Valve structure and valve device

Abstract

To provide a valve structure and a valve device capable of maintaining seating of a valve body on a seating surface.SOLUTION: In a valve device 19, a valve seat part 51 comprises a base part 52 which forms a first seating surface 52a of a valve body 61. The base part 52 has a through hole 52d which penetrates in a water circulation direction in a circulation passage R. The valve body 61 has a shaft part 63 attached to the base part 52, and a valve tongue part 62 that extends from the shaft part 63 and is elastically deformable between a state of being seated on the first seating surface 52a and a state of being spaced apart from the first seating surface 52a. The valve tongue part 62 and the base part 52 are hydrophobic.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a valve structure and a valve device. [Background technology]

[0002] For example, Patent Document 1 discloses a connector that functions as a check valve to prevent backflow of wastewater in a drain pipe. The connector disclosed in Patent Document 1 is connected to a drain pipe for draining air conditioning equipment. The connector includes a connector body that includes an upstream split connector body and a downstream split connector body, and also includes a valve body that is installed between the upstream split connector body and the downstream split connector body.

[0003] The valve body includes a ring-shaped seating body and a circular, thin valve plate. The valve plate is disposed in intimate contact with the downstream surface of the seating body. The valve plate is attached integrally to the seating body via a valve plate support part at the center, and is flexible. The valve plate prevents outside air from entering the house from the tip of the drain pipe when the indoor unit side of the air conditioner becomes negative pressure. The drainage water generated in the indoor unit elastically deforms the valve plate so as to separate from the seating body due to the combination of its flow force and its own weight. As a result, the drainage water is discharged downstream. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-158238 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the connector disclosed in Patent Document 1, when rainwater or the like tries to backflow from the tip of the drain pipe, the rainwater or the like flows into the connector from the downstream split connector body side. At this time, if the water pressure of the rainwater trying to backflow is high, the valve plate is pressed against the seating body, preventing the backflow. However, if the water pressure of the rainwater trying to backflow is low, the valve body is deflected and deformed so as to move away from the seating body. Then, the valve body cannot maintain its seated state against the seating body, and the rainwater starts to backflow. [Means for solving the problem]

[0006] Various aspects of the attachment for solving the above problems will now be described. [Aspect 1] a valve structure comprising: a valve body disposed midway through a flow passage connecting a water inlet and an outlet; and a valve seat portion on which the valve body sits; the valve body separates from the valve seat portion when subjected to water pressure from the water inlet side to the outlet side, thereby allowing the water to flow; and the seating of the valve body on the valve seat portion prevents the water from flowing back from the outlet side to the inlet side, wherein the valve seat portion comprises a base portion forming a seating surface of the valve body, and the base portion has a through hole formed therein, the valve body comprising: a shaft portion attached to the base; and a valve tongue portion extending from the shaft portion and elastically deformable between a state in which it is seated on the seating surface and a state in which it is separated from the seating surface,

[0007] [Aspect 2] The valve structure according to [Aspect 1], wherein each of the valve body and the base is formed from a hydrophobic material.

[0008] [Aspect 3] 1. A valve device comprising: a valve device main body defining a flow passage connecting a water inlet and an outlet, a valve element disposed midway through the flow passage, and a valve seat on which the valve element seats, wherein the valve element separates from the valve seat when subjected to water pressure from the water inlet side to the outlet side, thereby allowing the water to flow, and wherein the valve element seats on the valve seat to prevent a backflow of the water from the outlet side to the inlet side, wherein the valve seat has a base forming a seating surface of the valve element, and the base has a through hole formed therein, the valve element comprising: a shaft attached to the base, and a valve tongue extending from the shaft and elastically deformable between a state in which it is seated on the seating surface and a state in which it is spaced from the seating surface,

[0009] [Aspect 4] A valve device as described in [Aspect 3], further comprising a cylindrical insert that is inserted into either the inlet or the outlet of the valve device body, the valve seat portion being held by the insert, and the insert being inserted into either the inlet or the outlet while holding the valve seat portion.

[0010] [Aspect 5] The valve device according to [Aspect 4], wherein the valve seat portion has a peripheral wall extending upright from an outer edge of the base portion, and the peripheral wall is fitted onto the insert.

[0011] [Aspect 6] A valve device as described in [Aspect 5], wherein an insertion groove portion is defined on the side of the valve seat portion where the peripheral wall is erected, which clamps the insertion end portion of the insert into either the inlet or the outlet from inside and outside in the radial direction of the insert.

[0012] [Aspect 7] A valve device as described in [Aspect 5] or [Aspect 6], wherein the insert is detachable from the valve device main body, the valve seat is made of a hydrophobic material, which is a flexible rubber, and the peripheral wall is integrally formed with a sealing portion that seals between the outer surface of the insert and the inner surface of the valve device main body.

[0013] [Aspect 8] A valve device according to any one of [Aspect 4] to [Aspect 7], wherein the insert body is provided with a grip portion protruding outward from the valve device body on the side opposite to the side where it is inserted into the valve device body.

[0014] [Aspect 9] A valve device described in any one of [Aspect 3] to [Aspect 8], wherein the valve body is formed smaller than the internal space at either the inlet or the outlet, and the base is capable of supporting the valve body regardless of whether the valve tongue portion is positioned on either side of the two faces of the base in the plate thickness direction.

[0015] [Aspect 10] A valve device described in any one of [Aspect 3] to [Aspect 9], wherein the base has an outer circumferential portion surrounding the seating surface with the seating surface on the inside, and in the flow direction of the water in the flow passage, the seating surface is recessed further than the outer circumferential portion on the side opposite the direction in which the valve tongue portion moves away from the seating surface.

