WO2014013994A1 - Organe d'accouplement et ensemble d'accouplement - Google Patents

Organe d'accouplement et ensemble d'accouplement Download PDF

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Publication number
WO2014013994A1
WO2014013994A1 PCT/JP2013/069318 JP2013069318W WO2014013994A1 WO 2014013994 A1 WO2014013994 A1 WO 2014013994A1 JP 2013069318 W JP2013069318 W JP 2013069318W WO 2014013994 A1 WO2014013994 A1 WO 2014013994A1
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WO
WIPO (PCT)
Prior art keywords
ring
tube
nut
main body
joint
Prior art date
Application number
PCT/JP2013/069318
Other languages
English (en)
Japanese (ja)
Inventor
西尾　清志
今村　均
英樹 河野
安行 山口
Original Assignee
ダイキン工業株式会社
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 ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to KR1020157002380A priority Critical patent/KR101634507B1/ko
Priority to JP2014525828A priority patent/JP5961692B2/ja
Publication of WO2014013994A1 publication Critical patent/WO2014013994A1/fr

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    • 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
    • F16L33/24—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with parts screwed directly on or into the hose
    • 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
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/04—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe
    • F16L47/041—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe the plastic pipe end being 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
    • 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
    • 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
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/04—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with a swivel nut or collar engaging the pipe

Definitions

  • the present invention relates to a joint and a joint assembly.
  • Patent Document 1 Japanese Patent Laid-Open No. 2009-144916
  • a tube joint that can be firmly connected so that fluid that passes through the tube does not leak has been proposed.
  • an outer diameter size of a tube to which a tube joint is attached sizes of 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, and 1 inch are proposed.
  • a fixing ring is provided between the joint body and the connection nut.
  • the connection nut is screwed onto the joint body, the tube is tightened by the joint body from the inside and by a fixing ring pressed by the connection nut from the outside.
  • connection nut when the connection nut is screwed onto the joint body, the connection nut rotates relative to the tube, but the fixing ring rotates relative to the tube. Because there is nothing, it is said that the outer surface of the tube could be prevented from having an annular scratch or being cut.
  • the fixing ring harder than the tube, the connection is strengthened so that the tube does not come out of the tube joint, and the connection nut is deformed when the connection nut is fixed to the joint body. It can be prevented from occurring (see paragraph number 0021 of Cited Document 1).
  • the maximum outer diameter size of the tube is 1 inch.
  • the inventors have attempted to develop a large-sized tube that can secure a large flow rate of fluid flowing through the tube and a tube joint connected to the tube. And it became clear that in a tube joint used for a large-sized tube, the tube is easy to come out and fluid leaks more easily than a small-sized tube joint. On the other hand, it is possible to make it difficult to remove the tube from the tube joint by making the fixing ring harder than the tube.
  • the elastic modulus of the fixing ring is too high, the bending of the fixing ring when the connecting nut is screwed onto the joint body is very small, and the tube is tightened excessively from the outside in the radial direction to the inside.
  • the tube may be cut.
  • the elastic modulus of the fixing ring has a desirable range in which it is difficult to damage the outer surface of the tube while preventing the tube from coming off.
  • the fixing ring so as to have an elastic modulus in the desired range, in a state where the tube is firmly connected to the tube joint, from the radially outer side of the tube to the radially inner side with respect to the outer surface of the tube.
  • the elastic force of the fixing ring can be applied to the tube, the tube can be clamped with an appropriate force by the fixing ring and the joint body, and the connection can be strengthened while preventing the tube from being cut. Become.
  • the tube is pulled or bent in a state in which the tube is connected to the tube joint so that the tube can be firmly connected while cutting the tube is suppressed.
  • Some external force may act on the.
  • the fixing ring may extend radially outward beyond its own elastic region. In this way, when an external force acts on the tube and the fixing ring is in a state beyond its own elastic region, the force from the radially outer side of the fixing ring toward the radially inner side is less likely to act on the tube, It may become easy to come off from the tube joint.
  • the present invention has been made in view of the above-described points, and an object of the present invention is to provide a joint and a joint assembly that can suppress tube disconnection and fluid leakage even when the size is large. It is to provide.
  • the joint according to the first aspect is a joint connected to a tube having at least an inner surface made of resin, and includes a main body, a nut, and at least one ring.
  • the main body includes a tube connecting portion provided at one end, and a main body thread portion provided so that an outer diameter of the outer peripheral surface is larger than that of the tube connecting portion.
  • a through hole extending in the axial direction is formed in the main body.
  • the nut has a nut thread portion, a reduced diameter portion, and a contacted portion. The nut thread portion can be screwed into the main body thread portion of the main body in a state where the tube connecting portion of the main body is inserted from one end side in the axial direction toward the other end side in the axial direction with respect to the nut.
  • the reduced diameter portion is provided on the other end side in the axial direction of the nut and has an inner diameter smaller than that of the nut screw thread portion.
  • the contacted portion is formed so as to face one end side in the axial direction with respect to the reduced diameter portion.
  • the at least one ring is disposed in a space radially inward of the nut thread portion of the nut, has a higher elastic modulus than the tube, and contacts the contacted portion of the nut.
  • the ring has an elastic modulus that satisfies the following conditions. That is, when the main body, nut, and ring are connected to the tube, when the ring is in the elastic region, the ring is directed from the radially outer side to the radially inner side by its own stress. It is possible to push.
  • the tube when the main body, nut and ring are connected to the tube, when the ring exceeds the elastic region, the expanded ring is pushed radially inward by the radially inner surface of the nut.
  • the tube can be pushed from the radially outer side toward the radially inner side.
  • the nut threaded portion of the nut is screwed into the main body threaded portion of the main body and screwed in.
  • the ring located outside the tube comes into contact with the contacted portion of the nut and approaches the end of the tube connecting portion of the main body. Then, in a state where a part of the tube is sandwiched between the ring and the end of the tube connecting portion of the main body, the ring is elastically deformed so as to spread outward in the radial direction.
  • the elastic force can be applied to the tube so as to press the tube from the radially outer side to the radially inner side.
  • this joint uses a ring whose elastic modulus is higher than the elastic modulus of the tube.
  • the tube can be firmly fixed to make it difficult to pull out the tube, and the leakage of fluid passing through the inside of the tube can be suppressed.
  • the ring can be deformed so as to further expand and exceed the elastic region. Thereby, it can prevent that a tube is tightened too much and it can control that a tube will be cut. Even when the ring expands and deforms beyond the elastic region in this way, the expanded ring has a radially outer portion in contact with the radially inner surface of the nut, It is pushed radially inward by the inner peripheral part.
