JP2016109170A - Socket-and-spigot type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a bad influence on the sealing performance of an elastic seal ring.SOLUTION: A socket-and-spigot type pipe joint is equipped with a joint body 10; a slip-off preventive member holding cylinder 12; a slip-off preventive member 14; a coil spring 16; and an elastic seal ring 18. A guiding cylinder 30 is projected out from one end of the joint body 10. The slip-off preventive member holding cylinder 12 covers an outer periphery of the guiding cylinder 30 so as to form a connection pipe entering cavity 50. The slip-off preventive holding cylinder 12 has a tapered surface 60. The tapered surface 60 is narrowed toward a projecting end side of the guiding cylinder 30. The coil spring 16 presses the slip-off member 14 on the tapered surface 60 of the slip-off preventive member holding cylinder 12. The elastic seal ring 18 is stuck to an inner peripheral surface of a connection pipe 100 when the connection pipe 100 enter the connection pipe entering cavity 50. The slip-off preventive member 14 has a cylindrical portion 70. The cylindrical portion 70 is narrowed by receiving force on an outer periphery when being pressed on the tapered surface 60.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plug-in type pipe joint.

  Patent document 1 discloses a plug-in type pipe joint. This plug-in type pipe joint includes a joint body, an elastic seal ring, a retaining ring, an insertion guide ring, a retaining ring holding cylinder, and a cylindrical spacer. A guide tube is formed to protrude outward in the axial direction from one end of the joint body. The retaining ring holding cylinder covers the outer periphery of the guide cylinder through the connection pipe receiving port. The connection pipe receptacle receives one end of the connection pipe. The rear end portion of the retaining ring holding cylinder is screwed to the outer periphery of one end of the joint body. A tapered surface is formed on the inner periphery on the front opening end side of the retaining ring holding cylinder. The tapered surface constricts the retaining ring. The tapered surface is narrowed toward the front opening end of the retaining ring holding cylinder. A retaining ring accommodating recess is formed between the front opening side end surface of the spacer and the tapered surface. The retaining ring is accommodated in the retaining ring accommodating recess. The spacer is fitted into the retaining ring holding cylinder. A seal ring groove is provided on the outer periphery of the guide tube. An elastic seal ring is fitted in the seal ring groove. The elastic seal ring is in close contact with the inner peripheral surface of the connecting pipe. The insertion guide ring is incorporated in the connection pipe receptacle. As the insertion guide ring is pressed at one end of the connection pipe, the insertion guide ring moves toward the inside of the connection pipe receiving port while compressing the elastic seal ring. An annular elastic member is incorporated in the retaining ring holding cylinder. The elastic member always presses the retaining ring against the tapered surface.

  In the plug-in type pipe joint disclosed in Patent Document 1, there is no gap between the insertion guide ring and one end of the connection pipe even if the insertion is stopped during the insertion of the connection pipe.

JP-A-2005-76854

  However, the plug-in type pipe joint disclosed in Patent Document 1 has a problem that the pressure of the fluid in the connecting pipe adversely affects the sealing performance of the elastic seal ring. This is because the connection pipe may expand due to the pressure of the fluid in the connection pipe. When the material of the connecting pipe is a synthetic resin, the adverse effect on the sealing performance of the elastic seal ring tends to increase.

  The present invention solves this problem. An object of the present invention is to provide a plug-in type pipe joint capable of suppressing adverse effects on the sealing performance of an elastic seal ring.

  The plug-in type 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 plug-in type pipe joint includes the joint main bodies 10 and 110, the retaining member holding cylinders 12 and 112, the retaining members 14 and 114, the elastic member 16, 116 and 216 and an elastic seal ring 18. A guide tube 30 protrudes from one end of the joint body 10, 110. A seal ring groove 40 is provided on the outer periphery of the guide tube 30. The retaining member holding cylinders 12 and 112 cover the outer periphery of the guide cylinder 30 so as to form the connection pipe entry gap 50. The connection pipe entry gap 50 is a gap for allowing one end of the connection pipe 100 to enter between the guide cylinder 30. The retaining member holding cylinders 12 and 112 have a tapered surface 60. The tapered surface 60 narrows as it approaches the protruding end side of the guide tube 30. The retaining members 14 and 114 are disposed in the connection pipe entry gap 50. The guide tube 30 passes through the retaining members 14 and 114. The retaining members 14 and 114 are surrounded by the tapered surfaces 60 of the retaining member holding cylinders 12 and 112. The elastic members 16 and 116 are disposed in the connection pipe entry gap 50. The elastic members 16 and 116 are aligned with the retaining members 14 and 114 so as to form a row along the guide tube 30. The elastic members 16 and 116 press the retaining members 14 and 114 against the tapered surfaces 60 of the retaining member holding cylinders 12 and 112. The elastic seal ring 18 is fitted into the seal ring groove 40. The elastic seal ring 18 is in close contact with the inner peripheral surface of the connection pipe 100 when the connection pipe 100 enters the connection pipe entry gap 50. The retaining members 14 and 114 have a cylindrical portion 70. When the cylindrical portion 70 is pressed against the tapered surface 60 and receives a force on the outer periphery, the cylindrical portion 70 is narrowed. The cylindrical portion 70 is penetrated by the guide tube 30.

