JP2013245743A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the connection of a holding member, and to achieve space saving.SOLUTION: A pipe joint includes a joint body 10, a holding member 16, and a lock ring 12. The joint body 10 has a ring retainer therein. A pipe 200 enters the joint body 10. The holding member 16 has a ring holding part and a through-hole. The ring holding part faces the ring retainer with a predetermined space. The pipe 200 passes through the through-hole. The lock ring 12 has an annular part 60 and a biting part 62. The annular part 60 is housed between the ring retainer and the ring holding part. The biting part 62 protrudes from the annular part 60. The biting part 62 bites into the surface of the pipe 200. The joint body 10 has not only the ring retainer but also an in-body recess. The holding member 16 also has a protrusion and a recess in the holding member. The protrusion is fitted into the in-body recess of the joint body 10. The recess in the holding member is provided at the inner peripheral surface of the through-hole.

Description

  The present invention relates to a pipe joint.

  Patent document 1 discloses a coupling. This joint includes a tubular joint body and a tubular push ring. An annular receiving surface, a contact surface, and a female thread portion are provided in the joint body. A plurality of lock rings are engaged with the receiving surface. The lock ring has a plurality of bites. These biting portions protrude inward of the lock ring. A spacer is sandwiched between the lock rings. The spacer is formed in an annular shape. The press ring has a male thread portion. The push ring positions and fixes the lock ring. The male thread part of the press ring meshes with the female thread part in the joint body. A tube made of a soft metal material is inserted through the pusher wheel until it comes into contact with the contact surface. The end of the tube is engaged with the biting portion of the lock ring. The biting portion prevents the tube from coming off.

  The joint disclosed in Patent Document 1 has a problem that it takes time to connect the pipes. Patent document 2 discloses the pipe joint which can solve this problem. The pipe joint disclosed in Patent Document 2 includes a joint body, a seal member, a guide member, a locking member, and a holding member. In the joint body, an outer cylinder part and an inner cylinder part are coaxially formed at one end. A pipe body is inserted into the joint main body from an opening at one end thereof in an annular housing space formed between the outer cylinder part and the inner cylinder part. The seal member is provided on the outer peripheral surface of the inner cylinder portion. The guide member has an annular shape. The guide member is provided so as to be movable in the axial direction of the housing space at the end of the housing space on the opening side of the sealing member. The locking member locks the tube body in the joint body. The holding member prevents the locking member from falling off the joint body. In this pipe joint, a protrusion is provided on the inner peripheral surface of the holding member. A concave portion is provided on the outer peripheral surface of the outer cylinder portion. The protrusion on the inner peripheral surface of the holding member fits into the concave portion on the outer peripheral surface of the outer cylinder portion.

JP 2000-249268 A JP 2009-133448 A

  The pipe joint disclosed in Patent Document 2 has a problem that it is difficult to make it easy to connect the holding member and to save space of the pipe joint. According to the joint disclosed in Patent Literature 2, when the holding member is inserted into the outer tube portion, the connection of the holding member is completed. Thereby, a holding member can be connected easily. However, the structure of the pipe joint (the holding member and the outer cylinder portion are connected by the protrusion on the inner peripheral surface of the holding member being fitted into the concave portion of the outer peripheral surface of the outer cylinder portion) has a large outer diameter. It is a cause that requires a member. In order to make the outer diameter of the holding member small, it is necessary that the holding member and the joint body be connected at a portion of the holding member that enters the inside of the joint body. However, in the structure in which the holding member and the joint body are connected at that portion, a large force is required to allow the holding member to enter the inside of the joint body. The present invention has been made to solve this problem. An object of the present invention is to provide a pipe joint that can easily connect a holding member and can realize space saving.

