JP2013124676A - Piping material and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping material in which the amount of use of a metal material can be decreased, the man-hour for piping can be reduced, and a metal intermediate layer at the end face of a composite pipe is prevented from being brought into contact with water flowing inside, and to provide a method for manufacturing the piping material for obtaining stable qualities in a connection state between the composite pipe part and a joint part without causing variation in the strength of the piping material due to an environment or human factors.SOLUTION: One end of a commercially available composite pipe 2 having an outer layer 2a and an inner layer 2b made of a thermoplastic resin and an intermediate layer 2c made of metal is enlarged to form a diameter expansion part 22; and in the composite pipe 2, the end of the diameter expansion part 22 is subjected to a collar-turning process to form a collar-turned part 23. A joint body 3a comprising a thermoplastic resin and constituting a joint 10 is injection-molded in such a manner that the collar-turned part 23 forms a part of a clip locking collar 12, and the joint body 3a is simultaneously fuse-bonded to the composite pipe 2.

Description

  The present invention relates to a pipe material in which a composite pipe and a joint used in a water / hot water supply pipe, a cold / hot water pipe for air conditioning or a hot water facility, and the like are integrated in advance, and a method for manufacturing the same.

As a pipe used for water supply / hot water supply piping, cold / hot water piping for heating / cooling, or hot water equipment, for example, the inner and outer layers are formed of a thermoplastic resin such as polyethylene, and the reinforcing layer is formed of a metal such as aluminum 3 Metal composite pipes (hereinafter referred to as “composite pipes”) composed of more than one layer are used.
Such composite pipes are conventionally made of other metals using pipe joints such as caulking joints (refer to Patent Document 1), one-touch joints (refer to Patent Document 2), and joints that tighten cap nuts (refer to Patent Document 3). It is designed to be connected to a piping material made of steel.

  Also, for the purpose of reducing manufacturing costs and saving resources, a plastic tube that can be plastically deformed, an annular spacer member that is fitted to the tip end side of the plastic tube, and a connecting member that is connected to the spacer member, And a convex portion is formed on the outer periphery of the plastic tube on the tip end side, and the spacer member has a connection recess formed on the inner periphery thereof, and the plastic tube is formed in the connection recess. A connection body of a pipe in which a convex portion is press-fitted has been proposed (see Patent Document 4).

JP 2007-285405 A Japanese Patent No. 41799919 JP-A-6-346994 JP 2009-197926 A

However, the pipe joint used for the conventional connection has one of the following problems because the joint body is formed of a metal material (mainly copper alloy) so as to withstand caulking and tightening.
(1) The cost is high due to fluctuations in metal prices, and the risk of stable supply is high.
(2) The weight increases.
(3) There is a risk of corrosion.
(4) Since the number of members constituting the joint is large and it is necessary to assemble them, man-hours and time are required for assembly, resulting in an increase in cost.
(5) There is a risk that a defective member may be used incorrectly during assembly, or that a product failure such as an assembly error may occur.
(6) Since the pipe joint is provided with a retaining structure and water stop structure, there is a problem that the entire pipe joint becomes large and piping in a narrow place cannot be performed.

On the other hand, as a connection method between the resin piping material and the resin piping material, there is a connection method using a butt fusion or an electric fusion joint in addition to the above mechanical connection method.
However, in the butt fusion, the end faces of the pipe materials to be joined are melted with a hot plate or the like, and the end faces are brought into contact with each other and joined. Therefore, in butt fusion, in the case of a composite pipe having a metal layer that does not melt in the reinforcing layer, surface pressure is applied to the molten resin when the pipe end face of another pipe material is pressed against the pipe end face of the composite pipe. It is difficult and cannot be fused well.
In the electric fusion joint, the outer surface of the pipe and the inner surface of the joint are generally fused. However, the outer layer of the composite pipe is thin, and a sufficient amount of molten resin cannot be secured. Further, there is a problem that the flattening of the tube, etc., it is difficult to melt uniformly in the circumferential direction, and it is difficult to apply a surface pressure, so that stable fusion strength cannot be expressed.