[0016] [Aspect 11] A valve device described in any one of [Aspect 3] to [Aspect 10], wherein the valve device main body has a mesh portion on the outlet side that suppresses the passage of foreign matter, and the valve device has a foreign matter passage prevention material upstream of the mesh portion in the water flow direction. Effect of the Invention

[0017] The present invention can maintain the valve body seated on the seating surface. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view showing an underground burial box and an underground burial pipe. [Diagram 2] FIG. 2 is an exploded perspective view showing the valve device body and the insertion member. [Diagram 3] FIG. 3 is a cross-sectional view showing the valve structure and the valve device. [Figure 4] FIG. 4 is a perspective view showing the valve device body and the insertion member. [Diagram 5] FIG. 5 is a perspective view showing the valve device body and the insertion member. [Figure 6] FIG. 6 is a cross-sectional view of the valve structure and valve device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, one embodiment of the valve structure and the valve device will be described with reference to Figs. <Laying route> As shown in Fig. 1, the wiring 10 buried in the ground UG is inserted into a laying path buried in the ground UG. The laying path buried in the ground UG includes a plurality of underground buried boxes 11 buried at intervals and underground buried pipes 16 connecting adjacent underground buried boxes 11.

[0020] <Underground burial boxes and underground burial pipes> The underground burial box 11 includes an underground burial box 11 made of synthetic resin material such as a handhole, and an underground burial box 11 made of concrete such as a manhole. In the following description, the underground burial box 11 made of synthetic resin material will be used.

[0021] The underground burial box 11 is in the shape of a square box and includes a rectangular plate-shaped bottom wall 12 and four side walls 13 standing along the periphery of the bottom wall 12. The bottom wall 12 has an outer bottom surface 12a which is one surface of the bottom wall 12 in the wall thickness direction, and an inner bottom surface 12b which is the opposite surface of the outer bottom surface 12a in the wall thickness direction of the bottom wall 12. The side wall 13 has an outer surface 13a which is one surface of the side wall 13 in the wall thickness direction, and an inner surface 13b which is the opposite surface of the outer surface 13a in the wall thickness direction of the side wall 13.

[0022] The underground burial box 11 is a square box with a bottom that opens on the top. The top of the underground burial box 11 is closed by a lid 17 installed on the top of the underground burial box 11. The underground burial box 11 is buried in the ground UG so that the bottom wall 12 is on the lower side in the direction of gravity and the lid 17 is on the upper side in the direction of gravity. The space S of the underground burial box 11 is defined by the inner bottom surface 12b of the bottom wall 12 and the inner surfaces 13b of the four side walls 13, and the space S is closed by the lid 17. Each of the bottom wall 12 and the side walls 13 is a defining body that defines the space S. A through hole 14 can be formed in each of the bottom wall 12 and the side walls 13 by a tool not shown.

[0023] A through hole 14 used for attaching the valve device 19 is formed in one side wall 13 of the underground burial box 11 buried in the ground UG. The through hole 14 used for attaching the valve device 19 to the side wall 13 is referred to as an attachment through hole 141.

[0024] Further, a through hole 14 for connecting an underground buried pipe 16 via a connector 15 is formed in the side wall 13 of the underground buried box 11 buried in the ground UG. The through hole 14 for connecting an underground buried pipe 16 via a connector 15 is referred to as a pipe through hole 142. Of the two side walls 13 in which the pipe through hole 142 is formed, one of the side walls 13 also has an attachment through hole 141 formed therein. The attachment through hole 141 is formed closer to the bottom wall 12 than the pipe through hole 142.

[0025] The connector 15 is made of a synthetic resin material and has a cylindrical shape. The connector 15 is fitted into the pipe through hole 142. The underground buried pipe 16 is fitted into the connector 15 fitted into the pipe through hole 142, and the connector 15 and the underground buried pipe 16 are fixed together by a fixing member (not shown).

[0026] The installation path is formed by a plurality of underground buried boxes 11 buried in the ground UG at intervals and underground buried pipes 16 connecting adjacent underground buried boxes 11. The wiring 10 buried in the ground UG is inserted into the installation path buried in the ground UG.

[0027] <Valve mechanism> The valve device 19 is attached to the side wall 13 using the attachment through holes 141 in the ground box 11 .

[0028] 2, 3 and 4, the valve device 19 includes a valve device body 20, an insert body 41, a valve seat portion 51, and a valve body 61. The valve device body 20 is formed by assembling a first member 21 and a second member 31.

[0029] <First component> The first member 21 is disposed on an outer surface 13a side, which is the front surface side of the side wall 13, and the second member 31 is disposed on an inner surface 13b side, which is the back surface side of the side wall 13.

[0030] The first member 21 comprises a cylindrical first main body portion 22, a first flange 24 integral with the first axial end 22a side of the first main body portion 22, a mesh portion 25 integral with the second axial end 22b side of the first main body portion 22, and a first tubular portion 28 extending from the first flange 24.

[0031] A female thread 23 is formed on the inner peripheral surface of the first main body portion 22. The first flange 24 extends from the outer peripheral surface of the first end 22a side of the first main body portion 22 in the radial direction of the first main body portion 22. The first flange 24 has a width in the radial direction of the first main body portion 22. The first main body portion 22 has a plurality of arm portions 25a extending from the inner peripheral surface of the second end 22b side in the radial direction of the first main body portion 22. The mesh portion 25 is supported by the plurality of arm portions 25a. The mesh portion 25 has a plurality of meshes 25b formed therein, which penetrate the mesh portion 25 in the plate thickness direction. The size of the meshes 25b is large enough to prevent foreign matter from passing through.

[0032] The first body portion 22 includes a stopper 22c extending from an inner circumferential surface of the first body portion 22 in a radial direction of the first body portion 22. The stopper 22c is located on the inner circumferential surface of the first body portion 22, closer to the first end 22a than the mesh portion 25 in the axial direction of the first body portion 22, and closer to the second end 22b than the female thread 23.

[0033] The first member 21 includes a foreign object passage prevention material 27 disposed between the mesh portion 25 and the stopper 22c in the axial direction of the first main body portion 22. The foreign object passage prevention material 27 is disk-shaped and made of urethane foam. The foreign object passage prevention material 27 is water permeable and prevents the passage of foreign objects smaller than the meshes 25b of the mesh portion 25.

[0034] The first tubular portion 28 extends cylindrically from the first flange 24 toward the second end 22b of the first main body portion 22. The first tubular portion 28 covers a part of the first main body portion 22 from the outer circumferential surface side of the first main body portion 22. The inner circumferential surface of the first tubular portion 28 is spaced apart from the outer circumferential surface of the first main body portion 22 in the radial direction of the first main body portion 22. Therefore, the outer diameter of the first main body portion 22 is smaller than the outer diameter of the first tubular portion 28.

