JP6387252B2 - Fittings and ferrules - Google Patents

Description

  The present invention relates to a joint used for connecting a pipe such as a fluid pipe through which a fluid passes.

  In connection with fluid pipes, various single ferrule-type joints have been proposed in order to reduce costs by reducing the number of parts and to facilitate installation work.

  Patent Document 1 discloses a single ferrule having a rising portion including a first end portion and an intermediate portion having a larger inner diameter than the first end portion and the second end portion between the first end portion and the second end portion. A coupling is disclosed. When the ferrule is pressed from the second end side by tightening the nut, the ferrule is deformed by expanding the diameter of the intermediate portion, and the rising portion rises so as to increase the angle formed with the outer peripheral surface of the pipe. As a result, the first end bites into the pipe well due to the lever principle, and the sealing performance between the joint and the pipe is enhanced.

Japanese Patent Laying-Open No. 2014-29165 (FIG. 3)

  However, as can be seen from FIG. 3 of Patent Document 1, as the shape of the rising portion of the ferrule, the rising portion already has a certain angle with the outer peripheral surface of the pipe before the nut is tightened. Accordingly, the movable range of the rising portion is limited, and the angle at which the rising portion can rise by tightening the nut is limited to be small. This makes it difficult to bite the first end into the tube.

  In order to increase the angle at which the rising portion rises, the space above the ferrule may be enlarged to increase the movable range of the rising portion. However, this increases the size of the entire joint.

  An object of the present invention is to provide a technique that enables a large bite driving with a small size in a joint using a ferrule that bites and drives an end portion into a pipe by deformation.

  In order to solve the above problems, a joint according to an aspect of the present invention is a joint connected to a pipe, and includes a first member having a through hole that receives the pipe, a through hole that receives the pipe, A second member that is screw-coupled to the first member so that the central axis of the through hole coincides with the central axis of the through hole of the first member; and a through hole that communicates from the first end that receives the tube to the second end And there is a portion having an inner diameter larger than the first end and the second end between the first end and the second end, and the central axis of the through hole is the first member and A ferrule disposed in a storage space formed by the inner peripheral surface of the first member, the inner peripheral surface of the second member, and the outer peripheral surface of the pipe, in alignment with the central axis of the second member. The ferrule has the first end and the same inner diameter and outer diameter as the first end A rising portion including a first cylindrical portion extending in a direction, a pressed portion closer to the second end portion than the rising portion, and a portion having an inner diameter larger than that of the first end portion and the second end portion. There is an intermediate portion that connects the rising portion and the pressed portion, and the first member has a first tapered inner circumferential surface that is a tapered inner circumferential surface that contacts the first end of the ferrule. And the second member has a pressing portion that presses at least a part of the pressed portion of the ferrule, and the storage space stores the ferrule and has outer peripheries of the first cylindrical portion and the tube. There is a permissible space in which the rising portion can be raised so as to increase an angle formed with a surface, and when the screw connection between the first member and the second member is tightened, the rising portion of the ferrule rises, Of the first end The inner periphery of the first end portion of the peripheral as a fulcrum to rotate as the point of action, driven bite toward the outer periphery of the tube.

  According to the present invention, in a joint using a ferrule that bites and drives an end portion into a pipe by deformation, a large biting drive can be performed with a small size.

It is sectional drawing of the coupling by 1st Embodiment. It is sectional drawing which shows the state of the joint after attaching the joint to the pipe | tube in 1st Embodiment. In 1st Embodiment, it is a figure for demonstrating the operation | movement and effect | action of each part when a coupling is assembled | attached to a pipe | tube. It is a figure for demonstrating the principle by which a ferrule is driven in toward a pipe | tube. It is a figure for demonstrating the principle by which a ferrule is driven in toward a pipe | tube. It is sectional drawing of the coupling by 2nd Embodiment. It is sectional drawing which shows the state of the joint after attaching the joint to the pipe | tube in 2nd Embodiment. In 2nd Embodiment, it is a figure for demonstrating the operation | movement and effect | action of each part when a coupling is assembled | attached to a pipe | tube.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)

  FIG. 1 is a cross-sectional view of a joint according to the first embodiment. Referring to FIG. 1, the joint 10 includes a joint body 11, a nut 12, and a ferrule 13 each having a cylindrical shape. The joint is used in connection with a pipe for the purpose of connecting the pipe through which a fluid passes.

