Fluid strainer, straining cylinder, and method for removing foreign matters of fluid strainer

Abstract

To easier remove foreign matters accumulated on a fluid strainer.SOLUTION: A fluid strainer comprises: a body container; a lid which is attached to the body container; a straining cylinder which is stored in the body container; an inflow pipe which is provided on the body container and through which a first fluid containing foreign matters flows; an outflow pipe which is provided on the body container and through which a strained fluid flows; a straining board which is arranged in a passage through which the first fluid in the straining cylinder flows so that a board surface becomes oblique to a flowing direction of the first fluid; a first opening which is provided on the body container or the lid and to which an injection pipe of a second fluid released toward a surface opposite to a side to which foreign matters in the straining board are stuck is attached; and a second opening which is provided on the body container or the lid and to which an exhaust pipe of a foreign matter fluid mixture in which foreign matters peeled off from the straining board by the second fluid are mixed is attached.SELECTED DRAWING: Figure 10B

Description

[Technical Field]

[0001] The present invention relates to a fluid strainer, a strainer tube, and a method for removing foreign matter from a fluid strainer. [Background technology]

[0002] Fluid strainers are known that separate and remove foreign matter from a fluid containing foreign matter to obtain a filtered fluid. Fluid strainers are installed, for example, in seawater piping used to cool engines on ships. In this case, the fluid strainers are used to separate and remove foreign matter such as jellyfish contained in the seawater to prevent clogging of the piping, damage to equipment, etc.

[0003] The foreign matter trapped by the fluid strainer accumulates inside the fluid strainer, and to prevent the fluid strainer from being clogged with the foreign matter, an operator periodically or as needed removes the foreign matter accumulated inside the fluid strainer.

[0004] Generally, to remove foreign matter from a fluid strainer, it is necessary to release the top lid of the fluid strainer from its closed state, open the top lid, pull up the strainer tube inside the main container, remove the foreign matter from the strainer tube, return the strainer tube to its original position, and close the top lid to return it to its closed state. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-158494 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the above work is very complicated and requires a lot of physical effort, and places a great physical burden on the workers.

[0007] In view of the above circumstances, there is a demand for a technique that can more easily remove foreign matter accumulated in a fluid strainer.

[0008] Patent Document 1 describes a fluid strainer in which a fluid is agitated by gas injected into the inside of a strainer tube, and the fluid mixed with foreign matter is discharged to the outside of the strainer tube. However, this fluid strainer is different from the present invention. [Means for solving the problem]

[0009] A representative embodiment of the present invention is a fluid strainer comprising: a main container; a lid attached to the main container; a strainer tube housed in the main container; an inlet pipe attached to the main container through which a first fluid containing foreign matter flows; an outlet pipe attached to the main container through which the filtered fluid flows; a strainer plate arranged in a path through which the first fluid flows inside the strainer tube so that the plate surface is oblique to the direction of flow of the first fluid; a first opening attached to the main container or the lid and to which an injection pipe for a second fluid is attached which is discharged toward the surface of the strainer plate opposite to the side on which the foreign matter adheres; and a second opening attached to the main container or the lid and to which an outlet pipe for a foreign matter-mixed fluid containing foreign matter peeled off from the strainer plate by the second fluid is attached. [Effects of the Invention]

[0010] According to a representative embodiment of the present invention, foreign matter accumulated in a fluid strainer can be removed more easily. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of seawater piping equipment in a ship. [Figure 2] FIG. 1 is a diagram showing foreign matter accumulating in a fluid strainer installed in a seawater piping facility. [Figure 3] FIG. 1 is a perspective view showing a typical fluid strainer. [Figure 4] 1 is a three-view diagram of a typical fluid strainer. [Figure 5] FIG. 1 is a diagram showing the internal configuration of a typical fluid strainer. [Figure 6] FIG. 1 is a flow chart showing an example of the flow of a general foreign matter removal method. [Figure 7] 1 is a diagram showing an example of the configuration of a fluid strainer according to a first embodiment. FIG. [Figure 8] 1 is a diagram showing an example of an installation mode of a fluid strainer according to a first embodiment. FIG. [Figure 9] 1 is a flowchart showing an example of the flow of a foreign matter removal method according to the first embodiment. [Figure 10A] FIG. 10 is a diagram showing foreign matter accumulated on a filter plate in a filter tube. [Figure 10B] FIG. 10 is a diagram showing how accumulated foreign matter is peeled off by injecting miscellaneous water. [Figure 10C] FIG. 10 is a diagram showing the movement of detached foreign matter within a fluid strainer. [Figure 10D] FIG. 10 is a diagram showing foreign matter and fluid being discharged from the fluid strainer. [Figure 11] 10 is a diagram showing an installation mode of a fluid strainer according to a first modified example of the first embodiment. FIG. [Figure 12] 10 is a flow chart showing an example of the flow of a method for removing foreign matter from a fluid strainer according to a first modification of the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Fluid strainers are installed in piping systems that draw seawater from the ocean and send it to cooling systems to be used to cool heat-generating equipment in ships, power plants, factories, etc. Fluid strainers are used to separate and remove foreign matter contained in seawater, such as fish, shellfish, seaweed, and jellyfish.

[0013] Here, we will first explain the seawater piping equipment of a ship as an example of an embodiment in which a fluid strainer is installed, and then explain an example of a conventional fluid strainer and foreign matter removal method, and then explain each embodiment of the present invention.

[0014] <Example of seawater piping equipment on a ship> An example of a seawater piping system of a ship in which a fluid strainer is installed will be described.

[0015] 1 is a diagram showing an example of the configuration of seawater piping equipment on a ship. The seawater piping equipment 1 is piping equipment for cooling the main engine, generator engine, etc. mounted on the ship with seawater.

[0016] As shown in FIG. 1, the seawater piping system 1 has, for example, a seawater intake port 10, a water intake and filtering system 20, a cooling system 30, and a seawater discharge port 40.

[0017] The seawater intake port 10 and the water intake and filtering system 20 are connected by a pipe 15. The water intake and filtering system 20 and the cooling system 30 are connected by a pipe 25. The cooling system 30 and the seawater discharge port 40 are connected by a pipe 35.

[0018] The seawater inlet 10 is an opening for drawing in seawater 80 from the ocean, and is formed in the bottom or side of the ship. The water intake and filtering system 20 draws up the seawater 80 from the seawater inlet 10 through piping 15, separates and removes foreign matter 81 from the seawater 80, and sends it to the cooling system 30 through piping 25.

[0019] The cooling system 30 cools the engine and other components using the delivered seawater 80. The seawater 80 used for cooling is sent out to a seawater outlet 40 through piping 35. The seawater outlet 40 is an opening for discharging the seawater 80 delivered from the cooling system 30. The seawater outlet 40 is formed in the bottom or side of the ship.

[0020] The water absorption / filtration system 20 has a first water absorption / filtration system 21 and a second water absorption / filtration system 22 connected in parallel.

[0021] The first water intake and filtration system 21 has a first inlet valve 211, a first fluid strainer 212, a first seawater pump 213, and a first outlet valve 214. The first inlet valve 211, the first fluid strainer 212, the first seawater pump 213, and the first outlet valve 214 are connected in series in this order from the piping 15.