  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 a tubular joint body 10, a holding member 16, and a lock ring 12. The joint body 10 has a ring receiving portion 34 inside. The pipe 200 enters the inside of the joint body 10. The holding member 16 has a ring holding part 70 and a through hole 72. The ring holding part 70 enters the joint body 10 from the end 30 of the joint body 10. The ring holding part 70 faces the ring receiving part 34 with a predetermined interval. The tube 200 passes through the through hole 72. The lock ring 12 has an annular portion 60 and a biting portion 62. The annular portion 60 is accommodated between the ring receiving portion 34 and the ring holding portion 70. The biting portion 62 protrudes from the annular portion 60. The biting part 62 bites into the surface of the tube 200. The joint main body 10 has a main body recess 32 in addition to the ring receiving portion 34. The main body recess 32 is disposed on the end 30 side of the ring body 34 in the inside of the joint body 10. The holding member 16 further includes a convex portion 74 and a concave portion 76 in the holding member. The convex portion 74 is disposed on the penetration side of the tube 200 as viewed from the ring holding portion 70. The protrusion 74 fits into the in-body recess 32 of the joint body 10. The holding member inner recess 76 is provided on the inner peripheral surface of the through hole 72.

  When the convex portion 74 is fitted into the main body concave portion 32, the holding member 16 and the joint body 10 are connected. Since the holding member inner recess 76 is provided on the inner peripheral surface of the through hole 72 of the holding member 16, both ends of the holding member 16 receive a force compared to the case where the holding member inner recess 76 is not provided. It becomes easy to be constricted in case of. Since it becomes easy to squeeze, the approach of the holding member 16 becomes easy. Since the entrance of the holding member 16 becomes easy, the connection of the holding member 16 to the joint body 10 is easy. The main body concave portion 32 is disposed inside the joint body 10 and the convex portion 74 is fitted into the main body concave portion 32, so that space saving can be realized.

  Alternatively, it is desirable that the above-described in-holding-member concave portion 76 is disposed at a position on the back side when viewed from the convex portion 74.

  If the holding member inner concave portion 76 is disposed at a position on the back side when viewed from the convex portion 74, the holding member 16 is likely to be narrowed when receiving a force, compared to the case where the holding member inner concave portion 76 is not provided. Become. Since it becomes easy to squeeze, the approach of the holding member 16 becomes easy. Since the entrance of the holding member 16 becomes easy, the connection of the holding member 16 to the joint body 10 is easy.

  Alternatively, it is desirable that the holding member inner recess 76 described above has a groove. In this case, the pipe joint further includes a holding member seal ring 22. The holding member seal ring 22 fits into the groove. The holding member seal ring 22 seals between the holding member 16 and the tube 200.

  The holding member seal ring 22 can prevent foreign substances entering from the outside of the pipe joint (examples of foreign substances include rainwater, dust, groundwater, mud, and earth and sand). Since foreign matter can be prevented from entering, the possibility of adverse effects on the lock ring 12 (examples of adverse effects include corrosion and functional failure) can be reduced.

  Moreover, it is desirable that the above-described pipe joint further includes a guide ring 18. The guide ring 18 is accommodated in advance in the joint body 10 or the holding member 16. The guide ring 18 is pushed by the pipe 200 and advances inside the joint body 10.

  According to the present invention, the holding member can be easily connected and space saving can be realized.

It is sectional drawing of the pipe joint concerning embodiment of this invention. It is sectional drawing of the coupling main body concerning embodiment of this invention. It is a perspective view of the lock ring concerning the embodiment of the present invention. It is sectional drawing of the holding member concerning embodiment of this invention. It is sectional drawing of the guide ring concerning embodiment of this invention. It is sectional drawing after the pipe | tube of the pipe joint concerning embodiment of this invention is inserted.

  Hereinafter, embodiments 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 a cross-sectional view of a pipe joint according to the present embodiment. In FIG. 1, a part of the pipe joint according to the present embodiment is omitted. Based on FIG. 1, the structure of the pipe joint of this embodiment is demonstrated. The pipe joint includes a joint main body 10, a lock ring 12, a washer 14, a holding member 16, a guide ring 18, a main body seal ring 20, and a holding member seal ring 22. The shape of the joint body 10 is cylindrical. In the case of this embodiment, the male screw is provided in the part which is omitted in FIG. Since the structure is well known, detailed description thereof will not be repeated here. The pipe 200 enters the inside of the joint body 10. The lock ring 12 is accommodated in the joint body 10. The pipe joint according to this embodiment includes two lock rings 12. These two lock rings 12 are accommodated in the joint body 10. The washer 14 is sandwiched between the two lock rings 12. In the case of the present embodiment, the washer 14 is provided with a hole in the central portion of the disk. The holding member 16 is fixed to the joint body 10. The guide ring 18 is accommodated in the holding member 16 until the pipe 200 enters. As the pipe 200 enters, the guide ring 18 enters the inside of the joint body 10. The main body seal ring 20 is accommodated in the joint main body 10. The main body seal ring 20 seals between the joint main body 10 and the pipe 200. The holding member seal ring 22 is housed inside the holding member 16. The holding member seal ring 22 seals between the holding member 16 and the tube 200.