  • the elastic modulus of the ring is higher than the elastic modulus of the nut.
  • the elastic modulus of the ring is not only higher than that of the tube but also higher than that of the nut. For this reason, even if the ring is deformed so that it exceeds the elastic region and the outer peripheral part of the ring comes into contact with the inner peripheral part of the nut and is pushed radially inward, the elasticity of the nut Since the rate is not as high as the elastic modulus of the ring, it is possible to prevent the tube from being tightened excessively and to prevent the tube from being cut.
  • the shape of the cross section in which the circumferential direction of the ring is a normal direction is at least radially inside of the rectangular shape.
  • the main body side in the axial direction is chamfered or rounded.
  • the chamfered or rounded portion of the ring-side portion on the radially inner side of the ring is a portion of 0.3% to 40% of the radial width of the ring, It is a portion of 1% to 40% of the axial width of the ring.
  • the tube is sandwiched between the end of the tube connecting portion of the main body and the ring.
  • the ring is located on the inner side in the radial direction of the ring. It is in contact with the tube at the part on the main body side in the direction. And in this joint, it is a portion on the inner side in the radial direction of the ring and on the main body side in the axial direction (a portion not less than 0.3% and not more than 40% of the radial width of the ring). The portion between 1% and 40%) is chamfered or rounded.
  • the portion on the radially inner side of the ring and on the main body side in the axial direction (a portion of 0.3% to 40% of the radial width of the ring and 1% to 40% of the axial width of the ring) %),
  • the contact area with the outer surface of the tube can be made not too wide, so that the force with which the tube is pressed by the ring is dispersed and the tube is easily pulled out. It can be suppressed.
  • the joint according to the fifth aspect is the joint according to the fourth aspect, wherein the chamfered or rounded portion of the axially main body side portion is the radial direction of the ring. 3% to 29% of the width of the ring, and 2% to 25% of the axial width of the ring.
  • this joint it is possible to secure the tensile strength by biting the ring into the tube while further reducing the possibility of the tube being cut.
  • the joint according to the sixth aspect is the joint according to any one of the first aspect to the fifth aspect, when the ring is in a state in the elastic region in a state where the main body, the nut and the ring are connected to the tube.
  • the inner diameter of the portion located radially outside the portion with the largest outer diameter of the ring is X
  • the outer diameter of the portion with the largest outer diameter of the ring is Y
  • the length of the portion corresponding to X and Y is such that the value of (XY) / Y is 0.003 or more and 0.020 It is as follows.
  • the ring when the ring is connected to the tube and the ring is expanded, the ring can be surely brought out of the elastic state before the contact with the inner peripheral portion of the nut. Thereby, it can suppress more reliably that a tube will be pressed too much and will be cut
  • the joint according to the seventh aspect is the joint according to any one of the first aspect to the sixth aspect, when the ring is in the elastic region in a state where the main body, the nut and the ring are connected to the tube.
  • the inner diameter of the portion located radially outward with respect to the portion where the outer diameter of the ring is maximum is X
  • the outer diameter of the portion where the outer diameter of the ring is maximum is Y
  • the tube The length of the portion corresponding to X, Y, and Z in a state where the nut, ring, and tube are not connected to each other and no force is applied is (XY) ) / Z is 0.04 or more and 0.30 or less.
  • the joint according to the eighth aspect is the joint according to any one of the first to seventh aspects, wherein the tube is made of a resin composition containing at least one selected from the group consisting of PFA, FEP, and PTFE. Yes.
  • the nut is made of a resin composition containing at least one selected from the group consisting of PFA, PCTFE, PVDF, ETFE, and PPS.
  • the ring is composed of a resin composition containing at least one selected from the group consisting of PCTFE, PVDF, ETFE, and PPS.
  • the ring is opaque.
  • the nut is transparent or translucent.
  • the presence of the ring can be visually recognized from the outside of the nut in a state where the ring and the nut are connected to the tube. Thereby, it is possible to make it difficult to forget to attach the ring.
  • a joint assembly according to a tenth aspect includes a tube and a joint according to any one of the first to ninth aspects.
  • the tube includes a resin having chemical resistance.
  • the bending radius of the tube is 0.3 m or more and 3.0 m or less.
  • the tube is easy to bend, so even if it is necessary to transport a long tube to the site in order to connect a long distance, it is wrapped around It can be made compact.
  • the joint according to the first aspect even when the tube size is large, it is possible to suppress disconnection of the tube and fluid leakage while suppressing the tube from being cut.
  • the nut in a state where the ring is elastically deformed, when the tube is fixed by the elastic force of the ring, the nut is deformed so as to be expanded radially outward. It can be suppressed.
  • the ring in the joint according to the third aspect, the ring is deformed so as to exceed the elastic region, and the outer peripheral portion of the ring comes into contact with the inner peripheral portion of the nut and is pushed radially inward. Also, it is possible to suppress the tube from being cut.
  • the joint according to the fourth aspect it is possible to make the tube difficult to cut and to prevent the tube from coming off.
  • the joint according to the fifth aspect it is possible to secure the tensile strength by biting the ring into the tube while further reducing the possibility of the tube being cut.
  • it can suppress more reliably that a ring will contact the inner peripheral part of a nut and a tube will be cut
  • the tube can be more reliably suppressed from being cut.
  • it is possible to more reliably suppress the disconnection of the tube and the leakage of the fluid while more reliably suppressing the tube from being cut.
  • forgetting to attach the ring can be suppressed.
  • the joint assembly according to the tenth aspect the joint assembly can be made compact.
  • FIG. 4 is a partially enlarged schematic cross-sectional view in a side view in a state where a joint is connected and fixed to a tube. It is a side view partial expansion schematic sectional drawing which shows the other example regarding the state by which the coupling was connected and fixed to the tube.
  • FIG. 4 is a partially enlarged schematic cross-sectional view in a side view in a state where a joint is connected and fixed to a tube.
  • FIG. 10 is a side cross-sectional view showing a coupling fixed state of a joint according to another embodiment (7-1).
  • FIG. 10 is a side cross-sectional view showing a coupling and fixing state of a joint according to another embodiment (7-2).
  • joints and joint assemblies according to an embodiment will be described.
  • the joints and joint assemblies described below are for illustrative purposes and are not limiting.
  • the joint of the present embodiment is a joint connected to a tube, and includes a main body, a nut, and a ring.
  • the joint assembly is configured by coupling and fixing a joint to a tube.
  • the tube is a tubular member having at least an inner surface made of resin.
  • the tube only needs to have at least a radially inner surface made of a resin, and may include, for example, a metal layer in part.
  • the surface inside radial direction and the surface outside radial direction may be comprised with resin, and the intermediate
  • the tube is composed of one type of resin composition.
