JP2008001022A - Method for connecting pipe and apparatus for connecting pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a practical method for connecting pipes capable of instantaneously melting and solidifying connecting faces without requiring a special joint material and requiring no adhesive and seal tape, and an apparatus for connecting the pipes. <P>SOLUTION: The pipes 1 such gas pipes and sewage pipes are formed of, for example, a high density polyethylene synthetic resin material. These pipes 1 have the same inner diameters and outer diameters. At first, opening end faces of two pipes 1 and 1 are processed orthogonally to the longitudinal direction (the length direction of the pipes) and both pipes 1 and 1 are butted. Then, while a compressive stress is applied on these butted faces, the butted part of both pipes 1 and 1 are irradiated with an energy beam 2 from the outside to connect both pipes 1 and 1 together. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a joining method and joining apparatus for two pipes, and more particularly to a joining method and joining apparatus for two pipes made of a thermoplastic synthetic resin material, for example, a polyethylene synthetic resin material. It is.

  Conventionally, the pipes are joined by the following method. That is, there is a method of joining the fitting part with an adhesive using a joint material having an inner diameter that matches the outer diameter of the pipe to be joined first, but a joint material that ensures fitting accuracy is required. Since an adhesive is used, man-hours such as time to fix and management are required, and sufficient adhesive strength cannot be ensured.

  Also, using a joint material having an inner diameter that matches the outer diameter of the pipe to be joined, screws are fixed to the screw holes formed in the joint material and both pipes, and the fluid flowing in the pipe is further fixed. Although it joins using a sealing tape so that it may not leak from this screwing part, work and time are required for screw processing, and a sealing tape is also needed.

In addition, using a joint material that has an inner diameter that matches the outer diameter of the pipe to be joined and in which heating wires are embedded in advance, and after fitting the pipes to be joined to the joint material, A method of welding a joint material and a pipe with an electric wire is also known (see, for example, Patent Document 1). In this case, a special joint material such as embedding a heating wire in advance is required, and there is a problem of high cost.
Japanese Patent Publication No. 8-30048

  Therefore, the present invention provides a practical pipe joining method and pipe joining apparatus that can instantaneously melt and solidify the joining surface without requiring a special joint material and do not require an adhesive or a sealing tape. With the goal.

  For this reason, the first invention is a method for joining two pipes made of a thermoplastic synthetic resin material, but the whole or part of the opening side end portions of both pipes are butted together and an energy beam is applied to the butting portion. Irradiated to join both pipes.

  A second invention is a method for joining two pipes made of a thermoplastic synthetic resin material, with butting all or part of the opening side end portions of both pipes and applying compressive stress to the butted portions. It is characterized in that both pipes are joined by irradiating an energy beam.

  The third invention is a method of joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, and processing the open end faces of both pipes at right angles to the longitudinal direction, but abutting both pipes, Both pipes are joined by irradiating the abutting portion with an energy beam while applying a compressive stress to the abutting surface.

  A fourth invention is a method of joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, and is opened so that the open end faces of both pipes are opened from the inner diameter side toward the outer diameter side. Both pipes are abutted with each other, and a compressive stress is applied to the abutting portion, and an energy beam is applied to the groove surface to join both pipes.

  A fifth invention is a method for joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, and a filler having a high transmittance with respect to the wavelength of an energy beam for welding between both pipes. It is characterized in that both pipes are joined by irradiating the energy beam to the butt portion of both pipes and the filler while interposing and applying compressive stress.

  A sixth invention is a method for joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, wherein all or part of the open end faces of both pipes are directed from the inner diameter side to the outer diameter side. Both pipes are butt-processed so as to open, and both pipes are applied while applying compressive stress with a filler having a high transmittance with respect to the wavelength of the energy beam for welding to the unbutted portions of both pipes. Both the pipes are joined by irradiating the energy beam to the butt portion of the filler.

  A seventh invention is a method for joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, and opens the entire open end face of one pipe from the inner diameter side to the outer diameter side. The groove is processed so that the outer end of the opening end surface of the other pipe is opened from the inner diameter side toward the outer diameter side, and the inner end portion of the opening end surface is closed from the outer diameter side toward the inner diameter side. In this way, the groove is processed so that the one pipe is fitted to the other pipe, and a filler having a high transmittance with respect to the wavelength of the energy beam to be welded to the non-fitted part of both pipes is interposed. Then, both pipes are joined by irradiating the energy beam to the butted portion of both pipes and the filler while applying compressive stress.

  An eighth invention is a method for joining two pipes made of thermoplastic synthetic resin materials having different inner diameters, wherein one pipe is fitted with the other pipe, and the fitting portion is irradiated with an energy beam. The two pipes are joined together.

