JP4759478B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint that connects pipes, and more particularly, to a pipe joint that connects pipes while preventing fluid leakage.

After installation, fluid pipes such as water pipes have various displacements such as temperature expansion and contraction displacement of pipes, displacement of pipe misalignment due to ground subsidence, displacement in the direction of the pipe axis or the direction perpendicular to the pipe axis due to earthquakes, etc. Since an external force is received due to the displacement, it is necessary to take measures to absorb or release the external force applied to the tube in order to prevent the tube from being damaged by the external force.
Absorption or diffusion of external forces applied to such pipes due to various displacements is generally performed in pipe joints used for connecting pipes.
Specifically, while maintaining the sealing property of the pipe connection part by interposing an elastic elastic packing between the pipe joint installed across the pipe ends and the pipe end or the pipe end outer surface, It is attempted to absorb or diffuse external force.
JP 2005-3064 A JP 2003-247679 A JP 2002-188775 A JP 2000-291857 A

However, in the conventional pipe joint, (1) the function of the packing is mainly to exhibit a sealing function such as a liquid-tight function and an air-tight function, and the packing has no gap between the press ring and the pipe end. Since it is configured to be crimped, it was not sufficient in terms of absorption and diffusion of external force. (2) In addition, the configuration in which the press ring is bolted to the sleeve is common, and there is almost no freedom of deformation of the packing interposed between them, and the external force absorption has not been sufficiently performed. (3) In addition, the conventional form cannot be mounted unless the bolt fastening operation, packing insertion operation, etc. are performed separately, and must be transported in the state where various parts are disassembled, and assembled and connected. The work required complicated operations. (4) In addition, the conventional pipe joint is exposed to an external force because the part that exerts a substantial coupling action is exposed, thereby causing deterioration of the wearing condition such as loosening and damage to the part. There was a risk of it occurring.
Accordingly, the main problem of the present invention is that it can protect the piping system from external force by absorbing stress accompanying various displacements occurring in the piping system while exhibiting the sealing function of the joint, and is excellent in ease of installation. It is to provide a pipe joint.

  The present invention that has solved the above problems is as follows.

<Invention of Claim 1 >
A sleeve having a step on the inner peripheral surface, and having an inner diameter on both side surfaces enlarged through the step,
A support ring, an elastic stretchable annular packing, and a push ring are positioned in this order from the sleeve center side in the large inner diameter portion that is expanded in diameter.
The support ring is restricted from moving toward the sleeve center by the step,
The annular packing has a shape in which the outer peripheral surface side is narrowed in a hook shape from the support ring side toward the sleeve end surface side, and the inner peripheral surface side has an annular tongue piece protruding from the support ring side to the shaft core side through a concave groove ,
The push ring is movable to the support ring side by pushing means while being guided by the sleeve inner peripheral surface,
The annular packing is deformed so that the outer peripheral surface thereof is pressed toward the sleeve central side as the push ring moves, and the annular tongue piece is moved toward the sleeve central side and the diameter thereof is reduced while maintaining the concave groove. A pipe joint characterized by that.

