JP2013103195A - Strainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working efficiency by fitting and removing a screen by a manual operation and secure filtering performance by securely pressing the screen even by the manual operation.SOLUTION: This strainer includes: a body 1 having a flow passage 4 with an inflow port 2 and an outflow port 3; the cup-shaped screen 50 installed within the flow passage 4 of the body 1 and having an inflow opening 51 and a bottom 51a; a hole portion 10 installed on the side face of the body 1 to take in/out the screen 50; and an attachable/detachable lid 11 for closing the hole portion 10. An end holding portion 6 to which an opening end 55 of the screen 50 is inserted is formed on the inner side of an inner wall forming the flow passage 4 on the inflow port 2 side of the body 1, and a seal ring 56 coming into elastic contact with the inner peripheral face of the end holding portion 6 is installed on the outer periphery of the opening end 55 of the screen 50. A coming-off prevention means 60 which prevents the opening end 55 of the screen 50 from coming off from the end holding portion 6 and is attachable/detachable manually is installed in the body 1.

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, a strainer previously proposed by the applicant of the present application is known (published in Japanese Patent No. 4272907). As shown in FIG. 15, 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 hole 203 for inserting and removing the screen 210 is formed on the side wall, and the inside of the side wall forming the channel on the inlet 201 side is formed. 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 attached is formed around the periphery, and the inner wall that forms the flow path is connected to the axis of the main body 200 when inserted. Guide projections 206 are provided to support and guide the screen 210 so that the axis of the screen 210 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.

  Further, a pressing means 220 that presses the inflow opening end surface 212 of the screen 210 against the receiving surface 204 of the main body 200 is provided. 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. The pressing member 226 includes a rear ring-shaped frame 210a.

  The strainer Sa includes a lid 207 that opens and closes the hole 203. A female screw 230 for fixing the lid 207 is formed around the hole 203 of the main body 200, and a male screw 231 is screwed into the female screw 230 and is erected. The lid 207 is formed with a through hole 232 through which the male screw 231 is inserted. The male screw 231 is inserted into the through hole 232 so that the lid 207 is covered with the hole 203, and then the nut 233 is attached to the male screw 231. The lid 207 is fixed by tightening. For example, eight sets of the male screw 231 and the nut 233 are provided in an equiangular relationship. A ring-shaped packing 234 is interposed on the contact surface around the lid 207 and the hole 203 to prevent the fluid from flowing out of the main body 200.

When the screen 210 is attached to the main body 200, the lid 207 is removed and the hole 203 is opened. In this case, the nut 233 is loosened with respect to the male screw 231 with a tightening tool such as a spanner, the nut 233 is removed, and then the lid 207 is removed.
Next, the screen 210 is inserted into the main body 200 through the hole 203 and placed on the guide protrusion 206, and the inflow opening end surface 212 of the screen 210 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 placed over the hole 203 to close the hole 203. Thereafter, the nut 233 is screwed into the male screw 231 using a tightening tool such as a spanner, and the lid 207 is fixed to the main body 200.
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.
Further, when foreign matter such as dust accumulates on the screen 210 and the screen 210 is washed or replaced, the lid 207 is removed and the hole 203 is opened. In this case, the nut 233 is loosened with respect to the male screw 231 with a tightening tool such as a spanner, the nut 233 is removed, and then the lid 207 is removed. Then, the bolt head 223 is rotated with a tightening tool to loosen the male screw portion 222 of the bolt 224 with respect to the female screw portion 221 of the main body 200, the bolt 224 is removed, and the pressing of the pressing member 226 by the truncated cone portion 225 is released. Remove the screen 210, clean the screen 210 or replace it with a new one, and reattach the screen 210 as described above.

Japanese Patent No. 4272907

However, in this conventional strainer Sa, the lid 207 is removed when the screen 210 is attached to the main body 200 or when foreign matter such as dust accumulates on the screen 210 and the screen 210 is cleaned or replaced. Then, the bolt head 223 is rotated with a tightening tool to loosen the male threaded portion 222 of the bolt 224 with respect to the female threaded portion 221 of the main body 200, the bolt 224 is removed, and the pressing of the pressing member 226 by the truncated cone portion 225 is released. Then, the screen 210 is taken out. In this state, the screen 210 is cleaned or replaced with a new one, and the male screw portion 222 of the bolt 224 is again 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 fastening tool. Then, the bolt 224 is screwed into the main body 200.
Therefore, in attaching and removing the screen 210, the bolts 224 must be loosened and tightened with a tightening tool such as a spanner one by one, and there has been a problem that the work is complicated accordingly.

  The present invention has been made in view of such problems, and is capable of mounting and removing the screen by manual operation to improve workability and ensure the screen even by manual operation. The purpose of the present invention is to provide a strainer that secures the filtration function.

In order to achieve such an object, a strainer according to the present invention has a main body having a flow path having an inlet and an outlet, and a cup-like shape provided in the flow path of the main body and having an inflow opening and a bottom. An inner wall that forms a flow path on the inlet side of the main body, comprising a screen, a hole provided on a side surface of the main body, and a detachable lid that closes the hole. In a strainer that forms an end holding portion into which the opening end of the screen is inserted,
A seal ring that elastically contacts the inner peripheral surface of the end holding portion is provided on the outer periphery of the opening end portion of the screen, and the manual operation for preventing the opening end portion of the screen from coming out of the end holding portion on the main body. And is provided with a detachable retaining means.