  A seal ring groove 40 is provided on the outer periphery of the guide tube 30. The elastic seal ring 18 is fitted into the seal ring groove 40. The retaining members 14 and 114 are disposed in the connection pipe entry gap 50. The guide tube 30 passes through the retaining members 14 and 114. The retaining members 14 and 114 are surrounded by the tapered surfaces 60 of the retaining member holding cylinders 12 and 112. The elastic members 16, 116, 216 press the retaining members 14, 114 against the tapered surfaces 60 of the retaining member holding cylinders 12, 112 after the connecting pipe 100 penetrates the cylindrical portion 70 of the retaining members 14, 114. The cylindrical portions 70 of the retaining members 14 and 114 are squeezed when a force is applied to the outer periphery by being pressed against the tapered surface 60. The connecting tube 100 is tightened by the cylindrical portion 70 when the inner diameter of the cylindrical portion 70 is narrowed. The tubular portion 70 tightens the connection pipe 100, so that the connection pipe 100 receives a pressure from the fluid flowing in the connection pipe 100, rather than a ring having a circular or square cross section. 100 expansion can be suppressed. When the expansion of the connecting pipe 100 is suppressed, adverse effects on the sealing performance of the elastic seal ring 18 due to the expansion can be suppressed.

  Moreover, it is desirable that the cylindrical portion 70 described above includes a frustum-shaped portion 80 and a curved surface portion 82. The frustum-shaped portion 80 faces the tapered surface 60 of the retaining member holding cylinders 12 and 112. The outer peripheral surface of the frustum-shaped portion 80 has a frustum shape. The curved surface portion 82 is disposed on one end side of the cylindrical portion 70 when viewed from the frustum-shaped portion 80. The curved surface portion 82 narrows as it approaches one end of the tubular portion 70.

  Since the frustum-shaped portion 80 faces the tapered surface 60 of the retaining member holding cylinders 12 and 112, the elastic member 16, 116, 216 presses the retaining members 14, 114 against the tapered surface 60, so that the frustum-shaped portion 80 contacts the tapered surface 60. When the frustum-shaped part 80 contacts the tapered surface 60, the connecting pipe 100 has a connecting pipe entry gap 50 compared to a case where the outer diameter of the cylindrical part 70 is uniform and its end part contacts the tapered surface 60. The possibility that the cylindrical portion 70 is largely inclined with respect to a predetermined direction that can proceed smoothly is reduced. Further, when the frustum-shaped portion 80 contacts the tapered surface 60, the center of the connection pipe 100 can be guided to a predetermined position as the cylindrical portion 70 is guided by the tapered surface 60. The possibility that the cylindrical portion 70 is largely inclined is reduced, and the center of the connection pipe 100 can be guided to a predetermined position, so that it is easy to smoothly insert the connection pipe 100 into the connection pipe entry space 50. . When the curved surface portion 82 is disposed on one end side of the cylindrical portion 70 when viewed from the frustum-shaped portion 80, the elastic members 16, 116, 216 taper the retaining members 14, 114 to the tapered surface as compared with the case where the curved surface portion 82 is not provided. Even when the retaining members 14 and 114 are tilted when pressed against 60, the tilt is easily corrected. If the inclination of the retaining members 14 and 114 is easily corrected, the possibility that the connecting pipe 100 can be smoothly inserted increases.

