Sand strainer

Abstract

To provide a sand strainer capable of suppressing the decrease in water flow capacity.SOLUTION: A sand strainer 1 includes: a cylindrical body 11 having an intake port 22 and an outlet 23 facing the intake port 22; a strainer 14 that is placed in a flow path communicating the intake port 22 and the outlet 23 in the body 11, at least a part of which is placed between the intake port 22 and the outlet 23 in the body 11; and a cylindrical spacer 12 that is connected to the body 11 to form a flow path fluid-communicating between the primary side and the secondary side of the strainer 14 bypassing a line connecting the intake port 22 and the outlet 23.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sand strainer for removing solid matter such as sand from water. [Background technology]

[0002] For example, when water is pumped from a water source such as a well, sand may be mixed into the water. In addition to sand, garbage and limescale precipitated from the water may also be mixed into the water. Such solid matter such as sand, garbage and limescale contained in the water makes the water unsuitable for use and may also cause damage to the pump device. Thus, a sand strainer that removes solid matter contained in the water is known. Such a sand strainer has a strainer extending vertically within the body, and removes solid matter contained in the water as the water passes through the strainer, and deposits the removed solid matter within the body.

[0003] However, when solids accumulate on the bottom of the body, the bottom of the strainer is covered with the accumulated solids, and the flow resistance increases. In particular, as the sand strainer is used for an extended period of time, the amount of solids accumulated in the body also increases, and the flow resistance in the strainer increases over time, which may cause the strainer to deform or break, leading to the solids leaking out to the secondary side.

[0004] Therefore, a sand strainer is also known in which a strainer is positioned above the body at an angle with respect to the direction of gravity and the horizontal direction, thereby ensuring the total opening area of ​​the strainer and allowing solids to accumulate below the strainer (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 64-005613 Summary of the Invention [Problem to be solved by the invention]

[0006] However, if the strainer is placed at an angle to the direction of gravity and the horizontal, the strainer will be inclined with respect to the water flow direction, which increases the loss resistance in the strainer. Even if the strainer is placed at an upper position, if the amount of accumulated solids increases and gets caught in the strainer, the water passing capacity will decrease significantly.

[0007] Therefore, an object of the present invention is to provide a sand strainer that can suppress a decrease in water passing capacity. [Means for solving the problem]

[0008] According to one aspect of the present invention, a sand strainer comprises a cylindrical body having an inlet and an outlet facing the suction inlet, a strainer provided on a flow path connecting the suction inlet and the outlet within the body, with at least a portion of the strainer positioned inside the body between the suction inlet and the outlet, and a cylindrical spacer connected to the body, bypassing the straight line connecting the suction inlet and the outlet, and forming a flow path that is fluidly continuous with the primary side and secondary side of the strainer. Effect of the Invention

[0009] The present invention can provide a sand strainer that can suppress a decrease in water passing capacity. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view showing, in partial cross section, the configuration of a sand strainer according to an embodiment of the present invention. [Diagram 2] FIG. 4 is a plan view showing the configuration of the sand strainer with some parts omitted. [Diagram 3] FIG. [Figure 4] FIG. 4 is a perspective view showing the structure of the body of the sand strainer, partially in cross section. [Diagram 5] FIG. 4 is a cross-sectional view showing the configuration of a sand strainer according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the configuration of a sand strainer 1 according to an embodiment of the present invention will be described with reference to Figs. Figure 1 is an oblique view showing, partially in cross section, the configuration of a sand strainer according to an embodiment of the present invention, Figure 2 is a plan view showing the configuration of sand strainer 1 with some parts omitted, Figure 3 is a cross-sectional view showing the configuration of sand strainer 1, and Figure 4 is an oblique view showing, partially in cross section, the configuration of body 11 of sand strainer 1.

[0012] 1 to 3, the sand strainer 1 includes a body 11, one or more spacers 12, a lid 13, a first strainer 14, and one or more second strainers 15. In this embodiment, the direction along the direction of gravity is defined as the up-down direction, and the sand strainer 1 is used in a position where the body 11 is downward and the lid 13 is upward.

