Strainers and stoppers for strainer screens

Abstract

To improve manufacturing efficiency, operability and durability.SOLUTION: A strainer comprises: a main body 1 comprising a flow path R having an inflow port 2 and an outflow port 3; a screen 10 provided inside the flow path R of the main body 1; a lid 5, formed in the main body 1, which closes a hole 4 which the screen 10 gets in and out; an end part holding part 20, provided in the main body 1, on which an opening end part 14 of the screen 10 is held; a stopper T holding a bottom part 12 of the screen 10; and a stopper holding part 30 holding a lower end part 41 of the stopper T. The stopper holding part 30 is constituted of grooves formed by cutting off an inner surface side of a wall part forming the flow path R of the main body 1 and extended in a width direction which is orthogonal to a longitudinal direction of the flow path, and the lower end part 41 of the stopper T is formed so that the part can be inserted into the stopper holding part 30 and locked thereto.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a strainer having a screen for filtering out foreign matter such as dust contained in a fluid such as water or oil in a pipeline through which the fluid flows, and a screen stopper for the strainer. [Background technology]

[0002] Conventionally, as this type of strainer, for example, a strainer previously proposed by the applicant of the present application is known (published in Japanese Patent No. 4272907). As shown in Fig. 9(a), this strainer Sa comprises a main body 100 made of cast iron and provided with a flow path R having an inlet 101 and an outlet 102, a cup-shaped screen 110 provided in the flow path R of the main body 100 and having an opening 111 and a bottom 112, an entrance / exit hole 103 provided in the wall of the main body 100 for inserting and removing the screen 110, a removable lid 104 for closing the entrance / exit hole 103, and the screen 110 on the inner surface of the wall forming the flow path R on the inlet 101 side of the main body 100. the end holding portion 105 into which the opening end 113 of the screen 110 is inserted and held; a stopper Ta which is inserted through the inlet / outlet hole 103 and presses against the bottom 112 of the screen 110 to prevent the screen 110 from slipping out of the end holding portion 105; and a stopper holding portion 120 which forms the flow path R of the main body 100, is located on the wall facing the inlet / outlet hole 103 and is closer to the outlet 102 than the bottom 112 of the screen 110 held by the end holding portion 105, and holds the lower end 130 of the stopper Ta.

[0003] The stopper Ta is, for example, a stainless steel rod, and has a male screw portion 131 at a lower end 130 and a bolt head 132 at an upper end that is rotated by a fastener. The stopper holding portion 120 is formed of a female screw portion 121 into which the male screw portion 131 of the stopper Ta is screwed. This female screw portion 121 is formed in a brass bush 123 provided on the wall of the main body 100. The stopper Ta is provided with a pair of upper and lower truncated cone portions 133 that are flared toward the upper end side. When the stopper Ta is screwed into the female screw portion 121, the tapered surface of the truncated cone portion 133 is pressed against the tapered surface formed on the bottom portion 112 of the screen 110, and the open end 113 of the screen 110 is pressed against the end holding portion 105, thereby restricting the screen 110 from coming off the end holding portion 105.

[0004] In the stopper holding portion 120, the bushing 123 has a male thread 124 formed on the outside, a bolt head 125 at one end, and a female thread portion 121 formed coaxially with the male thread 124 at the other end. As shown in FIG. 9(b), a through hole 126 is opened from the outside at a required location of the main body 100 with a drill D, a female thread 127 is formed in this through hole 126 with a tap (not shown), and the male thread 124 is screwed into this female thread 127, thereby fixing the bushing to the main body 100.

