JP2003056767A - Resin-made in-core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin-made in-core easily and inexpensively manufacturable, having high earthquake resistance, and not corroded by rust. SOLUTION: The inner peripheral surface is provided with a groove 11 for a seal ring from an opening 12 side, and a groove 15 for a breakaway preventing ring continuously having a tapered surface 13 of which the diameter gradually expands from the opening 12 side to the back side and a circumferential surface 14 substantially parallel with the axial line at a position on the back side separated from the groove 11 for the seal ring. The resin-made inner core inserted into the end of an insert hole 9 inserted from the opening 12 side of a socket 10 of an olefin based resin-made breakaway preventing joint in which a seal ring 20 is mounted in the groove 11 and the breakaway preventing 18 is mounted in the groove 15, is manufactured of resin having tension elasticity of 1000 to 4000 MPa, for example polyacetal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-made incore for reinforcing an insertion opening which is inserted into an insertion opening end portion of a removal prevention joint having a separation prevention function.

Conventionally, various in-cores to be attached to the insertion port inserted in the separation prevention joint have been proposed, and an example thereof is disclosed in Japanese Patent Laid-Open No. 2000-130659. According to the publication, as shown in FIG. 7, 23 is a joint body, and a sealing rubber ring 25 is mounted in an annular groove 24 provided in the inner peripheral surface on the opening end side of the joint body. The inner peripheral surface of the joint body 23 located on the farther side has an inclined groove 26 whose diameter increases toward the inner side.
Inside the socket, in which the split ring 27 for pipe tightening, which has an inclined outer peripheral surface that substantially coincides with the inner peripheral surface thereof, is arranged in a loosely fitted state, and inside the opening 28 is a cylindrical shape corresponding to the in-core of the present invention. In the pipe connection structure in which the spigot 28 having the reinforcing member 29 mounted therein is inserted and connected, one end of the reinforcing member 29 is folded back outward to form a folded back portion 30, and the maximum outer diameter of the folded back portion 30 is 90 to 10 of the outer diameter of the outlet 28 of the resin pipe
The structure was 0%. The material of the reinforcing member 29 is preferably metal, particularly stainless steel. The effect is that the reinforcing member 29 is mounted in the outlet 28,
The spigot 28 is preferably reinforced so that the tightening force of the split ring 27 and the rubber ring 25 for sealing can be enhanced over a long period of time.
8 did not cause dimensional deformation.

[0003]

However, the above-mentioned reinforcing member has the following problems. In order to provide the folded-back portion 30 when molding the reinforcing member 29, a cylindrical stainless steel reinforcing member 2 is formed by a method such as press molding.
It is necessary to fold the end of 9 to the outside, and the reinforcing member 29
In addition to requiring technology and labor for molding, the cost was high. In addition, the detachment prevention joint made of polyolefin resin is usually used for earthquake resistance because of its flexibility,
When an earthquake occurs, the conventional polyethylene resin separation prevention joint can follow fluctuations in the pipe axis direction (horizontal direction) and prevent water leakage, but the reinforcing member 29 is made of metal and prevents separation. Since the material of the joint has a much higher hardness than other parts, it has a polyethylene resin outlet 28 or a large variation in the vertical direction due to an earthquake or the like, that is, a large variation in the shearing direction. The joint body 23 is easily deformed and can follow the fluctuation thereof, but the reinforcing member 29 hardly deforms, cannot follow the fluctuation, cannot absorb the fluctuation force, and the load is applied to the inlet 28 and the joint body 23. This may damage the disconnection prevention joint. Further, since the reinforcing member 29 has a relatively large liquid contact area in the pipe, there is a fear of corrosion due to rust.

The present invention has been made in view of the problems of the prior art as described above, and the purpose thereof is to be easy to manufacture, inexpensive to manufacture, excellent in earthquake resistance, and free from fear of corrosion due to rust. A resin incore is provided.

[0005]

To solve the above problems, the structure of the present invention will be described with reference to FIGS. That is, the in-core of the present invention is provided with a seal ring groove 11 on the inner peripheral surface from the opening 12 side, and a position separated from the seal ring groove 11 to the back side from the opening 12 side to the back side for a while. A seal ring 20 is provided in the seal ring groove 11 having a groove 15 for a separation prevention ring in which a taper surface 13 that expands in diameter and a circumferential surface 14 that is substantially parallel to the axis line are continuously provided.
However, the separation prevention ring 18 is inserted into the separation prevention ring groove 15.
Is a resin-made in-core inserted into the end of the insertion port 9 inserted from the opening 12 side of the receiving port 10 of the olefin-based resin separation prevention joint, and has a tensile elastic modulus of 10
The first thing is to consist of resin of 00MPa to 4000MPa
It is a feature of.