  A ninth invention is a method for joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, wherein the outer peripheral portion is cut off at the joining side end of one pipe to make it thinner. Cut the inner circumference at the joint end of the pipe to make it thin, mate one pipe with the other pipe and butt it, and irradiate the butt part with an energy beam while applying compressive stress to the butt face It is characterized by joining both pipes.

  A tenth invention is a method of joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, wherein the outer peripheral portion is cut off at the joining side end of one pipe to make it thinner. A cylindrical shape having a high transmittance with respect to the wavelength of the energy beam for cutting and thinning the inner peripheral portion at the joint side end of the pipe, and welding both pipes to the thin part at the joint side end of the one pipe. A filler is fitted from the outside, one pipe is fitted to the other pipe via this filler, and the two pipes are irradiated with the energy beam while applying compressive stress to both pipes. It is characterized by joining.

  An eleventh aspect of the invention is a method for joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, wherein half halves of the joining side end portions of both pipes are cut off, The remaining half halves are butted together, and an energy beam is applied to the butted portion while compressive stress is applied to join both pipes.

  According to a twelfth aspect of the invention related to any one of the first to eleventh pipe joining methods, the two pipes have a roughness that allows an energy beam to permeate into end faces to be joined.

  A thirteenth aspect of the present invention is the invention relating to any one of the first to eleventh pipe joining methods, wherein a plurality of the energy beam oscillation sources are arranged on a circumference at a predetermined distance from the both pipes, It is characterized by irradiating an energy beam.

  A fourteenth aspect of the invention relates to an energy beam oscillation source according to the invention relating to any one of the first to eleventh pipe joining methods, wherein a plurality of optical elements are arranged on the circumference at a predetermined distance from the two pipes. The energy beam is guided to each optical element via each optical fiber and irradiated with the energy beam.

  A fifteenth aspect of the present invention is the invention relating to any one of the first to eleventh pipe joining methods, wherein a waveguide is disposed on the circumference at a predetermined distance from the two pipes, and energy beam oscillation is provided in the waveguide. An energy beam from a source is guided, and the energy beam is irradiated to the waveguide through an opening opened at a predetermined interval.

  A sixteenth aspect of the invention relates to any one of the first to eleventh pipe joining methods, wherein the energy beam is emitted from an energy beam oscillation source that moves at a predetermined speed around the pipes at a predetermined distance. Irradiating.

  According to a seventeenth aspect of the invention related to any one of the first to eleventh pipe joining methods, an antioxidant gas is applied to the irradiated portion of the energy beam in order to prevent oxidation of the melted portion due to the irradiation of the energy beam. It is characterized by supplying.

  An eighteenth aspect of the invention is a joining device for two pipes made of a thermoplastic synthetic resin material, and is a circle separated by a predetermined distance from a butted portion where all or a part of the opening side end portions of both pipes are butted. A plurality of energy beam oscillation sources are arranged on the circumference, and the abutting portion is irradiated with an energy beam.

  A nineteenth aspect of the present invention is a joining device for two pipes made of a thermoplastic synthetic resin material, and is a circle separated by a predetermined distance from a butted portion that butts all or part of the opening side end portions of both pipes. A plurality of optical elements disposed on the circumference, an energy beam oscillation source that emits an energy beam, and an energy beam from the energy beam oscillation source that is provided corresponding to the optical element is guided to the optical elements. A plurality of fibers for irradiating the butted portion are provided.

  A twentieth aspect of the invention is a joining apparatus for two pipes made of a thermoplastic synthetic resin material, and is a circle separated by a predetermined distance from a butted portion that butts all or part of the opening side end portions of both pipes. A waveguide disposed on the circumference and an energy beam oscillation source that emits an energy beam, guides the energy beam from the energy beam oscillation source to the waveguide, and each of a plurality of openings provided in the waveguide The energy beam is irradiated to the abutting portion through a gap.

  A twenty-first aspect of the present invention is a joining apparatus for two pipes made of a thermoplastic synthetic resin material, and is separated by a predetermined distance around a butting portion where all or part of the opening side end portions of both pipes are butted. An energy beam oscillation source that moves at a predetermined speed is provided, and the abutting portion is irradiated with the energy beam from the energy beam oscillation source.

  It is possible to provide a practical pipe joining method and joining apparatus that can instantaneously melt and solidify a joining surface without requiring a special joint material and does not require an adhesive or a seal tape.

  Hereinafter, embodiments of the present invention will be described. 1st Embodiment of the joining method of a pipe is described based on FIG. First, reference numeral 1 denotes a pipe such as a gas pipe or a water and sewage pipe, which is made of a thermoplastic synthetic resin, specifically, a polyolefin-based synthetic resin, for example, a polyethylene synthetic resin material in this embodiment.

