Sand strainer

Abstract

To provide a sand strainer capable of suppressing the increase in loss resistance while preventing the strainer from being clogged by solid matter.SOLUTION: A sand strainer 1 includes: a strainer 14; a body 11 that has a main body 21 formed cylindrical with a bottom, a seat 21d for holding the strainer 14, which is provided at a distance from the bottom 21b of the main body 21, an intake port 22 opposite the strainer 14, and an outlet 23 facing the strainer 14 and the intake port 22. The strainer 14 is placed in a flow path that is formed in the main body 21 communicating 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 both 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, when the strainer is disposed at an angle with respect to the direction of gravity and the horizontal direction, the strainer is inclined with respect to the direction of water flow, and this increases the loss resistance in the strainer.

[0007] Therefore, an object of the present invention is to provide a sand strainer that can prevent the strainer from being blocked by solid matter and can also prevent an increase in loss resistance. [Means for solving the problem]

[0008] According to one aspect of the present invention, a body is provided with a strainer, a body main body formed into a cylindrical shape with a bottom, a seat plate for holding the strainer and spaced apart from the bottom of the body main body, an intake port facing the strainer, and an exhaust port facing the strainer and the intake port, and the strainer is provided on a flow path formed within the body main body that connects the intake port and the exhaust port. Effect of the Invention

[0009] The present invention can provide a sand strainer that can prevent the strainer from being blocked by solid matter and can also prevent an increase in flow path resistance. [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. 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. FIG. 1 is an oblique view showing the configuration of a sand strainer according to an embodiment of the present invention, partially in cross section, FIG. 2 is a plan view showing the configuration of sand strainer 1 with some parts omitted, and FIG. 3 is a cross-sectional view showing the configuration of sand strainer 1.

[0012] 1 to 3, the sand strainer 1 includes a body 11, a lid 13, and a strainer 14. 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 to which a flange 101 is connected on the primary side piping on the water source side and a flange 102 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 strainer 14 provided in the body 11. 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 strainer 14.

[0014] The body 11 includes a main body 21, an inlet 22 provided in the main body 21, an outlet 23 provided in the main body 21, and a conduit 24 provided from the inlet 22 to the inside of the main body 21. The body 11 has the inlet 22 connected to a primary side pipe via a flange 101 and the outlet 23 connected to a secondary side pipe via a flange 102, thereby forming a flow path and a chamber for water flowing sequentially through the inlet 22, the main body 21, and the outlet 23.

[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 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 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 recessed 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 21c1 into which fastening members 90 such as bolts are screwed. For example, the flange portion 21c has the screw holes 21c1 formed 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 the vicinity of 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 strainer 14 can abut on the upper portion. The periphery of the seat plate 21d holds the strainer 14 and is formed in a similar shape that is the same as or almost the same as the 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 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 strainer 14. For example, the holding portion 21e includes a pair of first holding portions 21e1 that hold the 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 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 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 strainer 14. The pair of first retaining portions 21e1 and the pair of second retaining portions 21e2 hold the 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 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 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 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 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] The lid 13 includes a cover 41 and an inspection cover 42. The cover 13 is fixed to a screw hole 21c1 of a 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 41b into which the fastening member 90 is inserted and held. The flange 41b, for example, has a plurality of holes 41c 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 can be seen from the window 41a.

[0026] The strainer 14 is curved with a predetermined radius of curvature and formed in a semi-cylindrical or arch shape that is long in one direction. The strainer 14 has, for example, a plurality of openings with a predetermined hole diameter, or is formed in a mesh shape. The strainer 14 includes, for example, a strainer portion 14a that allows water to pass but does not allow solid matter having a predetermined particle size or larger to pass through, and a seal portion 14b provided on the periphery of the strainer portion 14a. The strainer 14 extends in the axial direction of the body portion 21a and is held in the body portion 21a in a position curved radially in the axial direction of the body portion 21a. Specifically, the strainer 14 has a curved outer peripheral surface facing the suction port 22 and a curved inner peripheral surface facing the discharge port 23, and the axis of the strainer 14 passing through the center of curvature of the curved surface is aligned with the axis of the body portion 21a, the lower end is held by the seat plate 21d, the curved ends on both ends are held by a pair of first holding portions 21e1 and a pair of second holding portions 21e2, and the upper end is held by the lid 13. As a result, the seal portions 14b provided on the periphery (four sides) of the strainer 14 are in close contact with the body 11 and the lid 13, and the gap between the body 11 and the lid 13 is kept liquid-tight, allowing water to pass only through the strainer portion 14a.