[0022] Similarly, the second water intake and filtration system 22 has a second inlet valve 221, a second fluid strainer 222, a second seawater pump 223, and a second outlet valve 224. The second inlet valve 221, the second fluid strainer 222, the second seawater pump 223, and the second outlet valve 224 are connected in series in this order from the piping 15.

[0023] The seawater intake and filtering system 20 is operated, for example, as follows: The second inlet valve 221 and the second outlet valve 224 are closed, and the second seawater pump 223 is stopped. Meanwhile, the first inlet valve 211 and the first outlet valve 214 are open, and the first seawater pump 213 is operating. Due to the operation of the first seawater pump 213, seawater 80 is sucked up from the seawater intake port 10. The sucked up seawater 80 is filtered by the first fluid strainer 212, passes through the first seawater pump 213, and is sent to the cooling system 30.

[0024] Fig. 2 is a diagram showing how foreign matter accumulates in a fluid strainer installed in seawater piping equipment. As shown in Fig. 2, seawater inlet 10 is provided in vessel portion 12, which is the bottom or side of vessel 11. Seawater 80 containing foreign matter 81 is sucked up through seawater inlet 10 by the suction force of first seawater pump 213, passes through first inlet valve 211, and flows into first fluid strainer 212. In first fluid strainer 212, foreign matter 81, such as fish, shellfish, and jellyfish, is separated and removed from seawater 80. Removing foreign matter 81 from seawater 80 in this manner prevents blockage of piping and damage to equipment, including pumps.

[0025] As the first fluid strainer 212 continues to separate and remove foreign matter 81, foreign matter 81 gradually accumulates in the first fluid strainer 212, as shown in Fig. 2. When foreign matter 81 accumulates in the first fluid strainer 212, the flow of seawater 80 is obstructed by the foreign matter 81, reducing the flow rate of the seawater 80 and reducing the cooling effect of the seawater 80. For this reason, generally, when a certain amount of foreign matter 81 has accumulated, or after a certain amount of time has passed, an operation to remove the accumulated foreign matter 81 from the first fluid strainer 212 (hereinafter also referred to as a foreign matter removal operation) is performed.

[0026] However, in order to continue operating the ship at sea, it is necessary to continue cooling the heat-generating equipment even while the foreign object removal work is being performed. Therefore, when the foreign object removal work is being performed, the water intake and filtering system to be used is switched from the first water intake and filtering system 21 to the other, the second water intake and filtering system 22.

[0027] In the second water intake filtration system 22, when a certain amount of foreign matter 81 has accumulated in the second fluid strainer 222, the water intake filtration system in use is switched from the second water intake filtration system 22 to the first water intake filtration system 21. Then, work is performed to remove the foreign matter from the second fluid strainer 222. Note that if the first inlet valve 211, the first outlet valve 214, the second inlet valve 221, and the second outlet valve 224 are check valves, these four valves are always used in an open state.

[0028] While the ship is in operation, this switching of the water intake and filtering system and the work of removing foreign matter from the fluid strainer are repeated multiple times.

[0029] <Example of a conventional general fluid strainer> Next, an example of a conventional general fluid strainer will be described.

[0030] FIG. 3 is a perspective view of a typical fluid strainer. FIG. 4 is a three-view diagram of a typical fluid strainer. In FIG. 4, the lower left figure is a front view of fluid strainer 5, the upper left figure is a plan view of fluid strainer 5, and the lower right figure is a side view of fluid strainer 5. FIG. 5 is a diagram showing the internal configuration of a typical fluid strainer. In FIG. 5, the right figure is a side perspective view of fluid strainer 5, and the left figure is an AA cross-sectional view of the side perspective view. In the specification of this application, the direction in which seawater flows in the fluid strainer is defined as the x-direction, the horizontal direction perpendicular to the x-direction is defined as the y-direction, and the direction perpendicular to the x-direction and y-direction is defined as the z-direction. When the fluid strainer is installed in a typical orientation, the x-direction and y-direction are horizontal, and the z-direction is vertical.

[0031] 3, 4, and 5, a typical fluid strainer 5 has a main container 51, an inlet pipe 52, an outlet pipe 53, a drain opening 54, a strainer tube 55, a top lid 56, a top lid opening 57, and a top lid mounting mechanism 58. The fluid strainer is also called a filter or strainer, and the strainer tube is also called an element or element filter.

[0032] The main container 51 has a cylindrical tubular member extending in the z direction and a bottom member connected to the tubular member so as to close the opening at the bottom of the tubular member. The main container 51 has an inlet opening on one side in the x direction through which the fluid flows in. The main container 51 also has an outlet opening on the other side in the x direction through which the fluid flows out.

[0033] Inflow pipe 52 is connected to an inflow opening of main container 51. Furthermore, outflow pipe 53 is connected to an outflow opening of main container 51. Inflow pipe 52 and outflow pipe 53 are each molded integrally with main container 51, for example.

[0034] The drain opening 54 is connected to the side surface of the main container 51 near the bottom surface or to the bottom surface of the main container 51. The drain opening 54 is configured to connect the internal space of the main container 51 with the external space. The drain opening 54 can be opened and closed, for example, with a plug (bolt) or the like. Furthermore, the drain opening 54 is, for example, molded integrally with the main container 51.

[0035] The strainer tube 55 has a roughly basket shape. The strainer tube 55 is configured so that it can be housed inside the main container 51. The strainer tube 55 is mainly composed of a cylindrical tube portion and a disk-shaped bottom portion connected to the tube portion. The tube portion has a plurality of through-holes that penetrate the strainer tube 55 in an inward and outward direction. Alternatively, the tube portion has a mesh structure. The strainer tube 55 has an opening in a region of the tube portion that corresponds to the opening of the inlet pipe 52.

[0036] The top lid 56 is configured to be able to close the upper opening of the cylindrical member that constitutes the main container 51. The top lid 56 is formed with a top lid opening 57. The top lid opening 57 is configured so that a discharge valve can be connected via piping or directly. The discharge valve is used, for example, to discharge gas, such as air, that has entered the main container 51 by opening or closing the top lid 56 to the outside. An annular ring may be attached to the top surface of the top lid 56. The top lid 56 can be opened, for example, by attaching a hook of a lifting tool to this ring and lifting it up.

[0037] The top lid attachment mechanism 58 is a mechanism for attaching the top lid 56 to the main container 51. For example, a protrusion that protrudes horizontally and radially is formed at the upper opening of the main container 51. The top lid 56 is formed with a flange that corresponds to the protrusion and overlaps in the vertical direction. A recess is formed in the center of the top surface of the top lid 56, into which the tip of a bolt fits.

[0038] The top lid attachment mechanism 58 is composed of a hook portion and an attachment bolt. The hook portion is composed of a first member extending horizontally, a pair of second members connected to both ends of the first member and extending vertically downward, and a pair of claw-shaped third members connected to the lower ends of the pair of second members and extending outward and inward. A screw hole is formed in the center of the first member, passing through vertically, into which the attachment bolt is fitted. The horizontal distance between the pair of second members is longer than the outer diameter of the protruding portion and the flange, and the horizontal distance between the pair of third members is shorter than the outer diameter of the protruding portion and the flange and longer than the outer diameter of the main container 51.