  The pipe 1 is made of a thermoplastic synthetic resin material such as a vinyl chloride resin, an acrylic resin, or a polyethylene resin. Generally, a medium density polyethylene synthetic resin material is used for a gas pipe and a water and sewer pipe. A high-density polyethylene synthetic resin material is used.

  The pipe 1 has the same inner diameter and outer diameter. First, the opening end surfaces of the two pipes 1 and 1 are machined at right angles to the longitudinal direction (pipe length direction), and both pipes 1 and 1 are brought into contact with each other. Then, while applying compressive stress to the butted surfaces, the butted portions of both pipes 1 and 1 are irradiated with energy beam 2 from the outside to join both pipes 1 and 1 together. This irradiation is devised so that it is made substantially uniform over the entire circumference of the butted portion.

  The energy beam 2 is a laser beam, and the laser oscillation source may be a semiconductor laser, a fiber laser, a YAG laser, or the like.

  According to the first embodiment of the pipe joining method, since the absorption coefficient of each pipe 1 with respect to the laser is constant, the energy beam 2 is transmitted also in the depth direction, and at the same time, absorption is performed and heat is generated. As a result, the groove surface is heated and melted, and at the same time, the melted synthetic resin materials are mixed by the compressive stress applied to the pipes 1 and 1. In this mixed state, the irradiation of the energy beam 2 is stopped, and the melted portion is cooled by supplying the assist gas.

  This assist gas is nitrogen gas or a mixed gas such as nitrogen and argon in order to prevent or reduce oxidation, and at the same time as cooling the melted portion, prevents the melted portion from being oxidized, and the transmission optical system and laser oscillation source. There is also a protective effect.

  Next, a second embodiment will be described based on FIGS. First, the same or similar numbers as those in the first embodiment will be described below assuming that they have the same or similar functions. In the second embodiment, a groove is formed so that the opening end surfaces of both pipes 1 and 1 cut at right angles to the longitudinal direction (pipe length direction) are opened from the inner diameter side toward the outer diameter side. In this method, both pipes 1 and 1 are butted (see FIG. 2), and the pipes 1 and 1 are joined by irradiating the groove surfaces 1A and 1A with the energy beam 2 while applying compressive stress to the butted portion. This irradiation is devised so that it is made evenly over the entire circumference of the groove surfaces 1A and 1A.

  The groove angle obtained by opening the opening end faces of the pipes 1 and 1 from the inner diameter side toward the outer diameter side is about several degrees to several tens of degrees. As shown in FIG. When the melting starts and the viscosity increases due to irradiation, the melted portions 1B and 1B are crushed by the compressive stress, and integration starts from the abutting portion, resulting in the state of FIGS.

  Then, the integration proceeds toward the outside of the groove surface, and eventually, as shown in FIG. In this state, the irradiation of the energy beam 2 is stopped, and the melted portions 1B and 1B are cooled by supplying the assist gas.

  Next, a third embodiment will be described based on FIG. First, the same or similar numbers as those in the first embodiment will be described below assuming that they have the same or similar functions. In the third embodiment, both pipes 1, 1 are applied with compression stress applied by sandwiching a cylindrical filler 3 having a high transmittance with respect to the wavelength of the energy beam 2 for welding between the pipes 1, 1. And the abutting portion of the filler 3 is irradiated with the energy beam 2 to join the pipes 1 and 1 together. This irradiation is devised so that it is made substantially uniform over the entire circumference of the butted portion.

  That is, the opening end face of the pipes 1 and 1 is processed at right angles to the longitudinal direction (pipe length direction), and a cylindrical filler 3 having the same diameter as the pipes 1 and 1 is interposed between the pipes 1 and 1. The energy beam 2 is irradiated to the butted portion of the pipes 1 and 1 and the filler 3 while applying compression stress by sandwiching them.

  In this case, in order to irradiate the groove surface with the energy beam 2, irradiation is performed obliquely from above as indicated by an arrow in FIG. The filler 3 has a sufficiently high transmittance with respect to the energy beam 2 and is excellent in weldability with the pipes 1 and 1, and a material having excellent mechanical properties and chemical properties is selected. Similar to the pipes 1 and 1, it is made of a synthetic resin, specifically, a polyolefin-based synthetic resin, for example, a high-density polyethylene synthetic resin material.

  In some cases, a functional material such as an absorbent may be sandwiched between the filler 3 and the pipes 1 and 1 or applied to the contact surface between the filler 3 and the pipes 1 and 1. Thereby, absorption to the pipe and filler of energy beam 2 is promoted. As this absorbent, it is desirable to use a paste coated with a metal powder such as carbon powder or nickel powder, but if the absorption rate is high, the same synthesis as the filler 3 and pipes 1 and 1 is used. Resin material may be used.

