WO2021260858A1 - Joint de tuyau et procédé de couplage - Google Patents

Joint de tuyau et procédé de couplage Download PDF

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Publication number
WO2021260858A1
WO2021260858A1 PCT/JP2020/024877 JP2020024877W WO2021260858A1 WO 2021260858 A1 WO2021260858 A1 WO 2021260858A1 JP 2020024877 W JP2020024877 W JP 2020024877W WO 2021260858 A1 WO2021260858 A1 WO 2021260858A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
nut member
free end
joint body
peripheral surface
Prior art date
Application number
PCT/JP2020/024877
Other languages
English (en)
Japanese (ja)
Inventor
寛 黒須
敏充 鈴木
Original Assignee
イハラサイエンス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by イハラサイエンス株式会社 filed Critical イハラサイエンス株式会社
Priority to PCT/JP2020/024877 priority Critical patent/WO2021260858A1/fr
Publication of WO2021260858A1 publication Critical patent/WO2021260858A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
    • F16L19/028—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/04—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts using additional rigid rings, sealing directly on at least one pipe end, which is flared either before or during the making of the connection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/22—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts

Definitions

  • Resin tubes such as Teflon are used for tubes used for chemicals that cannot use metal materials and for devices that must not generate metal ions in the fluid used.
  • the joints that connect the above are also made of resin.
  • a pipe joint made of a relatively soft material such as resin has a low yield point as a material characteristic, so that a creep phenomenon is likely to occur, and stress relaxation caused by this may cause leakage. For this reason, when a pipe joint made of resin or the like is used, regular retightening is required in order to maintain airtightness.
  • the main object of the present invention is to make the pipe joint exhibit a self-sealing function so that permanent airtightness can be maintained without periodic retightening. It is something to do.
  • the pipe joint according to the present invention includes a joint body in which a tube insertion port is formed, and a nut member that is externally fitted to the joint body along the insertion direction of the tube, and is a free end of the insertion port. The portion is narrowed down by tightening the nut member.
  • the self-sealing function can be exerted between the free end portion and the tube. .. Specifically, even if stress relaxation of the nut member occurs due to the creep phenomenon and the tube moves in the pull-out direction, the tube is pressed against the free end portion and the free end portion is pressed against the nut member. Airtightness with the free end is maintained. In this way, by exerting the self-sealing function between the tube and the free end portion, it is possible to realize permanent airtightness maintenance without periodical retightening.
  • an insert member provided inside the tip of the tube and for pressing the tube against the free end.
  • the nut member In order to narrow down the free end without difficulty, the nut member has a tapered surface formed on its inner peripheral surface that gradually expands in diameter toward the insertion direction, and the free end is tightened by tightening the nut member. It is preferable that the portion is narrowed down along the tapered surface.
  • the pipe joint according to the present invention includes a joint body in which a tube insertion port is formed, and a nut member externally fitted to the joint body along the insertion direction of the tube, and a fluid flowing in the tube.
  • the outer peripheral surface of the tube is pressed against the inner peripheral surface of the joint body forming the insertion port by the pressure of the tube, so that the airtightness between the outer peripheral surface and the inner peripheral surface is maintained. It is characterized by being done. With such a configuration, the self-sealing function can be exerted between the outer peripheral surface of the tube and the inner peripheral surface of the joint body, and permanent airtightness can be maintained without regular retightening. can do.
  • FIG. 1 An exploded sectional view of a pipe fitting according to an embodiment of the present invention.
  • the cross-sectional view which shows the connection state of the pipe joint in the same embodiment.
  • the cross-sectional view for demonstrating the connection procedure of the pipe joint in the same embodiment.
  • Sectional drawing of the pipe fitting in other embodiments Sectional drawing of the pipe fitting in other embodiments.
  • the pipe joint 100 of the present embodiment is connected to, for example, a resin tube T used for a chemical solution that cannot use a metal material, a device that must not generate metal ions in a fluid used, or the like. As shown in FIG. 1, it includes a joint body 10 in which the insertion port 10a of the tube T is formed, and a nut member 20 screwed into the joint body 10.
  • the joint body 10 Like the tube T, the joint body 10 is made of resin, for example, and as shown in FIGS. 1 and 2, the tube T is inserted and connected from at least one side in the pipe axial direction.
  • the direction in which the tube T is inserted is referred to as the insertion direction, and the opposite direction is referred to as the exit direction.
  • the joint body 10 is formed with, for example, a linear internal flow path L having the same diameter as the inner diameter of the tube T, and the tube T is inserted from one side in the pipe axial direction and the other in the pipe axial direction.
  • the side is connected to a port of a fluid device or the like or another tube T.
  • the joint body 10 is formed with a linear internal flow path L, in which the tube T is inserted from both one side and the other side in the pipe axis direction, and a T-shaped or L-shaped internal flow.
  • a path L is formed, and various types can be used, for example, a tube T is inserted from a direction orthogonal to the tube axis direction.
  • the diameter dimension of the internal flow path L is not limited to the above-mentioned one, and may be appropriately changed.
  • the insertion port 10a formed in the joint body 10 has a larger diameter than the internal flow path L, and a step portion 11 is formed on the inner peripheral surface of the joint body 10.
  • An insert member 30, which will be described later, is provided on the step portion 11.
  • the free end portion 12 of the insertion port 10a has a thin wall shape having an outer diameter smaller than that of the free end portion 12 in the insertion direction side, and in a state where the nut member 20 is not tightened to the joint body 10, For example, it has a thin cylindrical shape.
  • the shape of the free end portion 12 is not limited to a thin-walled cylindrical shape, and may be, for example, a thin-walled truncated cone shape.