[0035] The first member 21 may include a plurality of reinforcing ribs 29 that connect the outer peripheral surface of the first main body portion 22 and the inner peripheral surface of the first tubular portion 28. The reinforcing ribs 29 function as finger hooks on which fingers can be hooked when the first member 21 is operated.

[0036] <Second member> The second member 31 comprises a cylindrical second main body portion 32, a second flange 34 integral with the first axial end 32a side of the second main body portion 32, and a second tubular portion 35 extending from the second flange 34.

[0037] A male thread 33 is formed on the outer peripheral surface of the second body part 32. The second body part 32 can be inserted into the attachment through hole 141 of the underground burial box 11. The axial dimension of the second body part 32 is greater than the wall thickness of the side wall 13 of the underground burial box 11, i.e., the depth of the attachment through hole 141. Therefore, when the second body part 32 is inserted into the attachment through hole 141 of the underground burial box 11, the second body part 32 protrudes from the outer surface 13a of the side wall 13.

[0038] A male thread 33 is provided at the tip of the second main body portion 32 protruding from the outer surface 13a of the side wall 13 of the underground burial box 11. The female thread 23 of the first member 21 can be screwed into this male thread 33.

[0039] The second flange 34 extends in the radial direction of the second body portion 32 from the outer peripheral surface of the second body portion 32 on the first end 32a side. The second flange 34 has a width in the radial direction of the second body portion 32. The second tube portion 35 extends from the second flange 34 toward the opposite side to the second body portion 32. The second tube portion 35 is cylindrical. In addition, a plurality of guide grooves 35a are formed at equal intervals on the inner peripheral surface of the second tube portion 35. Each guide groove 35a extends obliquely from the tip end of the second tube portion 35 toward the base end, and then extends in the circumferential direction of the second tube portion 35.

[0040] The second tubular portion 35 includes a plurality of ribs 36 that are integrated with both the second flange 34 and the second tubular portion 35. Each rib 36 protrudes from the outer circumferential surface of the second tubular portion 35 in a thin plate shape, and protrudes from the second flange 34 on the inner side than the periphery of the second flange 34.

[0041] <insert> 3, 4, and 5, the insert 41 is inserted into the inside of the second tubular portion 35 of the second member 31 and is detachable from the second member 31. The insert 41 is cylindrical. The outer diameter of the portion of the insert 41 inserted into the second tubular portion 35 is smaller than the inner diameter of the second tubular portion 35.

[0042] The insert 41 has an insert flange 43 on a first axial end 41a side, and an engagement flange 44 on a second axial end 41b side. The insert 41 also has an annular rib 45 located between the insert flange 43 and the engagement flange 44 in the axial direction of the insert 41. Each of the insert flange 43, the engagement flange 44, and the annular rib 45 extends from the outer circumferential surface of the insert 41 in the radial direction of the insert 41.

[0043] The insert 41 has a plurality of engaging protrusions 42 on its outer circumferential surface. The engaging protrusions 42 are provided between the insert flange 43 and the annular rib 45 in the axial direction of the insert 41. The engaging protrusions 42 are formed at equal intervals in the circumferential direction of the insert 41. The number of the engaging protrusions 42 is the same as the number of the guide grooves 35a formed in the second tubular portion 35. Each engaging protrusion 42 is inserted into the corresponding guide groove 35a. When the engaging protrusion 42 is inserted into the guide groove 35a from the tip side of the second tubular portion 35 and then the insert 41 is rotated, the engaging protrusion 42 is guided by the guide groove 35a toward the base end of the second tubular portion 35. Therefore, when the insert 41 is rotated, the insert 41 can be guided toward the base end of the second tubular portion 35. Furthermore, the engaging protrusion 42 is guided by the guide groove 35a so as to rotate in the circumferential direction of the second tubular portion 35. As a result, the insert 41 is assembled to the second member 31.

[0044] When the insert 41 is rotated in the direction opposite to that when the insert 41 is assembled to the second member 31, the guide groove 35a guides the engaging protrusion 42 to rotate in the circumferential direction of the second cylindrical portion 35. Furthermore, when the insert 41 is rotated in the direction opposite to that when the insert 41 is assembled to the second member 31, the guide groove 35a guides the engaging protrusion 42 from the base end side to the tip end side of the second cylindrical portion 35. Then, the insert 41 can be removed from the second member 31. Therefore, the insert 41 is detachable from the valve device main body 20.

[0045] The insert 41 has an engagement groove 41c defined between the engagement flange 44 and the annular rib 45 in the axial direction of the insert 41. The engagement groove 41c is formed around the entire circumference of the insert 41.

[0046] The insert 41 includes a bridge portion 43a and an annular portion 43b radially inward of the insert flange 43. The bridge portions 43a are formed at 90 degree intervals in the circumferential direction of the insert flange 43. The annular portions 43b are formed concentrically with the insert flange 43. Thus, a plurality of inlet holes 43c are defined by the bridge portion 43a and the annular portion 43b radially inward of the insert flange 43. The inlet holes 43c are arc-shaped and widen from the radial inner side of the insert flange 43 toward the outer side.

[0047] The insert 41 includes a gripping portion 46. The gripping portion 46 extends from the bridge portion 43a along the axial direction of the insert 41. The gripping portion 46 is in the form of a thin plate extending in the diameter direction of the insert flange 43.

[0048] <Valve seat> The valve seat portion 51 is formed of a hydrophobic material. Examples of hydrophobic materials include hydrophobic silicone rubber and hydrophobic fluororubber. In this embodiment, the valve seat portion 51 is made of hydrophobic silicone rubber that is flexible and deformable. Note that hydrophobicity means having a low affinity with water. Also, hydrophobicity means a property that makes it difficult for water to spread thinly on the surface of an object and makes it easy to form droplets. Therefore, by making the valve seat portion 51 hydrophobic, water does not spread thinly on the surface of the valve seat portion 51 and is easy to form droplets.