Further, the resin-made in-core is continuously provided with a cylindrical portion 7 in which projecting ridges 5 are intermittently provided in the circumferential direction of the outer peripheral surface, and a flange portion 6 having a taper portion 8 whose diameter is temporarily reduced. That is the second feature. A third feature is that the resin is made of any one resin selected from polyacetal, nylon, polyphenylene sulfide, polyether ether ketone, polyether sulfone, and polyvinyl chloride.

In the present invention, the resin used for the resin incore has a tensile elastic modulus of 1000 MPa to 4000 MM.
It is set within the range of Pa. More preferably 2800
The range of MPa to 4000 MPa is desirable. If the resin has a tensile modulus of less than 1000 MPa, the insertion port 9 and the receiving port 1
The tensile elastic modulus of the high density polyethylene, which is preferably used among the olefin resins as the material of No. 0, is lower than that, and the reinforcing effect cannot be obtained. On the other hand, the higher the tensile elastic modulus, the better, but since the maximum tensile elastic modulus of the thermoplastic resin currently in circulation is about 4000 MPa, the upper limit is 4000 MPa.

Further, the tensile elastic modulus is 1000 MPa to 40
Examples of resins in the range of 00 MPa include polyacetal, polyamide, polyphenylene sulfide, polyether ether ketone, polyether sulfone, polyvinyl chloride, polyethylene terephthalate, polycarbonate,
Polyethylene terephthalate, polyvinylidene fluoride and the like can be mentioned, but preferably polyacetal (tensile modulus: 2500 MPa to 3200 MPa), polyamide (tensile modulus: 2200 MPa to 2800 MPa), polyphenylene sulfide (tensile modulus: 2700 MP).
a to 3200 MPa), polyether ether ketone (tensile elastic modulus: 3800 MPa to 4000 MPa), polyether sulfone (tensile elastic modulus: 2200 MPa to 2)
600 MPa), polyvinyl chloride (tensile modulus: 300
0 MPa to 3500 MPa).

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to FIGS. 1 to 6 showing its embodiments, but it goes without saying that the present invention is not limited to these embodiments. Figure 1
FIG. 3 is a vertical cross-sectional view showing an embodiment of a resin incore according to the present invention. 2 is a perspective view of the resin incore of FIG. 1, FIG. 3 is a vertical cross-sectional view showing a state before the insertion port in which the resin incore of FIG. 1 is mounted is connected to the receiving port of the separation prevention joint, and FIG.
6 is a vertical cross-sectional view after connection in FIG. 3, FIG. 5 is a vertical cross-sectional view showing a state when a force in the detaching direction is applied to the insertion opening in FIG. 4, and FIG.
FIG. 6 is a vertical cross-sectional view when a force in a shearing direction is applied to the separation prevention joint in FIG. 4.

In the figure, 1 is an incore made of polyacetal. The in-core 1 extends from the insertion side 2 inserted into the insertion opening 9 toward the pipe end side 3, and has a chamfered portion 4 and a ridge portion 5 having a long side in the circumferential direction of the outer peripheral surface continuous with the flange portion 6. A flange portion 6 having a pair of cylindrical portions 7 provided in the same direction and a tapered portion 8 which is provided so as to have a diameter larger than that of the cylindrical portion 7 and whose diameter is temporarily reduced on the outer peripheral surface.
And are continuously provided. The maximum outer diameter D of the collar portion 6 is provided so as to be substantially equal to the outer diameter of the insertion opening 9. In addition, the outer diameter C of the cylindrical portion 7 including the protruding portion 5 is
The size is provided to be 101% of the inner diameter of, but is not limited to this, and it is preferable to be provided in the range of 100% to 104%. The wall thickness t of the incore 1 is set within the range of 1% to 10% of the outer diameter E of the cylindrical portion 7 of the incore 1. When the wall thickness t is less than 1% of the outer diameter E, sufficient strength to reinforce the insertion slot 9 cannot be obtained, and the wall thickness t is 10 of the outer diameter E.
%, The inner diameter of the in-core 1 becomes small and narrow, and a sufficient flow rate cannot be obtained. Therefore, the wall thickness t is preferably set within a range of 2% to 5% of the outer diameter E. desirable. In the present embodiment, the ridge portion 5 provided on the outer peripheral surface of the cylindrical portion 7 is provided continuously with the flange portion 6, but the ridge portion 5 is provided separately from the flange portion 6. Well not limited to this.

