JP2005036932A - Pipe joint, packing ring, and packing ring unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint capable of simplifying an assembling process and reducing its costs. <P>SOLUTION: The pipe joint comprises a push ring 13 inserting onto the outer periphery of a joined pipe 11 at one end side, a joint body 12 having a projecting section 12a opposite to a projecting section 13a at a side opposite to the push ring 13, a bolt 14 capable of moving the push ring 13 toward the direction of the joint body 12, a packing ring 15 arranged between the joint body 12 and the jointed pipe 11, and a locking ring 16 preventing separation of the jointed pipe 11 from the joint body 12. The push ring 13 has the projecting section 13a on the outer periphery. The joint body 12 has a socket 12c expanding toward the push ring 13 at an inner peripheral side of the projecting section 12a, and is inserted through a peripheral gap on an outer periphery of the joined pipe 11. The packing ring 15 is inserted into the socket 12c by means of elastic deformation caused by pressed force of the push ring 13 moved with operation of the bolt 14. A housing 15g housing the stop ring 16, which comes in contact with the jointed pipe 11 of the packing ring 15 at its inner face side, is arranged on the pipe joint. Upon operating the bolt 14, the packing ring 15 is inserted into the socket 12c, and is also firmly stuck on the outer periphery of the joined pipe 11 by shrinking the inner diameter of the stop ring 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a metal or resin pipe joint used for a water pipe or the like, a packing ring and a packing ring unit used therefor.

  As such a pipe joint, a spacerless pipe joint disclosed in Patent Document 1 below is known. This will be described with reference to FIG. 12 (overall view) and FIGS. 13 to 15 (partial views). In FIG. 12, the pipe joint is a watertight connection between the metal or resin joint pipes 1 and 1, and comprises a joint body 2 and a pair of push wheels 3 and 3, which are T-type bolts and nuts. Tighten with tools 4 and 4. The joint body 2 includes flange-like projecting portions 2a and 2a that are opposed to each other, and is integrally provided with a cylindrical barrel portion 2b that swells like a drum between the projecting portions 2a and 2a. Has a receiving portion 2c. The pusher wheel 3 is also provided with a flange-like protruding portion 3a, the joint body 2 is positioned on the outer periphery between the joining pipes 1 and 1, leaving a circumferential gap, and the pusher wheels 3 and 3 are disposed at both ends thereof. Rubber packing rings 5, 5 are set between the main body 2 and each pusher wheel 3, and are tightened with fasteners 4, 4. Then, by tightening the fastener 4, the rubber packing ring 5 is pushed by the tip 3b of the pusher wheel 3 and is joined to the receiving port 2c in a wedge shape, and is crimped to the outer peripheral surface of the joining tube 1. The joining pipes 1 and 1 are connected so that the liquid passing through the pipes 1 and 1 does not leak to the outside.

  Each protrusion 2a integrally formed on the outer periphery of the joint body 2 is provided with bolt holes as many as the number of fasteners 4 (for example, four) in the circumferential direction. Moreover, in the receptacle part 2c formed so that it might expand toward the push ring 3 side at the both ends of the coupling main body 2, as shown in FIG. 13, for example, the press-fit part which is a cylinder surface parallel to the joining pipe | tube 1 in the constriction side. 2d is formed, and a receiving hole portion 2e which is a cylindrical surface parallel to the bonding tube 1 is formed on the side to be expanded.

  Also in each protrusion 3a integrally formed on the outer periphery of the presser wheel 3, bolt holes are provided in positions corresponding to the bolt holes on the joint body 2 side in the circumferential direction by the number of fasteners 4 (for example, four). A tightening tool 4 made of a T-shaped bolt / nut is inserted through the bolt hole of the pusher wheel 3 and the joint body 2 so that it can be tightened. A retaining ring 6 (a retaining ring) is provided on the inner periphery of the pusher wheel 3. As shown in FIG. 12, the pusher wheel 3 is separated at one place in the circumferential direction and has a structure that can be tightened by the fastening tool 7.

  Further, the rubber packing ring 5 is provided between the joint body 2 and the joint pipe 1 by the elastic deformation caused by the direct pressing by the distal end portion 3b of the moving pusher wheel 3 by the operation of the tightening tool 4. It is fitted to the receiving part 2c. As shown in FIGS. 13 to 15, the rubber packing ring 5 includes a tip portion 5 a on the receiving portion 2 c side and a base portion 5 b on the push ring 3 side. As shown in FIG. 13, the tip portion 5 a has an outer periphery. Is substantially the same diameter as the inner diameter of the receiving portion 2c, so that the outer periphery of the base portion 5b is connected to the front portion 5a. The stopper 5c has a diameter larger than the outer diameter of the tip 5a and abuts against the outer peripheral surface 2f of the receiving port periphery.