[0039] The worker places the top lid 56 on top of the main container 51. The hook portion is positioned so that the horizontal tip of the third member is positioned below the protruding portion. The mounting bolt is inserted into the central screw hole of the first member and screwed in until an appropriate torque is applied. Through this procedure, the tip of the mounting bolt comes into contact with the top lid and applies downward pressure, attaching the top lid 56 tightly to the main container 51.

[0040] <General method for removing foreign matter from a fluid strainer> A general method for removing foreign matter from a fluid strainer will now be described.

[0041] FIG. 6 is a flow chart showing an example of the flow of a general foreign matter removal method.

[0042] 6, in step J1, the inlet and outlet valves of the fluid strainer are closed. The worker closes the inlet and outlet valves to stop the inflow and outflow of seawater 80 into the fluid strainer 5.

[0043] In step J2, the top lid mounting mechanism of the fluid strainer is removed. Typically, the mounting bolts that attach the top lid 56 to the main vessel 51 are tightly tightened to prevent seawater 80 from leaking out of the fluid strainer 5. The mounting bolts are also relatively large. The worker uses a large wrench to loosen the mounting bolts and removes the top lid mounting mechanism 58 from the main vessel 51 and top lid 56.

[0044] In step J3, a lifting tool for lifting the top cover is prepared. Generally, the top cover 56 of a fluid strainer used in a relatively large vessel weighs from several tens of kilograms to over a hundred kilograms. Even in the case of a relatively small vessel, the top cover 56 weighs from several kilograms to several tens of kilograms. It is not easy to lift a heavy top cover 56 with bare hands, so a lifting tool for lifting the top cover 56 is used, for example. The lifting tool may be, for example, a chain block, a crane winch, or a wire hoist.

[0045] In step J4, the top cover 56 is lifted up with a lifting tool and opened. The worker attaches the hook of the lifting tool to the ring of the top cover 56 and pulls up the hook to open the top cover 56.

[0046] In step J5, the strainer tube 55 is lifted up using a lifting tool and removed from the main container. Since the strainer tube 55 is relatively heavy and deep, similar to the top cover 56, the worker lifts and removes the strainer tube 55 using the lifting tool.

[0047] In step J6, the accumulated foreign matter is removed from the strainer tube 55 and processed. In many cases, jellyfish and other highly viscous foreign matter 81 adhere to the strainer tube 55, and in order to remove the foreign matter 81, it is necessary to manually peel the foreign matter 81 off the strainer tube 55.

[0048] In step J7, the strainer tube 55 is cleaned by an operator who carefully cleans the strainer tube 55 to prevent it from clogging immediately.

[0049] In step J8, the cleaned strainer tube is stored in the main container using a lifting tool. The worker attaches the hook of the lifting tool to strainer tube 55, lifts strainer tube 55, moves it to the top of main container 51, and gradually lowers it to store it in main container 51.

[0050] In step J9, the top cover 56 is closed. The worker attaches the hook of the lifting tool to the ring of the top cover 56 and slowly lowers it to close the top cover 56.

[0051] In step J10, the worker tightens the mounting bolts on the top cover of the fluid strainer using a heavy, large wrench.

[0052] In step J11, the inlet and outlet valves of the fluid strainer are opened. The worker opens the inlet and outlet valves, and opens the inlet and outlet valves. By opening the inlet and outlet valves, the inflow and outflow of seawater 80 into the fluid strainer 5 begins.

[0053] In step J12, the air inside the fluid strainer is purged. The operator opens the handle of the discharge valve connected to the top cover opening 57 formed in the top cover 56 to open the discharge valve, and exhausts the air remaining inside the fluid strainer 5 to the outside. Once the air has been exhausted to the outside, the operator closes the handle of the discharge valve to close the discharge valve.

[0054] As described above, the task of removing foreign matter accumulated in a fluid strainer is heavy and tedious work. Furthermore, especially in the summer, when jellyfish appear in large numbers, they quickly accumulate in the fluid strainer. The task of removing foreign matter is sometimes performed more than 50 times a day. As can be seen from the above, the physical burden on workers associated with the task of removing foreign matter from a fluid strainer is extremely great. Therefore, there is a strong demand for technology that can more easily remove foreign matter accumulated in a fluid strainer.

[0055] As will be described later, the embodiment of the present invention has the effect of making it possible to more easily remove foreign matter accumulated in the fluid strainer.

[0056] In addition, in the fluid strainer described in Patent Document 1, gas is injected into the strainer tube to agitate the fluid, and the fluid mixed with foreign matter is discharged. However, generally, relatively small ships or facilities may not have equipment that can supply the gas, such as compressed air, to the strainer tube, and such fluid strainers cannot be used in many cases. In contrast, in an embodiment of the present invention, a fluid is injected into the strainer tube, the flow pressure separates the foreign matter, and the fluid mixed with the foreign matter is discharged. To inject the fluid, equipment for supplying utility water, which is often installed even in relatively small ships or facilities, can be used.

[0057] Therefore, the embodiment of the present invention has the effect of making it possible to more easily remove foreign matter accumulated in fluid strainers in a greater number of ships or facilities.

[0058] Hereinafter, each embodiment of the present invention will be described with reference to the drawings as appropriate. Note that each embodiment described below is an example for carrying out the present invention, and does not limit the technical scope of the present invention. Furthermore, in each embodiment below, components having the same function are given the same reference numerals, and repeated description thereof will be omitted unless particularly necessary.

[0059] Overview of the embodiment Each embodiment of the present invention is a fluid strainer, a strainer tube, and a method for removing foreign matter from a fluid strainer.

[0060] A fluid strainer according to one embodiment of the present invention comprises a main container, a lid attached to the main container, a strainer cylinder housed in the main container, an inlet pipe attached to the main container and through which a first fluid containing foreign matter flows, an outlet pipe attached to the main container and through which the filtered fluid flows, a strainer plate arranged in the path through which the first fluid flows inside the strainer cylinder so that the plate surface is oblique to the direction in which the first fluid flows, a first opening attached to the main container or the lid and to which an injection pipe for a second fluid is attached that is discharged toward the surface of the strainer plate opposite to the side on which the foreign matter adheres, and a second opening attached to the main container or the lid and to which an outlet pipe for a foreign matter-mixed fluid that has been mixed with foreign matter peeled off from the filter plate by the second fluid is attached.

[0061] Furthermore, a strainer tube according to one embodiment of the present invention is a strainer tube housed in the main container of a fluid strainer, and is provided with a strainer plate arranged in a path through which a first fluid containing foreign matter flows inside the strainer tube, with the plate surface being oblique to the flow direction of the first fluid.

[0062] Furthermore, one embodiment of the present invention provides a method for removing foreign matter from a fluid strainer, which includes a fluid strainer having a main container, a lid attached to the main container, a strainer cylinder housed in the main container, an inlet pipe provided in the main container through which a first fluid containing foreign matter flows, and an outlet pipe provided in the main container through which a filtered fluid flows, the method comprising: arranging a filter plate in a path through which the first fluid flows inside the strainer cylinder so that the plate surface is oblique to the direction of flow of the first fluid; discharging a second fluid from an injection pipe attached to the main container or the lid toward the surface of the filter plate opposite the side on which the foreign matter adheres; and discharging a foreign matter-mixed fluid, which is a mixture of the foreign matter peeled off from the filter plate by the second fluid, from a discharge pipe attached to the main container or the lid.

