JP2010261562A - Pipe joint, packing ring, and method for assembling pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint capable of preventing a conjugating pipe from being drawn when assembled, a packing ring used for the pipe joint, and a method for assembling the pipe joint. <P>SOLUTION: The pipe joint 10 is equipped with a push ring 3 fitted externally into a conjugating pipe, a joint pipe body 2 including a housing portion 20 enlarging in diameter toward the push ring 3, a tightener 4 enabling an operation of moving the push ring 3 in the direction of the joint pipe body 2, and a packing ring 5 compressed by the pressing force of the push ring 3 moved by the operation of the tightener 4. The packing ring 5 includes a basal portion 51 inserted into the depth of the housing portion 20, a seal 52 housed in the front side of the housing portion 20, and a coupling section 53 which couples the basal portion 51 and the seal 52 together and is formed with a cutout groove 54 in its periphery. When a pressing force of the push ring 3 is allowed to act on the packing ring 5 positioned by inserting the basal portion 51 into the depth of the housing portion 20, the seal 52 collapses into the cutout groove 54 to deform, so that a hermetically sealed condition can be obtained by the compression resulting from the deformation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe joint used for joining water pipes, a packing ring used for the pipe joint, and a method of assembling the pipe joint.

  FIG. 9 is a cross-sectional view showing a main part of a conventional pipe joint. This pipe joint 30 water-tightly joins a joining pipe 31 and a joining pipe (not shown) joined to the joining pipe 31. The space is sealed with a compressed packing ring 35. The pusher wheel 33 is connected to the flange of the pipe joint main body 32 by a fastener 34 made of bolts and nuts. A lock ring 36 divided in one circumferential direction is accommodated on the inner peripheral side of the push ring 33, and a piece ring 37 is interposed between the lock ring 36 and the packing ring 35.

  At the time of construction, from the assembled state as shown in FIG. 10, the fasteners 34 are operated to move the pusher wheel 33 close to the pipe joint body 32, and the packing ring 35 is accommodated in the housing part 32 a of the pipe joint body 32 by pressing the pusher wheel 33. Press fit into. The packing ring 35 has a seal portion 35a having a circular cross section as shown in FIG. 11, a base portion 35b having a rectangular cross section, and a protruding piece-like lip portion 35c. The portion 35a is press-fitted, and the base portion 35b is disposed on the front side thereof. The seal portion 35a is larger than the back side of the accommodating portion 32a, and the compressed seal portion 35a is mainly in close contact with the joining tube 31.

  By the way, in the pipe joint having such a structure, since the packing ring 35 is compressed while being moved in the pipe axis direction, there is a problem that the bonding pipe 31 is pulled in at the same time that the packing ring 35 is press-fitted into the accommodating portion 32a. . 9, in the sealed state shown in FIG. 9, the joining tube 31 is displaced by a distance L from the state shown in FIG. 10, and the amount of insertion is changed. For this reason, when assembling the pipe joint, it is necessary to take measures such as setting a small initial insertion amount in anticipation of pulling of the joining pipe.

  The pipe joint described in Patent Document 1 below has a packing ring in which the minimum inner diameter when not pressed is set larger than the outer diameter of the bonded pipe. However, in order to obtain a sealed state by assembling this pipe joint, it is necessary to compress the packing ring while moving it in the direction of the pipe axis by pressing the pressing ring, as in the conventional case, so that there is a risk that the joining pipe will also be drawn. there were.

  When such pulling of the joining pipe occurs, the insertion resistance of the joining pipe increases, so that deterioration of workability is inevitable. Further, in order to improve the workability, it is obviously advantageous to be able to seal with a packing ring while maintaining the initial insertion amount of the joining pipe, and for this purpose, a technique that can prevent the joining pipe from being pulled in is strongly desired.

Japanese Patent No. 4144675

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pipe joint capable of preventing the joining pipe from being pulled in at the time of assembly, a packing ring used therefor, and a method for assembling the pipe joint. It is to provide.