  The inner circumference of the packing ring 5 is naturally larger than the outer circumference of the joining pipe 1 in its natural state, and the combination of the joint body 2, the packing ring 5 and the press ring 3 assembled in advance is transported to the construction site. In addition, the work of attaching the joining pipe 1 to these combinations is easy, and the packing ring 5 is press-fitted into the receiving portion 2c without excessive resistance.

  In the base portion 5b of the packing ring 5, for example, as shown in FIG. 13, an outer peripheral side fin portion 5e protruding toward the press wheel side is formed over the entire periphery of the press wheel side outer peripheral edge, and the inner periphery of the outer peripheral side fin portion 5e is The outer diameter of the front end portion of the press wheel 3 is approximately the same. As a result, the pusher wheel 3 that contacts the end face on the pusher wheel 3 side of the base part 5b of the packing wheel 5 comes to be fitted tightly inside the outer peripheral fin part 5e, and the radial positioning of the pusher wheel 3 and the packing wheel 5 can be performed. It will be done automatically.

  On the other hand, a recess 5f is formed on the side of the stopper 5c that contacts the receiving portion 2c of the base portion 5b, and is caught on the edge of the receiving hole portion 2e that is the opening of the receiving portion 2c and on the opposite side to the traveling direction. The stopper can smoothly enter the receiving portion 2c while elastically deforming so as to warp.

  In the case of this spacerless type pipe joint, in the temporarily assembled state, as shown in FIG. 13, the stopper 5c of the base part 5b of the rubber packing ring 5 is brought into contact with the outer peripheral surface 2f of the receiving part periphery of the joint body 2. The tip 5 a of the packing ring 5 is temporarily fixed to the receiving hole 2 e that is the inlet of the receiving port 2 c, and the tip 3 b of the push ring 3 that moves by the operation of the fastener 4 is attached to the packing ring 5. The outer periphery 5e of the base 5b is fitted tightly and is in contact with the end surface of the pusher wheel 3 side.

  In the temporarily assembled pipe joint, the front part 5a of the packing ring 5 is the inlet of the receiving part 2c so that the stopper 5c of the base part 5b of the packing ring 5 contacts the outer peripheral surface 2f of the receiving part peripheral edge of the joint body 2. The work of assembling the packing ring 5 to the spacer is not required just by temporarily fixing it to the receiving hole 2e, and the packing ring 5 is positioned in the radial direction by the tip 5a inserted into the receiving hole 2e. As a result, the packing ring 5 is positioned in the axial direction by the stopper 5c that comes into contact with the outer peripheral surface 2f of the receiving portion peripheral edge of the joint body 2.

  When the pusher wheel 3 is moved by operating the fastener 4 with the joint pipes 1 and 1 inserted into the temporarily assembled pipe joint after being transported to the site, the pusher wheel 3 is moved as shown in FIG. With the direct pressing, the packing ring 5 starts to enter the receiving portion 2c deeply while elastically deforming itself including the stopper 5c. After that, as shown in FIG. 15, the pusher wheel 3 abuts against the protruding part 2 a of the joint body 2, and the packing ring 5 is tightly coupled to the press-fitting part 2 d of the receiving part 2 c in a wedge shape and By pressure bonding, the packing ring 5 is fitted, and the joining pipes 1 and 1 are connected so that the liquid passing through the joining pipes 1 and 1 does not leak to the outside.

Further, the retaining ring 6 is formed in a C-shaped ring, and the retaining ring 6 is reduced in diameter by tightening the push ring 3 with the fastening tool 7. Thereby, the retaining ring 6 can be bitten on the outer peripheral surface of the joining pipes 1 and 1. Therefore, even if the force which makes the joining pipes 1 and 1 separate from the joint main body 2 acts with water pressure, the joining pipes 1 and 1 can be prevented from coming out from the joint main body 2.
JP 2003-42359 A

  The problems of the pipe joint described above are as follows. That is, the process of fitting the packing ring 5 into the receiving part 2c and the process of mounting the retaining ring 6 in the push ring 3 are necessary, and the work of assembling the pipe joint is complicated. Further, it is necessary to form a housing portion for housing the retaining ring 6 inside the push ring 3 and to have a structure for reducing the diameter, which complicates the shape of the push wheel 3 and causes an increase in cost.

