WO2023007771A1 - Joint de tuyau résistant à la pression et procédé de raccordement de tuyau l'utilisant - Google Patents

Joint de tuyau résistant à la pression et procédé de raccordement de tuyau l'utilisant Download PDF

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Publication number
WO2023007771A1
WO2023007771A1 PCT/JP2022/003286 JP2022003286W WO2023007771A1 WO 2023007771 A1 WO2023007771 A1 WO 2023007771A1 JP 2022003286 W JP2022003286 W JP 2022003286W WO 2023007771 A1 WO2023007771 A1 WO 2023007771A1
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WIPO (PCT)
Prior art keywords
pipe
ring
insertion hole
pressure
joint
Prior art date
Application number
PCT/JP2022/003286
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English (en)
Japanese (ja)
Inventor
広行 若林
Original Assignee
Ｎｊｔ銅管株式会社
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Publication date
Application filed by Ｎｊｔ銅管株式会社 filed Critical Ｎｊｔ銅管株式会社
Publication of WO2023007771A1 publication Critical patent/WO2023007771A1/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
    • F16L21/00—Joints with sleeve or socket
    • F16L21/08—Joints with sleeve or socket with additional locking means
    • 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
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/091—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring provided with teeth or fingers
    • 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
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/12—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using hooks, pawls or other movable or insertable locking members

Definitions

  • the present invention relates to a pressure-resistant pipe joint and a pipe connection method using the same, and in particular, a pressure-resistant pipe joint that can be suitably used for connecting pipes through which fluid flows under high pressure, such as refrigerant pipes in air conditioners.
  • the present invention relates to a pipe joint structure and a method for connecting pipes, which is used to advantageously connect pipe bodies to be connected, and to exhibit excellent pressure resistance.
  • sockets, adapters, tee, T-shaped, Y-shaped, etc. have been used in order to connect piping for transporting fluids such as liquids and gases to other piping, or to connect to target equipment.
  • Various pipe joints called cross type, 90° elbow, etc. have been widely used. It has been done using joints.
  • the joint and the pipe to be connected can be connected by a simple caulking operation.
  • the connecting work has the advantage of being simpler and easier than the above-described brazing method.
  • a crimping tool press tool
  • the intended crimping work cannot be carried out.
  • workers need to carry a heavy caulking tool to the place where the joint and the pipe to be connected are connected. Further simplification of the caulking work is desired because it is necessary to support it with the operator's hand in order to fix it.
  • Japanese Patent Application Laid-Open No. 2000-249268 discloses a method for connecting a pipe and a joint body. At this time, the male thread formed on the joint main body is screwed into the female thread formed on the pressing body, and a lock ring or the like is sandwiched and fixed between the joint main body and the pressing body to connect them.
  • a joint has been proposed in which a pipe to be held is inserted into the joint body through such a pressing body, and a restricting piece of a lock ring is engaged with the outer peripheral surface of the pipe to prevent the pipe from coming off.
  • a cap member is screwed into the opening of the joint body, and a lock ring is sandwiched and fixed between the joint body and the cap member.
  • a pipe joint structure in which the pipe is inserted into the joint body through the cap member and the claws of the lock ring are bitten into the outer peripheral surface of the joint body to restrict the withdrawal of the inserted pipe is clearly known. It is
  • JP-A-2003-42369 as a one-touch joint, an O-ring and a regulating ring are sequentially inserted into one opening of a cylindrical joint body, and a ring-shaped holding member is further inserted.
  • the end of the opening of the joint body is crimped inward to reveal a joint structure in which the holding member is crimped and fixed, and should be connected within the opening of the joint body.
  • the tips of the regulating tongues of the regulating ring bite into the outer peripheral surface of the pipe, thereby preventing the pipe from coming off.
  • the O-ring sealing mechanism is arranged downstream in the direction of insertion of the pipe, the outer surface of the pipe passing through the regulation ring is scratched when the pipe is inserted. Since the scratched surface is sealed by the O-ring, there is an inherent problem that the sealing performance cannot be sufficiently exhibited.
  • the conventional insertion-type joint structure as described above it can be attached simply by inserting the connected pipe into the insertion hole of the joint main body. This is achieved by the restriction pieces or tongues of the lock ring or restriction ring biting into the outer peripheral surface of the pipe.
  • the lock ring and the restriction ring are arranged in multiple stages, or the restriction pieces or restriction tongues of the lock ring and the restriction ring are hardened or strengthened.
  • the insertion resistance of the pipe to be connected becomes excessive, and the problem arises that it becomes difficult for the operator to manually insert the pipe.
  • the larger the diameter of the connected pipe the greater the insertion resistance of the connected pipe.
