JP6378545B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint.

  Patent document 1 discloses a pipe joint. This pipe joint includes a joint body, a tightening nut, and a cylindrical ferrule. The joint body has a receiving portion. One end of the connecting pipe is inserted into the receiving part. A male screw is provided on the outer periphery of the receiving portion of the joint body. The clamping nut is screwed into the male thread. The ferrule is disposed inside the receiving portion of the joint body. The ferrule fits around the outer periphery of the connecting pipe. A tapered surface is formed on the inner periphery of the receiving portion. This tapered surface extends outward in the axial direction. This tapered surface adds a diameter reducing action to the tip of the ferrule. A female screw and a ferrule pressing step are formed on the inner periphery of the tightening nut. The female screw is screwed with the male screw described above. The ferrule pressing step is provided on the axially outer end side of the female screw. As the tightening nut is screwed in, the ferrule pressing step pushes the rear end of the ferrule inward in the axial direction. Thereby, the tip of the ferrule bites into the gap between the tapered surface on the inner periphery of the receiving portion and the outer periphery of the connecting pipe. As a result, the tip of the ferrule adheres tightly to the outer periphery of the connecting pipe and the tapered surface. The rear end portion of the ferrule is formed in a circular cross section. A part of the circumference of the rear end portion comes into linear contact with the ferrule pressing step. The other part of the circumference hits the outer periphery of the connecting pipe. According to the pipe joint disclosed in Patent Document 1, it is possible to ensure sealing performance and prevent co-rotation.

JP 2006-207795 A

  However, the pipe joint disclosed in Patent Document 1 has a problem that the fastening nut must be deeply screwed in order to fix the connecting pipe to the joint body, and a problem that the tightening torque of the fastening nut is high. There is. The more the tightening nut has to be screwed in deeper, the greater the amount of work for fixing the connecting pipe to the joint body. The higher the tightening torque of the tightening nut, the greater the force required to fix the connecting pipe to the joint body.

  The present invention solves this problem. An object of the present invention is to provide a pipe joint that can reduce the amount of work for fixing the connecting pipe to the joint body and reduce the force required to fix the connecting pipe to the joint body.

  The pipe joint of the present invention will be described with reference to the drawings. The reason why the symbols in the figure are used in this column is to help understand the content of the invention. The use of the symbols in the figure in this column is not intended to limit the scope of the invention to the scope shown.

  In order to achieve the above-described object, according to one aspect of the present invention, the pipe joint includes hollow joint bodies 10 and 210, a lock ring 14, and lock ring housings 12 and 212. The joint bodies 10 and 210 have a connecting pipe entrance 50. The connection pipe entrance 50 is an entrance at one end of the connection pipe 150. The lock ring 14 prevents one end of the connection pipe 150 from coming off the joint bodies 10 and 210. The lock ring 14 is accommodated in the lock ring accommodating bodies 12, 212. At least the portion of the joint bodies 10 and 210 where the connection pipe entrance 50 is provided enters the inner periphery of the lock ring housings 12 and 212. The connecting pipe 150 passes through the lock ring housings 12 and 212. The lock ring containers 12 and 212 include a connecting pipe passage port 90, a tapered surface 72, a joint main body entrance 98, and a moving part 96. One end of the connection pipe 150 passes through the connection pipe passage port 90. The tapered surface 72 is disposed on the inner periphery of the lock ring housing 12, 212. The taper surface 72 has an inner diameter that increases as the distance from the connection pipe passage port 90 increases. The joint main body entrance 98 is an entrance of the joint body 10, 210 where the connection pipe entrance 50 is provided. The joint main body entrance 98 faces the connection pipe passage opening 90 with the tapered surface 72 interposed therebetween. The moving part 96 moves the portion of the joint bodies 10 and 210 that have entered from the joint body entrance 98 to the tapered surface 72 viewed from the joint body entrance 98. The lock ring housings 12, 212 further have a lock ring insertion groove 74. The lock ring insertion groove 74 is disposed between the tapered surface 72 and the joint main body entrance 98 on the inner periphery of the lock ring housings 12 and 212. The lock ring 14 has an outer peripheral portion 100 and a main body facing surface 102. The outer peripheral portion 100 is fitted in the lock ring insertion groove 74. The main body facing surface 102 protrudes from the lock ring fitting groove 74 and faces the joint main bodies 10 and 210. The joint main bodies 10 and 210 have an annular lock ring pressing surface 52 in addition to the connection pipe entrance 50. The lock ring pressing surface 52 is arranged around the connection pipe entrance 50. The lock ring pressing surface 52 faces the main body facing surface 102 of the lock ring 14 in the lock ring housings 12 and 212. The outer diameter of the lock ring pressing surface 52 is larger than the inner diameter of the lock ring 14.

  When the moving portion 96 of the lock ring container 12, 212 moves the portion of the joint body 10, 210 that has entered from the joint body entrance 98 toward the tapered surface 72 viewed from the joint body entrance 98, the joint body 10 , 210 approaches the main body facing surface 102 of the lock ring 14 in the lock ring housings 12 and 212 and pushes it. The lock ring 14 pressed by the lock ring pressing surface 52 comes out of the lock ring insertion groove 74. When the lock ring 14 exits the lock ring insertion groove 74, the lock ring 14 is squeezed. The lock ring 14 is narrowed by the tapered surface 72 as it is further pushed in the direction of the connecting pipe passage opening 90. Thereby, compared with the case where the lock ring accommodating bodies 12 and 212 do not have the lock ring fitting groove 74, the lock ring accommodating bodies 12 and 212 necessary for fixing the connecting pipe 150 to the joint main bodies 10 and 210 are obtained. The amount of movement is reduced. As a result, the amount of work for fixing the connecting pipe 150 to the joint bodies 10 and 210 can be reduced. The constricted lock ring 14 bites into the outer peripheral surface of one end portion of the connection pipe 150 that has been previously inserted into the joint main bodies 10 and 210. The force required for this biting is compared with the force required to be applied to the lock ring housings 12 and 212 because the lock ring 14 is pushed into the gap between the inner periphery of the joint body 10 and 210 and the outer periphery of the connection pipe 150. Low. As a result, the force required to fix the connecting pipe 150 to the joint bodies 10 and 210 can be reduced.