  In view of the above circumstances, the present invention can reduce the amount of metal material used, reduce the number of pipe construction man-hours, and contact the water flowing inside the metal reinforcing layer of the composite pipe end face. An object of the present invention is to provide a piping material that can be made stable and quality of the connection state between the composite pipe portion and the joint portion without causing variations in strength due to the environment or people. It is said.

  In order to achieve the above-mentioned object, the piping material according to the present invention projects into a flange shape in the outer peripheral direction on the insertion end of the insertion port inserted into the receiving port of the other piping material, and on the rear end side of the insertion port. A joint part having a clip locking bar extending in the shape of a bowl in the outer peripheral direction of the receiving port of another piping material and a clip locking bar locked by a clip member, and a pipe member provided continuously to the joint part A pipe member comprising a main body portion, wherein the joint portion has a joint main body portion made of at least a thermoplastic resin, and an inner layer made of thermoplastic resin and a metal reinforcing layer provided outside the inner layer An end portion of the composite pipe provided with a reversing processing portion, and the reversing processing portion is integrated with the joint main body portion, so that a part of the clip latching reed is It is characterized by being formed.

In the piping material of the present invention, it is preferable that the joint body and the composite pipe are fused at the interface.
That is, by adopting a fused structure, the joint body can be injection-molded and simultaneously the composite pipe and the joint body can be fused, and there is no need for bonding in a subsequent process, and productivity is good.

In the piping material of the present invention, it is preferable that the joint main body portion includes a reinforcing layer covering portion that covers the reinforcing layer of the turned processing portion in an exposed state on the outer surface side of the piping material.
That is, by providing the reinforcing layer covering portion, it is possible to prevent the reinforcing layer from being exposed to water and corroding the reinforcing layer.

Although the piping material of the present invention is not particularly limited, it is preferable that the joint portion is made of a material having higher strength than the joint main body portion and includes an incore that reinforces the joint main body portion from the inner peripheral side. .
For example, a sealing material is usually fitted to the outlet, and the sealing member is watertightly connected by inserting the opening into the receiving port. On the other hand, a reaction force received from the inner wall surface of the receiving port through the sealing material is applied to the differential port from the outer peripheral direction. Therefore, when the joint body part is formed of a soft thermoplastic resin, if the outlet is only the joint body part, it may be deformed inward by this reaction force, and water stoppage may not be ensured. By providing the in-core, it is possible to prevent the joint body portion from being deformed by the sealing material and prevent the water stop performance from deteriorating.

Although the piping material of the present invention is not particularly limited, it is preferable that at least a part of the joint main body is provided so as to close the gap between the in-core and the composite pipe.
That is, it can be set as the structure where an in-core does not detach | leave from a thermoplastic resin molding part.

Although the piping material of the present invention is not particularly limited, the composite pipe has a diameter-expanded portion obtained by expanding the pipe end portion of the composite pipe, and the turned-up processed portion is provided at the tip of the diameter-expanded portion. It is preferable that
In other words, when a mold is used in which the reversing part side is accommodated in the mold cavity and the remaining part of the composite tube that becomes the pipe body part comes out of the mold cavity, the thermoplastic resin molded part is expanded when injected. By locking the diameter portion to the cavity wall surface, the composite tube can be prevented from being pushed out to the tube portion side by the injection pressure, and a piping material having a long tube material body can be easily formed.

The larger the diameter-enlarged portion, the greater the prevention force of the retaining member, and the larger the inner diameter, but conversely, the outer diameter of the joint portion becomes larger, and the height of the clip locking rod ( The degree of diameter expansion depending on the composite pipe used as the raw material because there is a problem that the length of the joint part in the radial direction) is insufficient and the thickness of the diameter-expanded part may become thin and there may be a problem in strength. Is appropriately determined.
As a method for forming the enlarged diameter portion, it is desirable to form by inserting a mold core having the same shape as the inner surface of the tube after the diameter expansion into the inner surface of the tube. Furthermore, it is preferable that a split mold having the same shape as the outer surface of the pipe after substantially expanding the diameter is installed on the outside, the mold is tightened at the time of molding, and released and released after molding, so that the diameter can be increased with higher accuracy.
Depending on the material, it may be warmed because the stretch-molded appearance of the material is improved.

