JP5774345B2 - Strainer screen and strainer - Google Patents

Description

  The present invention relates to a strainer screen that is installed in a flow path of a strainer used in a pipe line through which fluid such as water and oil flows, and a strainer including the screen.

  Conventionally, as a strainer, what was previously proposed by the applicant of the present application is known (published in Japanese Patent No. 4272907). As shown in FIG. 9, 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, proceeds to the inlet 201 side along the circumferential surface of the guide protrusion 206, and the inflow opening end surface 212 of the screen 210 is 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.

Japanese Patent No. 4272907

  By the way, the conventional strainer screen 210 is often damaged or broken as the strainer Sa is used. In this case, the frame 210a and the net-like member 210b are integrally formed. Therefore, there is a problem that the cost is high because the whole is to be exchanged. Therefore, the frame 210a and the mesh member 210b are formed separately, the mesh member 210b is inserted into the frame 210a and assembled, and when replacing, only the mesh member 210b can be replaced. However, there is a concern that a clearance is easily generated between the mesh member 210b and the frame 210a, and the filtration accuracy is lowered.

  The present invention has been made in view of the above-mentioned problems, and separates the mesh member and the frame so that only the mesh member can be exchanged when replacing it. It is an object of the present invention to provide a strainer screen and a strainer in which a clearance is not generated between the outer periphery of the end portion of the inflow opening and the inner periphery of the opening of the frame so as to improve the filtration accuracy.

In order to achieve such an object, the strainer screen of the present invention is a cup-shaped strainer screen that is detachably mounted in the flow path of the strainer and has an inflow opening through which fluid flows.
The screen includes a cylindrical member having an opening on one end side as the inflow opening and a bottom plate that closes the opening on the other end of the cylindrical body, and an opening that surrounds the outer periphery of the end of the inflow opening of the mesh member. A cylindrical frame that has a mouth and holds the mesh member in a removable manner;
The outer diameter of the inflow opening end of the mesh member is larger than the outer diameter of the general portion of the mesh member so that the outer periphery of the inflow opening end of the mesh member is joined or close to the inner periphery of the opening of the frame. The diameter is configured.

Thereby, since the mesh member and the frame are formed separately, the frame can be made of, for example, a metal casting, and the manufacturing can be facilitated. Further, when the mesh member is assembled to the frame , the mesh member is inserted into the frame . Finally, the end of the inflow opening of the mesh member is inserted into the opening of the frame. When the end of the inflow opening of the mesh member is pushed into the opening of the frame, the diameter of the inflow opening is enlarged so that the end of the inflow opening is joined to or close to the opening. It is inserted without being reduced in diameter by being pushed by the opening, or the outer periphery of the inflow opening end is pushed by the opening of the frame to be slightly reduced in diameter and inserted into the opening of the frame. When the outer periphery of the inflow opening end is joined to the inner periphery of the opening of the frame, it is pushed by the opening of the frame and there is some resistance, but the insertion of the inflow opening end is the last slight insertion, There is no hindrance to the insertion work. Therefore, assembling is easily performed because a simple operation of inserting the mesh member into the frame is sufficient. Further, in a state where the mesh member is inserted into the frame, the inflow opening end portion is joined to or close to the opening.

When the screen assembled in this way is used in a strainer, when a fluid flows into the strainer, the fluid flows in from the inflow opening end of the mesh member, and foreign matters mixed in the fluid are filtered by the mesh member. It flows out. In this case, since the outer periphery of the inflow opening end of the mesh member is joined or close to the inner periphery of the opening of the frame, there is no gap between the inflow opening end and the opening, Even if it occurs, since it can be made smaller than the opening width of the mesh of the mesh member, it is possible to prevent foreign matters such as dust from passing through the screen without being filtered, and to improve the filtration accuracy. .
In addition, the mesh member is often damaged or broken with the use of the strainer. In this case, the mesh member is replaced. However, since the frame and the mesh member are formed separately, the frame remains as it is. It is possible to cope with the problem by exchanging only the net member, and the cost can be reduced accordingly.