  The above object can be achieved by the present invention as described below. That is, the pipe joint according to the present invention has a push ring externally fitted to the joint pipe, and a housing or pipe joint into which the joint pipe is inserted through the housing section. A pipe joint comprising: a main body; a tightening tool capable of moving the push ring in the direction of the pipe or the pipe joint main body; and a packing ring compressed in accordance with pressing of the push wheel moved by the operation of the tightening tool The packing ring connects a base portion fitted on the back side of the housing portion, a seal portion housed on the front side of the housing portion, the base portion and the seal portion, and is cut out on the outer peripheral side. When the pressing force of the push ring is applied to the packing ring that is positioned by fitting the base portion to the back side of the housing portion, the seal portion is formed into the notch groove. By falling and deforming, due to compression accompanying the deformation Those constructed as sealing state is obtained.

  In the above-described pipe joint, the seal portion can be deformed by pressing the push ring from the state where the packing ring is positioned, and a sealed state can be obtained by compression accompanying the deformation. Therefore, the packing ring is not compressed while being moved in the pipe axis direction, and the joining pipe is not drawn when the pipe joint is assembled. A notch groove is formed on the outer periphery of the packing ring, and when the press ring is pressed, the seal part falls into the notch groove and deforms, and the seal part and connecting part that are strongly compressed on the inner periphery side are connected to the joint pipe. In close contact. Thus, while positioning the packing ring on the back side of the housing part, the packing ring is in close contact with the outer peripheral surface of the joining pipe on the front side of the housing part, and a sealed state by compression of the packing ring can be obtained smoothly. .

  In the pipe joint of the present invention, it is preferable that the seal portion has a circular cross section when the packing ring is in an uncompressed state, and the back side surface of the seal portion is continuously connected to the groove bottom surface of the notch groove. According to such a configuration, when the pressure of the press ring is applied to the packing ring, the seal portion falls into the notch groove and is easily deformed. As a result, the seal portion can be smoothly deformed from the state in which the packing ring is positioned, and the sealed state can be obtained more reliably.

  In the pipe joint according to the present invention, a piece ring having a flange protruding toward the packing ring is interposed between the push ring and the packing ring, and the flange is a pipe shaft at an outer peripheral side portion of the seal portion. What pushes from a direction is preferable. In such a configuration, the pressing of the pressing wheel accurately acts on the outer peripheral side portion of the sealing portion via the piece wheel from the tube axis direction, so that the sealing portion can be efficiently fallen into the notch groove. As a result, the seal portion can be smoothly deformed from the state in which the packing ring is positioned, and the sealed state can be obtained more reliably. In addition, it is not necessary to directly press the packing ring with the press ring, and the shape of the press ring is not restricted, so that the existing press ring can be used and it is economical.

  In the pipe joint of the present invention, the base portion is fitted to the back side of the housing portion, the packing ring is positioned, and the seal portion is in an undeformed state, so that the minimum inner diameter of the packing ring is that of the joining pipe. Those larger than the outer diameter are preferred. According to such a configuration, the joining pipe can be smoothly inserted into the pipe or the pipe joint body through the housing portion from the state where the packing ring is positioned with respect to the housing portion. In addition, when the press ring and the packing ring are temporarily assembled on the pipe or the pipe joint main body, the joining pipe can be smoothly inserted into the temporary assembly.

  In the pipe joint of the present invention, it is preferable that the base portion is formed of a material harder than the seal portion. With such a configuration, the compression in the tube axis direction at the base portion can be suppressed, so that it is easy to prevent the joining tube from being pulled in, and the pressing force of the push wheel can be preferentially applied to the seal portion. Further, since the seal portion becomes relatively soft, the seal portion is easily deformed to improve the adhesion with the joining pipe, and the sealing performance by the packing ring is enhanced.