  The present invention has been made in view of the above circumstances, and its object is to provide a pipe joint that can simplify the process of assembling the pipe joint and reduce the cost, and a packing ring and a packing ring unit used therefor. That is.

In order to solve the above problems, the pipe joint according to the present invention is
A press ring that has a protruding portion on the outer periphery and is fitted on the outer periphery on one end side of the joining pipe,
It has a projecting portion facing the projecting portion on the side facing the press ring, and a receiving portion that extends toward the press wheel on the inner peripheral side of the projecting portion, and is fitted with a circumferential gap on the outer periphery of the joining pipe A pipe or a fitting body,
A fastener capable of moving the push ring in the direction of the pipe or the joint body;
A packing ring that is provided between the pipe or the joint main body and the joint pipe and is fitted to the receiving part by its own elastic deformation caused by direct pressing by the pressing wheel that moves by operation of the fastener. When,
A pipe joint comprising a retaining ring for preventing the joining pipe from being detached from the pipe or the joint body,
An accommodation portion for accommodating the retaining ring is provided on the inner surface side of the packing ring that contacts the joining pipe, and the packing ring and the retaining ring are fitted to the receiving portion by operation of the tightening tool. The inner diameter of the retaining ring is reduced so as to be in close contact with the outer periphery of the joining pipe.

  The operation and effect of the pipe joint with this configuration is as follows. This pipe joint includes a push ring, a joint body (or pipe), a tightening tool, a packing ring, and a retaining ring. The pusher wheel has a protrusion on the outer periphery thereof, and is fitted on the outer periphery on one end side of the joining pipe. The joint body (or pipe) has a protruding portion that faces the protruding portion of the push ring. The projecting portion has a receiving portion on the inner peripheral side, and has a shape that widens toward the press ring. The joint body (or pipe) is fitted around the outer circumference of the joint pipe with a circumferential gap. The tightening tool has a function of moving the push ring in the direction of the joint body (or pipe). The packing ring is provided between the inside and outside of the joint body (or pipe) and the joining pipe. The packing ring is fitted into the receiving portion by operating the tightening tool. At this time, since the packing ring is fitted into the receiving portion by its own elastic deformation, the joining pipe and the joining pipe can be tightly connected.

  Further, a housing portion that houses the retaining ring is provided on the side of the packing ring that comes into contact with the joining tube, and the retaining ring can be housed in the housing portion. Then, the retaining ring can be fitted together by fitting the packing ring into the receiving part by operating the tightening tool. By the operation by the tightening tool, the packing ring is elastically deformed to be fitted into the receiving portion, and the retaining ring is inserted with its inner diameter reduced. As a result, the retaining ring can be brought into close contact with the outer periphery of the joining pipe, and can function as a retaining member.

  As described above, since the packing ring and the retaining ring can be simultaneously inserted into the receiving portion by operating the tightening tool, the process can be simplified. Moreover, since the accommodating part which accommodates a retaining ring is provided in the packing ring, it is not necessary to accommodate the retaining ring in the push ring. Therefore, the shape of the push wheel can be simplified. Moreover, the process of reducing the diameter of the press ring by the fastening device as in the prior art becomes unnecessary. As a result, it is possible to provide a pipe joint that can simplify the process of assembling the pipe joint and reduce the cost.

  As a preferred embodiment of the present invention, in the natural state, an inner diameter of the retaining ring is set to be larger than an inner diameter of the packing ring.

  When the packing ring is mounted around the joint pipe, the retaining ring is accommodated in the packing ring. At this time, if the inner diameter of the retaining ring is smaller than the inner diameter of the packing ring, the metallic retaining ring is usually rubbed against the outer peripheral surface of the joining pipe, and the packing ring cannot be mounted smoothly. Therefore, the inner diameter of the retaining ring is made larger than the inner diameter of the packing ring so that the packing ring can be easily attached.

  As a preferred embodiment of the present invention, when the retaining ring is accommodated in the accommodating portion, the retaining ring is accommodated via a protective member for preventing the packing ring from being scratched by the retaining ring. It is done.

  The packing ring is made of a flexible material such as rubber, and the retaining ring is made of a hard material such as metal. Therefore, when the retaining ring tries to move due to the internal pressure, the packing ring may be damaged and the function of the packing ring may be deteriorated. Therefore, when the retaining ring is accommodated, the packing ring can be protected from being damaged by being accommodated via the protective member.