  • the fluid that passes through the inside of the tube is not particularly limited, and examples thereof include high-temperature water such as acid, alkali, solvent, and hot spring water, marine water, and industrial waste liquids.
  • the acid include hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid, and phosphoric acid.
  • the alkali include aqueous ammonia, organic amines such as ethanolamine, sodium hydroxide, potassium hydroxide and the like.
  • the solvent include alcohols such as methanol and propanol, and organic solvents such as toluene.
  • the state of the fluid passing through the inside of the tube may be a pressurized state. In such a state where the fluid is pressurized, leakage from the joint portion tends to be a problem, but in the joint of this embodiment, even when such pressurized fluid flows inside, The leakage can be suppressed.
  • the tube has an inner diameter of 28.0 mm or more in a state where it is not connected and fixed and no force is applied, in order to improve the workability while ensuring a larger flow rate of the fluid passing through the inside. It is preferably 0.0 mm or less, and more preferably 45.0 mm or more and 55.0 mm or less.
  • the outer diameter of the tube is preferably greater than 38.1 mm (1.5 inches) and more preferably greater than 50.8 mm (2.0 inches). Moreover, it is preferable that the outer diameter of a tube is 70.0 mm or less. Furthermore, the outer diameter of the tube is more preferably 52.0 mm or more and 62.0 mm or less.
  • the thickness of the tube is preferably 2.5 mm or greater and 4.0 mm or less, and more preferably 3.0 mm or greater and 3.5 mm or less.
  • the bending radius of the tube is preferably from 0.3 m to 3.0 m, and more preferably from 0.5 m to 1.5 m.
  • the bending radius of the tube refers to a radius immediately before the tube is bent (not broken) when the tube is bent in an arc shape.
  • the tube thickness is 1.0 mm or more and 10.0 mm or less, and the bending radius of the tube Is preferably 0.3 m or more and 1.5 m or less.
  • the tube is preferably heated and expanded at the end of the connection destination.
  • the resin constituting the tube is preferably a resin having chemical resistance.
  • the resin having chemical resistance include PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), FEP (tetrafluoroethylene / hexafluoropropylene copolymer), PTFE (polytetrafluoroethylene), and these. Of the mixture.
  • the resin constituting the tube is preferably PFA from the viewpoint of chemical resistance, cracking resistance, heat resistance, and mechanical properties that are difficult to break even when bent.
  • the melting point determined by DSC (differential scanning calorimetry) of the resin and determined by the peak top is preferably 260 ° C. or higher and 310 ° C.
  • the elastic modulus of the resin measured according to ASTM D638 is preferably 300 MPa or more and 800 MPa or less, and more preferably 400 MPa or more and 800 MPa or less.
  • the surface roughness of the tube is preferably 0.001 or more and 2.0 or less.
  • the surface roughness here was measured as the arithmetic average roughness Ra ( ⁇ m) on the outer surface of the tube in accordance with JIS B0601-1994 using SURFTEST ⁇ SV-600 manufactured by Mitutoyo.
  • Main body has a tube connecting portion and a main body thread portion, and a through hole extending in the axial direction is formed.
  • the main body thread portion is provided on the inner side in the axial direction with respect to the tube connecting portion, and has an outer diameter larger than the outer diameter of the tube connecting portion, and is configured to be screwed with the nut thread portion of the nut.
  • the main body may further include an attachment-side screw thread portion and a main body operation portion.
  • the mounting-side thread portion is provided on the outer peripheral surface near the end opposite to the side where the tube connecting portion is provided in the axial direction, and is screwed with the thread of the mating member to which the joint is connected. Is configured to do.
  • the main body operation portion is a portion that is clamped by a wrench or a human finger when the nut is screwed into the main body, and is provided between the main body screw thread portion and the mounting screw thread portion in the axial direction.
  • the main body operation unit has a polygonal shape or a deformed shape when viewed in the axial direction.
  • the tube connecting portion is formed in a cylindrical shape on one end side of the main body.
  • the tube connecting portion is covered from the radially outer side by the inner surface of the tube by attaching the tube.
  • the main body thread portion is provided on the outer peripheral surface so as to have an outer diameter larger than that of the tube connecting portion.
  • the tube connection part of the main body is provided with a tube insertion end at the axially outer end.
  • the tube insertion end has a radially outer insertion portion configured such that a radially outer portion is positioned radially inward as it goes outward in the axial direction, and a radially inner portion is radially outward as it goes outward in the axial direction.
  • the radially outer insertion portion may be configured by an outer inclined surface, or may be configured by an outer R portion that is outward in the axial direction and bulges toward the radially outer side and is gently curved.
  • the radially outer insertion portion is constituted by the outer inclined surface, the smaller one of the angles formed by the outer inclined surface and the axial direction is not connected and fixed in the axial sectional shape. In a state where no force is applied, it is preferably 30 degrees or more and 60 degrees or less.
  • the radially inner insertion portion is preferably not constituted by an R portion which is axially outer and bulges radially inward and is gently curved, and more preferably constituted by an inner inclined surface.
  • the radially inner insertion portion is constituted by the R portion
  • the radially inner insertion portion is constituted by the inner inclined surface
  • the smaller one of the angles formed by the inner inclined surface and the axial direction is not connected and fixed in the axial sectional shape. In a state where no force is applied, it is preferably 30 degrees or more and 70 degrees or less. By setting the angle to 30 degrees or more, it is possible to avoid a decrease in strength due to a decrease in the radial thickness at the distal end of the tube connecting portion.
  • the position of the boundary portion in the radial direction between the radially outer insertion portion and the radially inner insertion portion in the tube coupling portion of the main body is within the range of the thickness width of the tube coupling portion and closer to the radially inner side of the tube coupling portion. Preferably it is located.
  • the diameter of the circle formed by the boundary portion is preferably smaller than the inner diameter of the ring. This prevents the tip of the boundary portion of the tube connecting portion from piercing the tube in the thickness direction of the tube in a state where the tube is connected and fixed to the joint, and makes the tube difficult to cut. Because.
  • the inclination of the inclined surface of the ring in the axial sectional shape is preferably less than 10 degrees, and more preferably matches.
  • the diameter of the circle formed by the boundary portion of the tube connecting portion is smaller than the outer diameter of the tube and larger than the inner diameter of the tube.
  • the outer diameter of the tube connecting portion of the main body is preferably 1.05 times or more and 1.10 times or less the outer diameter of the tube in a state where the tube is not connected and fixed and no force is applied.
  • the thickness in the radial direction of the tube connecting portion of the main body is preferably 1.5 times or more and 1.8 times or less the thickness of the tube in a state where the tube is not connected and fixed and no force is applied.