  • an insertion force that cannot be inserted by a standard male force is required.
  • an insertion force of 0.6 kN or more is required. was extremely difficult.
  • JP-A-11-141760 Japanese Patent Publication No. 2003-524132 JP-A-2000-249268 JP 2019-90503 A JP-A-2003-42369
  • Another object of the present invention is to provide a pressure-resistant pipe joint capable of exhibiting excellent pressure resistance and pull-out prevention force without causing a large-diameter tube having an outer diameter exceeding 22.22 mm It is an object of the present invention to provide a pressure-resistant pipe joint that allows connection work to be performed using a normal force of an operator, even if it is a connecting pipe body, and furthermore, such a pressure-resistant pipe joint is used to connect pipes to be connected. The object is also to provide a method by which bodies can be advantageously connected in such a way that a high degree of sealing can be ensured.
  • the present invention can be preferably implemented in various aspects as listed below. Each aspect described below can be employed in any combination. It should be noted that the aspects and technical features of the present invention are not limited to those described below, and can be recognized based on the technical content disclosed in the entire specification and drawings. , should be understood.
  • the present invention provides (a) a tubular tubular body having an insertion hole in at least one end thereof, into which a tubular body to be connected is inserted and fixed from its tube end. a joint main body; and (c) a plurality of locking claws of the regulating ring arranged radially outward. is pushed and expanded to be fitted and arranged in the regulating ring, and when the connected tubular body is inserted, it is brought into contact with the pipe end of the connected tubular body and moved to the inner part of the insertion hole.
  • the guide structure is constructed so that the tubular body to be connected is alternatively disposed within the regulating ring, and a plurality of locking claws of the regulating ring can bite into the outer surface of the tubular body to be connected.
  • a tubular body positioned axially outside of the insertion hole relative to the restriction ring, the connected pipe disposed so as to be exposed to the inner surface of the insertion hole, and inserted into the insertion hole;
  • first sealing means consisting of an O-ring that contacts the outer surface of the body and seals between the outer surface of the pipe to be connected and the inner surface of the insertion hole; As the screwing progresses, the O-ring is pressurized and compressed in the axial direction of the insertion hole, thereby expanding the O-ring radially inward.
  • a pressure nut in the shape of a cylinder with a bottom having an insertion hole for the pipe to be connected to be inserted into the insertion hole formed in the bottom portion thereof, the pressurizing nut being pushed out to enhance the crimping property against the outer surface of the pipe to be connected;
  • the gist thereof is a pressure-resistant pipe joint characterized by:
  • the pipe body to be connected is provided on the inner surface of the insertion hole on the inner side of the arrangement position of the regulating ring. Stopper means are provided with which the guide cylinder, which is moved by the insertion, is brought into contact to prevent its movement.
  • the axis of the insertion hole is arranged in the direction
  • the regulating ring is provided radially integrally with an annular portion exhibiting an annular plate shape and an inner peripheral edge portion of the annular portion.
  • a plurality of tongue-shaped locking claws extending from the inner peripheral edge of the annular portion toward the center by a predetermined width, and extending in a predetermined width with respect to the insertion direction of the connected tubular body; is formed so as to bend and extend at an inclination angle of .
  • the restricting ring is provided on the inner surface of the insertion hole by a screw collar member that is screwed into a threaded portion provided on the inner surface of the insertion hole. It is held and fixed in contact with the formed stepped portion.
  • a V-packing member made of an elastic material and having a thick-walled tubular shape and a V-shaped portion opening at one end face in the axial direction of the second packing member is advantageous.
  • a sealing means is arranged between the threaded collar member and the O-ring, and is configured to seal between the inner surface of the insertion hole of the joint body and the outer surface of the connected pipe.
  • collar members are arranged on both axial sides of the insertion hole of the O-ring, and one of the collar members is provided with the pressure nut. Compression of the O-ring is effected by the application of pressure.
  • the pressure nut is formed in the bottom portion of the tubular body portion that is screwed onto the outer peripheral portion of the end portion of the joint body. It has a cylindrical pressing protrusion having an outer diameter smaller than the inner diameter of the end of the joint body and rising from the periphery of the hole at a predetermined height. It is configured to pressurize and compress the O-ring.
  • the pressurizing nut opens at the end face of the tubular body portion screwed onto the threaded portion provided on the outer peripheral surface of the end portion of the joint body. It has at least one notch, and when the pressure nut is screwed onto the joint body, part of the thread provided on the outer peripheral surface of the end of the joint body is exposed to the outside through the notch.
  • a notch has an arcuate shape that opens outward in the axial direction of the cylindrical body portion.
  • the insertion holes are provided on both axial end sides of the joint body, and at least the regulating ring and the Using the guiding cylinder, the first sealing means and the pressure nut, the two pipes to be connected are inserted into their respective insertion holes and fixed.