  Then, absorption is performed at the same time as the irradiation with the energy beam 2, and the butt portion between the filler 3 and the pipes 1, 1 is melted by generating heat, and at the same time, the filler 3 and the pipes 1, 1 are melted by compressive stress. The synthetic resin materials thus mixed will be mixed. In this mixed state, the irradiation of the energy beam 2 is stopped, and as described above, the melted portion is cooled by supplying the assist gas.

  Next, a fourth embodiment will be described based on FIG. First, the same or similar numbers as those in the first embodiment will be described below assuming that they have the same or similar functions. In the fourth embodiment, the pipes 1 and 1 are abutted to open the entire opening end surfaces of the pipes 1 and 1 from the inner diameter side toward the outer diameter side, and the pipes 1 and 1 are brought into contact with each other. The cross section having a high transmittance with respect to the wavelength of the energy beam 2 to be welded to the unmatched portion of the pipe is abutting between the pipes 1 and 1 and the filler 3A while applying a compressive stress by interposing a triangular ring-shaped filler 3A. In this method, both the pipes 1 and 1 are joined by irradiating the energy beam 2 to the part. This irradiation is devised so that it is made substantially uniform over the entire circumference of the butted portion.

  The filler 3A is a ring having a triangular cross section, and fills the space formed by groove processing so that all of the open end faces of the pipes 1 and 1 are opened from the inner diameter side toward the outer diameter side. Fitted.

  Then, the energy beam 2 is irradiated to the entire filler 3A (including the butt portion between the filler 3A and the pipes 1 and 1) and absorption is performed at the same time, and the filler 3A itself, the filler 3A and the pipes 1 and 1 are absorbed. At the same time that the butted portion melts by generating heat, the synthetic resin material in which the filler 3A and the pipes 1 and 1 are melted is mixed by compressive stress. In this mixed state, the irradiation of the energy beam 2 is stopped, and as described above, the melted portion is cooled by supplying the assist gas.

  Next, a fifth embodiment will be described with reference to FIG. First, the same or similar numbers as those in the first embodiment will be described below assuming that they have the same or similar functions. In the fifth embodiment, the pipes 1 and 1 are butted together so as to open a part of the opening end surfaces of the pipes 1 and 1 from the inner diameter side toward the outer diameter side, and the pipes 1 and 2 are abutted. The cross section having a high transmittance with respect to the wavelength of the energy beam 2 for welding to the unmatched portion of 1 has a triangular ring-shaped filler 3B, and compresses the pipes 1, 1 and the filler 3B while applying compressive stress. In this method, both the pipes 1 and 1 are joined by irradiating the butted portion with the energy beam 2. This irradiation is devised so that it is made substantially uniform over the entire circumference of the butted portion.

  The filler 3B is a ring having a triangular cross section, and fills a space formed by groove processing so that a part of the opening end face of both pipes 1 and 1 is opened from the inner diameter side toward the outer diameter side. Is fitted.

  Then, the energy beam 2 is irradiated to the entire filler 3B (including the butt portion between the filler 3B and the pipes 1 and 1) and is absorbed at the same time. The filler 3B itself, the filler 3B and the pipes 1 and 1 are absorbed. At the same time that the butted portion melts by generating heat, the synthetic resin material in which the filler 3B and the pipes 1 and 1 are melted is mixed by compressive stress. In this mixed state, the irradiation of the energy beam 2 is stopped, and as described above, the melted portion is cooled by supplying the assist gas.

  Next, a sixth embodiment will be described based on FIG. First, the same or similar numbers as those in the first embodiment will be described below assuming that they have the same or similar functions. In the sixth embodiment, a groove is formed so that the entire opening end surface of one (right) pipe 1 is opened from the inner diameter side toward the outer diameter side, and the opening end surface of the other (left) pipe 1 is opened. The left pipe is grooved so that the outer end is opened from the inner diameter side toward the outer diameter side and the inner end of the opening end surface is closed from the outer diameter side toward the inner diameter side. A part of the right pipe 1 is fitted to 1 and the cross section having a high transmittance with respect to the wavelength of the energy beam 2 for welding to the unfitted part of the pipes 1 and 1 is a ring shape having a triangular shape. This is a method of joining the pipes 1 and 1 by irradiating the energy beam 2 to the butted portion of both the pipes 1 and 1 and the filler 3C while applying compressive stress with the filler 3C. This irradiation is devised so that it is made substantially uniform over the entire circumference of the butted portion.

  The filler 3C is a ring having a triangular cross section, and is fitted so as to fill a space formed by groove processing so as to open toward the outer diameter side of the opening end faces of the pipes 1 and 1.