  The joint body 11 and the nut 12 are screwed together and can be tightened or loosened. The joint body 11, the nut 12, and the ferrule 13 have a through hole that receives the pipe 20. The joint 10 includes a nut 12, a ferrule 13, and a ferrule 13 so that the ferrule 13 is accommodated in a storage space formed by the inner peripheral surface 11 a of the joint body 11, the inner peripheral surface 12 a of the nut 12, and the outer peripheral surface 20 a of the pipe 20. When the pipe 20 is received in the order of the joint body 11 and the screw connection between the joint body 11 and the nut 12 is tightened, the pipe 20 is connected.

  The ferrule 13 includes a rising portion 13c, an intermediate portion 13e, and a pressed portion 13d between a front end portion (first end portion) 13a and a rear end portion (second end portion) 13b. The thickness of the ferrule 13 is substantially constant from the front end portion 13a to the rear end portion 13b. Here, the joint body 11 side is the front, and the nut 12 side is the rear.

  Between the front end portion 13a and the rear end portion 13b of the ferrule 13, there is a region having a larger inner diameter than the front end portion 13a and the rear end portion 13b. The rising portion 13c includes a front end portion 13a and a cylindrical portion 13c1 (first cylindrical portion) that has the same inner diameter and outer diameter as the front end portion 13a and extends in the axial direction. A tapered cylindrical portion 13c2 whose inner diameter and outer diameter increase toward the rear is connected to the rear of the cylindrical portion 13c1.

  The pressed portion 13d is a region where the inner diameter and the outer diameter gradually decrease toward the rear.

  The intermediate portion 13e is a region between the rising portion 13c and the pressed portion 13d, and has an inner diameter and an outer diameter that are substantially constant, and includes a portion having the largest inner diameter of the ferrule 13.

  The joint body 11 has a tapered inner peripheral surface 11 b that is a tapered inner peripheral surface that abuts against the front end portion 13 a of the ferrule 13. The taper inner peripheral surface 11b is configured such that the inner diameter increases toward the rear.

  The nut 12 includes a coupling portion 12B that is screw-coupled to the joint body 11, and a protruding portion 12C that projects inward from the inner peripheral surface 12a of the coupling portion 12B. The protruding portion 12 </ b> C has a pressing portion 12 </ b> D that presses at least a part of the pressed portion 13 d of the ferrule 13.

  The pressing portion 12D has a tapered inner peripheral surface 12b that is a tapered inner peripheral surface that presses the pressed portion 13d of the ferrule 13. The tapered inner peripheral surface 12b and the pressed portion 13d of the ferrule 13 form a predetermined angle α on a plane passing through the central axis. The angle α is set to an appropriate value according to the set values of various parameters such as the thickness of the ferrule 13, the length of the intermediate portion 13e, the shape of the pressed portion 13d, and the shape of the pressing portion 12D of the nut 12. That's fine.

  When the joint body 11 and the nut 12 are finger tight, the ferrule 13 is housed in the housing space, the outer diameter of the intermediate portion 13e is further increased, and the rising portion 13c is formed with the outer peripheral surface of the pipe 20. There is an acceptable space 15 that can be raised to increase the angle. The finger tight state is a state in which the screw connection between the joint body 11 and the ferrule 13 is tightened to such an extent that the joint body 11 and the ferrule 13, the ferrule 13 and the nut 12 abut, but the ferrule 13 is not deformed.

  In the present embodiment, as an example, as the allowable space 15, the first allowable space 15a that can rise so as to increase the angle formed by the cylindrical portion 13c1 of the rising portion 13c and the outer peripheral surface 20a of the tube 20; In this example, there are two spaces, a second allowable space 15b for increasing the outer diameter of the intermediate portion 13e in order to raise the rising portion 13c. The first allowable space 15a is a space outside the rising portion 13c (upward in FIG. 1), and the second allowable space 15b is a space outside the intermediate portion 13e (upper in FIG. 1). However, the present invention is not limited to this example. As another example, the first allowable space 15a is provided but the second allowable space 15b is not provided. However, since the first allowable space 15a is provided, the joint capable of rising of the rising portion 13c may be used.