[0027] 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 for holding the lower end of the 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. Thus, the solid matter accumulates in the space below the seat plate 21d, and the strainer 14 can be prevented from being covered with the accumulated solid matter. In addition, by forming the periphery of the seat plate 21d for holding the strainer 14 into a shape similar to that of the strainer 14, the accumulation of solid matter on the seat plate 21d can be prevented.

[0028] As described above, the sand strainer 1 is able to reduce the risk of the strainer 14 being clogged with solid matter by providing a space for solid matter to accumulate below the seat plate 21d on which the strainer 14 is mounted.

[0029] That is, by providing a space between the bottom 21b and the seat plate 21d, the space below the seat plate 21d becomes a space for accumulating solid matter, and a larger amount of solid matter can be accumulated compared to the configuration of the prior art that does not have such a space. Also, since the bottom 21b is configured not to be in contact with the strainer 14, the area of ​​the bottom 21b can be made larger compared to the configuration of the prior art in which the strainer contacts the bottom, so that the bottom plate portion 21b1 that is inclined toward the drain hole 21a1 and the recessed portion 21b2 that extends toward the drain hole 21a1 can be provided, and solid matter can be discharged from the drain hole 21a1 more smoothly.

[0030] In addition, the 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 direction of water flow, thereby preventing impediment to the water flow and minimizing loss resistance.

[0031] 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.

[0032] Furthermore, by providing the conduit 24, which opens at a position closer to the 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 strainer 14, thereby making it possible to suppress an increase in loss resistance. Furthermore, by locating the opening of the suction port 22 and the opening of the conduit 24 above the seat plate 21d, the introduced water efficiently passes through the strainer 14, making it possible to suppress an increase in loss resistance.

[0033] As described above, according to the sand strainer 1 according to the embodiment of the present invention, it is possible to prevent the strainer 14 from being blocked by solid matter and to prevent an increase in loss resistance.

[0034] The present invention is not limited to the above-described embodiment. For example, the sand strainer 1 may not have the conduit 24. Although the body 21a is cylindrical in shape, the present invention is not limited to this and may be rectangular. The strainer 14 does not have to be curved, such as semicircular or arched, and may be flat, for example.

[0035] 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]

[0036] 1...sand strainer, 11...body, 13...lid, 14...strainer, 14a...strainer portion, 14b...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, 21c1...screw hole, 21d...seat plate, 21d1...rib, 21e...holding portion, 21e 1...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, 41...cover, 41a...window, 41b...flange, 41c...hole, 42...inspection cover, 90...fastening member, 101...flange, 102...flange.

Claims

1. A strainer and a body including a main body formed in a bottomed cylindrical shape, a seat plate for holding the strainer, the seat plate being spaced apart from the bottom of the main body, a suction port facing the strainer, and a discharge port facing the strainer and the suction port; Equipped with The strainer is a sand strainer provided on a flow path formed within the body that connects the suction port and the discharge port.

2. 2. The sand strainer according to claim 1, wherein the peripheral edge of the base plate has a shape similar to a portion of the strainer that abuts against the base plate.

3. The sand strainer according to claim 1 , wherein the body has a conduit provided at the suction port, the end of the conduit opening at a position closer to the strainer than the suction port.

4. 2. The sand strainer according to claim 1, wherein the body has an openable and closable drain hole between the bottom and the seat plate.

Images