JP6243246B2 - 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.

  Various single ferrule-type joints have been proposed in connection with fluid pipes in order to reduce costs by reducing the number of parts and to facilitate installation work (see Patent Documents 1 to 3). In the single ferrule type joint, the ferrule is a single joint and includes a joint body, a nut, and a ferrule. The ferrule pushed by the nut by tightening the screw connection causes the tip to bite into the pipe along the tapered surface of the joint body, thereby realizing a seal mechanism. By using one ferrule between the joint body and the nut, the number of parts can be reduced, and the installation work can be simplified.

JP 2010-509548 A (FIGS. 1A to 1D, 4A, 4B, 6A to 6C, 7, 8, 9 etc.) Japanese translation of PCT publication No. 2007-502940 (FIGS. 7, 7A, 8, 13, 13A, 14 etc.) JP-T 2009-522525 Publication (FIGS. 13 and 14)

  However, the ferrule needs to be attached in a predetermined direction at the time of construction. However, since it is a small part, it may cause a difference in direction. Moreover, there are many cases where the ferrule is dropped and lost during construction, and it is necessary to purchase a large number of ferrules in advance.

  An object of the present invention is to provide a technique for preventing a difference in the direction of attaching a ferrule during construction and preventing the ferrule from being lost.

  A joint according to one embodiment of the present invention is a joint that is connected to a pipe, and includes a first member having a through hole that receives the pipe, a through hole that receives the pipe, and a central axis of the through hole. A second member threadedly coupled to the first member in alignment with the central axis of the through hole of the first member, a through hole penetrating from the first end to the second end and receiving the tube is formed; The inner axis of the first member, the inner surface of the second member, and the outer surface of the pipe are formed such that the center axis of the through hole coincides with the center axis of the first member and the second member. A ferrule disposed in the storage space, wherein the ferrule has a fitting portion including the second end portion, and the second member is fitted to the fitting portion of the ferrule. A fitting portion, and the fitting portion of the ferrule is against the fitting portion of the second member. By fitting the inlet, said ferrule and said second member are integrated.

  The ferrule according to one embodiment of the present invention has a first member having a through hole for receiving a pipe, and a through hole for receiving the pipe, and the central axis of the through hole is the central axis of the through hole of the first member. A ferrule having a second member threadedly coupled to the first member and used in a joint connected to the pipe, and having a through-hole penetrating from the first end to the second end A fitting portion including the second end portion, and the fitting portion is press-fitted and fitted into a fitting portion provided in the second member; It is configured to be integrated.

  ADVANTAGE OF THE INVENTION According to this invention, the direction difference of the attachment of a ferrule can be prevented at the time of construction, and it can prevent losing and dropping a ferrule.

It is sectional drawing of the coupling by this embodiment. It is sectional drawing which shows the state of the joint after attaching a joint to a pipe | tube. 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 the graph which measured the change to the relative position of the front end part of a ferrule with respect to a pipe | tube when the front end part of a ferrule digs and drives toward the outer periphery of a pipe | tube. It is a figure for demonstrating the modification of the coupling by this embodiment. It is a figure for demonstrating the coupling by another modification. It is a figure for demonstrating the coupling by another modification.

  An example of an embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view of the joint according to the present 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 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. 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 is an area where the inner diameter and the outer diameter gradually increase toward the rear. 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 be inclined 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 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 tapered inner peripheral surface 11b and the outer peripheral surface of the rising portion 13c of the ferrule 13 form a body angle β on a plane passing through the central axis. 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 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. The notch 12e is formed continuously around the inner peripheral surface of the protruding portion 12C. By fitting the fitting part 13f of the ferrule 13 into the groove notch 12e, the nut 12 and the ferrule 13 are integrated. 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 abuts on a contacted surface 12f that constitutes a part of the notch 12e. The fitting 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 against 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. The angles α and β are set to appropriate values 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. You only have to set it.

  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 be raised to increase (to reduce the angle β). 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 11 is not deformed. .