  Thus, when the screen is mounted on the main body, the lid of the main body is removed to open the hole, the screen is inserted into the flow path from the hole, and the opening end of the screen is inserted into the end holding portion of the main body. . Next, the retaining means is manually attached and the lid is closed again. In this case, since the retaining means can be manually mounted, the mounting of the screen with the lid opened is very simple compared to the conventional case, and the workability can be improved.

  Further, when the lid is closed, the screen is prevented from being removed by the retaining means, so that the opening end portion of the screen is held in the end holding portion of the main body. For this reason, the seal ring provided on the outer periphery of the opening end of the screen is elastically contacted with the inner peripheral surface of the end holding portion, and this state is maintained. It is possible to prevent a situation in which dust or the like passes from between the outer periphery of the opening end and the inner periphery of the end holding portion, thereby causing poor filtration, and the screen can be reliably captured. In other words, even if a fine mesh is used for the screen net, foreign matter such as dust that is coarser than this mesh does not escape from between the opening end portion of the screen and the end holding portion. It becomes possible to respond.

  When dust is collected on the mesh member of the screen due to the use of the strainer, the screen is washed or often damaged or broken. In this case, the mesh member is replaced. In this case, the lid is removed from the hole of the main body, the retaining means is manually removed, and the screen is taken out. At this time, since the retaining means can be removed manually, it is extremely simple as compared with the prior art, and the workability can be improved. Next, in the same manner as described above, the screen is put into the flow path from the hole, and the opening end of the screen is inserted into the end holding portion of the main body. Next, the retaining means is manually attached and the lid is closed again. In this case, since the retaining means can be manually mounted, the mounting of the screen with the lid opened is very simple compared to the conventional case, and the workability can be improved.

  And, if necessary, the retaining means includes an insertion hole provided on the inner wall forming the flow path of the main body on the outlet side from the bottom of the screen, and one end inserted through the insertion hole. A presser foot for pressing the bottom of the screen is provided. According to this, since the presser foot can be attached / detached only by inserting / removing the presser foot into / from the insertion hole, the work is extremely simple, and the workability can be further improved.

  Further, if necessary, the insertion hole is provided on a portion of the inner wall that forms the flow path of the main body and that faces the lid attached to the main body, and the other end of the presser foot is the attached lid. It is set as the structure formed so that latching was possible. Since one end of the presser foot is held by the insertion hole and the other end is held by being held by the lid, the presser foot is held stably and the screen can be reliably pressed.

Further, if necessary, the retaining means is provided concentrically on the presser foot and extends toward the other end of the presser foot, and on the bottom of the screen. And a pressing member that contacts the surface and presses the other end of the presser foot toward the lower surface of the lid by moving the screen toward the outlet.
Thereby, even if the screen is pushed to the outlet side by the fluid, the pressing member of the screen gradually pushes up the tapered surface of the truncated cone portion of the presser foot, so that the presser foot is further pressed by the lid. The screen is prevented from moving.
In this case, it is effective that the pressing member is composed of a ring-shaped frame fixed on the outer periphery of the bottom. Since the frame is integrated with the screen, a situation where the flow path is obstructed is prevented.

  In the present invention, the lid can be inserted into a predetermined depth position of the hole, and a seal member that elastically contacts the other is provided on either the inner periphery of the hole or the outer periphery of the lid. A groove is formed along the inner periphery of the lid body that is inserted into the upper surface, and is disposed on the lid, and is formed of a spring material and is expanded in diameter. It is effective to provide a configuration in which a ring member for holding the outer edge of the upper surface of the lid is provided and a manual diameter expansion holding mechanism for expanding and holding the ring member is provided.

As a result, when closing the hole of the main body with the lid, the lid is inserted into the hole at a predetermined depth position, a ring member is disposed on the lid, and the diameter expansion holding mechanism is manually operated to expand the hole. The ring member is expanded and held by the diameter holding mechanism. When the diameter of the ring member is increased, the outer peripheral portion of the ring member is inserted into the groove of the hole portion, and the inner peripheral portion presses the outer edge of the upper surface of the lid, that is, the ring member is disposed across the boundary between the groove and the lid, Hold the lid. In this state, the seal member provided on either the inner periphery of the hole or the outer periphery of the lid is elastically contacted with the other to perform sealing.
For this reason, since the lid can be manually closed and fixed, workability can be improved. In particular, in the past, the sealing of the lid is based on the surface contact between the back surface of the lid and the opening end surface of the hole. Therefore, the nut cannot be sealed unless the nut is firmly tightened, and the tightening load increases. Since the diameter can be expanded with a small load, the workability can be improved by using a simple mechanism in which the diameter expansion holding mechanism is manually operated.
Further, in a state where the lid is closed, a seal member provided on one of the inner periphery of the hole and the outer periphery of the lid is elastically contacted with the other to perform sealing. In this case, even if an internal pressure is applied to the flow path of the main body, the ring member is disposed across the boundary between the groove and the lid and presses the lid, so the lid is stable without being tilted. It is possible to secure the sealing performance by preventing the fluid from leaking. In particular, when internal pressure is applied to the flow path of the main body with the lid closed, the lid floats and tries to move in the opening direction, but the ring member is pressed against the wall surface of the groove by this lid, Accordingly, the presser foot is surely secured, so that the lid is securely fixed and the sealing property is secured.

