JP2010223423A - Watertight structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a watertight structure capable of positively carrying out sealing even in a pipe having linear scratches on the outer peripheral surface. <P>SOLUTION: A first seal groove 21 on a side infiltrated with water to be sealed and a second seal groove 22 on an atmosphere side are recessed on the inner peripheral surface of an insertion hole Z of a pipe joint 2 inserted with a pipe end, a first seal 61 is attached to the first seal groove 21, a second seal 62 is attached to the second seal groove 22, and a water absorbing expansion-sealing-agent 20 is attached to the inner peripheral surface 13A of a partition protruding part 13 partitioning the first seal groove 21 and the second seal groove 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a watertight structure.

Conventionally, as a watertight structure composed of a pipe and a pipe joint used for water supply / hot water supply or the like, a structure as shown in FIG. 10 already proposed by the present inventors is known (see Patent Document 1).
That is, the pipe joint 40 in which the circular concave groove 41 into which the connected pipe P ′ is inserted has an opening shape in the axial direction outward A is formed by the insertion tube portion 42 inserted into the inner peripheral surface of the pipe P ′ and the outer pipe portion 42. A cylindrical portion 43 is provided, and the inner cylindrical portion 42 and the outer cylindrical portion 43 form the circular concave groove 41. Further, the circular concave groove 41 bites into the outer peripheral surface 44 of the inserted pipe P ′. It has a pocket portion 41A for accommodating a C-shaped locking ring 46 (see FIG. 9) having a locking claw 45 for movement in the axial direction L and the radial direction R so as to be movable in small dimensions. 47 is an anti-rattle ring made of a resilient material that prevents the locking ring 46 from moving in a small dimension within the accommodation pocket portion 41A.

Further, the locking ring 46 has a tapered outer peripheral surface portion 48 which is reduced in diameter in the axial direction outer direction A. The outer cylindrical portion 43 has a tapered inner surface portion 49 that is compressed in the inner diameter direction by the tapered outer peripheral surface portion 48 of the locking ring 46, close to the outer end in the axial direction outer direction A. Further, the insertion tube portion 42 has a seal groove 50 formed in the outer peripheral surface thereof, a special shape sealing material 51 is fitted therein, and the sealing material 51 is attached to the inner peripheral surface 52 of the inserted pipe P ′. Close and watertight.
When the pipe P ′ is inserted into the circular concave groove 41 from the state of FIG. 10, the outer peripheral surface 44 of the pipe P ′ is slidably contacted with the locking claw 45 and elastically deforms the locking ring 46 in the diameter increasing direction. Thus, the pipe P ′ can be inserted into the inner part beyond the locking ring 46.

When a pulling force is applied to the pipe P ′, the locking ring 46 is pulled out in the axial direction L outward (by the locking force on the light outer peripheral surface 44 of the locking claw 45) by a small dimension, and then tapered. By being strongly squeezed in the direction of diameter reduction by the inner surface portion 49, the locking claw 45 strongly bites into the outer peripheral surface 44 of the pipe P 'and strongly prevents the pipe P' from being pulled out and maintains the connected state.
The pipe P ′ mainly applied to this is a composite pipe in which a metal inner layer 53 such as Al is laminated in a sandwich shape with plastic layers 54 and 55 such as inner and outer cross-linked PE resins.

Japanese Patent No. 4179919

However, the conventional pipe joint (watertight structure) shown in FIGS. 9 and 10 has the following problems.
The seal material 51 needs to have a special cross-sectional shape. If an O-ring that is usually widely used is used and the rectangular seal groove 50 is used as the O-ring groove, the bottom of the seal groove 50 the thickness dimension T ₅₀ is extremely thin, since the strength problem, in order to increase the thickness dimension T ₅₀ sufficiently, it is inevitable to reduce the inner diameter ΦD the inner挿筒portion 42, which As a result, there has been a problem that passage resistance of flowing hot water / water increases. Of course, even with the sealing material 51 as shown in the figure, the thickness T ₅₀ is smaller than the original thickness T ₄₂ , so the inner diameter ΦD must be made smaller.