  • the main body may be composed of a plurality of parts, but is preferably composed of one kind of resin composition.
  • the resin constituting the main body is also preferably a resin having chemical resistance like the tube. Examples of such a resin include PTFE (polytetrafluoroethylene) or PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer).
  • the melting point determined by determining the peak top by DSC (differential scanning calorimetry) of this resin is preferably 320 ° C. or higher and 330 ° C. or lower, and more preferably 327 ° C.
  • the raw material of the PTFE molded product is compressed and solidified in a mold after powdery PTFE raw material powder is fired in a hot air environment furnace of 360 ° C. or higher and 380 ° C. or lower.
  • the melting point is higher than 327 ° C. and the mechanical properties are inferior.
  • the elasticity modulus measured based on ASTMD638 of this resin is 400 MPa or more and 800 MPa or less.
  • the surface roughness of the main body is preferably 0.001 or more and 2.0 or less.
  • the measurement of the surface roughness here measured the surface of the radial direction outer side insertion part located in the front-end
  • the surface roughness here is measured using the SURFTEST SV-600 manufactured by Mitutoyo as the arithmetic average roughness Ra ( ⁇ m) on the surface of the radially outer insertion portion in accordance with JIS B0601-1994. did.
  • the nut has a nut thread portion, a reduced diameter portion, and a contacted portion.
  • the nut thread portion is configured to be able to be screwed with the main body thread portion in a state where the tube connecting portion of the main body is inserted from one axial end side (opening opening side) to the other axial end side. Has been.
  • the reduced diameter portion is provided on the other end side in the axial direction (the side opposite to the insertion opening side), and is configured such that the inner diameter is smaller than the nut thread portion.
  • the contacted portion is formed so as to face one end side (opening opening side) in the axial direction with respect to the reduced diameter portion.
  • the abutted portion is a portion of the entire nut that abuts a part of the ring in a state where the tube is connected and fixed to the joint.
  • the nut is preferably configured so that the radial thickness at the end on the insertion opening side in the axial direction is thicker than the portion in the vicinity thereof.
  • the nut is preferably provided with a nut cylindrical portion that is not provided with a screw thread and extends in the axial direction between the nut screw thread portion and the reduced diameter portion.
  • the radial thickness of the nut cylindrical part of the nut is such that the ring itself is deformed so that the tube will not come out even when the ring, which will be described later, is expanded beyond the elastic state and the outer diameter part of the ring is in contact with the nut. Is preferably 1.5 times to 4.0 times the thickness of the tube, and more preferably 2.5 times to 3.5 times.
  • the nut may have a nut operation portion whose outer peripheral shape is a polygonal shape or a deformed shape when viewed in the axial direction.
  • a nut operation part is a part pinched
  • the shape of the abutted portion is not particularly limited, but it is preferably a shape corresponding to a part of the abutting ring in a state where the tube is connected and fixed to the joint. For example, if the shape of a part of the ring that abuts in a state where the tube is connected and fixed to the joint is a surface shape, and the normal direction of the surface is the axial direction, the abutted portion is also a surface shape.
  • the normal direction of the surface is preferably the axial direction. It is preferable that the nut is comprised with one type of resin composition.
  • the resin constituting the nut is also preferably a resin having chemical resistance like the tube and the main body.
  • examples of such resins include PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), PCTFE (polychlorotrifluoroethylene), PVDF (polyvinylidene fluoride), ETFE (tetrafluoroethylene / ethylene copolymer). Coalesced), PPS (polyphenylene sulfide), and mixtures thereof. Especially, it is preferable that it is comprised by PFA.
  • the melting point determined by determining the peak top by DSC (differential scanning calorimetry) of this resin is preferably 295 ° C. or higher and 310 ° C. or lower. Since PFA having a melting point of 295 ° C. or higher is not too soft, deformation can be suppressed and the tube can be prevented from coming off. Further, PFA having a melting point of 310 ° C. or lower is excellent in cracking resistance and is not easily cracked.
  • the elastic modulus of the resin measured according to ASTM D638 is preferably 400 MPa or more and 800 MPa or less.
  • the nut is preferably transparent or translucent from the viewpoint that it can be visually confirmed whether or not the ring is located inside (the ring is not forgotten to be attached) in a state where the tube is connected and fixed to the joint. .
  • Ring The ring is an annular member that is disposed in a space radially inward of the nut thread portion of the nut, has a higher elastic modulus than the tube, and is used so as to contact the contacted portion of the nut. As long as at least one ring is used in the joint, a plurality of rings may be used. When a plurality of rings are used, the ring that comes into contact with the contacted portion of the nut may be different from the ring that comes into contact with the outer surface of the tube. In a state where the main body, the nut and the ring are connected to the tube, the ring has an elastic modulus capable of realizing the following properties.
  • the tube when the ring is in the elastic region, the tube can push the tube from the radially outer side to the radially inner side by its own stress. Moreover, when the ring is beyond the elastic region, the expanded ring is pushed radially inward by the radially inner surface of the nut, thereby pushing the tube from the radially outer side to the radially inner side. Can do.
  • the elastic modulus of the ring By adjusting the elastic modulus of the ring so that it is higher than the elastic modulus of the tube, the ring can be moved radially outward while a part of the tube is sandwiched between the ring and the end of the tube connecting part of the body.
  • the expanded ring has a radially outer portion in contact with the radially inner surface of the nut, It is pushed radially inward by the inner peripheral part.
  • the ring pressed radially inward by the nut can be fastened and fixed by pressing the tube from the radially outer side toward the radially inner side, making it difficult to pull out the tube and passing through the inside of the tube The leakage of fluid can be suppressed.
  • the ring since the ring is used as a member different from the nut, the nut rotates around the tube at the stage of screwing the nut onto the main body, but the rotation of the ring is suppressed. Thereby, it is possible to suppress the outer periphery of the tube from being damaged by the rotation of the ring and to protect the tube from cutting.
  • the shape of the cut surface with the circumferential direction as the normal direction is a rectangular shape, or a shape that is at least radially inward and has a chamfered or rounded portion on the main body side in the axial direction
  • the chamfered or rounded portion of the ring on the radially inner side of the ring is a portion that is 0.3% or more and 40% or less of the radial width of the ring. It is preferably a portion that is 1% or more and 40% or less of the axial width of the ring, is a portion that is 3% or more and 29% or less of the radial width of the ring, and is 2% or more of the axial width of the ring.
  • the ring comes into contact with the tube at a portion on the radially inner side of the ring and on the main body side in the axial direction.
  • a chamfered shape or a rounded shape is adopted in the portion on the radially inner side of the ring and on the main body side in the axial direction (the width of the ring in the radial direction).
