JP2022147339A - Compressive caulking pipe joint - Google Patents

Abstract

To provide a compressive caulking pipe joint capable of preventing a resin pipe inserted between a joint body and a sleeve from coming off under a high-temperature environment.SOLUTION: A compressive caulking pipe joint 10 comprises a joint body 20 having a nozzle part 23 provided at its one end part, and a sleeve 30 surrounding the nozzle part 23. Between the nozzle part 23 and the sleeve 30, one end part of a resin pipe 70 is inserted, and the nozzle part 23 and the sleeve 30 are caulked, so that the one end part of the resin pipe 70 is watertightly sandwiched between the nozzle part 23 and the sleeve 30. In the compressive caulking pipe joint 10, a ring-shaped member 50 is arranged at a position where the resin pipe 70 abuts against the nozzle part 23, and a part of the ring-shaped member 50 is fitted into a ring-shaped member fitting groove 23c formed on the outer peripheral surface of the nozzle part 23 at the abutting position.SELECTED DRAWING: Figure 1

Description

The present invention relates to compression crimp pipe joints.

A metal-reinforced polyethylene pipe having an aluminum core layer and polyethylene resin layers formed on the inner and outer layers sandwiching the core layer, for example, as a piping material for water supply and hot water supply piped under the floor of a detached house or collective housing. etc. is used. Metal-reinforced polyethylene pipes are used, for example, in hot and cold water pipes for air conditioners.

In order to connect the resin pipe and a rigid pipe such as a metal pipe installed outdoors, for example, compression crimp pipe joints disclosed in Patent Documents 1 and 2 are used. The compression crimp pipe joint is made by inserting the end of the resin pipe between the nozzle portion of the joint body and the sleeve, and crimping the crimped portion of the sleeve using a dedicated crimping die set on a crimping tool. Connect the resin pipe watertight.

The nozzle portion has a ring-shaped sealing material fitting groove at a position corresponding to the crimped portion of the sleeve. A ring-shaped sealing material is fitted in the sealing material fitting groove.
By crimping, the resin pipe is deformed such that a portion corresponding to a position corresponding to the crimped portion of the sleeve is reduced in diameter toward the nozzle portion. Then, the inner wall surface of this deformed portion is pressed against the ring-shaped sealing material, and the resin pipe is watertightly connected to the compression crimped pipe joint. Moreover, since the ring-shaped sealing material and the joint body are fixed with an adhesive, the ring-shaped sealing material will not come off from the joint body when crimped, and water will not leak.

JP 2005-325904 A JP 2011-169335 A

Conventionally, in a compression crimp pipe joint, the adhesive placed between the ring-shaped sealing material and the joint body may be softened by heat in a high-temperature environment such as a fire. As the adhesive softens, its bond strength decreases. When the bonding strength of the adhesive decreases, the stress caused by the load perpendicular to the pipe axis during crimping separates the ring-shaped seal material from the joint body, causing the resin pipe to come out of the compression crimped pipe joint, resulting in water leakage. Occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compression crimp pipe joint that prevents a resin pipe inserted between a joint body and a sleeve from coming off in a high-temperature environment. do.

In order to solve the above problems, the present invention has the following aspects.
[1] A joint body having a nozzle portion provided at one end thereof, and a sleeve surrounding the nozzle portion, wherein one end portion of a resin pipe is inserted between the nozzle portion and the sleeve, and the A compression crimping pipe joint for watertightly sandwiching one end of the resin pipe between the nozzle portion and the sleeve by crimping the nozzle portion and the sleeve, wherein A compression caulking pipe joint, wherein a ring-shaped member is arranged, and a part of the ring-shaped member is fitted into a fitting groove formed in an outer peripheral surface of the nozzle portion at the abutment position.
[2] The compression crimping pipe joint according to [1], wherein the ridge on the side opposite to the nozzle portion is chamfered on the inner peripheral surface side of the ring-shaped member.
[3] The compression crimp pipe joint according to [1], wherein the ring-shaped member is provided with a notch in the thickness direction and has a C shape in plan view.

Advantageous Effects of Invention According to the present invention, it is possible to provide a compression crimped pipe joint that prevents a resin pipe inserted between a joint body and a sleeve from coming off in a high-temperature environment.