Further, when the locking claw 45 of the locking ring 46 as shown in FIGS. 9 and 10 is brought into sliding contact with the outer peripheral surface of the pipe P ′, a concave line-shaped scratch in the longitudinal direction is formed on the outer peripheral surface 44 of the plastic layer 55. Therefore, conventionally, when the sealing material 51 of the inner cylindrical portion 42 is provided on the inner peripheral surface of the outer cylindrical portion 43, water (including hot water) is passed through the scratches on the outer peripheral surface 44 of the pipe P ′. Therefore, the sealing material 51 and the sealing groove 50 have to be disposed in the insertion tube portion 42.
Further, in the pipe P ′ composed of the composite pipe as shown in FIG. 10, assuming that the sealing material 51 is transferred from the inner insertion cylinder part 42 to the outer cylinder part 43 side, the water pressure of the pipe P ′ of the composite pipe is increased. There is also a problem that the pipe P ′ is damaged by acting on the end face 56 and entering between the metal inner layer 53 and the outer plastic layer 55.

  Therefore, the watertight structure according to the present invention includes a first seal groove on the side into which sealing water enters the inner peripheral surface of the insertion hole of the pipe joint into which the pipe end portion is inserted, and an air side structure. A second seal groove is provided in a recessed manner, a first seal is mounted in the first seal groove, a second seal is mounted in the second seal groove, and the first seal groove and the second seal groove are further partitioned. A water-absorbing expansion sealant is attached to the inner peripheral surface of the partition convex portion to be formed.

  In addition, a first seal groove on the side into which the water to be sealed enters and a second seal groove on the atmosphere side are recessed in the inner peripheral surface of the insertion hole of the pipe joint into which the pipe end is inserted. The inner peripheral surface of the partition convex portion that mounts the first seal in the first seal groove, the second seal in the second seal groove, and further defines the first seal groove and the second seal groove. The outer surface of the second seal, the inner surface of the second seal groove, and the pipe in a water-flowing connection state in which a water-absorbing expansion sealant is attached to the pipe and the pipe joint is assembled. Between the outer peripheral surface of the end portion, the water-absorbing and expanding sealing agent that has absorbed and expanded is infiltrated and filled.

In addition, a first seal groove on the side into which the water to be sealed enters and a second seal groove on the atmosphere side are recessed in the inner peripheral surface of the insertion hole of the pipe joint into which the pipe end is inserted. The inner peripheral surface of the partition convex portion that mounts the first seal in the first seal groove, the second seal in the second seal groove, and further defines the first seal groove and the second seal groove. In addition, the water-absorbing expansion sealing agent is attached, and the pipe joint includes an insertion tube portion in which a seal groove is omitted, which is inserted into the inner peripheral surface of the pipe end portion, and the partition convex portion is It is formed with an annular body that is fitted into a circular hole that connects the bottom surfaces of both the first seal groove and the second seal groove and can be slightly moved in the axial direction.
The water-absorbing expansion sealant comprises a highly water-absorbing polymer and a non-hydrophilic sealant.

  Further, the watertight structure according to the present invention includes a first seal groove on the side into which sealed water enters the inner peripheral surface of the insertion hole of the pipe joint into which the pipe end portion is inserted, and an air side structure. A second seal groove is provided in a recessed manner, a first seal is mounted in the first seal groove, a second seal is mounted in the second seal groove, and the first seal groove and the second seal groove are further partitioned. A water-absorbing expansion water-stopping agent is attached to the inner peripheral surface of the partition convex portion to be formed.

  In addition, a first seal groove on the side into which the water to be sealed enters and a second seal groove on the atmosphere side are recessed in the inner peripheral surface of the insertion hole of the pipe joint into which the pipe end is inserted. The inner peripheral surface of the partition convex portion that mounts the first seal in the first seal groove, the second seal in the second seal groove, and further defines the first seal groove and the second seal groove. The outer surface of the second seal, the inner surface of the second seal groove, the inner surface of the second seal groove, and the water-absorbing expansion water-stopping agent are attached to the pipe and the pipe joint. Between the outer peripheral surface of the pipe end portion, the water-absorbing and expanding water-stopping agent that has absorbed and expanded water enters and is filled.