[0005] The reason why the female screw portion 121 is made to function by forming the female screw portion 121 in the bush 123 and attaching the bush 123 to the main body 100 is as follows. That is, it is originally desirable to directly form the female screw portion 121 on the inner surface side of the wall of the main body 100, but in that case, a drill (not shown) must be inserted through the entrance / exit hole 103, a hole must be made on the inner surface side of the wall of the main body 100 with the drill, and the female screw portion 121 must be formed in the hole with a tap (not shown). However, since there is a limit to the size of the entrance / exit hole 103, machining the female screw portion 121 from the entrance / exit hole 103 in this way makes it extremely difficult to form the hole or the female screw portion 121 because the holding head (not shown) of the drill that makes the hole hits the entrance / exit hole 103 or the holding head of the tap that forms the female screw portion 121 hits the entrance / exit hole 103. Therefore, the bush 123 is used as a last resort. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4272907 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in this conventional strainer Sa, because the bush 123 is attached to the main body 100, the number of parts increases, the number of manufacturing steps increases, and the work becomes complicated, which leads to higher costs and poorer manufacturing efficiency. Also, when attaching or removing the screen 110, the stopper Ta is also attached or removed, but in the conventional strainer Sa, the male threaded portion 131 of the stopper Ta is screwed into or loosened from the female threaded portion 121 to attach or remove it from the main body 100, which makes the attachment and removal work more complicated and reduces operability.

[0008] Furthermore, because the main body 100 is made of cast iron, when the fluid is water, the female thread 127 of the main body 100 that comes into contact with the male thread 124 of the bush 123 may rust, resulting in a problem of inferior durability. For this reason, the inner surface of the wall of the main body 100 that forms the flow path R is sometimes coated, but the coating is not sufficient in the female thread 127 portion, so rusting is likely to occur.

[0009] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a strainer and a stopper for a screen of a strainer which are improved in manufacturing efficiency, operability and durability. [Means for solving the problem]

[0010] In order to achieve the above object, the strainer of the present invention comprises a main body having a flow passage with an inlet and an outlet, a cup-shaped screen having an opening and a bottom provided within the flow passage of the main body, an access hole provided in a wall of the main body for inserting and removing the screen, a removable lid for closing the access hole, an end holding portion into which the open end of the screen is inserted and held on the inner surface side of the wall portion forming the flow passage on the inlet side of the main body, a stopper inserted through the access hole and pressing down on the bottom of the screen to prevent the screen from slipping out of the end holding portion, and a stopper holding portion provided on a wall portion forming the flow passage of the main body and facing the access hole, the stopper holding a lower end of the stopper the stopper holding portion is formed by cutting an inner surface side of a wall portion forming the flow passage of the main body and is configured as a groove extending in a width direction perpendicular to a front-rear direction of the flow passage, The lower end of the stopper is configured to be inserted into and engaged with the stopper holding portion.

[0011] As a result, when the strainer body is manufactured, a stopper holding portion is formed at a required portion on the inner surface side of the wall of the body. In this case, the stopper holding portion is formed of a groove extending in the width direction perpendicular to the front-rear direction of the flow passage, and is not a drilled hole, so that it can be easily machined, for example, by inserting a well-known slot cutter from the outlet. Meanwhile, the stopper is formed with a shape such that its lower end portion engages with the groove of the stopper holding portion. Therefore, it is not necessary to form a female thread on the body and provide a bush having a male thread that screws into the female thread and a female thread portion in the center, as in the conventional method, so that the number of parts is reduced and the manufacturing man-hours are also reduced, thereby improving manufacturing efficiency.

[0012] When the screen is to be attached to the main body, the lid is removed to open the entrance / exit hole. In this state, the screen is inserted into the main body through the entrance / exit hole and the open end of the screen is inserted into the end holding part, and then the stopper is inserted through the entrance / exit hole and its lower end is inserted into the stopper holding part to lock it and press the bottom of the screen. After that, the lid is placed on the entrance / exit hole to close it. In this case, the stopper only needs to have its lower end inserted into the stopper holding part consisting of a groove, so that the stopper can be attached extremely easily compared to the conventional case where it is attached by screwing it into a female screw part, and operability can be improved. On the other hand, when the screen is to be removed for cleaning or replacement, the lid is removed to open the entrance / exit hole. In this state, the stopper is lifted from the entrance / exit hole and its lower end is removed from the stopper holding part to remove it. In this case too, the stopper can be removed simply by pulling its lower end out of the stopper holding portion consisting of a groove, making it extremely easy to remove compared to the conventional method of loosening and removing the stopper from the female thread portion, thereby improving operability in this respect as well.