[0013] The sand strainer 1 has a body 11 connected to a flange 101 provided on the primary side piping on the water source side and a flange 102 provided on the secondary side piping on the pump device side. Here, the flanges 101 and 102 are provided with, for example, tapered female threads or the like, and are formed so that the piping can be screwed. The sand strainer 1 removes solid matter such as sand, garbage, and scale contained in the water by passing the water conveyed from the primary side to the secondary side through a first strainer 14 provided in the body 11 and a second strainer 15 arranged in parallel with the first strainer 14. Here, the solid matter removed by the sand strainer 1 is not limited to sand, garbage, and scale, and can be set appropriately as long as the movement of the solid matter to the secondary side can be restricted by the first strainer 14 and the second strainer 15.

[0014] 1 to 4, the body 11 includes a main body 21, an intake port 22 provided in the main body 21, an exhaust port 23 provided in the main body 21, and a conduit 24 provided from the intake port 22 to the inside of the main body 21. The body 11 has the intake port 22 connected to a primary piping via a flange 101 and the exhaust port 23 connected to a secondary piping via a flange 102, thereby forming a flow path and a chamber for water flowing through the intake port 22, the main body 21, and the exhaust port 23 in this order.

[0015] The main body 21 is formed in a bottomed tubular shape. For example, the main body 21 is formed in a bottomed cylindrical shape. The main body 21 includes, for example, a cylindrical trunk 21a, a bottom 21b formed at the axial lower end of the trunk 21a, a flange 21c provided at the upper end of the trunk 21a, a seat plate 21d provided on a part of the inner circumferential surface of the trunk 21a, and a holding portion 21e for holding the first strainer 14. The main body 21 forms a flow path that is continuous with the suction port 22 and the discharge port 23 formed in the trunk 21a and above the seat plate 21d, and the first strainer 14 is disposed on the flow path that is continuous with the suction port 22 and the discharge port 23 formed in the main body 21.

[0016] The body 21a has an open upper end and a bottom 21b formed at the lower end. A seat plate 21d is integrally provided on the inner peripheral surface of the lower end side of the body 21a. The body 21a also includes a drain hole 21a1 provided at a part of the lower end, specifically, adjacent to the bottom 21b, and a plug 21a2 detachably provided in the drain hole 21a1. The drain hole 21a1 is provided between the bottom 21b of the body main body 21 and the seat plate 21d in the height direction. The drain hole 21a1 is opened and closed by attaching and detaching the plug 21a2.

[0017] Bottom portion 21b is provided at the lower end of body portion 21a. Bottom portion 21b has bottom plate portion 21b1 that is inclined toward the center, specifically, toward drain hole 21a1, and curved recess portion 21b2 that is provided at a portion of bottom plate portion 21b1 facing drain hole 21a1 and extends toward drain hole 21a1.

[0018] The flange portion 21c has screw holes into which fastening members 90 such as bolts are screwed or holes into which the fastening members 90 are inserted. For example, the flange portion 21c has screw holes at four locations.

[0019] The seat plate 21d is formed in a plate shape. The seat plate 21d is formed integrally with the inner peripheral surface of the body portion 21a, separated from the bottom portion 21b, and extends from below the opening of the inner wall of the body portion 21a on the primary side of the discharge port 23 to near the axial center of the body portion 21a in a direction perpendicular to the axial direction of the body portion 21a. The seat plate 21d is formed so that the first strainer 14 can abut on its upper portion. The periphery of the seat plate 21d holds the first strainer 14 and is formed in a similar shape that is the same as or almost the same as the first strainer 14 that it abuts. For example, the seat plate 21d has an arc-shaped periphery with a radius of curvature that is the same as or slightly larger than the end (lower end) of the first strainer 14 that it abuts. The seat plate 21d has a rib 21d1 that is formed integrally with the lower surface and the inner peripheral surface of the body portion 21a. Seat plate 21d is disposed, for example, below conduit 24 and below the opening of suction port 22. Seat plate 21d forms a space in the lower part inside body portion 21a in which sand is deposited.