[0063] The "seawater" that flows into the strainer tube, which will be described later, is an example of the "first fluid." The "filtered seawater" that will be described later is an example of the "filtered fluid." The "top lid" that will be described later is an example of the "lid." The "miscellaneous water," "miscellaneous seawater," and "air" that will be described later are examples of the "second fluid." The "drain opening" that will be described later is an example of the "first opening." The "top lid opening" that will be described later is an example of the "second opening."

[0064] (Embodiment 1) <Configuration example of fluid strainer according to embodiment 1> An example of the configuration of the fluid strainer according to the first embodiment will be described. Fig. 7 is a diagram showing an example of the configuration of fluid strainer 6 according to embodiment 1. In Fig. 7, the central drawing is a side perspective view of fluid strainer 6, the left drawing is an AA cross-sectional view of the side perspective view of fluid strainer 6, and the right drawing is a view showing a filter plate provided in a filter cylinder of fluid strainer 6.

[0065] 7, the fluid strainer 6 has a main container 61, an inlet pipe 62, an outlet pipe 63, a drain opening 64, a strainer tube 65, a top lid 66, a top lid opening 67, and a top lid mounting mechanism 68. Each part that makes up the fluid strainer 6 is manufactured from a material such as cast iron, steel plate, or stainless steel, and some or all of the parts are subjected to corrosion prevention treatment.

[0066] 7, the main container 61 has a cylindrical tubular member 611 extending in the z direction, and a bottom member 612 connected to the tubular member 611 so as to close the opening at the bottom of the tubular member 611. The tubular member 611 has a main inlet opening 611a, which forms an opening through which seawater 80 flows in, on a curved surface on one side in the x direction. The tubular member 611 also has a main outlet opening 611b, which forms an opening through which filtered seawater 82 flows out, on a curved surface on the other side in the x direction.

[0067] The inlet pipe 62 has a generally cylindrical shape extending in a direction parallel to the x-direction. The inlet pipe 62 is connected to the main container 61 so that one opening of the inlet pipe 62 and the opening of the main container inlet opening 611a are aligned.

[0068] Outlet pipe 63 has a generally cylindrical shape extending in a direction parallel to the x-direction. Outlet pipe 63 is connected to main container 61 so that one opening of outflow pipe 63 and the opening of main container outlet 611b are aligned.

[0069] The drain opening 64 is provided in the main container 61. The drain opening 64 is provided, for example, in the tubular member 611, the bottom member 612, or near the boundary between the tubular member 611 and the bottom member 612. The drain opening 64 is configured to connect the inside and outside of the main container 61. The direction of the pipe axis of the drain opening 64 is, for example, parallel to the y direction. The drain opening 64 is configured to allow an injection pipe, which will be described later, to be attached. The injection pipe is a pipe through which service water to be injected into the filter tube 65 flows. As will be described later, the injection pipe discharges the service water toward the surface of a filter plate provided inside the filter tube 65 opposite the side on which foreign matter adheres.

[0070] The main container 61, the inlet pipe 62, the outlet pipe 63, and the drain opening 64 may be integrally formed.

[0071] The strainer tube 65 is configured to be able to be housed inside the main container 61. The strainer tube 65 has a generally basket shape. The strainer tube 65 includes a tube portion 651 and a bottom portion 652 connected to the tube portion 651. The tube portion 651 has a generally cylindrical shape, and the bottom portion 652 has a generally disk shape. The tube portion 651 has a large number of filter holes 651a, which are through-holes. The filter holes 651a do not allow foreign matter 81 larger than the openings of the filter holes 651a to pass through. In other words, the strainer tube 65 separates foreign matter 81 from seawater 80 containing foreign matter 81. The strainer tube 65 has a strainer tube inlet opening 651b in a position corresponding to the main inlet opening 611a in the tube member 611 of the main container 61, and the strainer tube inlet opening 651b has an opening with a shape substantially the same as or similar to the opening of the main inlet opening 611a.

[0072] A filter plate 653 is provided inside the filter tube 65. In this embodiment, the surface of the filter plate 653 has a rectangular shape, but is not limited to this. The surface of the filter plate 653 has a pair of edges parallel to the y direction. The surface of the filter plate 653 is, for example, generally flat, but a part or all of the surface may be curved. A plurality of through holes 653a are formed in the filter plate 653. The through holes 653a are holes that penetrate between one surface and the other surface of the filter plate 653, and are, for example, holes that penetrate the filter plate 653 in the thickness direction. The filter plate 653 is arranged in the path through which the seawater 80 flows inside the filter tube 65 so that the surface is oblique to the flow direction of the seawater 80. In this embodiment, the flow direction of the seawater 80 is substantially the x direction, so the filter plate 653 is arranged so that the surface is oblique to the x direction and parallel to the y direction. The filter plate 653 may be in the form of a mesh.

[0073] The filter plate 653 is disposed such that its upper end 653U on the upper side in the vertical direction is located vertically above the lower end 63L of the opening of the outlet pipe 63, and its lower end 653L on the lower side in the vertical direction is located at the same height as the lower end 62L of the opening of the inlet pipe 62 or lower than the lower end 62L. In this embodiment, the upper end 653U of the filter plate 653 is connected to a location on the inner surface of the tube portion 651 of the filter cylinder 65 on the outlet pipe 63 side, at approximately the same height as the upper end 63U of the opening of the outlet pipe 63. The lower end 653L of the filter plate 653 is connected to the inner surface of the bottom portion 652 of the filter cylinder 65, i.e., the upper surface on the upper side in the vertical direction. The lower end 653L of the filter plate 653 may also be connected to a location on the inner surface of the tube portion 651 of the filter cylinder 65 on the inlet pipe 62 side, at approximately the same height as or lower than the lower end 62L of the opening of the inlet pipe 62.

[0074] With the filter plate 653 disposed in this manner, foreign matter 81 contained in the seawater 80, particularly highly sticky foreign matter such as jellyfish, easily adheres to and accumulates on the surface of the filter plate 653. When foreign matter 81 adhering to the surface of the filter plate 653 is to be removed by the flow pressure of the fluid, i.e., the force of the flow, the adhering foreign matter can be easily removed from the filter plate 653 by flowing the fluid toward the back surface (rear surface) of the filter plate 653, i.e., the surface opposite to the surface to which the foreign matter 81 is attached. To remove the adhering foreign matter from the filter plate 653, it is not necessary to flow the fluid in the opposite direction to the flow of the seawater 80. In other words, by providing a mechanism for flowing the fluid in a direction different from the opposite direction of the flow of the seawater 80, toward the back surface of the filter plate 653, the adhering foreign matter can be easily removed from the filter plate 653.

[0075] When using a general fluid strainer 5 as a base, it is easier to provide a mechanism for flowing the fluid in a direction other than the opposite direction to the flow of seawater 80 as a mechanism for flowing the fluid toward the back surface of the filter plate 653 than to provide a mechanism for flowing the fluid in the opposite direction to the flow of seawater 80.