(Function and effect)
In the pipe joint of the present invention, the support ring, the elastic elastic ring packing, and the press ring are preferably arranged in this order from the sleeve center side between the convex portion of the sleeve inner peripheral surface and the sleeve end surface. Since it is positioned coaxially with the shaft, the support ring, the annular packing and the push ring are protected by the sleeve. Therefore, when used for embedding in soil, the contact portions of each member and each member for exerting a substantial connecting action and sealing function are protected from erosion and external force caused by powder or liquid. It is possible to maintain a good connected state between the connected pipes.
Further, in the pipe joint of the present invention, the support ring, the elastic stretchable annular packing, and the press ring are positioned in this order from the sleeve center side, preferably coaxially with the sleeve center shaft, within the large inner diameter portion. Therefore, the support ring, the annular packing, and the push ring are protected by the sleeve. Therefore, when used for embedding in soil, the contact portions of each member and each member for exerting a substantial connecting action and sealing function are protected from erosion and external force caused by powder or liquid. It is possible to maintain a good connected state between the connected pipes.
Further, since the outer peripheral surface side of the annular packing is narrowed in a hook shape from the support ring side toward the sleeve end surface side, the pusher wheel is movable toward the support ring side while being guided by the sleeve inner peripheral surface. Are prevented from being deformed into an unintended shape and being damaged by being sandwiched between unintended portions of the annular packing.
Further, the inner peripheral surface of the annular packing has a shape having an annular tongue protruding from the support ring side through the concave groove toward the shaft core side, and when the outer peripheral surface is pressed toward the sleeve central side by a push ring, The packing is deformed so as to reduce the diameter while the annular tongue piece is moved toward the center of the sleeve while maintaining the concave groove. For this reason, the annular packing can adjust the reduced diameter of the annular tongue piece according to the pressing condition, and the contact pressure can be adjusted with respect to the outer surface of the connected pipe. In this abutting state, the sleeve and the outer surface of the connected pipe are sealed. At this time, since the annular packing is elastic and stretchable, the tube to be connected inserted into the sleeve receives external force due to various displacements, and the tube end in the sleeve moves in the tube axis extending direction or the direction perpendicular thereto. Or even if the angle deviates, the center of both pipe ends, or the shake occurs, the annular tongue piece further contracts or expands in each direction to follow the movement of the connected pipe outer surface, Therefore, the external force can be absorbed or diffused while maintaining the press contact property (sealing property). The sealing function in the present invention includes a watertight function for water, a liquidtight function for other liquids, an airtight function for gas, and a powdery function for powder. Meaning.
On the other hand, the annular packing has a concave groove on the support ring side from the annular tongue piece in a mode in which the sealing function is exhibited. Accordingly, the fluid such as water or gas that has passed between the outer surface of the connected pipe and the sleeve is guided to the concave groove when reaching the annular packing, and is pushed and expanded by the inflow pressure at that time. Along with this, the annular tongue piece is pressed against the outer surface of the connected pipe, so that a reliable sealing function is exhibited. The so-called automatic seal function is exhibited. Therefore, the annular packing does not need to be firmly pressed against the outer surface of the connected pipe and the inner peripheral surface of the sleeve, and allows the connected pipes to have a state where they can be expanded and contracted, and the packing itself has a longer life. Further, the frequency of tightening the push wheel can be reduced.
On the other hand, according to the present invention, the pressure contact with the pipe outer surface and the opening are selected only by the movement of the push wheel. Therefore, the pipe ends can be simply connected by simply inserting the pipe ends to be connected to the proper position and moving the push ring, and each member such as the support ring is always placed in the sleeve. It can be handled in the state of the assembled assembly and has excellent handleability.
Furthermore, the pipe joint of the present invention has an annular packing or the like at each end of the sleeve, and can separately act on the connected pipe. Therefore, even if there is a slight difference in the diameters of the pipes to be connected, the ring packing can be operated with an appropriate pressure corresponding to each pipe to be connected by adjusting the pressure contact condition of each ring packing. Further, at the time of installation on site, it can be transported by temporarily fixing it in an assembled state to the pipe end of one of the connected pipes. If it does in this way, the construction aspect which only inserts and sets the pipe end (pipe end which is not temporarily fixed) of the other to-be-connected pipe | tube to the appropriate position in a sleeve is also attained.

<Invention of Claim 2 >
The pushing means is
A circumferential groove formed in the vicinity of the sleeve end surface of the large inner diameter portion;
A lock ring fitted in the circumferential groove;
A bolt holding ring that is interposed between the push ring and the lock ring and has a large number of bolt holes penetrating along the axial direction in the end surface;
A bolt screwed into the bolt hole,
The bolt holding ring is restricted from moving toward the sleeve end face by a lock ring,
By screwing the bolt into the bolt hole and moving it through the bolt retaining ring toward the center of the sleeve,
The junk ring is moved in the sleeve central direction, claim 1 pipe coupling as claimed.