  In the pipe material manufacturing method of the present invention, the processed composite pipe is placed in the cavity in a state where the turnover processing part faces the cavity of the injection mold and the pipe body part is arranged outside the cavity. It is characterized by comprising a step of injection-filling injection resin and injection-molding the joint main body.

The composite pipe is not particularly limited as long as it has an inner layer made of thermoplastic resin and a metal reinforcing layer, but may have an outer layer made of thermoplastic resin surrounding the outside of the reinforcing layer. .
In the composite pipe including the inner layer and the outer layer, the inner layer and the outer layer may be formed of different thermoplastic resins. As a composite pipe having such an inner layer and an outer layer, for example, a pipe end portion of a commercially available composite pipe such as the product name ESLON Super Eslometax manufactured by Sekisui Chemical Co., Ltd. is turned over or expanded. It can be obtained by reverse turning.
Moreover, the inner layer and the outer layer may be a multilayer, or the inner layer and the outer layer may be formed of different thermoplastic resins.

  In the present invention, the resin forming the joint body is not particularly limited. For example, various materials can be selected depending on the usage environment (temperature, pressure, water quality, etc.) and the manufacturing conditions. It is desirable to select the same material as the inner layer in consideration of the fusion property with the inner layer.

  The in-core is not particularly limited, but is superior in strength to the joint body part, and is not particularly limited unless it is melted by the heat of the injection resin when the thermoplastic resin molded part is injection-molded.For example, a copper alloy such as gun metal, Examples thereof include metals such as stainless steel, engineering plastics such as PPS (polyphenylene sulfide) and PPSU (polyphenylsulfone), and composite materials obtained by mixing and dispersing reinforcing materials such as glass fibers in these engineering plastics.

  As described above, the piping material according to the present invention projects in a hook shape in the outer peripheral direction at the insertion end of the insertion port inserted into the receiving port of the other piping material, and the other piping. A joint portion having a clip latching rod projecting in a hook shape in the outer peripheral direction of the receiving port of the material, and a clip latching rod latched by the clip member, and a pipe body main body portion continuously provided to the joint portion, The joint portion has a joint body portion made of at least a thermoplastic resin, and includes an inner layer made of thermoplastic resin and a metal reinforcing layer provided outside the inner layer. An end portion of the composite pipe has a turn-up processing portion processed into a turn-up shape, and the turn-up processing portion is integrated with the joint main body portion so as to constitute a part of the clip locking hook. It can be used to reduce the amount of metal material used. And can be reduced joint part, it is possible to reduce the piping installation steps. Furthermore, since the metal reinforcing layer on the end face of the composite pipe does not come into contact with the water flowing inside, the reinforcing layer can be prevented from corroding and has excellent durability.

  On the other hand, in the method for manufacturing a piping material according to the present invention, at least the turn-up portion of the composite pipe faces the cavity of the injection mold, and the remaining portion is disposed outside the cavity, and the injection resin is placed in the cavity. The joint body is injection-filled, and the joint body is injection-molded, so the quality of the piping material and the joint part is stable without causing variations in strength due to the environment or people. It can be.

It is sectional drawing showing 1st Embodiment of the piping material concerning this invention. It is a perspective view explaining the connection method with the other piping material of the piping material of FIG. It is a perspective view explaining the state before mounting | wearing with a clip member in the junction part of the piping material of FIG. 1, and another piping material. It is a perspective view explaining the state after mounting | wearing with the clip member of FIG. FIG. 5 is a cross-sectional view of FIG. 4. It is sectional drawing explaining the manufacturing method of the piping material of FIG. It is sectional drawing showing 2nd Embodiment of the piping material concerning this invention.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 to 5 show a first embodiment of a piping material according to the present invention.