  Then, the energy beam 2 is applied to the entire filler 3C (including the butt portion between the filler 3C and the pipes 1 and 1) and is absorbed at the same time. The filler 3C itself, the filler 3C and the pipes 1 and 1 are absorbed. At the same time that the butt portion melts by generating heat, the filler 3C and the synthetic resin materials in which the pipes 1 and 1 are melted are mixed with each other by compressive stress. In this mixed state, the irradiation of the energy beam 2 is stopped, and as described above, the melted portion is cooled by supplying the assist gas.

  In addition, according to the above fourth to sixth embodiments, the functional material such as the absorbent described in the third embodiment is sandwiched between the filler and the pipes 1 and 1, or the filler and the pipe 1 and It may be applied to one contact surface. Thereby, absorption to the pipe and filler of energy beam 2 is promoted.

  Next, a seventh embodiment will be described based on FIG. First, the same or similar numbers as those in the first embodiment will be described below assuming that they have the same or similar functions. This seventh embodiment is a method of joining two pipes 10, 11 made of a synthetic resin, specifically, a polyolefin-based synthetic resin, for example, made of a high-density polyethylene synthetic resin material and having different inner diameters. is there.

  That is, one (right) pipe 10 and the other (left) pipe 11 whose outer diameter is slightly smaller (substantially the same diameter) than the inner diameter of the pipe 10 are provided. In this method, the other (left) pipe 11 is fitted, and the fitting part is irradiated with the energy beam 2 to join the pipes 10 and 11 together. This irradiation is devised so that it is made substantially uniform over the entire circumference of the fitting portion.

  And absorption is performed by irradiation of the energy beam 2, and when the fitting portion A is heated and melted by generating heat, the melted synthetic resin materials are mixed together. In this mixed state, the irradiation of the energy beam 2 is stopped, and the melted portion is cooled by supplying the assist gas.

  Next, an eighth embodiment will be described based on FIG. First, the same or similar numbers as those in the first embodiment will be described below assuming that they have the same or similar functions. The eighth embodiment is a method of joining two pipes 1 and 1 having the same inner diameter and outer shape. First, the outer peripheral portion is cut off over the entire circumference at the joining side end portion of one (left side) pipe 1 to form a fitting portion 1C, and the joining side end of the other (right side) pipe 1 is joined. The inner peripheral portion is cut out over the entire circumference to form a thin portion to form the fitted portion 1D.

  Then, the fitting part 1C of one pipe 1 is fitted to the fitted part 1D of the other pipe 1 and abutted, and the energy beam 2 is irradiated to the abutting part while applying a compressive stress to the abutting surface. 1 and 1 are joined. This irradiation is devised so that it is made substantially uniform over the entire circumference of the butted portion.

  Then, absorption is performed by irradiation of the energy beam 2, and when the heat is generated, the fitting portion is heated and melted, and at the same time, the melted synthetic resin materials are mixed. In this mixed state, the irradiation of the energy beam 2 is stopped, and the melted portion is cooled by supplying the assist gas.

  Next, a ninth embodiment will be described with reference to FIG. First, the same or similar numbers as those in the first embodiment will be described below assuming that they have the same or similar functions. The ninth embodiment is a method for joining two pipes 1 and 1 having the same inner diameter and outer shape. First, the outer peripheral portion is cut off over the entire circumference at the joining side end portion of one (left side) pipe 1 to form a fitting portion 1C, and the joining side end of the other (right side) pipe 1 is joined. The inner peripheral portion is cut out over the entire circumference to make it thinner, thereby forming the fitted portion 1E. In this case, the length of the fitted portion 1E is shorter than the fitting portion 1C.

  Then, a cylindrical filler 3D having a high transmittance with respect to the wavelength of the energy beam 2 for welding the pipes 1 and 1 to the fitting part 1C at the joint side end of the one pipe 1 is fitted from the outside, The fitting portion 1C of one pipe 1 is fitted to the fitting portion 1E of the other pipe 1 through this filler 3D and abutted, and both pipes 1, 1 are sandwiched with the filler 3D sandwiched while applying compressive stress. The energy beam 2 is irradiated to the butted portion of the filler 3D to join the pipes 1 and 1 together. This irradiation is devised so that it is made substantially uniform over the entire circumference of the butted portion.

  Then, absorption is performed at the same time when the energy beam 2 is irradiated, and the butt portion between the filler 3D and the pipes 1 and 1 is melted by generating heat, and at the same time, the filler 3D and the pipes 1 and 1 are melted by compressive stress. The synthetic resin materials thus mixed will be mixed. In this mixed state, the irradiation of the energy beam 2 is stopped, and as described above, the melted portion is cooled by supplying the assist gas.

  Next, a tenth embodiment will be described based on FIG. First, the same or similar numbers as those in the first embodiment will be described below assuming that they have the same or similar functions. The tenth embodiment is a method of joining two pipes 1 and 1 having the same inner diameter and outer shape.