[0020] The holding portion 21e is formed to be able to hold the first strainer 14. For example, the holding portion 21e includes a pair of first holding portions 21e1 that hold the first strainer 14 on the discharge port 23 side in the opposing direction of the suction port 22 and the discharge port 23, in other words, on the secondary side in the water flow direction, and a pair of second holding portions 21e2 that hold the first strainer 14 on the suction port 22 side in the opposing direction of the suction port 22 and the discharge port 23, in other words, on the primary side in the water flow direction. The pair of first holding portions 21e1 are, for example, integrally formed with the body portion 21a and extend in the axial direction of the body portion 21a. The pair of first holding portions 21e1 form a contact surface that contacts the first strainer 14.

[0021] The pair of second retaining portions 21e2 are, for example, integrally formed with the body portion 21a and extend in the axial direction of the body portion 21a. The pair of second retaining portions 21e2 form a contact surface that contacts the first strainer 14. The pair of first retaining portions 21e1 and the pair of second retaining portions 21e2 hold the first strainer 14 in two directions along the water flow direction.

[0022] Suction port 22 is formed in a cylindrical shape and is formed so that flange 101 can be fixed by fastening members 90 such as bolts and nuts. As a specific example, suction port 22 includes pipe portion 22a and flange portion 22b. The inner diameter of pipe portion 22a is formed to be slightly larger than the outer diameter of pipe portion 24a (described later) of conduit 24. Pipe portion 22a is provided above seat plate 21d of body portion 21a and at a position facing first strainer 14.

[0023] The discharge port 23 faces the suction port 22 in the radial direction of the body portion 21a. In other words, the suction port 22 and the discharge port 23 are provided in the body portion 21a with a phase difference of 180° and are arranged at the same height position in the body portion 21a. The discharge port 23 is formed in a cylindrical shape and is formed so that the flange 102 can be fixed by fastening members 90 such as bolts and nuts. As a specific example, the discharge port 23 includes a pipe portion 23a and a flange portion 23b. The inner diameter of the pipe portion 23a is formed to be the same diameter as the pipe portion 22a of the suction port 22, for example. The pipe portion 23a is provided at a position above the seat plate 21d of the body portion 21a and facing the first strainer 14.

[0024] The conduit 24 is disposed in the suction port 22. One end of the conduit 24 is disposed in the body 21a and faces the first strainer 14 with a predetermined gap therebetween. As a specific example, the conduit 24 has a pipe portion 24a and a flange portion 24b. The pipe portion 24a is formed with an outer diameter slightly smaller than the inner diameter of the suction port 22 so that it can be disposed in the suction port 22. The flange portion 24b is formed, for example, in the shape of a ring plate formed at one end of the pipe portion 24a so that it can abut against the outer surface of the flange portion 22b. In such a conduit 24, the flange portion 24b is sandwiched between the flange portion 22b and the flange 101, and the end of the pipe portion 24a opposite to the flange portion 24b is disposed in the body 21a and faces the first strainer 14 with a predetermined gap therebetween. Therefore, the length of the pipe portion 24a is longer than the lengths of the pipe portion 22a and the flange portion 22b of the suction port 22.

[0025] As shown in Figs. 1 to 3, the spacer 12 is fixed to the body 11. The number of spacers 12 is set depending on the usage time of the sand strainer 1, the content of sand and the like in the water, and the like. In the example of this embodiment, an example in which one spacer 12 is provided will be described. The spacer 12 has the second strainer 15 disposed therein, and bypasses a part of the water flowing from the suction port 22 through the main body 21 to the discharge port 23. Specifically, the spacer 12 forms a bypass path in which water detours from a straight line connecting the suction port 22 and the discharge port 23 in the body 11 and passes through the second strainer 15.