  • the nut member 20 is made of a material that can cause a creep phenomenon, and specifically, is made of a resin that can relieve the tightening stress on the joint body 10.
  • the end portion of the nut member 20 on the pull-out direction side is formed as a tapered surface 22 whose inner peripheral surface gradually expands in diameter toward the insertion direction.
  • the pipe joint 100 of the present embodiment is configured such that the free end portion 12 of the insertion port 10a is narrowed down by tightening the nut member 20 to the joint main body 10.
  • a diameter-expanded portion T1 having an expanded inner diameter is formed at the tip portion (end portion in the insertion direction).
  • the diameter-expanded portion T1 does not have to be formed at the time of manufacturing the tube T, and may be formed before the tube T is inserted into the joint body 10.
  • the diameter-reduced free end portion 12 as described above is interposed between the outer peripheral surface T2 of the diameter-expanded portion T1 of the tube T and the tapered surface 22 of the nut member 20. ..
  • the insert member 30 is arranged on a step portion 11 formed on the inner peripheral surface of the joint body 10, and the movement in the insertion direction is restricted and the movement in the removal direction is permitted.
  • the insert member 30 has a cylindrical shape, for example, and the insertion direction side is arranged in the step portion 11 without play, and the insertion direction side is formed to have a smaller outer diameter than the insertion direction side.
  • an annular space 30a is formed between the outer peripheral surface of the insert member 30 on the exit direction side and the inner peripheral surface of the joint body 10, and the annular space 30a is formed.
  • the enlarged diameter portion T1 of the tube T is fitted.
  • the insert member 30 is made of resin as in the tube T, the joint body 10, and the nut member 20.
  • the insert member 30 is inserted into the joint body 10.
  • the tube T is inserted into the insertion port 10a of the joint body 10, and the enlarged diameter portion T1 formed at the tip of the tube T is inserted into the outer peripheral surface of the insert member 30 and the joint body. It is fitted into the annular space 30a formed between the inner peripheral surface of 10 and the inner peripheral surface of 10.
  • the nut member 20 is screwed and tightened to the joint body 10, and as described above, the nut member 20 is inserted by the tapered surface 22 formed on the inner peripheral surface of the nut member 20.
  • the free end portion 12 of the mouth 10a is narrowed down so as to reduce the diameter, and the self-sealing function described below is exhibited between the outer peripheral surface T2 of the enlarged diameter portion T1 of the tube T and the inner peripheral surface of the free end portion 12.
  • This self-sealing function is a function for ensuring the airtightness between the joint body 10 and the tube T without retightening the nut member 20, and is the following principle (phenomenon) using the pressure of the fluid flowing in the tube T. Is realized by.
  • the insert member 30 presses the enlarged diameter portion T1 of the tube T against the inner peripheral surface of the free end portion 12, while the outer peripheral surface of the free end portion 12 is displaced by the tapered surface 22 of the nut member 20 in the pulling direction. Since the movement is restricted, as a result, the airtightness between the outer peripheral surface T2 of the enlarged diameter portion T1 of the tube T and the inner peripheral surface of the free end portion 12 is maintained.
  • the free end portion 12 is interposed between the nut member 20 and the tube T, it is possible to prevent the tube T from rotating when the nut member 20 is tightened, and when the tube T is assembled. Can be protected from damage.
  • the insert member 30 is provided in the enlarged diameter portion T1 of the tube T so that the movement is restricted in the insertion direction and the movement is permitted in the removal direction, if the nut member 20 becomes loose, the nut member 20 is loosened.
  • the insert member 30 moves in the pull-out direction, and the enlarged diameter portion T1 of the tube T can be reliably pressed against the free end portion 12, so that the self-sealing function can be more reliably exerted.
  • the insert member 30 tends to move in the pull-out direction due to the pressure of the fluid, the self-sealing function can be exhibited with a simple configuration using the pressure of the fluid.
  • the present invention is not limited to the above embodiment.
  • the diameter-expanded portion T1 of the tube T is formed on the pull-out direction side of the embodiment, the diameter-expanded portion T1 is formed without arranging the insert member 30 on the step portion 11. It may be provided inside.
  • the enlarged diameter portion T1 of the tube T may be folded outward as shown in FIG.
  • the insert member 30 in this case may be arranged so as to be wrapped in the folded diameter-expanded portion T1.
  • the insert member 30 may be, for example, an annular one.
  • the pipe joint 100 does not necessarily have to include the insert member 30. Specifically, for example, as shown in FIGS. 7 and 8, if an annular space 10b into which the enlarged diameter portion T1 of the tube T is inserted is formed in the joint body 10, the enlarged diameter portion T1 is provided in the annular space 10b. It may be inserted and the nut member 20 may be tightened.
  • the enlarged diameter portion T1 may be inserted into the annular space 10b formed in the joint body 10 in a state where the enlarged diameter portion T1 is folded outward or inward.
  • the joint body 10 of the above embodiment has a free end portion 12 and other portions integrally molded, but for example, the free end portion 12 is used as a separate member from the other portions. It may be provided as a part of the joint body 10 by welding to another member or fastening via a fastening member.
  • the inner peripheral surface of the free end portion 12 does not necessarily have to be a flat surface, and may be, for example, a curved surface convex on the inner peripheral side or a curved surface convex on the outer peripheral side.
  • the joint body 10, the nut member 20, and the insert member 30 do not necessarily have to be entirely made of resin, and at least the portion with which the fluid comes into contact may be made of resin.
  • a metal or ceramics may be provided inside the joint body 10, the nut member 20, or the insert member 30.
  • the procedure for connecting the pipe joint 100 and the tube T described in the above embodiment is merely an example.
  • the diameter of the free end portion 12 is reduced in advance. You can leave it.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)