Further, the lock ring Hamakomimizo 74 described above, the bottom surface 80, a tapered side surface 82, that has a joint body entrance side surface 84. The bottom surface 80 faces the internal space of the lock ring container 12, 212. The tapered side surface 82 is disposed on the tapered surface 72 side when viewed from the bottom surface 80. The tapered side surface 82 forms a ridge 88 with the inner periphery of the lock ring housing 12, 212. The joint body entrance side surface 84 is disposed on the joint body entrance 98 side when viewed from the bottom surface 80. In this case, the outer peripheral portion 100 of the lock ring 14, the tapered side curved surface 110, that has a joint body entrance side curved surface 112. The taper side curved surface 110 is arranged along the ridge 88 of the lock ring insertion groove 74. When the lock ring 14 is pushed by the lock ring pressing surface 52, the tapered curved surface 110 comes into contact with the ridge 88 of the lock ring fitting groove 74 and gets over the ridge 88. The shape of the cross section orthogonal to the longitudinal direction of the outer peripheral part 100 among the cross sections of the taper side curved surface 110 is an arc shape. The joint main body entrance-side curved surface 112 is integrally continuous with the main body facing surface 102. The joint main body entrance side curved surface 112 is arranged along the joint main body entrance side surface 84 of the lock ring fitting groove 74. Of the cross section of the joint main body entrance-side curved surface 112, the shape of the cross section orthogonal to the longitudinal direction of the outer peripheral portion 100 is an arc shape.

  The taper side curved surface 110 of the lock ring 14 is disposed along the ridge 88 of the lock ring fitting groove 74. The lock ring 14 pushed by the lock ring pressing surface 52 contacts and climbs over the ridge 88. As a result, the lock ring 14 is narrowed. Since the ridge 88 gets over and narrows, if the movement amount of the lock ring housings 12 and 212 is the same, a curved surface or a tapered surface is formed between the tapered side surface 82 and the inner periphery of the lock ring housings 12 and 212. Compared to the case where the lock ring 14 is made, the lock ring 14 is narrowed. Further, the joint main body entrance side curved surface 112 is arranged along the joint body entrance side surface 84. The joint main body entrance-side curved surface 112 is integrally continuous with the main body facing surface 102. The shape of the cross section orthogonal to the longitudinal direction of the outer peripheral portion 100 of the joint main body entrance-side curved surface 112 is an arc shape. Thereby, when the lock ring 14 is narrowed, the joint main body entrance-side curved surface 112 is not integral with the main body facing surface 102, and the outer peripheral portion 100 of the lock ring 14 has a flat surface instead of the joint main body entrance-side curved surface 112. The lock ring 14 slides smoothly on the lock ring pressing surface 52 as compared with the case where the lock ring 14 is provided. When the lock ring 14 smoothly slides on the lock ring pressing surface 52, the possibility that the force required for the movement rapidly increases during the movement of the lock ring housings 12 and 212 is reduced as compared with the case where the lock ring 14 does not slide smoothly. Further, when the tapered side surface 82 forms a ridge 88 between the inner periphery of the lock ring housings 12 and 212, a curved surface or a tapered surface is formed between the tapered side surface 82 and the inner periphery of the lock ring housings 12 and 212. The possibility that the lock ring 14 moves accidentally in the direction of the tapered surface 72 is lower than that in the case where is formed. When the possibility decreases, the lock ring 14 that has already been constricted by the tapered surface 72 is connected when one end of the connection pipe 150 is inserted into the joint bodies 10 and 210 as compared with the case where the possibility does not decrease. The possibility of hindering the insertion of the tube 150 is reduced.

  Alternatively, it is desirable that the tapered side surface 82 described above forms the tapered surface 72 and the ridge 88 in the inner periphery of the lock ring housings 12 and 212.

  When the tapered side surface 82 forms the tapered surface 72 and the ridge 88, the lock ring fitting groove 74 and the tapered surface 72 are adjacent to each other with the ridge 88 interposed therebetween. Thereby, compared with the case where the lock ring insertion groove 74 and the taper surface 72 are separated, the amount of movement of the lock ring housings 12 and 212 required for fixing the connecting pipe 150 to the joint main bodies 10 and 210 is small. Become.

Further, joint hand body entrance side surface 84 described above is preferably higher than the taper side surface 82 when viewed from the bottom surface 80.

  When the lock ring 14 is fitted into the gap between the joint main body 10, 210 and the lock ring housing 12, 212, the lock ring 14 loses its function of preventing the connection pipe 150 from coming off. When the joint main body entrance side surface 84 is higher than the taper side surface 82 when viewed from the bottom surface 80, the joint body entrance side surface 84 is the same height as the taper side surface 82 when viewed from the bottom surface 80, and the joint body entrance Compared to the case where the mouth side surface 84 is lower than the taper side surface 82 when viewed from the bottom surface 80, the lock ring 14 is less likely to get over the edge of the joint main body entrance side surface 84. Since the lock ring 14 is difficult to get over the edge of the joint main body entrance side surface 84, the lock ring 14 is difficult to fit into the gap between the joint main body 10, 210 and the lock ring housing 12, 212. As a result, the retaining action of the lock ring 14 is not easily lost.

  Further, it is desirable that the lock ring housings 12 and 212 described above have a cylindrical inner member 60 and a cylindrical outer shell 62. A tapered surface 72 and a lock ring fitting groove 74 are disposed on the inner periphery of the inner member 60. The outer shell 62 is a separate body from the inner member 60. The outer shell 62 accommodates the inner member 60. In the outer shell 62, a connecting pipe passage port 90, a moving part 96, and a joint main body entrance 98 are arranged. The outer shell 62 has an inner member pressing portion 92. The inner member pressing portion 92 is disposed around the connecting pipe passage opening 90. The inner member pressing portion 92 faces one end of the inner member 60. The moving part 96 has a screw. The screw converts the torque received by the outer shell 62 into a force in the direction of the tapered surface 72 viewed from the joint body entrance 98 and applies it to the joint bodies 10 and 210. The static friction coefficient between the inner member 60 and the outer shell 62 is smaller than the static friction coefficient between the lock ring pressing surface 52 and the lock ring 14.