  FIG. 2 is a cross-sectional view of the joint body 10 according to the present embodiment. In FIG. 2, a part of the joint body 10 is omitted. Based on FIG. 2, the structure of the coupling main body 10 of this embodiment is demonstrated. The joint body 10 includes an entry portion 30, a main body recess 32, a ring receiving portion 34, a taper portion 36, a mouth side seal groove 38, a back side seal groove 40, a tube accommodating portion 42, and a contact surface. 44. The entry portion 30 corresponds to an end portion of the joint body 10. The entry portion 30 is an opening that communicates the inside and the outside of the joint body 10. As is clear from FIG. 2, the in-body concave portion 32 is disposed closer to the entry portion 30 than the ring receiving portion 34 in the joint body 10. The holding member 16 is fixed by the body recess 32. The ring receiving portion 34 faces the ring holding portion 70 of the holding member 16 with a predetermined interval. As apparent from FIG. 2, the ring receiving portion 34 is a boundary between a portion on the entrance 30 side from there and a portion on the tube accommodating portion 42 side therefrom. Further, the inner diameters of the portion on the entrance 30 side from the ring receiving portion 34 and the portion on the tube accommodating portion 42 side from the ring receiving portion 34 are different. Therefore, it can be said that the ring receiving portion 34 according to the present embodiment is a step formed in a boundary portion between portions having different inner diameters inside the joint body 10. An annular portion 60 (the annular portion 60 will be described later) of the lock ring 12 is accommodated between the ring receiving portion 34 and the ring holding portion 70. The tapered portion 36 is a portion in which a biting portion 62 described later is accommodated when the pipe 200 enters the joint main body 10. The mouth side seal groove 38 is a groove into which one of the main body seal rings 20 is fitted. The back seal groove 40 is a groove in which the other of the main body seal rings 20 is accommodated. The tube accommodating portion 42 is a portion in which the tip portion of the tube 200 is accommodated. The contact surface 44 is a portion where the tip of the guide ring 18 contacts. By providing the contact surface 44, the guide ring 18 and the pipe 200 can not go further into the joint body 10.

  FIG. 3 is a perspective view of the lock ring 12 according to the present embodiment. Based on FIG. 3, the structure of the lock ring 12 concerning this embodiment is demonstrated. The lock ring 12 has an annular portion 60 and a biting portion 62. The annular portion 60 is a ring-shaped portion. The biting part 62 protrudes from the annular part 60. The biting portion 62 is composed of a plurality (32 in the case of this embodiment) of small pieces. The biting part 62 bites into the surface of the tube 200. When the lock ring 12 is accommodated inside the joint body 10, the biting part 62 faces in a direction between the approach direction of the pipe 200 and the center direction of the annular part 60 as viewed from the outer periphery of the annular part 60.