  • a portion where the chamfered or rounded shape of the ring is adopted is a portion which is 40% or less of the radial width of the ring and 40% or less of the axial width of the ring. Therefore, since the contact area with the outer surface of the tube can be prevented from being too wide, it is possible to suppress the force that the tube is pressed by the ring from being dispersed and the tube from being easily pulled out. .
  • the chamfered or rounded portion at the radially inner side of the ring and the portion on the main body side in the axial direction is a portion of 3% to 29% of the radial width of the ring, If it is a portion of 2% or more and 25% or less of the axial width of the ring, the tensile strength can be secured by biting the ring into the tube while further reducing the possibility of the tube being cut. It becomes possible.
  • the tube is attached in a state inclined with respect to the axial direction so as to be along the outer surface of the radially outer insertion portion of the main body, among the portions on the main body side in the axial direction on the radial inner side of the ring, Portions other than the chamfered or rounded portion are pressed against the tube toward the direction of decreasing the tube thickness against the portion of the outer surface of the tube inclined with respect to the axial direction.
  • the radially outer insertion portion of the main body is pressed against the tube toward the direction of reducing the thickness of the tube against the portion of the inner surface of the tube that is inclined with respect to the axial direction.
  • the tube is clamped by the portion on the radially inner side of the ring in the axial direction on the main body side and the radially outer side insertion portion of the main body.
  • the portion where the tube is sandwiched is thinner than the other portion of the tube.
  • the portion deeper than the portion where the tube is held is thicker than the portion where the tube is held.
  • the smaller one of the angles formed by the normal of the chamfered surface and the radial direction of the ring is 20 degrees or more and 70 degrees or less. It is preferable that it is 30 degrees or more and 60 degrees or less, and it is especially preferable that it is 45 degrees.
  • the outer diameter of the ring should be such that when the ring is expanded by being pushed outward in the radial direction, the inner diameter of the ring is in contact with the inner side of the nut without exceeding the elastic region. Specifically, it is preferably 85.0% or more and 99.9% or less, and more preferably 98.0% or more and 99.9% or less, of the inner diameter of the nut cylindrical portion of the nut.
  • the gap formed between the portion where the outer diameter of the ring is the longest and the inner diameter of the nut cylindrical portion of the nut is 0.1 mm or more in a state where no force is applied without being connected and fixed. It is preferably 0 mm or less, and more preferably 0.2 mm or more and 1.0 mm or less.
  • the inner diameter of the ring is preferably 1.001 times or more and 1.04 times or less of the outer diameter of the tube, and more preferably 1.001 times or more and 1.01 times or less of the outer diameter of the tube.
  • the radial thickness of the ring is preferably thicker than the tube. Specifically, the radial thickness of the ring is preferably 1.2 times or more and 2.5 times or less of the tube thickness, and 1.2 times or more and 2.0 times or less of the tube thickness. Is more preferably 1.4 times or more and 1.8 times or less.
  • the axial width of the ring is not particularly limited, but for example, it is preferably 0.5 to 4 times the thickness in the radial direction of the ring, and preferably 1.0 to 2.0 times. More preferred.
  • the ring is preferably composed of a single resin composition.
  • the resin constituting the ring is also preferably a resin having chemical resistance like the tube, the main body, and the nut.
  • examples of such resins include PVDF (polyvinylidene fluoride), PCTFE (polychlorotrifluoroethylene), ETFE (tetrafluoroethylene / ethylene copolymer), PPS (polyphenylene sulfide), and mixtures thereof. It is done.
  • These resin compositions may contain fillers, but preferably do not contain glass fibers.
  • PVDF or PCTFE is preferable.
  • the melting point determined by determining the peak top by DSC (differential scanning calorimetry) of this resin is preferably 130 ° C.
  • the elastic modulus of the resin measured according to ASTM D638 is preferably 500 MPa to 4000 MPa, more preferably higher than the elastic modulus of the nut, more preferably higher than the elastic modulus of the tube, 1000 MPa More preferably, it is 2500 MPa or less.
  • the elastic modulus of the nut When the elastic modulus of the nut is lower than the elastic modulus of the ring, the outer periphery of the ring is deformed so that it exceeds the elastic region in a state where the joint is connected and fixed to the tube, and the outer peripheral portion of the ring becomes the inner peripheral portion of the nut. Even if it is in a state where it is pressed against the inner side in the radial direction, the height of the elastic modulus of the nut is not as high as the elastic modulus of the ring, so that the tube is overtightened This can prevent the tube from being cut.
  • the ring When the nut is transparent or translucent, the ring is preferably opaque or colored from the viewpoint of preventing forgetting to attach the ring.
  • the surface roughness of the ring is preferably 0.001 or more and 8.0 or less.
  • the surface roughness is measured so that the surface of the portion of the ring that is located closest to the radially outer insertion portion of the main body in the connected and fixed state is not in the circumferential direction but in the substantially axial direction. Measured.
  • the surface roughness here was measured as the arithmetic average roughness Ra ( ⁇ m) on the surface of the above part of the ring using Mitutoyo SURFTEST SV-600 and conforming to JIS B0601-1994. .
  • each member that is, when the ring is in the elastic region with the main body, nut and ring connected to the tube, the ring of the inner peripheral portion of the nut
  • the inner diameter of the portion located radially outward with respect to the portion having the largest outer diameter is X
  • the outer diameter of the portion having the largest outer diameter is Y
  • the nut and the ring are connected.
  • the value of the formula (XY) / Y represented by the length of the portion corresponding to X and Y in a state where no force is applied is preferably 0.003 or more and 0.020 or less, It is more preferably 0.0055 or more and 0.0121 or less, and further preferably 0.0055 or more and 0.0090 or less.
  • each member that is, when the ring is in the elastic region with the main body, the nut and the ring connected to the tube, of the inner peripheral portion of the nut, the ring
  • the inner diameter of the portion located radially outside the portion having the largest outer diameter is X
  • the outer diameter of the portion having the largest outer diameter of the ring is Y
  • the thickness of the tube is Z
  • the value of the formula (XY) / Z expressed by the length of the portion corresponding to X, Y and Z in a state where the nut, ring, and tube are not connected to each other and no force is applied It is preferably 0.04 or more and 0.30 or less, and more preferably 0.05 or more and 0.25 or less.
  • FIG. 1 is an exploded perspective view showing an outline of the appearance of the joint and the joint assembly according to the first embodiment.
  • the joint assembly 150 is configured by coupling and fixing the joint 100 to the tube 90.
  • the joint 100 includes the main body 20, a ring 70, and a nut 30.
