Joint

Abstract

To suppress water leakage after connection of piping due to intrusion of a foreign matter between a first water stopping material and the piping at the time of connecting the piping.SOLUTION: A joint includes: a cylindrical body part including a first groove formed at a cylindrical outer peripheral surface and a second groove formed on one side in an axial direction from the first groove; a cover part provided so as to cover the first and second grooves of the body part and holding a cylindrical body inserted from one end side of the body part between an inner peripheral surface and the outer peripheral surface of the body part; a first water stopping material having an annular shape and disposed in the first groove; and a second water stopping material having a cylindrical shape, disposed in the second groove, and having an axial length that is longer than a sectional diameter of the first water stopping material.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a fitting. [Background technology]

[0002] The pipe fitting described in Patent Document 1 has a groove formed in the outer peripheral surface of the guide tube, and multiple gaskets that fit tightly against the inner peripheral surface of the connecting tube are attached to the groove.When the connecting tube is fitted onto the guide tube, the connecting tube is clamped between the guide tube and the ring and connected to the fitting body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-83485 A Summary of the Invention [Problem to be solved by the invention]

[0004] The pipe is connected to the joint so that the inner peripheral surface of the pipe is in contact with the outer peripheral surface of the first water-stopping material in the joint. If foreign matter such as hair or pipe cutting debris gets between the outer peripheral surface of the first water-stopping material and the inner peripheral surface of the pipe when the pipe is connected to the joint, water may leak from the joint when water flows through the pipe after it is connected.

[0005] An object of the present disclosure is to suppress water leakage after the pipes are connected, which is caused by foreign matter entering between a first waterstop material and the pipes when the pipes are connected. [Means for solving the problem]

[0006] The fitting of the first aspect comprises a cylindrical main body having a first groove formed on its cylindrical outer peripheral surface and a second groove formed closer to one end in the axial direction than the first groove, a cover portion provided to cover the first and second grooves of the main body and sandwiching a cylindrical body inserted from one end side of the main body between its inner peripheral surface and the outer peripheral surface of the main body, a first water-stopping material which is annular and disposed in the first groove, and a second water-stopping material which is cylindrical and disposed in the second groove and has an axial length longer than a cross-sectional diameter of the first water-stopping material.

[0007] According to the fitting of the first aspect, the axial length of the second water-stopping material is longer than that of the first water-stopping material, and the second water-stopping material is formed closer to one end than the first water-stopping material, thereby making it possible to suppress water leakage after the piping is connected due to foreign matter getting between the first water-stopping material and the piping when the piping is connected.

[0008] A joint according to a second aspect is the joint according to the first aspect, wherein the second water-stopping material has a property of expanding by absorbing water.

[0009] According to the joint of the second aspect, the second water-stopping material expands only when it absorbs water, so that deterioration of workability can be suppressed compared to a configuration in which the second water-stopping material always protrudes from the second groove.

[0010] A joint according to a third aspect is the joint according to the second aspect, wherein the second water-stopping material has a thickness in a non-water-absorbed state that is equal to or smaller than the depth of the second groove of the main body portion.

[0011] According to the joint of the third aspect, deterioration of workability can be further suppressed, compared to a configuration in which the second water-stopping material protrudes from the second groove.

[0012] A joint according to a fourth aspect is a joint according to any one of the first to third aspects, wherein the second groove of the main body has an inner end portion at an inner end position on the other end side in the axial direction, and the main body has a partition portion between the first groove and the second groove, the partition portion expanding in diameter from the inner end position toward the first groove.

[0013] According to the joint of the fourth aspect, the seating of the first waterstop material and the second waterstop material can be improved compared to a configuration in which there is no partition between the first waterstop material and the second waterstop material.

[0014] A joint according to a fifth aspect is a joint according to any one of the first to fourth aspects, wherein the main body portion has a tapered portion provided at one end in the axial direction, the tapered portion reducing an inner diameter from the one end toward the other end in the axial direction to a reduced diameter position, and the second groove of the main body portion has an outer end portion provided at the reduced diameter position on the one end side in the axial direction.