Abstract

La présente invention a pour objet de réaliser le maintien d'une étanchéité permanente à l'air sans serrage supplémentaire périodique en amenant un joint de tuyau à présenter une fonction d'autoétanchéité. À cette fin, la présente invention porte sur un joint de tuyau qui comprend un corps de joint (10) dans lequel est formé un orifice d'insertion (10a) d'un tube (T), et un élément d'écrou (20) équipé, à l'extérieur, du corps de joint (10) le long d'une direction d'insertion du tube (T). Une extrémité libre (12) de l'orifice d'insertion (10a) est étranglée par serrage de l'élément d'écrou (20).
PCT/JP2020/024877 2020-06-24 2020-06-24 Joint de tuyau et procédé de couplage WO2021260858A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/024877 WO2021260858A1 (fr) 2020-06-24 2020-06-24 Joint de tuyau et procédé de couplage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/024877 WO2021260858A1 (fr) 2020-06-24 2020-06-24 Joint de tuyau et procédé de couplage

Publications (1)

Publication Number Publication Date
WO2021260858A1 true WO2021260858A1 (fr) 2021-12-30

Family

ID=79282095

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/024877 WO2021260858A1 (fr) 2020-06-24 2020-06-24 Joint de tuyau et procédé de couplage

Country Status (1)

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WO (1) WO2021260858A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4512698Y1 (fr) * 1966-08-25 1970-06-02
JPS62110093A (ja) * 1985-11-08 1987-05-21 株式会社　潤工社 管継手
JP2001248768A (ja) * 2000-03-02 2001-09-14 Advance Denki Kogyo Kk プラスチックチューブの継ぎ手構造
JP2010025136A (ja) * 2008-07-15 2010-02-04 Advance Denki Kogyo Kk 樹脂製チューブの継ぎ手構造
JP2012163132A (ja) * 2011-02-04 2012-08-30 Flowell Corp チューブ継手

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4512698Y1 (fr) * 1966-08-25 1970-06-02
JPS62110093A (ja) * 1985-11-08 1987-05-21 株式会社　潤工社 管継手
JP2001248768A (ja) * 2000-03-02 2001-09-14 Advance Denki Kogyo Kk プラスチックチューブの継ぎ手構造
JP2010025136A (ja) * 2008-07-15 2010-02-04 Advance Denki Kogyo Kk 樹脂製チューブの継ぎ手構造
JP2012163132A (ja) * 2011-02-04 2012-08-30 Flowell Corp チューブ継手

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