(Function and effect)
According to the present invention, the pressing wheel can be moved by a simple operation of screwing the bolt, and the pressure contact and release of the packing can be selected.
Furthermore, in the present invention, since the pushing means is also located within the large inner diameter portion of the sleeve, the pushing means is also protected from erosion and external force from the outside when used for the buried portion in the soil. In addition, by protecting the configuration that substantially triggers the function of the pushing means, unintended loosening of the annular packing due to external force or the like can be prevented.
Further, in the present invention, similarly to the first aspect of the invention, it can be handled in the state of an assembly in which the pushing means is also incorporated, and is excellent in handleability.

<Invention of Claim 3 >
The pusher wheel has a diameter-reducing surface that is tapered from the support ring side toward the sleeve end surface side on the sleeve center side end surface, and this diameter-reduced surface constitutes a pressing surface that contacts the outer peripheral surface of the annular packing. The pipe joint according to claim 1 or 2 .

(Function and effect)
In the annular packing of the present invention, since the outer peripheral surface side is narrowed in a hook shape from the support ring side to the sleeve end surface side, the pressing surface is configured such that the diameter of the pusher wheel is reduced from the support ring side to the sleeve end surface side. When the pressing surface presses the squeezed portion, a part of the pressing force preferably acts toward the connected pipe, so that the annular tongue piece moves toward the support ring side. It becomes easy to make a deformation that reduces the diameter, and further prevents deformation of the elastic stretchable annular packing into an unintended shape.

<Invention of Claim 4>
The pipe joint according to claim 3 , wherein an auxiliary ring having rigidity higher than that of the push ring is interposed between the push ring and the bolt holding ring, and the push ring is moved to the sleeve center side through the auxiliary ring.

(Function and effect)
In the present invention, since the pushing force from the bolt tip is transmitted to the pusher wheel through the highly rigid auxiliary ring, the pusher wheel is prevented from being damaged.

<Invention of Claim 5 >
An annular band member mounted on the outer peripheral surface of one of the connected pipes;
Is fastened against member whose one end is positioned within the sleeve or sleeve, comprises a string-like body is the other end is fastened to said annular band member, according to any one of claims 1-4 Pipe fittings.

(Function and effect)
In the present invention, by mounting an annular band member on the outer peripheral surface of the connected pipe, the sleeve and the member positioned in the sleeve (hereinafter, the sleeve or the member positioned in the sleeve are collectively referred to as a pipe joint main body portion). ) Comes into contact with the annular band member when it is slid along the tube axis. Therefore, by adjusting the thickness of the annular band member and the mounting force (tightening condition) to the connected pipe, further sliding movement of the pipe joint main body can be restricted.
And since it has the string-like body which connects the said band member and a pipe joint main-body part, the movement amount that a to-be-connected pipe tends to come out from a pipe joint main-body part can be adjusted with a string-like body length. Of course, the effect of preventing omission can be exhibited.

  As described above, according to the present invention, while exhibiting the sealing function of the joint, it is possible to protect the piping system from the external force by absorbing the external force accompanying various displacements generated in the piping system, and from the external force to the movable part. A pipe joint is provided that is protected, and can be easily mounted and the like, and has excellent workability.

  Next, embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a state of the pipe joint 1 according to the present embodiment before moving the push ring (before mounting). FIG. 2 is an enlarged cross-sectional view in the vicinity of the annular packing. 3 is a view taken in the direction of arrows III-III in FIG. FIG. 4 is a partial cross-sectional view showing a state of the pipe joint 1 according to the present embodiment after the push ring is moved (after mounting). FIG. 5 is a VV arrow view.

  The pipe joint 1 according to this embodiment includes a sleeve 10, a support ring 20, an annular packing 30, a push ring 40, an auxiliary ring 50, a lock ring 60, a bolt holding ring 70, a bolt 72, and an annular band member. 80 and a connecting wire 90.