[0015] According to the joint of the fifth aspect, the strength of the main body can be maintained even when the second waterstop material is provided, compared to a configuration in which the second waterstop material is provided closer to one axial end side than the diameter-reduced position. Effect of the Invention

[0016] According to the present disclosure, it is possible to suppress water leakage after the pipes are connected, which is caused by foreign matter entering between the first waterstop material and the pipes when the pipes are connected. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a side view, in partial section, of a fitting according to an embodiment of the present disclosure. [Diagram 2] 1 is a side view showing a state in which a joint according to an embodiment of the present disclosure is attached to an end of a pipe 10, with a portion shown in cross section. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An example of a joint according to an embodiment of the present disclosure will be described with reference to Fig. 1. As shown in Fig. 1, a joint 20 according to this embodiment is a so-called one-touch joint, and is attached to an end of a pipe 10 made of, for example, synthetic resin.

[0019] The joint 20 includes a tubular main body 22 and a tubular intermediate portion 24 that is fitted onto the main body 22. The main body 22 and the intermediate portion 24 are integrated to form a joint body 26. The tube and the intermediate portion 24 are examples of a cylinder and a cover portion, respectively.

[0020] The hole penetrating the axial core portion C of the main body portion 22 in the axial direction is a flow path 27 through which a fluid passes. An inner cylindrical portion 22A having a smaller diameter than the rear end side is formed on the front end side (the side where the piping 10 is inserted) of the main body portion 22. The inner cylindrical portion 22A is disposed on the inner circumferential side of the intermediate portion 24. A tapered portion 64 having a tapered shape in which the inner diameter is reduced from the front end to the rear end side to a reduced diameter position 66 is formed on the surface of the main body portion 22 opposite to the surface on which the inner cylindrical portion 22A is formed. The reduced diameter position 66 is provided at a predetermined section from the end portion on which the tapered portion 64 is formed. Furthermore, the joint 20 is provided with a tubular sleeve 28. The sleeve 28 is fitted onto the intermediate portion 24. The intermediate portion 24 is provided so as to cover a circumferential groove 22B and a long groove 60 described later.

[0021] An insertion hole 30 into which the piping 10 is inserted is formed between the intermediate portion 24 and the sleeve 28 and the inner cylindrical portion 22A. The piping 10 is an example of a cylindrical body. The inner diameter of the insertion hole 30, i.e., the outer diameter of the inner cylindrical portion 22A, is approximately the same as or slightly smaller than the inner diameter of the piping 10. The outer diameter of the insertion hole 30, i.e., the inner diameter of the intermediate portion 24, is approximately the same as or slightly larger than the outer diameter of the piping 10.

[0022] A lock ring 40 is disposed inside the sleeve 28 as a retaining portion for retaining the pipe 10 in the insertion hole 30. The lock ring 40 is generally annular, and its cross section is substantially V-shaped rotated 90 degrees. The lock ring 40 is disposed so that the opening of the substantially V-shape faces the inner side of the joint body 26 (the side opposite to the insertion side of the pipe 10). The opening of the lock ring 40 faces the tip portion 24A of the intermediate portion 24, and a part of the inner surface of the substantially V-shape abuts against the tip portion 24A. A claw portion 42 is formed at the V-shaped tip disposed radially inward of the lock ring 40. The tip portion of the claw portion 42 is sharp, and has a shape that easily bites into the pipe 10.

[0023] A tapered surface 28A is formed on the inner wall of the sleeve 28, against which the substantially V-shaped outer surface of the lock ring 40 can abut. The tapered surface 28A is formed so as to decrease in diameter toward the entrance 30A of the insertion hole 30.

[0024] A release ring 32 that is movable along the axial direction of the joint 20 is inserted into the inner periphery of the sleeve 28, closer to the entrance 30A of the insertion hole 30 than the lock ring 40. This release ring 32 is generally cylindrical, and its inner wall forms part of the insertion hole 30. A protrusion 32A is formed in the circumferential direction on the outer periphery at the rear side of the release ring 32, which abuts against a small diameter portion 28B formed on the inner periphery of the sleeve 28, thereby preventing the release ring 32 from coming off the sleeve 28.

[0025] The tip 32B of the projection 32A is tapered and is disposed along the radially inner outer peripheral surface of the lock ring 40. The main body 22 has two circumferential grooves 22B formed on the outer peripheral surface facing the insertion hole 30, and a rubber O-ring 34 is fitted into each of the circumferential grooves 22B. The circumferential grooves 22B and the O-rings are examples of a first groove and a first water-stopping material, respectively. The main body 22 also has a long groove 60 and a partition portion 68, which will be described later. The long groove 60 is an example of a second groove.