As shown in FIGS. 1 to 5, the piping material 1 a includes a joint part 10 and a pipe body main part 13.
The joint portion 10 includes a slot 11 and a clip locking rod 12.
The differential port 11 has an O-ring fitting groove 11b, and an O-ring 11a is fitted into the O-ring fitting groove 11b as a sealing material.

  Then, as shown in FIG. 6, the piping material 1 a is set in the mold 7 with the composite pipe 2 and the in-core 4 a constituting a part of the joint portion 10, which will be described in detail later. It is obtained by injecting resin to mold the joint body 3a.

That is, the composite pipe 2 is a commercially available composite pipe comprising an outer layer 2a, an inner layer 2b, and a reinforcing layer 2c (for example, trade name ESLON Super Ethromex manufactured by Sekisui Chemical Co., Ltd., the inner and outer layers are polyethylene resin, and the reinforcing layer is aluminum). The diameter-enlarged portion 22 obtained by processing one end portion of the diameter-enlarged portion and formed into a cylindrical shape, the turn-up processed portion 23 formed by turning the tip end portion of the enlarged-diameter portion 22, and the remaining portion The unprocessed part 21 used as the certain pipe material main-body part 13 is provided.
The length of the unprocessed portion 21 is appropriately determined according to the use of the piping material 1a. In the case of a long length, the unprocessed portion 21 may be wound in a roll shape.
In addition, as for the magnitude | size of the enlarged diameter part 22, when using the composite pipe (inner diameter (phi) 15.6 mm) of nominal diameter (phi) 16mm, the internal diameter of the enlarged diameter part 22 is although it does not specifically limit, About 17.6 mm is preferable.

  As shown in FIG. 6, the composite pipe 2 is configured so that the outer peripheral wall of the one end portion of the incore 4 a abuts the inner wall surface on the proximal end side of the enlarged diameter portion 22, and the incore 4 a constituting a part of the differential port 11. In a state where the other end portion is mounted so as to protrude from the turn-over processing portion 23 side of the composite tube 2, the turn-up processing portion 23 and the enlarged diameter portion 22 are set in the mold 7 together with the in-core 4 a.

In the mold closed state, as shown in FIG. 6, the outer peripheral wall surface on the proximal end side of the enlarged diameter portion 22 is received by the inner wall surfaces of the upper and lower molds 71 and 72 of the mold 7, and the unprocessed portion 21 is It will be in the state which protruded outside the type | mold 7. FIG.
In FIG. 6, 73 is a slide type that restricts the movement of the in-core 4a.

The in-core 4 a is formed in advance from a composite material in which, for example, PPS (polyphenylene sulfide) is mixed with 30% by weight of glass fiber as a reinforcing fiber, and includes a flange portion 41 and a cylindrical portion 42.
The cylindrical part 42 is provided with an uneven joint body engaging groove part 42a on the outer peripheral surface on the flange part 41 side.

As shown in FIG. 6, the joint body 3 a is formed in the space portion of the cavity 74 formed by setting the turn-over processed portion 23 and the enlarged diameter portion 22 of the composite pipe 2 and the in-core 4 a in the mold 7. It is formed by injection molding a thermoplastic resin that is substantially the same material as the inner layer 2b.
And the joint main-body part 3a is a fusion | fusion state over the inner-layer surface of the enlarged diameter part 22 of the composite pipe 2, and the reversing process part 23, and the circumferential direction all periphery of the joint main-body part 3a by injection molding as mentioned above. The reinforcing layer covering portion that covers the outer peripheral surface of the turn-up processed portion 23, that is, the end surfaces of the outer layer 2a, the inner layer 2b, and the reinforcing layer 2c, and is fused to the end surfaces of the outer layer 2a and the inner layer 2b. 31 is provided.
Therefore, the reinforcing layer 2 c is not exposed to the outside by the reinforcing layer covering portion 31.