  The sleeve 10 has a cylindrical shape, and a step 11 is formed on the inner peripheral surface 10i thereof. The inner diameter on the end surface side of the step 11 is increased. That is, the sleeve 10 of the present embodiment has a large inner diameter portion 12 that is expanded on both end face sides, and is adjacent to the large inner diameter portions 12 and 12 via a step 11, and a small inner diameter portion on the sleeve center 10c side. 13 has a shape. A circumferential groove 14 is formed in the sleeve inner circumferential surface 10i in the circumferential direction at a position spaced a predetermined length from the step 11 toward the sleeve end surface 10s. As the material of the sleeve 10, a material used for forming a known joint sleeve is used. A flexible material used for a flexible tube called a so-called poly tube is suitable.

  The support ring 20, the annular packing 30, the push ring 40, the auxiliary ring 50, the lock ring 60, the bolt holding ring 70, and the bolt 72 are arranged in this order from the sleeve center 10 c side to the inside 12 of the sleeve 11 whose diameter is increased. And is stored so as to be substantially coaxial with the axis of the sleeve 11.

  The support ring 20 has an outer diameter larger than that of the small inner diameter portion 13 adjacent to the large inner diameter portion 12 and the step 11 on the sleeve center 10 c side, and is located closest to the sleeve center of the large inner diameter portion 12. Therefore, the movement of the sleeve 11 toward the center of the sleeve is restricted by the contact of the end face of the support ring with the step 11. In this embodiment, as shown in the figure, the outer diameter of the support ring 20 is configured to be substantially the same as the inner diameter of the large inner diameter portion, thereby eliminating radial play in the sleeve. As the support ring 20, for example, a flexible tube having a tube diameter smaller than that of the sleeve 11 and cut short can be used.

  The annular packing 30 has elastic elasticity and is easily deformed by an appropriate pressure as compared with the sleeve 11, the support ring 20, and the push wheel 40. In the annular packing 30, the outer peripheral surface 31 side is narrowed in a hook shape from the support ring 20 side toward the sleeve end surface 10 s, and the inner peripheral surface 32 side protrudes from the support ring 20 side through the concave groove 32 </ b> A toward the shaft core side. It has a shape having an annular tongue 32B. Further, in the annular packing 30 of this embodiment, as shown in the drawing, a part of the outer peripheral surface 31 on the sleeve center 10c side is in contact with the sleeve inner peripheral surface 10i, so that the diameter-expanding deformation is difficult. . As a specific material of the annular packing 30, a known elastic expansion / contraction member used for joint packing can be used. For example, various rubber materials such as natural rubber and synthetic rubber can be used.

  The pusher wheel 40 is positioned adjacent to the annular packing 30 on the sleeve end surface 10 s side of the annular packing 30. Further, the outer diameter of the pusher wheel 40 is formed substantially the same as the inner diameter of the large inner diameter portion 12, and is movable toward the support ring 20 while being guided by the sleeve inner peripheral surface 10i. Further, the end surface on the sleeve center side of the pusher wheel 40 has a diameter-reducing surface 41 that is tapered from the support ring side toward the sleeve end surface 10 s, and this diameter-reducing surface 41 is the outer peripheral surface 31 of the annular packing 30. The press surface which touches is comprised. Therefore, when the push ring 40 is moved to the support ring 20 side and the flange-like outer peripheral surface 31 of the annular packing 30 is pressed, the pressing force has not only the sleeve center side 10c direction but also the inner diameter direction B component. Therefore, it helps to reduce the diameter of the annular packing 30. The taper degree of the reduced diameter surface 41 is appropriately determined according to the degree of squeezing of the outer peripheral surface 31 of the annular packing 30. The material of the press wheel 40 is not particularly limited, and a known flexible material or metal material can be used.

  The auxiliary ring 50 is interposed between the pusher wheel 40 and the bolt auxiliary ring 70 in order to assist the movement of the pusher wheel 40 by a bolt 73 described later. The auxiliary ring 50 is configured such that the end surface on the sleeve center 10c side is in contact with the end surface on the sleeve end surface 10s side of the pusher wheel 40, and has higher rigidity than the pusher wheel 40, and the pushing force of the bolt 72 is efficiently applied to the pusher wheel. introduce. Note that the auxiliary ring 50 is not always necessary, and the tip of a bolt 72 described later can be configured to directly contact the push wheel 40.