  First, one half (upper half) is cut by a certain length at the joining side end of one (left) pipe 1, and only a certain length is cut at the joining side end of the other pipe (right) 1. Cut out one half (lower half). The remaining half halves of the pipes 1 and 1 are butted together, and the pipes 1 and 1 are joined by irradiating the energy beam 2 while applying compressive stress to the butted parts 1F and 1F. This irradiation is devised so that it is made substantially uniform over the entire circumference of the butted portion.

  Then, absorption is performed at the same time as the irradiation with the energy beam 2, and the butted portions of both pipes 1, 1 are melted by generating heat, and at the same time, the melted synthetic resin materials are mixed by compressive stress. In this mixed state, the irradiation of the energy beam 2 is stopped, and as described above, the melted portion is cooled by supplying the assist gas.

  Next, a method for irradiating the energy beam 2 will be described with reference to FIGS. First, based on FIG. 14, the example which applied the 1st irradiation method to 1st Embodiment of the joining method of the pipe mentioned above is demonstrated.

  First, the energy beam oscillation source 5 is disposed at a substantially equal interval on the circumference at a predetermined distance from both the pipes 1 and 1 (its abutting portion) so that the welding quality is uniform.

  In this method, the energy beams 2 from the energy beam oscillation source 5 are uniformly distributed to the both pipes 1 and 1 (its abutting portion) so that the both pipes 1 and 1 (its abutting portion) can be uniformly irradiated. A plurality of energy beam oscillation sources 5 are arranged at substantially equal intervals on the circumference at a predetermined distance.

  The energy beam oscillation source 5 may be a semiconductor laser, a fiber laser, a YAG laser, or the like.

  Next, an example in which the second irradiation method is applied to the first embodiment of the pipe joining method described above will be described with reference to FIG.

  First, a lens 15 that is an optical element is disposed on the circumference at a predetermined distance from the pipes 1 and 1 at a substantially equal interval. Then, the energy beam 2 from an energy beam oscillation source (not shown) is guided to each lens 15 through each optical fiber 16 to irradiate the energy beam 2.

  In this method, the energy beams 2 from the energy beam oscillation source are uniformly distributed to both the pipes 1 and 1 (its butt portion) so that they can be uniformly irradiated to the both pipes 1 and 1 (its butt portion). The lenses 15 are arranged at substantially equal intervals on the circumference at a distance, and the energy beam 2 from the energy beam oscillation source is guided to the lenses 15 via the optical fibers 16.

  Next, an example in which the third irradiation method is applied to the first embodiment of the pipe joining method described above will be described with reference to FIG. First, a waveguide 20 which is an optical element is arranged on the circumference at a predetermined distance from both the pipes 1 and 1, and an energy beam 2 from an energy beam oscillation source 5 is guided to the waveguide 20. This is a method of irradiating the energy beam 2 through an opening 21 opened at a predetermined interval 20.

  The waveguide 20 is formed of an optical material such as optical glass having a cylindrical shape and an inner surface coated with a metal material that reflects the energy beam 2.

  Therefore, the energy beam 2 from the energy beam oscillation source 5 is guided to the waveguide 20 and can be uniformly and uniformly irradiated to the pipes 1 and 1 (its abutting portion) through the openings 21.

  Next, an example in which the fourth irradiation method is applied to the first embodiment of the pipe joining method described above will be described with reference to FIG. First, a plurality of energy beam oscillation sources 5 are arranged on the circumference at a predetermined distance from the pipes 1 and 1 (its abutting portion) at a substantially equal interval.

  Then, the energy beam 2 is irradiated while moving each energy beam oscillation source 5 at a predetermined speed with the pipes 1 and 1 being separated by a predetermined distance. Thereby, the said both pipes 1 and 1 (its butt | matching part) can be irradiated uniformly evenly.

  In addition, the 1st thru | or 4th irradiation method demonstrated above is applicable not only to 1st Embodiment but 2nd thru | or 7th Embodiment.

  Further, in the above embodiment, the end surfaces where the pipes 1, 10, 11 are joined are formed with a roughness that allows the energy beam 2 to penetrate (rough average having a roughness of about 10 to 100 μm in diameter). To do. As a result, the area irradiated with the energy beam 2 can be increased, melt mixing can be facilitated, and the bonding can be made stronger.

  In the first to sixth embodiments, the outer diameter of the pipe 1 is 50 mm and the inner diameter is 40 mm. When the pipe 1 is softened and welded by about 3 mm from the butt end portion, the joining becomes sufficient.