[0076] When the strainer tube 65 is not provided with a strainer plate 653, as in a general fluid strainer 5, the foreign matter 81 tends to adhere to and accumulate in an area close to the outlet pipe 63 on the inner surface of the tube portion 651 of the strainer tube 65. In this case, one way to remove the foreign matter 81 adhered to the strainer tube 65 is to flow a fluid in a direction opposite to the surface on which the foreign matter 81 is adhered, but as described above, it is not easy to provide a mechanism for flowing a fluid in the opposite direction to the flow of seawater 80.

[0077] Therefore, placing the filter plate 653 in the path through which the seawater 80 flows inside the filter tube 65 at an angle to the direction of the seawater flow is a great advantage when removing the adhering foreign matter 81 by the flow pressure of the fluid.

[0078] The filter plate 653 is connected to the inner surface of the filter tube 65 by welding, adhesive, an attachment mechanism, or the like. When the filter plate 653 is connected by an attachment mechanism, the filter plate 653 may be configured to be detachable from the filter tube 65, or may be configured to be rotatable about an axis of a horizontal line passing through the lower end 653L of the filter plate 653. If the filter plate is detachable or rotatable from the filter tube, cleaning the inside of the filter tube 65 becomes easier.

[0079] The upper lid 66 is configured so as to be able to close the upper opening of the cylindrical member 611 that constitutes the main container 61. The upper lid 66 has a generally disk or bowl shape.

[0080] The top lid 66 is provided with a top lid opening 67. When the top lid 66 is attached to the main container 61, the top lid opening 67 forms an opening that connects the inside and outside of the main container 61. The top lid opening 67 is configured so that a discharge pipe, which will be described later, can be attached directly or indirectly. The discharge pipe discharges the foreign matter-mixed fluid that has mixed with the foreign matter 81 that has been peeled off from the filter plate 653. The top lid 66 and the top lid opening 67 may be molded integrally.

[0081] The top lid mounting mechanism 68 is a mechanism for mounting the top lid 66 to the main container 61. The top lid mounting mechanism 68 has a configuration similar to that of the top lid mounting mechanism 58 in a typical fluid strainer 5. Therefore, a description of the configuration of the top lid mounting mechanism 68 will be omitted here. Note that the top lid mounting mechanism 68 is not limited to the mounting mechanism of this embodiment, and may be any other known mounting mechanism.

[0082] The bottom 652 of the strainer tube 65 has a bottom plate opening 652a on the vertically lower plate surface of the strainer plate 653, i.e., on the plate surface on the outflow pipe 63 side. The bottom plate opening 652a forms an opening connecting the inside and outside of the strainer tube 65. The bottom plate opening 652a functions as part of a path for the miscellaneous water poured into the strainer tube 65 from an injection pipe (described later). If a member exists in the space between the bottom plate opening 652a and the bottom member 612 of the main container 61, above the injection port of the injection pipe, that member must also have an opening corresponding to the opening of the bottom plate opening 652a. If the bottom 652 of the strainer tube 65 has a mesh structure, the bottom plate opening 652a is not necessarily required, but it is preferable to have one so as not to obstruct the flow of the miscellaneous water.

[0083] Fig. 8 is a diagram showing an example of an installation mode of the fluid strainer according to embodiment 1. As shown in Fig. 8, inlet pipe 62 is connected to one opening of piping 92. The other opening of piping 92 is connected to one opening of inlet valve 101. The other opening of inlet valve 101 is connected to piping 91, which is connected to a seawater inlet.

[0084] The outflow pipe 63 is connected to one opening of a pipe 93. The other opening of the pipe 93 is connected to the suction port of a seawater pump 102. The discharge port of the seawater pump 102 is connected to one opening of a pipe 94. The other opening of the pipe 94 is connected to one opening of an outlet valve 103. The other opening of the outlet valve 103 is connected to one opening of a pipe 95. The other opening of the pipe 95 is connected to the cooling system.

[0085] An injection pipe 71 for miscellaneous water 84 passes through the drain opening 64. The injection pipe 71 has an injection port 71a through which the miscellaneous water 84 is injected into the filter tube 65 and discharged toward a filter plate 653 having a plurality of through-holes 653a formed therein. The injection pipe 71 is shaped and positioned so that the opening of the injection port 71a and the opening of the bottom plate opening 652a in the filter tube 65 correspond to each other in the vertical direction, i.e., the z-direction. The gap between the drain opening 64 and the injection pipe 71 is closed using a predetermined member or mechanism to prevent the inflowing seawater 80 and the injected miscellaneous water 84 from leaking out of the gap. Note that the opening of the bottom plate opening 652a in the filter tube 65 is preferably slightly wider than the opening of the injection port 71a.

[0086] The opening forming the other opening of the injection pipe 71 is connected to one opening of the injection valve 104. The other opening of the injection valve 104 is connected to one opening of the piping 72. The other opening of the piping 72 is connected to equipment provided on board the vessel that supplies utility water 84 at a predetermined pressure. When the injection valve 104 is opened, the utility water 84 is supplied from the piping 72 through the injection valve 104 to the injection pipe 71. The injection pipe 71 discharges the utility water 84 from the inlet 71a. The discharged utility water 84 passes through the opening of the bottom plate opening 652a and flows toward the filter plate 653. Note that instead of the utility water 84, for example, other fresh water stored on board the vessel or utility seawater 86 may be used (see FIG. 8). The utility seawater 86 is, for example, filtered seawater 82.

[0087] One opening of a discharge pipe 73 is connected to the top lid opening 67 of the top lid 66. The other opening of the discharge pipe 73 is connected to one opening of a discharge valve 105. In this embodiment, one opening of a pipe 74 is connected to the other opening of the discharge valve 105, and the other opening of the pipe 74 functions as a discharge port for discharging the foreign substance-mixed fluid 83. When the pipe 74 is not connected, the other opening of the discharge valve 105 functions as a discharge port for the foreign substance-mixed fluid 83. When the discharge valve 105 is directly connected to the top lid opening 67, the pipe 74 functions as a discharge pipe. A foreign substance-mixed fluid storage container 110 is disposed beyond the discharge port. The foreign substance-mixed fluid storage container 110 stores the discharged foreign substance-mixed fluid 83. The foreign substance-mixed fluid storage container 110 is provided with a filter 111 for separating foreign matter 81 from the discharged foreign substance-mixed fluid 83.

[0088] <Method for Removing Foreign Matter from a Fluid Strainer According to the Present Embodiment> A method for removing foreign matter from a fluid strainer according to this embodiment will be described.

[0089] Fig. 9 is a flow diagram showing an example of the flow of the foreign matter removal method according to the first embodiment. Fig. 10A is a diagram showing foreign matter accumulated on a filter plate in a filter tube. Fig. 10B is a diagram showing how the accumulated foreign matter is peeled off by pouring utility water into the filter tube. Fig. 10C is a diagram showing how the peeled foreign matter moves within the fluid strainer. Fig. 10D is a diagram showing how the foreign matter and fluid are discharged from the fluid strainer.