  The bolt retaining ring 70 is positioned adjacent to the auxiliary ring 50 on the sleeve end surface 10 s side of the auxiliary ring 50. The bolt holding ring 70 is formed with a large number of bolt holes 71 penetrating along the axial direction on the end face. The bolt hole 71 is threaded, and the bolt 72 is screwed together. The material of the bolt holding ring 70 is not particularly limited, and a flexible material, a metal material, or the like is used.

  The lock ring 60 is a so-called C ring which is partially cut away and is fitted in the circumferential groove 14 formed in the sleeve inner peripheral surface 10i. Further, the lock ring 60 is formed in such a manner that the inner diameter thereof is smaller than the outer diameter of the bolt holding ring and does not block the bolt holes 71, 71. At the same time, in the state where the chipped separation portion 60i is contracted and reduced in diameter, it can be accommodated in the large inner diameter portion 12. Therefore, after the support ring 20, the annular packing 30, the push ring 40, the auxiliary ring 50, and the bolt holding ring 70 are stored in this order in the large inner diameter portion 12, the separation portion of the lock ring 60 is contracted to reduce the diameter. It can be fitted in the circumferential groove 14. When the lock ring 70 is fitted in the circumferential groove 14, the other members such as the annular packing 30 that are housed in the large inner diameter 12 are prevented from coming off from the sleeve end surface 10 s side. The lock ring 60 is preferably made of a material that can constitute a spring on which a force is applied to return the locking portion when the spacing portion is contracted. Although it does not specifically limit, a metallic material and a flexible material are used suitably.

  The bolt 72 is screwed into the bolt hole 71 of the bolt holding ring 70 from the sleeve end surface 10s side through the collar 72c. The collar 72 c is used for avoiding the lock ring 60 and preferably performing bolting, and accordingly, the collar length is appropriately determined according to the thickness of the lock ring 60.

  The annular band member 80 is attached to the outer peripheral surface Ps of the one connected pipe P1. The mounting method is not particularly limited, but it is configured so that it can be mounted firmly and securely so as not to be easily detached after mounting. For example, the annular band member 80 in the illustrated example is configured so that it can be attached and fixed to the outer surface of the connected pipe using a clamp structure. Wire tightening can also be taken.

  The connecting wire 90 connects the annular band member 80 to the bolt holding ring 70 and the bolt 72 or the sleeve 10 screwed into the bolt hole 71. The length of the connecting wire 90 is a length that restricts the connected pipe P <b> 1 so as not to come out of the sleeve 10. In this embodiment, a stainless steel wire is used as a connecting wire, and both members are connected to each other by fixing the annular band member 80 and the bolt 72 with wire fixing bolts. In addition, a string-like thing can be used instead of a stainless steel wire. For example, a chain, a rope, etc. can be used. The material of the string-like body is not particularly limited as long as it does not depart from the intention of the present invention. The fixing method for the annular band member 80 and the fixing method for the bolts 72 and the like are based on a known string-like body fixing technique. Furthermore, the number of connecting wires 90 is not limited to one, and a plurality of connecting wires 90 may be provided. Preferably, a plurality of connecting wires 90 are provided at equal intervals in the circumferential direction.

Next, a method of using the pipe joint 1 of the present embodiment described above will be described.
First, the support ring 20 and the like are stored in the sleeve 10, and the lock ring 60 is prevented from being detached. Next, the pipes to be connected P1 and P2 are inserted from both ends into the sleeve 10 in which the support ring 20 and the like are accommodated. At this time, the insertion lengths P1 and P2 of the connected pipes are made different. In the illustrated example, the insertion length of the connected pipe P1 is shortened. Of course, the pipe ends of both pipes P1 and P2 are positioned on the other end side with respect to the annular packing 30.