  Alternatively, it is desirable that the taper angle of the frustum-shaped portion 80 described above is the same as the taper angle of the tapered surface 60. Here, “same” includes a case where there is an error within the range described below. The range is a range in which the connection pipe 100 does not get blocked by an object accommodated in the connection pipe entry gap 50 even if the connection pipe 100 advances in the connection pipe entry gap 50.

  When the taper angle of the frustum-shaped portion 80 is the same as the taper angle of the taper surface 60, the retaining members 14, 114 are pressed against the taper surface 60 by the elastic members 16, 116, 216, so that the connecting pipe 100 is connected to the connecting pipe 100. The direction of the connecting pipe 100 is determined so that the entry accommodated in the entry gap 50 is not hindered. By determining the orientation of the connecting pipe 100 as described above, the connecting pipe 100 can be inserted smoothly.

  The elastic members 16, 116, 216 described above are preferably coil springs.

  When the elastic members 16, 116, and 216 are coil springs, it is possible to reduce the resistance that the connecting pipe 100 receives when the connecting pipe 100 is inserted, as compared with the case of using an elastic member such as an annular rubber.

  Moreover, it is desirable that the plug-in type pipe joint described above further includes an insertion guide ring 20. The insertion guide ring 20 is at least partially disposed in the connection pipe entry gap 50. The insertion guide ring 20 has a tapered end portion 300. The end portion 300 is disposed in the retaining members 14 and 114. A guide tube 30 passes through the insertion guide ring 20.

  When the insertion-type pipe joint further includes the insertion guide ring 20 and the insertion guide ring 20 has a tapered end portion 300, the insertion guide ring 20 is inserted into the retaining member 14 when the connection pipe 100 enters. Since 114 can be smoothly spread out, it becomes easy to smoothly insert the connecting pipe 100 into the connecting pipe entry space 50.

  According to the present invention, adverse effects on the sealing performance of the elastic seal ring can be suppressed.

It is a figure by which the structure of the plug-in type pipe joint concerning the 1st Embodiment of this invention is shown. It is a perspective view of the retaining member concerning the 1st Embodiment of the present invention. It is sectional drawing to which the retaining member concerning the 1st Embodiment of this invention was expanded. It is a figure which shows the condition where a connecting pipe is connected to the plug-in type pipe joint concerning the 1st Embodiment of this invention. It is a figure by which the structure of the plug-in type pipe joint concerning the 2nd Embodiment of this invention is shown. It is a figure by which the structure of the plug-in type pipe joint concerning the 3rd Embodiment of this invention is shown. It is an external view of the spacer concerning the 3rd Embodiment of this invention. It is a figure which shows sectional drawing of the securing member concerning the modification 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.

<First Embodiment>
[Description of structure]
FIG. 1 is a view showing a configuration of a plug-in type pipe joint according to the present embodiment. In FIG. 1, a part of the plug-in type pipe joint is removed. In FIG. 1, one end of a plug-in type pipe joint is shown. The other end of the plug-in fitting is not shown. In the case of this embodiment, it is because the structure of the other end of a plug-in type pipe joint is the same as the structure of one end. Based on FIG. 1, the structure of the plug-in type pipe joint concerning this embodiment is demonstrated. The plug-in type pipe joint according to this embodiment includes a joint body 10, a retaining member holding cylinder 12, a retaining member 14, a coil spring 16, an elastic seal ring 18, an insertion guide ring 20, and a spacer 22. .

  In the case of the present embodiment, the joint body 10 is made of synthetic resin. The joint body 10 includes a guide tube 30 and a base convex portion 32. The shape of the guide tube 30 is cylindrical. The guide tube 30 protrudes from one end of the joint body 10. A seal ring groove 40 is provided on the outer periphery of the guide tube 30. The base convex portion 32 is provided at a location corresponding to the base of the guide tube 30 in the joint body 10.

  In the case of this embodiment, the material of the retaining member holding cylinder 12 is a transparent synthetic resin. In the case of this embodiment, the shape of the retaining member holding cylinder 12 is cylindrical. The retaining member holding cylinder 12 covers the outer periphery of the guide cylinder 30 so as to form the connection pipe entry gap 50. That is, the gap between the retaining member holding cylinder 12 and the guide cylinder 30 is the connection pipe entry gap 50. The connection pipe entry gap 50 is a gap for allowing one end of the connection pipe 100 to enter between the guide cylinder 30. The retaining member holding cylinder 12 has a tapered surface 60 and a root recess 62. The tapered surface 60 is provided on the inner peripheral surface of one end of the retaining member holding cylinder 12. The tapered surface 60 narrows as it approaches one end side thereof, that is, the protruding end side of the guide tube 30. The root recess 62 is provided on the inner peripheral surface of the other end of the retaining member holding cylinder 12. The base convex portion 32 of the joint body 10 is fitted into the base concave portion 62. By fitting the base convex portion 32 into the base concave portion 62, the retaining member holding cylinder 12 is fixed to the joint body 10.