More specifically, the outer diameter of the general portion of the cylindrical body is Ds, the outer diameter of the inflow opening end portion of the cylindrical body is Da, the inner diameter of the opening of the frame is Df, and the opening of the mesh member is opened. When the width is M, Ds <(Df−M) ≦ Da. Ds <Df ≦ Da may be satisfied. Although it depends on the size of the screen and the opening width M of the mesh member, when the dimensional unit is mm, Ds = Df− (0.3 to 0.8 mm), Da = Df + (− M to 0.5 mm). ) Is good. Desirably, Da = Df + (0 to 0.2 mm), and more desirably Da = Df + (0 to 0.1 mm). The opening width M of the mesh member is, for example, 20 mesh, M = 1 mm, 40 mesh, M = 0.5 mm, 60 mesh, M = 0.3 mm, 80 mesh. With M = 0.2 mm and 100 mesh, M = 0.15 mm and 200 mesh with M = 0.08 mm. As the mesh member, those of various meshes, for example, M ≦ 0.5 mm are selected according to the use condition of the strainer.
Since the general part of the mesh member has a small diameter, it can be easily and reliably inserted from the opening of the frame, and the resistance when the inflow opening end of the mesh member is finally inserted into the opening of the frame is reduced. Therefore, the mesh member can be easily inserted into the frame. Further, even when the outer diameter Da of the end portion of the inflow opening of the cylinder is smaller than the inner diameter Df of the opening of the frame, the clearance does not become larger than the opening width M of the mesh member, which may impair the filtration accuracy. Absent.

  Moreover, it is set as the structure which expanded the said inflow opening edge part in the taper shape toward the one end side from the other end side of the said cylinder as needed. Since it is tapered, the resistance when the inflow opening end of the mesh member is pushed into the opening of the frame is further reduced, and the mesh member can be easily inserted into the frame.

Furthermore, if necessary, it is possible to separate the cylindrical body and the bottom plate of the mesh member,
A ring-shaped bearing ring having a bearing surface for supporting the bottom plate; a ring-shaped opening ring having an opening that surrounds an inflow opening end of the cylindrical body; and the bearing ring and the opening ring. And a plurality of ribs forming 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. Further, since the frame is constituted by the opening ring, the support ring, and the plurality of ribs, the area where the mesh member is exposed from the frame is increased, and therefore the fluid filtered by the screen can be smoothly discharged.

Furthermore, if necessary, when 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. The ribs are provided so as to be inserted from between the ribs and mounted on the bearing surface of the bearing ring.
When inserting the mesh member into the frame, insert the bottom plate into the frame from between the ribs and attach it to the support surface of the support ring, and then insert the cylinder into the frame from the opening of the opening ring. Press until it touches the bottom plate.
Thereby, since the outer diameter of the bottom plate is formed larger than the outer diameter of the cylindrical body, the bottom plate can be pressed by the cylindrical body, and therefore, the bottom plate can be held between the cylindrical body and the support ring. The bottom plate can be securely held.

  Further, if necessary, the cylindrical member and the bottom plate of the mesh member are each made of an outer member formed of a metal punch plate having a large number of small holes, and attached to the inner side of the outer member by welding. And an inner member formed of a net. Since the net-like member has a two-layer structure of a metal punch plate and a metal net, the strength is high, and the above-described diameter expansion process can be easily performed.

  In order to achieve the above object, the strainer of the present invention is a strainer equipped with the strainer screen. Thereby, when the fluid flows into the strainer, the fluid flows in from the inflow opening end portion of the mesh member, and foreign matters mixed in the fluid are filtered out by the mesh member and flow out. In this case, since the outer periphery of the inflow opening end of the mesh member is joined or close to the inner periphery of the opening of the frame, there is no gap between the inflow opening end and the opening, Even if it occurs, since it can be made smaller than the opening width of the mesh of the mesh member, it is possible to prevent foreign matters such as dust from passing through the screen without being filtered, and to improve the filtration accuracy. .

According to the present invention, since the mesh member and the frame are formed separately, the frame can be made of, for example, a metal casting, and the manufacturing can be facilitated. Further, when the mesh member is assembled to the frame, it is possible to perform the assembly easily by simply inserting the mesh member into the frame, and the assemblability can be improved. Further, in the strainer using this screen, when a fluid flows into the strainer, the fluid flows in from the inflow opening end of the mesh member, and foreign matters mixed in the fluid are filtered out by the mesh member and flow out. In this case, since the outer periphery of the inflow opening end of the mesh member is joined or close to the inner periphery of the opening of the frame, there is no gap between the inflow opening end and the opening, Even if it occurs, since it can be made smaller than the opening width of the mesh of the mesh member, it is possible to prevent foreign matters such as dust from passing through the screen without being filtered, and to improve the filtration accuracy. .
Furthermore, with the use of the strainer, the mesh member may often be damaged or broken. In this case, the mesh member is replaced. However, since the frame and the mesh member are formed separately, the frame remains as it is. It is possible to cope with the problem by exchanging only the net member, and the cost can be reduced accordingly.