On the other hand, when removing the lid from the hole of the main body, the diameter expansion holding mechanism is manually operated to cancel the diameter expansion holding of the ring member by the diameter expansion holding mechanism. Thereby, since the ring member is formed of the spring material, the diameter is reduced, and the outer peripheral portion of the ring member comes out of the groove of the hole portion. As a result, the lid is not pressed by the ring member, and the lid can be easily removed. For this reason, since the lid can be manually released and opened, workability can be improved.
That is, both the opening and closing of the lid and the attachment and detachment of the screen can be performed manually, so that the detachability of the screen can be further improved.

  According to the present invention, when the screen is attached to the main body, the screen is inserted into the flow path from the hole with the lid of the main body removed, and the opening end of the screen is inserted into the end holding portion of the main body. At the same time, the retaining means is manually attached. On the other hand, when the screen is taken out, with the lid of the main body removed, the retaining means is manually removed, the opening end of the screen is removed from the end holding portion of the main body, and the screen is taken out. For this reason, since the screen can be easily attached and detached by a simple manual operation of the retaining means, workability can be improved.

  Further, when the lid is closed, the screen is prevented from being removed by the retaining means, so that the opening end portion of the screen is held in the end holding portion of the main body. For this reason, the seal ring provided on the outer periphery of the opening end of the screen is elastically contacted with the inner peripheral surface of the end holding portion, and this state is maintained. It is possible to prevent foreign matter from passing through between the outer periphery of the opening end and the inner periphery of the end holding part, resulting in poor filtration, and to reliably capture foreign matter such as dust on the screen. become able to. In other words, even if a fine mesh is used for the screen net, foreign matter such as dust that is coarser than this mesh does not escape from between the opening end portion of the screen and the end holding portion. It becomes possible to respond.

It is a disassembled perspective view which shows the strainer which concerns on embodiment of this invention. It is a top view which shows the strainer which concerns on embodiment of this invention. It is a side half sectional view showing the strainer concerning an embodiment of the invention. It is front sectional drawing which shows the strainer which concerns on embodiment of this invention in the state which closed the lid | cover. In the strainer which concerns on embodiment of this invention, it is a figure which shows the process of mounting | wearing a main body with a screen and a presser foot. In the strainer which concerns on embodiment of this invention, it is principal part sectional drawing which shows the state before mounting | wearing a main body with a lid | cover. In the strainer which concerns on embodiment of this invention, it is process drawing which shows the process of mounting | wearing a lid | cover with a main body, (a) is the initial figure which puts a lid | cover, (b) is the state which inserted the lid | cover in the predetermined position. The figure which shows the state which has a ring presser in a cancellation | release position, (c) is a figure which shows the state which has a ring presser in a press position in the state which inserted the cover in the predetermined position. In the strainer which concerns on embodiment of this invention, it is a figure which shows the diameter expansion state of a ring member when a ring presser exists in a press position and a release position. In the strainer which concerns on embodiment of this invention, it is principal part sectional drawing which shows a state when a ring presser exists in a press position. It is a disassembled perspective view which shows the strainer which concerns on another embodiment of this invention. It is a top view which shows the strainer which concerns on another embodiment of this invention. It is front sectional drawing which shows the strainer which concerns on another embodiment of this invention. In the strainer which concerns on another embodiment of this invention, it is principal part sectional drawing which shows a diameter expansion holding mechanism. It is a strainer which concerns on embodiment of this invention, Comprising: The strainer provided with another example of the position recognition mechanism is shown, (a) is a top view, (b) is a principal part side surface sectional drawing. 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 9 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 4 having an inlet 2 and an outlet 3, a lid 11 that opens and closes a hole 10 formed in the main body 1, and a flow path 4 of the main body 1. And a cup-shaped screen 50 having an inflow opening 51 through which a fluid flows.

  As shown in FIGS. 1 to 4, the main body 1 is a tubular body having a straight channel 4 and is formed of a casting. At the inner edges of the inlet 2 and the outlet 3 of the main body 1, flanges 5 for attaching the main body 1 to other pipes through which fluid flows are formed. In addition, an end holding portion 6 into which the opening end of the screen 50 is inserted when the screen 50 is mounted is formed inside the inner wall forming the flow path 4 on the inlet 2 side of the main body 1. The end holding part 6 has a step surface 6 a with which the end face can come into contact when the inflow opening 51 of the screen 50 is inserted.

Further, as shown in FIG. 4, guide protrusions 7 that support and guide the screen 50 so that the axis of the main body 1 and the axis of the screen 50 at the time of insertion are coaxial on the inner wall forming the flow path 4. Is provided. The contact surface of the guide projection 7 that contacts the screen 50 is formed on a circumferential surface along the outside of the screen 50.
Furthermore, a hole 10 for inserting and removing the screen 50 is provided in the side wall of the main body 1. The hole 10 is formed in a circular cylindrical shape.