  The separate body referred to in the present invention means that the former object is in a state capable of relative movement when viewed from any point on the latter object because there is no fixed part to the other object. The inner member 60 is a separate body from the outer shell 62. Since it is a separate body, the inner member 60 is in a state in which relative movement is possible when viewed from any point on the outer shell 62. When the outer shell 62 of the lock ring accommodating body 12, 212 receives torque, the screw of the moving part 96 converts the torque into a force in the direction of the tapered surface 72 viewed from the joint main body entrance 98, and Add. The lock ring pressing surface 52 of the joint body 10, 210 to which a force is applied to the screw of the moving part 96 advances in the direction of the connecting pipe passage port 90 in the lock ring housings 12, 212. The lock ring pressing surface 52 presses the main body facing surface 102 of the lock ring 14. The inner member pressing portion 92 presses one end of the inner member 60. At this time, since the static friction coefficient between the inner member 60 and the outer shell 62 is smaller than the static friction coefficient between the lock ring pressing surface 52 and the lock ring 14, the inner member 60 has a fixed portion to the outer shell 62. As compared with the case where the lock ring accommodating bodies 12 and 212 are formed of a single part having the connecting pipe passage port 90, the tapered surface 72, the moving portion 96, and the joint main body entrance 98, the lock ring accommodating bodies 12 and The force that needs to be applied to 212 can be reduced.

  Alternatively, the screws included in the moving parts of the lock ring housings 12 and 212 described above may be formed in the inner periphery of the lock ring housings 12 and 212 at the back of the tapered surface 72 and the joint main body entrance as viewed from the connection pipe passage port 90. It is desirable that the female screw is disposed in front of 98. In this case, it is desirable that the joint bodies 10 and 210 have a cylindrical receiving portion 30. It is desirable that the connecting pipe entrance 50 be disposed at one end of the receiving portion 30. It is desirable that the lock ring pressing surface 52 be disposed around the connection pipe entrance 50 in the receiving portion 30. It is desirable that a male screw 32 screwed with a female screw included in the lock ring housings 12 and 212 is disposed on the outer periphery of the receiving portion 30.

  ADVANTAGE OF THE INVENTION According to this invention, the work amount for fixing a connecting pipe to a joint main body can be reduced, and a pipe joint with small force required in order to fix a connecting pipe to a joint main body can be provided.

1 is an external view of a pipe joint according to an embodiment of the present invention. It is sectional drawing of the lock ring accommodation nut concerning one embodiment of the present invention. It is sectional drawing of the opening part of the coupling main body concerning embodiment with this invention, the inner member of a lock ring accommodation nut, and a lock ring. It is sectional drawing which shows the condition where the connection pipe was inserted in the pipe joint concerning one embodiment of this invention. It is sectional drawing in the time of the lock ring of the pipe joint concerning one embodiment of this invention having started to narrow. It is sectional drawing after the lock ring of the pipe joint concerning one embodiment of this invention bites into a connection pipe. It is an external view of the pipe joint concerning other embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Description of structure]
FIG. 1 is an external view of a pipe joint according to the present embodiment. In FIG. 1, a part of the pipe joint is removed. Based on FIG. 1, the structure of the pipe joint concerning this embodiment is demonstrated. The pipe joint according to this embodiment includes a joint body 10, a pair of lock ring housing nuts 12, a pair of lock rings 14, a pair of first seals 16, and a pair of second seals 18. In FIG. 1, one of the pair of lock rings 14, one of the pair of first seals 16, and one of the pair of second seals 18 are partially removed.

  One end of the connection pipe 150 is inserted into the joint body 10. In the case of this embodiment, the joint main body 10 is cylindrical. Therefore, the joint body 10 is hollow. The lock ring housing nut 12 is connected to the joint body 10. The connecting pipe 150 described above passes through the lock ring housing nut 12 connected to the joint body 10. The lock ring 14 is housed inside the lock ring housing nut 12. The lock ring 14 prevents one end portion of the connection pipe 150 connected to the joint body 10 from coming off from the joint body 10. The first seal 16 and the second seal 18 are accommodated inside the joint body 10. The first seal 16 seals between the outer peripheral surface of the connection pipe 150 and the inner peripheral surface of the joint body 10. In the present embodiment, the first seal 16 is made of hydrogenated acrylonitrile butadiene rubber. The second seal 18 seals between the outer peripheral surface of the connection pipe 150 and the inner peripheral surface of the joint body 10. In the present embodiment, the second seal 18 is made of ethylene propylene rubber. Thus, even when the fluid flowing in the joint body 10 is at a low temperature (for example, a temperature at which the sealing function of the first seal 16 is reduced, such as 228.15 Kelvin), the second seal 18 is connected to the outer peripheral surface of the connection pipe 150. The space between the inner peripheral surface of the joint body 10 can be sealed.