[0026] The spacer 12 is formed in a tubular shape. For example, the spacer 12 is formed in a cylindrical shape. The spacer 12 includes, for example, a cylindrical body portion 31 with both ends open, flange portions 32 provided on both ends of the body portion 31, a seat portion 33 formed at the lower end of the body portion 31 in the axial direction, and a retaining portion 34 formed on the inner circumferential surface of the body portion 31.

[0027] The outer circumferential shape of the trunk portion 31 is formed to be the same as the outer circumferential shape of the trunk portion 21 a of the main body 21 , for example.

[0028] The flange portion 32 has holes formed therein into which fastening members 90 such as bolts are inserted. For example, holes are formed in four locations in the flange portion 32. One flange portion 32 is fixed to a flange portion 21c of the main body 21 with the fastening members 90, and the other flange portion 32 is fixed to a flange portion 41b (described later) of the lid 13 with the fastening members 90. When a plurality of spacers 12 are provided, adjacent spacers 12 and flange portions 32 are fixed to each other with the fastening members 90.

[0029] The seat 33 is formed at the lower end of the body 31 and holds the lower end of the second strainer 15. When the spacer 12 is fixed to the body 11, the lower surface of the seat 33 abuts against the upper surface of the first strainer 14 in the body 11, and the upper surface of the seat 33 abuts against the lower surface of the second strainer 15 disposed in the body 31.

[0030] The seat 33 is formed in a similar shape that is the same as or almost the same as the shapes of the ends (the upper end of the first strainer 14 and the lower end of the second strainer 15) of the first strainer 14 and the second strainer 15 that it abuts. For example, the seat 33 is formed in an arc shape having a radius of curvature that is the same as or slightly larger than that of the first strainer 14 and the second strainer 15. The seat 33 is formed by connecting one side of the inner wall of the body 31 to the other side of the inner wall via the vicinity of the axial center of the body 31, and a plurality of openings 33a are formed on the primary side and secondary side of the second strainer 15 between the seat 33 and the body 31. The primary side opening 33a is divided from the vicinity of the axial center of the body 31 by a rib 33b that connects the inner wall of the body 31, and two openings are formed. As a result, water moves from the body 11 into the trunk 31 through the opening 33a, and water that has passed through the second strainer 15 in the trunk 31 moves into the trunk 31 through the other openings 33a. In addition, in a configuration having a plurality of spacers 12, these openings 33a are fluidly continuous with the other spacers 12. In addition, the end of the opening of the pipe portion 24a facing the first strainer 14 is disposed midway on the projection plane of the spacer 12 to the primary side opening 33a when viewed from the axial direction of the trunk 31. In other words, the primary side opening 33a is disposed in a vertical direction perpendicular to the horizontal direction to the first strainer 14, which is the movement direction of the water introduced from the conduit 24, with respect to the opening end of the conduit 24 facing the first strainer 14.

[0031] The retaining portion 34 is formed so as to be able to retain the second strainer 15. The retaining portion 34 is formed in the same shape as the retaining portion 21e of the body 11. For example, the retaining portion 34 includes a pair of first retaining portions 34a that retain the second strainer 15 on the secondary side in the water flow direction, and a pair of second retaining portions 34b that retain the second strainer 15 on the primary side in the water flow direction. The pair of first retaining portions 34a are formed integrally with the body portion 31, for example, and extend in the axial direction of the body portion 31. The pair of first retaining portions 34a form a contact surface that abuts against the second strainer 15.

[0032] The pair of second retaining portions 34b are, for example, integrally formed with the body portion 31 and extend in the axial direction of the body portion 31. The pair of second retaining portions 34b form a contact surface that contacts the second strainer 15. The pair of first retaining portions 34a and the pair of second retaining portions 34b hold the second strainer 15 in two directions along the water flow direction.