  Further, the packing ring according to the present invention is a packing ring for sealing between a pipe into which a joining pipe is inserted or a housing part of a pipe joint main body and an outer peripheral surface of the joining pipe, on the back side of the housing part. A tube shaft having a base portion that can be fitted, a seal portion that can be accommodated on the front side of the accommodation portion, a connection portion that connects the base portion and the seal portion, and is formed with a notch groove on the outer peripheral side; The seal portion pressed from the direction falls into the cutout groove and is formed to be deformable. In the pipe joint using this packing ring, it is possible to prevent the joining pipe from being pulled in when the pipe joint is assembled as described above.

  The pipe joint assembling method according to the present invention is a pipe joint assembling method in which a gap between a pipe into which a joined pipe is inserted or a housing portion of the pipe joint main body and an outer peripheral surface of the joined pipe is sealed with a packing ring. In the first step of fitting a packing ring on the back side of the housing part of the pipe or the pipe joint body, and positioning the packing ring with respect to the housing part, the pipe or the pipe joint body through the housing part A second step of inserting the joining pipe, a third step of moving a push ring fitted to the joining pipe in the direction of the pipe or the pipe joint body, and a rear end of the packing ring by pressing of the push ring And a fourth step of causing the part to fall back and obtaining a sealed state by compression associated with the deformation of the fall.

  In the pipe fitting assembly method described above, the packing ring is positioned relative to the pipe or the fitting body's housing, and the rear end of the packing ring is brought into the back side by pressing the push ring. A sealed state is obtained by compression accompanying deformation. Therefore, the packing ring is not compressed while being moved in the pipe axis direction, and the joining pipe is not drawn when the pipe joint is assembled.

Half sectional view showing an example of a pipe joint according to the present invention Enlarged view of the main part of the pipe joint shown in FIG. Enlarged sectional view of the housing Sectional drawing which shows the temporary assembly state of the pipe joint shown in FIG. Cross section of packing ring The figure explaining deformation of a seal part Half sectional view showing a pipe joint according to another embodiment of the present invention. Sectional drawing which shows the modification of a piece ring Sectional drawing which shows the principal part of the conventional pipe joint Sectional drawing which shows the state in the middle of construction of the pipe joint shown in FIG. Sectional drawing of the packing ring with which the pipe joint shown in FIG. 9 is equipped

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a half sectional view showing an example of a pipe joint according to the present invention, and FIG. 2 is an enlarged view of the main part thereof. The joining pipe 1 is a polyethylene water pipe, but is not limited thereto, and may be a fluid pipe made of another material such as a polyvinyl chloride pipe. FIGS. 1 and 2 show a sealed state after construction in which pipe joints are assembled to the two joining pipes 1 and 1 and are watertight.

  The pipe joint 10 includes a pusher wheel 3 that is externally fitted to the joint pipe 1, and a housing part 20 that increases in diameter toward the pusher wheel 3, and a pipe joint body 2 into which the joint pipe 1 is inserted through the housing part 20. (Hereinafter, sometimes simply referred to as “joint body 2”), a fastener 4 including a T-head bolt 4a and a nut 4b, and a packing ring that seals between the outer peripheral surface of the joint tube 1 and the joint body 2. 5. In this embodiment, a lock ring 6 as a separation preventing member is mounted on the inner peripheral side of the pusher wheel 3, and a piece ring 7 is interposed between the lock ring 6 and the packing ring 5.

  The joint body 2 is disposed between the pair of push wheels 3 and is mounted on the outer periphery of the joining pipe 1 leaving a circumferential gap. The joint body 2 includes flange-like projecting portions 2a at both ends, and is integrally provided with a cylindrical barrel portion 2b that swells like a drum between the projecting portions 2a, and is accommodated on the inner peripheral side of the projecting portion 2a. Part 20. Bolt holes for inserting the T-head bolts 4a are provided in the projecting portion 2a at a plurality of locations (for example, 4 locations) in the circumferential direction. The joint body 2 is made of ductile cast iron, but is not limited thereto, and may be formed of stainless steel or synthetic resin.