  In the case of the present embodiment, the joint body 10 is made of metal. The joint body 10 includes a pair of receiving portions 30, a pair of male screws 32, a pair of first seal grooves 34, a pair of second seal grooves 36, a pair of end-side outer peripheral projections 38, and a pair of central sides. It has an outer peripheral protrusion 40 and a nut contact portion 42. As described above, in the present embodiment, the joint body 10 is cylindrical. In the case of the present embodiment, the receiving ports 30 are disposed at both ends of the joint body 10. Therefore, in the case of this embodiment, the receiving part 30 is also cylindrical. The receiving portion 30 has a connecting pipe entrance 50, an annular lock ring pressing surface 52, and a passage portion 54. The connection pipe entrance 50 is an entrance at one end of the connection pipe 150. In the case of this embodiment, the connecting pipe entrance 50 is disposed at one end of the receiving port 30. The lock ring pressing surface 52 is disposed around the connection pipe entrance 50. The outer diameter of the lock ring pressing surface 52 is larger than the inner diameter of the lock ring 14. The passage portion 54 is disposed at a position adjacent to the connection pipe entrance 50 in the inner circumference of the receiving portion 30 (immediately behind the connection pipe entrance 50 when viewed from the outside of the joint body 10). One end of the connection pipe 150 that has entered from the connection pipe entrance 50 passes through the passage portion 54. The inner diameter of the passage portion 54 is smaller than the inner diameter of the lock ring 14. The male screw 32 is disposed on the outer periphery of the receiving portion 30. As a result, in the case of this embodiment, the male screw 32 is disposed at both ends of the joint body 10. In the case of the present embodiment, the first seal groove 34 is disposed on the inner periphery of the receiving portion 30. As a result, in the case of the present embodiment, the first seal grooves 34 are arranged at two locations on the inner periphery of the joint body 10. The first seal 16 is fitted in the first seal groove 34. In the case of this embodiment, the second seal groove 36 is also disposed on the inner periphery of the receiving portion 30. As a result, in the case of this embodiment, the second seal grooves 36 are also arranged at two locations on the inner periphery of the joint body 10. The position of the second seal groove 36 is closer to the end of the joint body 10 than the first seal groove 34. The second seal 18 is fitted in the second seal groove 36. The end-side outer peripheral projection 38 is provided on the outer periphery of the joint body 10. In the case of the present embodiment, the end-side outer peripheral protrusion 38 surrounds the outer periphery of the joint body 10. The center-side outer peripheral projection 40 is disposed on the outer periphery of the joint body 10. The position of the center side outer peripheral protrusion 40 is closer to the center of the joint body 10 than the end side outer peripheral protrusion 38. In the case of this embodiment, the center side outer peripheral protrusion 40 also surrounds the outer periphery of the joint body 10. The nut contact portion 42 is disposed at a position between the outer periphery of the joint body 10 and sandwiched by the pair of the central outer peripheral protrusions 40. The side surface 55 of the nut contact portion 42 is disposed at a position that satisfies the following requirements. The requirement is a requirement that when the nut locking protrusion 99 of the lock ring receiving nut 12 gets over the central outer peripheral protrusion 40, a slight gap is provided to face the end of the lock ring receiving nut 12.

  FIG. 2 is a cross-sectional view of the lock ring housing nut 12 according to the present embodiment. Based on FIG. 1 and FIG. 2, the structure of the lock ring accommodation nut 12 concerning this embodiment is demonstrated. The lock ring housing nut 12 has an inner member 60 and an outer shell 62. The inner member 60 is cylindrical. The outer shell 62 is cylindrical. The outer shell 62 accommodates the inner member 60. The outer shell 62 is a separate body from the inner member 60. In the present embodiment, the inner member 60 and the outer shell 62 are made of metal. In this embodiment, the static friction coefficient between the inner member 60 and the outer shell 62 is smaller than the static friction coefficient between the lock ring pressing surface 52 and the lock ring 14.

  The inner member 60 includes a connection pipe communication port 70, a tapered surface 72, a lock ring fitting groove 74, and a joint body communication port 76. The connecting pipe communication port 70 is disposed at one end of the inner member 60. The tapered surface 72 is disposed next to the connection pipe communication port 70 on the inner peripheral surface of the inner member 60. The taper surface 72 has an inner diameter that increases as the distance from the connection pipe communication port 70 increases. The lock ring insertion groove 74 is disposed at the back of the tapered surface 72 when viewed from the connection pipe communication port 70. The lock ring 14 is accommodated in the lock ring insertion groove 74. The joint body communication port 76 is disposed at the other end of the inner member 60. When the lock ring housing nut 12 is connected to the joint body 10, the joint body communication port 76 faces the joint body 10.

  The lock ring fitting groove 74 has a bottom surface 80, a taper side surface 82, and a joint main body entrance side surface 84. The bottom surface 80 faces the internal space of the lock ring housing nut 12. The tapered side surface 82 is disposed on the tapered surface 72 side when viewed from the bottom surface 80. In the present embodiment, the tapered side surface 82 forms a ridge 88 with the tapered surface 72. The joint main body entrance side surface 84 faces the taper side surface 82 across the bottom surface 80. The joint main body entrance side surface 84 is disposed on the joint main body entrance 98 side, which will be described later, when viewed from the bottom surface 80. In the case of this embodiment, the joint main body entrance side surface 84 is higher than the taper side surface 82 when viewed from the bottom surface 80.

  The outer shell 62 includes a connection pipe passage port 90, an inner member pressing portion 92, an inner member accommodating portion 94, a female screw 96, a joint main body entrance 98, and a nut locking protrusion 99. The connecting pipe passage port 90 is disposed at one end of the outer shell 62. One end of the connection pipe 150 passes through the connection pipe passage port 90. The connection pipe passage port 90 faces the connection pipe communication port 70. Since the connecting pipe passage port 90 and the connecting pipe communication port 70 face each other, one end portion of the connection pipe 150 that has passed through the connection tube passage port 90 passes through the inside of the inner member 60 via the connection pipe communication port 70. To do. The inner member pressing portion 92 of the inner member 60 is disposed around the connection pipe passage port 90. The inner member pressing portion 92 faces one end of the inner member 60. The inner member 60 is accommodated in the inner member accommodating portion 94. The shape of the inner peripheral surface of the inner member accommodating portion 94 is a shape in which the inner member 60 fits completely. As described above, the inner member 60 is cylindrical. Accordingly, the inner member 60 can rotate within the outer shell 62. The female screw 96 is disposed on the inner periphery of the lock ring housing nut 12 at the back of the inner member housing portion 94 when viewed from the connection pipe passage port 90. Therefore, when the inner member 60 is accommodated in the inner member accommodating portion 94, the position of the female screw 96 viewed from the connection pipe passage port 90 is the back of the tapered surface 72. The female screw 96 is screwed with the male screw 32 of the joint body 10. By this screwing, the female screw 96 can convert the torque received by the outer shell 62 into a force in the direction of the tapered surface 72 viewed from the joint main body entrance 98 and apply it to the joint main body 10. The joint main body entrance 98 is disposed at the other end of the outer shell 62. The joint main body entrance 98 communicates with the joint main body communication port 76 of the inner member 60 through a space surrounded by the female screw 96. The receiving portion 30 of the joint main body 10 enters the joint main body entrance 98. The joint main body entrance 98 faces the connection pipe passage port 90 with the female screw 96 and the tapered surface 72 interposed therebetween. The nut locking protrusion 99 is provided on the inner peripheral surface of the outer shell 62 next to the joint main body entrance 98. The nut locking protrusion 99 is caught by the end side outer peripheral protrusion 38. This prevents the lock ring housing nut 12 from falling off the joint body 10.