[0033] The lid 13 includes a cover 41 and an inspection cover 42. The cover 13 is fixed to a screw hole in the flange portion 21c of the body 11 by a fastening member 90 such as a bolt via a packing such as an O-ring. The cover 41, for example, has one or more inspection windows 41a formed therein. The cover 41 has a flange portion 41b into which the fastening member 90 is inserted and held. The flange portion 41b, for example, has a plurality of holes into which the fastening member 90 is inserted. The inspection cover 42 covers the window 41a of the cover 41. The inspection cover 42 is formed, for example, from a transparent material so that the inside of the body 11 and the inside of the spacer 12 can be seen from the window 41a.

[0034] The first strainer 14 and the second strainer 15 are provided on the body 11 and the spacer 12, respectively. The first strainer 14 and the second strainer 15 are curved with a predetermined radius of curvature and formed in a semi-cylindrical or arch shape that is long in one direction. The first strainer 14 and the second strainer 15 are formed, for example, in a mesh shape or with a plurality of openings with a predetermined hole diameter. For example, the first strainer 14 and the second strainer 15 are formed in the same shape and the same mesh size. The first strainer 14 and the second strainer 15 include, for example, strainer portions 14a, 15a that allow water to pass through but do not allow solids with a predetermined particle size or larger to pass through, and seal portions 14b, 15b provided on the periphery of the strainer portion 14a. The first strainer 14 and the second strainer 15 extend in the axial direction of the body portions 21a, 31, and are held by the body portions 21a, 31 in a position curved radially in the axial direction of the body portions 21a, 31.

[0035] Specifically, the first strainer 14 provided in the body 11 has a curved outer peripheral surface side facing the suction port 22 and a curved inner peripheral surface side facing the discharge port 23, and has a lower end held by the seat plate 21d with the axis of the first strainer 14 passing through the center of curvature of the curved surface aligned with the axis of the trunk portion 21a, and has both curved end portions held by a pair of first holding portions 21e1 and a pair of second holding portions 21e2, and an upper end held by the seat portion 33 of the spacer 12. At least a portion of the first strainer 14 is disposed between the suction port 22 and the discharge port 23 provided opposite the body 11, and faces the suction port 22 and the discharge port 23.

[0036] In addition, the second strainer 15 provided on the spacer 12 has its outer peripheral surface side curved toward the primary side opening 33a and its inner peripheral surface side curved toward the secondary side opening 33a, and its lower end is held in the seat 33 with the axis of the second strainer 15 passing through the center of curvature of the curved surface aligned with the axis of the body 21a, and the curved end portions on both ends are held by a pair of first retaining portions 34a and a pair of second retaining portions 34b, and the upper end is held by the lid 13.

[0037] As a result, the first strainer 14 and the second strainer 15 have sealing portions 14b, 15b on their periphery (four sides) that fit tightly against the body 11, spacer 12 and lid 13, maintaining a liquid-tight seal between the body 11, spacer 12 and lid 13, allowing water to pass through only through the strainer portions 14a, 15a.

[0038] In the sand strainer 1 thus constructed, a space is formed between the bottom 21b and the seat plate 21d by providing the seat plate 21d that holds the lower end of the first strainer 14 on the body 11. Thus, as shown by the solid arrow in FIG. 3, water moves from the suction port 22 to the discharge port 23, while solid matter such as sand moves to the space below the seat plate 21d by its own weight or by being caught by the strainer portion 14a, as shown by the dashed arrow. Also, a part of the water in the trunk portion 21a of the body 11 moves through the primary side opening 33a into the trunk portion 31 of the spacer 12, and moves through the second strainer 15 and the secondary side opening 33a of the second strainer 15 to the trunk portion 21a of the body 11 and to the secondary side of the first strainer 14. Thus, the solid matter is deposited in the space below the seat plate 21d, and the first strainer 14 can be prevented from being covered by the deposited solid matter. In addition, by making the peripheral edges of the seat plate 21d that holds the first strainer 14 and the seat portion 33 that holds the second strainer 15 similar in shape to the first strainer 14 and the second strainer 15, it is possible to prevent solid matter from accumulating on the seat plate 21d and the seat portion 33, respectively.