  FIG. 4 is a cross-sectional view of the holding member 16 according to the present embodiment. Based on FIG. 4, the structure of the holding member 16 of this embodiment is demonstrated. In the present embodiment, the material of the holding member 16 is a synthetic resin. The holding member 16 includes a ring holding part 70, a through hole 72, a convex part 74, a holding member inner concave part 76, an overhang part 78, and an inner surface step part 80. The ring holding portion 70 enters the inside of the joint body 10 from the end portion (the entry portion 30) of the joint body 10. The ring holding part 70 faces the ring receiving part 34 of the joint body 10 with a predetermined interval. The annular portion 60 of the lock ring 12 is accommodated between the ring receiving portion 34 and the ring holding portion 70. The tube 200 passes through the through hole 72. The convex portion 74 is disposed on the outer peripheral surface of the holding member 16. The protrusion 74 fits into the in-body recess 32 of the joint body 10. Thereby, the holding member 16 is fixed to the in-body recess 32 of the joint body 10. The holding member inner recess 76 is provided on the inner peripheral surface of the holding member 16. The holding member inner recess 76 is arranged at a position on the back side when viewed from the projection 74. If the concave portion 76 in the holding member is not provided, the portion of the holding member 16 where the convex portion 74 is provided is difficult to squeeze. By providing the holding member inner concave portion 76, the portion where the convex portion 74 is provided is easily narrowed. In the case of this embodiment, the holding member inner recess 76 is formed by a groove provided on the entire inner peripheral surface of the holding member 16. The holding member seal ring 22 is fitted into the holding member inner recess 76. The overhang portion 78 is provided at a position on the through hole 72 side as viewed from the ring holding portion 70. The overhang portion 78 surrounds the through hole 72. The overhanging portion 78 protrudes in the entry direction when the holding member 16 enters the inside of the joint body 10. The overhang part 78 has an overhang part taper surface 92. The protruding portion taper surface 92 narrows as it advances in the direction in which the holding member 16 enters. A retaining protrusion 102 of the guide ring 18 to be described later is caught on the inner surface stepped portion 80. This makes it difficult for the guide ring 18 to fall off the holding member 16.

  FIG. 5 is a cross-sectional view of the guide ring 18 according to the present embodiment. Based on FIG. 5, the structure of the guide ring 18 of this embodiment is demonstrated. The guide ring 18 includes a ring main body 100 and a retaining protrusion 102. The ring main body 100 is pushed into the joint main body 10 from the holding member 16 by being pushed by the pipe 200. The retaining protrusion 102 protrudes from the ring body. The retaining protrusion 102 is a protrusion for preventing the guide ring 18 from falling off from the inside due to the inner surface stepped portion 80 of the holding member 16.

[Description of connection method]
FIG. 6 is a cross-sectional view after the pipe 200 of the pipe joint according to the present embodiment is inserted. Based on FIG. 1 and FIG. 6, the usage method of the pipe joint of this embodiment is demonstrated. When using the joint according to this embodiment, first, the operator inserts the main body seal ring 20, the lock ring 12, the washer 14, and the holding member 16 (the holding member seal ring 22 is fitted into the holding member inner recess 76. 1) and the guide ring 18 is accommodated in advance in the holding member 16). At this time, the ring holding portion 70 of the holding member 16 enters the inside of the joint body 10. At that time, since the holding member inner recess 76 is provided, the ring holding portion 70 is easily narrowed. Next, the operator causes the tube 200 to enter the through hole 72 of the holding member 16. The pipe 200 that has entered the through hole 72 pushes the guide ring 18. Along with this, the guide ring 18 enters the joint body 10. The pipe 200 also enters the inside of the joint body 10. With the approach, the main body seal ring 20 and the holding member seal ring 22 are expanded. The biting portion 62 of the lock ring 12 is also expanded. When the tip portion of the guide ring 18 comes into contact with the contact surface 44, the tube 200 can no longer advance to the back of the joint body 10. FIG. 6 is a cross-sectional view showing the joint body 10 and the pipe 200 at this time. In this state, when the operator tries to pull out the tube 200, the biting portion 62 that has already bitten into the surface of the tube 200 bites into the tube 200 further deeply. The annular portion 60 of the lock ring 12 is accommodated between the ring receiving portion 34 of the joint body 10 and the ring holding portion 70 of the holding member 16. The holding member 16 is fixed at a predetermined position by fitting the convex portion 74 into the main body concave portion 32. As a result, the tube 200 does not come off. As a result, the connection between the pipe joint according to the present embodiment and the pipe 200 is completed.