1 is a cross-sectional view schematically showing a compression crimping pipe joint according to an embodiment of the present invention, taken along the pipe axis direction of the compression crimping pipe joint; FIG. FIG. 4 is a plan view showing a crimping tool used for a compression crimping pipe joint according to one embodiment of the present invention; 1 is a perspective view showing a crimping die attached to a crimping tool used for a compression crimping pipe joint according to an embodiment of the present invention; FIG. 1 is a perspective view showing a crimping die attached to a crimping tool used for a compression crimping pipe joint according to an embodiment of the present invention; FIG. FIG. 2 is a plan view showing a crimping die attached to a crimping tool used for a compression crimping pipe joint according to an embodiment of the present invention; FIG. 4 is a cross-sectional view showing a method of connecting a resin pipe to a compression crimping pipe joint according to an embodiment of the present invention using a crimping die attached to a crimping tool. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 schematically shows a ring-shaped member constituting a compression crimp pipe joint according to an embodiment of the present invention, where (a) is a plan view and (b) is a cross-sectional view taken along line AA of (a). BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 schematically shows a ring-shaped member constituting a compression crimp pipe joint according to an embodiment of the present invention, where (a) is a plan view and (b) is a cross-sectional view taken along line BB of (a).

[Compression crimp pipe joint]
A compression crimp pipe joint according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a compression crimped pipe joint according to one embodiment of the present invention, and is a cross-sectional view along the pipe axis direction of the compression crimped pipe joint.
The compression crimp pipe joint 10 shown in FIG. Note that FIG. 1 shows a state before the joint body 20 and the sleeve 30 are caulked.

The joint body 20 includes a hexagonal nut-shaped flange portion 21, a cylindrical externally threaded cylindrical portion 22 connected to one of the flange portions 21, and a cylindrical nozzle portion 23 connected to the other of the flange portions 21. Prepare.

As shown in FIG. 1 , the maximum outer diameter D1 of the nozzle portion 23 is smaller than the inner diameter D2 of the resin pipe 70 connected to the compression crimp pipe joint 10 . Further, the nozzle portion 23 has a sealing material fitting groove 23b formed along the entire circumference of the outer peripheral surface 23a of the nozzle portion 23 at the center portion in the pipe axial direction. Further, the nozzle portion 23 has an outer peripheral surface 23a that sandwiches the sealing material fitting groove 23b and is formed in a serrated uneven shape. Further, the nozzle portion 23 has a ring-shaped member fitting groove 23c extending over the entire circumference of the outer peripheral surface 23a of the nozzle portion 23 at a portion adjacent to the flange portion 21 .

The sleeve 30 includes a cylindrical sleeve body 31 and a circular flange 32 connected to one end of the sleeve body 31 . The sleeve 30 is arranged so as to surround the nozzle portion 23 . As shown in FIG. 1, the inner diameter D3 of the sleeve body 31 is substantially the same as or slightly larger than the outer diameter D4 of the resin pipe 70 . The other end of the sleeve body 31 is fitted and integrated with a fitting groove 21 a provided on the nozzle portion 23 side of the flange portion 21 of the joint body 20 . The circular flange 32 is provided so as to extend outward from one end of the sleeve body 31 .

The ring-shaped sealing material 40 is fitted in the sealing material fitting groove 23 b of the nozzle portion 23 . Further, the maximum height of the ring-shaped sealing material 40 from the bottom 23d of the sealing material fitting groove 23b in the fitted state to the sealing material fitting groove 23b is the same as that of the sealing material from the bottom 23d of the sealing material fitting groove 23b. It is formed so as to be lower than the height to the upper ends of both side walls of the fitting groove 23b. Furthermore, the ring-shaped sealing material 40 has a cross-sectional shape in an uncompressed state, a dimension in the thickness direction of the ring that is slightly smaller than the groove width of the sealing material fitting groove 23b, and a maximum height portion that extends in the thickness direction of the ring. It has a substantially semicylindrical shape slightly displaced from the center position (in the direction of the central axis) to the opposite side of the male threaded tubular portion 22 in the nozzle portion 23 . The ring-shaped sealing material 40 may be fitted in the sealing material fitting groove 23b via an adhesive disposed in the sealing material fitting groove 23b.

The ring-shaped member 50 has an annular shape in plan view. The ring-shaped member 50 is a flat packing or O-ring. The outer diameter D5 of the ring-shaped member 50 is smaller than the inner diameter D3 of the sleeve body 31 . The ring-shaped member 50 is arranged at a position where the resin pipe 70 abuts against the nozzle portion 23 . A portion of the ring-shaped member 50 is fitted in a ring-shaped member fitting groove 23c formed in the outer peripheral surface 23a of the nozzle portion 23 at the abutting position. As shown in FIG. 1, the ring-shaped member 50 is fitted in the ring-shaped member fitting groove 23c, and its outer edge protrudes from the ring-shaped member fitting groove 23c. Furthermore, the outer peripheral surface 50 a of the ring-shaped member 50 is in contact with the inner peripheral surface 31 a of the sleeve body 31 .