  As another preferred embodiment of the present invention, the protective member is formed in a ring shape, and a slit along the tube axis direction of the joint pipe is provided so that the inner diameter is easily reduced by the operation of the fastener. What is formed.

  When the packing ring is fitted into the receiving portion, the packing ring is elastically deformed, so that the protection member needs to have a shape that can be easily deformed. When the protective member is formed in a ring shape, it can be easily deformed by forming a slit along the tube axis direction.

  As still another preferred embodiment of the present invention, the protective member includes a space in which the retaining ring is movable along the tube axis direction of the joint pipe.

  By forming a space in which the retaining ring can move in the protective member, it is possible to prevent the packing ring from being damaged due to the retaining ring trying to move.

  As still another preferred embodiment of the present invention, the protective member is made of a material that is softer than the retaining ring and harder than the packing ring.

  By setting the hardness of the protective member as described above, the protective member can be inserted into the receiving portion while being deformed, and the packing ring can be appropriately protected.

  As still another preferred embodiment of the present invention, the retaining ring is formed in a substantially C shape in which a part in the outer peripheral direction is cut, and is in contact with the packing ring or the protective member at the cut portion. What is formed so that the shape of the outer diameter side to be smoothed can be mentioned.

  By forming the retaining ring in a substantially C shape, the diameter can be easily reduced. In this case, if the shape of the cut portion is sharp, the inner surface of the packing ring or the protective member is damaged when the retaining ring tries to move. Therefore, by making the shape of the cut portion (outer diameter side) smooth, it is possible to prevent such damage.

In order to solve the above problems, the packing ring used in the pipe joint according to the present invention is:
A housing portion for housing the retaining ring is provided on the inner surface side that comes into contact with the joining pipe, and is fitted into the receiving portion by operating the tightening tool.

  Moreover, the packing ring unit according to the present invention is characterized in that a retaining ring is accommodated in the accommodating portion of the packing ring according to the present invention.

  As a preferred embodiment of the packing ring unit according to the present invention, there is one in which the retaining ring is accommodated in the accommodating portion via the protective member according to the present invention.

  The operations and effects of the packing ring and the packing ring unit are as described above.

  A preferred embodiment of a pipe joint and packing ring according to the present invention will be described with reference to the drawings. FIG. 1 is a half sectional view showing a construction state of a pipe joint. FIG. 2 is a front view showing a rubber packing ring of the pipe joint shown in FIG. 3 is a cross-sectional view taken along the line AA of the rubber packing ring shown in FIG. FIG. 4 is a front view showing the retaining ring shown in FIG. FIG. 5 is a partial cross-sectional view showing a temporarily assembled state of the pipe joint shown in FIG. 6 and 7 are partial cross-sectional views showing a situation during construction of the pipe joint of FIG. In addition, the fastener is abbreviate | omitted in FIGS.

  The pipe joint shown in FIG. 1 is a watertight joint between metal or resin joint pipes 11 and 11, and includes a joint main body 12 and a pair of push wheels 13 and 13, which are T-shaped bolts and nuts. The fasteners 14 and 14 are used for tightening. The joint body 12 includes flange-like projecting portions 12a and 12a that are opposed to each other, and is integrally provided with a cylindrical barrel portion 12b that swells like a drum between the projecting portions 12a and 12a, and an inner periphery of the projecting portion 12a. Has a receiving portion 12c. The pusher wheel 13 is also provided with a flange-like protrusion 13a so that the joint body 12 is positioned on the outer periphery between the joining pipes 11 and 11, leaving a circumferential gap, and the pusher wheels 13 and 13 are disposed at both ends thereof. Rubber packing rings 15, 15 are set between the main body 12 and the respective push wheels 13, and are tightened with the fasteners 14, 14. By tightening the fastener 14, the rubber packing ring 15 is pushed by the tip portion 13b of the pusher wheel 13 and coupled to the receiving portion 12c in a wedge shape, and is crimped to the outer peripheral surface of the joining tube 11, and the joining tube The joining pipes 11 and 11 are connected so that the liquid passing through the pipes 11 and 11 does not leak to the outside. Hereinafter, the structure of each part of this pipe joint is demonstrated concretely.

  Each protrusion 12a integrally formed on the outer periphery of the joint body 12 is provided with the same number of bolt holes as the number of fasteners 14 (for example, four) in the circumferential direction. Further, in the receiving portion 12c formed so as to expand toward the push wheel 13 at both ends of the joint body 12, as shown in FIG. 5, for example, a press-fit portion that is a cylindrical surface parallel to the joining tube 1 on the narrowed side. 12d is formed, and a receiving hole portion 2e which is a cylindrical surface parallel to the joining tube 1 is formed on the expanding side.