  The central axes of the nut 12, ferrule 13, and joint body 11 are aligned, and the pipe 20 is received in the order of the nut 12, ferrule 13, joint body 11, and screw coupling between the joint body 11 and the nut 12 is performed from the finger tight state. When a predetermined amount of tightening is performed with a predetermined tightening torque, as shown in FIG. 2, the front end portion 13 a of the ferrule 13 bites into the tube 20 to form a seal, and the joint 10 is connected to the tube 20.

  According to the present embodiment, since the intermediate portion 13e of the ferrule 13 has a portion with a large inner periphery, the ferrule 13 pushed by the nut 12 causes the intermediate portion 13e to bulge outward while abutting against the joint body 11, and the rising portion The cylindrical portion 13c1 of 13c rises. When the cylindrical portion 13c1 rises, the outer periphery of the front end portion 13a abuts against the tapered inner peripheral surface 11b of the joint body 11, and the progress is limited. Therefore, the inner peripheral portion of the front end portion 13a that abuts the tube 20 is the tube. The force driven to bite into 20 is efficiently generated, and the joint 10 is connected to the pipe 20 in a state where a sealing property is obtained.

  At this time, the cylindrical portion 13c1 rises from a position where the angle formed by the cylindrical portion 13c1 and the outer peripheral surface 20a of the tube 20 is zero, so that the radial direction of the storage space (vertical direction in FIG. 1) using the storage space effectively. It is possible to stand up at a large rising angle with respect to the length of and to obtain good bite driving. This makes it possible to achieve equivalent sealing performance with a small-sized joint, or to obtain higher sealing performance with an equivalent-sized joint.

  Hereinafter, the operation and action of each part when the joint 10 is assembled to the pipe 20 will be further described.

  As shown in FIG. 1, the cylindrical portion 13c1 is followed by a tapered cylindrical portion 13c2 whose inner diameter and outer diameter increase toward the rear, and further behind the cylindrical portion 13c2 is an inner diameter and an outer diameter. An intermediate portion 13e (third cylindrical portion) having a uniform diameter and extending in the axial direction continues. As described above, in the finger tight state, the tapered inner peripheral surface 12b of the nut 12 and the pressed part 13d of the ferrule 13 form a predetermined angle α on a plane passing through the central axis.

  FIG. 3 is a diagram for explaining the operation and action of each part when the joint is assembled to the pipe in the first embodiment.

  As shown in FIG. 3, when the screw connection between the joint body 11 and the nut 12 is tightened, the pressing portion 12D of the nut 12 pushes the pressed portion 13d of the ferrule 13 forward by the force F1 generated in the axial direction. As a reaction, the ferrule 13 is pushed backward by the joint body 11.

  The ferrule 13 whose front end portion 13a is pushed rearward and whose pressed portion 13d is pushed forward increases the inner diameter and outer diameter of the intermediate portion 13e by the force F2 derived from the force F1, and the front end portion 13a and the rear end It deform | transforms so that the edge part 13b may approach. At this time, the inner diameter 12b of the ferrule 13 has a tapered shape whose inner diameter decreases toward the rear, and the pressing portion 12D forms a predetermined angle α on the plane passing through the central axis with the pressed portion 13d of the ferrule 13. Presses the pressed portion 13d, so that the ferrule 13 is deformed to reduce the angle α. Guided by the deformation, the connecting portion between the cylindrical portion 13c2 and the intermediate portion 13e is deformed, and the rising portion 13c including the cylindrical portion 13c1 rises.