[0049] 2 and 3, the valve seat portion 51 includes a disk-shaped base portion 52, a peripheral wall 53 protruding from the outer edge of the base portion 52, and a seal portion 54 provided at the tip of the peripheral wall 53. The base portion 52, the peripheral wall 53, and the seal portion 54 are integrally molded.

[0050] The base 52 is disk-shaped. The thickness direction of the base 52 corresponds to the thickness direction of the valve seat 51, and the radial direction of the base 52 corresponds to the radial direction of the valve seat 51. The outer peripheral portion 55 of the base 52 is formed to protrude from one surface in the thickness direction of the base 52 and to be recessed from the other surface. The peripheral wall 53 protrudes from the outer peripheral edge of the outer peripheral portion 55 toward the other surface in the thickness direction of the base 52. The base 52 has a first seating surface 52a on one surface in the thickness direction and a second seating surface 52b on the surface opposite to the first seating surface 52a in the thickness direction, i.e., the other surface.

[0051] The first seating surface 52a is located at a position recessed in the plate thickness direction from the outer peripheral portion 55, and the outer peripheral portion 55 is located at a position recessed in the plate thickness direction from the second seating surface 52b. Therefore, the base 52 has the outer peripheral portion 55 surrounding the first seating surface 52a with the first seating surface 52a on the inside. The second seating surface 52b has a larger area than the first seating surface 52a. In other words, the first seating surface 52a is formed in an area narrower than the second seating surface 52b by the outer peripheral portion 55.

[0052] A shaft insertion hole 52c and a plurality of through holes 52d are formed in the base 52. The shaft insertion hole 52c penetrates the center of the base 52 in the plate thickness direction. The plurality of through holes 52d are arranged at equal intervals in the circumferential direction of the base 52, centered on the shaft insertion hole 52c. Each of the through holes 52d penetrates the base 52 in the plate thickness direction.

[0053] The peripheral wall 53 protrudes cylindrically from the outer periphery of the outer periphery portion 55 toward the second seating surface 52b. The inner diameter of the seal portion 54 of the valve seat portion 51 is slightly smaller than the outer diameter of the outer periphery surface of the insert 41 where the engagement recess 41c is located.

[0054] An insertion groove 56 is defined in the valve seat 51 radially outwardly of the base 52 and radially inwardly of the peripheral wall 53. The insertion groove 56 is defined on the radial outer circumferential side of the valve seat 51 at the base 52 and on the inner circumferential side of the peripheral wall 53. Therefore, the insertion groove 56 is defined on the side of the valve seat 51 where the peripheral wall 53 is erected.

[0055] The seal portion 54 protrudes inward from the inner circumferential surface of the peripheral wall 53 in the radial direction of the valve seat portion 51, and protrudes outward from the outer circumferential surface of the peripheral wall 53. For this reason, the dimension of the seal portion 54 in the radial direction of the valve seat portion 51 is larger than the dimension of the peripheral wall 53 in the radial direction of the valve seat portion 51.

[0056] <Valve body> The valve body 61 is formed of a hydrophobic material, similar to the valve seat portion 51. The valve body 61 is made of hydrophobic silicone rubber. The valve body 61 includes a shaft portion 63 attached to the base portion 52, and a disk-shaped tongue portion 62 extending from the shaft portion 63 and elastically deformable between a state in which the valve body 61 is seated on the seating surface and a state in which the valve body 61 is spaced from the seating surface. Thus, the valve body 61 is seated on the valve seat portion 51. In detail, the valve seat portion 51 includes the base portion 52 on which the valve body 61 is seated.

[0057] The valve tongue portion 62 is thin plate-like and elastically deformable. The outer diameter of the valve tongue portion 62 is smaller than the inner diameter of the second cylindrical portion 35 of the second member 31. Therefore, the valve body 61 is formed smaller than the internal space of the second cylindrical portion 35 of the second member 31. In addition, the outer diameter of the valve body 61 is smaller than both the first seating surface 52a and the second seating surface 52b of the valve seat portion 51.

[0058] When the shaft portion 63 is inserted from the first seating surface 52a to the second seating surface 52b of the valve seat portion 51, the valve portion 62a can be seated on the first seating surface 52a. When the shaft portion 63 is inserted from the second seating surface 52b to the first seating surface 52a of the valve seat portion 51, the valve portion 62a can be seated on the second seating surface 52b. Therefore, the valve tongue portion 62 can be seated on both the first seating surface 52a and the second seating surface 52b. Therefore, the base portion 52 can support the valve body 61 regardless of whether the valve tongue portion 62 is disposed on either of the two sides of the base portion 52 in the plate thickness direction.

[0059] The valve tongue portion 62 has a valve portion 62a on the outer periphery in the radial direction. The valve portion 62a is a portion having a greater thickness than the portions of the valve tongue portion 62 other than the valve portion 62a. The valve portion 62a protrudes in the thickness direction of the valve tongue portion 62 toward the protruding side of the shaft portion 63. The valve portion 62a can be seated on the first seating surface 52a or the second seating surface 52b. The tip portion of the shaft portion 63 has a larger diameter than the base end portion. The valve portion 62a has a dimension in the radial direction.

[0060] The valve seat 51 and the valve body 61 are each made of hydrophobic silicone rubber, which is a hydrophobic material. Therefore, the valve portion 62a seated on each seating surface 52a, 52b of the tongue portion 62 is also hydrophobic, and the portion of the base 52 on which the valve portion 62a is seated is also hydrophobic.

[0061] <Overall valve device body> The valve device main body 20 is formed by screwing together the first member 21 and the second member 31. Specifically, the second body portion 32 of the second member 31 is inserted into the inside of the first body portion 22 of the first member 21, and the male thread 33 of the second member 31 is screwed into the female thread 23 of the first body portion 22. In this way, the first member 21 and the second member 31 are screwed together to form the valve device main body 20. In the screwed state of the first member 21 and the second member 31, the central axis of the first member 21 and the central axis of the second member 31 are positioned on the same straight line. Therefore, in the valve device main body 20, the axial direction of the first member 21 and the axial direction of the second member 31 are the same. The direction that coincides with the axial directions of the first member 21 and the second member 31 is defined as the axial direction of the valve device main body 20.