In this case, the melting point of the pipe 1 made of polyethylene synthetic resin material is 165 ° C., the specific gravity is 0.91, the specific heat is 0.41, and the volume to be melted is (2.5 × 2.5 × π × 0.3). Is a value obtained by subtracting (2 × 2 × π × 0.3) from approximately 2.12 cm ³ . The energy required for melting is 2.12 (volume) × 165 (temperature to be raised) × 0.41 (specific heat) ÷ 4.2 (1 cal = 4.2 joules), which is 34.15 joules.

  Assuming that uniform heating is possible and that the absorption rate of energy into the pipe is 100%, use of a laser oscillation source of about 40 w enables melting in one second. However, since heat diffusion into the interior is not taken into consideration, it is considered that a power of about 80 to 1000 W is necessary in consideration of the absorption rate and the non-uniformity of the heat source.

  As described above, the present invention is a method for joining two pipes made of a thermoplastic synthetic resin material, but a part or both of the opening side end parts of both pipes are butted together, and compressive stress is applied to the butted parts. While both pipes are joined by irradiating the energy beam while being added, in this case, depending on the structure and method of butt, the energy beam may be radiated without applying compressive stress to the butt.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various alternatives described above without departing from the spirit of the present invention. It includes modifications or variations.

It is a front view of both pipes which can be partially broken for explaining a 1st embodiment of a joining method of pipes. It is a vertical front view of both pipes for demonstrating 2nd Embodiment of the joining method of a pipe. It is the elements on larger scale of FIG. 2 for demonstrating the change by irradiation of an energy beam. FIG. 3 is a partially enlarged view of FIG. 2 for showing a change caused by irradiation with an energy beam. FIG. 3 is a partially enlarged view of FIG. 2 for showing a change caused by irradiation with an energy beam. It is a front view of both the pipes which can be partially broken for demonstrating 3rd Embodiment of the joining method of a pipe. It is a front view of both the pipes which can be partially broken for demonstrating 4th Embodiment of the joining method of a pipe. It is a front view of both the pipes which can be partly broken for demonstrating 5th Embodiment of the joining method of a pipe. It is a front view of both the pipes which can be partly broken for demonstrating 6th Embodiment of the joining method of a pipe. It is a front view of both pipes which can be partly broken for explaining a 7th embodiment of a joining method of pipes. It is a vertical front view of both pipes for demonstrating 8th Embodiment of the joining method of a pipe. It is a vertical front view of both pipes for demonstrating 9th Embodiment of the joining method of a pipe. It is a perspective view of both the pipes for demonstrating 10th Embodiment of the joining method of a pipe. It is a figure for demonstrating the 1st irradiation method. It is a figure for demonstrating the 2nd irradiation method. It is a figure for demonstrating the 3rd irradiation method. It is a figure for demonstrating the 4th irradiation method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe 1A Groove 1B Melting part 2 Energy beam 3 Filler 3A Filler 3B Filler 3C Filler 5 Energy beam oscillation source 10, 11 Pipe 15 Lens 16 Optical fiber 20 Waveguide 21 Opening

Claims (21)