  • the tube 90 is radially inward of the nut 30 by screwing the nut 30 into the main body 20 in a state where one end of the tube 90 is connected to a tube connecting portion 22 (described later) of the main body 20. They are connected and fixed by being sandwiched between a ring 70 located on the radially outer side of the tube 90 and a tube insertion end 21 (described later) of the main body 20.
  • each member will be described in detail.
  • the tube 90 was made of PFA resin, and had an outer diameter of 57.4 mm, an inner diameter of 50.8 mm, and a radial thickness of 3.3 mm.
  • the bending radius of the tube 90 was 0.91 m, and the elastic modulus of the tube 90 was 450 MPa.
  • the main body 20 includes a tube insertion end 21, a tube connecting portion 22, a main body screw thread portion 23, a main body operation portion 24, an attachment-side screw thread portion 25, and a through hole 26.
  • the tube insertion end 21 constitutes the distal end on the side where the tube 90 is inserted.
  • the tube insertion end 21 includes an outer inclined surface 21a configured so that a radially outer portion is positioned radially inward as it extends outward in the axial direction, and an axially outer side.
  • the inner inclined surface 21b is configured such that the radially inner portion is positioned radially outward as it goes.
  • the tube connecting portion 22 is a portion where the inner surface of the tube 90 is in contact with the outer surface in a state where the tube 90 is inserted, and is configured to extend from the tube insertion end 21 in a cylindrical shape.
  • the main body thread portion 23 is provided on the side opposite to the tube insertion end 21 side with respect to the tube connecting portion 22, and has an outer diameter larger than the outer diameter of the tube connecting portion 22. It is configured to be screwed with the mountain portion 34.
  • the main body operation unit 24 is a portion that is clamped by a wrench or a human finger when the nut 30 is screwed into the main body 20, and is provided on the side opposite to the tube coupling unit 22 side with respect to the main body screw thread portion 23. .
  • the main body operation unit 24 has a shape in which each side of the rectangle is gently connected when viewed in the axial direction.
  • the attachment-side screw thread portion 25 has a screw thread for being screwed to an attachment object (not shown).
  • the through hole 26 is a hole that penetrates the main body 20 in the axial direction.
  • the total length a1 of the tube insertion end 21 and the tube connecting portion 22 is 28.0 mm
  • the length a2 of the main body thread portion 23 is 40.0 mm
  • the length a3 of the main body operation unit 24 was 20.0 mm
  • the length a4 of the attachment-side screw thread portion 25 was 30.0 mm.
  • the inner diameter a5 of the through hole is 20.8 mm
  • the diameter a6 of the circle formed by the boundary between the outer inclined surface 21a and the inner inclined surface 21b is 54.8 mm
  • the tube connection The outer diameter a7 of the part 22 was 61.8 mm, and all were located on the concentric circle.
  • the inclination angle ⁇ 1 of the outer inclined surface 21a with respect to the axial direction was 45 degrees
  • the inclination angle ⁇ 2 of the inner inclined surface 21b with respect to the axial direction was 45 degrees
  • the angle formed by the inclined surface of the outer inclined surface 21a and the inclined surface of the inner inclined surface 21b was 90 degrees.
  • interval a8 of the opposing surfaces of the main body operation part 24 was 80.0 mm.
  • the main body 20 was made of PTFE.
  • the elastic modulus of the main body 20 was 460 MPa.
  • the ring 70 includes an inner surface 71, an outer surface 72, a first side surface 73, a second side surface 74, an inner first inclined surface 75, an outer first inclined surface 76, an outer second inclined surface 77, and This is an annular member having an inner second inclined surface 78.
  • the inner surface 71 constitutes the innermost surface in the radial direction of the ring 70 by a surface extending in a cylindrical shape parallel to the axial direction.
  • the outer surface 72 forms a radially outermost surface of the ring 70 by a surface extending in a cylindrical shape in parallel with the axial direction.
  • the first side surface 73 is a circumferential surface whose normal direction is the axial direction, and constitutes one end side of the ring 70 in the axial direction.
  • the second side surface 74 is a circumferential surface whose normal direction is the axial direction, and constitutes the other end side of the ring 70 in the axial direction.
  • the inner first inclined surface 75 is an inclined surface that connects the inner surface 71 and the first side surface 73, and the inclined surface is formed so as to be positioned radially outward as it approaches the first side surface 73 side in the axial direction. .
  • the outer first inclined surface 76 is an inclined surface connecting the outer surface 72 and the first side surface 73, and the inclined surface is formed so as to be positioned radially inward as it approaches the first side surface 73 side in the axial direction.
  • the outer second inclined surface 77 is an inclined surface that connects the outer surface 72 and the second side surface 74, and the inclined surface is formed so as to be positioned radially inward as it approaches the second side surface 74 side in the axial direction.
  • the inner second inclined surface 78 is an inclined surface that connects the inner surface 71 and the second side surface 74, and the inclined surface is formed so as to be positioned radially outward as it approaches the second side surface 74 side in the axial direction. .
  • the ring 70 had an inner diameter b1 of 57.7 mm, an outer diameter b2 of 68.5 mm, and an axial thickness b3 of 8.0 mm.
  • the inner first inclined surface 75, the outer first inclined surface 76, the outer second inclined surface 77, and the inner second inclined surface 78 are all smaller angles of the inclined angles of the inclined surface with respect to the axial direction. Was 45 degrees.
  • the inner first inclined surface 75 and the inner second inclined surface 78 are both shaped and large so as to be generated by obliquely scraping a width of 0.3 mm in the axial direction and a width of 0.3 mm in the radial direction. (See b4 and b7 in FIG. 5).
  • Each of the outer first inclined surface 76 and the outer second inclined surface 77 has a shape and a size that are generated by obliquely scraping off a width of 0.5 mm in the axial direction and a width of 0.5 mm in the radial direction. (See b5 and b6 in FIG. 5).
  • the ring 70 has a symmetrical shape, and the same result can be obtained regardless of which axial direction is directed to the main body 20 side. Therefore, in the present embodiment, the first side surface 73 is set to the main body 20 side.
  • the portion that mainly contributes to the clamping of the tube 90 with the main body 20 is the inner first inclined surface 75.
  • the inclination angle of the inner first inclined surface 75 with respect to the axial direction is 45 degrees in common with the inclination angle of the outer inclined surface 21a of the main body 20 with respect to the axial direction.
  • the ring 70 was made of PVDF.
  • the elastic modulus of the ring 70 was 2200 MPa.
  • the nut operating portion 33 is a portion that is clamped by a wrench or a human finger when the nut 30 is screwed into the main body 20, and is formed on the side opposite to the insertion end portion 31 side in the axial direction with respect to the outer cylindrical portion 32.