[0062] In the first member 21 and the second member 31 which are screwed together, the first flange 24 of the first member 21 and the second flange 34 of the second member 31 face each other in the axial direction of the valve device body 20. The distance between the first flange 24 and the second flange 34 in the axial direction of the valve device body 20 becomes narrower due to the relative forward screwing of the female thread 23 and the male thread 33, and becomes wider due to the relative retraction of the female thread 23 and the male thread 33.

[0063] A surface packing 72 may be disposed between the first flange 24 and the second flange 34. The surface packing 72 is in the shape of a rubber ring. The radial width of the surface packing 72 is the same as the radial width of the first flange 24 and the second flange 34, but may be different.

[0064] In the valve device main body 20, the second cylindrical portion 35 opens at one axial end of the valve device main body 20, thereby forming a water inlet 20a. In addition, in the valve device main body 20, the first main body portion 22 opens at the other axial end of the valve device main body 20, thereby forming a water outlet 20b. Note that, since the other axial end of the valve device main body 20 opens through the mesh 25b of the mesh portion 25, the mesh 25b also serves as the outlet 20b.

[0065] In addition, in a state where the male thread 33 of the second main body portion 32 and the female thread 23 of the first main body portion 22 are screwed together, a flow passage R is defined inside the valve device main body 20 in which the first member 21 and the second member 31 are integrated. The flow passage R is defined by communicating the internal space of the second cylindrical portion 35 of the second member 31 and the internal space of the second main body portion 32 with the internal space at the tip of the first main body portion 22 of the first member 21. The flow passage R connects the inlet 20a of the second cylindrical portion 35 with the outlet 20b of the first main body portion 22. In addition, in the flow passage R, the through hole 52d connects the inlet 20a with the outlet 20b. Therefore, the valve device main body 20 defines the flow passage R that connects the inlet 20a with the outlet 20b.

[0066] <Insertion Part> The insert 41 , the valve seat 51 and the valve body 61 are assembled together to form an insert member 71 .

[0067] The shaft portion 63 of the valve body 61 is inserted into the shaft insertion hole 52c of the valve seat portion 51. The base portion 52 is sandwiched between the valve tongue portion 62 and the tip side of the shaft portion 63. In this way, the valve body 61 is attached to the base portion 52.

[0068] In the insert member 71, the engaging flange 44 side of the insert body 41 is inserted into the inside of the peripheral wall 53 of the valve seat portion 51. The engaging flange 44 is inserted into the insertion groove portion 56 of the valve seat portion 51. The engaging flange 44 is sandwiched between the inner peripheral surface of the peripheral wall 53 in the radial direction of the valve seat portion 51 and the outer peripheral edge of the base portion 52. Therefore, in the base portion 52, on the side where the peripheral wall 53 is erected in the plate thickness direction, the insertion groove portion 56 is defined, which sandwiches the engaging flange 44 as the insertion end portion of the insert body 41 from the inside and outside in the radial direction of the insert body 41. Then, the insert body 41 is assembled integrally with the valve seat portion 51, and the valve body 61 attached to the valve seat portion 51 is also assembled integrally with the insert body 41. In this way, the insert member 71 is formed.

[0069] As described above, the inner diameter of the seal portion 54 of the valve seat portion 51 is slightly smaller than the outer diameter of the outer peripheral surface of the insert body 41 where the engagement groove 41c is located. Therefore, the inner peripheral edge of the seal portion 54 is in close contact with the outer peripheral surface of the insert body 41. The seal portion 54 fits into the engagement groove 41c of the insert body 41. The seal portion 54 can engage with the engagement flange 44 that defines the engagement groove 41c.

[0070] <Valve device and valve structure> The insert member 71 is integrated with the valve device main body 20. The insert member 71 is inserted into the second cylindrical portion 35 of the second member 31 from the valve body 61 side, and the insert body 41 is inserted into the second member 31. Since the inside of the second cylindrical portion 35 defines the inlet 20a as described above, the insert body 41 holding the valve seat portion 51 and the valve body 61 is inserted into the inlet 20a of the inlet 20a and the outlet 20b of the valve device main body 20. Since the insert body 41 holds the valve seat portion 51 as described above, the insert body 41 is inserted into the inlet 20a while holding the valve seat portion 51. Then, with the insertion of the insert body 41 into the inlet 20a, the base portion 52 of the valve seat portion 51 covers the inlet 20a, and the peripheral wall 53 is fitted onto the insert body 41.

[0071] When the insert member 71 is integrated with the valve device main body 20, the engaging protrusion 42 is inserted into the guide groove 35a and the insert body 41 is assembled to the second member 31. Then, the insert member 71 is integrated with the valve device main body 20, and the first member 21, the second member 31, the insert body 41, the valve seat portion 51, and the valve body 61 are integrated together to form the valve device 19 and the valve structure.

[0072] In the valve device 19 and the valve structure, the outer peripheral edge of the seal portion 54 protrudes radially outward from the outer peripheral edge of the annular rib 45. The outer peripheral edge of the seal portion 54 is in close contact with the inner peripheral surface of the second cylindrical portion 35. Therefore, the seal portion 54 provides a seal between the insert 41 and the second cylindrical portion 35, i.e., between the inner surface of the valve device body 20 and the outer surface of the insert 41.

[0073] Furthermore, the gripping portion 46 of the insert 41 protrudes in the axial direction on the second member 31 side of the valve device body 20. Thus, the insert 41 has the gripping portion 46 protruding outward from the valve device body 20 on the side opposite to the side where it is inserted into the valve device body 20. Furthermore, the valve device 19 and the valve structure have a foreign object passage prevention material 27 arranged upstream of the mesh portion 25 in the water flow direction.

[0074] In the valve device body 20, the inlet 20a defined inside the second member 31 communicates with the outside of the valve device body 20 via the inlet hole 43c of the insert 41. In the valve device 19 and the valve structure, the valve body 61 and the base 52 of the valve seat 51 are disposed midway through the flow passage R.