[0013] When this strainer is in use, as the fluid flows from the inlet through the flow path to the outlet, foreign matter mixed in the fluid is filtered by the screen. In this case, if the fluid is water, with use over time, in the past, when the main body was made of cast iron, the female thread of the main body that contacted the male thread of the bush would rust even if the inner surface of the wall of the main body that constitutes the flow path was coated. However, in the present invention, there is no screw means and the stopper holding portion is a groove, so there is almost no risk of rusting, and durability can be improved accordingly.

[0014] In the configuration of the present invention, it is effective that the stopper holder is formed by inserting a slot cutter machined into a predetermined shape from the outlet side so that its rotation axis is aligned with the front-rear direction of the flow path, rotating it, and cutting the inner surface of the wall of the main body, and the bottom surfaces on both ends in the width direction are formed into an arc shape. In this way, when forming the stopper holder, the slot cutter is inserted into the inside from the outlet and pressed against the inner wall surface of the main body, or moved left and right in the width direction while pressing the slot cutter, to machine the required groove. Therefore, it is possible to reliably improve manufacturing efficiency.

[0015] If necessary, a bulging portion is formed by bulging the inner surface of the wall portion facing the inlet / outlet hole toward the flow path, and a support surface for supporting the bottom side outer peripheral surface of the screen is formed on the bulging portion, and the stopper holding portion is formed on the bulging portion. As a result, since the stopper holding portion is formed on the bulging portion, the bulging portion is higher than the general surface of the inner wall surface, making it easier to process the groove as the stopper holding portion, and in this respect, manufacturing efficiency can also be improved. In addition, the groove does not make the wall portion of the main body thinner, which is preferable in terms of strength. Furthermore, since the bottom side outer peripheral surface of the screen is supported by the support surface formed on the bulging portion, the screen can be held reliably.

[0016] Furthermore, the inlet / outlet hole is formed in a circular shape, and a collision stopper that hits the wall surface that forms the inlet / outlet hole is provided at the upper end of the stopper, and the collision stopper is provided at intervals along the circumferential direction of the inlet / outlet hole. As a result, when the strainer is used, when a fluid flows from the inlet through the flow path toward the outlet, foreign matter mixed in the fluid is filtered by the screen. In this case, the screen is pressed toward the outlet side by the fluid, but the collision stopper hits the wall surface that forms the inlet / outlet hole, and the screen can be held securely together with the stopper holding part. In addition, since the inlet / outlet hole is circular, if there is only one collision stopper, the stopper will try to swing in the width direction with the stopper holding part as a fulcrum, but since there are multiple collision stoppers at intervals, when they hit the wall surface that forms the inlet / outlet hole, the swinging in the width direction can be suppressed, and therefore the stopper is stable and the screen can be held securely.

[0017] Furthermore, the stopper holding portion is configured as a groove having an arc-shaped bottom surface, and the outer edge of the lower end side of the stopper is formed in the same arc shape as the bottom surface of the groove. This allows the groove to be formed simply by pressing the slot cutter against the inner wall surface of the main body without moving it left and right, making manufacturing easier. Also, the lower end of the stopper engages along the bottom surface of the groove, so the stopper can be stably supported.

[0018] Furthermore, as required, the stopper is configured to have a main body formed of a rod-shaped member, the lower end side of which is bent into a U-shape, and has a pair of abutment rods formed at the same height on both sides and capable of abutting against the bottom of the screen. Since the stopper can be made by bending a rod-shaped member, it can be manufactured extremely easily, and manufacturing efficiency can be further improved.