  • a method for connecting a predetermined pipe body to be connected using a pressure-resistant pipe joint having the structure as described above comprising: (i) the joint body in the pressure-resistant pipe joint; (ii) inserting the pipe end of the pipe to be connected into the insertion hole; While pushing out and moving to the inner part of the insertion hole, the connected tubular body is arranged in the regulating ring in place of the guide cylinder, and a plurality of the regulating rings are formed on the outer surface of the connected tubular body. and (iii) further screwing the pressure nut screwed onto the end of the joint body to move the O-ring in the axial direction of the insertion hole. and a step of pressurizing and compressing the O-ring to bulge it radially inward to enhance the crimping property against the outer surface of the pipe to be connected. is also the gist of it.
  • the plurality of locking claws of the regulating ring fixedly disposed in the insertion hole of the joint body are pushed outward in the radial direction.
  • a predetermined guide cylinder is arranged in the regulation ring
  • a target tube to be connected is inserted, and the guide tube is pressed by the end of the tube to be connected and inserted.
  • the pipe to be connected is fitted and positioned in the regulation ring in place of such a guide cylinder, and a plurality of pipes are provided on the outer surface of the pipe to be connected.
  • the locking claws are arranged so as to be able to bite into them, the operation of inserting and arranging the tubular body to be connected into the restricting ring can be relatively easily, simply and quickly carried out by the operator's hand. Therefore, even if the elastic force of the locking pawls of the regulating ring is increased or the regulating ring is arranged in a plurality of stages to enhance the locking action, the insertion hole of the joint main body does not move.
  • the operation of inserting the pipe body to be connected into the joint can be easily carried out by applying a normal force with the operator's bare hands, so that the joint can be advantageously used as a so-called one-touch joint.
  • the O-ring which is placed in the insertion hole of the joint body and seals between the inner surface of the insertion hole and the outer surface of the pipe to be connected into which is inserted, is closer to the inlet side of the insertion hole than the regulating ring.
  • the pressure nut screwed to the end of the joint body is further screwed in, pressurizing and compressing it in the axial direction of the insertion hole, and radially inwardly of the insertion hole Since it is designed to bulge out, it is possible to effectively improve the adhesion or crimping property to the outer peripheral surface of the inserted pipe to be connected. Therefore, the problem of leakage of the fluid flowing through the connected tubular body can be solved more advantageously without adopting it.
  • the O-ring is arranged on the rear side of the regulating ring in the insertion direction of the connected tubular body, the outer surface of the connected tubular body against which the O-ring is pressed has a regulating ring. There is no abrasion caused by the O-ring.
  • the insertion operation can be performed simply by an operator's bare hands without using a fire or a special dedicated tool.
  • the pipe to be connected and the pipe joint can be connected simply by inserting the pipe to be connected through the insertion hole provided in the pressure nut of the pipe joint and inserting it into the insertion hole of the joint body.
  • it can exhibit excellent pressure resistance and pull-out prevention force, it is advantageous for connecting pipes to be connected in which a fluid such as a high-pressure refrigerant flows through the pipe.
  • FIG. 2 is a schematic explanatory view showing a regulating ring used in the pressure-resistant pipe joint shown in FIG. (c) is an explanatory cross-sectional view taken along line AA in (a).
  • FIG. 2 is a schematic explanatory view showing a screw collar used in the pressure-resistant pipe joint shown in FIG.
  • FIG. 2 is a schematic explanatory view showing a V-packing used in the pressure-resistant pipe joint shown in FIG. 1, where (a) is a front explanatory view thereof, and (b) is a CC cross section in (a); It is an explanatory diagram.
  • FIG. 2 is a schematic explanatory view showing a pressure nut used in the pressure-resistant pipe joint shown in FIG. 1, (a) is a front explanatory view thereof, and (b) is DD in (a). It is cross-sectional explanatory drawing. 1.
  • FIG. 2 is an explanatory diagram of W0 used to calculate the O-ring compression rate, wherein (a) is a portion of the cross-sectional view shown in FIG. 1 showing W0 used to calculate the initial compression rate of the O-ring;
  • FIG. 8B is a cross-sectional partial explanatory view showing a state in which the copper pipe is removed in the lower drawing of FIG. 7, showing W0 used for calculating the final compression ratio of the O-ring;
  • FIG. 2 is an explanatory diagram of W0 used to calculate the O-ring compression rate, wherein (a) is a portion of the cross-sectional view shown in FIG. 1 showing W0 used to calculate the initial compression rate of the O-ring;
  • FIG. 8B is a cross-sectional partial explanatory view showing a state in which the copper pipe is removed in the lower drawing of FIG. 7, showing W0 used for calculating the final compression ratio of the O-ring;
  • FIG. 8B is a cross-sectional partial explanatory view showing a state in which the copper
  • FIG. 4 is an explanatory view showing another example of a pressure nut used in a pressure-resistant pipe joint according to the present invention, wherein (a), (b) and (c) are a front view, a left side view and a right side view, respectively; (d) and (e) are EE cross-sectional views and FF cross-sectional views in (c), respectively.