[0075] In the valve device 19 and the valve structure, the inlet 20a side is the upstream side and the outlet 20b side is the downstream side in the flow direction of water in the flow passage R. In addition, the through hole 52d formed in the base 52 of the valve seat 51 penetrates the base 52 in the flow direction of the flow passage R.

[0076] In the valve device 19 and valve structure of this embodiment, the base 52 separates the inlet 20a and the outlet 20b. The valve portion 62a of the valve body 61 is seated on the first seating surface 52a of the base 52. The seating of the valve portion 62a on the base 52 causes the valve body 61 to close the through hole 52d. Therefore, when the valve portion 62a is seated on the base 52, the inlet 20a and the outlet 20b are blocked by the valve seat portion 51 and the valve body 61.

[0077] When the insertion member 71 is rotated in the opposite direction to the direction in which the insertion member 71 is assembled to the second member 31, the guide groove 35a guides the engagement protrusion 42 to rotate in the circumferential direction of the second cylindrical portion 35. At this time, it is preferable to hold the grip portion 46 integral with the insertion body 41 and operate it.

[0078] Furthermore, when the insertion member 71 is rotated in the direction opposite to that when the insertion member 71 is assembled to the second member 31, the engaging protrusion 42 is guided by the guide groove 35a from the base end side to the tip end side of the second cylindrical portion 35. Then, the insertion member 71 can be removed from the second member 31. Therefore, the insertion member 71, and therefore the insert 41, are inserted into the inlet 20a and are detachable from the valve device main body 20.

[0079] <Installation of valve equipment and valve structure> A method of attaching the valve device body 20 to the underground buried box 11 and installing the check valve in the underground buried box 11 will be described. Note that the valve device body 20 is assumed to be disassembled into the first member 21 and the second member 31, and the insertion member 71 is assumed to be not assembled to the valve device body 20.

[0080] First, the attachment through hole 141 is formed in the side wall 13 of the underground burial box 11. The hole diameter of the attachment through hole 141 is set to a size that allows the second main body portion 32 to be inserted therethrough. Next, with the surface packing 72 attached to the second body portion 32, the second body portion 32 is inserted into the attachment through-hole 141 from the space S side of the underground burial box 11. The second body portion 32 penetrates the side wall 13, and the male thread 33 protrudes from the outer surface 13a of the side wall 13.

[0081] Next, the female thread 23 of the first body portion 22 is screwed into the male thread 33 of the second body portion 32. It is preferable for the worker to perform the screwing work by hooking his / her fingers on the reinforcing rib 29 of the first member 21. Then, the side wall 13 is sandwiched between the first flange 24 and the second flange 34. The surface packing 72 is sandwiched between the side wall 13 and the second flange 34 and comes into close contact with the inner surface 13b of the side wall 13.

[0082] As a result, the valve device body 20 is attached to the side wall 13 of the underground burial box 11 using the attachment through hole 141. After that, the engagement protrusion 42 of the insert member 71 is inserted into the guide groove 35a of the second member 31 to assemble the insert body 41 to the second member 31, thereby integrating the insert member 71 with the valve device body 20. At this time, the gripping portion 46 of the insert body 41 is gripped to rotate the insert body 41 and the insert member 71. Therefore, the first member 21, the second member 31, the insert body 41, the valve seat portion 51, and the valve body 61 are integrated, and the check valve is installed in the underground burial box 11. In other words, the valve device 19 is installed in the underground burial box 11, and the valve structure is formed. When removing the insert body 41 from the valve device body 20, the worker also grips the gripping portion 46 to rotate the insert body 41 and the insert member 71.

[0083] When the valve device 19 is installed in the underground buried box 11, a flow passage R extending horizontally is formed in the underground buried box 11. An inlet 20a of the flow passage R opens into the space S of the underground buried box 11, and an outlet 20b opens outside the underground buried box 11. Water in the space S of the underground buried box 11 can flow into the inside of the valve device main body 20 from the inlet 20a.

[0084] <Valve structure and valve device action> 6, in a usage state of the valve device 19 and the valve structure, when water flows into the inlet 20a via the inlet hole 43c and reaches the valve tongue portion 62 via the through hole 52d, water pressure acts on the valve tongue portion 62. Therefore, the base portion 52 of the valve seat portion 51 is formed with the through hole 52d penetrating in the flow direction of the water in the flow passage R.

[0085] When the water pressure acting on the valve tongue portion 62 exceeds a threshold value, the valve tongue portion 62 deforms and the valve portion 62a separates from the first seating surface 52a. Therefore, in the valve structure and valve device 19, the valve body 61 separates from the valve seat portion 51 when water pressure is applied from the inlet 20a side to the outlet 20b side, thereby allowing the flow of water. As a result, the inlet 20a and the outlet 20b communicate with each other via the through hole 52d, and the water that has flowed into the inlet 20a flows out to the outlet 20b via the flow passage R. The water that has flowed out to the outlet 20b passes through the foreign matter passage prevention material 27 and then flows out to the outside of the valve device body 20 via the mesh 25b of the mesh portion 25.

[0086] In addition, in a usage mode of the valve device 19 and the valve structure, as shown by an arrow F in Fig. 3, when water flows into the outlet 20b through the mesh 25b of the mesh portion 25 and reaches the valve tongue portion 62, water pressure acts on the valve tongue portion 62. The water pressure acting on the valve tongue portion 62 presses the valve portion 62a against the first seating surface 52a. Therefore, in the valve structure and the valve device 19, the seating of the valve body 61 on the valve seat portion 51 prevents water from flowing from the outlet 20b side to the inlet 20a side, that is, prevents water from flowing back from the outlet 20b side to the inlet 20a side.

[0087] In the valve device 19 and the valve structure, the base 52 and the valve body 61 are each made of hydrophobic silicone rubber that can be deformed. Therefore, at the location where the valve portion 62a is seated on the first seating surface 52a, water is less likely to spread thinly and is more likely to form droplets. Therefore, water is more likely to be removed from the location where the valve portion 62a is seated on the first seating surface 52a. In addition, a force that separates the first seating surface 52a and the valve portion 62a is less likely to be generated due to water entering between the first seating surface 52a and the valve portion 62a. As a result, the seating state of the valve portion 62a on the first seating surface 52a is more likely to be maintained.