[0090] Before the foreign matter removal operation, as shown in Fig. 10A, seawater 80 containing foreign matter 81 flows in through the inlet pipe 62 in the direction of arrow D1. The foreign matter 81 contained in the seawater 80 is filtered and separated by the filter plate 653 of the filter tube 65. The filtered seawater 82 from which the foreign matter 81 has been separated flows out through the outlet pipe 63 in the direction of arrow D2. The foreign matter 81 accumulates on the plate surface of the filter plate 653 on the inlet pipe 62 side inside the filter tube 65. Due to the flow of seawater 80, most of the foreign matter 81 adheres to an area R1 close to the outlet pipe 63 within the plate surface area of ​​the filter plate 653 on the inlet pipe 62 side.

[0091] The foreign matter removal work is carried out according to the following procedure: It is assumed that the seawater pump 102 has already been stopped.

[0092] 9, in step S1, the inlet and outlet valves of the fluid strainer are closed. Specifically, an operator closes the inlet valve 101 on the inlet pipe 62 side of the fluid strainer 6 and the outlet valve 103 on the outlet pipe 63 side of the fluid strainer 6, bringing these valves into a closed state.

[0093] In step S2, the discharge valve 105 is opened. Specifically, an operator opens the discharge valve 105, and the discharge valve 105 is set to an open state.

[0094] In step S3, the injection of utility water into the strainer tube 65 is started. Specifically, the operator opens the injection valve 104, and starts the injection of utility water 84 into the strainer tube 65.

[0095] In step S4, the foreign matter is removed by the flow pressure of the miscellaneous water. Specifically, the worker keeps the injection valve 104 open for a while and continues to inject the miscellaneous water 84 into the strainer tube 65. As shown in FIG. 10B , the miscellaneous water 84 is sprayed upward inside the strainer tube 65, as indicated by arrow D3. The miscellaneous water 84 attempts to pass through the multiple through-holes 653a in the filter plate 653 from the lower side, i.e., the outlet pipe 63 side, to the upper side, i.e., the inlet pipe 62 side, and comes into contact with the foreign matter 81 adhering to the filter plate 653. This movement of the miscellaneous water 84 applies pressure from the miscellaneous water 84 to the foreign matter 81 adhering to the filter plate 653, causing the adhering foreign matter 81 to be removed from the filter plate 653.

[0096] In step S5, the foreign matter-mixed fluid containing the foreign matter is discharged. Specifically, an operator keeps the inlet valve 104 and the outlet valve 105 open for a while. This promotes the separation of the foreign matter 81 from the filter plate 653 by the miscellaneous water 84, as shown in FIG. 10C. The separated foreign matter 81 is pushed upward by the flow of the miscellaneous water 84. Then, inside the strainer tube 65, i.e., inside the main container 61, the foreign matter-mixed fluid 83, in which the foreign matter 81 is mixed with a fluid such as seawater or miscellaneous water, passes through the upper cover opening 67 and travels through the outlet pipe 73, as shown by arrow D4, for example. Thereafter, as shown in FIG. 10D, the foreign matter-mixed fluid 83 further travels through the outlet pipe 73, passes through the outlet valve 105, and is discharged to the outside of the fluid strainer 6.

[0097] The operator keeps the inlet valve 104 and the outlet valve 105 open until almost all of the foreign substance-containing fluid 83 has been discharged.

[0098] The worker may change the flow rate of the miscellaneous water 84 to be injected when peeling the foreign matter 81 from the filter plate 653 and when discharging the foreign matter-containing fluid 83. For example, the worker may increase the flow rate of the miscellaneous water 84 to be injected relatively when peeling the foreign matter 81 from the filter plate 653, and decrease the flow rate of the miscellaneous water 84 to be injected relatively when discharging the foreign matter-containing fluid 83. By adjusting the flow rate of the miscellaneous water 84 in this way, it is possible to conserve the miscellaneous water 84, for example.

[0099] In step S6, the injection of the miscellaneous water is stopped. Specifically, the worker closes the injection valve 104, bringing the injection valve 104 into a closed state. This operation stops the injection of the miscellaneous water 84.

[0100] In step S7, the valve of the discharge pipe is closed. Specifically, an operator closes the discharge valve 105, bringing the discharge valve 105 into a closed state. The inside of the fluid strainer 6 is filled with utility water or a mixture of utility water and seawater, and it is considered that almost no gases such as air remain. Therefore, it is not necessary to vent the gas inside the fluid strainer 6 here.

[0101] In step S8, the inlet and outlet valves of the fluid strainer are opened. Specifically, an operator opens the inlet valve 101 on the inlet pipe 62 side of the fluid strainer 6 and the outlet valve 103 on the outlet pipe 63 side of the fluid strainer 6, bringing these valves into an open state. Then, seawater 80 begins to flow from the inlet pipe 62 to the outlet pipe 63 of the fluid strainer 6, and the fluid strainer 6 is prepared for operation.

[0102] In step S9, the discharged foreign matter 81 is treated. Specifically, an operator removes the foreign matter 81 mixed in the foreign matter-mixed fluid 83 discharged in step S5 from the filter 111 of the foreign matter-mixed fluid storage container 110 and disposes of it.

[0103] According to the fluid strainer 6 of the first embodiment, the flow pressure of the miscellaneous water 84 injected from the injection pipe 71 causes the foreign matter 81 adhering to the filter plate 653 of the filter tube 65 to be peeled off from the filter plate 653 and pushed up. In addition, the injection of the miscellaneous water 84 causes the foreign matter-mixed fluid 83 containing the foreign matter 81 to flow into the discharge pipe 73 and be discharged to the outside.

[0104] Therefore, according to the fluid strainer 6 of the first embodiment, the foreign matter 81 accumulated in the strainer tube 65 can be discharged to the outside of the fluid strainer 6 without opening or removing the top cover 66. Furthermore, the foreign matter 81 can basically be discharged simply by simply opening and closing valves. Furthermore, the necessary piping and valves can be installed in a concentrated manner around the fluid strainer 6, allowing workers to complete operations with minimal movement.

[0105] As described above, foreign matter 81 accumulated in fluid strainer 6 can be more easily removed. That is, the physical burden on the worker involved in the work of discharging foreign matter 81 from fluid strainer 6 to the outside can be significantly reduced. In addition, the time required for the foreign matter removal work can be significantly reduced.

[0106] Furthermore, according to the fluid strainer 6 of the first embodiment, miscellaneous water 84 or miscellaneous seawater 86 is used as the fluid to be injected into the strainer tube 65. Generally, ships, power plants, factories, and the like, regardless of their size, are provided with equipment or piping to supply miscellaneous water or miscellaneous seawater. Therefore, there is no need to install new equipment to supply the fluid to be injected into the strainer tube 65, which reduces the cost and time required to introduce the fluid strainer 6 of the first embodiment into the piping equipment. In particular, relatively small ships often do not have equipment to supply compressed air, but often have equipment to supply miscellaneous water, miscellaneous seawater, and the like. Therefore, the fluid strainer 6 of the first embodiment can be applied even to small ships.

[0107] First Modification of First Embodiment A modified example of the first embodiment will be described. In this modified example, a suction pump is connected to the discharge pipe of the fluid strainer. In the first embodiment, pressure generated by the fluid injected from the fluid injection pipe is applied to the foreign matter-mixed fluid, facilitating discharge of the foreign matter-mixed fluid. In this modified example, suction force by the suction pump is applied to the foreign matter-mixed fluid, further facilitating discharge of the foreign matter-mixed fluid.