  • FIG. 4 is a cross-sectional explanatory view showing another example of a joint body used in the pressure-resistant pipe joint according to the present invention;
  • FIG. 1 shows a representative example of a pressure-resistant pipe joint according to the present invention, here in the form of a vertical cross-section of the left half thereof.
  • the pipe joint 10 comprises a joint body 12 having a cylindrical shape as a whole, and a three-stage regulating ring 14, a guide ring 16, a threaded collar 18, and a V-packing each arranged in the joint body 12. 20 , and an O-ring 22 and a pressure nut 24 threaded into the end opening of the fitting body 12 .
  • the other half of the joint body 12 (the right-hand portion, not shown in FIG. 1) has the same structure as the left-hand portion shown.
  • a copper pipe 26 made of a metallic material such as copper or a copper alloy is inserted into the pipe joint 10 to be connected.
  • the joint main body 12 which is one of the members constituting the pipe joint 10, is made of a metal tubular body having a predetermined length.
  • a tubular body to be connected here, a copper tube 26
  • the tubular bodies copper tube 26
  • a ring-shaped ridge 30 as stopper means protrudes from the inner peripheral surface at a predetermined height so as to be positioned in the axial center of the joint body 12. It is formed integrally with the inner peripheral surface of the joint main body 12 .
  • the projection 30 is for preventing the movement of the guide ring 16, which is moved to the deep part of the insertion hole 28 by the insertion of the copper tube 26, so that the guide ring 16 is brought into contact therewith. is.
  • the insertion hole 28 of the joint body 12 is opened toward the end of the joint body 12 by means of three stepped portions 28a, 28b, 28c so that the diameter increases stepwise. That is, the inner diameter of the insertion hole 28 is gradually increased from the first stepped portion 28a to the second stepped portion 28b and then to the third stepped portion 28c.
  • An inner female screw portion 32 to which the screw collar 18 is screwed is provided so as to be positioned between the second stepped portion 28b and the third stepped portion 28c.
  • a tapered portion 28d is provided to enable free elastic deformation of the restricting ring 14 radially outward (see FIG. 1).
  • an outer male threaded portion 34 is formed on the outer peripheral surface of the end portion of the joint main body 12, and a retainer having an arcuate cross section is positioned on the axially central side of the outer male threaded portion 34.
  • a projection 36 is formed on the outer peripheral surface, and a large-diameter portion having a stepped portion 38 is formed on the axially central side of the projection 36 .
  • the regulating ring 14 has an annular portion (base portion) 14a exhibiting an annular shape with a predetermined width, and the ring portion 14a extends from the inner peripheral edge of the annular portion 14a to the center.
  • a tongue-like piece extending in a predetermined width and bent at a predetermined inclination angle, for example, an angle of 36° to 38° with respect to the insertion direction (tube axis direction) of the copper pipe 26, which is the pipe to be connected.
  • a plurality of locking claws 14b are integrally provided radially. The inner diameter of the regulating ring 14 formed at the tips of the plurality of locking claws 14b is designed to be smaller than the outer diameter of the copper tube 26.
  • the regulating ring 14 is made of an elastic hard metal so that the locking claws 14b can bite into the outer surface of the copper tube 26, in other words, can be caught in the withdrawal behavior of the copper tube 26.
  • the locking claw 14b is elastically deformable because it is made of a material such as SUS301 or other metal material capable of exhibiting elasticity. Further, by forming the regulating ring 14 from a metallic material such as SUS301, it is possible to advantageously maintain the required pulling-out preventing force over a long period of time.
  • annular spacers 40 having a predetermined thickness that do not constrain the mutual elastic deformation of the restricting rings 14 are used. are arranged in the axial direction of the insertion hole 28 in a form in which they are brought into contact with the first stepped portion 28a of the insertion hole 28 in the joint body 12 via the .
  • the insertion force of the copper pipe 26 causes the engaging claws 14b of the regulating ring 14 to elastically move in diameter. While being pushed outward in the direction, the tip of the locking claw 14b bites or catches on the outer surface of the copper pipe 26, so that even if a pullout force acts on the copper pipe 26, it will slide smoothly. Poking out can be effectively prevented.