  FIG. 3 is a cross-sectional view of the distal end portion of the receiving portion 30 of the joint body 10, the inner member 60 of the lock ring housing nut 12, and the lock ring 14. Based on FIG. 3, the structure of the lock ring 14 is demonstrated. In the case of the present embodiment, the lock ring 14 is formed by rounding a wire rod into an annular shape. The cross-sectional shape of the wire is a circular shape with a part recessed. In the case of this embodiment, the lock ring 14 has a portion that is not connected. Therefore, in the case of this embodiment, the shape of the lock ring 14 is C-shaped. In the present embodiment, the lock ring 14 has an outer peripheral portion 100, a main body facing surface 102, and an inner facing portion 104. The outer peripheral portion 100 is fitted in the lock ring insertion groove 74. The main body facing surface 102 protrudes from the lock ring fitting groove 74 and faces the receiving portion 30 of the joint main body 10. The internal facing portion 104 faces the internal space of the lock ring housing nut 12. The outer peripheral part 100 has a taper side curved surface 110 and a joint main body entrance side curved surface 112. The taper side curved surface 110 is disposed along a ridge 88 formed by the taper surface 72 and the taper side surface 82. When the lock ring 14 is pressed by the lock ring pressing surface 52, the tapered curved surface 110 comes into contact with the ridge 88 and gets over the ridge 88. As is clear from the cross-sectional shape of the wire rod, which is the material of the lock ring 14, a cross section perpendicular to the longitudinal direction of the outer peripheral portion 100 in the cross section of the tapered curved surface 110 (that is, the cross section of the lock ring 14 shown in FIG. The shape of the taper side curved surface 110 portion) is an arc shape. The joint main body entrance-side curved surface 112 is integrally continuous with the main body facing surface 102. The joint main body entrance side curved surface 112 is arranged along the joint main body entrance side surface 84 of the lock ring fitting groove 74. Of the cross section of the joint main body entrance side curved surface 112, the cross section orthogonal to the longitudinal direction of the outer peripheral portion 100 (that is, the joint main body entrance side curved surface 112 portion of the cross section of the lock ring 14 shown in FIG. 3) is circular. It is arcuate. The inner facing portion 104 is provided with a connecting pipe retaining projection 120. This connection pipe removal prevention protrusion 120 protrudes in a direction toward the internal space of the lock ring housing nut 12. In the case of the present embodiment, the edge of the recessed portion of the wire material that is the material of the lock ring 14 is a part of the connection pipe retaining projection 120. As a result, the distal end shape of the connection pipe retaining projection 120 becomes a linear shape over the entire inner periphery of the lock ring 14. In the case of the present embodiment, the distance between the opposing portions of the tip of the connection pipe retaining projection 120 is larger than the inner diameter of the passage portion 54.

[Description of manufacturing method]
The manufacturing method of the pipe joint concerning this embodiment is as follows. First, the manufacturer manufactures the joint body 10, the lock ring housing nut 12, the lock ring 14, the first seal 16, and the second seal 18. A well-known method can be employ | adopted for these manufacture. After these are manufactured, the manufacturer fits the first seal 16 and the second seal 18 in the first seal groove 34 and the second seal groove 36 of the joint body 10. The manufacturer fits the outer peripheral portion 100 of the lock ring 14 into the lock ring fitting groove 74 of the lock ring receiving nut 12. The manufacturer screws the lock ring housing nut 12 into the joint body 10 until the nut locking protrusion 99 is caught by the end-side outer peripheral protrusion 38. The end-side outer peripheral projection 38 is hooked with the nut loosening projection 99 of the lock ring housing nut 12, so that the lock ring housing nut 12 is prevented from falling off from the joint body 10. As a result, the lock ring pressing surface 52 of the joint body 10 faces the body facing surface 102 of the lock ring 14 in the lock ring housing nut 12. Thereby, the pipe joint concerning this embodiment is completed.

[Description of usage]
FIG. 4 is a cross-sectional view illustrating a state in which the connection pipe 150 is inserted into the pipe joint according to the present embodiment. FIG. 5 is a cross-sectional view at the time when the lock ring 14 of the pipe joint according to the present embodiment starts to squeeze. FIG. 6 is a cross-sectional view after the lock ring 14 of the pipe joint according to the present embodiment has digged into the connection pipe 150. Based on FIG. 4 thru | or FIG. 6, the usage method (connection method of the connecting pipe 150 by a pipe joint) concerning this embodiment is demonstrated.