  In the present embodiment, as an example, the allowable space 15 includes a first allowable space 15a that can be raised so as to increase an angle between the rising portion 13c and the outer peripheral surface of the tube 20, and a rising portion 13c. An example is shown in which there are two spaces of a second allowable space 15b for increasing the outer diameter of the intermediate portion 13e in order to start up. 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 13c stands up. When the rising portion 13c of the ferrule 13 rises, the outer periphery of the front end portion 13a abuts against the tapered inner peripheral surface 11a of the joint main body 11, and the progress is limited. The force that is driven so that the peripheral portion bites into the pipe 20 is efficiently generated, and the joint 10 is connected to the pipe 20 in a state where a sealing property is obtained.

  Hereinafter, the operation and action of each part when the joint 10 is assembled to the pipe 20 will be further described. FIG. 3 is a diagram for explaining the operation and action of each part when the joint is assembled to the pipe.

  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. The ferrule 13 whose pressed portion 13d is 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 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 rising portion 13 c rises so as to increase the angle formed with the outer periphery of the pipe 20 until the angle of the outer peripheral surface thereof matches the angle of the tapered inner peripheral surface 11 b of the joint body 11.

  As the rising portion 13c rises, at the front end portion 13a, the outer peripheral portion that contacts the tapered inner peripheral surface 11a of the joint body 11 is limited by the tapered inner peripheral surface 11a, and the inner peripheral portion that contacts the pipe 20 bites into the pipe. To be driven. 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 fitting portion 13 f moves on the outer peripheral surface 20 a of the tube 20 without biting into the tube 20. Further, as the inner diameter and outer diameter of the intermediate portion 13e increase, the pressed portion 13d rises, and the intermediate portion 13e and the pressed portion 13d are plastically deformed by being pressed by the pressing portion 12D. Is brought into contact with the outer peripheral surface 20a of the tube 20 (FIG. 2). 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.

  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, it is possible to suppress the joint 10 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.

  FIG. 6 is a graph obtained by measuring a change in the relative position of the front end portion of the ferrule with respect to the tube when the front end portion of the ferrule is driven into the outer periphery of the tube. In FIG. 6, a plurality of graphs indicated by solid lines change the parameter of the change in the position of the front end 13 a when the front end 13 a of the ferrule 13 is driven into the outer periphery of the tube 20. Multiple measurements. A broken line in FIG. 6 is a comparative example showing a change in the position of the front end of the front ferrule located on the joint body side in the double ferrule-type joint.

  In FIG. 6, the horizontal axis indicates the relative position in the axial direction, and the vertical axis indicates the relative displacement in the depth direction. The relative position in the finger tight state is the origin on the horizontal and vertical axes. In the axial direction, the negative value increases as it moves forward. On the vertical axis, the negative value increases as the bite progresses.

  As can be seen from FIG. 6, when the tightening of the screw connection is advanced from the finger tight state with a predetermined torque, the first stage is that the front end portion 13 a of the ferrule 13 is mainly in the axial direction with respect to the tube 20. proceed. However, when it reaches a certain point, the inner periphery of the front end portion 13a of the ferrule 13 bites into the outer periphery of the tube 20, and the front end portion 13a mainly advances in the biting direction according to the lever principle that occurs when the rising portion 13c rises. Migrate to This transition point is the grip point in the figure. At the stage where the front end portion 13a mainly advances in the biting direction, the front end portion 13a is retracted in reverse when viewed in the axial direction. When the rising of the rising portion 13c is completed, the front end portion 13a again shifts to a stage where it mainly advances forward. Thus, when the rising portion 13c rises, the lever principle works with the outer periphery of the front end portion 13a as a fulcrum and the inner periphery of the front end portion 13a as an action point, and at least a part of the screw connection is tightened. In the stage, a phenomenon occurs in which the inner periphery of the front end portion 13a bites toward the outer periphery of the tube 20 while returning to the direction opposite to the axial direction of the force of the nut 12 pushing the ferrule 13 in the axial direction.

  In this way, the front end portion 13a of the ferrule 13 is bitten and driven, so that the ferrule 13 bites into the tube 20 with a strong force, and the sealing performance is exhibited. Further, when the front end portion 13a of the ferrule 13 is bitten and driven while returning to the reverse direction, the space between the ferrule 13 and the pipe 20 is well sealed, and high sealing performance is exhibited. As can be seen from FIG. 6, the front end portion 13a of the ferrule 13 is a pipe having a single ferrule type joint (this embodiment) indicated by a solid line and a depth similar to that of a double ferrule type joint indicated by a broken line. Biting into 20.