  The accommodating portion 20 has a diameter that increases toward the opposite pusher wheel 3, and the packing ring 5 is accommodated therein. As shown in FIG. 3, the accommodating portion 20 of the present embodiment includes a small diameter portion 21 located on the back side in the insertion direction of the joining tube 1 (a direction toward the right side in FIG. 3) and a large diameter located on the near side. The part 22 and the inclined surface part 23 which changed the internal diameter in the taper shape so that they may be continued are provided. A curved wall 21 a is provided at the innermost end of the small diameter portion 21, and the minimum inner diameter of the wall 21 a is set larger than the outer diameter D <b> 1 of the bonded tube 1.

  The pusher wheel 3 has a flange-like projecting portion 3 a that faces the projecting portion 2 a of the joint body 2, and a bolt hole for allowing the T-head bolt 4 a to pass through the projecting portion 3 a. The projecting portion 2 a and the projecting portion 3 a are tightly attached by the head of the T-head bolt 4 a and the nut 4 b, and the joint body 2 and the press ring 3 are firmly tightened by the tightening tool 4. On the inner peripheral side of the pusher wheel 3, a tapered surface 3 b that expands toward the housing portion 20 is formed, and the lock ring 6 is pressed against the inner peripheral side by the tapered surface 3 b.

  The lock ring 6 is made of a material harder than the joining pipe 1, and the outer peripheral face 6 a is formed in a taper shape with substantially the same inclination as the tapered face 3 b, and the inner peripheral face can bite into the outer peripheral face of the joining pipe 1. A blade 6b is provided. The lock ring 6 is divided into one piece in the circumferential direction and can be reduced in diameter by elastic deformation. In a state where no external stress is applied, the maximum outer diameter of the lock ring 6 is larger than the maximum inner diameter of the tapered surface 3b.

  The piece wheel 7 is interposed between the pusher wheel 3 and the packing wheel 5 and transmits the pressing force of the pusher wheel 3 that is moved by the operation of the fastening tool 4 to the packing wheel 5 at the time of construction. The piece ring 7 is a metal product made of, for example, a casting, and is formed in an L-shaped cross section having a flange portion 7 a that protrudes toward the packing ring 5. The flange portion 7a is pressed against the outer peripheral side portion of the rear end portion of the packing ring 5 from the tube axis direction. In this embodiment, the outer diameter is slightly smaller than the inner diameter of the large diameter portion 22, and the housing portion 20 in a sealed state. Is invading.

  FIG. 4 is a cross-sectional view showing a temporarily assembled state of the pipe joint 10, and FIG. 5 is a cross-sectional view of the packing ring 5 in a natural state where external stress such as compression is not applied. The pusher wheel 3 can be moved in the direction of the joint body 2 by the operation of the tightening tool 4, and the packing wheel 5 is compressed as the moving pusher wheel 3 is pressed. That is, the sealed state shown in FIGS. 1 and 2 is obtained by inserting the joining tube 1 into the temporary assembly shown in FIG. 4 and fastening the fastener 4.

  In the temporarily assembled state, since the members such as the packing ring 5 are already combined, the construction time can be significantly reduced. That is, since the joining pipe 1 is inserted into the temporary assembly and the fastening tool 4 is tightened, the assembly can be completed. Therefore, by transporting the temporarily assembled pipe joint 10 to the construction site, The work of attaching the push ring 3 and the fastener 4 can be omitted. Although the packing ring 5 is partially deformed in the sealed state, the relative position of the packing ring 5 with respect to the accommodating portion 20 in the sealed state is not substantially changed from the temporarily assembled state.

  The packing ring 5 connects the base 51 fitted on the back side of the housing part 20, the seal part 52 housed on the front side of the housing part 20, the base part 51 and the seal part 52, and is cut out on the outer peripheral side. And a connecting portion 53 in which a groove 54 is formed. The inner diameter of the packing ring 5 in the natural state is substantially constant, and the outer diameter is the largest at the seal portion 52. The material of the packing ring 5 is not particularly limited as long as it is an elastic body, but is preferably made of rubber, and specifically SBR (styrene butadiene rubber).