In FIG. 3, reference numeral 9 designates a polyethylene insertion port, and the incore 1 is inserted into the inner peripheral surface of the end of the insertion port 9.

Numeral 10 is a polyethylene receptacle, which has a seal ring groove 11 on the inner peripheral surface from the opening side, a position separated from the seal ring groove 11 to the back side, and extends from the opening 12 side to the back side. A groove 15 for the separation prevention ring is formed by continuously providing a tapered surface 13 that temporarily expands in diameter and a circumferential surface 14 that is substantially parallel to the axis. The taper surface 1 whose diameter is reduced further toward the rear side from the separation preventing ring groove 15
6 and the contact surface 17 are continuously provided.

Denoted at 18 is a resin-made detachment prevention ring which is mounted in the detachment prevention ring groove 15. The detachment prevention ring 18 is provided with a cutout portion having a constant width at one place so that the detachment prevention ring can be expanded and contracted. A locking blade 19 having a serrated cross section is provided on the inner circumference.

Reference numeral 20 denotes a rubber seal ring which is mounted in a seal ring groove 11 provided on the inner peripheral surface of the polyethylene receptacle 10.

The operation of this embodiment will be described below. First, the incore 1 is inserted into the end portion of the insertion opening 9. At this time, the chamfered portion 4 is provided on the insertion side 2 of the in-core 1, and the outer diameter E of the cylindrical portion 7 of the in-core 1 is smaller than the inner diameter of the insertion opening 9 and the cylindrical portion 7 of the portion including the protruding portion 5 is provided. Since the outer diameter C is set to 101% of the inner diameter of the insertion opening 9, it can be smoothly inserted into the end portion of the insertion opening 9, and the in-core 1 can fall out from the end portion of the insertion opening 9. Can be prevented. Further, since the ridges 5 are provided intermittently in the circumferential direction of the outer peripheral surface of the cylindrical portion 7, the in-core (not shown) in which the ridges are continuously provided in the circumferential direction of the outer peripheral surface of the cylindrical portion. No)
Compared with the above, when inserting into the end of the insertion opening 9, the contact surface between the outer peripheral surface of the incore 1 and the inner peripheral surface of the end of the insertion opening 9 is small, friction resistance is reduced, and the insertion load when inserting the incore 1 is reduced. Get smaller.

Next, from the state shown in FIG. 3, the insertion port 9 into which the incore 1 is inserted is inserted into the opening 12 of the receiving port 10. The flange portion 6 of the in-core 1 is provided at the tip of the insertion opening 9, the taper portion 8 is provided on the flange portion 6, and the outer diameter D of the flange portion 6 is set to be substantially the same as the outer diameter of the insertion opening 9. Therefore, the slot 9 is the socket 10
It can be inserted smoothly into the inside. The insertion slot 9 penetrates through the seal ring 20, gradually expands the inner circumference of the separation prevention ring 18, moves to the inner side of the receiving slot 10, and the tip of the insertion slot 9 passing through the separation prevention ring 18 receives the receiving slot 10. After moving to the back side, the flange portion 6 of the incore 1 inserted into the insertion opening 9 comes into contact with the contact surface 17 on the back side of the receiving opening 10 to complete the insertion (state of FIG. 4).
At this time, the taper surface 16 on the back side of the receiving opening 10 and the taper portion 8 of the collar portion 6 are set so as to substantially coincide with each other, so that the insertion opening 9 can be prevented from being obliquely inserted into the receiving opening.

When a force is applied to the insertion slot 9 from the state of FIG. 4 in the removal direction (the direction of the arrow in FIG. 5), the removal prevention ring 18 moves in the removal direction while being locked to the outer peripheral surface of the insertion slot 9. The taper surface 21 of the separation prevention ring 18 is pressed by the taper surface 16 of the separation prevention ring groove 15 to exert a force for reducing the diameter of the separation prevention ring 18, and the separation prevention ring 18 contracts to insert the insertion opening 9. Tightening, the locking blade 19 begins to bite into the outer peripheral surface of the insertion slot 9 (state of FIG. 5).