In addition, a first seal groove on the side into which the water to be sealed enters and a second seal groove on the atmosphere side are recessed in the inner peripheral surface of the insertion hole of the pipe joint into which the pipe end is inserted. The inner peripheral surface of the partition convex portion that mounts the first seal in the first seal groove, the second seal in the second seal groove, and further defines the first seal groove and the second seal groove. Further, the water-absorbing expansion water-stopping agent is attached, and the pipe joint is provided with an insertion cylinder portion that is inserted into the inner peripheral surface of the pipe end portion, the seal groove is omitted, and the partition convex portion is The ring is fitted with a circular hole that connects the bottom surfaces of the first seal groove and the second seal groove, and is formed with an annular body that can be slightly moved in the axial direction.
The water-absorbing swelling water-stopping agent comprises a highly water-absorbing polymer, non-swellable plastic fine powder, and an oil and fat agent.

  Moreover, the said plastic fine powder has an average particle diameter of 5 micrometers-50 micrometers. Further, the plastic fine powder is PTFE having an average particle diameter of 5 μm to 50 μm. And it is desirable for the said fats and oils to be silicone oil.

According to the watertight structure of the present invention, the water-absorbing expansion sealing agent or the water-absorbing expansion water-stopping agent penetrates and embeds into the longitudinal concave line wound of the pipe end outer peripheral surface, and the seal and the pipe end outer peripheral surface The space is densely pressed, and the water tightness is kept high.
The outer peripheral surface of the pipe can often be damaged by a concave ring or the like at the time of insertion into a pipe joint, or can be damaged during transportation or work after manufacture. However, according to the present invention, the sealing agent or the water-stopping agent expands due to water absorption under a water-flowing connection state, reliably exhibits watertightness, and provides a practically excellent sealing performance.

It is sectional drawing which shows one Embodiment of this invention and shows the non-water-permeable connection state which inserted the pipe. It is principal part sectional drawing of a pipe uninserted state. It is a principal part enlarged view of FIG. It is principal part explanatory drawing which expanded further of FIG. It is an operation explanatory view. It is an operation explanatory view. It is a principal part cross-sectional view for an effect | action description. It is explanatory drawing of the state which the extraction force acted on the pipe. It is explanatory drawing of an example of a locking ring. It is sectional drawing which shows a prior art example.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
2 shows the pipe not inserted state, FIG. 1, FIG. 3 and FIG. 4 show the non-water connection state with the pipe P inserted, FIG. 5 shows the state immediately after passing water, and FIG. 6 shows the water passing state. This is an embodiment of the present invention. First, in the present invention, “water” is defined to include cold water to warm water.
The pipe P is made of a synthetic resin such as a crosslinked PE resin, polybutene, PEX, or PP. Although the pipe joint 2 is illustrated in FIG. 1 as a whole in the case of the nipple type, the main part configuration exists in the connection (linkage) portion with the pipe P, and the whole of the socket type, elbow type, cheese type, etc. The structure and model are free.

  A circular recess 3 into which the end 1 of the pipe P is inserted has an opening shape in the axially outer direction A. That is, the insertion tube portion 5 is formed in a protruding shape as a part of the joint body 4 made of synthetic resin or the like, and the insertion tube portion 5 is surrounded from the periphery so that the synthetic resin is sequentially welded to the joint body 4. A cylindrical cover member 9 made of metal and a cap member 10 are connected and integrated, and the circular recess 3 is formed by an outer wall made up of a short cylindrical protruding wall 31 of the joint body 4, the cylindrical cover member 9 and the cap member 10. The tube portion 32 and the insertion tube portion 5 are surrounded.