  As shown in FIGS. 4 and 5, the base portion 51 has a cross-sectional shape corresponding to the back side of the housing portion 20. That is, the tip of the base 51 has a curved shape along the wall 21 a, and the contour of the outer peripheral surface from the tip to the notch groove 54 is a shape along the inner surfaces of the small diameter portion 21 and the inclined surface portion 23. It has become. Therefore, the base 51 can be fitted to the back side of the accommodating portion 20 as shown in FIG. 4 without being compressed or slightly compressed. In the present embodiment, the base 51 is fitted so as to fill the small diameter portion 21 while slightly protruding from the inclined surface portion 23.

  In the temporarily assembled state, the base 51 is fitted on the back side of the accommodating portion 20, and the seal portion 52 is substantially undeformed. The minimum inner diameter D2 of the packing ring 5 in this state is set to be larger than the outer diameter D1 of the joining pipe 1. Further, the tip of the base portion 51 abuts against the wall 21 a and the outer peripheral surface of the base portion 51 abuts against the inner surface of the small diameter portion 21, whereby the centered packing ring 5 is positioned with respect to the housing portion 20 in the tube axis direction. Is done. Since the cross-sectional shape of the base 51 is made to correspond to the back side of the housing part 20 as described above, the mounting of the base 51 is performed manually without making any work.

  As shown in FIG. 5, when the packing ring 5 is in an uncompressed state, the seal portion 52 has a circular cross section, and the back side surface of the seal portion 52 is continuously connected to the groove bottom surface of the notch groove 54. The notch groove 54 has a round U-shaped cross section as a whole, and has a groove bottom surface that is curved so as to be convex toward the inner peripheral side. The radius of curvature of the groove bottom is, for example, about 2.5 mm. In the temporarily assembled state, the seal portion 52 slightly protrudes from the storage portion 20 and is stored in the large diameter portion 22. The outer diameter of the seal portion 52 is set to be substantially the same as the inner diameter of the large diameter portion 22, and the seal portion 52 is stably arranged without wobbling.

  In the temporarily assembled state, the packing ring 5, the lock ring 6, and the piece ring 7 are sandwiched between the joint body 2 and the push ring 3, and the positions thereof are fixed in the pipe axis direction and the pipe radial direction. The flange portion 7 a of the piece ring 7 is pressed against the outer peripheral side portion of the seal portion 52 from the tube axis direction, but a pressing force that deforms the seal portion 52 is not acting. Also, the lock ring 6 is not applied with a pressing force to reduce the diameter, and is mounted in a state of protruding from the tapered surface 3b.

  The pipe joint 10 can be assembled by the following procedure, for example. First, as in the temporarily assembled state shown in FIG. 4, the packing ring 5 is fitted on the back side of the housing part 20, and the packing ring 5 is positioned with respect to the housing part 20 (first step). . Next, the joining pipe 1 is inserted into the joint body 2 through the accommodating portion 20 (second step). At this time, if the inner diameter D2 of the packing ring 5 is larger than the outer diameter D1 of the joining pipe 1, the joining pipe 1 can be smoothly inserted without resistance. In the present invention, since the initial insertion amount can be maintained by preventing the joining tube 1 from being pulled in, the joining tube 1 may be inserted by a required amount.

  Subsequently, the pusher wheel 3 is moved in the direction of the joint body 2 by a tightening operation of the tightening tool 4 (third step). With the pressing of the moving pusher wheel 3, the piece wheel 7 moves close to the housing portion 20, and the pressing force is transmitted to the packing wheel 5. However, since the packing ring 5 is already fitted in the back side of the accommodating part 20, it does not move to a pipe-axis direction. When the press ring 3 moves, the seal portion 52 which is the rear end portion of the packing ring 5 falls down on the back side by the press of the press ring 3, and a sealed state as shown in FIG. 2 is obtained by the compression accompanying the deformation of the fall down ( Fourth step).

  If the pipe joint 10 is not provisionally assembled, the order of the first step and the second step may be reversed, or they may be executed at the same time. Also, when the third step is started, it is possible that the fourth step is started at the same time.