[0088] According to the above embodiment, the following effects can be obtained. (1) The valve body 61 and the valve seat 51 are each made of hydrophobic silicone rubber. This makes it easier for water to be expelled from the portion where the valve portion 62a is seated on the first seating surface 52a. As a result, the valve portion 62a can be kept seated on the first seating surface 52a, preventing water from flowing back from the outlet 20b to the inlet 20a.

[0089] (2) Backflow of water can be prevented by forming each of the valve body 61 and the valve seat 51 from hydrophobic silicone rubber. For example, the structure of the valve device 19 can be simplified compared to a case in which a biasing member such as a spring is used in the valve device 19 to prevent backflow.

[0090] (3) The entire valve seat 51 and the entire valve body 61 are made of hydrophobic silicone rubber. Therefore, the valve seat 51 and the valve body 61 can be easily manufactured. (4) The valve seat portion 51 is held by the insert body 41. Then, the insert body 41 is inserted into the inlet 20a of the second cylindrical portion 35 while holding the valve seat portion 51. As a result, the valve seat portion 51 is disposed in the valve device main body 20. Therefore, the valve seat portion 51 can be easily disposed inside the valve device main body 20. Furthermore, when the valve body 61 is attached to the valve seat portion 51, the valve body 61 is also held by the insert body 41 in addition to the valve seat portion 51. Therefore, by inserting the insert body 41 into the valve device main body 20, the valve body 61 can also be easily disposed.

[0091] (5) The valve seat portion 51 includes a peripheral wall 53 in addition to the base portion 52 that forms the first seating surface 52a and the second seating surface 52b. The peripheral wall 53 is fitted onto the engaging flange 44 side of the insert body 41. Therefore, by providing the peripheral wall 53 on the valve seat portion 51, the valve seat portion 51 can be easily held on the insert body 41.

[0092] (6) An insertion groove 56 for clamping the engaging flange 44 is formed on the side of the base 52 where the peripheral wall 53 is erected. When the engaging flange 44 is clamped in the insertion groove 56, twisting of the base 52 can be suppressed, and the base 52 is held in a stable state in the insert 41.

[0093] (7) The base 52 has a first seating surface 52a on one side in the plate thickness direction and a second seating surface 52b on the other side. The valve portion 62a of the valve body 61 can seat on either the first seating surface 52a or the second seating surface 52b. Therefore, the direction in which the backflow is prevented can be reversed by simply changing the attachment direction of the valve body 61 to the base 52, without changing the insertion direction of the insertion body 41 into the second member 31. This makes it easy to switch the mode of use of the valve device 19.

[0094] (8) The insert 41 is detachable from the second cylindrical portion 35 of the second member 31. Therefore, by removing the insert 41 from the second member 31, maintenance of the valve seat portion 51 and the valve body 61 can be easily performed.

[0095] (9) The valve seat portion 51 is integrally provided with the seal portion 54. Therefore, when the valve seat portion 51 is integrated with the insert body 41, the seal portion 54 is also integrated with the insert body 41. Then, when the insert body 41 is inserted into the second cylindrical portion 35 of the second member 31 and the valve seat portion 51 and the valve body 61 are disposed inside the valve device body 20, the seal portion 54 can seal between the valve device body 20 and the insert body 41. This makes it possible to eliminate the case where the seal portion 54 is left unattended.

[0096] (10) The insert 41 is integrally provided with a grip portion 46. When the insert 41 is inserted into the second member 31, the grip portion 46 protrudes outward from the valve device body 20. Therefore, when removing the insert 41 from the valve device body 20, the grip portion 46 can be gripped, making it easy to remove the insert 41 from the valve device body 20.

[0097] (11) The base 52 includes an outer peripheral portion 55 that surrounds the first seating surface 52a with the first seating surface 52a on the inside. The base 52 is formed such that the first seating surface 52a is recessed toward the opposite side to the direction in which the tongue portion 62 is separated from the first seating surface 52a, relative to the outer surface of the outer peripheral portion 55 in the flow direction of water through the flow passage R. Therefore, a step is formed around the base 52. This step determines the boundary of the bending deformation of the base 52, and therefore excessive bending deformation of the base 52 is suppressed.

[0098] (12) The outlet 20b is formed by the mesh 25b of the mesh portion 25 in the first member 21. Further, a foreign matter passage prevention material 27 is disposed upstream of the mesh 25b in the water flow direction. Therefore, the mesh 25b and the foreign matter passage prevention material 27 can prevent foreign matter from entering the valve device body 20.

[0099] (13) The valve device 19 is installed in the underground burial box 11 so that the flow passage R extends horizontally. Therefore, when water is drained from the portion where the valve portion 62a is seated on the first seating surface 52a, the water falls vertically, making it easier to drain. As a result, the valve portion 62a can be kept seated on the first seating surface 52a, preventing backflow of water from the outlet 20b to the inlet 20a.

[0100] This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction. The mesh portion 25 and the mesh 25b of the first member 21 may be omitted. Furthermore, the foreign object passage prevention material 27 may also be omitted. In this case, the outlet 20b opens to the inside of the first main body portion 22 of the first member 21. Then, the insert 41 holding the valve seat portion 51 may be inserted into the outlet 20b.

[0101] The stopper 22c of the first member 21 and the foreign object passage prevention member 27 may be omitted. In this case, the mesh 25b of the mesh portion 25 prevents the intrusion of foreign objects. The base 52 does not have to include the outer circumferential portion 55. In this case, the peripheral wall 53 and the seal portion 54 are also separate from the base 52. In such a configuration, it is preferable that the valve device body 20 and the insert 41 are sealed by a seal member separate from the base 52.

[0102] The base portion 52 may be a flat plate without a recess formed by the outer periphery 55 . The grip portion 46 of the insert 41 may be omitted. The base 52 may have a seating surface on only one side, rather than having both the first seating surface 52a and the second seating surface 52b. In this case, the valve body 61 is attached to the base 52 so that the valve portion 62a seats on the seating surface.