[0039] As described above, the sand strainer 1 can reduce the risk of the first strainer 14 being clogged by solid matter by providing a space for solid matter to accumulate below the seat plate 21d on which the first strainer 14 is installed. In addition, the first strainer 14 is provided along the axial direction of the body 21a, that is, extending in a direction perpendicular to the opposing direction of the inlet 22 and the outlet 23, which is the water flow direction, so that the obstruction of the water flow can be suppressed and loss resistance can be minimized. In addition, even if solid matter accumulates up to the first strainer 14 in the body 11 and partially blocks the first strainer 14, reducing the water passing function of the first strainer 14, water flows through the second strainer 15 that is not clogged by solid matter in the spacer 12, so that the sand strainer 1 can reduce the reduction in water passing capacity. In addition, in the sand strainer 1, a portion of the water sucked in from the suction port 22 is diverted to the spacer 12, thereby maintaining water flow capacity, thereby preventing solid matter from accumulating on the first strainer 14 and causing the first strainer 14 to be damaged by the water pressure of the fluid.

[0040] In addition, the seat plate 21d has a rib 21d1 on the lower side, so that the strength can be improved even if the seat plate 21d is formed integrally with the inner peripheral surface of the body 21a and extends in the radial direction. In addition, the rib 21d1 is provided below the seat plate 21d, so that it is disposed in a part of the circumferential direction of the space provided below the seat plate 21d where the solids are accumulated, and it is possible to suppress the generation of a swirling flow in the space. As a result, the sand strainer 1 can prevent a swirling flow from occurring in the space where the solids are accumulated, and the accumulated solids can be prevented from moving inside the body 21a, and the solids can be efficiently collected.

[0041] In addition, by providing the conduit 24, which opens at a position closer to the first strainer 14 than the suction port 22, at the suction port 22, the water sent from the primary piping is introduced into the body 21a near the first strainer 14, and an increase in loss resistance can be suppressed. In addition, the end of the opening of the conduit 24 facing the first strainer 14 is located near the first strainer 14 and is disposed midway on the projection plane of the spacer 12 to the primary side opening 33a as viewed from the axial direction of the body 31. This shortens the horizontal distance that the water introduced from the conduit 24 can move to the first strainer 14, which is the moving direction of the water introduced from the conduit 24. This reduces the amount of water that flows into the opening 33a due to diffusion in the vertical direction perpendicular to the horizontal direction (the moving direction of the water introduced from the conduit). This allows more water to be introduced into the first strainer 14 than when the end of the opening of the conduit 24 is located near the suction port 22. In addition, by positioning the opening of the suction port 22 and the opening of the conduit 24 above the seat plate 21d, the introduced water passes through the first strainer 14 efficiently, thereby suppressing an increase in loss resistance.

[0042] As described above, the sand strainer 1 is provided with the first strainer 14 and the second strainer 15 on the body 11 and the spacer 12, respectively, and part of the water on the primary side of the first strainer 14 moves to the spacer 12 and passes through the second strainer 15, and then water moves from the secondary side of the second strainer 15 to the secondary side of the first strainer 14. That is, the sand strainer 1 has the first strainer 14 and the second strainer 15 arranged in parallel.

[0043] Therefore, since the sand strainer 1 has the first strainer 14 and the second strainer 15, the total area of ​​the first strainer 14 and the second strainer 15 is increased compared to a configuration in which only the first strainer 14 is provided, making it less likely to become clogged with solid matter and reducing the frequency of cleaning and replacement of the first strainer 14 and the second strainer 15.

[0044] Furthermore, if the first strainer 14 and the second strainer 15 are damaged, the probability of multiple strainers breaking simultaneously is low in this embodiment, and therefore it is sufficient to replace only one of the first strainer 14 and the second strainer 15 that is damaged.