  As described above, in the present embodiment, the fitting portion 13f of the ferrule 13 is press-fitted and fitted into the protruding portion (fitted portion) 12C of the nut 12, so that the ferrule 13 and the nut 12 are integrated. It has become. Therefore, since the ferrule 13 can be previously attached to the nut 12 in a predetermined direction and integrated with each other, it is possible to prevent a difference in direction of the parts. Further, it is possible to prevent the ferrule 13 from being dropped and lost at the time of construction, and the cost for the parts can be reduced.

  The fitting portion 13f extends so as to be inclined 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. , And is configured to protrude from the inner peripheral surface of the coupling portion 12B. Therefore, the ferrule 13 and the nut 12 can be integrated with a simple configuration.

  Further, the fitting portion 13f of the ferrule 13 is fitted to the protruding portion 12C of the nut 12 in an elastically deformed state. Therefore, the ferrule 13 and the nut 12 can be integrated only by pushing in the ferrule 13.

  Moreover, since the outer periphery of the rear end of the fitting portion 13f of the ferrule 13 is chamfered, when the joint body 11 and the nut 12 are screwed together, the outer periphery of the fitting portion 13f may slide on the notch 12e. It is possible to smoothly move the relative movement between the fitting portion 13f and the nut 12.

  Further, when the joint body 11 and the nut 12 are screwed together, as the inner diameter and outer diameter of the intermediate portion 13e increase, the pressed portion 13d rises and is plastically deformed by being pressed by the pressing portion 12D. The inner peripheral surface of the fitting portion 13 f comes into contact with the outer peripheral surface 20 a of the tube 20. Thereby, the fitting state of the fitting part 13f and the notch 12 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.

  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.

  Further, when the screw connection between the joint body 11 and the nut 12 is tightened, the fitting portion 13f of the ferrule 13 moves along the outer peripheral surface 20a of the tube 20 and approaches the front end portion 13a. 13f does not bite into the tube 20. 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.

  The above-described embodiments of the present invention are examples for explaining the present invention, and are 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.

  FIG. 7 is a view for explaining a modified example of the ferrule of the joint according to the present embodiment.

  As shown in FIG. 7, the fitting portion 113f of the ferrule 113 of the joint 110 according to the modification is configured such that only the outer diameter gradually increases toward the rear end portion 113b. Even with such a configuration, the ferrule 113 and the nut 12 can be integrated, so that it is possible to prevent erroneous insertion of components and wrong direction, and it is possible to prevent the ferrule 113 from being dropped during construction. .

  Thus, in the ferrule 13 of this embodiment, the thickness of the front end part 13a, the rear end part 13b, the rising part 13c, the pressed part 13d, and the intermediate part 13e is not particularly limited. Further, the lengths of the rising portion 13c, the intermediate portion 13e, and the pressed portion 13d are not particularly limited.

  However, the thickness of the front end portion 13a of the ferrule 13 is preferably smaller than the length of the rising portion 13c. If the length of the rising portion 13c in the ferrule 13 is larger than the thickness of the front end portion 13a, the rising portion 13c rises, and at the front end portion 13a, the outer periphery abuts against the tapered inner peripheral surface 11b. When the inner peripheral portion that is restricted and is in contact with the pipe 20 is driven so as to bite into the pipe 20, the inner circumference is the pipe 20 based on the lever principle, with the outer circumference of the front end portion 13a as a fulcrum and the inner circumference as a working point. It is because it is driven in with a strong force toward.

  On the other hand, the thickness of the front end portion 13a of the ferrule 13 may be larger than the length of the rising portion 13c. In that case, the front end portion 13a of the ferrule 13 can be driven to bite by a larger bite amount by merely slightly increasing the outer diameter of the intermediate portion 13e.

  FIG. 8 is a view for explaining a joint according to another modification.

  Referring to FIG. 8, the ferrule 213 of the joint 210 according to this modification is a part corresponding to the ferrule 13 in FIG. 1, and is basically the same as the ferrule 13 except for the portions described below.

  The ferrule 213 of the present modification has a radially non-uniformly shaped portion (non-uniformly shaped portion 213g) at a specific position in the axial direction in the intermediate portion 213e. In the example of FIG. 8, the non-uniformly shaped portion 213g included in the intermediate portion 213e is thinner than the other portions of the intermediate portion 213e.