[0026] A wall surface 23 with an expanded outer diameter is formed at the innermost part of the insertion hole 30, on the inner side of the circumferential groove 22B of the main body 22. The tip of the pipe 10 abuts against this wall surface 23, and the wall surface 23 serves as a stopper for the pipe 10. Furthermore, on the opposite side of the insertion hole 30 of the main body 22, a cylindrical male connection part 22C is formed, which is connected to a female screw 46 formed on a connection object 44 made of a metal material. Furthermore, in the axial middle part of the main body 22, on the insertion hole 30 side of the male connection part 22C, a hexagonal nut part 22D that can be engaged with a wrench or the like is formed.

[0027] The female thread 46 formed in the connection object 44 is, for example, a tapered female thread conforming to the tapered female pipe thread described in JIS B 0203.

[0028] A tip member 48 made of a metal material such as brass or stainless steel is attached to the outer periphery of male connection portion 22C on the tip side opposite insertion hole 30. This tip member 48 is bonded integrally with the resin material when main body 22 is molded.

[0029] As an example, a first tapered male thread 50A is formed on the outer circumferential surface of the male connection portion 22C. A second tapered male thread 50B is also formed on the outer circumferential portion of the tip member 48. The threads of the first tapered male thread 50A and the threads of the second tapered male thread 50B are continuous. Hereinafter, the first tapered male thread 50A and the second tapered male thread 50B are collectively referred to as the tapered male thread 50. The tapered male thread 50 is formed in accordance with the tapered male thread for pipes described in JIS B 0203.

[0030] The inner diameter of tip member 48 is larger than the inner diameter of male side connection portion 22C (the diameter of flow path 27), and end face 48A of tip member 48 on the right side of the drawing is parallel to the radial direction of male side connection portion 22C, and the radial outer end of the end face is exposed to the outer periphery of male side connection portion 22C.

[0031] Meanwhile, inner circumferential surface 48B of tip member 48 is parallel to the axial direction of male side connection part 22C, and is exposed at the end surface on the tip side of male side connection part 22C.

[0032] In the joint 20 of this embodiment, the main body portion 22, the intermediate portion 24, the sleeve 28, and the release ring 32 are made of a resin material, and the lock ring 40 is made of a metal such as stainless steel.

[0033] (main part) The body 22 of the joint 20 of this embodiment further has a long groove 60 and a partition portion 68. The long groove 60 is a groove recessed to a predetermined depth on the outer circumferential surface facing the insertion hole 30 in the body 22 and formed further forward than the circumferential groove 22B, for example, a groove having a depth similar to that of the circumferential groove 22B. A water-stopping material 62, which will be described later, is disposed inside the long groove 60. The water-stopping material 62 is an example of a second water-stopping material. The long groove 60 has an inner end and an outer end that face each other. The inner end is a surface formed at the inner end position, which is the position of the wall on the rear end side of the long groove 60, and the outer end is a surface formed at the outer end position, which is the position of the wall on the tip side of the long groove 60. The long groove 60 is formed at a diameter-reduced position 66.

[0034] The water-stopping material 62 is cylindrical and is disposed by being fitted into the long groove 60 from the outside of the main body 22. The water-stopping material 62 is a so-called water-expanding water-stopping material having a property of expanding by absorbing water, and is, for example, water-absorbent polymer rubber or SAP (Super Absorbent Polymers). The axial length of the water-stopping material 62 is longer than the cross-sectional diameter of the O-ring 34. The water-stopping material 62 has a thickness equal to or less than the depth of the long groove 60 in a non-water-absorbed state before absorbing water. In a water-absorbed state after absorbing water, the water-stopping material 62 expands inside the long groove 60 and contacts the inner end and outer end of the long groove 60 in the axial direction and the inner circumferential surface of the pipe 10 inserted into the insertion hole 30 in the radial direction. The water-stopping material 62 is preferably provided with a faster expansion speed, which is indicated by the expansion ratio relative to the immersion time.