The hole 10 is provided with a lid 11 for opening and closing it. The lid 11 is formed of a casting similar to that of the main body 1 and is formed in a disc shape having a central axis P. The lid 11 is formed so as to be inserted into a predetermined depth position of the hole 10. A step portion 12 is formed on the inner periphery of the hole portion 10 so that the outer peripheral edge portion of the lower surface of the lid 11 abuts, and the lid 11 is in a predetermined depth position of the hole portion 10 in contact with the step portion 12. Is positioned. A tapered step portion 13 (FIG. 6) is also formed on the way to the step portion 12 so that the lid 11 is gradually fitted into the hole portion 10.
Further, a seal member 14 that elastically contacts the other is provided on either the inner periphery of the hole 10 or the outer periphery of the lid 11. In the embodiment, the seal member 14 is formed of a rubber O-ring and is attached to the groove portion 15 formed on the outer periphery of the lid 11.

  Further, a groove 16 is formed on the inner periphery of the hole portion 10 along the outer periphery of the upper surface of the inserted lid 11. Further, on the lid 11, a ring member 20 that is formed of a spring material, is expanded in diameter, the outer peripheral portion is inserted into the groove 16, and the inner peripheral portion presses the outer edge of the upper surface of the lid 11 is disposed. The ring member 20 has a circular cross section, and is formed in a C shape having a notch portion 21 in which a part of an annular spring material is notched. The protruding portion 22 is integrally formed. On the wall portion that forms the periphery of the hole portion 10, there is an upper open recess 23 at an equiangular (180 °) position that the protrusion 22 protrudes outward when the ring member 20 is attached to the groove 16. A pair is formed in relation.

Further, an eyebolt 26 for locking the hook of the winch is mounted on the end face of the wall portion constituting the hole portion 10 so as to suspend and move the main body 1 with a winch or the like, at an equiangular (180 °) positional relationship. And there is one confrontation.
Furthermore, the lid 11 is provided with a ball valve 27 that is opened and closed by manual operation of the cock 27a for releasing the pressure inside the main body 1.
Reference numeral 28 denotes a plug for pressure release or liquid release provided in the main body 1.

And this strainer S is provided with the manual diameter expansion holding mechanism 30 which expands and hold | maintains said ring member 20 in diameter.
The diameter expansion holding mechanism 30 is provided on the upper side of the lid 11 so as to be movable in the vertical direction, and can be positioned at a pressing position X that presses the ring member 20 in the diameter expanding direction by movement and a release position Y that releases the pressing of the ring member 20. The ring presser 31 is provided. The diameter expansion holding mechanism 30 manually moves the ring presser 31 from the release position Y to the pressing position X and holds it at the pressing position X.
Specifically, the ring retainer 31 is an annular ring body 32 having an outer diameter substantially the same as the outer shape of the lid 11, and is mounted on the ring body 32. And a construction member 33 to be configured. The lower outer peripheral edge of the ring retainer 31 of the ring presser 31 is in contact with the inner surface of the ring member 20 and is formed on an inclined surface that presses the ring member 20 in the diameter increasing direction when moving in the pressing position X direction. A portion 34 is provided. A through hole 35 is formed in the center of the erection member 33 of the ring presser 31.
On the other hand, the outer edge 36 of the upper surface of the lid 11 is formed on an inclined surface that abuts the inner side of the ring member 20 and presses the ring member 20 in the diameter increasing direction when the lid 11 moves in the opening direction.

The diameter-enlargement holding mechanism 30 includes a spring 37 that biases the ring presser 31 in the release position Y direction, and moves the ring presser 31 against the biasing force of the spring 37 to the press position X. The one ring presser 31 to be positioned is configured to be movable to the release position Y by the urging force of the spring 37.
The diameter-enlargement holding mechanism 30 is a stud that is erected on the upper surface of the center of the lid 11 and through which a through-hole 35 formed in the center of the erection member 33 of the ring presser 31 is inserted, so The bolt 40 is screwed to the stud bolt 40 so as to be able to advance and retreat on the upper side of the ring presser 31 and is manually moved to press the ring presser 31 at the time of advancement so that the ring presser 31 can be moved to the release position Y when retreating. The advancing / retracting member 41 is provided. The advancing / retracting member 41 is formed in a rod-like handle type that can be operated by hand. The spring 37 is a coil spring that is inserted between the stud bolt 40 and provided between the lid 11 and the ring presser 31.

  A wing nut 42 that locks the advance / retreat member 41 is screwed onto the upper side of the advance / retreat member 41 of the stud bolt 40 in a state where the advance / retreat member 41 positions the ring presser 31 at the pressing position X. Further, on the upper side of the wing nut 42, the advancing / retreating member 41 is located between the lower surface of the ring body 32 of the ring retainer 31 and the upper surface of the lid 11 at a position where the ring retainer 31 is located at the release position Y (FIG. 6). Is held at a predetermined interval of, for example, 4 mm, and a pair of positioning nuts 43 for allowing the diameter reduction of the ring member 20 are screwed together.

  Further, the strainer is provided with a position recognition mechanism 70 for recognizing that the ring presser 31 is located at the pressing position X. Specifically, a pair of female screws 24 having an axis in a direction perpendicular to the vertical axis of the lid 11 are formed on the wall that forms the periphery of the hole 10 with an equiangular (180 °) positional relationship. Has been. Each female screw 24 is screwed into the female screw 24 and screwed into the female screw 24 from the outside, and the male screw 25a facing the upper side of the ring presser 31 (FIGS. 4 and 6C) at the pressing position X. A butterfly bolt 25 is provided. The position recognition mechanism 70 includes the female screws 24 and the butterfly bolts 25 that are screwed to the female screws 24.