  The non-uniformly shaped portion 213g is realized by a groove continuously dug around the inner peripheral surface at a specific position in the axial direction of the ferrule 213. Since the ferrule 213 of this modification has a non-uniformly shaped portion 213g, it is easier to deform so as to increase the inner diameter and outer diameter of the intermediate portion 213e than the ferrule 213 shown in FIG. Therefore, the tightening torque for causing the front end portion 213a to rotate can be kept small.

  Also in this modified example, the fitting portion 213f of the ferrule 213 is fitted to the protruding portion 12C of the nut 12, and the nut 12 and the ferrule 213 are integrated.

  FIG. 9 is a view for explaining a joint according to still another modification.

  Referring to FIG. 9, the ferrule 313 of the joint 310 of the present modification is a part corresponding to the ferrule 13 in FIG. 1, and is basically the same as the ferrule 13 except for the portions described below.

  The ferrule 313 of this modification also has a non-uniformly shaped portion 81b at a specific position in the axial direction in the intermediate portion 313e. In the example of FIG. 9, as the non-uniformly shaped portion 313g, there are a portion where the inner diameter of the inner peripheral surface is different from other portions and a portion where the outer diameter of the outer peripheral surface is different from other portions. Specifically, when viewed in a cross section passing through the central axis, the inner peripheral surface has a recessed portion and the outer peripheral surface has a protruding portion. These are non-uniformly shaped portions 313g formed by punching from the inner peripheral surface of the ferrule 313 to a specific position in the axial direction.

  Since the ferrule 313 of the present modification has a non-uniformly shaped portion 313g, it is easier to deform so as to increase the inner and outer diameters of the intermediate portion 313e than the ferrule 313 shown in FIG. Therefore, the tightening torque for causing the front end portion 313a to rotate can be suppressed to a small value.

  Also in this modification, the fitting portion 313f of the ferrule 313 is fitted to the protruding portion 12C of the nut 12, and the nut 12 and the ferrule 313 are integrated.

  In the above-described embodiment, the rising surface 13c of the ferrule 13 has an angle β on the ceiling surface of the storage space formed by the inner peripheral surface of the joint body 11, the inner peripheral surface of the nut 12, and the outer peripheral surface of the pipe 20. It may be in contact with the intermediate portion 13e having an increased outer diameter in a state where it has risen only. This can be realized by designing in advance so that the distance between the top portion of the intermediate portion 13e of the ferrule 13 and the ceiling surface of the storage space is a predetermined distance in the finger tight state. According to this, when the rising portion 13c rises by an appropriate angle β and a good seal between the ferrule 13 and the tube 20 is obtained, the top of the ferrule 13 abuts against the ceiling surface of the storage space, and the ferrule 13 is reinforced. As a result, good sealing performance can be maintained. Note that the ceiling surface of the storage space may be constituted by either the joint body 11 or the nut 12. In the present invention, it is not essential that the top of the ferrule 13 abuts on the ceiling surface of the storage space, and the top of the ferrule 13 does not have to abut on the ceiling surface of the storage space.

  In the present embodiment, the outer periphery of the front end portion 13 a of the ferrule 13 is rounded, so that when the rising portion 13 c rises, the outer periphery of the front end portion 13 a pressed against the joint body 11 is It slides on the taper inner peripheral surface 11a, and it is difficult to shift on the inner peripheral pipe 20 of the front end portion 13a, and can be driven in favorably.

  In the embodiment of FIG. 1, the pressing portion 12 </ b> D has an example in which an acute angle is formed with the outer peripheral surface of the tube 20 in a cross section passing through the central axis, but the present invention is not limited thereto. As another example, the pressing portion 12 </ b> D may be perpendicular to the outer peripheral surface of the tube 20. If the pressing portion 12a of the nut 12 is vertical, a force is efficiently applied to the pressed portion 13d of the ferrule 13 in the axial direction, and a force that increases the inner diameter and outer diameter of the intermediate portion 13e of the ferrule 13 derived therefrom is also generated. It becomes easy. As a result, rotational movement at the front end 13a of the ferrule 13 is likely to occur.