  • the screw collar 18 is made of a thick cylindrical metal cylinder. While the stepped portion 18b is formed, four tool holes 18c are formed with a phase difference of 90° so as to open at the end face on the side where the male screw portion 18a is provided.
  • the male threaded portion 18a provided on the outer peripheral surface of the screw collar 18 is rotated by a tool using the tool hole 18c so that the inner female threaded portion provided on the inner surface of the insertion hole 28 of the joint body 12 is engaged.
  • the three regulating rings 14 are formed between the end face opposite to the side where the tool hole 18c is provided and the first stepped portion 28a.
  • the screw collar 18 fixes the regulating ring 14, contributes to fixing the V-packing 20 described later, and also functions as a guide for the copper pipe 26 to be connected. When it vibrates, it also has a damping effect of alleviating the transmission of the vibration to the regulation ring 14, the O-ring 22, and the V-packing 20 as it is.
  • the guide ring 16 as a guide cylinder is arranged to move the regulation rings 14.
  • the plurality of locking claws 14b are fitted or fitted in the restricting ring 14 so as to expand radially outward.
  • the guide ring 16 is made of a softer metallic material than the regulating ring 14, and is made of the same material as the copper tube 26, such as copper or a copper alloy.
  • the guide ring 16 has an outer diameter substantially similar to that of the copper tube 26 into which the copper tube 26 is inserted.
  • the guide ring 16 is in a state in which a part of its axial length (a part on the front side in the push-in direction) is fitted and positioned in the insertion hole 28, and the regulation ring 14 so that even if the end face of the copper tube 26 is not in contact with the entire circumference of the end face of the guide ring 16 when the copper tube 26 is inserted, the guide ring 16 can be inserted. , without prying, can be pushed in smoothly and effectively.
  • the O-ring 22 is a ring having a circular cross section made of a rubber material such as H-NBR, and as shown in FIG.
  • the pressure nut 24 is screwed onto the outer peripheral portion of the end portion of the joint body 12 and pressed to abut on the third stepped portion 28c in the insertion hole 28 of the joint body 12.
  • the regulating ring 14 is located axially outside the insertion hole 28 and exposed to the inner surface of the insertion hole 28 .
  • the inner diameter of the O-ring 22, together with the inner diameter of the collar 42, is made smaller than the outer diameter of the copper tube 26 so that a seal can be achieved between the outer peripheral surface of the copper tube 26 into which it is inserted. It has become.
  • the V-packing disposed between the collar 42 on the side that contacts the third stepped portion 28c of the insertion hole 28 and the screw collar 18 20 has a thick-walled cylindrical shape made of a rubber material such as IIR, with a base 20a located on one axial side and a thicker wall extending from the base 20a on the other end side. It is integrally formed with a thick-walled seal portion 20b having a large outer diameter.
  • a circumferential groove 20c is formed so as to open to the end surface of the seal portion 20b, and the presence of this circumferential groove 20c provides a structure in which the cross section presents a substantially V-shape.
  • the V-packing 20 is attached so that the circumferential groove 20c faces the end face of the screw collar 18 on the side where the tool hole 18c is formed, so that the screw collar 18 and the collar 42 are connected. In between, it is arranged in an axially compressed form, thereby realizing a seal against the outer peripheral surface of the inserted copper tube 26, and when the internal pressure rises, the seal portion 20b bulges. to increase sealing performance. Therefore, the V-packing 20 functions as a secondary second sealing means when the O-ring 22 is used as the first sealing means.
  • the pressure nut 24 is made of the same metallic material as the joint body 12, and has a cylindrical shape with a bottom. It has an insertion hole 24a which is sized so as to allow the copper pipe 26 to be inserted therethrough.
  • a female screw portion 24b is provided on the inner peripheral surface of the cylindrical wall portion of the pressure nut 24, and a peripheral groove 24c having a predetermined depth is formed in the inner peripheral portion of the distal end portion of the cylindrical wall portion.
  • the bottom of the circumferential groove 24c serves as a thin portion 24d, and four anti-freezing holes 24e are provided in the circumferential direction with a phase difference of 90° through the thin portion 24d.
  • the tip of the cylindrical wall portion is formed into a hook portion 24f, and the inner surface thereof is formed into a tapered surface or an arcuate surface that expands outward.
  • a cylindrical pressing projection 44 on the inner surface of the bottom of the pressure nut 24, there is provided a cylindrical pressing projection 44 with a predetermined height that rises from there around the insertion hole 24a.
  • four rotational operation recesses 24g extending in the circumferential direction and having a predetermined depth with a phase difference of 90°.
