JP2008196609A - Pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe fitting capable of preventing a leakage of a fluid from a pipe joint portion even when a spigot part is displaced relatively with respect to a socket part in the pipe axial direction so as to detach from the socket part by unexpected external force. <P>SOLUTION: A pressing ring 13 has the inner peripheral surface facing the outer peripheral surface 23a of the spigot part 23. A packing 1 has an extension part 1f extending continuously with the push part 1a oppositely to the top seal part 1b in the pipe axial direction and located between the inner peripheral surface of the pressing ring 13 and the outer peripheral surface 23a of the spigot part 23, a rear seal part 7 formed on the extension part 1f so as to seal the inner peripheral surface of the pressing ring 13 and the outer peripheral surface 23a of the spigot part 23, and a lip part R formed by carving the outer peripheral surface 1d of the push part 1a toward the inner side of the push part 1a. The extension part 1f, the rear seal part 7 and the lip part R are respectively arranged circumferentially. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes an insertion portion that constitutes one tubular body, an inclined surface that is loosely inserted into the insertion portion, and has a diameter that decreases inward from the end surface side, and an inclined surface that is continuous with the inclined surface. And further comprising a receiving portion constituting the other tube body having a parallel surface substantially parallel to the tube axis formed inward, and an elastic material formed in a ring shape, A parallel surface that is formed between the inner peripheral surface of the receiving portion and the outer peripheral surface of the insertion portion, and that is formed between the inclined surface and the outer peripheral surface of the insertion portion, and is continuous with the pressing portion. And a front seal portion for sealing between the outer peripheral surface of the insertion portion, a push ring that is fitted along the outer peripheral surface of the insertion portion and presses the packing, and a receiving portion And a mounting member that is attached in linkage with the receiving portion and the press ring so that the relative movement of the press ring and the packing ring in the tube axis direction is restricted. That.

  Conventionally, a packing 101 as shown in FIG. 8 has been used as means for preventing leakage of fluid flowing into a pipe from a joint portion of pipes in which two pipe bodies are fastened by a push ring (see, for example, Patent Document 1). Hereinafter, the packing 101 illustrated in FIG. 8 will be described. That is, in FIG. 8A, the insertion portion 123 of the other tubular body 122 is loosely inserted into the inside of the receiving portion 103 of one tubular body 102.

  An inclined surface 103b, which is an inner peripheral surface that decreases inward from the opening end of the receiving portion 103, is formed along the circumferential direction inside the end portion of the receiving portion 103 of the tubular body 102. Yes. Further, a parallel surface 103d that is continuous inward with the inclined surface 103b and that is substantially parallel to the tube axis is formed along the circumferential direction, and is formed at an end on the inner side of the parallel surface 103d. Is formed with a rear end face 103f facing the pipe axis direction along the circumferential direction.

  The packing 101 is formed in a ring shape and is made of an elastic material such as rubber. The packing 101 has a pressing portion 101a having an outer peripheral surface substantially parallel to the inclined surface 103b along the circumferential direction. Further, on the right side of the pushing portion 101a, a leading seal portion 101b that is continuous with the pushing portion 101a and bulges out in the circumferential direction is formed. And the to-be-pressed surface 101c which the pressing surface 113c formed in the edge part by the side of the press wheel 113 presses is formed in the edge part of the paper surface left side of this pushing part 101a.

  Therefore, when connecting these tubular bodies 102 and 122, first, the insertion portion 123 is inserted into the receiving portion 103 in a state in which the push wheel 113 and the packing 101 are sequentially fitted to the insertion portion 123, and then, The T-head bolt 111 is inserted into the mounting holes 103h and 113d formed in the flange portion 103g formed in the receiving portion 103 and the flange portion 113b of the press ring 113, and the nut 112 is screwed in and closed evenly. 8B, the pressed surface 101c of the packing 101 is pressed by the pressing surface 113c of the press wheel 113 in the direction of the outlined arrow. The leading seal portion 101b of the packing 101 is elastically deformed when the parallel surface 103d of the receiving portion 103 and the outer peripheral surface of the insertion portion 123 come into contact with each other, and the leading end portion of the leading seal portion 101b comes into contact with the back end surface 103f. Is pushed in. As a result, the space between the parallel surface 103d of the receiving port portion 103 and the outer peripheral surface of the insertion port portion 123 is sealed, and leakage of fluid flowing through both the tubular bodies 102 and 122 is prevented.

Japanese Unexamined Patent Publication No. 2003-161393 (page 6, FIG. 4)

  However, in the conventional pipe joint provided with the packing 101 for preventing fluid leakage, for example, an unexpected external force is generated due to, for example, an earthquake, and the insertion portion 123 is detached from the receiving portion 103 in the tube axis direction. When this occurs, the leading seal portion 101 b of the packing 101 is separated from the outer peripheral surface of the insertion portion 123 and the inner peripheral surface of the receiving portion 103, and the parallel surface 103 d of the receiving portion 103 and the outer periphery of the insertion portion 123. The sealing performance between the pipes 102 and 122 is not maintained, and the fluid flowing through both the tubular bodies 102 and 122 flows between the outer peripheral surface of the pushing portion 101a and the inclined surface 103b of the receiving portion 103 or inside the pushing portion 101a. There is a problem that the gas passes through between the peripheral surface and the outer peripheral surface of the insertion portion 123 and leaks to the outside of both the tubular bodies 102 and 122.