  The retaining member 14 is disposed in the connecting pipe entry gap 50. The guide tube 30 passes through the retaining member 14. The retaining member 14 is surrounded by the tapered surface 60 of the retaining member holding cylinder 12.

  The coil spring 16 is disposed in the connecting pipe entry gap 50. The coil springs 16 are lined up with the retaining members 14 so as to form a row along the guide tube 30. The coil spring 16 presses the retaining member 14 against the tapered surface 60 of the retaining member holding cylinder 12. Since the specific structure of coil spring 16 is well known, detailed description thereof will not be repeated here.

  The elastic seal ring 18 is fitted into the seal ring groove 40 on the outer periphery of the guide tube 30. The elastic seal ring 18 is in close contact with the inner peripheral surface of the connection pipe 100 when the connection pipe 100 enters the connection pipe entry gap 50. Since the specific structure of the elastic seal ring 18 is well known in the same manner as the coil spring 16, the detailed description thereof will not be repeated here.

  In the case of this embodiment, the insertion guide ring 20 is an opaque ring made of synthetic resin. The insertion guide ring 20 is disposed in the connection pipe entry gap 50. A guide tube 30 passes through the insertion guide ring 20. The insertion guide ring 20 has a tapered end portion 300. The end portion 300 is inserted into one end of the cylindrical portion 70 of the retaining member 14. As a result, the end portion 300 is disposed in the retaining member 14.

  In the present embodiment, the spacer 22 is made of synthetic resin. The spacer 22 is disposed between the joint body 10 and the coil spring 16 in the connection pipe entry gap 50. The spacer 22 supports the coil spring 16 when the coil spring 16 is pressed. The insertion guide ring 20 and the connection pipe 100 that have entered the connection pipe entry gap 50 enter the spacer 22.

  FIG. 2 is a perspective view of the retaining member 14 according to the present embodiment. FIG. 3 is an enlarged cross-sectional view of the retaining member 14 according to the present embodiment. Based on FIG.2 and FIG.3, the structure of the retaining member 14 is demonstrated. In the case of this embodiment, the retaining member 14 is made of synthetic resin. In the case of this embodiment, the retaining member 14 has only the cylindrical portion 70. Therefore, the guide cylinder 30 penetrates the cylindrical portion 70. In the case of this embodiment, a part of the cylindrical part 70 is cut away. Since a part is separated, the cylindrical part 70 can be narrowed or widened. Since it can be narrowed or widened, the cylindrical portion 70 is narrowed when it receives a force on the outer periphery by being pressed against the tapered surface 60.

  In the case of this embodiment, the cylindrical portion 70 includes a frustum-shaped portion 80, a curved surface portion 82, and a protruding portion 84. The outer peripheral surface of the frustum-shaped portion 80 has a frustum shape. Therefore, the frustum-shaped part 80 becomes narrower as it approaches the one end side of the cylindrical part 70. The frustum-shaped portion 80 is disposed so as to face the tapered surface 60 of the retaining member holding cylinder 12 in the connecting pipe entry gap 50. The curved surface portion 82 is disposed on one end side of the cylindrical portion 70 when viewed from the frustum-shaped portion 80. The curved surface portion 82 narrows as it approaches one end of the tubular portion 70. As shown in FIG. 3, the shape of the cross section of the curved surface portion 82 parallel to the central axis 102 of the cylindrical portion 70 is an arc shape. As shown in FIG. 2, the protruding portion 84 protrudes from the inner peripheral surface of the cylindrical portion 70 toward the central axis 102 of the cylindrical portion 70. The protrusion 84 bites into the connecting pipe 100, thereby preventing the connecting pipe 100 from coming out of the connecting pipe entry gap 50.