[0045] Furthermore, when increasing the area of ​​the same strainer, the strength of the individual strainers can be increased by providing multiple strainers, such as the first strainer 14 and the second strainer 15, as in this embodiment, rather than making a single strainer larger. Therefore, since the sand strainer 1 can provide the first strainer 14 and the second strainer 15 with suitable strength, damage to the first strainer 14 and the second strainer 15 can also be suppressed.

[0046] In addition, since the first strainer 14 and the second strainer 15 are arranged in parallel vertically, the first strainer 14, which is the lower strainer, is more likely to become clogged than the second strainer 15. Therefore, when clogging occurs, only the first strainer 14 needs to be cleaned or replaced, which makes the cleaning and replacement work easier and also increases the lifespan of the second strainer 15. In addition, when it is necessary to order a new first strainer 14 to replace the first strainer 14, the spacer 12 can be removed, and the second strainer 15 can be housed in the body 11 instead of the first strainer 14, and the lid 13 can be fixed to the body 11 for use. Therefore, the sand strainer 1 can be used continuously without stopping the function of the sand strainer 1 or stopping the water supply in order to replace the first strainer 14.

[0047] Furthermore, if the frequency of clogging or the amount of accumulation is greater than initially expected given the usage conditions of the sand strainer 1, and the first strainer 14 needs to be cleaned or replaced more frequently, it is possible to add a further spacer 12 and a second strainer 15 to the upper section of the spacer 12. By adding the spacer 12 and the second strainer 15, the frequency of cleaning or replacement of the first strainer 14, or the first strainer 14 and the second strainer 15, can be significantly reduced.

[0048] As described above, according to the sand strainer 1 according to the embodiment of the present invention, by having the spacer 12, it is possible to suppress a decrease in water passing capacity.

[0049] The present invention is not limited to the above-mentioned embodiment. For example, the sand strainer 1 may not have the conduit 24. Although the body 21a, 31 is cylindrical, the body 21a, 31 may be rectangular. The first strainer 14 and the second strainer 15 may not be curved, such as semicircular or arched, and may be flat, for example. The spacer 12, the first strainer 14, and the second strainer 15 are not limited to the above-mentioned embodiment. For example, the sand strainer 1 may have more spacers 12 and second strainers 15, such as two or more. In this way, by increasing the number of spacers 12 and second strainers 15, the sand strainer 1 can increase the flow area of ​​the bypass flow path and further prevent the water passing capacity from decreasing.

[0050] In the above example, the first strainer 14 and the second strainer 15 have the same mesh size, but the present invention is not limited to this and the first strainer 14 and the second strainer 15 may have different mesh sizes. In this case, it is preferable to make the mesh size of the first strainer 14 provided in the body 11 on which solids are deposited smaller than the mesh size of the second strainer 15. Even if the mesh size of the first strainer 14 is reduced and clogging or the amount of deposition increases, the presence of the second strainer 15 can prevent a decrease in the water passing function, thereby preventing damage to the first strainer 14.

[0051] In the above example, the sand strainer 1 has a seat plate 21d on the body 11, and a space for accumulating solid matter is provided below the seat plate 21d, but the present invention is not limited to this. For example, as shown in FIG. 5, the body 11 may have no seat plate 21d, and the first strainer 14 may be held by the bottom 21b. That is, by providing the spacer 12 on the body 11, the sand strainer 1 can suppress a decrease in water passing capacity even if the first strainer 14 of the body 11 is blocked by accumulated solid matter, since water passes through the spacer 12 provided with the second strainer 15. The spacer 12 may be provided below the body 11, instead of above the body 11. In such a case, the spacer 12 may be a bottomed tubular shape, and an opening that moves into the spacer 12 and is continuous with the primary side and secondary side of the second strainer 15 in the spacer 12 may be provided at the bottom 21b of the body 11. Moreover, the spacers 12 may be provided above and below the body 11, respectively.