As shown in FIG. 1 , in the compression crimp pipe joint 10 , one end of the resin pipe 70 is inserted between the nozzle portion 23 and the sleeve 30 . By crimping the nozzle portion 23 and the sleeve 30 with one end portion of the resin pipe 70 inserted, the one end portion of the resin pipe 70 is watertightly sandwiched between the nozzle portion 23 and the sleeve 30 and fixed. . Also, one end surface (an end surface of the joint main body 20 on the side of the flange portion 21 ) 70 a of the resin pipe 70 inserted between the nozzle portion 23 and the sleeve 30 hits the outer edge of the ring-shaped member 50 .

The joint body 20 is made of brass, gunmetal, stainless steel, or the like.

The sleeve 30 is made of stainless steel, aluminum, or the like.

The ring-shaped sealing member 40 is made of synthetic rubber such as ethylene-propylene-diene copolymer (EPDM). The ring-shaped sealing material 40 is formed to elastically deform so that the compressibility is 5% to 65% when the resin pipe 70 is normally connected to the compression crimping pipe joint 10 .

The ring-shaped member 50 is made of stainless steel, aluminum, ethylene-propylene-diene copolymer (EPDM), synthetic rubber such as fluoride rubber (FKM), or the like.

In the compression crimping pipe joint 10 of this embodiment, for example, the sleeve 30 is crimped using a dedicated crimping die 110 shown in FIGS. 3 to 5 attached to a crimping tool 100 as shown in FIG.
As shown in FIGS. 3 to 5, the crimping die 110 is composed of two split dies 110a.
The two split dies 110a each have a crimping recess 111 having a substantially semi-cylindrical shape and butt surfaces 112 provided on both sides of the crimping recess 111. As shown in FIG.

The abutting surfaces 112 of the two split dies 110a have uneven shapes in which abutting convex surfaces 112a and abutting concave surfaces 112b are alternately formed in the axial direction. The two split dies 110a are such that the matching convex surface 112a of one split die 110a butts against the matching concave surface 112b of the other split die 110a.
On the inner wall surface of the caulking recess 111, three semi-circular caulking ridges 113 are provided in parallel. A corner portion of the caulking recess 111 including the caulking ridge 113 and the butting surface 112 is chamfered into a curved shape.

Each crimping projection 113 reaches a corner portion between the inner wall surface of the crimping recess 111 and the abutting convex surface 112a so as to follow both end edges of the projection 112c forming the abutting convex surface 112a and the inner edge of the end projection 112d. are provided as follows.
When the two split dies 110a are set in the crimping tool 100, the crimping ribs 113 of one split die 110a and the crimping ribs 113 of the other split die 110a are arranged in pairs. be done. In a state where the matching convex surface 112a and the matching concave surface 112b of the two split dies 110a are butted against each other, each pair of caulking ridges 113 is projected from the direction perpendicular to the axis of the caulking recess 111 (arrow X direction in FIG. 4). 5, both ends of the pair of crimping protrusions 113 overlap each other when viewed from the axial direction of the crimping recess 111 as shown in FIG. state. That is, it looks as if the crimping protrusions 113 forming a pair form a substantially circular shape. Also, the central pair of crimping ridges 113 are arranged at a position facing directly above the ring-shaped sealing material 40 during crimping.

Next, a method of connecting the resin pipe P to the compression crimping pipe joint 10 using the crimping die 110 attached to the crimping tool 100 will be described in detail with reference to FIG.

As shown in FIG. 6( a ), one end of the resin pipe 70 is inserted between the nozzle portion 23 and the sleeve 30 .
In the compression crimping pipe joint 10, the maximum outer diameter D1 of the nozzle portion 23 is smaller than the inner diameter D2 of the resin pipe 70, and the outer diameter D5 of the ring-shaped sealing material 40 is smaller than the diameter of the upper peripheral edge of the side wall of the sealing material fitting groove 23b. be. Therefore, in this inserted state, there is a gap between the resin pipe 70, the nozzle portion 23 and the ring-shaped sealing material 40, which will surely cause water leakage when a water pressure test is performed.