  Also in each protrusion 13a integrally formed on the outer periphery of the press ring 13, bolt holes are provided at positions corresponding to the bolt holes on the joint body 12 side in the circumferential direction by the number of fasteners 14 (for example, four). A tightening tool 14 made of a T-shaped bolt and nut is inserted through the pusher wheel 13 and the bolt through hole of the joint body 12 so as to be tightened.

  Further, as an example, a rubber packing ring 15 made of SBR (styrene butadiene rubber) or the like is provided between the joint main body 12 and the joint pipe 11 by the front end 13b of the push ring 13 which is moved by operating the tightening tool 14. It is fitted into the receiving portion 12c by its own elastic deformation caused by direct pressing. As shown in FIGS. 2 and 3, the rubber packing ring 15 includes a tip portion 15a on the receiving portion 12c side and a base portion 15b on the push wheel 13 side. As shown in FIG. The outer periphery is substantially the same as the inner diameter of the receiving portion 12c so that the receiving hole portion 12e, which is the inlet of the receiving portion 12c, can be temporarily fixed, while the base portion 15b has an outer periphery only where it is connected to the front portion 15a. Is larger than the outer diameter of the tip portion 15a, and serves as a stopper 15c that comes into contact with the outer peripheral surface 12f of the receiving portion periphery. In addition, in FIG. 2, the right half shows the state seen from the front side, and the left half shows the state seen from the base side.

  In the case of this embodiment, the inner periphery of the packing ring 15 is larger in diameter than the outer periphery of the joining pipe 11 in its natural state, and the combination of the joint body 12, the packing ring 15 and the press ring 13 assembled in advance is used. When transporting to a construction site or the like and performing construction, it is easy to attach the joining pipe 11 to these combinations, and the packing ring 15 is press-fitted into the receiving portion 12c without excessive resistance. Further, the tip 15a of the packing ring 15 is a soft part having excellent sealing properties, and the base 15b is a hard part. In addition to the pressure transmitted by the pressing ring 13 being reliably transmitted to the packing ring 15, the packing ring 15 Since the tip portion 15a is excellent in adhesion and pressure-bonding properties, the sealing performance is good.

  Usually, the soft portion as the tip portion 5a is suitable for a hardness HA of about 60 ° ± 5 °, and the hard portion as the base portion 5b is suitable for a hardness HA of 90 ° ± 5 °. Further, the tip portion 15a of the packing ring 15 has a round shape in cross section, and the edge angle of the receiving hole portion 12e is also rounded so that the tip portion 15a can be easily inserted into the receiving hole portion 12e.

  In the base portion 15b of the packing ring 15, for example, as shown in FIG. 5, an outer peripheral side fin portion 15e that protrudes toward the press wheel side is formed over the entire periphery of the press wheel side outer peripheral edge, and the inner periphery of the outer peripheral side fin portion 15e is The outer diameter of the tip end portion of the press wheel 13 is substantially the same. As a result, the pusher wheel 13 that hits the pusher wheel 13 side end surface 15d of the base part 15b of the packing wheel 15 is fitted with the tip part 13b tightly inside the outer peripheral fin part 15e, and the radial positioning of the pusher wheel 13 and the packing wheel 15 is achieved. Will be done automatically.

  On the other hand, a recess 15f is provided on the side of the stopper 15c that contacts the receiving portion 12c of the base portion 15b, and it is caught on the edge of the receiving hole portion 12e that is an opening of the receiving portion 12c and on the side opposite to the traveling direction. The stopper can smoothly enter the receiving portion 12c while elastically deforming so as to warp.

  In addition, the stopper 15c, which is a part of the base portion 15b, has a hardness HA of 90 ° ± 5 ° and an appropriate hardness / elastic deformation property, so that it exhibits a sufficient stopper function and is in a temporarily assembled state. In addition, the stopper 15c is easily deformed when the packing ring 15 enters the receiving portion 12c.

  In the case of the pipe joint of this embodiment, in the temporarily assembled state, as shown in FIG. 5, the stopper 15 c of the base portion 15 b of the rubber packing ring 15 is brought into contact with the outer peripheral surface 12 f of the receiving portion peripheral edge of the joint body 12. The tip 15a of the packing ring 15 is temporarily fixed to the receiving hole 12e that is the inlet of the receiving port 12c, and the tip 13b of the push ring 13 that is moved by the operation of the fastener 14 is The outer peripheral side 15e of the base portion 15b is tightly fitted, and is brought into contact with the end surface of the pusher wheel 13 side.