[0019] Furthermore, if necessary, the entrance / exit hole may be formed in a circular shape, and an impact stopper may be provided at the upper end of the stopper to impact the wall surface that defines the entrance / exit hole, the impact stopper being configured by the upper ends of the pair of abutment rods. The impact stopper can be easily formed, which also makes manufacturing extremely easy.

[0020] Furthermore, a horizontal rod made of a rod-shaped member is installed between the upper ends of the pair of abutment rods. This allows the stopper to be attached or removed by gripping the horizontal rod, further improving operability. Also, the abutment rod can be reinforced, improving the strength of the stopper.

[0021] In order to achieve the above object, the screen stopper of the strainer of the present invention is configured to be applied to the stopper holding portion configured with a groove having a circular arc-shaped bottom surface, and is configured with a main body formed by bending a rod-shaped member into a U-shape. As described above, it is easy to manufacture, so manufacturing efficiency can be improved and operability can be improved. In addition, because it is U-shaped, it has high strength and durability can be improved. Effect of the Invention

[0022] As described above, according to the present invention, the stopper holding means can be easily formed on the main body without using screw means, and the stopper can be attached and removed without using screw means, thereby improving manufacturing efficiency, operability, and durability. [Brief description of the drawings]

[0023] [Figure 1] 1 is a cross-sectional perspective view showing a strainer according to an embodiment of the present invention. [Diagram 2] 1A and 1B show a strainer according to an embodiment of the present invention, in which FIG. 1A is a side cross-sectional view, and FIG. [Diagram 3] 1 is a plan view showing a strainer according to an embodiment of the present invention with a lid open; [Figure 4] 1 is a side cross-sectional view showing a state in which a stopper holding portion is machined on a main body in a strainer according to an embodiment of the present invention. FIG. [Diagram 5] 1A, 1B, and 1C show a screen stopper for a strainer according to an embodiment of the present invention, in which FIG. [Figure 6] 1A and 1B are diagrams showing a state in which a stopper is attached to a strainer according to an embodiment of the present invention, in which (a) is a perspective view of a main portion, and (b) is a cross-sectional view of the main portion as viewed from the inlet side. [Figure 7] FIG. 4 is a main part view showing a strainer according to another embodiment of the present invention. [Figure 8] 13A and 13B are diagrams showing a screen stopper according to another embodiment of the present invention. [Figure 9] FIG. 1 shows an example of a conventional strainer, where (a) is a side cross-sectional view, and (b) is a side cross-sectional view showing the state when the body is processed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A strainer according to an embodiment of the present invention and a stopper for a screen of the strainer used therein will be described in detail below 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 this strainer S comprises a main body 1 having a flow path R with an inlet 2 and an outlet 3, and a cup-shaped screen 10 provided in the flow path R of the main body 1, the screen having an opening 11 and a bottom 12.

[0025] More specifically, the main body 1 is a pipe having its flow path R in a straight line shape, and is formed, for example, from cast iron. The inlet 2 and outlet 3 of the main body 1 are integrally formed with flanges at their outer edges, respectively, which are attached to other pipes by fastening with bolts and nuts. The side wall of the main body 1 is provided with an entrance / exit hole 4 for inserting and removing the screen 10, and is provided with a removable lid 5 for closing the entrance / exit hole 4. The entrance / exit hole 4 is formed in a circular shape.

[0026] The lid 5 is formed of the same casting as the main body 1. A plurality of female threads 6 for fixing the lid 5 are formed around the access hole 4 of the main body 1, and holes (not shown) are formed in the lid 5 at positions corresponding to the female threads 6, and the lid 5 can be fixed by inserting bolts 8 with nuts 7 through the holes and screwing the bolts 8 into the female threads 6 and tightening the nuts 7. In addition, an O-ring 9 for sealing is provided on the contact surface between the lid 5 and the main body 1.