  As described above, the seal ring 52 is deformed by applying the pressing force of the push ring 3 from the state in which the packing ring 5 is positioned by fitting the base portion 51 to the back side of the housing portion 20, and accompanying the deformation. It is comprised so that a sealing state may be obtained by compression. The deformation | transformation of this seal part 52 is demonstrated using FIG. In FIG. 6, only the joining pipe 1, the joint body 2, the packing ring 5, and the piece ring 7 are illustrated, and other members are not illustrated.

  As the push ring 3 is pressed, the piece ring 7 moves close to the housing part 20 (arrow A), and the flange part 7a presses the seal part 52. The seal portion 52 falls into the adjacent notch groove 54 and deforms (arrow B), and is pushed into the accommodating portion 20. The cutout groove 54 opened to the outer peripheral side is filled with the pushed-down seal portion 52, and the seal portion 52 and the connecting portion 53 of the packing ring 5 are strongly compressed toward the inner peripheral side (arrow C). As a result, as shown in FIG. 2, the rear end portion of the packing ring 5 is locally compressed and brought into close contact with the outer peripheral surface of the joining tube 1, and the space between the joining tube 1 and the accommodating portion 20 is sealed.

  As described above, in the present invention, the packing ring 5 is not compressed while being moved in the pipe axis direction, and therefore the joining pipe 1 can be prevented from being pulled in when the pipe joint 10 is assembled. The seal portion 52 has a circular cross section, and the back side surface of the seal portion 52 is smoothly connected to the groove bottom surface of the notch groove 54. The flange portion 7a of the piece ring 7 is connected to the outer peripheral side portion of the seal portion 52 on the tube shaft. Both the pressing from the direction and the notch groove 54 has a rounded cross-sectional U-shape, and has a groove bottom surface that is curved so as to protrude toward the inner peripheral side. This is advantageous in order to develop such deformation of the seal portion 52.

  The depth and volume of the notch groove 54 are not particularly limited as long as the deformation of the seal portion 52 as described above is exhibited. However, the ratio Hb / Ha of the minimum height Hb of the connecting portion 53 with respect to the maximum height Ha of the seal portion 52 with reference to the inner peripheral surface of the packing ring 5 from the viewpoint of causing the seal portion 52 to fall down smoothly (FIG. 5). Is preferably 0.2 to 0.5. Specifically, an example in which Ha is set to 13 to 14 mm, Hb is set to 4 to 5 mm, and Hb / Ha is set to 0.28 to 0.38 is exemplified.

  In the packing ring 5, it is preferable that the material of the base portion 51 is harder than the seal portion 52. In that case, compression in the tube axis direction at the base 51 is suppressed, and it becomes easy to prevent the joining tube 1 from being pulled in, and the pressing force of the pusher wheel 3 is preferentially applied to the seal portion 52. Further, since the seal portion 52 is soft, it is easily deformed to improve the adhesion with the joining tube 1 and the sealing performance by the packing ring 5 is enhanced. Examples of rubber hardness (measured value of JISK6253 type A durometer) are those in which the base 51 is 70 ± 5 ° and the seal 52 is 55 ± 5 °.

  After the packing ring 5 is compressed to a certain extent, when the pusher wheel 3 is further moved in the direction of the joint body 2, the lock ring 6 is pushed into the tapered surface 3b as the pusher wheel 3 is pressed, and the diameter of the ring is reduced. To do. As a result, the blade 6b is able to bite into the outer peripheral surface of the joining pipe 1, and the joining pipe 1 can be prevented from coming off from the joint body 2.

[Other Embodiments]
(1) In the above-described embodiment, an example of a pipe joint that is joined with a pipe joint body interposed between two joint pipes is shown. However, in the present invention, as shown in FIG. Instead, a pipe 8 connected to the joining pipe 1 may be used. A receiving portion 80 whose diameter increases toward the push wheel 3 is provided at the receiving port of the tube 8, and the joining tube 1 is inserted through the receiving portion 80.