  First, the operator causes one end of the connection pipe 150 to enter the joint body 10. One end of the connection pipe 150 passes through the lock ring accommodation nut 12 via the connection pipe passage port 90 of the lock ring accommodation nut 12. Subsequently, one end of the connection pipe 150 enters the joint body 10 from one end of the joint body 10. As the joint body 10 enters, one end of the connecting pipe 150 sequentially spreads the second seal 18 and the first seal 16. FIG. 4 shows this situation. As described above, in the case of the present embodiment, the distance between the opposing portions of the tip of the connection pipe removal preventing projection 120 of the lock ring 14 is larger than the inner diameter of the passage portion 54. That is, the inner diameter of the lock ring 14 is larger than the inner diameter of the passage portion 54. Since the inner diameter of the lock ring 14 is larger than the inner diameter of the passage portion 54, one end of the connection pipe 150 does not contact the lock ring 14 when the connection pipe 150 enters.

  After one end of the connection pipe 150 penetrates the first seal 16, when the one end of the connection pipe 150 reaches the back of the first seal groove 34 when viewed from the connection pipe entrance 50, the operator manually locks the ring. Tighten the receiving nut 12. When the lock ring receiving nut 12 is tightened, the female screw 96 of the outer shell 62 converts the torque received by the outer shell 62 into a force in the direction of the tapered surface 72 viewed from the joint main body entrance 98, and the male screw 32 passes through the male screw 32. The force is applied to the joint body 10. As a result, when viewed from any point on the lock ring housing nut 12, the portion of the joint body 10 that has entered from the joint body entrance 98 has a female thread 96 in the direction of the tapered surface 72 viewed from the joint body entrance 98. It will be moved by. In parallel with this, the operator causes one end portion of the other connection pipe 150 to enter from the other end of the joint body 10 into the joint body 10 in the same procedure. That is, one end of the two connecting pipes 150 enters the both ends of the joint body 10 almost simultaneously. As the lock ring housing nut 12 is tightened (as a result, the portion of the joint body 10 that has entered from the joint body entrance 98 is moved by the female screw 96), the lock ring pressing surface 52 of the joint body 10 is locked. Press ring 14. The pushed lock ring 14 is pushed out from the lock ring fitting groove 74. The taper-side curved surface 110 of the lock ring 14 contacts and climbs over the ridge 88. At this time, the main body facing surface 102 of the lock ring 14 and the joint main body entrance-side curved surface 112 slide on the surface of the lock ring pressing surface 52. As a result, the lock ring 14 is elastically deformed. As the lock ring is pushed out from the lock ring insertion groove 74, the inner diameter of the lock ring 14 is reduced. FIG. 5 shows this situation.

  Even after the lock ring 14 is pushed out of the lock ring insertion groove 74, the operator continues to tighten the lock ring receiving nut 12 by hand. Accordingly, the force is received from the tapered surface 72 of the inner member 60, so that the lock ring 14 is narrowed. When the lock ring 14 is squeezed, the connecting pipe retaining protrusion 120 bites into the connecting pipe 150. As the biting of the connection pipe removal preventing projection 120 becomes deeper, the tightening torque of the lock ring housing nut 12 increases. When the tightening torque of the lock ring housing nut 12 increases, the operator tightens the lock ring housing nut 12 with a known tool. Accordingly, a force is received from the tapered surface 72 of the inner member 60, so that the lock ring 14 is further narrowed. FIG. 6 shows this situation. When the end of the lock ring housing nut 12 comes into contact with the side surface 55 of the nut contact portion 42 of the joint body 10 after the nut locking projection 99 of the lock ring housing nut 12 gets over the central outer peripheral projection 40 of the joint body 10, The person finishes tightening the lock ring receiving nut 12. When the nut locking protrusion 99 of the lock ring receiving nut 12 gets over the central outer peripheral protrusion 40 of the joint body 10, the lock ring receiving nut 12 is not loosened. Thereby, even if the force in the direction of pulling out the connection pipe 150 from the joint body 10 is applied to the connection pipe 150, the connection pipe 150 does not come out of the joint body 10. Further, when the lock ring receiving nut 12 is sufficiently tightened, the end of the lock ring receiving nut 12 comes into contact with the side surface 55 of the nut contact portion 42, so that the operator can connect the end of the lock ring receiving nut 12 to the side surface of the nut contact portion 42. Whether or not the lock ring housing nut 12 is sufficiently tightened can be easily determined based on whether or not it is in contact with 55.

[Effect of pipe joint according to this embodiment]
As described above, in the pipe joint according to the present embodiment, the lock ring pressing surface 52 of the joint body 10 approaches the body facing surface 102 of the lock ring 14 in the lock ring housing nut 12 and pushes it. The lock ring 14 pressed by the lock ring pressing surface 52 comes out of the lock ring insertion groove 74. When the lock ring 14 exits the lock ring insertion groove 74, the lock ring 14 is squeezed. The lock ring 14 is narrowed by the tapered surface 72 as it is further pushed in the direction of the connecting pipe passage opening 90. Thereby, compared with the case where the lock ring 14 is narrowed only by the tapered surface 72, the amount of screwing of the lock ring housing nut 12 necessary for fixing the connection pipe 150 to the joint body 10 (and thus the connection pipe 150 is connected to the joint body). The amount of movement of the lock ring housing nut 12 required for fixing to 10 is reduced. The torque of the lock ring receiving nut 12 necessary for the lock ring 14 to bite into the outer peripheral surface of one end of the connection pipe 150 is obtained by pushing the lock ring 14 into the gap between the inner periphery of the joint body 10 and the outer periphery of the connection pipe 150. It is low compared with the torque to go. As a result, the force required for the lock ring 14 to bite into the outer peripheral surface of the one end portion of the connection pipe 150 pushes the lock ring 14 into the gap between the inner periphery of the joint body 10 and the outer periphery of the connection pipe 150. This is lower than the force that needs to be applied to the ring container 12. As a result, the amount of work for fixing the connecting pipe 150 to the joint body 10 can be reduced, and the force required to fix the connecting pipe 150 to the joint body 10 can be reduced.