[0027] The screen 10 includes a cup body 13 made of a metal such as stainless steel. The cup body 13 has many small holes formed therein, and a net 13a is provided inside the small holes to filter and separate foreign matter such as dust contained in the fluid flowing through the flow path R. The outer periphery of the open end 14 of the cup body 13 and the outer periphery of the bottom 12 are reinforced by stainless steel ring-shaped reinforcing bodies 15, 16. Reference numeral 17 denotes a handle provided on the outer surface of the cup body 13 and held when inserting or removing the screen 10 from the entrance / exit hole 4.

[0028] An end holder 20 into which the open end 14 of the screen 10 is inserted and held is formed on the inner surface of the wall portion that forms the flow path R on the inlet 2 side of the main body 1. A sealing O-ring 21 is attached to the outer periphery of the reinforcing body 15 that constitutes the open end 14 of the screen 10, and this O-ring 21 is brought into elastic contact with the inner periphery of the end holder 20 to prevent the fluid from passing outside the screen 10.

[0029] Furthermore, a bulge 22 that bulges out toward the flow path R is formed on the inner surface of the wall portion that forms the flow path R on the outlet 3 side of the main body 1 and faces the inlet / outlet hole 4, and a support surface 23 that supports the outer peripheral surface 18 of the reinforcement body 16 on the bottom 12 side of the screen 10 is formed on this bulge 22.

[0030] In addition, this strainer S is equipped with a stopper T according to an embodiment of the present invention which is inserted through the inlet / exit hole 4 and presses the bottom 12 of the screen 10 to prevent the screen 10 from slipping out of the end holding portion 20, and a stopper holding portion 30 which forms the flow path R of the main body 1, is located on the wall side facing the inlet / exit hole 4, and is closer to the outlet 3 than the bottom 12 of the screen 10 held by the end holding portion 20, and holds the lower end 41 of the stopper T.

[0031] The stopper holding portion 30 is a wall portion forming the flow path R of the main body 1, and is formed by cutting the inner surface side of the bulging portion 22, and is configured as a groove extending in the width direction perpendicular to the front-rear direction of the flow path R. In detail, as shown in FIG. 4, the stopper holding portion 30 is formed by inserting a slot cutter C processed into a predetermined shape from the outlet 3 side so that its rotation axis Ca is along the front-rear direction of the flow path R and rotating it, and cutting the inner surface of the wall portion of the main body 1, and the bottom surfaces on both ends in the width direction are formed in an arc shape. That is, the stopper holding portion 30 is processed and formed into a required groove shape by inserting the slot cutter C into the inside from the outlet 3, pressing the slot cutter C against the inner wall surface of the bulging portion 22 of the main body 1, or by moving the slot cutter C left and right in the width direction while pressing it. In the embodiment, the stopper holding portion 30 is formed by pressing the slot cutter C against the inner wall surface of the main body 1 without moving it left and right, and the bottom surface is configured as an arc-shaped groove. The inner surface of the wall of the main body 1 constituting the flow passage R may be left as is, but may also be coated with electrostatic painting or the like.

[0032] The stopper T according to the embodiment of the present invention is formed so that its lower end 41 can be inserted into and locked in the stopper holding portion 30. More specifically, as shown in Fig. 5, the stopper T is configured to include a main body 40 formed of a stainless steel rod-shaped member, and the lower end 41 side is bent into a U-shape with the same height on both sides, and the main body 40 has a pair of abutment rods 42 that can abut against the bottom 12 of the screen 10. The outer edge of the U-shaped lower end 41 side of the stopper T is formed into the same arc shape as the bottom surface of the groove of the stopper holding portion 30.