  In other words, the insertion hole Z into which the end portion 1 of the pipe P is inserted is formed by the inner peripheral surface of the outer cylinder portion 32. In this way, the water W to be sealed enters the inner peripheral surface of the insertion hole Z formed by the protruding wall portion 31 of the joint body 4, the cylindrical cover member 9, and the cap member 10 ( A first seal groove 21 (on the left side in FIGS. 1 to 6) and a second seal groove 22 on the atmosphere side E are provided in a recessed manner, and a first seal 61 is provided in the first seal groove 21 and a second seal groove 22 is provided. The second seal 62 is attached to each of the two.

  As the first seal 61 and the second seal 62, the case of the first O-ring 11 and the second O-ring 12 having a circular cross section is illustrated in FIGS. 1 to 7, and hence the first seal 61 is hereinafter referred to as the first O-ring. 11 and the second seal 62 may be referred to as the second O-ring 12. The first and second seals 61 and 62 may be square rings, U packings, V packings or the like (not shown), but a simple shape with a small cross-sectional area is desirable.

Reference numeral 20 denotes a water-absorbing expansion sealant, and as shown in the water-impervious state of FIGS. 1 to 4, the inner periphery of the partition convex portion 13 that partitions the first seal groove 21 and the second seal groove 22. Attached to the surface 13A. Alternatively, instead of the water-absorbing expansion sealing agent 20, the water-absorbing expansion water-stopping agent 30 is attached to the same location.
Specifically, the cylindrical cover member 9 has a protruding bulging portion 9A in the inner diameter direction at the end on the atmosphere side E, and has an inner diameter larger than the inner diameter of the bulging portion 9A with the stepped portion 9B. A circular convex portion 14 is formed, and a circular convex body 15 is fitted into the circular hole 14 so as to be finely movable in the axial direction L, and the first and second sealing grooves 21 and 22 are partitioned. 13 is composed.

Thus, the torus 15 has a rectangular cross-sectional shape, is tightly fitted to the inner peripheral surface of the circular hole 14, and can be finely moved in the axial direction L, and is incorporated in the cylindrical cover member 9. ing. It is also possible to combine two toric bodies 15 (those having small dimensions in the axial direction) (not shown).
The circular hole 14 forms both groove bottom surfaces 21A and 22A of the first seal groove 21 and the second seal groove 22, and is connected to both groove bottom surfaces 21A and 22A with the same diameter.

And as for the pipe joint 2, as for the insertion cylinder part 5 inserted in the internal peripheral surface 1A of the pipe end part 1, a seal groove is abbreviate | omitted and a sealing material is also mounted | worn as an average thickness dimension of the insertion cylinder part 5 Is small enough (compared to FIG. 10).
Then, the water-absorbing expansion sealing agent 20 attached relatively thinly (as shown in FIG. 4) to the inner peripheral surface of the partition convex portion 13 made of the torus 15 is a mixture of a highly water-absorbing polymer and a non-hydrophilic sealing agent. For example, a commercially available product as shown in Table 1 below is applied.

  In Table 1, the highly water-absorbing polymer is preferably a polymer capable of volume expansion due to water absorption 20 times (volume) or more. Moreover, as a sealing agent, the consistency of about 170-300 is preferable. However, according to the test method specified in JIS-K2220. The sealing agent is not hydrophilic, has adhesiveness and adhesiveness, serves as a binder, and forms a very thin coating film on the surface in a state where the superabsorbent polymer absorbs water and expands. Those are preferred.

Further, in the case of a configuration in which the water-absorbing and expanding water-stopping agent 30 is attached to the inner peripheral surface of the partition convex portion 13 (as shown in Table 1), non-swellable plastic fine powder, oil and fat agent (shown in Table 1) And a superabsorbent polymer). The plastic fine powder has an average particle diameter of 5 μm to 50 μm, and if it is less than the lower limit value, the water stopping performance is abruptly deteriorated. As the plastic fine powder, PTFE having water repellent action is particularly desirable. In addition, as the oil and fat agent, silicone oil is suitable, and it is difficult to dissolve in water.
As an example, a commercial product as shown in the following Table 2 is applied as the water-absorbing expansion water-stopping agent.