  In the case of this embodiment, the taper angle of the frustum-shaped portion 80 is the same as the taper angle of the taper surface 60 of the retaining member holding cylinder 12. Therefore, when the coil spring 16 presses the retaining member 14 against the tapered surface 60, the frustum-shaped portion 80 comes into close contact with the tapered surface 60. However, in the case of this embodiment, these taper angles have an error in the range described below. The range is a range in which the connection pipe 100 does not get blocked by an object accommodated in the connection pipe entry gap 50 even if the connection pipe 100 advances in the connection pipe entry gap 50. Therefore, when the retaining member 14 according to the present embodiment is pressed against the tapered surface 60 by the coil spring 16, the retaining member 14 rattles within the error range.

[Description of manufacturing method]
The manufacturing method of the plug-in type pipe joint according to the present embodiment is the same as that of a known plug-in type pipe joint. For example, the joint body 10 is manufactured by a well-known injection molding method. Therefore, detailed description thereof will not be repeated here.

[Description of usage]
FIG. 4 is a view showing a state in which the connecting pipe 100 made of synthetic resin is connected to the plug-in type pipe joint according to the present embodiment. Based on FIG. 4, the usage method of the plug-in type pipe joint concerning this embodiment is demonstrated.

  The user inserts one end of the connection pipe 100 into the gap between the retaining member holding cylinder 12 and the guide cylinder 30. As a result, the connection pipe 100 enters the connection pipe entry gap 50. The connection pipe 100 that has entered the connection pipe entry space 50 contacts the insertion guide ring 20. The user continues to push the connecting pipe 100 into the gap between the retaining member holding cylinder 12 and the guide cylinder 30. The insertion guide ring 20 pushes the cylindrical portion 70 of the retaining member 14 as it is pushed at one end of the connection pipe 100. The cylindrical portion 70 pushed by the insertion guide ring 20 moves in the depth direction of the connection pipe entry gap 50. As the cylindrical portion 70 moves, the coil spring 16 is compressed. The compressed coil spring 16 applies a reaction force to the cylindrical portion 70. The user continues to push the connecting pipe 100 into the gap between the retaining member holding cylinder 12 and the guide cylinder 30. Along with this, the insertion guide ring 20 pushes and expands the cylindrical portion 70. The inner diameter of the cylindrical portion 70 is increased. The insertion guide ring 20 passes through the cylindrical portion 70 having an increased inner diameter. The cylindrical portion 70 through which the insertion guide ring 20 passes is pressed against the tapered surface 60 of the retaining member holding cylinder 12 by the coil spring 16. Accordingly, the frustum-shaped portion 80 of the cylindrical portion 70 is in close contact with the tapered surface 60. The insertion guide ring 20 penetrating the cylindrical portion 70 moves from the protruding end side of the guide cylinder 30 toward the base side of the guide cylinder 30 while compressing the elastic seal ring 18. When the insertion guide ring 20 contacts the joint body 10, the connection of the connection pipe 100 is completed. When the user tries to pull out the connecting pipe 100 from the plug-in type pipe joint according to the present embodiment, the tubular portion 70 is pressed against the tapered surface 60 of the retaining member holding cylinder 12. The cylindrical portion 70 pressed against the tapered surface 60 is narrowed. When the tubular portion 70 is narrowed, the protruding portion 84 of the tubular portion 70 is strongly pressed against the connecting pipe 100. Since the tubular portion 70 is pressed against the tapered surface 60 and the projection 84 of the tubular portion 70 is strongly pressed against the connecting pipe 100, the connecting pipe 100 is difficult to be removed from the plug-in pipe joint according to the present embodiment.

[Effect of plug-in type pipe joint according to this embodiment]
When, for example, high-temperature steam is caused to flow through the connecting pipe 100 connected to the plug-in type pipe joint according to the present embodiment, the connecting pipe 100 tends to expand due to the pressure of the steam. The cylindrical portion 70 of the retaining member 14 presses the connection pipe 100 that is about to swell. Since the swelling of the connecting pipe 100 is suppressed, adverse effects on the sealing performance of the elastic seal ring 18 are also suppressed.

  In addition, since the cylindrical portion 70 has the curved surface portion 82, when the coil spring 16 presses the retaining member 14 against the tapered surface 60, even if the retaining member 14 is inclined, the inclination is easily corrected. If the inclination of the retaining member 14 is easily corrected, the possibility that the connecting pipe 100 can be smoothly inserted increases.