[0103] Only the base portion 52 of the valve seat portion 51 may be made of a hydrophobic material. The valve seat 51 may be formed by applying a hydrophobic paint to both sides of the base 52 in the plate thickness direction.

[0104] Only the tongue portion 62 of the valve body 61 may be made of a hydrophobic material. The valve body 61 may be formed by coating the valve portion 62a of the valve tongue portion 62 with a hydrophobic material.

[0105] The valve seat 51 and the valve body 61 may be made of different hydrophobic materials. The valve device 19 may be attached to an underground box 11 made of concrete. The valve device main body 20 is formed as an integrated unit by screwing the first member 21 and the second member 31 together, but the valve device main body 20 may also be integrated so that the first member 21 and the second member 31 cannot be separated.

[0106] The valve device 19 may be attached to a drain pipe, a water supply pipe, etc. In this case, the inlet 20a and / or the outlet 20b of the valve device body 20 may be provided with a connection portion to which a fluid pipe such as a drain pipe or a water supply pipe can be connected.

[0107] When installing the valve device 19 in the underground burial box 11 , the insertion member 71 may be assembled to the valve device body 20 . In the embodiment, the valve device 19 is installed on the side wall 13 of the underground burial box 11, but it may be installed on the bottom wall 12 of the underground burial box 11. Since the valve body 61 and the valve seat 51 are each made of a hydrophobic material, when the flow passage R is oriented in a direction different from the vertical direction, specifically, in the horizontal direction, water is easily discharged from the portion where the valve portion 62a is seated on the first seating surface 52a. However, the valve device 19 can also be used so that the flow passage R extends in the vertical direction.

[0108] Although the valve device 19 is installed in the underground buried box 11, it may be installed somewhere along the installation path, for example, in the underground buried pipe 16. [Explanation of symbols]

[0109] R...flow passage, 19...valve device, 20...valve device main body, 20a...flow inlet, 20b...flow outlet, 25...mesh portion, 27...foreign object passage prevention material, 41...insertion body, 44...engagement flange as insertion end, 46...gripping portion, 51...valve seat portion, 52...base portion, 52a...first seating surface, 52b...second seating surface, 52d...through hole, 53...periphery, 54...sealing portion, 55...outer periphery, 56...insertion groove portion, 61...valve body, 62...valve tongue portion, 62a...valve portion, 63...shaft portion.

Claims

1. The valve body is disposed in a flow passage connecting a water inlet and a water outlet, and a valve seat portion on which the valve body is seated, A valve structure in which the valve body is separated from the valve seat portion when a water pressure of the water flows from the inlet side to the outlet side, thereby allowing the water to flow, and the valve body is seated on the valve seat portion to prevent a backflow of the water from the outlet side to the inlet side, The valve seat portion includes a base portion that forms a seating surface of the valve body, The base portion is formed with a through hole penetrating in a flow direction of the water in the flow passage, The valve body includes a shaft portion attached to the base portion and a tongue portion extending from the shaft portion and elastically deformable between a state in which the tongue portion is seated on the seating surface and a state in which the tongue portion is spaced from the seating surface; A valve structure, characterized in that a valve portion that seats on the seating surface of the valve tongue portion and a portion of the base portion on which the valve portion seats are hydrophobic.

2. The valve structure according to claim 1 , wherein the valve body and the base are each formed from a hydrophobic material.

3. a valve device body defining a flow passage connecting a water inlet and a water outlet; a valve body disposed midway through the flow passage; a valve seat portion on which the valve body is seated, a valve device in which the valve body is separated from the valve seat portion by receiving water pressure from the water inlet side to the water outlet side, thereby allowing the water to flow, and the valve body is seated on the valve seat portion to prevent the water from flowing back from the water outlet side to the water inlet side, The valve seat portion includes a base portion that forms a seating surface of the valve body, The base portion is formed with a through hole penetrating in a flow direction of the water in the flow passage, The valve body includes a shaft portion attached to the base portion and a tongue portion extending from the shaft portion and elastically deformable between a state in which the tongue portion is seated on the seating surface and a state in which the tongue portion is spaced from the seating surface; A valve device, characterized in that a valve portion that seats on the seating surface of the valve tongue portion and a portion of the base portion on which the valve portion seats are hydrophobic.

4. a cylindrical insert that is inserted into either the inlet or the outlet of the valve device body, The valve seat is held by the insert; The valve device according to claim 3 , wherein the insert is inserted into either the inlet or the outlet while holding the valve seat portion.

5. The valve device according to claim 4 , wherein the valve seat portion includes a peripheral wall extending from an outer edge of the base portion, the peripheral wall being fitted onto the insert.

6. The valve device according to claim 5, wherein an insertion groove portion is defined on the side of the valve seat portion where the peripheral wall is erected, the insertion groove portion clamping an insertion end portion of the insert into either the inlet or the outlet from inside and outside in the radial direction of the insert.

7. The insert is detachably attached to the valve device body, The valve seat is made of a hydrophobic material, which is a flexible rubber.

7. The valve device according to claim 5, wherein a seal portion for sealing between an outer surface of the insert and an inner surface of the valve device body is integrally formed with the peripheral wall.

8. The valve device according to any one of claims 4 to 6, wherein the insert is provided with a grip portion protruding outward from the valve device body on a side opposite to the side where the insert is inserted into the valve device body.

9. The valve body is formed smaller than an internal space of either the inlet or the outlet, The valve device according to any one of claims 3 to 6, wherein the base is capable of supporting the valve body regardless of whether the valve tongue portion is disposed on either side of the two faces of the base in the plate thickness direction.

10. The base portion includes an outer periphery surrounding the seating surface with the seating surface on the inside, The valve device according to any one of claims 3 to 6, wherein in the flow direction of the water in the flow passage, the seating surface is recessed toward the opposite side to the direction in which the valve tongue portion is separated from the seating surface, relative to the outer circumferential portion.

11. The valve device body is provided with a mesh portion on the outlet side that suppresses the passage of foreign matter, and the valve device is provided with a foreign matter passage prevention material upstream of the mesh portion in the water flow direction. The valve device is described in any one of claims 3 to 6.

Images