  Paralic GTE 703 is commercially available as a lubricant, is an admixture of fine powder of PTFE and silicone oil, and is also harmless and preferable as drinking water.

3 and FIG. 4, when water is passed under the pipe connection state before water flow, the water W enters the first seal groove 21 as indicated by the arrow in FIG. 5, and as indicated by the dotted arrow W ₁₁ . Passes between the first O-ring 11 and the outer peripheral surface of the pipe end 1 and is absorbed by the water-absorbing expansion sealant 20 (or water-stopping agent 30) to start water-absorbing expansion (before and after) The first O-ring 11 in one seal groove 21 receives the pressure Pw of the water W, moves to the atmosphere side while being compressed and deformed, moves the torus 15 slightly in the direction of arrow C, and moves the second O-ring 12 The second O-ring 12 is pressed against the stepped portion 9B while being compressed and deformed. Subsequently, as shown in FIGS. 5 to 6, the water-absorbing expansion sealant 20 (or water-stopping agent 30) performs water-absorption expansion, and the outer surface of the second O-ring 12, the inner surface of the second seal groove 22, and the pipe end. It enters and fills the space between the outer peripheral surface of the part 1 (the gap). The inner surface of the second seal groove 22 includes a stepped portion 9 </ b> B, a groove bottom surface 22 </ b> A, and an outer end surface 15 </ b> A of the torus 15.

  Since the torus 15 is movable in the axial direction L and is fitted in the circular hole 14, the water W immediately moves in the direction of the arrow C as soon as the water W acts on the first O-ring 11 as shown by the arrow Pw. Then, the second O-ring 12 is compressed and elastically deformed, so that an extra water-absorbing and expanding sealing agent 20 (or water-stopping agent 30) is removed from the gap 16 between the inner peripheral surface of the bulging portion 9A and the pipe end 1 to the atmosphere side. Can be prevented from flowing to.

FIG. 7 is a cross-sectional view taken along the line Y-Y in FIG. 6. Further, when the outer circumferential surface of the pipe P has a longitudinal line scratch (concave line scratch) 17, the sealing agent 20 ( Alternatively, the water-stopping agent 30) penetrates into such a linear wound (concave line wound) 17 and enters the state of FIG. 7A to FIG. Between the inner peripheral surface and the outer peripheral surface of the pipe P, a “way” through which water leaks is closed.
Further, there is a case where the pipe P moves by a small dimension in the drawing direction with water flow, but the linear scratch 17 is surely filled with the water-absorbing expansion sealant 20 (or the water-stopping agent 30), and the second O Between the ring 12 (and the first O-ring 11) and the pipe end 1, a “way” through which water leaks is closed, and external leakage can be prevented.
Note that the scratch 17 is not limited to the longitudinal direction, and even if it is concave in the oblique direction, the sealing agent 20 (or the water stopping agent 30) that has absorbed and expanded water immediately enters and fills.
When the water-absorbing and expanding sealing agent 20 (or water-stopping agent 30) further absorbs water and expands from the state of FIG. 6, the first O-ring 11 moves to the left in FIG. The sealing agent 20 (or the water stopping agent 30) is prevented from becoming an excessive pressure, thereby preventing the cylindrical cover member 9 or the like from being damaged.

8 and 9, in the watertight structure according to the present invention, the C-shaped locking ring 46 is used in the same manner as described in the conventional example, and the outer peripheral surface of the pipe P made of synthetic resin. Further, the locking claw 45 of the locking ring 46 bites in and exhibits a strong pull-out preventing force. That is, the locking ring 46 is strongly reduced in diameter by the co-operation of the tapered outer peripheral surface portion 48 of the locking ring 46 and the tapered inner surface portion 49 of the cap member 10, and the locking claw 45 is reliably strong, It will bite into the outer peripheral surface.
Note that the present invention is not limited to the drawing prevention mechanism as shown in the figure, and can be applied to a wide variety of pipe joints of drawing mechanisms, and the closed toroid shown in FIG. Even if a piece that protrudes with the insertion of the pipe (or by manual operation) is inserted between the elastically expanded diameter C-type elastic clamping rings, is there.

