Abstract: A cylindrical shaped circumferential rib is integrally formed as a base protruding on the outer circumferential surface of a resin pipe. An annular sealant is externally fitted on one end portion of a metal member which is inserted in and fixed to the base to interpose the sealant between the one end portion and the inner circumferential surface of the base, allow the outer circumferential surface of the one end portion to press and restrict the movement of the sealant toward the inner side in the radial direction and toward the trailing end side of the one end portion in the insertion direction, and allow the inner circumferential surface of the base to press and restrict the movement of the sealant toward the outer side in the radial direction and toward the insertion direction distal end side of the one end portion.

Abstract: A metal flange having unevenness on a surface of an insertion hole is disposed in an insert portion in a cavity body of a mold. A resin pipe is formed by curing molten resin injected into a cavity. The metal flange is fitted to a fixing groove continuous over an entire circumference of an outer circumferential surface of the pipe in a circumferential direction. An outer circumferential surface of the fixing groove enters the unevenness on the surface of the insertion hole. A circumferential rib is formed on at least one side of both ends of the flange in a longitudinal direction of the resin pipe, abuts on an end surface of the flange, has a diameter larger than an outer diameter of the pipe, and is continuous over the entire circumference of the outer circumferential surface of the pipe in the circumferential direction.

Abstract: A production method and device for a curved resin pipe via resin injection molding that uses an assist material. An inner curve part and/or an outer curve part of a pre-selected curved section of a cavity which is formed in a mold is configured from a temperature-adjustable piece section. After molten resin is injected into the cavity from an injection molding device, the temperature of the piece section is controlled by a control unit such that the inner curve part has a lower temperature than the outer curve part, and an assist material is injected into the cavity from an assist material injection unit and is passed through the cavity so as to form a pipe path. The resin remaining in the cavity is cured to produce a curved resin pipe.

Abstract: Provided is a piping system for an air conditioner installed in a vehicle that can achieve appropriate weight reduction while ensuring appropriate pressure resistance as the piping system as a whole. A circulation path that connects component devices of an air conditioner (8) in an annular shape to circulate a refrigerant (C) is formed by each pipe body extending between the component devices. At least one of the pipe bodies includes: a resin hose (2) embedded with a non-metal reinforcing material (3f) or a resin pipe (5) embedded with a non-metal reinforcing material (6f), and the resin pipe bodies (2), (5) are employed in 50% or more of a total length of each of the pipe bodies constituting the circulation path.

Abstract: Provided is a piping system for an air conditioner installed in a vehicle that can achieve appropriate weight reduction while ensuring appropriate pressure resistance as the piping system as a whole. A circulation path that connects component devices of an air conditioner (8) in an annular shape to circulate a refrigerant (C) is formed by each pipe body extending between the component devices. At least one of the pipe bodies includes: a resin hose (2) embedded with a non-metal reinforcing material (3f) or a resin pipe (5) embedded with a non-metal reinforcing material (6f), and the resin pipe bodies (2), (5) are employed in 50% or more of a total length of each of the pipe bodies constituting the circulation path.

Abstract: A holding portion having a diameter larger than that of a cavity is formed in communication with the cavity, in an area of a two-part type mold, the area including a portion corresponding to an annular groove. Subsequently, an insert member formed in a cylindrical shape and provided with, on an outer circumferential surface, the annular groove having no step in a groove surface is fitted to the holding portion, and then the mold is closed. On an inner circumferential surface of the insert member, a surface treatment layer having a surface roughness rougher than those of other portions of the insert member is formed. Molten resin is injected into the cavity; thereafter, an assist material is injected into the cavity to mold the resin into a desired pipe body. Then, the insert member and the pipe body are integrated along with curing of the resin.

Abstract: Two molded articles having a cylindrical two-piece split shape is formed by forming two primary cavities in a desired shape with molds assembled together and injecting a molten primary resin into the two primary cavities. An assist material is injected into a secondary cavity into which a molten secondary resin is injected in a state where the two molded articles are located opposed to each other via a space therebetween and internally fitted into one secondary cavity formed by the molds that are assembled together by shifting the positions. A flange portion having any desired shape is disposed on an outer circumferential surface of a resin pipe in a two-layer structure in which an inner surface layer formed of the cured secondary resin is integrated with an outer surface layer formed of the two molded articles. Thus, a portion having any desired shape is easily manufactured on the resin pipe.

Abstract: Two molded articles having a cylindrical two-piece split shape is formed by forming two primary cavities in a desired shape with molds assembled together and injecting a molten primary resin into the two primary cavities. An assist material is injected into a secondary cavity into which a molten secondary resin is injected in a state where the two molded articles are located opposed to each other via a space therebetween and internally fitted into one secondary cavity formed by the molds that are assembled together by shifting the positions. A flange portion having any desired shape is disposed on an outer circumferential surface of a resin pipe in a two-layer structure in which an inner surface layer formed of the cured secondary resin is integrated with an outer surface layer formed of the two molded articles. Thus, a portion having any desired shape is easily manufactured on the resin pipe.

Abstract: A holding portion having a diameter larger than that of a cavity is formed in communication with the cavity, in an area of a two-part type mold, the area including a portion corresponding to an annular groove. Subsequently, an insert member formed in a cylindrical shape and provided with, on an outer circumferential surface, the annular groove having no step in a groove surface is fitted to the holding portion, and then the mold is closed. On an inner circumferential surface of the insert member, a surface treatment layer having a surface roughness rougher than those of other portions of the insert member is formed. Molten resin is injected into the cavity; thereafter, an assist material is injected into the cavity to mold the resin into a desired pipe body. Then, the insert member and the pipe body are integrated along with curing of the resin.