  In the temporarily assembled pipe joint, the front end 15a of the packing ring 15 is the inlet of the receiving part 12c so that the stopper 15c of the base part 15b of the packing ring 15 contacts the outer peripheral surface 12f of the receiving part peripheral edge of the joint body 12. Only by temporarily fixing to the receiving hole portion 12e, the work of assembling the packing ring 15 to the spacer is not required, and the packing ring 15 is positioned in the radial direction by the tip portion 15a inserted into the receiving hole portion 12e. As a result, the positioning of the packing ring 15 in the axial direction is performed by the stopper 15c that contacts the outer peripheral surface 12f of the receiving portion peripheral edge of the joint body 12, so that the radial and axial positioning of the packing ring 15 is very simple. In addition, since no spacer is used, there is no temporary assembly collapse due to the breakage of the spacer, and even when the pipe joint is transported to the site in the temporary assembly state, the temporary assembly state of the pipe joint is difficult to collapse.

  An accommodating portion 15g is formed between the front portion 15a and the base portion 15b of the packing ring 15 and on the side facing the outer peripheral surface of the bonding tube 11 (the inner surface side in contact with the bonding tube 11). The accommodating portion 15g functions as an accommodating space (accommodating recess) for accommodating the retaining ring 16 (retaining ring). The cross-sectional shape of the retaining ring 16 is substantially circular as shown in FIG. 3, but a biting portion 16 a having a sharp tip is formed on the side facing the joining tube 11. The leading end of the biting portion 16a bites into the outer surface of the joining pipe 11, thereby preventing the joining pipe 11 from moving along the pipe axis direction. That is, the joining pipe 11 is prevented from being detached from the joint body 12. Further, when the inner diameter dimension of the packing ring 15 and the inner diameter dimension of the retaining ring 16 are compared, the inner diameter of the retaining ring 16 is set to be slightly larger in the natural state (before the diameter is reduced). ing. With such a dimensional relationship, the packing ring 15 that accommodates the retaining ring 16 can be smoothly mounted on the outer periphery of the joining tube 11.

  The retaining ring 16 is formed as a C-shaped ring as shown in FIG. 4 when viewed in the tube axis direction. That is, the retaining ring 16 has a cut portion 16b in the circumferential direction. The shape of the cut-off portion 16b on the side of the retaining ring 16 in contact with the packing ring 15 is a smooth shape (shown by a drawing number 16c) as shown in FIG. Further, the vicinity of the cut portion 16 b is prevented from contacting the packing ring 15. When this portion is cut at a sharp angle (see, for example, the drawing number 16c ′ in FIG. 4A, cut perpendicularly to the outer shape), the retaining ring 16 is moved to the inner surface of the packing ring 15 when attempting to move. There is a possibility of scratching. The retaining ring 16 is preferably formed of a metal such as stainless steel in order to ensure its strength. By making the retaining ring 16 C-shaped, it is possible to reduce the diameter by applying a force from the outer peripheral side. Therefore, the inner diameter of the retaining ring 16 is larger than the outer diameter of the bonded tube 11 in the natural state.

<Construction procedure>
Next, the construction procedure of the pipe joint according to this embodiment will be described. After being transported to the site, the joined pipes 11 are inserted into the temporarily assembled pipe joint. The temporarily assembled pipe joint is as shown in FIG. The packing ring 15 is in a state where the retaining ring 16 is also accommodated in advance (this is referred to as a packing ring unit).

  Next, the pusher wheel 13 is moved along the tube axis direction by operating the tightening tool 14. As a result, as shown in FIG. 6, the packing ring 15 starts to enter the interior of the receiving portion 12 c while elastically deforming itself including the stopper 15 c as the pressing ring 13 moves directly. Since the outer diameter of the packing ring 15 is reduced by elastic deformation, the retaining ring 16 accommodated in the accommodating portion 15g is also subjected to the diameter reducing action. Accordingly, the retaining ring 16 is gradually inserted into the receiving portion 12c while the outer diameter is gradually reduced.