  Moreover, if the taper angle of the frustum-shaped portion 80 is the same as the taper angle of the taper surface 60, the retaining member 14 is pressed against the taper surface 60 by the coil spring 16, so that the connection pipe 100 is in the connection pipe entry gap 50. The direction of the connecting pipe 100 is determined so that the entry is not hindered by an object accommodated in the housing. By determining the orientation of the connecting pipe 100 as described above, the connecting pipe 100 can be inserted smoothly.

  Moreover, since the retaining member 14 is pressed against the tapered surface 60 by the coil spring 16, the resistance received by the connecting tube 100 when the connecting tube 100 is inserted can be reduced as compared with the case of using other types of elastic members.

  In addition, since the seal ring groove 40 is disposed on the base side of the guide tube 30 when viewed from the portion pressed against the tapered surface 60 of the retaining member holding tube 12 in the tubular portion 70, the seal ring groove 40 is sealed compared to the case where the seal ring groove 40 is not. The adverse effect on the effect can be suppressed more effectively.

  Moreover, since the plug-in type pipe joint includes the insertion guide ring 20, the cylindrical portion 70 can be smoothly spread out.

<Second Embodiment>
[Description of structure]
FIG. 5 is a diagram showing a configuration of the plug-in type pipe joint according to the present embodiment. In FIG. 5, a part of the plug-in type pipe joint is removed. In FIG. 5, one end of the plug-in type pipe joint is shown. The other end of the plug-in fitting is not shown. In the case of this embodiment, it is because the structure of the other end of a plug-in type pipe joint is the same as the structure of one end. Based on FIG. 5, the structure of the plug-in type pipe joint concerning this embodiment is demonstrated. The plug-in type pipe joint according to the present embodiment includes a joint body 110, a retaining member holding cylinder 112, a retaining member 114, a coil spring 116, an elastic seal ring 18, an insertion guide ring 20, a spacer 122, and a retaining member. A ring 124.

  Similar to the first embodiment, also in the present embodiment, the joint body 110 is made of synthetic resin. The joint body 110 includes a guide tube 30 and a root external thread 132. The root male thread portion 132 is provided at a location corresponding to the root of the guide tube 30 in the joint body 110.

  Similar to the first embodiment, also in this embodiment, the material of the retaining member holding cylinder 112 is a transparent synthetic resin. The retaining member holding cylinder 112 covers the outer periphery of the guide cylinder 30 so as to form the connection pipe entry gap 50. The retaining member holding cylinder 112 has a tapered surface 60 and a root female thread portion 162. The root female thread portion 162 is provided on the inner peripheral surface of the end portion on the root side of the guide tube 30 among the end portions of the retaining member holding tube 112. The root female thread portion 162 engages with the root male thread portion 132 of the joint body 110. The retaining member holding cylinder 112 is fixed to the joint body 110 by engaging the root male thread portion 132 with the root female thread portion 162.

  The retaining member 114 is disposed in the connecting pipe entry gap 50. The guide tube 30 passes through the retaining member 114. The retaining member 114 is surrounded by the tapered surface 60 of the retaining member holding cylinder 12.

  The coil spring 116 is disposed in the connecting pipe entry gap 50. The coil springs 116 are aligned with the retaining members 114 so as to form a row along the guide tube 30. The coil spring 116 presses the retaining member 114 against the tapered surface 60 of the retaining member holding cylinder 112. The difference between the coil spring 16 according to the first embodiment and the coil spring 116 according to the present embodiment is two points, that is, the length and the outer diameter. Since the specific structure of coil spring 116 is well known, detailed description thereof will not be repeated here.

  Similarly to the first embodiment, in the present embodiment, the spacer 122 is made of synthetic resin. The spacer 122 is disposed between the joint body 110 and the coil spring 116 in the connection pipe entry gap 50. The insertion guide ring 20 and the connection pipe 100 that have entered the connection pipe entry gap 50 enter the spacer 122. The difference between the spacer 22 according to the first embodiment and the spacer 122 according to the present embodiment is whether or not the coil spring support 150 is provided on the inner periphery. A coil spring support 150 is provided on the inner periphery of the spacer 122 according to this embodiment. The end portion of the coil spring 116 according to the present embodiment is supported by the coil spring support portion 150.

  In the case of this embodiment, the retaining ring 124 is formed by punching a metal plate in an annular shape. A protrusion (not shown) protrudes from the inner peripheral portion of the retaining ring 124. This protrusion prevents the connecting pipe 100 from coming out of the connecting pipe entry gap 50 by biting into the connecting pipe 100.