  Then, as shown in FIG. 6, the ring member 20 and the enlarged diameter holding mechanism 30 are attached to the lid 11 in advance. That is, the stud bolt 40 is erected on the lid 11, the ring member 20 is placed on the lid 11, the spring 37 is inserted into the stud bolt 40, and then the ring retainer 31 is inserted into the stud bolt 40 through the through hole 35. It is penetrated and placed on the lid 11. Thereafter, the advance / retreat member 41, the wing nut 42 and the positioning nut 43 are screwed onto the stud bolt 40. In this case, the ring member 20 is reduced in diameter by separating the lower surface of the ring retainer 31 from the upper surface of the lid 11 by a predetermined distance.

As shown in FIGS. 1, 4 and 5, the screen 50 is formed in a cup shape provided in the flow path 4 of the main body 1 and having an inflow opening 51 and a bottom 51a. The screen 50 is formed in a cylindrical cup shape and includes a net-like member 52 made of metal such as stainless steel. A ring-shaped front frame 53 and a rear frame 54 made of metal such as stainless steel are fixed to both ends of the mesh member 52 by welding. The front frame 53 constitutes an opening end 55 having an inflow opening 51 of the screen 50, while the rear frame 54 constitutes a pressing member 65 described later. The mesh member 52 includes an outer member (not shown) formed of a metal punch plate having a large number of small holes, and an inner member (not shown) attached to the inside of the outer member by welding and formed of a metal net. Z)). The metal net constituting the inner member is composed of, for example, 20 mesh to 200 mesh. For example, 100 mesh (having 1 × 10 ⁴ eyes per square inch) is used. Since the net-like member 52 has a two-layer structure of a metal punch plate and a metal net, the strength is increased.

  A seal ring 56 that elastically contacts the inner peripheral surface of the end holding portion 6 of the main body 1 is provided on the outer periphery of the opening end portion 55 formed of the front frame 53. In the embodiment, the seal ring 56 is composed of a rubber O-ring and is attached to a groove portion 57 formed on the outer periphery of the front frame 53. A handle 58 is provided on the screen 50.

Further, the main body 1 is provided with a retaining means 60 for preventing the opening end portion 55 of the screen 50 from coming off from the end holding portion 6.
The retaining means 60 is an inner wall forming the flow path 4 of the main body 1, and is provided with an insertion hole 61 provided on the outlet 3 side of the bottom 51 a of the screen 50, and one end is inserted through the insertion hole 61. A presser bar 62 that presses the bottom 51a is provided. The insertion hole 61 is an inner wall that forms the flow path 4 of the main body 1 and is provided in a portion facing the lid 11 attached to the main body 1. The other end of the presser foot 62 is formed to be able to be locked to the attached lid 11. Specifically, the other end 62a of the presser foot 62 is formed in a planar shape that can be pressed against the lower surface of the attached lid 11.

  Further, the retaining means 60 is provided in a pair of upper and lower sides coaxially with the presser foot 62 and is widened toward the other end side of the presser foot 62, and the truncated cone portion 63 is provided at the bottom 51 a of the screen 50. , 64 abutting against the conical surfaces 63a, 64a, and a pressing member 65 that presses the other end of the presser foot 62 toward the lower surface of the lid 11 by moving the screen 50 toward the outlet 3 side. The pressing member 65 is composed of a frame 54 fixed to the outer periphery of the bottom 51 a of the mesh member 52 of the screen 50. The outer periphery of the rear frame 54 as the pressing member 65 contacts the conical surface 63a of the upper truncated cone part 63, and the inner periphery of the rear frame 54 contacts the conical surface 64a of the lower truncated cone part 64. In addition, since the insertion hole 61 penetrates the main body 1 when formed, the outer side thereof is closed by the blind plug 66.

  Therefore, in the strainer S according to this embodiment, when the screen 50 is attached to the main body 1, as shown in FIG. 5, first, the lid 11 of the main body 1 is removed to open the hole 10, and the screen 50 The handle 58 is gripped and the screen 50 is put into the hole 10 from the bottom 51a side and accommodated in the flow path 4 (S1 → S2 in FIG. 5). In the flow path 4, the screen 50 is placed on the guide protrusion 7, and the inflow opening 51 of the screen 50 is opposed to the end holding portion 6 of the main body 1 (S 2 in FIG. 5). Then, the opening end portion 55 of the screen 50 is inserted into the end holding portion 6 (S3 in FIG. 5). Next, the presser foot 62 is inserted into the main body 1 and one end of the presser foot 62 is inserted into the through hole 35 and supported (S4 → S5 in FIG. 5). In this case, the presser bar 62 can be manually attached, and since it is sufficient to perform a simple operation of simply inserting it into the insertion hole 61, it is extremely simple compared to the conventional case, and the workability can be improved.