[Effect of pipe joint according to this embodiment]
In the case of the present embodiment, the holding member inner concave portion 76 is disposed at a position on the back side when viewed from the convex portion 74. Thereby, compared with the case where the recessed part 76 in holding member is not provided, when making the holding member 16 approach into the inside of the coupling main body 10, the holding member 16 becomes easy to squeeze. Since it becomes easy to squeeze, the approach of the holding member 16 becomes easy. Since the entrance of the holding member 16 becomes easy, the connection of the holding member 16 to the joint body 10 is easy. The main body concave portion 32 is disposed inside the joint body 10 and the convex portion 74 is fitted into the main body concave portion 32, so that space saving can be realized.

  Further, in the case of the present embodiment, the holding member seal ring 22 can prevent foreign matters entering from the outside of the pipe joint. Since the entrance of foreign matter can be stopped, the possibility of adverse effects on the lock ring 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, and various design changes may be made without departing from the spirit of the present invention.

  For example, the structure of the portion not illustrated in FIG. 1 of the joint body 10 of the present embodiment described above is not particularly limited. This portion may be provided with a known female screw instead of the aforementioned known male screw. In this portion, as shown in FIG. 2, the entrance portion 30, the in-body recessed portion 32, the ring receiving portion 34, the taper portion 36, the mouth side seal groove 38, the back side seal groove 40, and the tube The accommodating part 42 and the contact surface 44 may be provided. In this case, the lock ring 12, the washer 14, the holding member 16, and the guide ring 18 may be accommodated in a portion that is not illustrated in FIG. 1. Moreover, the shape of the convex part 74 is not specifically limited.

  Further, the number of lock rings 12 accommodated in the joint main body 10, the number of main body seal rings 20 accommodated in the joint main body 10, and the number of holding member seal rings 22 accommodated in the holding member 16 are not particularly limited.

  Further, the position of the holding member inner recess 76 in the holding member 16 is not limited. The in-holding member recess 76 is not necessarily arranged at the position on the back side when viewed from the protrusion 74.

  Further, the holding member inner recess 76 is not limited to the holding member seal ring 22. Instead of the holding member seal ring 22, a material softer than the material of the holding member 16 may be accommodated in the holding member inner recess 76. When an object harder than the material of the holding member 16 is accommodated in the holding member inner recess 76, the holding member 16 is connected to the joint body 10 by providing a gap between the inner wall of the holding member inner recess 76 and the object. The function of making it easy to do is not impaired.

DESCRIPTION OF SYMBOLS 10: Joint main body 12: Lock ring 14: Washer 16: Holding member 18: Guide ring 20: Main body seal ring 22: Holding member seal ring 30: Entrance part 32: Recessed part 34 in body: Ring receiving part 36: Tapered part 38: Mouth side seal groove 40: Back side seal groove 42: Pipe housing portion 44: Contact surface 60: Annular portion 62: Biting portion 70: Ring holding portion 72: Through hole 74: Convex portion 76: Concavity portion 78: Tension Protruding portion 80: Inner surface stepped portion 92: Overhang portion tapered surface 100: Ring main body portion 102: Protrusion 200: Tube

Claims (4)

A cylindrical joint body having a ring receiving portion therein and into which the pipe enters,
A holding member having a ring holding portion that enters the inside of the joint main body from the end of the joint main body and faces the ring receiving portion at a predetermined interval, and a through hole through which the pipe passes;
A pipe joint comprising an annular part accommodated between the ring receiving part and the ring holding part, and a lock ring having a biting part protruding from the annular part and biting into the surface of the pipe,
In addition to the ring receiving portion, the joint main body has a concave portion in the main body that is disposed on the end side from the ring receiving portion in the inside of the joint main body.
The holding member is
A convex portion that is disposed on the penetrating side of the tube as viewed from the ring holding portion, and that fits into the concave portion in the main body of the joint body;
A pipe joint further comprising a holding member inner recess provided on an inner peripheral surface of the through hole.   The pipe joint according to claim 1, wherein the concave portion in the holding member is disposed at a position on the back side as viewed from the convex portion. The holding member inner recess has a groove;
The pipe joint according to claim 2, wherein the pipe joint further includes a holding member seal ring that fits in the groove and seals between the holding member and the pipe.   The pipe according to claim 1, further comprising a guide ring that is accommodated in advance in the joint main body or the holding member and that is pushed by the pipe and advances through the joint main body. Fittings.

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