  • the nut operation unit 33 is configured such that each corner of the hexagon is rounded when viewed in the axial direction.
  • the nut thread portion 34 is formed inside the nut 30 so that the nut thread portion 34 can be screwed into the main body thread portion 23 from the radially outer side when the nut 30 is inserted into the main body 20 and screwed. This constitutes the insertion end 31 side.
  • the reduced diameter portion 36 extends from the end opposite to the insertion end portion 31 side toward the insertion end portion 31 side, and forms a cylindrical portion inside the nut 30.
  • the nut cylindrical portion 35 constitutes a cylindrical portion inside the nut 30 so as to connect the nut thread portion 34 and the reduced diameter portion 36 in the axial direction, and the diameter of the reduced diameter portion 36 in the radial direction. This is the outer side in the direction and the inner side in the radial direction of the nut thread 34.
  • the abutted portion 37 is configured so that the end portion on the insertion end portion 31 side of the reduced diameter portion 36 and the end portion on the opposite side of the insertion end portion 31 side of the nut cylindrical portion 35 spread in the radial direction. It is comprised by the connected surface (facing the insertion end part 31 side).
  • the curved portion 38 is an R-shaped portion provided at a portion where the end portion of the nut cylindrical portion 35 opposite to the insertion end portion 31 side and the contacted portion 37 are connected.
  • the nut 30 has an outer diameter c1 of 95.0 mm at the insertion end 31, and a length c2 obtained by connecting the rounded shapes facing each other in the nut operation portion 33 is 90 0.0 mm.
  • the length c3 of the insertion end portion 31 is 41.5 mm
  • the length c4 of the outer cylindrical portion 32 is 31.0 mm
  • the nut operation portion The length c5 of 33 was 5.0 mm.
  • the inner diameter c6 of the nut cylindrical portion 35 was 69.0 mm
  • the inner diameter c7 of the reduced diameter portion 36 was 58.0 mm.
  • FIG. 6 the length in the axial direction
  • the length c3 of the insertion end portion 31 is 41.5 mm
  • the length c4 of the outer cylindrical portion 32 is 31.0 mm
  • the nut operation portion The length c5 of 33 was 5.0 mm.
  • the inner diameter c6 of the nut cylindrical portion 35 was 69.0 mm
  • the length c8 of the nut thread portion 34 is 34.0 mm
  • the length c9 of the nut cylindrical portion 35 is 32.5 mm
  • the diameter is reduced.
  • the length c10 of the part 36 was 11.0 mm.
  • the radius of curvature of the curved portion 38 was 0.5 mm.
  • the nut 30 was made of PFA.
  • the elastic modulus of the nut 30 was 500 MPa.
  • the main body 20, the ring 70 and the nut 30 were fixed to the tube 90 and the joint 100 was connected and fixed to the tube 90 in the following procedure.
  • the distal end of the tube 90 to which the joint 100 is to be attached is inserted into the nut 30 via the reduced diameter portion 36 side, and further inserted into the ring 70, as shown in the side sectional view of FIG. It was.
  • the inner diameter of the distal end portion of the tube 90 to which the joint 100 is to be attached was heated and expanded to about the outer diameter of the tube connecting portion 22.
  • the tube connection part 22 of the main body 20 was inserted inside the front-end
  • the nut 30 was moved closer to the main body 20 in the axial direction, and moved to a portion where the main body screw thread portion 23 of the main body 20 and the nut screw thread portion 34 of the nut 30 began to be screwed together.
  • the ring 70 moved toward the main body 20 in the axial direction by the second side surface 74 of the ring 70 contacting the contacted portion 37 of the nut 30 in the axial direction.
  • the nut 30 was screwed with respect to the main body 20 so that it might be in the state shown to sectional drawing of the side view of FIG.
  • the main body 20 and the tube 90 are generally integrated and do not rotate as the nut 30 rotates.
  • the ring 70 basically follows the outer surface of the tube 90 in the axial direction. It only moves and the ring 70 does not rotate on the outer surface of the tube 90.
  • the inner first inclined surface 75 of the ring 70 comes into contact with a portion of the tube 90 located near the outer inclined surface 21a of the main body 20. . Further, as the operation of screwing the nut 30 into the main body 20 is continued, a portion of the tube 90 located in the vicinity of the outer inclined surface 21a of the main body 20 is moved by the inner first inclined surface 75 of the ring 70 in the axial direction. Push toward the main body 20 side. At this time, the ring 70 has a reaction force that is pushed back from the portion of the tube 90 that is located near the outer inclined surface 21a of the main body 20 to the side opposite to the main body 20 side in the axial direction, and a radially outer side.
  • the ring 70 is elastically deformed and is in a state in the elastic region, whereby an elastic force is applied to a portion of the tube 90 located in the vicinity of the outer inclined surface 21a of the main body 20.
  • an elastic force is applied to a portion of the tube 90 located in the vicinity of the outer inclined surface 21a of the main body 20.
  • the tightening torque when tightening the nut 30 reaches a predetermined value of 250 kgf ⁇ cm
  • the operation of screwing the nut 30 into the main body 20 is finished, and the state shown in the side sectional view of FIG.
  • the joint 100 was connected and fixed to the tube 90.
  • the reason why the tightening torque is a value of 250 kgf ⁇ cm is based on the following reason.
  • the sealing property can be improved (the fluid passing through the tube 90 does not leak) and the tensile strength can be improved (the tube 90).
  • the lower limit of the value of the tightening torque was grasped from the viewpoint that the screw cannot be removed from the joint 100).
  • the tube connecting portion 22 of the main body 20 will not fall greatly inward in the radial direction due to excessive tightening and the flow path will not be greatly narrowed. From this point of view, we grasped the upper limit of the tightening torque value.
  • An appropriate value for determining that the operation of screwing the nut 30 into the main body 20 has been completed is determined from the lower limit and upper limit ranges of the tightening torque thus obtained.
  • the end point of the screwing operation of the nut 30 into the main body 20 is a tightening distance corresponding to the above-described tightening torque value (a position where the outer surface of the nut 30 is located, a position where the outer surface of the main body 20 is located, It may be determined by predetermining the change in the distance.
  • FIG. 13 shows an enlarged schematic cross-sectional view of the main part in a state where the joint 100 is connected and fixed to the tube 90.
  • a gap in the radial direction is formed between the outer surface 72 constituting the radially outer side of the ring 70 and the inner surface of the nut cylindrical portion 35 of the nut 30 positioned on the radially outer side.
  • the radial distance B from the axial center to the inner surface of the nut cylindrical portion 35 of the nut 30 is longer than the radial distance A from the axial center to the outer surface 72 of the ring 70.