[0108] Fig. 11 is a diagram showing an installation mode of a fluid strainer according to Modification 1 of Embodiment 1. In this modification, as shown in Fig. 11, an opening of pipe 74 communicating with discharge pipe 73 is connected to an inlet of suction pump 106. An outlet of suction pump 106 is connected to one opening of pipe 75. The other opening of pipe 75 is connected to one opening of valve 107. The other opening of valve 107 is connected to drain pipe 76 leading outside the ship. Note that the connection states of pipes and the like other than those described here are the same as those in Embodiment 1.

[0109] The flow of the foreign matter removal method for a fluid strainer according to this modified example will now be described. FIG. 12 is a flow diagram showing an example of the flow of the foreign matter removal method for a fluid strainer according to modified example 1 of embodiment 1. The flow diagram of this modified example shown in FIG. 12 differs from the flow diagram of embodiment 1 shown in FIG. 9 in that steps S10, S5a, and S6a, which are surrounded by dashed lines, are different, and step S9 has been deleted. That is, the contents of steps S1 to S4 and S7 to S8 according to this modified example shown in FIG. 12 are the same as steps S1 to S4 and S7 to S8 in FIG. 9, which shows the flow of the foreign matter removal method according to embodiment 1. Therefore, these steps S1 to S4 and S7 to S8 will be described briefly here, and detailed description will be omitted.

[0110] In step S1, the inlet and outlet valves of the fluid strainer are closed. In step S2, the discharge valve is opened. In step S3, utility water (or utility seawater) is injected into the strainer tube. In step S4, foreign matter is removed by the flow pressure of the utility water.

[0111] In step S10, the suction pump is activated. Specifically, an operator starts the suction pump 106 by performing an operation to start the suction pump 106.

[0112] In step S5a, the foreign matter-containing fluid is discharged overboard. Specifically, the worker keeps the suction pump 106 operating, and discharges the foreign matter-containing fluid 83 in the fluid strainer 6 overboard through the drainage pipe 76. The worker continues to inject utility water 84 and operate the suction pump 106 until almost all of the foreign matter-containing fluid 83 has been discharged.

[0113] In step S6a, the injection of the miscellaneous water and the suction pump are stopped. Specifically, the worker closes the injection valve 104, putting the injection valve 104 in a closed state and stopping the injection of the miscellaneous water 84. The worker also stops the operation of the suction pump 106, stopping the suction pump 106. These operations by the worker complete the process of discharging the foreign-substance-mixed fluid 83.

[0114] In step S7, the valve of the discharge pipe is closed. Specifically, an operator closes the discharge valve 105, and the discharge valve 105 is put into a closed state.

[0115] In step S8, the inlet and outlet valves of the fluid strainer are opened. In this modification, the foreign matter 81 is discharged outside the ship, so unlike the first embodiment, there is no need to process the foreign matter 81.

[0116] According to this modification, the suction pump 106 is used to forcefully discharge the foreign substance-mixed fluid 83. Generally, the bottom of a ship is subjected to relatively strong water pressure from the ocean. If the foreign substance-mixed fluid 83 can be forcefully discharged, it will be possible, for example, to directly discharge the foreign substance-mixed fluid 83 from the bottom of the ship into the ocean. Note that if a line for injecting ocean water is provided instead of a line (piping) for injecting utility water, the foreign substance-mixed fluid 83 can be discharged using the high pressure from the ocean, making it easier to directly discharge the foreign substance-mixed fluid 83 from the bottom of the ship into the ocean.

[0117] If the foreign matter-mixed fluid 83 could be directly discharged into the ocean, it would be possible to avoid a situation in which the inside of the ship becomes contaminated with foreign matter 81, and workers would no longer be bothered by foul odors. In addition, the work of disposing of the foreign matter 81 would be unnecessary, which would significantly reduce the burden on workers. Since there is no need to store the foreign matter 81 in the engine room of the ship, space can be saved. In addition, it would be possible to eliminate a situation in which the floor inside the ship becomes slippery due to the foreign matter 81, allowing workers to work more safely.

[0118] The suction pump 106 is preferably a screw pump. A screw pump is a type of pump that uses a screw-shaped rotor to transport an object. A screw pump is suitable for transporting fluids containing high viscosity or solids, and has features such as a simple structure and easy cleaning and maintenance. If the suction pump 106 is a screw pump, it will be possible to easily discharge the foreign-matter-mixed fluid 83 containing viscous semi-solid foreign matter such as jellyfish.

[0119] <Modification 2 of Embodiment 1> The filter plate 653 may be disposed such that its upper end 653U is at the same height as or higher than the upper end 62U of the opening of the inlet pipe 62, and its lower end 653L is lower than the upper end 62U of the opening of the outlet pipe 63. An injection pipe 71 may be attached to the upper lid opening 67, and a discharge pipe 73 may be attached to the drain opening 64. That is, the filter plate 653 may be inclined in the opposite direction to that of the first embodiment, and the injection pipe 71 and the discharge pipe 73 may be attached in reverse. Even with this configuration, the same effects as those of the first embodiment can be obtained.

[0120] (Embodiment 2) Embodiment 2 is the strainer tube itself housed in the main container of the fluid strainer. The strainer tube according to Embodiment 2 has a configuration similar to that of strainer tube 65 housed in main container 61 of fluid strainer 6 according to Embodiment 1. As described above, strainer tube 65 is provided with strainer plate 653, which is arranged in the path through which seawater 80 containing foreign matter 81 flows inside strainer tube 65, with the plate surface being oblique to the direction in which seawater 80 flows.

[0121] A typical fluid strainer 5 often has, as a standard specification, a drain opening 54 provided in the main container 51 and a top lid opening 57 provided in the top lid 56. The top lid opening 57 is provided so that, for example, a gas vent valve can be connected to vent gas remaining in the main container 51. The drain opening 54 is provided so that, for example, fluid remaining inside the main container 51 can be discharged to the outside. Furthermore, the bottom of the strainer tube 55 may have a mesh structure.

[0122] In such a case, in an existing fluid strainer 5 that has already been installed, the strainer tube 55 can be replaced with a strainer tube provided with a strainer plate similar to the strainer plate 653, and an injection pipe 71 can be connected to the drain opening 54, and an exhaust pipe 73 can be connected to the top cover opening 57, thereby achieving an installation form similar to the installation example of the fluid strainer 6 according to embodiment 1. Therefore, the strainer tube according to embodiment 2 can be traded separately.

[0123] <Modification of the second embodiment> If the bottom of strainer tube 55 does not have a mesh structure but has a plate shape, the bottom must have an opening formed therein for passing service water 84 or service seawater 86 poured from injection pipe 71. Therefore, in a modification of embodiment 2, the bottom of the strainer tube has an opening formed therein that allows passage of service water 84 or service seawater 86 that removes foreign matter 81 adhering to the filter plate. The strainer tube according to the modification of embodiment 2 configured in this manner can also be traded separately.