Further, in the embodiment of FIG. 1, the nut 12 pushes the pressed portion 13d of the ferrule 13 in the axial direction, the joint body 11 and the front end portion 13a of the ferrule 13 abut, and the rising portion 13c of the ferrule 13 is the joint. Although the example which stands | starts up toward the taper inner peripheral surface 11b of the main body 11 was shown, this invention is not limited to this example. As another example, the rising portion 13c and the pressed portion 13d of the ferrule 13 may be disposed in reverse. In that case, the nut 12 has a tapered inner peripheral surface that is in contact with the front end portion 13 of the ferrule 13 and is similar to the tapered inner peripheral surface 11b of the joint body 11 in FIG. When the nut 12 pushes the rising portion 13c in the axial direction by the taper inner peripheral surface, the joint body 11 in contact with the pressed portion 13d of the ferrule 13 relatively pushes back the pressed portion 13d. As a result, the ferrule 13 is deformed, and a rotational motion occurs in the front end portion 13a that is in contact with the nut 12. The outer periphery of the front end portion 13a serves as a fulcrum, and the inner periphery serves as an action point. Is driven into the outer periphery of the tube 20. In this case, the fitting body 11 is provided with a fitted portion, the fitting portion 13f of the ferrule 13 is fitted into the fitted portion, and the fitting body 11 and the ferrule 13 are integrated.

Claims (8)

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;
A through hole penetrating from the first end portion to the second end portion to receive the tube is formed, and the first member is formed by aligning the central axis of the through hole with the central axis of the first member and the second member. Is 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, and the second end is tightened by screwing the first member and the second member includes a ferrule to be pressed first end Ru was bite into the tube from the part side, a
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,
A joint in which the ferrule and the second member are integrated in advance before construction by the fitting portion of the ferrule being press-fitted and fitted into the fitted portion of the second member. The fitting portion of the ferrule extends so as to be inclined with respect to the central axis of the through hole,
The inner diameter and the outer diameter are configured to increase toward the second end,
The second member includes a coupling portion that is screw-coupled to the first member, and the fitted portion.
The fitted portion is configured to protrude inward from the inner peripheral surface of the coupling portion,
The said ferrule and the said 2nd member are integrated by press-fitting the said fitting part of the said ferrule with respect to the said to-be-fitted part, and contact | abuts to the to-be-contacted surface of the said to-be-fitted part. The joint according to 1.   The joint according to claim 2, wherein the fitting portion is configured to be elastically deformable in a radial direction and is fitted to the fitted portion in a state of being elastically deformed.   4. The joint according to claim 2, wherein a portion of the fitting portion that comes into contact with the inner circumferential surface of the fitted portion is rounded at the outer periphery. The ferrule includes a rising portion including the first end portion, a pressed portion connected to the fitting portion, and a portion having a larger inner diameter than the first end portion and the second end portion. And an intermediate part connecting the pressed part,
The second member has a pressing portion that presses at least a part of the pressed portion of the ferrule,
After the finger tight state, when the screw connection between the first member and the second member is tightened, the pressed portion is pressed by the pressing portion, and a first force is applied in the axial direction from the second member. The ferrule is derived from the first force and acts so as to spread the intermediate portion outward, so that the pressed portion and the first end portion approach each other, and the ferrule The rising portion rises, the inner periphery of the first end portion is driven into the outer periphery of the tube, and the intermediate portion and the pressed portion are plastically deformed, whereby the fitting portion and the fitted portion The joint according to any one of claims 2 to 4, wherein the fitting state is eliminated.   When the screw connection between the first member and the second member is tightened, the rising portion of the ferrule rises and rotates with the outer periphery of the first end as a fulcrum and the inner periphery of the first end as a working point The joint according to claim 5, wherein the joint is driven toward the outer periphery of the pipe.   The joint according to claim 6, wherein when the screw connection between the first member and the second member is tightened, the fitting portion moves along the surface of the tube and approaches the first end portion. 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 screw-coupled A through hole penetrating from the first end portion to the second end portion is formed, and a central axis of the through hole is defined as the first member and the second member. The first member is disposed in a storage space formed by an inner peripheral surface of the first member, an inner peripheral surface of the second member, and an outer peripheral surface of the pipe, so as to coincide with the central axis of the second member. A ferrule that is pressed from the second end side by tightening the screw connection of the second member, and causes the first end to bite into the pipe ,
A fitting portion including the second end;
A ferrule configured to be integrated with the second member in advance before construction by press-fitting and fitting the fitting portion into a fitted portion provided in the second member.

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