  In this way, the intermediate portion 13e is deformed by the deformation of the rear portion of the ferrule 13 generated by the pressing portion 12D pressing the pressed portion 13d, and the rising portion 13c is raised, so that the deformation operation of the ferrule 13 is stabilized. The intended bite drive can be surely caused. As in this embodiment, the difference between the inner diameter of the front end portion 13a of the ferrule 13 and the largest inner diameter of the intermediate portion 13e is small, and the cylindrical portion 13c1 rises from a position where the angle formed with the outer peripheral surface 20a of the tube 20 is zero. Even in this case, the intended bite driving can be surely caused by the stable deformation of the ferrule 13.

  At this time, the intermediate portion 13e of the ferrule is deformed so that the front and rear diameters thereof are larger than the rear as shown in FIG.

  At this time, the rising portion 13c increases the angle formed with the outer peripheral surface 20a of the tube 20 until the angle of the outer peripheral surface of the cylindrical portion 13c1 matches the angle of the tapered inner peripheral surface 11b of the joint body 11. Stand up to. As the cylindrical portion 13c1 of the rising portion 13c rises, the outer peripheral portion that comes into contact with the tapered inner peripheral surface 11b of the joint body 11 is limited by the tapered inner peripheral surface 11b and the inner peripheral portion that comes into contact with the tube 20 at the front end portion 13a. Is driven to bite into the tube. In other words, at the front end portion 13a of the ferrule 13, the outer peripheral portion serves as a fulcrum and the inner peripheral portion serves as an action point, and the ferrule 13 is driven into the tube 20 by a strong force according to the lever principle.

  On the other hand, the rear end portion 13 b moves on the outer peripheral surface 20 a of the tube 20 without biting into the tube 20.

  Further, since the deformed ferrule 13 retains some elastic force to return to its original shape, the ferrule 13 and the joint body 11 are pressed against each other, and the ferrule 13 and the nut 12 are pressed against each other. As a result, the joint 10 can be prevented from loosening from the pipe 20 due to vibration or the like. Further, since the elastic deformation of the ferrule 13 disappears when it is returned to the finger tight state, the nut 12 and the ferrule 13 do not pop out by the elastic force when the joint 10 is removed.

  Next, the principle that the ferrule 13 is driven into the tube 20 in this embodiment will be described. 4 and 5 are diagrams for explaining the principle that the ferrule is driven to bite toward the tube.

  As shown in FIG. 4, the ferrule 13 of the present embodiment includes a member 13 c ′ simulating a rising portion 13 c and a member 13 ′ ′ simulating a pressed portion 13 d in the longitudinal direction as shown in FIG. 4. It can be considered as a structure in which one end is connected by a connection point 13e 'and further connected by an elastic body 13g' at the intermediate point between the member 13c 'and the member 13d'. In this structure, the member 13c ′ and the member 13d ′ maintain a predetermined angle by the elastic force of the elastic body 13g ′ when no external force is applied.

  When the joint body 11 restricts the leftward movement of the tip 13a 'of the member 13c' and a force F1 is applied to the member 13d 'in the left direction in the figure, the elastic body 13g' is contracted and the connection point 13e 'is raised upward. The pushing force F2 is derived. As a result, a counterclockwise rotational movement occurs at the tip 13a ′ of the member 13c ′.

  Referring to the enlarged view of the vicinity of the tip 13a 'shown in FIG. 5, in the state where the entire member 13c' is pressed against the pipe 20 and the joint body 11, the tip 13a 'of the member 13c' undergoes a rotational motion, and the fulcrum 13h ' The action point 13 i ′ is rotated around the center and the action point 13 i ′ is driven to bite into the tube 20.

  In the present embodiment, the intermediate portion 13e includes a cylindrical portion having a substantially constant inner diameter and outer diameter. However, the present invention is not limited to this, and the intermediate portion 13e only needs to include a portion having the largest inner diameter of the ferrule 13, and even if there is no cylindrical portion having a substantially constant inner diameter and outer diameter. Good. As a modification, a tapered cylindrical portion whose inner diameter and outer diameter are reduced toward the rear may be connected to the rear of the cylindrical portion 13c2. The tapered cylindrical portion itself may form the pressed portion 13d. Even in this configuration, when the screw connection between the joint body 11 and the nut 12 is tightened, the connecting portion between the cylindrical portion 13c1 and the tapered cylindrical portion behind the deformed portion is deformed, and the rising portion 13c including the cylindrical portion 13c1 is formed. Since it rises, the operation of the ferrule 13 is stabilized, and the intended bite drive can be caused.