  In the case of this embodiment, the retaining member 114 includes a cylindrical portion 70 and a ring holding portion 172. The ring holding part 172 is provided so as to protrude from the end of the cylindrical part 70 from the side facing the coil spring 116. In the case of this embodiment, the ring holding part 172 is annular. The retaining ring 124 fits into a space surrounded by the ring holding portion 172.

[Description of manufacturing method]
The manufacturing method of the plug-in type pipe joint according to the present embodiment is the same as that of a known plug-in type pipe joint. Therefore, detailed description thereof will not be repeated here.

[Description of usage]
The method of using the plug-in type pipe joint according to this embodiment is the same as that of the plug-in type pipe joint according to the first embodiment. Therefore, detailed description thereof will not be repeated here.

[Effect of plug-in type pipe joint according to this embodiment]
Similarly to the plug-in type pipe joint according to the first embodiment, the plug-in type pipe joint according to the present embodiment can suppress adverse effects on the sealing performance of the elastic seal ring 18. In addition, the connection pipe 100 can be inserted smoothly. In addition, the resistance received by the connection pipe 100 when the connection pipe 100 is inserted can be reduced. Moreover, the adverse effect on the sealing effect can be suppressed more effectively. Moreover, the tubular portion 70 can be smoothly spread out.

<Third Embodiment>
[Description of structure]
FIG. 6 is a diagram showing a configuration of the plug-in type pipe joint according to the present embodiment. In FIG. 6, a part of the plug-in type pipe joint is removed. In FIG. 6, one end of the plug-in type pipe joint is shown. The other end of the plug-in fitting is not shown. This is because the structure of the other end of the plug-in type pipe joint is the same as the structure of the one end also in this embodiment. Based on FIG. 6, the structure of the plug-in type pipe joint concerning this embodiment is demonstrated. The plug-in type pipe joint according to the present embodiment includes a joint body 110, a retaining member holding cylinder 112, a retaining member 114, a coil spring 216, an elastic seal ring 18, an insertion guide ring 20, a spacer 222, and a retaining member. A ring 124.

  The coil spring 216 is disposed between the joint body 110 and the spacer 222 in the connection pipe entry gap 50. The coil springs 216 are aligned with the retaining members 114 so as to form a row along the guide tube 30. The coil spring 216 presses the retaining member 114 against the tapered surface 60 of the retaining member holding cylinder 112 via the spacer 222. The differences between the coil spring 16 according to the first embodiment and the coil spring 116 according to the second embodiment and the coil spring 216 according to the present embodiment are two points, that is, the length and the outer diameter. Since the specific structure of coil spring 216 is well known, detailed description thereof will not be repeated here.

  Similar to the first embodiment and the second embodiment, in the present embodiment, the spacer 222 is made of synthetic resin. The spacer 222 is disposed between the coil spring 216 and the retaining ring 124 in the connection pipe entry gap 50. The insertion guide ring 20 and the connection pipe 100 that have entered the connection pipe entry gap 50 penetrate the spacer 222. FIG. 7 is an external view of the spacer 222 according to the present embodiment. In FIG. 7, a part of the spacer 222 is removed. Based on FIG. 7, the structure of the spacer 222 concerning this embodiment is demonstrated. The spacer 222 according to the present embodiment includes a cylindrical main body 290, a ring pressing portion 292, and a coil holding portion 294. In the case of this embodiment, the cylindrical main body 290, the ring pressing portion 292, and the coil holding portion 294 are integrated. The cylindrical main body 290 is cylindrical. The insertion guide ring 20 and the connection pipe 100 penetrate through the cylindrical main body 290. The ring pressing portion 292 is annular. The ring pressing portion 292 is provided so as to protrude from the side surface on one end side of the cylindrical main body 290. The ring pressing portion 292 presses the retaining member 114 against the tapered surface 60 of the retaining member holding cylinder 112 via the retaining ring 124. The coil holding part 294 is provided so as to protrude from the side surface on the other end side of the cylindrical main body 290. The coil holding part 294 is annular. The coil spring 216 fits in a space surrounded by the coil holding part 294.

[Description of manufacturing method]
The manufacturing method of the plug-in type pipe joint according to the present embodiment is the same as that of a known plug-in type pipe joint. Therefore, detailed description thereof will not be repeated here.