  Thereafter, as shown in FIG. 7, the pusher wheel 13 abuts against the protrusion 12a of the joint body 12 (or the pusher wheel 13 moves in the direction of the joint body 12 by a specified distance), and the packing wheel 15 receives the receiving part 12c. The press-fitting portion 12d is tightly coupled in a wedge shape and is also crimped to the outer peripheral surface of the joining pipe 11, so that the packing ring 15 is fitted and joined so that the liquid passing through the joining pipes 11 and 11 does not leak to the outside. Tubes 11 and 11 are spliced. Further, the retaining ring 16 accommodated in the packing ring 15 is further reduced in diameter, and the leading end of the biting portion 16 a bites into the outer peripheral surface of the joining pipes 11, 11. Therefore, even if the water pressure acts and the packing ring 15 is detached from the receiving portion 12c, it cannot be easily moved by the biting action of the retaining ring 16.

  The stopper 15c smoothly enters the receiving portion 12c on the tip side, and the soft tip portion 15a, which is a soft portion, sufficiently adheres to and press-fits to the press-fit portion 12d and the outer peripheral surface of the joining tube 11, so that the sealing performance Is good.

<Another embodiment 1>
Next, another embodiment of the packing ring unit will be described with reference to FIG. When the retaining ring 16 is accommodated in the accommodating portion 15g of the packing ring 15, the protective ring 17 is interposed. The overall shape of the guard ring 17 is shown in FIG. The protective ring 17 is formed with an accommodation recess 17 a corresponding to the cross-sectional shape of the retaining ring 16. As shown in FIG. 9, the protective ring 17 is formed with a large number of slits 17b in the circumferential direction. The slit 17b is formed in a direction along the tube axis direction. By forming the slit 17b, the protective ring 17 can be easily reduced in diameter. In addition, you may form in the C shape which cut | disconnected a part of circumferential direction of the protection ring 17. FIG. The protective ring 17 can be preferably manufactured by resin molding. That is, the protection ring 17 has a higher hardness than the rubber packing ring 15 and a lower hardness than the stainless steel retaining ring 16.

  When the water pressure is applied, the retaining ring 16 tries to move along the tube axis direction. In this case, if the protective ring 17 is not provided, the packing ring 15 may be scratched or cracked. . Therefore, if the protective ring 17 is provided, the inner surface of the packing ring 15 is not scratched by the retaining ring 16 having a high hardness. Since the protection ring 17 is smaller in hardness than the retaining ring 16, damage to the packing ring 15 can be kept low. That is, the protective ring 17 has a function of preventing the retaining ring 16 and the packing ring 15 from coming into direct contact.

  In the case of the packing ring unit shown in FIG. 8, the construction procedure may be the same as that shown in FIGS. When the packing ring 15 is fitted, the retaining ring 16 and the protective ring 17 are simultaneously reduced in diameter so that they are inserted into the receiving portion 12c. The shape of the other parts of the packing ring unit is the same as that already described, and only the figure number is given and the description is omitted.

<Another embodiment 2>
FIG. 10 shows a configuration of a packing ring unit according to another embodiment. In this configuration, a protective ring 18 is provided inside the base portion 15b, and the size thereof is larger than that of the structure shown in FIG. The accommodation space 18a provided in the protective ring 18 is larger than the cross-sectional area of the retaining ring 16, and thereby a space in which the retaining ring 16 can move is secured. That is, the retaining ring 16 is configured to be able to move to the position of the tip end portion 13b of the push wheel 13. The protective ring 18 may be configured such that the retaining ring 16 directly contacts the tip portion 13b. The shape of the other parts of the packing ring unit is the same as that already described, and only the figure number is given and the description is omitted.

  In addition, although it is a protection ring as a protection member, it does not necessarily need to be an integral thing formed in the ring shape. For example, the ring may be divided into a plurality of parts along the circumferential direction (for example, divided into four parts), and the protective member may be configured by the plurality of members. When dividing into a plurality of pieces, it is not necessary to provide a slit as shown in FIG.

  According to the configuration described above, the retaining ring 16 and the protective rings 17 and 18 can be fitted (inserted) into the receiving portion 12 c together with the packing ring 15. That is, the retaining ring and the protection rings 17 and 18 can be unitized with the packing ring 15 in advance. Thereby, the process of assembling the pipe joint can be simplified. Further, in the case where the retaining ring is accommodated in the push ring 13, as shown in FIG. 12 described in the prior art, a configuration in which the retaining ring is reduced in diameter by a fastening tool is necessary. In this case, it is not necessary to provide such a structure on the pusher wheel. That is, since the structure of the push wheel can be simplified, the cost can be reduced.