In addition, this piping material 1a is connected as follows using the other piping material 5 which has the receiving port 52 and the clip latching hook part 51, and the clip member 6, as shown in FIGS. .
The clip member 6 is obtained by processing a stainless steel sheet metal, and includes an elastic locking portion 62 on both sides of a knob portion 61 having a U-shaped cross section, and the elastic locking portion 62 has a locking groove 63, 64 is drilled.
That is, as shown in FIG. 2, the slot 11 is arranged so as to face the opening of the receiving port 52, and the slot 11 is connected to the clip locking bar 12 and the clip locking bar 51 as shown in FIGS. Is inserted into the receiving port 52 until it substantially contacts.

Next, the clip member 6 is pushed in the direction of the arrow shown in FIG. 4 so that the clip locking bar 12 and the clip locking bar 51 fit into the locking grooves 63 and 64 of the both elastic locking parts 62.
That is, the piping material 1a and the other piping material 5 are engaged with the clip locking rod 12 and the clip locking rod portion 51 in the locking grooves 63 and 64 of the clip member 6 as described above. The wall surfaces of the clip locking bar 12 and the clip locking bar part 51 are locked by the inner wall surfaces of the grooves 63, 64, and the separation of the gap 11 from the receiving port 52 is prevented.

  Although not shown, the clip member 6 mounted as described above has both elastic locking portions 62 locked to the elastic locking portions 62 by locking the locking claws of the locking member for preventing detachment. The interval 62 is widened so as not to leave.

This piping material 1a is configured as described above and has the following excellent performance.
(1) Since the metal portion is only the reinforcing layer 2c portion of the composite tube 2, the amount of metal material used can be reduced.
(2) Since the joint part 10 and the pipe body main part 13 are integrated in advance, there is no need to connect the composite pipe to the joint at the site, and the number of pipes can be reduced and construction in a narrow place is possible. Excellent in properties. Also suitable for prefabrication.
(3) Since the pipe main body 13 is formed of a composite pipe, the pipe main body 13 can easily cope with bending near the joint 10.
(4) Since the pull-out force is received by the turn-over processed portion 23 provided with the metal reinforcing layer 2c of the composite pipe 2, the pull-out force generated in the pipe inner layer resin and the fused portion is small, and the long-term reliability of the connecting portion is improved. high.
(5) Since the composite pipe 2 and the joint body 3a are fused and integrated by injection molding of the joint body 3a, the temperature and pressure are higher than those of hot plate fusion or electric fusion. Stable, less affected by external environment (disturbance), and can secure stable fusion quality.
(6) Since the inner diameter of the joint portion 10 can be increased as compared with a connection structure using a conventional joint, the pressure loss can be reduced.
(7) Since the enlarged diameter portion 22 is provided and the enlarged diameter portion 22 is locked to the inner wall surface of the mold, the tube can be easily positioned and fixed at the time of injection molding without using a complicated structure. Can do.
(8) Since the joint body 3a is reinforced from the inner peripheral side by the in-core 4a made of a material having higher strength than the joint body 3a, the joint body even if the joint body 3a is formed of a soft thermoplastic resin. It can prevent that the part 3a deform | transforms with the load from an outer peripheral direction, and water-stopping performance deteriorates.
(9) Since the cylindrical portion 42 of the in-core 4a includes the joint main body engaging groove 42a, the in-core 4a and the joint main body 3a can be more firmly integrated.
(10) Since the inner layer surface of the enlarged diameter portion 22 and the turnover processing portion 23 of the composite pipe 2 and the entire circumference in the circumferential direction of the joint body portion 3a are fused, the reinforcing layer 2c flows inside the piping material 1a. There is no risk of corrosion by touching the fluid.
(11) Since the reinforcing layer 2c is not exposed even on the outer surface side by the strong layer covering portion 31 of the joint body 3a, even if the outside of the piping material 1a is exposed to rainwater or the like, the reinforcing layer 2c Will not be corroded.

FIG. 7 shows a second embodiment of the piping material according to the present invention.
As shown in FIG. 7, the piping material 1b is the same as the piping material 1a, except as described in detail below. Therefore, the same components as the piping material 1a are denoted by the same reference numerals as the piping material 1a.