(Second Embodiment)

  The joint of the second embodiment is improved with respect to that of the first embodiment in order to prevent the direction of attachment of the ferrule during construction and to prevent the ferrule from being lost. . That is, a configuration is employed in which the ferrule is fitted to the nut and does not easily fall off. And a fitting part acts also as a mechanism for guide | inducing the appropriate deformation | transformation of a ferrule.

  FIG. 6 is a cross-sectional view of the joint according to the second embodiment. Referring to FIG. 6, the joint 10 of the second embodiment has a joint body 11, a nut 12, and a ferrule 13 each having a cylindrical shape, as in the first embodiment.

  The joint main body 11 of the second embodiment is the same as that of the first embodiment. The ferrule 13 and the nut 12 of the second embodiment are different from those of the first embodiment in that they include a mechanism that fits together.

  The joint body 11 and the nut 12 are screwed together and can be tightened or loosened. The joint body 11, the nut 12, and the ferrule 13 have a through hole that receives the pipe 20. The joint 10 includes a nut 12, a ferrule 13, and a ferrule 13 so that the ferrule 13 is accommodated in a storage space formed by the inner peripheral surface 11 a of the joint body 11, the inner peripheral surface 12 a of the nut 12, and the outer peripheral surface 20 a of the pipe 20. When the pipe 20 is received in the order of the joint body 11 and the screw connection between the joint body 11 and the nut 12 is tightened, the pipe 20 is connected.

  The ferrule 13 has a rising portion 13c, an intermediate portion 13e, a pressed portion 13d, and a fitting portion 13f between a front end portion (first end portion) 13a and a rear end portion (second end portion) 13b. ing. This fitting portion 13f is a portion that is not present in the first embodiment.

  Between the front end portion 13a and the rear end portion 13b of the ferrule 13, there is a region having a larger inner diameter than the front end portion 13a and the rear end portion 13b. The rising portion 13c includes a front end portion 13a and a cylindrical portion 13c1 (first cylindrical portion) that has the same inner diameter and outer diameter as the front end portion 13a and extends in the axial direction. A tapered cylindrical portion 13c2 whose inner diameter and outer diameter increase toward the rear is connected to the rear of the cylindrical portion 13c1.

  The pressed portion 13d is a region where the inner diameter and the outer diameter gradually decrease toward the rear. The intermediate portion 13e is a region between the rising portion 13c and the pressed portion 13d, and has an inner diameter and an outer diameter that are substantially constant and includes a portion having the largest inner diameter.

  The fitting portion 13f includes a rear end portion 13b and extends rearward from the rear end of the pressed portion 13d. The fitting portion 13f extends so as to incline at an angle β with respect to the central axis of the through hole, and is configured such that the inner diameter and the outer diameter gradually increase toward the rear end portion 13b.

  The outer periphery of the front end portion 13a and the outer periphery of the rear end of the fitting portion 13f are rounded.

  The nut 12 includes a coupling portion 12B that is screw-coupled to the joint main body 11, and a protruding portion (fitted portion) 12C that projects inward from the inner peripheral surface 12a of the coupling portion 12B. The protruding part 12C has a pressing part 12D that presses at least a part of the pressed part 13d of the ferrule 13, and a notch 12e is formed inside the pressing part 12D. This notch 12e is a portion that was not present in the first embodiment.

  The notch 12e is formed continuously around the inner peripheral surface of the protruding portion 12C. By fitting the fitting portion 13f of the ferrule 13 in the notch 12e, the nut 12 and the ferrule 13 are integrated. At the rear end of the notch 12e, there is a tapered pressing portion 12E whose inner diameter decreases toward the rear.

  As a normal usage mode of this embodiment, before the operation of assembling the joint 10 to the pipe 20, the ferrule 13 is fitted to the nut 12 and they are integrated. At that time, the fitting portion 13f is press-fitted into the notch 12e while being elastically deformed, and is fitted. Specifically, the fitting portion 13f is press-fitted into the notch 12e, and a part of the outer peripheral surface of the fitting portion 13f is brought into contact with a contacted surface 12f constituting a part of the notch 12e. The joint portion 13f is fitted to the protruding portion (fitted portion) 12C.