  • the pressurizing nut 24 is attached to the end of the joint body 12 as shown in FIG. As a result, the pressing protrusion 44 provided on the inner surface of the bottom portion of the pressure nut 24 is brought into contact with the collar 42 located axially outward of the two collars 42, 42 sandwiching the O-ring 22, and Since the O-ring 22 is pressed, the O-ring 22 is accommodated and held at the end of the joint body 12 in a form sandwiched between the two collars 42, 42. It becomes.
  • the screwing of the pressure nut 24 to the end of the joint main body 12 is performed between the end surface of the cylinder wall portion of the pressure nut 24 and the stepped portion 38 provided on the outer peripheral surface of the joint main body 12, A predetermined gap is formed between the bottom inner surface of the nut 24 and the end surface of the joint body 12 in the axial direction. This is so that a desired compressive load can be applied to the O-ring 22 by further screwing the pressure nut 24 after the copper tube 26 is inserted.
  • the hook portion 24f formed at the tip of the cylindrical wall portion of the pressure nut 24 is positioned so as not to climb over the retainer projection 36 provided on the outer peripheral surface of the joint body 12 (enlarged view in FIG. 1). See), it will be stopped.
  • the tube 26 is further advanced from the position shown in FIG. 1 and inserted into the pipe joint 10 as shown in FIG. It is passed through the screw collar 18 so that the end face of the copper tube 26 abuts the end face of the guide ring 16 .
  • the guide ring 16 is pushed in and moved to the deep part of the insertion hole 28, while instead of the guide ring 16, the copper tube 26 is pushed and spread as it is. It will enter and be arranged in the three-tiered regulation ring 14 .
  • the locking claws 14b of the regulating ring 14 are elastically brought into contact with the outer surface of the copper pipe 26, and the locking claws 14b bite into the outer surface of the copper pipe 26.
  • a pull-out force acts on the copper tube 26
  • a large pull-out resistance can be exerted, and an excellent pull-out prevention force against the copper tube 26 is realized.
  • the guide ring 16 is moved to the deep part of the insertion hole 28 and contacts the protrusion 30, thereby preventing further movement.
  • the pressurizing nut 24 is turned by the operator's hand using a turning operation recess 24g provided on the outer periphery of the bottom portion, and the screwing is further advanced,
  • the O-ring 22 is pressurized and compressed in the axial direction of the insertion hole 28 via the collar 42 by the pressing force exerted by the cylindrical pressing projection 44 of the pressure nut 24.
  • the O-ring 22 bulges radially inward to increase the pressing force against the outer peripheral surface of the copper tube 26 .
  • the pressure nut 24 is further screwed into the O-ring 22 to pressurize and compress the pressure nut 24. As shown in the lower part of FIG. It is strongly pressed against the outer peripheral surface of the copper tube 26 while enlarging the pressure contact area thereof, thereby further enhancing the sealing between the outer peripheral surface of the copper pipe 26 and the inner surface of the insertion hole 28 .
  • the compression ratio of the O-ring 22 is generally about 25% ⁇ 5%, which is recognized to exhibit the most effective pressure resistance and durable life, and such a compression ratio is used.
  • the inner surface of the bottom of the pressure nut 24 and the end surface of the cylindrical wall portion thereof, the end surface of the joint body 10 and the stepped portion 38 are It is adapted to be abutted.
  • the hook portion 24f provided at the tip of the cylindrical wall portion of the pressure nut 24 climbs over the retaining projection 36 provided on the outer peripheral surface of the joint body 12, and the retaining projection 36 and the stepped portion are engaged.
  • the insertion operation of the copper tube 26 pushes and expands the plurality of locking claws 14b radially outward, and the guide ring 16, which is fitted and arranged in the regulation ring 14, is pushed by the end face of the copper tube 26.
  • the copper tube 26 is replaced by the guide ring 16, and it is only necessary to insert the copper tube 26 into the regulation ring 14. Therefore, when inserting the copper tube 26 into the regulation ring 14, A large insertion force is not required as in the case where the guide ring 16 is not present. Even if the pull-out preventing force of the copper tube 26 is increased, the operator can easily insert the copper tube 26 by hand.
  • the outer diameter of the copper pipe 26 is increased, it is necessary to increase its pull-out prevention force. It is possible to deal with it.
  • the larger the diameter of the copper tube 26 to be connected the greater the insertion resistance of the copper tube 26 .
  • the guide ring 16 is inserted and arranged in advance, and the presence of the guide ring 16 pushes and spreads the plurality of locking claws 14b of the regulation ring 14. Even if the outer diameter is 25.4 mm or more, the insertion resistance can be effectively reduced, and the insertion operation can be advantageously performed only by the operator's bare hands.
  • This reduction in insertion resistance has made it possible to increase the number of regulating rings 14 to be arranged, making it possible to be advantageously applied to the connection of high-pressure piping for CO 2 refrigerant with a flow pressure of 15 MPa. You can find great features there.