As shown in FIG. 6(a), the compression crimping pipe joint 10 into which the resin pipe 70 is inserted is sleeved between two split dies 110a (only one split die 110a is shown in FIG. 6(a)). The caulking tool 100 is arranged so that the main body 31 portion is sandwiched. After that, the lever 101 of the crimping tool 100 is operated to move one of the split dies 110a toward the other split die 110a, thereby crimping the sleeve body 31 as shown in FIG. 6(b).
By this crimping, the sleeve body 31 is crimped by the three pairs of crimping ribs 113 at the portion directly above the sealing material fitting groove 23b and the concave-convex shaped portion sandwiching the sealing material fitting groove 23b.

By crimping the sleeve 30 , the resin pipe 70 is deformed into a ring shape toward the nozzle portion 23 at a portion corresponding to the crimping ridge 113 . That is, as shown in FIG. 6B, a part of the resin pipe 70 on the inner wall surface side enters into the sealing material fitting groove 23b at a portion corresponding to the central pair of caulking ridges 113 to form a ring. The sealing material 40 is compressed and deformed so as to have a compression rate of 5% to 65%, thereby firmly water stopping. On the other hand, as shown in FIG. 6(b), a part of the inner wall surface side is cut into the concave-convex shaped portion sandwiching the sealing material fitting groove 23b between the portions corresponding to the two pairs of caulking ridges 113. Compressive deformation is performed to prevent the resin pipe 70 from coming off.

In the compression crimping pipe joint 10, as described above, the maximum outer diameter D1 of the nozzle portion 23 is smaller than the inner diameter D2 of the resin pipe 70, and the outer diameter D5 of the ring-shaped sealing member 40 is smaller than the side wall of the sealing member fitting groove 23b. Since the diameter is smaller than the diameter of the upper peripheral edge, in this inserted state, a gap is created between the resin pipe 70, the nozzle portion 23, and the ring-shaped seal member 40 to ensure water leakage when a water pressure test is performed. becomes.
Therefore, omission of crimping can be reliably discovered at the time of the initial water pressure test. Of course, if the caulking is performed normally, the resin pipe 70 will not come off and water will not leak from the connecting portion even after long-term use.

In addition, if the crimping die 110 is used for crimping, crimping can be performed with a light force, and no fold-shaped surplus portion is formed in the crimped portion, so that compression is not uneven in the circumferential direction. , the reliability of the joint against water leakage etc. is improved.
Moreover, in the compression crimping pipe joint 10, the outer diameter D5 of the ring-shaped sealing material 40 is smaller than the diameter of the upper peripheral edge of the side wall of the sealing material fitting groove 23b. The diameter must be reduced so that the inner wall of 70 enters the seal fitting groove 23b. That is, it is necessary to increase the amount of diameter reduction of the crimped portions of the sleeve 30 and the resin pipe 70 by crimping, but if the die 110 is used, the required large amount of diameter reduction can be sufficiently secured.

According to the compression crimping pipe joint 10 of the present embodiment, the ring-shaped member 50 is arranged at the position where the resin pipe 70 abuts against the nozzle portion 23 , and a part of the ring-shaped member 50 extends from the outer circumference of the nozzle portion 23 at the abutment position. It is fitted in a ring-shaped member fitting groove 23c formed in the surface 23a. Therefore, according to the compression crimp pipe joint 10, when the sleeve 30 is about to come off from the joint body 20 due to water pressure in a high-temperature environment, the sleeve 30 is caught by the ring-shaped member 50, making it difficult to come off, thereby maintaining watertightness. can do.

<Other embodiments>
In addition, this invention is not limited to said embodiment.

For example, a ring-shaped member 200 according to a modification as shown in FIG. 7 and a ring-shaped member 210 according to a modification as shown in FIG. 8 may be employed. In addition, in the ring-shaped members 200 and 210 according to the modified examples, the same reference numerals are given to the same parts as the constituent elements in the above-described embodiment, the description thereof is omitted, and only the different points will be described.

FIG. 7 schematically shows a ring-shaped member constituting a compression crimp pipe joint according to one embodiment of the present invention, (a) is a plan view, and (b) is a cross section along line AA of (a). It is a diagram.
A ring-shaped member 200 according to a modified example as shown in FIG. is chamfered. In this way, even if the adhesive placed between the ring-shaped sealing material 40 and the joint body 20 is softened in a high-temperature environment and the adhesive strength of the adhesive is lowered, the pipe can be crimped. The stress caused by the load in the direction perpendicular to the axis can be relieved by the ring-shaped member 200, and the separation of the ring-shaped seal material 40 from the joint body 20 due to the stress can be further suppressed.