As apparent from FIGS. 1 to 8, the present invention is as shown in FIG. 10 of the conventional example between the outer peripheral surface of the insertion tube portion 5 and the inner peripheral surface of the end portion 1 of the pipe P. A special sealing material is not required, and the conventional O-ring or the like is omitted. Accordingly, the average thickness T ₅ of the insertion tube portion 5 can be made sufficiently thin. Therefore, there is an advantage that the inner diameter dimension D of the insertion tube portion 5 can be increased and the water passage resistance can be reduced.

Although it has a thin wall thickness T ₅ , the presence of the insertion tube portion 5 allows the synthetic resin pipe P to be removed from the first and second seals 61 and 62 (first and second O-rings 11 and 12). Even when an external force in the reduced diameter direction and a large external force in the reduced diameter direction are received by the locking ring 46, abnormal deformation of the reduced diameter does not occur. Moreover, it is also free to manufacture the partition convex portion 13 integrally with the cylindrical cover member 9, and in this case also, the water-absorbing and expanding sealing agent 20 on the inner peripheral surface 13A immediately absorbs and expands as water flows. As a result, the sealing performance with the mating member on the outer surface of the second seal 62 (second O-ring 12) is ensured. In particular, the scratch 17 of the pipe P is filled with the water-absorbing expansion sealant 20, and the outside of the water W Leakage can be prevented (as well). It is also preferable to form a small groove on the inner peripheral surface of the torus 15 so that the sealing agent 20 and the water stop agent 30 are securely held in a state where the pipe is not inserted (not shown).

  As described above, the present invention includes the first seal groove 21 on the side into which the sealing water W enters the inner peripheral surface of the insertion hole Z of the pipe joint 2 into which the pipe end 1 is inserted, and the atmosphere. The second seal groove 22 on the side E is recessed, the first seal 61 is attached to the first seal groove 21, the second seal 62 is attached to the second seal groove 22, and the first seal groove is further provided. Since the water-absorbing expansion sealing agent 20 (water-absorbing expansion water-stopping agent 30) is adhered to the inner peripheral surface 13A of the partition convex portion 13 that partitions the 21 and the second seal groove 22, linear scratches are formed on the outer peripheral surface. Even if the pipe P has a scratch such as 17 or the like, and even if the outer diameter of the pipe P varies, the external leakage of the water W can be reliably prevented. (In addition, it has been confirmed that the high water absorption polymer alone cannot stop the external leakage of water.)

  In addition, the first seal groove 21 on the side into which the sealing water W enters the inner peripheral surface of the insertion hole Z of the pipe joint 2 into which the pipe end 1 is inserted, and the second seal on the atmosphere side E A groove 22 is provided in a recessed manner, a first seal 61 is mounted in the first seal groove 21, a second seal 62 is mounted in the second seal groove 22, and the first seal groove 21 and the second seal groove are further mounted. The water absorbing expansion sealant 20 is attached to the inner peripheral surface 13A of the partition convex portion 13 that forms the partition 22, and the pipe P and the pipe joint 2 are assembled and passed through the water connection state. Between the outer surface of the second seal 62 and the inner surface of the second seal groove 22 and the outer peripheral surface of the pipe end 1, the water-absorbing and expanding sealing agent 20 (water-absorbing and expanding water-stopping agent 30) infiltrates and penetrates. Therefore, it is possible to reliably exhibit excellent sealing performance over a long period of time. Moreover, since the pipe end 1 can be easily inserted into the pipe joint 2 in a state where it is not wet with water, the piping (connection) work can be easily and quickly performed.