  • the seal between the copper pipe 26 to be connected and the pipe joint 10 is basically realized by the O-ring 22, and if necessary, As illustrated, the V-packing 20 only needs to be used as a secondary sealing means, so there are a plurality of locations where sealing is required as in the conventional structure, and therefore a large number of sealing means need to be provided. The problem of being there has been completely resolved. In addition, in order to reduce the insertion resistance of the copper tube 26, the initial compression rate of the O-ring 22 due to the screwing of the pressure nut 24 is kept low.
  • the initial compression rate of the O-ring 22 is generally desirably 15% or less, preferably 10% or less, so that the insertion resistance of the copper tube 26 can be effectively reduced. It will happen. Also, the lower limit of such an initial compressibility is generally about 5%. However, it causes problems such as easy entry into the joint main body 12 .
  • the compression ratio (%) of the O-ring 22 is represented by [(W0-W1)/W1] ⁇ 100, where W0 is the state where the copper tube 26 is not inserted (for example, FIG. 1 state), and W1 is the diameter of the O-ring 22 when the copper pipe 26 is inserted (for example, the state of FIG. 7) Width (thickness) in the direction.
  • the initial compression ratio (%) of the O-ring 22 shown in FIG. 1 is calculated using the value of W0 shown in FIG.
  • the final compression rate (%) of 22 is calculated using the value of W0 shown in FIG. 8(b).
  • W1 used for calculating the initial compression rate (%) and the final compression rate (%) are both calculated from the inner diameter of the third stepped portion 28c on which the O-ring 22 is arranged to the outside of the copper pipe 26. It is given by half the value obtained by reducing the diameter (see FIG. 7).
  • the O-ring 22 is opened as shown in the lower diagram of FIG. Since the space between the pressurizing nut 24 and the joint body 12, which is outside the space between the pressure nut 24 and the joint body 12, can be reduced as much as possible, condensed water enters from the outside, remains there, and enters Even if the joints and connecting copper pipes are distorted due to the freezing of the condensed water, the amount of distortion is extremely small and is within the range of elastic deformation of the joints and connecting copper pipes. From a certain point, it has high resistance to freezing and can be advantageously applied to the construction of refrigeration equipment, and can also advantageously contribute to shortening the construction time.
  • a pipe joint in which two copper pipes 26, which are pipe bodies to be connected, are linearly connected is described as an example, but the present invention is not limited to this.
  • a pressure nut 50 having a form as shown in (a) to (e) of FIG. 9 is also advantageously used.
  • the pressurizing nut 50 has an end surface of a cylindrical body portion 52 screwed to an outer male screw portion 34 provided on the outer peripheral surface of the end portion of the joint body 12 so as to make it easier for the operator to perform the turning operation.
  • a suitable number (at least one or more, here four) of open notches 54 are provided in the circumferential direction of the tubular portion 52 over a predetermined length and at predetermined intervals.
  • such notches 54 are desirably formed in an arc shape as shown, but can also be formed in various other external shapes such as oval, rectangular, and triangular.
  • FIG. 10 shows an example of a joint main body in a pipe joint according to the present invention, which is used in different examples of connection forms of pipe bodies to be connected.
  • the joint body 12' has a cylindrical shape, and one axial end of the joint body 12' has a structure similar to that of the above-described embodiment for connection with the copper pipe 26, which is the pipe to be connected.
  • the outer peripheral surface of the other end is simply formed with a threaded portion 48, and this threaded portion 48 is used for connection to other piping systems and fluid flow of equipment. It is screwed to the inlet/outlet port, so that a predetermined connection pipe body (copper pipe 26) can be connected.
  • the pipe body to be connected may be a pipe body made of an aluminum material made of aluminum or its alloy, and in general, a pipe made of a soft metal material is advantageous.
  • the material of the regulating ring 14 is not limited to SUS material, and a metallic material harder than the pipe body to be connected is advantageously adopted.
  • the restricting ring 14 is by no means limited to the structure shown in the example. However, it should be appropriately selected so that effective pressure resistance and pull-out prevention force can be exhibited according to the diameter of the copper pipe 26 to be connected and the pressure of the fluid flowing therethrough. , use in three stages as illustrated, use in one stage, and use in a plurality of stages.
  • a plurality of regulating rings 14 are inserted into the insertion hole 28 of the joint body 12 in a form in which a spacer 40 having a predetermined thickness is interposed between the annular portions 14a that are the bases of the regulating rings 14.
  • spacers 40 are not necessarily required if a proper spacing can be ensured between adjacent regulating rings 14, 14, for example, annular portion 14a. By increasing the thickness of , it is possible to form a predetermined gap between them.