It is a disassembled perspective view which shows the screen for strainers which concerns on embodiment of this invention, and the strainer by which this is used. In the screen for strainers which concerns on embodiment of this invention, it is a figure which shows the structure of a cylinder, (a) is a longitudinal cross-sectional view, (b) is a cross-sectional view. It is a longitudinal cross-sectional view which shows the screen for strainers 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 strainer in the screen for strainers which concerns on embodiment of this invention. It is a figure which shows the state with which the strainer screen which concerns on embodiment of this invention was mounted | worn with the strainer, (a) is a longitudinal cross-sectional view, (b) is a top view of the state which removed the cover. FIG. 5 is a diagram illustrating a strainer screen according to an embodiment of the present invention, in which (a) is an enlarged cross-sectional view of a portion A in FIG. FIG. 6 is an enlarged cross-sectional view corresponding to part A in FIG. It is a longitudinal cross-sectional view which shows the state with which the strainer screen which concerns on embodiment of this invention was mounted | worn with another strainer. It is a longitudinal cross-sectional view which shows the screen for strainers and strainer which concern on another embodiment of this invention. It is a figure which shows an example of the conventional strainer.

Hereinafter, a strainer screen according to an embodiment of the present invention and a strainer using the same will be described in detail with reference to the accompanying drawings.
1 to 6 show a strainer screen and a strainer using the same 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 (FIG. 3) 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. Thus, M = 0.3 mm, 80 mesh, M = 0.2 mm, 100 mesh, M = 0.15 mm, 200 mesh, and 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 perform diameter expansion processing easily and reliably.

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 state in which the strainer screen 50 according to the embodiment of the present invention is attached to another strainer S. 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. Also in this case, the same operations and effects as described above are obtained.

  FIG. 8 shows a strainer screen 50 and a strainer S according to another embodiment of the present invention. This is different from the above in the pressing means 90. The pressing means 90 is provided with a bolt insertion hole 81 in the tongue piece 80, and a female screw 82 is formed on the facing surface 30, and the bolt 83 is inserted into the bolt insertion port 81 of the tongue piece 80 so that the female screw portion of the facing surface 30 is formed. The tongue piece 80 is pressed toward the facing surface 30 by being screwed into 82 and bolts 83. In addition, the lid 5 is of a type that is fixed by being pressed against the main body 5 with a plurality of bolts 100. Also in this case, since the outer periphery of the inflow opening end portion 61b of the mesh member 60 is joined to the inner periphery of the opening port 74a of the frame 70, a gap is generated between the inflow opening end portion 61b and the opening port 74a. In addition, even if it occurs, since it can be made smaller than the opening width M of the mesh of the mesh member 60, it is possible to prevent a foreign matter such as dust from passing through the screen without being filtered, The same operations and effects as described above are achieved, for example, the filtration accuracy can be improved.

In addition, in the said embodiment, mounting | wearing with respect to the main body 1 of the strainer S of the screen 50 is not limited to what was mentioned above, For example, the thing of the type hold | suppressed from the bottom-plate 62 side of a screen may be sufficient as before, It can be changed appropriately.
Moreover, in the said embodiment, although the mesh member 60 was isolate | separated into the cylinder 61 and the baseplate 62, it is not necessarily limited to this, and may be integrated. Furthermore, in the said embodiment, although the cylinder 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.
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 (5)

In the cup-shaped strainer screen that is detachably mounted in the flow path of the strainer and has an inflow opening through which fluid flows,
A cylindrical member having an opening on one end side as the inflow opening, a mesh member made of a bottom plate that closes the opening on the other end side of the cylindrical body, and an opening opening that surrounds the outer periphery of the inflow opening end of the mesh member It comprises a cylindrical frame that holds the mesh member so that it can be inserted and removed,
The outer diameter of the inflow opening end of the mesh member is larger than the outer diameter of the general portion of the mesh member so that the outer periphery of the inflow opening end of the mesh member is joined or close to the inner periphery of the opening of the frame. the diameter,
When the outer diameter of the general portion of the cylinder is Ds, the outer diameter of the end of the inflow opening of the cylinder is Da, the inner diameter of the opening of the frame is Df, and the opening width of the mesh member is M, Ds <(Df−M) ≦ Da,
A screen for a strainer , wherein the diameter of the inflow opening end portion is increased in a tapered shape from the other end side to the one end side of the cylindrical body . The cylinder body and the bottom plate of the mesh member can be separated,
A ring-shaped bearing ring having a bearing surface for supporting the bottom plate; a ring-shaped opening ring having an opening that surrounds an inflow opening end of the cylindrical body; and the bearing ring and the opening ring. The strainer screen according to claim 1 , further comprising a plurality of ribs that 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 screen according to claim 2, wherein the rib is provided so as to be attachable to a support surface of the support ring. An outer member formed of a metal punch plate having a large number of small holes, and an inner side formed of a metal net attached by welding to the inner side of the outer member. The strainer screen according to claim 2 , wherein the screen is provided with a member. A strainer comprising the strainer screen according to any one of claims 1 to 4 .

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