  In addition, the first seal groove 21 on the side into which the sealing water W enters the inner peripheral surface of the insertion hole Z of the pipe joint 2 into which the pipe end 1 is inserted, and the second seal on the atmosphere side E A groove 22 is provided in a recessed manner, a first seal 61 is mounted in the first seal groove 21, a second seal 62 is mounted in the second seal groove 22, and the first seal groove 21 and the second seal groove are further mounted. 22 is attached to the inner peripheral surface 13A of the partition convex portion 13 that forms a partition, and the pipe joint 2 is connected to the inner periphery of the pipe end portion 1. The insertion cylindrical portion 5 with no seal groove inserted into the surface 1A is provided, and the partition convex portion 13 connects the groove bottom surfaces 21A and 22A of the first seal groove 21 and the second seal groove 22 to each other. In this configuration, the inner diameter dimension D of the insertion tube portion 5 can be sufficiently large. Ri, it is possible to reduce the passage resistance due to the flow of water, can reduce the pressure loss of the entire pipe provided with a plurality of the pipe joint 2. Furthermore, the annular body 15 moves outward in the axial direction L, and the second seal groove 22 of the second seal 62 can be reduced to further improve the sealing performance. Further, the cylindrical cover member 9 can be manufactured inexpensively and easily by injection molding of synthetic resin.

Further, the water-absorbing expansion sealant 20 is composed of a highly water-absorbing polymer and a non-hydrophilic sealant. Therefore, the softness of the highly water-absorbing polymer after the water absorption expansion is retained by the coating film of the sealing agent and has water tightness. Can be demonstrated over a long period of time.
Further, since the water-absorbing and expanding water-stopping agent 30 is composed of a highly water-absorbing polymer, a non-swellable plastic fine powder, and an oil and fat agent, the highly water-absorbing polymer after water-absorbing expansion can penetrate into a narrow gap and reliably Is possible. Especially the said plastic fine powder exhibits the outstanding water stop performance by an average particle diameter being 5 micrometers-50 micrometers. And by setting it as PTFE, there is no problem at all for drinking water and it is excellent in safety. Moreover, since the said plastic fine powder is PTFE with an average particle diameter of 5 micrometers-50 micrometers, the melt | dissolution to water is blocked | prevented reliably and safety | security increases further also for drinks.

DESCRIPTION OF SYMBOLS 1 End part 1A Inner peripheral surface 2 Pipe joint 5 Insertion cylinder part
11 1st O-ring
12 2nd O-ring
13 Compartment convex part
13A Inner peripheral surface
14 round holes
15 torus
17 Line wound (concave line wound)
20 Water-absorbing expansion sealant
21 First seal groove
22 Second seal groove
21A, 22A groove bottom
30 Water absorption expansion
61 First seal
62 2nd seal E Atmosphere side L Axial direction P Pipe T ₅ Thickness W Water Z Insertion hole

Claims (11)