  The pressing portion 12 </ b> D has a tapered inner peripheral surface that is a tapered inner peripheral surface that presses the pressed portion 13 d of the ferrule 13. The tapered inner peripheral surface and the pressed portion 13d of the ferrule 13 form a predetermined angle α on a plane passing through the central axis.

  When the joint body 11 and the nut 12 are finger tight, the ferrule 13 is housed in the housing space, the outer diameter of the intermediate portion 13e is further increased, and the angle formed by the rising portion 13c with the outer peripheral surface of the pipe 20 There is a permissible space 15 that can only be raised to increase. The finger tight state is a state in which the screw connection between the joint body 11 and the ferrule 13 is tightened to such an extent that the joint body 11 and the ferrule 13 and the ferrule 13 and the nut 12 are in contact with each other but the ferrule 13 is not deformed. .

  The central axes of the nut 12, ferrule 13, and joint body 11 are aligned, and the pipe 20 is received in the order of the nut 12, ferrule 13, joint body 11, and screw coupling between the joint body 11 and the nut 12 is performed from the finger tight state. When a predetermined amount of tightening is performed with a predetermined tightening torque, as shown in FIG. 7, the front end portion 13 a of the ferrule 13 bites into the tube 20 to form a seal, and the joint 10 is connected to the tube 20.

  Hereinafter, the operation and action of each part when the joint 10 is assembled to the pipe 20 will be further described. FIG. 8 is a diagram for explaining the operation and action of each part when the joint is assembled to the pipe in the second embodiment.

  As shown in FIG. 8, when the screw connection between the joint body 11 and the nut 12 is tightened, the pressing portion 12D of the nut 12 pushes the pressed portion 13d of the ferrule 13 forward by the force F1 generated in the axial direction. Further, the pressing portion 12E of the nut 12 pushes the rear end portion 13b of the ferrule 13 forward. The ferrule 13 whose pressed portion 13d and the rear end portion 13b are pressed pushes the front joint body 11 forward accordingly. As a reaction, the ferrule 13 is pushed backward by the joint body 11.

  The ferrule 13 whose front end portion 13a is pushed rearward and whose pressed portion 13d and rear end portion 13b are pushed forward increases the inner and outer diameters of the intermediate portion 13e by the force F2 derived from the force F1. It deform | transforms so that the edge part 13a and the rear-end part 13b may approach.

  At this time, the inner diameter 12b of the ferrule 13 has a tapered shape whose inner diameter decreases toward the rear, and the pressing portion 12D forms a predetermined angle α on the plane passing through the central axis with the pressed portion 13d of the ferrule 13. Presses the pressed portion 13d, so that the ferrule 13 is deformed to reduce the angle α. Guided by the deformation, the connecting portion between the cylindrical portion 13c2 and the intermediate portion 13e is deformed, and the rising portion 13c including the cylindrical portion 13c1 rises. In the second embodiment, the operation in which the front end portion 13a is driven toward the tube 20 by the rising of the rising portion 13c is the same as that of the first embodiment.

  In the second embodiment, the fitting portion 13e of the ferrule 13 has an inner diameter that increases at an angle β toward the rear. When the screw connection between the joint body 11 and the nut 12 is tightened, the fitting portion of the nut 12 The fitting portion also presses the vicinity of the rear end 13 b of the fitting portion 13 e of the ferrule 13 in the direction of the tube 20. As a result, the ferrule 13 is deformed to reduce the angle β. Therefore, the rear end portion 13b of the ferrule 13 is pressed toward the tube 20 to induce deformation of the ferrule 13, and the intermediate portion 13e is stably driven outwardly, so that the front end portion 13a is connected to the tube 20. The intended bite drive can be surely caused.

  Moreover, in 2nd Embodiment, the to-be-fitted part of the nut 12 is a notch containing the taper-shaped part which an internal diameter reduces as it goes back. With this configuration, the fitting portion presses the fitting portion 13f of the ferrule 13 toward the pipe 20 by tightening the screw connection, so that the deformation of the ferrule 13 can be favorably induced.