[0124] (Embodiment 3) A third embodiment is a method for removing foreign matter from a fluid strainer. The fluid strainer includes a main container, a lid attached to the main container, a strainer tube housed in the main container, an inlet pipe attached to the main container through which a first fluid containing foreign matter flows, and an outlet pipe attached to the main container through which a filtered fluid flows. In this fluid strainer, a filter plate is arranged in a path through the strainer tube through which seawater containing foreign matter flows, with the plate surface oblique to the direction of seawater flow. A second fluid is discharged from an inlet pipe attached to the main container or the top lid toward the surface of the filter plate opposite the side to which the foreign matter adheres. A foreign matter-mixed fluid containing the foreign matter removed from the filter plate by the second fluid is discharged from a discharge pipe attached to the main container or the top lid. This method for removing foreign matter from a fluid strainer is also an embodiment of the present invention. The first fluid is, for example, seawater. The second fluid is, for example, utility water, utility seawater, or air.

[0125] (Embodiment 4) In the fourth embodiment, air is used as the second fluid. That is, in the fourth embodiment, based on the first to third embodiments and their modifications, air 88 is used instead of the general service water 84 or general service seawater 86 as the second fluid discharged toward the surface of the filter plate 653 opposite to the side on which the foreign matter 81 adheres (see FIG. 8 ). For example, instead of the piping for injecting the general service water 84 or general service seawater 86 in the first to third embodiments, piping for injecting air 88 is provided. Alternatively, instead of the general service water 84 or general service seawater 86, air 88 is injected into the piping for injecting the general service water 84 or general service seawater 86 in the first to third embodiments. The piping for injecting the second fluid may be connected to an existing compressed air piping or to a newly installed compressed air piping.

[0126] According to the fourth embodiment, the injected and released air can separate the foreign matter 81 adhering to the filter plate 653 from the filter plate 653, and the foreign matter-mixed fluid 83, which is a mixture of the foreign matter 81, seawater 80, and air 88, can be discharged outside the fluid strainer 6.

[0127] <others> In the above embodiment, the fluid strainer is described as being installed in seawater piping on a ship. However, the embodiments of the present invention are not limited to the above embodiment. For example, the fluid strainer may be installed in piping that carries seawater to cool heating elements in facilities such as thermal power plants, nuclear power plants, and paper mills. It may also be installed in piping that carries raw water from a dam in facilities such as hydroelectric power plants and water purification plants. Therefore, the fluid containing foreign matter is not limited to seawater, but may also be natural water, sewage, etc. Furthermore, the fluid injected to remove foreign matter adhering to the filter plate is not limited to utility water, but may also be utility seawater, natural water, purified water, other fresh water, air, etc.

[0128] Although the present invention has been described above with reference to an embodiment and its modifications, the present invention is not limited to the above-described embodiment and modifications, and includes various other embodiments and modifications. Furthermore, the above-described embodiment and modifications have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. All of these fall within the scope of the present invention. Furthermore, numerical values ​​and the like included in the text and figures are merely examples, and the use of different values ​​does not impair the effects of the present invention. [Industrial Applicability]

[0129] The present invention can be used for a fluid strainer installed in seawater or water piping facilities in ships, thermal power plants, nuclear power plants, paper mills, hydroelectric power plants, water purification plants, etc. [Explanation of symbols]

[0130] 6 Fluid strainer, 61 Main container, 62 Inlet pipe, 63 Outlet pipe, 64 Drain opening, 65 Strainer tube, 66 Top cover, 67 Top cover opening, 71 Injection pipe, 72 Piping, 73 Discharge pipe, 74 Piping, 80 Seawater, 81 Foreign matter, 82 Filtered seawater, 83 Fluid containing foreign matter, 84 Service water, 86 Service seawater, 88 Air, 653 Strainer plate

Claims

1. A main container; a lid attached to the main container; a strainer tube accommodated in the main container; an inlet pipe provided in the main container and through which a first fluid containing foreign matter flows; an outlet pipe provided in the main container through which the filtered fluid flows; a filter plate disposed in a path through which the first fluid flows inside the filter cylinder, the plate surface being inclined with respect to the flow direction of the first fluid; a first opening provided in the main container or the lid, to which an injection pipe for a second fluid is attached, the second fluid being discharged toward a surface of the filter plate opposite to the side to which the foreign matter adheres; A second opening is provided in the main container or the lid, and a discharge pipe for a foreign matter-mixed fluid containing foreign matter peeled off from the filter plate by the second fluid is attached to the second opening. Fluid strainer.

2. 2. The fluid strainer of claim 1, The filter plate is arranged so that its upper end in the vertical direction is located above the lower end of the opening of the outlet pipe, and its lower end in the vertical direction is located below the lower end of the opening of the inlet pipe. Fluid strainer.

3. 3. The fluid strainer of claim 2, the first opening is provided in the main container, The second opening is provided in the lid. Fluid strainer.

4. 4. The fluid strainer of claim 3, The strainer tube includes a tube portion and a bottom portion connected to the tube portion, An opening through which the second fluid can pass is formed in the bottom. Fluid strainer.

5. 5. The fluid strainer of claim 4, The injection pipe is shaped and arranged so that the injection port corresponds vertically to the opening formed in the bottom. Fluid strainer.

6. The fluid strainer according to any one of claims 1 to 5, the first fluid is seawater; the second fluid is utility water; Fluid strainer.

7. The fluid strainer according to any one of claims 1 to 5, the first fluid is seawater; the second fluid is general-purpose seawater; Fluid strainer.

8. The fluid strainer according to any one of claims 1 to 5, the first fluid is seawater; the second fluid is air; Fluid strainer.

9. The fluid strainer according to any one of claims 1 to 5, The filter plate has a plurality of through holes formed therein. Fluid strainer.

10. The fluid strainer according to any one of claims 1 to 5, The filter plate is formed into a mesh shape. Fluid strainer.

11. The fluid strainer according to any one of claims 1 to 5, The foreign object includes a jellyfish. Fluid strainer.

12. The fluid strainer according to any one of claims 1 to 5, The main body container is installed in the seawater piping equipment of a ship. Fluid strainer.

13. A strainer tube accommodated in a main body container of a fluid strainer, a filter plate disposed in a path through which a first fluid containing foreign matter flows inside the filter cylinder, the plate surface of the filter plate being inclined with respect to a flow direction of the first fluid; Strainer tube.

14. The strainer tube according to claim 13, The strainer tube includes a tube portion and a bottom portion connected to the tube portion, An opening is formed in the bottom portion, through which a second fluid can pass to remove the foreign matter adhering to the filter plate. Strainer tube.

15. A main container; a lid attached to the main container; a strainer tube accommodated in the main container; an inlet pipe provided in the main container and through which a first fluid containing foreign matter flows; A fluid strainer comprising: an outlet pipe provided in the main container and through which the filtered fluid flows; a filter plate is disposed in a path through which the first fluid flows inside the filter cylinder, with the plate surface being inclined with respect to the flow direction of the first fluid; A second fluid is discharged from an injection pipe attached to the main container or the lid toward a surface of the filter plate opposite to the side on which the foreign matter adheres; A foreign matter-containing fluid containing the foreign matter separated from the filter plate by the second fluid is discharged from a discharge pipe attached to the main container or the lid. Method for removing foreign matter from a fluid strainer.

Images