  A method for joining two pipes made of a thermoplastic synthetic resin material, where all or part of the opening side end portions of both pipes are butted together and an energy beam is irradiated to this butted portion to join both pipes A pipe joining method characterized by the above.   A method for joining two pipes made of a thermoplastic synthetic resin material, where all or part of the opening side end portions of both pipes are butted and irradiated with an energy beam while applying compressive stress to the butting portions. A pipe joining method characterized by joining both pipes.   A method of joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, processing the open end faces of both pipes at right angles to the longitudinal direction, butting both pipes, and compressing stress on the butting faces A method of joining pipes, characterized in that both pipes are joined by irradiating an energy beam to the butted portion while applying a pressure.   A method for joining two pipes made of a thermoplastic synthetic resin material having the same diameter part, and both pipes are processed by beveling so that the opening end faces of both pipes open from the inner diameter side toward the outer diameter side. And joining both pipes by irradiating the groove surface with an energy beam while applying compressive stress to the butted portion.   A method for joining two pipes made of a thermoplastic synthetic resin material having the same diameter, and is compressed by inserting a filler having a high transmittance with respect to the wavelength of the energy beam for welding between the two pipes. A method for joining pipes, wherein the pipes are joined by irradiating the energy beam to a butted portion between both pipes and the filler while applying stress.   A method of joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, and a groove that opens all or part of the open end faces of both pipes from the inner diameter side to the outer diameter side. Both pipes are processed to butt, and a filler having a high transmittance with respect to the wavelength of the energy beam for welding to the non-butted portions of both pipes is interposed between the two pipes and the butt portion of the filler while applying compressive stress. A method of joining pipes, wherein both pipes are joined by irradiating the energy beam.   A method of joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, with a groove working so that the entire open end face of one pipe is opened from the inner diameter side toward the outer diameter side. The groove is processed so that the outer end of the opening end face of the other pipe is opened from the inner diameter side toward the outer diameter side, and the inner end of the opening end face is closed from the outer diameter side toward the inner diameter side. The one pipe is fitted to the other pipe, and a compressive stress is applied by interposing a filler having a high transmittance with respect to the wavelength of the energy beam for welding to a portion where both the pipes are not fitted. A joining method of pipes characterized in that both pipes are joined by irradiating the energy beam to a butted portion between both pipes and the filler.   A method for joining two pipes made of thermoplastic synthetic resin materials having different inner diameters, in which one pipe is fitted into the other pipe and the fitting part is irradiated with an energy beam to join the two pipes. A pipe joining method characterized by the above.   A method for joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, wherein the outer peripheral portion is cut off at the joining side end of one pipe, and the joining side end of the other pipe is made. Cut the inner peripheral part of the part to make it thin, and fit one pipe into the other pipe and butt it together, irradiate the butt part with an energy beam while applying compressive stress to join both pipes A method of joining pipes characterized by the above.   A method for joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, wherein the outer peripheral portion is cut off at the joining side end of one pipe, and the joining side end of the other pipe is made. Cut the inner peripheral part of the pipe to make it thin, and fit a cylindrical filler from the outside with high transmittance to the wavelength of the energy beam to weld both pipes to the thin part at the joint end of the one pipe Then, one pipe is fitted to the other pipe through the filler and butted together, and both pipes are joined by irradiating the energy beam to the butt portion of the two pipes and the filler while applying compressive stress. Pipe joining method.   A method of joining two pipes made of a thermoplastic synthetic resin material having the same diameter portion, by cutting off half of the joint ends of both pipes and leaving the remaining half of both pipes A method of joining pipes characterized in that the pipes are joined to each other and irradiated with an energy beam while applying compressive stress to the butt part.   The pipe joining method according to any one of claims 1 to 11, wherein the two pipes have a roughness that allows an energy beam to permeate into end faces to be joined.   The pipe according to any one of claims 1 to 11, wherein a plurality of the energy beam oscillation sources are arranged on a circumference at a predetermined distance from the both pipes, and the energy beam is irradiated. Joining method.   A plurality of optical elements are arranged on the circumference at a predetermined distance from both pipes, and an energy beam from an energy beam oscillation source is guided to each optical element via each optical fiber to irradiate the energy beam. The method for joining pipes according to any one of claims 1 to 11, wherein:   A waveguide is arranged on the circumference at a predetermined distance from both the pipes, an energy beam from an energy beam oscillation source is guided to the waveguide, and an opening is provided in the waveguide at a predetermined interval. 12. The pipe joining method according to claim 1, wherein the energy beam is irradiated.   The pipe joining method according to any one of claims 1 to 11, wherein the energy beam is irradiated from an energy beam oscillation source that moves at a predetermined speed around the pipes at a predetermined distance. .   The pipe joining method according to any one of claims 1 to 11, wherein an antioxidant gas is supplied to the irradiated portion of the energy beam in order to prevent oxidation of the melted portion due to the irradiation of the energy beam. .   A joining device for two pipes made of a thermoplastic synthetic resin material, wherein a plurality of energies are arranged on the circumference at a predetermined distance from a butted portion where all or part of the opening side end portions of both pipes are butted. An apparatus for joining pipes, characterized in that a beam oscillation source is provided and an energy beam is irradiated to the butted portion.   An apparatus for joining two pipes made of a thermoplastic synthetic resin material, which is disposed on the circumference at a predetermined distance from a butted portion where all or part of the opening-side end portions of both pipes are butted. A plurality of optical elements, an energy beam oscillation source that emits an energy beam, and an energy beam from the energy beam oscillation source that is provided corresponding to the optical element and irradiates the abutting portion A pipe joining apparatus characterized by comprising a plurality of fibers.   An apparatus for joining two pipes made of a thermoplastic synthetic resin material, which is disposed on the circumference at a predetermined distance from a butted portion where all or part of the opening-side end portions of both pipes are butted. A waveguide and an energy beam oscillation source for emitting an energy beam, the energy beam from the energy beam oscillation source is guided to the waveguide, and the butt portion is formed through a plurality of openings provided in the waveguide. A pipe joining apparatus, wherein the energy beam is irradiated on the pipe.   An apparatus for joining two pipes made of a thermoplastic synthetic resin material, at a predetermined speed with a predetermined distance around the butted portion where all or part of the opening side ends of both pipes are butted An apparatus for joining pipes, wherein a moving energy beam oscillation source is provided, and the energy beam from the energy beam oscillation source is irradiated to the butting portion.

Images