[0035] The frictional resistance of the outer peripheral surface 62A of the water-stopping material 62 is set to be greater than the frictional resistance of the inner tubular portion 22A of the main body portion 22. In this embodiment, fine irregularities (not shown) are formed on the outer peripheral surface 62A of the water-stopping material 62, so that the frictional resistance of the outer peripheral surface 62A of the water-stopping material 62 is set to be greater than the frictional resistance of the inner tubular portion 22A of the main body portion 22. Note that an adhesive material may be applied to the outer peripheral surface 62A of the water-stopping material 62 instead of the irregularities.

[0036] The partition portion 68 is a wall extending in the axial direction between the circumferential groove 22B and the long groove 60, and is formed on the outer circumferential surface of the body portion 22. The partition portion 68 restricts the axial movement of the O-ring 34 fitted in the circumferential groove 22B and the water-stopping material 62 fitted in the long groove 60. The partition portion 68 expands in diameter from the inner end position at the inner end of the long groove 60 toward the circumferential groove 22B.

[0037] (Action and Effects) When connecting the pipe 10 to the fitting 20 in this embodiment, the pipe 10 is inserted into the insertion hole 30 of the fitting 20. Then, the tip of the pipe 10 expands the diameter of the lock ring 40, and the pipe 10 is inserted further in while the outer circumferential surface of the pipe 10 slides against the claw portions 42 of the lock ring 40, and the inner circumferential surface of the pipe 10 is pressed against the O-ring 34 with the water-stopping material 62 covered. When the pipe 10 is further inserted, the tip of the pipe 10 reaches the wall surface 23 of the main body 22, and the connection is completed.

[0038] In the pipe 10 after the connection is completed, the axial length of the water-stopping material 62 is longer than the O-ring 34, and the water-stopping material 62 is formed on the tip side (one end side) of the O-ring. Even if a foreign object gets between the outer circumferential surface of the O-ring 34 and the inner circumferential surface of the pipe 10 during construction to connect the pipe 10 to the joint 20, the water-stopping material 62 comes into surface contact with the inner circumferential surface of the pipe 10 in the axial direction. When the water-stopping material 62 comes into surface contact with the pipe 10, fluid does not leak from the joint 20 due to a pressure difference. This suppresses water leakage after the pipe 10 is connected, which is caused by a foreign object getting between the O-ring 34 and the pipe 10 when the pipe 10 is connected.

[0039] Furthermore, the joint 20 of the present application has the effect of preventing foreign matter from entering between the outer peripheral surface of the O-ring 34 and the inner peripheral surface of the pipe 10. Specifically, due to fine irregularities formed on the outer peripheral surface 62A of the water-stopping material 62, foreign matter is captured by the outer peripheral surface 62A of the water-stopping material 62. This prevents the foreign matter from entering the O-ring 34. If an adhesive member is applied to the outer peripheral surface 62A of the water-stopping material 62, the foreign matter is captured by the adhesive force (tackiness) of the adhesive member, thereby preventing the foreign matter from entering the O-ring 34.

[0040] Next, under normal conditions, a fluid such as water flows inside the pipe 10 after the connection has been completed. When the fluid penetrates between the inner peripheral surface of the pipe 10 and the outer peripheral surface of the main body 22, the fluid comes into contact with the water-stopping material 62, as shown in Fig. 2. The water-stopping material 62 that comes into contact with the fluid expands due to water absorption in the axial direction of the long groove 60 and in the radial direction of the water-stopping material 62. Since the water-stopping material 62 expands only when it absorbs water, deterioration in workability can be suppressed compared to a configuration in which the water-stopping material 62 always protrudes from the long groove 60.

[0041] The water-stopping material 62 has a thickness equal to or smaller than the long groove 60 of the main body 22 before absorbing water. This can further suppress deterioration in workability compared to a configuration in which the water-stopping material 62 protrudes from the long groove 60. Furthermore, when the inner surface of the pipe 10 is sealed with the O-ring 34 and the water-stopping material 62, the inner surface of the pipe 10 is less likely to be scratched compared to the outer surface of the pipe 10, so that the sealing performance of the O-ring 34 and the water-stopping material 62 is improved.

[0042] The long groove 60 has an inner end portion at the inner end position on the rear end side (other end side) in the axial direction, and the body portion 22 has a partition portion 68 between the circumferential groove 22B and the long groove 60, the partition portion 68 expanding in diameter from the inner end position toward the circumferential groove 22B. Compared to a configuration in which there is no partition portion 68 between the circumferential groove 22B and the long groove 60, the seating of the O-ring 34 and the water-stopping material 62 can be improved.