  Further, in the pipe joint according to the present embodiment, the lock ring 14 pressed by the lock ring pressing surface 52 contacts and climbs over the ridge 88. As a result, the lock ring 14 is narrowed. When the lock ring accommodation nut 12 is screwed in the same amount, the curved surface or the tapered surface is formed between the taper side surface 82 and the inner periphery of the lock ring accommodation nut 12 because the ridge 88 gets over and narrows. In contrast, the lock ring 14 is narrowed. In the pipe joint according to the present embodiment, when the lock ring 14 is narrowed, the joint main body entrance-side curved surface 112 is not integral with the main body facing surface 102 and the outer peripheral portion 100 of the lock ring 14 is the joint main body entrance-side curved surface. The lock ring 14 slides smoothly on the lock ring pressing surface 52 as compared with the case where a flat surface is provided instead of the 112. When the lock ring 14 smoothly slides on the lock ring pressing surface 52, the possibility that the tightening torque rapidly increases or decreases during the tightening of the lock ring housing nut 12 is reduced as compared with the case where the lock ring 14 does not slide smoothly. When the possibility decreases, the possibility that the force required for the movement rapidly increases or decreases during the movement of the lock ring container 12 also decreases.

  Further, in the pipe joint according to the present embodiment, the lock ring housing nut 12 necessary for fixing the connection pipe 150 to the joint body 10 is compared with the case where the lock ring insertion groove 74 and the tapered surface 72 are separated from each other. Screw amount is small.

  Moreover, in the pipe joint according to the present embodiment, the lock ring 14 is unlikely to get over the edge of the joint main body entrance side surface 84, so the lock ring 14 is difficult to fit into the gap between the joint main body 10 and the lock ring housing nut 12. As a result, the retaining action of the lock ring 14 is not easily lost.

  Moreover, in the pipe joint according to the present embodiment, the static friction coefficient between the inner member 60 and the outer shell 62 is smaller than the static friction coefficient between the lock ring pressing surface 52 and the lock ring 14. Thereby, compared with the case where the inner member 60 is fixed to the outer shell 62 and the case where the lock ring housing nut 12 is made of a single component, the tightening torque of the lock ring housing nut 12 can be reduced.

<Description of modification>
The embodiments disclosed herein are illustrative in all respects. The scope of the present invention is not limited based on the above-described embodiment. Of course, various design changes may be made without departing from the spirit of the present invention.

  For example, the structure of the lock ring housing nut 12 is not limited to the above-described one. For example, the lock ring receiving nut may not be configured as a separate body of the inner member 60 and the outer shell 62. The lock ring receiving nut may be an integral one. The female screw 96 may not engage with the male screw 32 provided in the joint body 10. For example, the internal thread 96 may be engaged with an external thread provided on an object fixed to the joint body 10. The pipe joint according to the present invention may include a pair of lock ring accommodation nuts described below instead of the two lock ring accommodation nuts 12 described above. One of the pair of lock ring housing nuts has a male screw that meshes with the female screw 96 of the other lock ring housing nut instead of the female screw 96. The pipe joint according to the present invention may include a lock ring housing described below instead of the lock ring housing nut 12. The lock ring container has a moving portion instead of the female screw 96. The moving part moves a portion of the joint body 10 that has entered from the joint body entrance 98 toward the tapered surface 72 viewed from the joint body entrance 98. The specific form for that is not specifically limited.

  Further, the form of the lock ring insertion groove 74 is not limited to that described above. The height of the joint main body entrance side surface 84 when viewed from the bottom surface 80 may be the same as that of the taper side surface 82. The height of the joint main body entrance side surface 84 when viewed from the bottom surface 80 may be higher than the taper side surface 82.

In addition, a surface that is a part of the inner peripheral surface of the inner member 60 is formed between the tapered surface 72 and the tapered side surface 82, and the tapered side surface 82 forms a ridge 88 with the surface. May be .

  Further, the form of the lock ring 14 is not limited to that described above.

  Moreover, the raw material of the pipe joint concerning this invention is not specifically limited.

  Further, the receiving port 30 and the male screw 32 may be provided only at one end of the joint body. In this case, the structure of the other end of the joint body is not particularly limited. In this case, the opening 30 enters the lock ring housing nut 12. The female screw 96 of the lock ring receiving nut 12 is screwed with the male screw 32. Further, the form of the joint body is not limited to that described above. For example, the joint body may be L-shaped or T-shaped. FIG. 7 is an external view of a pipe joint according to another embodiment of the present invention. In FIG. 7, a part of the pipe joint is removed. Based on FIG. 7, the structure of the pipe joint will be described.

  The pipe joint shown in FIG. 7 includes a joint body 210, a pair of lock ring receiving nuts 212, a pair of lock rings 14, a pair of first seals 16, a pair of second seals 18, and a pair of nut stoppers. A ring 220. One end of the connection pipe 150 is inserted into the joint body 210. The joint main body 210 is cylindrical. Therefore, the joint body 210 is hollow. The lock ring housing nut 212 is connected to the joint body 210. The connecting pipe 150 described above passes through the lock ring housing nut 212 connected to the joint body 210. The lock ring 14 is housed inside the lock ring housing nut 212. The first seal 16 and the second seal 18 are accommodated in the joint body 210. The nut retaining ring 220 is fitted on the outer periphery of the joint body 210. When the nut locking protrusion 99 of the lock ring housing nut 212 gets over the nut retaining ring 220 of the joint body 210, the lock ring housing nut 212 is not loosened.

  The joint body 210 is made of metal. The joint body 210 includes a pair of receiving portions 30, a pair of male screws 32, a pair of first seal grooves 34, a pair of second seal grooves 36, a pair of end-side outer peripheral projections 38, and a pair of central sides. It has an outer peripheral groove 240 and a nut contact portion 42. The central outer peripheral groove 240 is disposed on the outer periphery of the joint body 10. The position of the center side outer peripheral groove 240 is closer to the center of the joint body 10 than the end side outer peripheral protrusion 38. In the case of this embodiment, the center side outer peripheral groove 240 surrounds the outer periphery of the joint body 10. The nut retaining ring 220 is fitted in the central outer peripheral groove 240.