  In this way, the pressing portion 12D presses the pressed portion 13d, and the pressing portion 12E is guided by the deformation of the rear portion of the ferrule 13 generated by pressing the rear end portion 13b, so that the intermediate portion 13e is deformed, and the rising portion 13c. Therefore, the deformation operation of the ferrule 13 is stabilized, and the intended bite driving can be surely caused. As in this embodiment, the difference between the inner diameter of the front end portion 13a of the ferrule 13 and the maximum inner diameter of the intermediate portion 13e is small, and the cylindrical portion 13c1 rises from a position where the angle formed with the outer peripheral surface 20a of the tube 20 is zero. Even in this case, the intended bite driving can be surely caused by the stable deformation of the ferrule 13.

  Further, when the screw connection between the joint main body 11 and the nut 12 is tightened, the rising portion 13c of the ferrule 13 rises, rotates with the outer periphery of the front end portion 13a as a fulcrum and the inner periphery of the front end portion 13a as a point of action. Since the bite is driven toward the outer periphery of the belt 20, a strong biting force is generated at the inner circumference of the front end portion 13a serving as an action point, and a good sealing mechanism is realized.

  At that time, the fitting portion 13f moves on the outer peripheral surface 20a of the pipe 20 and approaches the front end portion 13a without biting into the pipe 20 when tightening the screw connection between the joint body 11 and the nut 12. . Therefore, the rising portion 13c can be raised smoothly, and the front end portion 13a can be driven into the outer periphery of the tube 20 well, so that the bite is strongly bitten on the inner periphery of the front end portion 13a serving as an action point. Force is generated and a good sealing mechanism is realized.

  As the inner diameter and outer diameter of the intermediate portion 13e increase, the pressed portion 13d rises, the intermediate portion 13e and the pressed portion 13d are pressed by the pressing portion 12D, and the rear end portion 13b is pressed by the pressing portion 12E. Therefore, the inner peripheral surface of the fitting portion 13f comes into contact with the outer peripheral surface 20a of the tube 20 (FIG. 7). Thereby, the fitting state of the fitting part 13f and the protrusion part 12C (notch 12e) is eliminated. Therefore, even if the nut 12 is removed after the joint 10 is assembled to the pipe 20, the ferrule 13 is not removed together, and the biting state of the ferrule 13 can be confirmed.

  Each of the embodiments of the present invention described above is an example for explaining the present invention, and is not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in various other modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Joint main body, 11a ... Inner peripheral surface, 11b ... Tapered inner peripheral surface, 12 ... Nut, 12a ... Inner peripheral surface, 12b ... Tapered inner peripheral surface, 12B ... Joint part, 12C ... Protruding part, 12D ... Pressing part, 12E ... Pressing part, 12f ... Abutted surface, 13 ... Ferrule, 13a '... Front end, 13a ... Front end part, 13b ... Rear end part, 13c ... Rising part, 13c' ... Member, 13c1 ... Cylinder Part, 13c2 ... cylindrical part, 13d ... pressed part, 13d '... member, 13e' ... connection point, 13e ... intermediate part, 13f ... fitting part, 13g ... elastic body, 13h ... fulcrum, 13i '... action point, 15 ... Allowable space, 15a ... Allowable space, 15b ... Allowable space, 20 ... Pipe, 20a ... Outer peripheral surface

Claims (6)