That is, this piping material 1b is a joint body portion that is molded in a fused state with the composite pipe 2 after the composite pipe 2 is set in the mold, the incore 4b is not set, and the joint body portion 3b is injection molded. The cylindrical portion 43 of the in-core 4b is fitted to the tip portion of 3b later, and the reaction force from the inner peripheral surface of the receiving port 52 is inserted through the O-ring 11a in a state where the insertion port 11 is inserted into the receiving port 52. Therefore, the narrow portion of the O-ring fitting groove 11b portion and the vicinity of the O-ring fitting groove 11b that are most likely to be loaded from the outside is reinforced from the inside by the cylindrical portion 43 of the in-core 4b.
This piping material 1b is as described above, and in addition to the effects of the piping material 1a, the incore 4b can be small, so that the material cost can be reduced.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the opening is provided only on one side of the pipe portion, but the opening may be provided in the same manner on both sides of the pipe portion.
In the above embodiment, the composite pipe includes the outer layer, but the outer layer may not be provided.

In the above-described embodiment, the enlarged diameter portion has a cylindrical shape, but the diameter may be increased to a truncated cone shape.
In the above embodiment, the processed composite pipe has an enlarged diameter part. However, the pipe part is short, and the structure that allows the entire processed composite pipe to be accommodated in the mold and the end face of the pipe part can be easily suppressed. As long as it can be configured to prevent detachment from the mold, the enlarged diameter portion may not be provided.

1a, 1b Piping material 10 Joint part 11 Port 11a O-ring (ring-shaped seal material)
12 clip locking rod 13 pipe body portion 2 processed composite tube 21 unprocessed portion 22 enlarged diameter portion 23 turn-up processed portion 2a outer layer 2b inner layer 2c reinforcing layer 3a, 3b joint body portion 31 reinforcing layer covering portion 4a, 4b in-core 5 and others Piping material 51 Clip locking rod (other piping material)
52 Receptacle 6 Clip member 7 Mold 71 Upper mold 72 Lower mold 73 Slide mold 74 Cavity

Claims (8)

An outlet inserted into the receiving port of another piping material, and a flange extending in the outer peripheral direction on the rear end side of the insertion of the connecting port, and extending like a hook in the outer peripheral direction of the receiving port of the other piping material A joint part having a clip locking bar to be locked together with a clip locking bar to be locked by the clip member;
A pipe body provided continuously with the joint, and a piping material comprising:
The joint has a joint body made of at least a thermoplastic resin;
An end portion of a composite pipe provided with an inner layer made of thermoplastic resin and a metal reinforcing layer provided on the outer side of the inner layer has a turnover processing portion processed into a turnover shape;
The piping material, wherein the turn-up processed portion is formed so as to be integrated with the joint main body portion and constitute a part of the clip locking rod.   The piping material according to claim 1, wherein the joint body and the composite pipe are fused at the interface.   The piping material according to claim 1 or 2, wherein the composite pipe includes an outer layer made of a thermoplastic resin surrounding an outer side of the reinforcing layer.   The piping material according to any one of claims 1 to 3, wherein the joint main body portion includes a reinforcing layer covering portion that covers the reinforcing layer of the turned processing portion on the outer surface side of the piping material in an unexposed state.   The piping material according to any one of claims 1 to 4, wherein the joint portion is made of a material having higher strength than the joint main body portion and includes an in-core that reinforces the joint main body portion from the inner peripheral side.   The piping material according to claim 5, wherein at least a part of the joint main body portion is provided so as to closely fill a gap between the in-core and the composite pipe.   The said composite pipe | tube has an enlarged diameter part which diameter-expanded the pipe end part, The said turning process part is provided in the front-end | tip of this enlarged diameter part. Piping material.   At least the reversing portion of the composite pipe faces the cavity of the injection mold, and the remaining portion is disposed outside the cavity, and injection resin is injected and filled into the cavity to injection-mold the joint body portion. The method for manufacturing a piping material according to any one of claims 1 to 7, further comprising a step.