  (2) The shape of the packing ring is not limited to that shown in the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention. For example, the seal portion may be made slightly larger than the large diameter portion, or conversely slightly smaller.

  (3) In the above-described embodiment, an example in which the piece wheel 7 has an L-shaped cross section is shown. However, as shown in FIG. Variations having a letter shape are also conceivable. According to this configuration, after the sealing by the packing ring 5 is completed, the protrusion 7 b of the piece ring 7 is brought into contact with the end surface of the joint body 2 in the stage of further moving the push ring 3 to reduce the diameter of the lock ring 6. Further, excessive pushing of the packing ring 5 can be surely prevented.

  (4) In the above-described embodiment, an example in which the piece ring is interposed between the press ring and the packing ring is shown. However, the packing ring may be directly pressed by the press ring without using the piece ring. Even in such a case, it is preferable that the outer peripheral side portion of the seal portion is intensively pressed so that the seal portion easily falls to the back side.

  (5) The joining pipe used in the present invention is not limited to a water pipe, and may be a fluid pipe used for fluids such as various liquids and gases other than water.

DESCRIPTION OF SYMBOLS 1 Joining pipe 2 Pipe joint main body 3 Push ring 4 Fastening fastener 5 Packing ring 6 Lock ring 7 Piece ring 7a collar 10 Pipe joint 20 Housing part 51 Base 52 Seal part 53 Connection part 54 Notch groove

Claims (7)

A press ring fitted to the joint pipe,
A pipe or a pipe joint body into which the joining pipe is inserted through the housing part, the housing part having a diameter expanding toward the push ring;
A fastener capable of moving the push ring in the direction of the pipe or the fitting body;
In a pipe joint provided with a packing ring that is compressed in accordance with the pressing of the push ring that moves by the operation of the fastener,
The packing ring connects a base portion fitted on the back side of the housing portion, a seal portion housed on the front side of the housing portion, the base portion and the seal portion, and a notch groove on the outer peripheral side. A formed connecting portion,
When the pressing ring is pressed against the packing ring positioned by fitting the base portion to the back side of the housing portion, the seal portion falls into the notch groove and is deformed, and compression due to the deformation is caused. A pipe joint characterized in that a sealed state is obtained.   2. The pipe joint according to claim 1, wherein the seal portion has a circular cross section when the packing ring is in an uncompressed state, and a back side surface of the seal portion is smoothly connected to a groove bottom surface of the notch groove.   2. A piece ring having a flange protruding toward the packing ring is interposed between the press ring and the packing ring, and the flange presses against an outer peripheral side portion of the seal portion from the tube axis direction. Or the pipe joint of 2.   The minimum inner diameter of the packing ring is larger than the outer diameter of the joining pipe when the base is fitted to the back side of the housing portion to position the packing ring and the seal portion is undeformed. The pipe joint of any one of 1-3.   The pipe joint according to any one of claims 1 to 4, wherein the base portion is formed of a material harder than the seal portion. In a packing ring for sealing between a pipe into which a joined pipe is inserted or a housing portion of a pipe joint main body and an outer peripheral surface of the joined pipe,
A base portion that can be fitted to the back side of the housing portion, a seal portion that can be housed on the front side of the housing portion, and a connecting portion that connects the base portion and the seal portion and has a notch groove formed on the outer peripheral side. The packing ring is characterized in that the seal portion pressed from the tube axis direction falls into the notch groove and is deformable. In a method for assembling a pipe joint in which a space between a pipe into which a joint pipe is inserted or a housing portion of a pipe joint main body and an outer peripheral surface of the joint pipe is sealed with a packing ring
A first step of fitting a packing ring on the back side of the housing part of the pipe or the pipe joint body, and positioning the packing ring with respect to the housing part;
A second step of inserting a joining pipe through the housing portion into the pipe or pipe joint body;
A third step of moving a push ring fitted to the joint pipe in the direction of the pipe or the pipe joint body;
And a fourth step of causing the rear end of the packing ring to fall back by pressing the push ring and obtaining a sealed state by compression associated with the deformation of the fall. Method.

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