  Next, the annular band member 80 is mounted on the outer peripheral surface Ps of the coupled pipe P1 having a short insertion length. At this time, the sleeve end face 10s and the annular band member 80 are separated from each other by an appropriate length. The to-be-connected pipe P1 to which the annular band member 80 is attached has a convex portion formed on the outer peripheral surface by the attachment of the annular band member, and further insertion into the sleeve 10 is restricted. The annular band member 80 may be attached to the connected pipe P1 in advance. If it is mounted in advance, if the distance between the annular band member mounting position and the connected tube end is less than 1/2 of the sleeve length, the connected tube with the connected band attached to the tube end Does not cross the center of the sleeve.

  Next, the bolt 72 is rotated so as to be screwed into the bolt hole 71. Then, the bolt 72 passes through the bolt hole 71 and the tip thereof abuts on the auxiliary ring 50. When further rotated, the tip of the bolt 72 acts to push the auxiliary ring 50 toward the sleeve center 10c. At this time, the bolt holding ring 50 tries to move toward the sleeve end face 10s, but its movement is restricted by the presence of the lock ring 70, and thus only the moving force of the auxiliary ring 50 acts substantially.

  When the auxiliary ring 50 is moved in the direction of the sleeve center 10c by bolting, the adjacent push wheel 40 is also moved toward the sleeve center 10c. At this time, the press ring 40 presses the outer circumferential surface 31 of the elastic elastic ring packing 30 toward the sleeve center 10c, and the ring packing 30 is sandwiched between the press ring 40 and the support ring 20 and deformed. Since the pressing force at this time acts not only in the sleeve center 10c direction but also in the inner diameter direction B as described above, the deformation of the annular packing 30 causes the annular tongue 32B to move toward the sleeve center 10c while maintaining the concave groove 32A. And is deformed to reduce the diameter.

  Thus, the annular tongue 32B of the elastic stretchable annular packing 30 is brought into contact with the outer peripheral surfaces Ps, Ps of the connected pipes P1, P2, and the pipe joint 1 has a sealing function at the pipe ends of the connected pipes P1, P2. Installed.

  Thereafter, the annular band member 80 and the bolt 72 are connected by a connecting wire 90. At this time, the connecting wire 90 is given a certain margin, but its length is adjusted to a length that prevents the connected pipe P1 on the side where the annular band member 80 is attached from being pulled out of the sleeve 10 during tension. To do. The connecting wire 90 can be fastened not to the bolt 72 but to other members of the joint main body, but it is preferable because the member located on the sleeve end surface 10s side is easy to fasten. It is not desirable because it is elastic and stretchable. Moreover, you may perform the connection of the coupling main-body part and the tubular band member 80 by the connection wire 90 before bolting.

  Here, in the pipe joint 1 of the present embodiment, the annular packings 30 and 30 are brought into contact with the outer peripheral surfaces Ps and Ps of the connected pipes P1 and P2 to exert a sealing function and connect the connected pipes P1 and P2. The connected pipes P1 and P2 can slide while being in contact with the annular packings 30 and 30 when there is an excessive moving force in the pipe axis direction A. This is a so-called expansion / contraction flexible joint.

  Accordingly, the insertion length of one of the connected pipes P1 is shortened, and the annular band member 80 and the connecting wire 90 ensure that a predetermined amount of movement of the one connected pipe P1 in the pipe axis direction is removed and overinserted. Can prevent the other connected pipe P2 from being inserted longer, and the other connected pipe P2 has an insertion length to intentionally adjust the detachable length and accessible length of the connected pipes P1 and P2. Will be able to.

  In the above embodiment, the sleeve 11 having the inner diameter shape in which the large inner diameter portion 12 and the small inner diameter portion 13 are adjacent to each other through the step 11 is used. Since the main function is to restrict the movement toward the 10c side, for example, at the appropriate position from the sleeve end surface so as to restrict the movement of the support ring 20 toward the sleeve center 10c, the shaft core side (inner diameter) It is also possible to use a sleeve having a convex portion projecting in the direction) on the inner peripheral surface 10i.