[0033] Further, the upper end of the stopper T is provided with an impact stopper portion 43 that impacts against the wall surface that forms the entrance / exit hole 4, and a plurality of these impact stopper portions 43 are provided at intervals along the circumferential direction of the entrance / exit hole 4. In the embodiment, the impact stopper portions 43 are formed by the upper ends of a pair of abutment rods 42.

[0034] Furthermore, a horizontal rod 44 made of a stainless steel rod-shaped member is installed by welding between the upper ends of the pair of contact rods 42. The horizontal rod 44 is curved so as to be convex toward the inlet 2 side of the main body 40. This can reinforce the contact rod 42 and improve the strength of the stopper T.

[0035] Therefore, when the stopper holding portion 30 is produced in the production of the main body 1 of the strainer S according to the embodiment, as shown in FIG. 4, the slot cutter C processed into a predetermined shape is inserted from the outlet 3 side so that its rotation axis Ca is aligned with the front-rear direction of the flow path R, and rotated, and the slot cutter C is pressed against the inner surface of the bulge portion 22 provided on the side facing the inlet / outlet hole 4 of the main body 1 to form a groove by cutting. The bottom surface of the groove is formed in an arc shape corresponding to the blade shape of the slot cutter C. In this case, since it is only necessary to insert the slot cutter C from the outlet 3 and press it against the bulge portion 22, it is not necessary to form a female thread in the main body and provide a bush having a male thread that screws into the female thread and a female thread portion in the center, as in the conventional method. This reduces the number of parts and the manufacturing man-hours, thereby improving the manufacturing efficiency. In addition, since the stopper holding portion 30 is formed in the bulging portion 22, the bulging portion 22 is higher than the general surface of the inner wall, which makes it easier to process the groove for the stopper holding portion 30, thereby improving manufacturing efficiency. In addition, the groove does not reduce the thickness of the wall of the main body 1, which is also preferable in terms of strength.

[0036] On the other hand, as shown in Fig. 5, the stopper T is formed so that its lower end 41 is shaped to engage with the groove of the stopper holding portion 30. That is, the main body 40 of the stopper T is fabricated by bending a rod-shaped member into a U-shape. At this time, the outer edge of the main body 40 on the side of the lower end 41 is formed into the same arc shape as the bottom surface of the groove. Then, the horizontal rod 44 is attached to the main body 40 by welding. In this case, since the main body 40 can be fabricated by bending it into a U-shape and the impact stopper portion 43 can also be fabricated at the same time, the fabrication can be carried out extremely easily and the fabrication efficiency can be improved.

[0037] When the screen 10 is to be attached to the main body 1, the lid 5 is removed to open the entrance / exit hole 4, as shown in Figures 1, 2, 3 and 6. In this state, the screen 10 is inserted into the main body 1 through the entrance / exit hole 4 by holding the handle 17, and the open end 14 of the screen 10 is inserted into the end holder 20, and the outer peripheral surface 18 on the bottom 12 side of the screen 10 is supported by the support surface 23 formed on the bulge 22. Next, the stopper T is inserted through the entrance / exit hole 4 by holding the horizontal rod 44, and its lower end 41 is inserted and engaged into the stopper holder 30 to hold the bottom 12 of the screen 10. After that, the lid 5 is placed on the screen 10 to close the entrance / exit hole 4.

[0038] In this case, the stopper T only needs to have its lower end 41 inserted into the stopper holding portion 30 consisting of a groove, so that mounting can be performed extremely easily compared to the conventional mounting by screwing into a female thread portion, and operability can be improved. Also, the stopper T can be mounted by gripping the horizontal rod 44, which also improves operability. In this case, the horizontal rod 44 is curved so as to be convex toward the inlet 2 side of the main body 40, so that it is easy to hold and the hand is less likely to hit the inlet / outlet hole 4, etc., and operability can be further improved.