When the force in the detaching direction is further increased from the state shown in FIG. 5, the retaining blade 19 of the detachment preventing ring 18 is further reduced in diameter and tries to be tightened so as to deform the insertion opening 9.
The insertion opening 9 is reinforced by the in-core 1 inserted into the insertion opening 9, and deformation of the insertion opening 9 due to tightening of the separation prevention ring 18 can be suppressed.

Further, from the state of FIG. 5, when a large vertical fluctuation due to an earthquake or the like, that is, a large external force in the shearing direction is applied to the separation prevention joint and the insertion opening 9 (direction of arrow in FIG. 6), the insertion opening 9 and Since the separation prevention joint 22 is made of polyethylene, it has flexibility, is easily deformed even with respect to a force in the shearing direction, and can follow the fluctuation, and the separation prevention joint or the insertion port 9 is not damaged. Further, since the in-core 1 is made of resin, the in-core 1 itself is also easily deformed and can follow the fluctuation, and the detachment prevention joint 22 or the insertion opening 9 is prevented from being damaged without applying an extra load to the inside of the detachment prevention joint 22. You can

Since the material of the incore 1 is resin,
Does not rust like metal incores.

[0021]

INDUSTRIAL APPLICABILITY As described above, the resin incore of the present invention has the following excellent effects. (1) When a resin incore is used, against deviation force in the shearing direction of the separation prevention joint and insertion port due to an earthquake,
By deforming the in-core according to the deformation of the detachment prevention joint and the insertion port, it is possible to absorb the fluctuation force, stress does not concentrate, and it is possible to follow the deformation and prevent the destruction of the detachment prevention joint or the insertion port. You can (2) Since it is made of resin, it can be manufactured by injection molding, and the in-core can be easily manufactured at low cost. (3) Since it is made of resin, it is light and does not rust.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a resin incore according to the present invention.

FIG. 2 is a perspective view of the resin incore of FIG.

FIG. 3 is a vertical cross-sectional view showing a state before the insertion opening to which the resin incore of FIG. 1 is attached is connected to the reception opening of the separation prevention joint.

4 is a vertical cross-sectional view after connection in FIG.

FIG. 5 is a vertical cross-sectional view showing a state when a force in the detaching direction is applied to the insertion opening in FIG.

6 is a vertical cross-sectional view when a force in a shearing direction is applied to the separation prevention joint in FIG.

FIG. 7 is a vertical cross-sectional view showing a separation prevention joint equipped with a conventional in-core.

[Explanation of symbols]

1 incore 2 insertion side 3 Pipe end side 4 chamfer 5 ridges 6 collar part 7 Cylindrical part 8 Tapered part 9 insertion 10 mouth 11 Seal ring groove 12 openings 13 Tapered surface 14 Circumferential surface 15 Detachment prevention ring groove 16 Tapered surface 17 Contact surface 18 Release prevention ring 19 Locking blade 20 seal ring 21 Tapered surface 22 Detachment prevention joint 23 Fitting body 24 annular groove 25 rubber ring 26 Inclined groove 27 split ring 28 Slip 29 Reinforcement member 30 Folding part

Claims (3)

[Claims] 1. A seal ring groove (11) on the inner peripheral surface from the opening (12) side, and a position separated from the seal ring groove (11) to the inner side from the opening (12) side. Has a groove (15) for a separation prevention ring in which a taper surface (13) that temporarily expands toward the side and a circumferential surface (14) that is substantially parallel to the axis are continuously provided. 11) the seal ring (20) is provided with the groove (1) for the separation prevention ring.
5) Inserted into the end of the insertion opening (9) inserted from the opening (12) side of the receiving opening (10) of the olefin resin separation prevention joint in which the separation prevention ring (18) is attached. Resin incore with tensile modulus of 1000 MPa
A resin-made incore, which is made of a resin of up to 4000 MPa. 2. A cylindrical portion (7) having projecting ridges (5) intermittently provided in the circumferential direction of the outer peripheral surface, and a collar portion (6) having a taper portion (8) whose diameter is temporarily reduced. The resin incore according to claim 1, wherein the resin incore is provided. 3. The resin according to claim 1 or 2, which is made of any one resin selected from polyacetal, polyamide, polyphenylene sulfide, polyether ether ketone, polyether sulfone and polyvinyl chloride. The resin-made incore described.