[0043] The main body 22 has a tapered section 64 provided at the axial tip (one end) that reduces the inner diameter from the tip toward the axial rear end (the other end) to a reduced diameter position, and the long groove 60 of the main body 22 has an outer end provided at the axial tip side (one end side) at the reduced diameter position. Compared to a configuration in which the water-stopping material 62 is provided on the axial tip side (one end side) of the reduced diameter position, the strength of the main body 22 can be maintained even when the water-stopping material 62 is provided.

[0044] (Modification) Although the present disclosure has been described in detail with respect to specific embodiments, it will be apparent to those skilled in the art that the present disclosure is not limited to such embodiments, and that the present disclosure can take on various other embodiments within the scope of the present disclosure.

[0045] The joint 20 has been described as a so-called one-touch joint that is screwed into the connection target 44, but is not limited to this. For example, it may be a so-called elbow or tee joint in which the main body is formed in an L-shape or T-shape and the joint 20 is formed at the open end.

[0046] Although the first water stop material has been described using the O-ring 34, the present invention is not limited to this. For example, the first water stop material may be a labyrinth seal.

[0047] Although the water-stopping material 62 has been described as being cylindrical, this is not limiting. The water-stopping material 62 may have any shape as long as it deforms when absorbing water and comes into contact with the inner surface, and may be, for example, a prismatic or lattice shape. Furthermore, although the water-stopping material 62 has been described as having a property of expanding by absorbing water, it is not necessary for it to have this property. Furthermore, although one water-stopping material 62 has been described as being disposed, multiple water-stopping materials may be disposed.

[0048] Although the partition 68 is configured to increase in diameter from the front end side to the rear end side on the outer circumferential surface of the main body 22, the present invention is not limited to this. For example, the partition 68 does not have to increase in diameter.

[0049] Although the tapered portion 64 is disposed on the main body portion 22, the present invention is not limited to this. For example, the tapered portion 64 does not have to be disposed on the main body portion 22.

[0050] (Contribution to the United Nations-led Sustainable Development Goals (SDGs)) The SDGs have been proposed to realize a sustainable society. One embodiment of the present invention is expected to contribute to the achievement of "No. 6 - Clean Water and Sanitation for the World." [Explanation of symbols]

[0051] 10 Pipe (cylindrical body), 20 Fitting, 22 Main body, 22A Inner tube, 22B Circumferential groove (first groove), 23 Wall surface, 24 Middle part (cover part), 24A Tip part, 26 Fitting main body, 27 Flow path, 28 Sleeve, 30 Insertion hole, 32 Release ring, 34 O-ring (first water stop material), 40 Lock ring, 42 Claw part, 44 Connection object, 48 Tip member, 60 Long groove (second groove), 62 Water stop material (second water stop material), 62A Outer circumferential surface, 64 Tapered part, 66 Diameter reduction position, 68 Partition part

Claims

1. a cylindrical main body having a first groove formed on an outer peripheral surface and a second groove formed on one end side in an axial direction relative to the first groove; a cover portion provided to cover the first groove and the second groove of the main body portion and sandwiching a cylindrical body inserted from one end side of the main body portion between an inner circumferential surface and an outer circumferential surface of the main body portion; A first water-stopping material that is annular and disposed in the first groove; A second water-stopping material that is cylindrical, is disposed in the second groove, and has an axial length longer than a cross-sectional diameter of the first water-stopping material; A fitting comprising:

2. The second water-stopping material has a property of expanding by absorbing water.

2. The joint of claim 1.

3. The second water-stopping material has a thickness equal to or less than the depth of the second groove of the main body portion in a non-water-absorbed state. A joint according to claim 2.

4. the second groove of the main body portion has an inner end portion at an inner end position on the other end side in the axial direction, The main body portion has a partition portion between the first groove and the second groove, the partition portion expanding in diameter from the inner end position toward the first groove.

2. The joint of claim 1.

5. The main body portion has a tapered portion provided at one end in the axial direction, the tapered portion reducing an inner diameter from the one end toward the other end in the axial direction to a reduced diameter position, The second groove of the main body portion has an outer end portion provided at the reduced diameter position on one end side in the axial direction.

2. The joint of claim 1.

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