  • a V-packing 20 is provided as a supplemental sealing means, and along with securing the restricting ring 14, to apply the desired compressive force to the V-packing 20.
  • the screw collar 18 is provided, the V-packing 20 and the screw collar 18 are provided as required and are not necessarily required in the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Joints With Pressure Members (AREA)

Abstract

L'invention concerne un raccord de tuyau résistant à la pression capable de présenter une excellente résistance à la pression et une excellente force de prévention contre le retrait sans nécessiter l'utilisation d'un feu ou l'utilisation d'un outil dédié dans la connexion d'un corps de tuyau à connecter.　Un raccord de tuyau résistant à la pression 10 comprend : un corps principal de joint 12 qui est inséré dans un tuyau en cuivre 26 et fixé à celui-ci ; une bague de restriction 14 pourvue d'une pluralité de griffes de verrouillage qui empêchent le tuyau en cuivre 26 d'être retiré ; une bague de guidage 16 configurée pour être montée sur la bague de restriction 14 et placée dans celle-ci et déplacée vers une partie interne d'un trou d'insertion 28 par l'insertion du tuyau en cuivre 26 de telle sorte que le tuyau en cuivre 26 remplace la bague de guidage 16 et est placé dans la bague de restriction 14 ; un Joint torique 22 qui est positionné sur le côté axialement extérieur de la bague de restriction 14 dans le trou d'insertion 28 et qui scelle un espace entre le tuyau en cuivre 26 et le trou d'insertion 28 ; et un écrou de mise sous pression 24 qui est en prise par filetage avec le corps principal de joint 12 et qui met sous pression et comprime le joint torique par l'intermédiaire de la progression de la prise filetée.
PCT/JP2022/003286 2020-08-04 2022-01-28 Joint de tuyau résistant à la pression et procédé de raccordement de tuyau l'utilisant WO2023007771A1 (fr)

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JP2020132258 2020-08-04
JP2021-121261 2021-07-26
JP2021121261A JP7057855B2 (ja) 2020-08-04 2021-07-26 耐圧型管継手及びそれを用いた管接続方法

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WO2023007771A1 true WO2023007771A1 (fr) 2023-02-02

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06147374A (ja) * 1992-11-12 1994-05-27 Tokyo Gas Co Ltd 管継手
JPH11351466A (ja) * 1998-06-05 1999-12-24 Onda Seisakusho:Kk ロックリング
US6450550B1 (en) * 1999-09-09 2002-09-17 R. Conrader Company Tube fitting
US20060232067A1 (en) * 2003-02-17 2006-10-19 Byung-Woon Kwak Pipe clamping device
US20090021001A1 (en) * 2007-07-18 2009-01-22 Seung-Il Oh Coupling device for circular pipes
JP2009180273A (ja) * 2008-01-30 2009-08-13 Jfe Pipe Fitting Mfg Co Ltd 差込み式管継手
JP2010002022A (ja) * 2008-06-23 2010-01-07 Kitz Corp 樹脂管用ワンタッチ継手
JP2011132981A (ja) * 2009-12-22 2011-07-07 Kitz Corp 樹脂管用ワンタッチ継手
US20140232110A1 (en) * 2011-09-30 2014-08-21 Woojung Mechatronics Co., Ltd Pipe connector assembly and method for connecting a pipe using the same
JP2019090503A (ja) * 2017-11-16 2019-06-13 株式会社タブチ 管継手

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06147374A (ja) * 1992-11-12 1994-05-27 Tokyo Gas Co Ltd 管継手
JPH11351466A (ja) * 1998-06-05 1999-12-24 Onda Seisakusho:Kk ロックリング
US6450550B1 (en) * 1999-09-09 2002-09-17 R. Conrader Company Tube fitting
US20060232067A1 (en) * 2003-02-17 2006-10-19 Byung-Woon Kwak Pipe clamping device
US20090021001A1 (en) * 2007-07-18 2009-01-22 Seung-Il Oh Coupling device for circular pipes
JP2009180273A (ja) * 2008-01-30 2009-08-13 Jfe Pipe Fitting Mfg Co Ltd 差込み式管継手
JP2010002022A (ja) * 2008-06-23 2010-01-07 Kitz Corp 樹脂管用ワンタッチ継手
JP2011132981A (ja) * 2009-12-22 2011-07-07 Kitz Corp 樹脂管用ワンタッチ継手
US20140232110A1 (en) * 2011-09-30 2014-08-21 Woojung Mechatronics Co., Ltd Pipe connector assembly and method for connecting a pipe using the same
JP2019090503A (ja) * 2017-11-16 2019-06-13 株式会社タブチ 管継手

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JP2022029434A (ja) 2022-02-17

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