  The lock ring housing nut 212 includes an inner member 60, an outer shell 62, and a sliding ring member 264. The sliding ring material 264 is disposed in the gap between the inner member 60 and the outer shell 62. Since the lock ring housing nut 212 includes the sliding ring member 264, the inner member 60 is slidable in the outer shell 62 compared to the case where the lock ring housing nut 212 does not include the sliding ring member 264.

  The other points of the pipe joint shown in FIG. 7 are the same as those of the pipe joint shown in FIG. Therefore, detailed description thereof will not be repeated.

  In the pipe joint shown in FIG. 7, the lock ring housing nut 212 can be shallowly screwed, and the tightening torque of the lock ring housing nut 12 can be reduced. In particular, if the nominal diameter is the same, the tightening torque of the lock ring housing nut 12 is lower than that of the pipe joint shown in FIG. This is because the lock ring housing nut 212 has the sliding ring material 264. During the tightening of the lock ring housing nut 212, the possibility that the tightening torque rapidly increases or decreases is low. The retaining action of the lock ring 14 is not easily lost.

10, 210 ... joint body,
12, 212 ... lock ring receiving nut,
14 ... Lock ring,
16 ... first seal,
18 ... second seal,
30 ... Reception part,
32 ... Male thread,
34. First seal groove,
36 ... second seal groove,
38 ... end side outer periphery protrusion,
40. Center side outer peripheral projection,
42 ... nut contact portion,
50 ... Connection pipe entrance,
52 ... Lock ring pressing surface,
54 ... passage part,
55 ... side,
60 ... inner member,
62 ... outer shell,
70 ... Connection pipe communication port,
72 ... taper surface,
74 ... Lock ring insertion groove,
76 ... Joint body communication port,
80 ... bottom surface,
82 ... taper side surface,
84 ... side surface of the joint main body entrance side,
88 ... Ridge,
90 ... Connection pipe passage opening,
92 ... Inner member pressing portion,
94 ... Inner member accommodating portion,
96 ... female thread,
98 ... Joint body entrance,
99 ... Nut locking protrusion,
100 ... outer periphery,
102 ... Main body facing surface,
104 ... internal facing part,
110 ... tapered curved surface,
112 ... Joint main body entrance side curved surface,
120 ... Connection pipe retaining projection,
150 ... connecting pipe,
220 ... Nut retaining ring 264 ... Sliding ring material,

Claims (5)

A hollow joint body having a connection pipe entrance which is an entrance of one end of the connection pipe;
A lock ring for preventing one end of the connection pipe from coming off from the joint body;
The lock ring is housed, and a portion of the joint body where at least the connection pipe entrance is provided enters an inner periphery, and includes a lock ring housing body through which the connection pipe passes,
The lock ring container is
A connection pipe passage port through which one end of the connection pipe passes;
A tapered surface disposed on the inner periphery and having an inner diameter that increases as the distance from the connecting pipe passage port increases;
A joint main body entrance that is an entrance of the portion of the joint body where the connection pipe entrance is provided and that faces the connection pipe passage through the tapered surface;
A pipe joint having a moving part that moves a portion that has entered from the joint body entrance of the joint body in the direction of the tapered surface viewed from the joint body entrance,
The lock ring container further includes a lock ring fitting groove disposed between the tapered surface and the joint main body entrance of the inner periphery,
The lock ring is
An outer periphery that fits into the lock ring insertion groove;
A main body facing surface that protrudes from the lock ring fitting groove and faces the joint main body,
The joint body has an annular lock ring pressing surface in addition to the connection pipe entrance,
The locking ring pressing surface is disposed around the connection tube entrance, the faces in the locking ring containing body to the body facing surface of the locking ring, the outer diameter than the inner diameter of the locking ring rather large,
The lock ring insertion groove is
A bottom surface facing the internal space of the lock ring container;
A tapered side surface that is disposed on the tapered surface side as viewed from the bottom surface and forms a ridge with the inner periphery of the lock ring container;
A joint body entrance side surface disposed on the joint body entrance side as seen from the bottom surface;
The outer periphery of the lock ring is
It is arranged along the ridge of the lock ring insertion groove, and when the lock ring is pushed by the lock ring pressing surface, it contacts the ridge of the lock ring insertion groove and gets over the ridge. A taper-side curved surface in which the shape of the cross section perpendicular to the longitudinal direction of the
A joint body which is continuous with the body-facing surface and is arranged along the joint body entrance side surface of the lock ring fitting groove, and whose cross-sectional shape perpendicular to the longitudinal direction of the outer peripheral portion is an arc shape. A pipe joint having a curved surface on the entrance side . 2. The pipe joint according to claim 1 , wherein the tapered side surface forms the tapered surface and the ridge in the inner periphery of the lock ring container. Tube fitting of claim 1, prior Symbol joint body entrance side surface is equal to or higher than the tapered side surface as viewed from the bottom. The lock ring container is
A cylindrical inner member in which the tapered surface and the lock ring fitting groove are arranged on the inner periphery,
The inner member is a separate body, accommodates the inner member, and has a cylindrical outer shell in which the connection pipe passage port, the moving portion, and the joint main body entrance are disposed,
The outer shell has an inner member pressing portion disposed around the connecting pipe passage opening and facing one end of the inner member;
The moving part has a screw that converts the torque received by the outer shell into a force in the direction of the tapered surface viewed from the joint main body entrance and applies the force to the joint main body,
The pipe joint according to claim 1, wherein a coefficient of static friction between the inner member and the outer shell is smaller than a coefficient of static friction between the lock ring pressing surface and the lock ring. The screw of the moving part of the lock ring container is disposed in the inner periphery of the lock ring container in the back of the tapered surface and in front of the joint main body entrance as viewed from the connection pipe passage port. Female thread,
The joint body has a cylindrical receiving portion;
The connecting pipe entrance is disposed at one end of the receiving part;
The lock ring pressing surface is disposed around the connection pipe entrance of the receiving part,
5. The pipe joint according to claim 4 , wherein a male screw that engages with the female screw of the lock ring housing is disposed on an outer periphery of the receiving portion.

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