A joint connecting to a pipe,
A first member having a through hole for receiving the tube;
A second member that has a through-hole that receives the tube, and that is screw-coupled to the first member so that the central axis of the through-hole coincides with the central axis of the through-hole of the first member;
It has a through-hole which leads from the 1st end which receives the pipe to the 2nd end, and an inner diameter is between the 1st end and the 2nd end rather than the 1st end and the 2nd end. There is a large portion, and the central axis of the through hole is aligned with the central axis of the first member and the second member, and the inner peripheral surface of the first member, the inner peripheral surface of the second member, and the pipe And a ferrule disposed in a storage space formed by the outer peripheral surface,
The ferrule includes a rising portion including a first cylindrical portion having the first end portion and an inner diameter and an outer diameter that are the same as the first end portion and extending in the axial direction, and closer to the second end portion than the rising portion. There is a pressed portion, and an intermediate portion including a portion having an inner diameter larger than that of the first end portion and the second end portion, and connecting the rising portion and the pressed portion . A tapered second cylindrical portion whose inner diameter and outer diameter increase toward the second end portion is connected to the two end portions, and the inner diameter and the second cylindrical portion of the second cylindrical portion are connected to the second end portion side. A third cylindrical portion having a uniform outer diameter and extending in the axial direction is connected;
The first member has a first tapered inner peripheral surface that is a tapered inner peripheral surface that contacts the first end of the ferrule,
The second member has a pressing portion that presses at least a part of the pressed portion of the ferrule,
In the storage space, there is a permissible space in which the rising portion can be raised so that the ferrule is stored and the angle formed between the first cylindrical portion and the outer peripheral surface of the pipe is increased.
When the screw connection between the first member and the second member is tightened , the third cylindrical portion of the ferrule is deformed so that the inner diameter and outer diameter of the first end side are larger than the second end side. The rising portion rises, rotates with the outer periphery of the first end as a fulcrum and the inner periphery of the first end acts as an action point, and is driven into the outer periphery of the tube.
Fittings. The ferrule has a fitting portion including the second end,
The second member has a fitted portion that fits with the fitting portion of the ferrule,
The ferrule and the second member are integrated by press-fitting and fitting the fitting portion of the ferrule to the fitted portion of the second member.
The joint according to claim 1. The fitting portion has an inner diameter that increases toward the second end,
When tightening the screw connection of the first member and the second member, wherein the fitted portion is pressed toward the second end portion of the fitting portion to the pipe, according to claim 2 fittings . The fitted portion of the second member, wherein at notch including a tapered portion whose inner diameter is reduced as by threaded coupling tightened toward the traveling direction of the rear of the second member, according to claim 3 Fittings. Wherein when the first member tightening the screw connection of the second member, the second end is closer to the first end portion moves along the surface of the pipe, coupling according to claim 1. A first member having a through-hole for receiving a tube; and a through-hole for receiving the tube, wherein the central axis of the through-hole is aligned with the central axis of the through-hole of the first member and screwed to the first member And a second member that is used in a joint that connects to the tube, and has a through hole that passes from the first end that receives the tube to the second end, and the central axis of the through hole is the first axis. A ferrule disposed in a storage space formed by the inner peripheral surface of the first member, the inner peripheral surface of the second member, and the outer peripheral surface of the pipe, in alignment with the central axis of the member and the second member. There,
A rising portion including a first cylindrical portion having the first end portion and an inner diameter and an outer diameter that are the same as the first end portion and extend in the axial direction;
A pressed portion on the second end side of the rising portion;
An intermediate portion between the first end portion and the second end portion, including a portion having a larger inner diameter than the first end portion and the second end portion, and connecting the rising portion and the pressed portion; Have
A tapered second cylindrical portion whose inner diameter and outer diameter increase toward the second end portion is connected to the second end portion side of the first cylindrical portion, and the second cylindrical portion is connected to the second cylindrical portion. A third cylindrical portion having a uniform inner diameter and outer diameter and extending in the axial direction is connected to the end side,
The first member has a first tapered inner peripheral surface that is a tapered inner peripheral surface that contacts the first end of the ferrule,
The second member has a pressing portion that presses at least a part of the pressed portion of the ferrule,
In the storage space, there is a permissible space in which the rising portion can be raised so that the ferrule is stored and the angle formed between the first cylindrical portion and the outer peripheral surface of the pipe is increased.
When the screw connection between the first member and the second member is tightened , the third cylindrical portion is deformed so that the inner diameter and the outer diameter of the first end portion side are larger than the second end portion side, The rising portion rises, rotates with the outer periphery of the first end as a fulcrum and the inner periphery of the first end acts as an action point, and is driven into the outer periphery of the tube.
Ferrule.

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