  In this state, the hole 10 of the main body 1 is closed with the lid 11. In this case, first, as shown in FIGS. 6 and 7A, the lid 11 with the ring member 20 and the diameter expansion holding mechanism 30 is put into the hole 10. Next, as shown in FIG. 7B, the lid 11 is pushed into the hole 10 and the lid 11 is inserted into a predetermined depth position. Then, as shown in FIG. 7C, the diameter expansion holding mechanism 30 is manually operated. At this time, the advance / retreat member 41 is screwed into the stud bolt 40. Since the advancing / retracting member 41 is a handle type, the operability is good. In this operation, the sealing of the conventional lid is based on the surface contact between the back surface of the lid and the opening end surface of the hole. Therefore, the nut cannot be sealed unless the nut is firmly tightened, and the tightening load increases. Since the diameter can be increased with a relatively small load, a simple operation of manually rotating the advancing and retracting member 41 screwed to the stud bolt 40 is sufficient, and a simple mechanism can be used to improve workability. Thereby, as shown in FIG. 8, the ring presser 31 is moved to the pressing position X, and the ring member 20 is expanded and held.

  In this state, as shown in FIG. 4 and FIG. 7C, the position recognition mechanism 70 recognizes that the ring presser 31 is located at the pressing position X and performs confirmation. Specifically, the butterfly bolt 25 is screwed. In this case, if the male screw 25a of the butterfly bolt 25 is not screwed in and comes into contact with the side surface of the ring presser 31, it can be recognized that the ring presser 31 is not located at the pressing position X. In that case, the advancing / retracting member 41 is further screwed into the stud bolt 40 so that the ring presser 31 is positioned at the pressing position X. Further, if the male screw 25a of the butterfly bolt 25 is screwed and faces the upper side of the ring presser 31, it can be recognized that the ring presser 31 is located at the pressing position X. Therefore, since the ring member 20 can be reliably inserted into the groove 16, it is possible to prevent a malfunction in which the ring member 20 does not enter the groove 16.

Further, when the ring presser 31 is located at the pressing position X, the wing nut 42 is screwed to lock the advance / retreat member 41. As shown in FIG. 9, when the diameter of the ring member 20 is increased, the outer peripheral portion of the ring member 20 is inserted into the groove 16 of the hole 10 and the inner peripheral portion presses the upper surface outer edge portion 36 of the lid 11, that is, the ring member. 20 is disposed across the boundary between the groove 16 and the lid 11 and presses the lid 11. In this case, since the abutting portion 34 of the ring presser 31 is formed on the inclined surface, the component force by which the ring presser 31 presses the ring member 20 in the diameter increasing direction is increased, and the diameter of the ring member 20 is easily increased accordingly. The diameter expansion can be maintained.
In this way, the lid 11 can be manually closed and fixed, so that workability can be improved. In this state, the sealing member 14 provided on the outer periphery of the lid 11 is elastically contacted with the inner periphery of the hole 10 to perform sealing. The presser foot 62 is pressed against the lower surface of the lid 11 to which the other end is attached.

  When the strainer S is used, when a fluid flows in from the inflow port 2, foreign matter mixed in the fluid is filtered by the screen 50 and flows out from the outflow port 3. In this case, since the bottom 51a of the screen 50 is pressed by the presser bar 62, the movement of the screen 50 is prevented. Therefore, an opening end 55 formed of the front frame 53 of the screen 50 is provided with a seal ring 56, and this seal ring 56 is in elastic contact with the inner peripheral surface of the end holding portion 6 of the main body 1. Prevents foreign matter such as dust contained in the fluid from passing between the outer peripheral surface of the opening end portion 55 and the inner peripheral surface of the end holding portion 6 of the main body 1 without being filtered by the mesh member 52. Is done. That is, the sealing performance by the seal ring 56 can be ensured, and the situation where dust or the like passes through between the outer periphery of the opening end 55 of the screen 50 and the inner periphery of the end holding portion 6 is prevented. Therefore, it is possible to surely capture on the screen 50. As a result, even if a fine mesh is used for the net of the screen 50, foreign matter such as dust that is coarser than the mesh does not escape from between the opening end 55 and the end holding portion 6 of the screen 50. It becomes possible to deal with a fine screen 50.

  Further, since one end of the presser bar 62 is held in the insertion hole 61 and the other end is locked and held by the lid 11, the presser bar 62 is stably held, and the screen 50 can be pressed reliably. In this case, even if the screen 50 is pushed to the outlet 3 side by the fluid, the pressing member 65 (rear frame 54) of the screen 50 gradually pushes up the conical surfaces 63a and 64a of the truncated cone parts 63 and 64 of the presser bar 62. Further, the presser foot 62 is pressed by the lid 11, and the movement of the screen 50 is surely prevented.

Further, since the lid 11 is in a closed state when the fluid is flowing, the seal member 14 provided on the outer periphery of the lid 11 is elastically contacted with the inner periphery of the hole portion 10 to perform sealing. In this case, even if an internal pressure is applied to the flow path 4 of the main body 1, the ring member 20 is disposed across the boundary between the groove 16 and the lid 11 and presses the lid 11, so that the lid 11 does not tilt. Since it is stable, the sealing performance by the sealing member 14 can be secured, and fluid leakage can be prevented. In particular, when the lid 11 is closed, the lid 11 is lifted by the internal pressure of the flow path 4 of the main body 1 and tries to move in the opening direction. The ring member 20 is pressed against the wall surface of the groove 16 by the lid 11. Therefore, since the presser foot is surely secured, the lid 11 is securely fixed and the sealing performance is ensured.
As shown in FIG. 9, when the lid 11 is lifted and moved in the opening direction due to internal pressure applied to the flow path 4 of the main body 1 with the lid 11 closed, the lid 11 tends to come off. However, since the upper surface outer edge portion 36 of the lid 11 is formed on an inclined surface, the inclined surface increases the component force for pressing the ring member 20 in the diameter-expanding direction, and the presser foot is thus surely secured. The lid 11 is more securely fixed and the sealing performance is ensured.