[Description of usage]
The method of using the plug-in type pipe joint according to this embodiment is the same as the plug-in type pipe joint according to the first embodiment and the plug-in type pipe joint according to the second embodiment. Therefore, detailed description thereof will not be repeated here.

[Effect of plug-in type pipe joint according to this embodiment]
Similar to the plug-in type pipe joint according to the first embodiment and the plug-in type pipe joint according to the second embodiment, the plug-in type pipe joint according to this embodiment can also suppress adverse effects on the sealing performance of the elastic seal ring 18. . In addition, the connection pipe 100 can be inserted smoothly. In addition, the resistance received by the connection pipe 100 when the connection pipe 100 is inserted can be reduced. Moreover, the adverse effect on the sealing effect can be suppressed more effectively. Moreover, the tubular portion 70 can be smoothly spread out.

<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 forms of the retaining member 14 and the retaining member 114 are not limited to those described above. FIG. 8 is a cross-sectional view of a retaining member according to a modification of the present invention. This will be specifically described with reference to FIG. The taper angle of the frustum portion may be different from the taper angle of the taper surface. However, it is desirable that these angles are the same. As shown in FIGS. 8A and 8C, the cylindrical portion may not have the frustum-like portion. As shown in FIGS. 8B and 8D, the size of the curved surface portion is not particularly limited. The cylindrical part may not have a curved surface part. As shown in FIGS. 8A to 8D, the shape of the protrusion is not particularly limited.

  The elastic member 16 may be an elastic member other than the coil springs 16, 116, and 216 that presses the retaining member 14 against the tapered surface 60 of the retaining member holding cylinder 12. The plug-in type pipe joint according to the first to third embodiments may not include the insertion guide ring 20.

10, 110 ... joint body 12, 112, retaining member holding cylinder 14, 114, retaining member 16, 116, 216, coil spring 18, elastic seal ring 20, insertion guide ring 22, 122, 222, spacer 30, guide cylinder 32 ... root convex part 40 ... seal ring groove 50 ... connection pipe entry gap 60 ... taper surface 62 ... root concave part 70 ... cylindrical part 80 ... frustum part 82 ... curved surface part 84 ... projection part 100 ... connection pipe 102 ... central axis 124 ... retaining ring 132 ... root male thread part 150 ... coil spring support part 162 ... root female thread part 172 ... ring holding part 290 ... cylindrical body 292 ... ring pressing part 294 ... coil holding part 300 ... end

Claims (5)

A joint body in which a guide tube provided with a seal ring groove on the outer periphery protrudes from one end; and
A tapered surface that covers the outer periphery of the guide tube so as to form a connection tube entry gap for allowing one end of the connection tube to enter between the guide tube and narrows as it approaches the protruding end side of the guide tube. A retaining member retaining cylinder,
A retaining member that is disposed in the connecting pipe entry gap, is penetrated by the guide tube, and is surrounded by the tapered surface of the retaining member holding tube;
An elastic member that is arranged in the connection pipe entry gap, is aligned with the retaining members so as to form a row along the guide tube, and presses the retaining member against the tapered surface of the retaining member holding tube;
An insertion-type pipe joint comprising an elastic seal ring that is fitted in the seal ring groove and closely contacts an inner peripheral surface of the connection pipe when the connection pipe enters the connection pipe entry gap.
The plug-in type pipe joint according to claim 1, wherein the retaining member has a cylindrical portion that is narrowed when pressed against the tapered surface and receives a force on an outer periphery, and through which the guide tube passes. The tubular portion is
A frustum-shaped portion facing the tapered surface of the retaining member holding cylinder and having an outer peripheral surface that is frustum-shaped,
2. The insertion according to claim 1, further comprising: a curved surface portion that is disposed on the one end side of the cylindrical portion as viewed from the frustum-shaped portion and narrows toward the one end of the cylindrical portion. Type pipe fittings.   The plug-in type pipe joint according to claim 2, wherein a taper angle of the frustum-shaped portion is the same as a taper angle of the tapered surface.   The plug-in type pipe joint according to claim 1, wherein the elastic member is a coil spring.   It further includes an insertion guide ring that is at least partially disposed in the connection pipe entry gap, has a tapered end portion disposed in the retaining member, and is penetrated by the guide tube. The plug-in type pipe joint according to claim 1, wherein:

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