  • This gap can be confirmed as follows, for example.
  • the nut cylindrical portion 35 of the nut 30 is connected and fixed, and the nut 30 is removed from the connected and fixed state.
  • the radial distance C from the axial center to the boundary between the outer inclined surface 21 a and the inner inclined surface 21 b of the main body 20 is the radial distance from the axial center to the inner surface 71 of the ring 70.
  • the boundary portion between the outer inclined surface 21a and the inner inclined surface 21b of the main body 20 is shorter than the distance D and is within the range of the radial thickness width of the tube 90 (the portion located on the radially inner side of the ring 70). Was located at.
  • the state where the tightening torque is reached is the state of being connected and fixed.
  • the state of being connected and fixed is a different standard. You may specify. For example, as shown in FIG. 14, the axis between the position s in the axial direction of the first side surface 73 of the ring 70 and the position t in the axial direction of the boundary portion between the outer inclined surface 21 a and the inner inclined surface 21 b of the main body 20. The distance in the direction is within 30% of the thickness of the tube 90 in the radial direction (half of the difference between the outer diameter and the inner diameter when no force is applied) (minus 30% or more plus 30% or less).
  • the state of being connected may be a state of being connected and fixed.
  • FIG. 15 shows an enlarged schematic cross-sectional view of a main part when an external force is further applied to the tube 90 in a state where the joint 100 is connected and fixed to the tube 90.
  • an external force was applied by pulling the tube 90 so that the tube 90 was separated from the joint 100 in the axial direction in a connected and fixed state.
  • the tensile strength here was set to 15 MPa based on the shape, dimensions, and material of the above example.
  • the tensile speed was 200 mm / min.
  • the thickness of the tube 90 is thin at the portion sandwiched between the inner first inclined surface 75 of the ring 70 and the outer inclined surface 21a of the main body 20, and the thickness before and after the thickness is reduced. Is getting thicker.
  • the ring 70 is moved radially outward by the portion of the tube 90 where the thickness is thick. It will be expanded. In this way, the ring 70 exceeds the elastic region, and the outer surface 72 constituting the radially outer side of the ring 70 comes into contact with the inner surface of the nut cylindrical portion 35 of the nut 30.
  • the value of 15 MPa of the tensile strength as the external force described above is (i) the maximum stress due to the tube tension (value when the tube extends beyond the yield point) and (ii) the maximum stress due to the fluid pressure ( (Iii) based on the specification of the maximum working pressure of the tube 90) and (iii) the maximum stress due to tightening, and the situation where a tensile stress obtained by summing was applied.
  • the ring 70 is in a state exceeding the elastic region, and is located on the outer surface 72 constituting the radially outer side of the ring 70 and the radially outer side thereof.
  • the inner surface of the nut cylindrical portion 35 of the nut 30 is in contact.
  • the outer surface 72 which comprises the radial direction outer side of the ring 70 is colored beforehand.
  • the color of the colored paint is generated on the inner surface of the nut cylindrical portion 35 of the nut 30.
  • the acceptance criterion was that there was no leakage of N 2 gas (generation of bubbles) for 1 minute.
  • N 2 gas generation of bubbles
  • the hand pressure pump gradually increases the internal pressure to check for fitting leakage and tube 90 disconnection. It was done by checking.
  • the acceptance criterion was that no leakage occurred until the tube 90 burst.
  • the embodiment is not limited to this.
  • the ring 70 and the ring 270 are pivoted by further using a ring 270 having the same shape and size as the ring 70 of the above embodiment. You may use it side by side so that it may continue in a direction.

Abstract

La présente invention concerne un organe d'accouplement et un ensemble d'accouplement grâce auxquels il est possible d'empêcher un déplacement de tube et une fuite de liquide, même dans le cas d'une grande taille. Un anneau (70) se situe sur l'intérieur d'un écrou (30) et sur l'extérieur d'un tube (90), et présente un module d'élasticité plus élevé que celui du tube (90). L'anneau (70) présente un module d'élasticité qui répond aux conditions suivantes. Dans un état dans lequel un corps principal (20), l'écrou (30) et l'anneau (70) ont été reliés au tube (90), lorsque l'anneau (70) se trouve dans la plage élastique, il est possible de pousser le tube (90) vers le côté intérieur diamétral depuis le côté extérieur diamétral en raison de la contrainte de l'anneau (70) lui-même. De plus, dans un état dans lequel l'anneau (70) a dépassé la plage élastique, il est possible de pousser le tube (90) vers le côté intérieur diamétral depuis le côté extérieur diamétral, en raison de l'anneau (70) dilaté qui est pressé vers le côté intérieur diamétral par la surface sur le côté intérieur diamétral de l'écrou (30).
PCT/JP2013/069318 2012-07-17 2013-07-16 Organe d'accouplement et ensemble d'accouplement WO2014013994A1 (fr)

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KR1020157002380A KR101634507B1 (ko) 2012-07-17 2013-07-16 커플링 및 커플링 조립체
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JP5858195B1 (ja) * 2014-09-05 2016-02-10 ダイキン工業株式会社 継手および継手組立体
JP2017129273A (ja) * 2016-01-19 2017-07-27 ダイキン工業株式会社 樹脂配管の巻き取り構造体、巻き取り構造体の製造方法、樹脂配管の敷設方法、および、樹脂配管
US11378207B2 (en) 2019-11-22 2022-07-05 Trinity Bay Equipment Holdings, LLC Swaged pipe fitting systems and methods

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TWI534381B (zh) * 2013-04-25 2016-05-21 和正豐科技股份有限公司 防止管件與管接頭鬆脫之管接頭
CN106439288A (zh) * 2016-10-19 2017-02-22 中航飞机股份有限公司西安飞机分公司 一种组合导管

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KR20180102156A (ko) * 2016-01-19 2018-09-14 다이킨 고교 가부시키가이샤 수지 배관의 권취 구조체, 권취 구조체의 제조 방법, 수지 배관의 부설 방법, 및 수지 배관
KR102090573B1 (ko) * 2016-01-19 2020-03-18 다이킨 고교 가부시키가이샤 수지 배관의 권취 구조체, 권취 구조체의 제조 방법, 수지 배관의 부설 방법, 및 수지 배관
US11378207B2 (en) 2019-11-22 2022-07-05 Trinity Bay Equipment Holdings, LLC Swaged pipe fitting systems and methods

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KR101634507B1 (ko) 2016-06-28
TW201411019A (zh) 2014-03-16
JPWO2014013994A1 (ja) 2016-07-07
KR20150031450A (ko) 2015-03-24
TWI546483B (zh) 2016-08-21

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