In addition, when dust accumulates on the mesh member 52 of the screen 50 due to the use of the strainer S, the screen 50 is cleaned, or the mesh member 52 is often damaged or broken. Replaces the mesh member 52. In this case, the lid 11 is removed from the hole 10 of the main body 1 and the screen 50 is taken out.
At this time, the lid 11 is removed in a state where there is no internal pressure in the flow path 4 of the main body 1 and the reverse process is performed (FIG. 7 (c) → FIG. 7 (b) → FIG. 7 ( a) → FIG. 6). That is, the wing bolt 25 is loosened, the wing nut 42 of the diameter expansion holding mechanism 30 is loosened to unlock the advance / retreat member 41, and then the advance / retreat member 41 is loosened to expand the ring member 20 by the diameter expansion holding mechanism 30. Release the diameter retention. Thereby, since the ring member 20 is formed of the spring material, the diameter is reduced, and the outer peripheral portion of the ring member 20 comes out of the groove 16 of the hole portion 10. At this time, as shown in FIG. 7B, the ring presser 31 is forcibly moved in the release position Y direction by the biasing force of the spring 37 of the diameter expansion holding mechanism 30, so that the diameter expansion of the ring member 20 is released. Thus, the outer peripheral portion of the ring member 20 is surely detached from the groove 16 of the hole portion 10.

In this case, if the ring member 20 is not sufficiently reduced in diameter and the outer peripheral portion of the ring member 20 is difficult to be removed from the groove 16 of the hole 10, as shown in FIG. The outward projecting portions 22 at both end portions of the portion are manually moved so as to be close to each other. As a result, the ring member 20 is forcibly reduced in diameter, so that the outer peripheral portion of the ring member 20 is The lid 16 can be reliably removed from the groove 16, and the lid 11 can be easily removed.
As shown in FIG. 6, the lid 11 with the ring member 20 and the enlarged diameter holding mechanism 30 is pulled out from the hole 10 and removed. In this case, since the cover 11 is not pressed by the ring member 20, the cover 11 can be easily removed. For this reason, since the lid 11 can be manually unlocked and opened, workability can be improved.

  Then, the screen 50 is taken out. Also in this case, a process opposite to the process shown in FIG. 5 is performed. That is, the presser foot 62 is manually pulled out from the insertion hole 61 and the screen 50 is taken out. At this time, since the presser foot 62 and the screen 50 can be manually removed, the work is performed very easily as compared with the conventional case, and the workability can be improved. Next, in the same manner as described above, the screen 50 is inserted into the flow path 4 from the hole 10, and the opening end portion 55 of the screen 50 is inserted into the end holding portion 6 of the main body 1. Next, the presser foot 62 is manually attached, and the lid 11 is closed again in the same manner as described above. Also in this case, since the presser foot 62 can be manually mounted, the mounting of the screen 50 in a state where the lid 11 is opened is performed extremely easily as compared with the conventional case, and the workability can be improved. That is, both the opening and closing of the lid 11 and the attachment / detachment of the screen 50 can be performed manually, so that the attaching / detaching workability of the screen 50 can be further improved.

By the way, in general, in the strainer S, the lid 11 is normally opened in a state where there is no internal pressure in the flow path 4 of the main body 1. In some cases, the lid 11 may be mistakenly attempted to open. However, in the embodiment, even when the internal pressure is applied to the flow path 4 of the main body 1 in this way and the lid 11 is accidentally opened to manually open the diameter expansion holding mechanism 30, the lid is caused by the internal pressure. Since 11 is pushed outward, the ring member 20 is pressed against the groove 16, so that even if the ring member 20 attempts to reduce the diameter, this is prevented. Therefore, the situation where the lid 11 jumps outward due to the internal pressure is prevented, and safety can be ensured. In other words, the strainer S has a structure in which the lid 11 can be opened only after the internal pressure is removed. Therefore, when the lid 11 is opened while the lid 11 can be easily opened manually. It is also possible to ensure safety.
In particular, since the outer edge 36 of the upper surface of the lid 11 is formed on an inclined surface, the inclined surface increases the component force for pressing the ring member 20 in the diameter increasing direction. The lid 11 is more reliably fixed, and the situation in which the lid 11 jumps outward due to the internal pressure can be reliably prevented to improve safety.

  10 to 13 show a strainer S according to another embodiment of the present invention. This is different from the strainer S described above, in the enlarged diameter holding mechanism 30, a plurality of stud bolts 40 are provided, and through holes 35 corresponding to the stud bolts 40 are formed in the ring presser 31. A spring 37 is provided. Four through-holes 35 are provided in the annular body 32 of the ring presser 31 with an equiangular (90 °) positional relationship. As shown in FIG. 13, the through-hole 35 includes an upper small-diameter portion 35a and a lower large-diameter portion 35b. The spring 37 is accommodated in the large-diameter portion 35b, and the large-diameter portion 35b and the small-diameter portion 35a Both ends of the step and the upper surface of the lid 11 are pressed. Four stud bolts 40 are erected on the outer peripheral portion of the lid 11 corresponding to the through hole 35. Unlike the above, the advancing / retracting member 41 is constituted by a wing nut, and no wing nut and nut for locking are provided. Instead, a spring washer 45 inserted into the stud bolt 40 is provided. The strainer S according to another embodiment also has the same operations and effects as described above.