[0039] When the strainer S is used, the fluid flows from the inlet 2 through the flow path R toward the outlet 3, and in this state, foreign matter mixed in the fluid is filtered by the screen 10. In this case, the outer peripheral surface 18 on the bottom 12 side of the screen 10 is supported by the support surface 23 formed on the bulge 22, so that the screen 10 can be held reliably. Also, since the outer edge on the lower end 41 side of the main body 40 of the stopper T is formed in the same arc shape as the bottom surface of the groove, the lower end 41 of the main body 40 engages along the bottom surface of the groove, so that the stopper T can be stably supported and the screen 10 can be held reliably.

[0040] In this case, the screen 10 is pushed toward the outlet 3 by the fluid, but the collision stopper 43 comes into contact with the wall surface forming the entrance / exit hole 4, and this, together with the holding of the stopper holding part 30, ensures that the screen 10 is held down. Furthermore, since the entrance / exit hole 4 is circular, if there is only one collision stopper 43, the stopper T will attempt to swing in the width direction with the stopper holding part 30 as the fulcrum, but since there are multiple collision stoppers 43 spaced apart, when these collide with the wall surface forming the entrance / exit hole 4, the swinging in the width direction can be prevented, and therefore the stopper T becomes stable and the screen 10 can be held down reliably.

[0041] Furthermore, in the past, when the fluid is water, if the main body was made of cast iron, the female thread of the main body that comes into contact with the male thread of the bush would rust over time even if the inner surface of the wall of the main body 1 that constitutes the flow path R was coated. However, in the present invention, there is no screw means and the stopper holding portion 30 is a groove, so there is almost no need to worry about rusting, and durability can be improved accordingly.

[0042] Furthermore, when the screen 10 is to be removed for cleaning or replacement, the cover 5 is removed to open the entrance / exit hole 4. In this state, the stopper T is lifted from the entrance / exit hole 4 by holding the horizontal rod 44, and the lower end 41 is removed from the stopper holding part 30. In this case, the stopper T only needs to be removed by removing the lower end 41 from the stopper holding part 30 which is made of a groove, so that the stopper can be removed very easily compared to the conventional case where the stopper is loosened and removed from the female screw part, and the operability can be improved. In addition, the horizontal rod 44 of the stopper T can be gripped and attached, which also improves the operability. At this time, the horizontal rod 44 is curved so as to be convex toward the inlet 2 side of the main body 40, so that it is easy to hold and the hand is unlikely to hit the entrance / exit hole 4, etc., and the operability can be further improved. When the screen 10 is attached again, the same procedure is followed as above.

[0043] Fig. 7 shows a strainer S according to another embodiment. This is formed in a manner similar to that described above, but unlike the above, the bottom surface of the groove of the stopper holding portion 30 is formed in a flat shape. The slot cutter C is inserted into the inside from the outlet 3, and the slot cutter C is moved left and right in the width direction while being pressed against the inner wall surface of the bulging portion 22 of the main body 1 to form the strainer S. Meanwhile, the lower end portion 41 of the stopper T is also formed in a straight line accordingly. This also provides the same action and effect as the above.

[0044] Fig. 8 shows another example of the stopper T. This is composed of a crescent-shaped lower end member 50 having an arc-shaped lower end portion 41 on the lower surface, the bottom surface of the stopper holding portion 30 engaging with the arc-shaped groove, a single abutment member 51 erected in the center of the lower end member 50 and abutting against the bottom portion 12 of the screen 10, a horizontal rod 52 provided at the upper end of the abutment member 51, and a pair of rod-shaped impact stoppers 53 erected on the left and right ends of the horizontal rod 52, respectively. This also provides the same action and effect as above.