[0052] In the above example, the sand strainer 1 has the body 11 and the spacer 12, and has the first strainer 14 and the second strainer 15 provided on the body 11 and the spacer 12, respectively. However, the sand strainer 1 may have a configuration in which one strainer is provided across the body 11 and the spacer 12. In such a configuration, the strainer may have a shape having a height dimension from a part of the body 11 that supports the strainer, for example, the upper surface of the bottom 21b or the seat plate 21d, to the lower surface of the lid 13 fixed to the spacer 12. For example, the first strainer 14 or the second strainer 15 set to such dimensions can be used. In the body 11, at least a part of the strainer is disposed between the suction port 22 and the discharge port 23 provided opposite the body 11, and faces the suction port 22 and the discharge port 23. With this configuration, the height dimension of the space on the primary side of the strainer and the height dimension of the space on the secondary side are increased by the body 11 and the spacer 12, so that even if solids accumulate and block the bottom of the strainer, the water passage function is reduced and the strainer can be prevented from being damaged. In this way, when a sand strainer 1 uses one common strainer for the body 11 and the spacer 12, the spacer 12 may be configured without the seat portion 33.

[0053] That is, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made in the implementation stage without departing from the gist of the invention. In addition, the embodiments may be implemented in appropriate combination, and in that case, the combined effect can be obtained. Furthermore, the above-mentioned embodiment includes various inventions, and various inventions can be extracted by combinations selected from the multiple components disclosed. For example, if the problem can be solved and the effect can be obtained even if some components are deleted from all the components shown in the embodiment, the configuration from which the components are deleted can be extracted as an invention. [Explanation of symbols]

[0054] 1...sand strainer, 11...body, 12...spacer, 13...lid, 14...first strainer, 14a...strainer portion, 14b...seal portion, 15...second strainer, 15a...strainer portion, 15b...seal portion, 21...body main body, 21a...torso portion, 21a1...drain hole, 21a2...plug, 21b...bottom portion, 21b1...bottom plate portion, 21b2...recess, 21c...flange portion, 21d...seat plate, 21d1...rib, 21e...retaining portion, 21e1...first retaining portion, 21e2... Second retaining portion, 22...suction port, 22a...pipe portion, 22b...flange portion, 23...discharge port, 23a...pipe portion, 23b...flange portion, 24...conduit, 24a...pipe portion, 24b...flange portion, 31...body portion, 32...flange portion, 33...seat portion, 33a...opening, 33b...rib, 34...retaining portion, 34a...first retaining portion, 34b...second retaining portion, 41...cover, 41a...window, 41b...flange portion, 42...inspection cover, 90...fastening member, 101...flange, 102...flange.

Claims

1. A cylindrical body having a suction port and a discharge port facing the suction port; a strainer provided on a flow path connecting the suction port and the discharge port in the body, and at least a portion of the strainer being disposed between the suction port and the discharge port inside the body; a cylindrical spacer connected to the body, bypassing a straight line connecting the suction port and the discharge port, and forming a flow path fluidly continuous with a primary side and a secondary side of the strainer; A sand strainer equipped with:

2. The strainer includes a first strainer provided inside the body and a second strainer provided inside the spacer, 2. The sand strainer according to claim 1, wherein the spacer comprises a body portion in which the spacer is provided, and a seat portion for holding the second strainer provided within the body portion.

3. The sand strainer according to claim 2 , wherein the seat portion has a shape similar to a portion of the strainer that abuts against the seat portion.

4. The sand strainer according to claim 2 , wherein the first strainer and the second strainer have the same shape.

5. The spacer has a body portion and a seat portion that holds the strainer, and includes a primary side opening and a secondary side opening that are formed at an end portion of the body portion by the seat portion, The body has a conduit facing the strainer, the conduit forming a flow path from the suction port to a midpoint of a projected surface of the primary side opening of the spacer, 2. The sand strainer of claim 1, wherein the primary opening is disposed relative to an axis of the body that is disposed perpendicular to the open end of the conduit that faces the strainer.

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