  As is clear from the above description, the pipe joint 1 of the present invention can protect the piping system from the external force by absorbing the external force accompanying various displacements generated in the piping system, while exhibiting the sealing function of the joint. In particular, it is an expansion / contraction flexible pipe joint that can protect the movable part from the external force, can be easily mounted, has excellent workability, and can adjust the degree of separation in the pipe axis direction of the connected pipe. It can be said.

  INDUSTRIAL APPLICABILITY The present invention can be used for a pipe joint that connects pipes through which various fluids such as water pipes, gas pipes, plant pipes, and the like are held in a sealed state.

It is a partial cross section figure of the pipe joint of this form. It is the partially expanded sectional view. It is the III-III arrow line view of FIG. It is a partial cross section figure which shows the mode at the time of mounting | wearing of the pipe joint of this form (after pipe end connection). It is the VV arrow directional view.

  DESCRIPTION OF SYMBOLS 1 ... Pipe joint, 10 ... Sleeve, 10c ... Sleeve center, 10i ... Sleeve inner peripheral surface, 10s ... Sleeve end surface, 11 ... Step, 12 ... Sleeve end surface side large inner diameter part, 13 ... Sleeve center side small inner diameter part, 14 ... Circumferential groove, 20 ... support ring, 30 ... annular packing, 31 ... outer peripheral surface of annular packing, 32 ... inner peripheral surface of annular packing, 32A ... concave groove of annular packing, 32B ... annular tongue, 40 ... push ring, 41 ... inner surface of packing wheel (packing pressing surface), 50 ... auxiliary ring, 60 ... lock ring, 60i ... lock ring separating portion, 70 ... bolt retaining ring, 71 ... bolt hole, 72 ... bolt, 72c ... collar, 80 ... annular Band member, 90: connecting wire, P1, P2: connected pipe, Ps: outer surface of connected pipe, A: axial direction, B: inner diameter direction.

Claims (5)

A sleeve having a step on the inner peripheral surface, and having an inner diameter on both side surfaces enlarged through the step,
A support ring, an elastic stretchable annular packing, and a push ring are positioned in this order from the sleeve center side in the large inner diameter portion that is expanded in diameter.
The support ring is restricted from moving toward the sleeve center by the step,
The annular packing has a shape in which the outer peripheral surface side is narrowed in a hook shape from the support ring side toward the sleeve end surface side, and the inner peripheral surface side has an annular tongue piece protruding from the support ring side to the shaft core side through a concave groove ,
The push ring is movable to the support ring side by pushing means while being guided by the sleeve inner peripheral surface,
The annular packing is deformed so that the outer peripheral surface thereof is pressed toward the sleeve central side as the push ring moves, and the annular tongue piece is moved toward the sleeve central side and the diameter thereof is reduced while maintaining the concave groove. A pipe joint characterized by that. The pushing means is
A circumferential groove formed in the vicinity of the sleeve end surface of the large inner diameter portion;
A lock ring fitted in the circumferential groove;
A bolt holding ring that is interposed between the push ring and the lock ring and has a large number of bolt holes penetrating along the axial direction in the end surface;
A bolt screwed into the bolt hole,
The bolt holding ring is restricted from moving toward the sleeve end face by a lock ring,
By screwing the bolt into the bolt hole and moving it through the bolt retaining ring toward the center of the sleeve,
The junk ring is moved in the sleeve central direction, claim 1 pipe coupling as claimed. The pusher wheel has a diameter-reducing surface that is tapered from the support ring side toward the sleeve end surface side on the sleeve center side end surface, and this diameter-reduced surface constitutes a pressing surface that contacts the outer peripheral surface of the annular packing. The pipe joint according to claim 1 or 2 . The pipe joint according to claim 2 , wherein an auxiliary ring having rigidity higher than that of the press ring is interposed between the press ring and the bolt holding ring, and the press ring is moved to the sleeve center side through the auxiliary ring. An annular band member mounted on the outer peripheral surface of one of the connected pipes;
The pipe joint according to any one of claims 1 to 4 , further comprising a string-like body having one end side fastened to the pipe joint itself and the other end side fastened to the annular band member.

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