[0045] In the above embodiment, the shape of the stopper T and the shape of the groove of the stopper holding part 30 are not limited to those described above and may be modified as appropriate. For example, the shape of the groove of the stopper holding part 30 may be formed into an elongated groove having an arc-shaped bottom surface at both ends in the width direction and a flat surface in the middle by inserting the slot cutter C into the inside from the outlet 3 and moving the slot cutter C left and right in the width direction while pressing it against the inner wall surface of the main body 1, and may be modified as appropriate. Those skilled in the art can easily make many modifications to these exemplary embodiments without substantially departing from the novel teachings and effects of the present invention, and many of these modifications are included in the scope of the present invention. [Explanation of symbols]

[0046] S strainer 1 Main unit 2 Inlet 3 Outlet R flow path 4 Entry / exit hole 5 Lid 6 Female thread 7 Nut 8 Volts 9 O-ring 10 Screens 11 Aperture 12 Bottom 13 Cup Body 13a Net 14 Open end 15 Reinforcement 16 Reinforcement 17 Handle 18 Outer surface 20 End holding part 21 O-ring 22 Bulge 23 Bearing surface 30 Stopper holding part C slot cutter Ca rotation axis T stopper 40 Subject 41 Lower end 42 Abutting rod 43 Stop part 44 Horizontal rod 50 lower end material 51 When connecting parts and materials 52 Crossbar 53 Stop

Claims

1. a main body having a flow path with an inlet and an outlet, a cup-shaped screen having an opening and a bottom provided within the flow path of the main body, an access hole provided in a wall of the main body for inserting and removing the screen, a removable lid for closing the access hole, an end holding part into which the open end of the screen is inserted and held on the inner surface side of the wall part forming the flow path on the inlet side of the main body, a stopper inserted through the access hole and pressing the bottom of the screen to prevent the screen from slipping out of the end holding part, and a stopper holding part provided on a wall part forming the flow path of the main body and facing the access hole, the stopper holding part being provided on the outflow outlet side of the bottom of the screen held by the end holding part, the stopper holding portion is formed by cutting an inner surface side of a wall portion forming the flow passage of the main body and is configured as a groove extending in a width direction perpendicular to a front-rear direction of the flow passage, The strainer is characterized in that a lower end portion of the stopper is formed so as to be inserted into and engaged with the stopper holding portion.

2. The strainer of claim 1, characterized in that the stopper holding portion is formed by inserting a slot cutter machined into a predetermined shape from the outlet side so that its rotating axis runs along the front-to-rear direction of the flow path and rotating it, and by cutting the inner surface of the wall portion of the main body, and the bottom surfaces on both ends in the width direction are formed into an arc shape.

3. A strainer as described in claim 1 or 2, characterized in that a bulged portion is formed by bulging the inner surface of the wall portion facing the inlet / outlet hole toward the flow path, a support surface for supporting the bottom side outer peripheral surface of the screen is formed on the bulged portion, and the stopper retaining portion is formed on the bulged portion.

4. A strainer as described in any one of claims 1 to 3, characterized in that the entrance / exit hole is formed in a circular shape, and an impact stop portion is provided at the upper end of the stopper to impact against the wall surface forming the entrance / exit hole, and a plurality of such impact stop portions are provided at intervals along the circumferential direction of the entrance / exit hole.

5. The stopper holding portion is configured as a groove having an arc-shaped bottom surface, 5. The strainer according to claim 1, wherein an outer edge of the lower end portion of the stopper is formed into the same arc shape as the bottom surface of the groove.

6. The strainer according to claim 5, characterized in that the stopper is configured to have a main body formed from a rod-shaped member, the lower end side being bent into a U-shape, and having a pair of abutment rods formed at the same height on both sides and capable of abutting the bottom of the screen.

7. A strainer as described in claim 6, characterized in that the entrance / exit hole is formed in a circular shape, and an impact stopper is provided at the upper end of the stopper to impact against the wall surface forming the entrance / exit hole, and the impact stopper is formed by the upper ends of the pair of abutment rods.

8. 8. The strainer according to claim 6, further comprising a horizontal rod formed of a rod-shaped member and disposed between the upper ends of the pair of contact rods.

9. A stopper for a screen of a strainer according to any one of claims 6 to 8.

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