FIG. 8 schematically shows a ring-shaped member constituting a compression crimp pipe joint according to one embodiment of the present invention, (a) is a plan view, and (b) is a cross section along line BB of (a). It is a diagram.
A ring-shaped member 210 according to a modification as shown in FIG. 7 is provided with a notch 211 in its thickness direction. In other words, ring-shaped member 210 has notch 211 extending from one surface (surface orthogonal to outer peripheral surface 210c of ring-shaped member 210) 210a to the other surface (surface orthogonal to outer peripheral surface 210c of ring-shaped member 210) 210b. is provided. Thereby, the ring-shaped member 210 has a C shape in a plan view. One surface 210a of the ring-shaped member 210 is a surface facing the flange portion 21 when the ring-shaped member 210 is fitted in the ring-shaped member fitting groove 23c. The other surface 210b of the ring-shaped member 210 is a surface facing away from the flange portion 21 when the ring-shaped member 210 is fitted in the ring-shaped member fitting groove 23c. In this way, even if the adhesive placed between the ring-shaped sealing material 40 and the joint body 20 is softened in a high-temperature environment and the adhesive strength of the adhesive is lowered, the pipe can be crimped. The stress caused by the load in the direction perpendicular to the axis can be relieved by the ring-shaped member 200, and the separation of the ring-shaped seal material 40 from the joint body 20 due to the stress can be further suppressed.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are merely examples of the present invention. Therefore, the present invention is not limited only to the configuration of the embodiment, and it is a matter of course that the present invention includes any changes in design without departing from the gist of the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if there is no particular description. In addition, when a plurality of examples and modifications are disclosed as the present invention in the embodiments, even if there is no particular description, possible combinations of configurations straddling these are included. It goes without saying that In addition, it goes without saying that the configurations depicted in the drawings are included even if they are not specifically described. Further, where the term "equal" is used, it is meant to include equivalents.

EXAMPLES The present invention will be described in more detail with reference to examples and comparative examples below, but the present invention is not limited to the following examples.

[Example]
As shown in FIG. 1, a compression crimping pipe joint in which a ring-shaped member having an outer diameter smaller than the inner diameter of the sleeve body is fitted in a ring-shaped member fitting groove formed on the outer peripheral surface side of the nozzle portion has the above-described The resin pipe was crimped and connected as shown.

[Comparative example]
A resin pipe was crimped and connected to a compression crimped pipe joint in the same manner as in Example except that the ring-shaped member was not fitted.

[Evaluation of heat resistance]
The heat resistance of the connection of the compression crimped pipe joint of the example and the resin pipe and the connection of the compression crimped pipe joint of the comparative example and the resin pipe were evaluated.
Regarding heat resistance, according to Fire and Disaster Management Agency Notification No. 19 "Standards for synthetic resin pipes and pipe fittings", fill water so that no air remains inside the resin pipe, etc., and apply water pressure of the maximum working pressure. The resin pipe and the like were heated while the water pressure was added, and the time required for the water pressure in the resin pipe to decrease was measured. Table 1 shows the results.

From the results in Table 1, it can be seen that a ring-shaped member having an outer diameter smaller than the inner diameter of the sleeve body is fitted into the ring-shaped member fitting groove formed on the outer peripheral surface side of the nozzle portion in the compression crimp pipe joint as in the example. It was found that the heat resistance was improved by coating.

10 compression caulking pipe joint 20 joint body 21 flange portion 22 male threaded cylinder portion 23 nozzle portion 23b sealing material fitting groove 23c ring-shaped member fitting groove 30 sleeve 31 sleeve body 32 circular flange 40 ring-shaped sealing material 50, 200, 210 ring Shaped member 70 Resin pipe 211 Notch

Claims (3)

A joint body having a nozzle portion provided at one end thereof, and a sleeve surrounding the nozzle portion,
One end of the resin pipe is inserted between the nozzle portion and the sleeve, and the one end portion of the resin pipe is inserted between the nozzle portion and the sleeve by crimping the nozzle portion and the sleeve. A compression crimp pipe joint for watertight sandwiching,
A ring-shaped member is disposed at a position where the resin pipe abuts against the nozzle portion, and a portion of the ring-shaped member is fitted into a fitting groove formed in an outer peripheral surface of the nozzle portion at the abutment position. , compression crimp fittings. 2. The compression crimp pipe joint according to claim 1, wherein a ridge on the side opposite to the nozzle portion is chamfered on the inner peripheral surface side of the ring-shaped member. 2. The compression crimp pipe joint according to claim 1, wherein the ring-shaped member has a notch in the thickness direction and has a C-shape in plan view.

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