<Another embodiment>
(1) The pipe joint of the present embodiment does not necessarily need to be temporarily assembled, and may be transported to the work site in a state in which each component is disassembled. In this case as well, in order to insert a retaining ring Since no separate process is required, the construction method remains the same.
(2) Although the pipe joint of this embodiment was provided with the joint main body 12 interposed between the two joint pipes 11 and 11, instead of the joint main body 12, as shown in FIG. You may make it use the pipe 20 to connect.

Half sectional view showing the construction state of the pipe joint The front view which shows the rubber packing ring of the pipe joint shown in FIG. AA sectional view of the packing ring shown in FIG. Front view showing the retaining ring of the pipe joint shown in FIG. The figure which shows another structural example of the cutting | disconnection location of the retaining ring shown in FIG. Partial sectional view showing a temporarily assembled state of the pipe joint shown in FIG. Partial sectional view showing the first half of the construction of the pipe joint shown in FIG. Partial sectional view showing the situation in the second half of construction of the pipe joint shown in FIG. The figure which shows the structure of the packing ring unit which concerns on another embodiment. The perspective view which shows the whole structure of the protection ring shown in FIG. The figure which shows the structure of the packing ring unit which concerns on another embodiment. Half sectional view showing a construction state of a pipe joint according to another embodiment Half sectional view showing the state of construction of pipe joints according to the prior art The fragmentary sectional view which shows the temporary assembly state of the pipe joint shown in FIG. Partial sectional view showing the situation in the first half of the pipe joint shown in FIG. Partial sectional view showing the situation in the first half of the pipe joint shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Joint pipe 12 Joint main body 12a Protruding part 12c Receiving part 13 Push ring 13a Protruding part 14 Fastening tool 15 Packing ring 15g Housing part 16 Retaining ring 17 Protective ring 18 Protective ring

Claims (10)

A press ring that has a protruding portion on the outer periphery and is fitted on the outer periphery on one end side of the joining pipe,
It has a projecting portion facing the projecting portion on the side facing the press ring, and a receiving portion that extends toward the press wheel on the inner peripheral side of the projecting portion, and is fitted with a circumferential gap on the outer periphery of the joining pipe A pipe or a fitting body,
A fastener capable of moving the push ring in the direction of the pipe or the joint body;
A packing ring that is provided between the pipe or the joint main body and the joint pipe and is fitted to the receiving part by its own elastic deformation caused by direct pressing by the pressing wheel that moves by operation of the fastener. When,
A pipe joint comprising a retaining ring for preventing the joining pipe from being detached from the pipe or the joint body,
An accommodation portion for accommodating the retaining ring is provided on the inner surface side of the packing ring that contacts the joining pipe, and the packing ring and the retaining ring are fitted to the receiving portion by operation of the tightening tool. A pipe joint characterized in that an inner diameter of the retaining ring is reduced so as to be in close contact with the outer periphery of the joining pipe.   2. The pipe joint according to claim 1, wherein an inner diameter of the retaining ring is set to be larger than an inner diameter of the packing ring in a natural state.   3. The housing according to claim 1, wherein when the retaining ring is housed in the housing portion, the retaining ring is housed via a protection member that prevents the packing wheel from being scratched by the retaining ring. Pipe fittings.   The said protective member is formed in a ring shape, The slit along the pipe-axis direction of the said joining pipe is formed so that the internal diameter may be easily diameter-reduced by operation of the said fastener. 3. The pipe joint according to 3.   The pipe joint according to claim 3 or 4, wherein the protection member is formed with a space in which the retaining ring can move along the pipe axis direction of the joint pipe.   The pipe joint according to any one of claims 3 to 5, wherein the protection member is formed of a material that is softer than the retaining ring and harder than the packing ring.   The retaining ring is formed in a substantially C shape in which a part in the outer peripheral direction is cut, and is formed so that the shape on the outer diameter side in contact with the packing ring at the cut portion is smooth. The pipe joint according to any one of claims 1 to 6, wherein the pipe joint is characterized. It is a packing ring used for the pipe joint according to any one of claims 1 to 7,
A packing ring characterized in that a receiving portion for receiving a retaining ring is provided on the inner surface side that comes into contact with the joining pipe, and is fitted into the receiving portion by operation of a fastener.   The packing ring unit which accommodated the retaining ring in the said accommodating part of the packing ring of Claim 7.   The packing ring unit according to claim 9, wherein the retaining ring is accommodated in the accommodating portion via the protective member according to claim 3.

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