  In FIG. 14, the strainer S provided with another example of the position recognition mechanism 70 is shown. This is a strainer of the type provided with the stud bolt 40 described above. Unlike the above, the position recognizing mechanism 70 forms a through hole 71 perpendicular to the axis of the stud bolt 40 at a predetermined position of the stud bolt 40, and is inserted into the through hole 71 to position the ring presser 31 at the pressing position X. Further, a pin 72 facing the upper side of the advance / retreat member 41 is provided. The pin 72 is formed of a so-called snap ring having a presser portion 72 a bent in a substantially U shape that holds the stud bolt 40 when inserted into the through hole 71. Note that reference numeral 75 in FIG. 14 is a manual open / close valve for releasing the pressure inside the main body 1 and replaces the ball valve 27 described above. In this example, the wing nut 42 for locking the advance / retreat member 41 is not provided.

  According to this, the advancing / retreating member 41 is advanced to position the ring presser 31 at the pressing position X, and then the pin 72 is inserted into the through hole 71. In this case, when the pin 72 is not inserted into the through hole 71 and hits the stud bolt 40, it can be recognized that the ring presser 31 is not located at the pressing position X. Further, if the pin 72 is inserted into the through-hole 72 and faces the upper side of the advance / retreat member 41, it can be recognized that the ring presser 31 is located at the pressing position X. Therefore, since the ring member 20 can be reliably inserted into the groove 16, it is possible to prevent a malfunction in which the ring member 20 does not enter the groove 16.

In the above embodiment, the number of stud bolts 40 and the positions to be provided are not limited to those described above, and may be appropriately changed. The shape of the ring member 20 is not limited to a circular cross section, and may be appropriately changed such as a rectangular cross section. In addition, the configuration of the diameter expansion holding mechanism 30 is not limited to that described above.
Further, in the present invention, the lid is not limited to the lid according to the above-described embodiment. For example, as in the conventional case, any type such as a type fixed with bolts and nuts, a type into which the lid itself is screwed, etc. Of course, the present invention can also be applied.

DESCRIPTION OF SYMBOLS S Strainer 1 Main body 2 Inlet 3 Outlet 4 Flow path 6 End part holding part 6a Step surface 7 Guide protrusion 10 Hole part 11 Lid 12 Step part 14 Seal member 15 Groove part 16 Groove 20 Ring member 21 Notch part 22 Protrusion part 23 Recess 24 Female screw 25 Butterfly bolt 26 Eye bolt 27 Ball valve 28 Plug 30 Expanding holding mechanism 31 Ring presser X Pressing position Y Release position 32 Torus 33 Construction member 34 Abutting part 35 Through hole 36 Upper surface outer edge part 37 Spring 40 Stud bolt 41 Advancement / retraction member 42 Wing nut 43 Nut 45 Spring washer 50 Screen 51 Inflow opening 51a Bottom 52 Mesh member 53 Front frame 54 Rear frame 55 Open end (front frame 53)
56 Seal ring 57 Groove portion 60 Retaining means 61 Insertion hole 62 Presser foot 63, 64 Frustum portion 63a, 64a Conical surface 65 Press member (rear frame 54)
66 Plug 70 Position recognition mechanism 71 Through hole 72 Pin

Claims (5)

A main body having a flow path having an inlet and an outlet, a cup-shaped screen provided in the flow path of the main body and having an inflow opening and a bottom, and a screen provided on a side surface of the main body. An end holding portion having an opening for inserting the screen and an open end portion of the screen inside the inner wall forming a flow path on the inlet side of the main body. In the strainer formed by
A seal ring that elastically contacts the inner peripheral surface of the end holding portion is provided on the outer periphery of the opening end portion of the screen, and the manual operation for preventing the opening end portion of the screen from coming out of the end holding portion on the main body. A strainer, characterized in that it is provided with a retaining means that can be attached and detached.   The retaining means includes an insertion hole that is an inner wall that forms a flow path of the main body and is provided on the outlet side of the bottom of the screen, and a presser that is inserted into the insertion hole at one end to hold the bottom of the screen. The strainer according to claim 1, wherein the strainer is provided with a ridge.   The insertion hole is provided on a portion of the inner wall that forms the flow path of the main body, facing the lid attached to the main body, and the other end of the presser foot is formed to be able to be locked to the attached lid. The strainer according to claim 2, wherein   The retaining means is coaxially provided on the presser foot and extends toward the other end side of the presser foot, and is in contact with the conical surface of the truncated cone portion provided at the bottom of the screen. The strainer according to claim 3, further comprising: a pressing member that presses the other end of the presser foot toward the lower surface of the lid by movement of the presser foot toward the outlet side.   The strainer according to claim 4, wherein the pressing member is constituted by a ring-shaped frame fixed on the outer periphery of the bottom portion.

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