strainer according to claim 7, wherein the rib is provided so as to be attachable to a support surface of the support ring.

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