  A first seal groove (21) on the side where water (W) to be sealed enters the inner peripheral surface of the insertion hole (Z) of the pipe joint (2) into which the pipe end (1) is inserted; The second seal groove (22) on the atmosphere side (E) is recessed, the first seal groove (21) is provided with the first seal (61), and the second seal groove (22) is provided with the second seal ( 62) is attached to the inner peripheral surface (13A) of the partition projection (13) that partitions the first seal groove (21) and the second seal groove (22). 20) A watertight structure characterized by adhering.   A first seal groove (21) on the side where water (W) to be sealed enters the inner peripheral surface of the insertion hole (Z) of the pipe joint (2) into which the pipe end (1) is inserted; The second seal groove (22) on the atmosphere side (E) is recessed, the first seal groove (21) is provided with the first seal (61), and the second seal groove (22) is provided with the second seal ( 62) is attached to the inner peripheral surface (13A) of the partition projection (13) that partitions the first seal groove (21) and the second seal groove (22). 20) is attached, and the outer surface of the second seal (62) and the second seal groove are in a water-flowing connection state in which the pipe (P) and the pipe joint (2) are assembled and passed through. A watertight structure characterized in that the water-absorbing and expanding sealant (20) that has absorbed water is infiltrated and filled between the inner surface of (22) and the outer peripheral surface of the pipe end (1). A first seal groove (21) on the side where water (W) to be sealed enters the inner peripheral surface of the insertion hole (Z) of the pipe joint (2) into which the pipe end (1) is inserted; The second seal groove (22) on the atmosphere side (E) is recessed, the first seal groove (21) is provided with the first seal (61), and the second seal groove (22) is provided with the second seal ( 62) is attached to the inner peripheral surface (13A) of the partition projection (13) that partitions the first seal groove (21) and the second seal groove (22). 20) Adhering and
Furthermore, the pipe joint (2) includes an insertion tube portion (5) in which a seal groove is omitted and is inserted into the inner peripheral surface (1A) of the pipe end portion (1), and the partition convex portion (13) is fitted into a circular hole (14) connecting the groove bottom surfaces (21A) (22A) of the first seal groove (21) and the second seal groove (22), and is axially (L) A watertight structure characterized in that it is formed with a ring (15) that can be moved slightly.   The watertight structure according to claim 1, 2 or 3, wherein the water-absorbing expansion sealant (20) comprises a highly water-absorbing polymer and a non-hydrophilic sealant.   A first seal groove (21) on the side where water (W) to be sealed enters the inner peripheral surface of the insertion hole (Z) of the pipe joint (2) into which the pipe end (1) is inserted; The second seal groove (22) on the atmosphere side (E) is recessed, the first seal groove (21) is provided with the first seal (61), and the second seal groove (22) is provided with the second seal ( 62), and a water-absorbing and expanding water-stopping agent is further applied to the inner peripheral surface (13A) of the partition convex portion (13) that partitions the first seal groove (21) and the second seal groove (22). A watertight structure characterized by adhering (30).   A first seal groove (21) on the side where water (W) to be sealed enters the inner peripheral surface of the insertion hole (Z) of the pipe joint (2) into which the pipe end (1) is inserted; The second seal groove (22) on the atmosphere side (E) is recessed, the first seal groove (21) is provided with the first seal (61), and the second seal groove (22) is provided with the second seal ( 62), and a water-absorbing and expanding water-stopping agent is further applied to the inner peripheral surface (13A) of the partition convex portion (13) that partitions the first seal groove (21) and the second seal groove (22). (30) is attached, and the outer surface of the second seal (62) and the second seal are connected under the water connection state in which the pipe (P) and the pipe joint (2) are assembled and passed through. The water-tight structure, wherein the water-absorbing and expanding water-stopping agent (30) is absorbed and expanded between the inner surface of the groove (22) and the outer peripheral surface of the pipe end (1). . A first seal groove (21) on the side where water (W) to be sealed enters the inner peripheral surface of the insertion hole (Z) of the pipe joint (2) into which the pipe end (1) is inserted; The second seal groove (22) on the atmosphere side (E) is recessed, the first seal groove (21) is provided with the first seal (61), and the second seal groove (22) is provided with the second seal ( 62), and a water-absorbing and expanding water-stopping agent is further applied to the inner peripheral surface (13A) of the partition convex portion (13) that partitions the first seal groove (21) and the second seal groove (22). (30)
Furthermore, the pipe joint (2) includes an insertion tube portion (5) in which a seal groove is omitted and is inserted into the inner peripheral surface (1A) of the pipe end portion (1), and the partition convex portion (13) is fitted into a circular hole (14) connecting the groove bottom surfaces (21A) (22A) of the first seal groove (21) and the second seal groove (22), and is axially (L) A watertight structure characterized in that it is formed with a ring (15) that can be moved slightly.   The water-tight structure according to claim 5, 6 or 7, wherein the water-absorbing water-stopping agent (30) comprises a highly water-absorbing polymer, a non-swellable plastic fine powder, and an oil and fat agent.   The watertight structure according to claim 8, wherein the plastic fine powder has an average particle diameter of 5 μm to 50 μm.   The watertight structure according to claim 8, wherein the plastic fine powder is PTFE having an average particle diameter of 5 μm to 50 μm. The watertight structure according to claim 8, 9 or 10, wherein the oil or fat agent is silicon oil.

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