  The present invention has been made paying attention to such problems, and even if an unexpected external force is generated and the relative movement in which the insertion portion is detached from the receiving portion in the tube axis direction occurs, It aims at providing the pipe joint which prevents the leakage of the fluid from a junction part.

In order to solve the above problem, a pipe joint according to claim 1 of the present invention is
An insertion portion constituting one tube,
An inclined surface that is loosely inserted into the insertion portion and has an inner peripheral surface with a diameter that decreases inward from the end surface side, and a tube axis that is formed continuously inward from the inclined surface. A receiving part that constitutes the other tubular body having a substantially parallel parallel plane,
It is made of an elastic material formed in a ring shape, and is disposed between the inner peripheral surface of the receiving portion and the outer peripheral surface of the insertion portion, and is located between the inclined surface and the outer peripheral surface of the insertion portion. A packing having a pushing portion and a leading seal portion formed continuously with the pushing portion for sealing between the parallel surface and the outer peripheral surface of the insertion portion;
A press ring that is fitted along the outer peripheral surface of the insertion portion and presses the packing;
In a pipe joint comprising: an attachment member attached in linkage with the receptacle and the push ring so that relative movement of the receptacle, the push ring, and the packing in the tube axis direction is restricted. ,
The press ring has an inner peripheral surface facing an outer peripheral surface of the insertion portion,
The packing is
An extended portion that extends continuously from the pushing portion in the tube axis direction on the side opposite to the leading seal portion and is located between the inner peripheral surface of the push ring and the outer peripheral surface of the insertion portion,
A rear seal portion that is formed in the extending portion and seals between an inner peripheral surface of the press ring and an outer peripheral surface of the insertion portion;
And a lip portion formed on the outer peripheral surface of the pushing portion and gradually decreasing in thickness toward the leading seal portion side.
According to this feature, since the lip portion and the rear seal portion are formed in addition to the leading seal portion, an unexpected external force is generated due to, for example, an earthquake, and the insertion portion is detached from the receiving portion. Even if relative movement of a predetermined length occurs in the tube axis direction and the sealing property between the parallel surface of the receiving port and the outer peripheral surface of the insertion port is not maintained by the leading seal portion, the parallel of the receiving port The lip portion is pressed against the inclined surface of the receiving portion in the direction in which the fluid leaks by the fluid of the tubular body flowing between the surface and the outer peripheral surface of the pressing portion, and the outer peripheral surface of the pressing portion and the receiving portion The seal between the inclined surfaces is maintained. Moreover, the seal between the inner peripheral surface of the press wheel and the outer peripheral surface of the insertion portion is still maintained by the rear seal portion that seals between the inner peripheral surface of the press wheel and the outer peripheral surface of the insertion portion, As a result, leakage of fluid flowing through the tube can be prevented. In addition, even if an extreme relative movement between the receiving portion and the insertion portion occurs, the sealing of the tubular body can be maintained as long as the rear seal portion is sealed.

The pipe joint according to claim 2 of the present invention is the pipe joint according to claim 1,
The lip portion is characterized in that one strip is formed on the outer peripheral surface of the pushing portion in the vicinity of the end surface of the receiving portion.
According to this feature, when the packing is mounted, the lip portion does not contact the inclined surface of the receiving portion until the leading seal portion seals between the parallel surface of the receiving portion and the outer peripheral surface of the inserting portion. Therefore, the packing can be easily attached.

The pipe joint according to claim 3 of the present invention is the pipe joint according to claim 1,
A plurality of the lip portions are formed on the outer peripheral surface of the pushing portion.
According to this feature, even if an unexpected external force is generated, the sealing performance of the tube body can be improved by forming a plurality of lip portions in the tube axis direction.

  Examples of the present invention will be described below.

  An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is an exploded perspective view showing an overall image of a pipe joint in an embodiment of the present invention. FIG. 2A is a partial cross-sectional view showing the pipe joint before the packing is attached, and FIG. 2B is a partial cross-sectional view showing the pipe joint after the packing is attached. FIG. 3 is a partial cross-sectional view showing the pipe joint when a relative movement occurs in which the insertion portion is detached from the receiving portion in the tube axis direction. 4 (a) is a partial cross-sectional view showing a pipe joint before packing attachment in the pipe joint of Modification 1, FIG. 4 (b) is a partial cross-sectional view showing a pipe joint at an intermediate stage of packing attachment, and FIG. It is a partial cross section figure which shows the pipe joint after packing attachment. FIG. 5 is a partial cross-sectional view showing the pipe joint when a relative movement occurs in which the insertion part is detached from the receiving part in the pipe axis direction. FIG. 6 is a partial cross-sectional view showing the packing of the pipe joint in the second modification. FIG. 7 is a partial cross-sectional view showing the packing of the pipe joint in the third modification.

  As shown in FIGS. 1 and 2, the structure of the pipe joint in which the other pipe is inserted into the end of one pipe and sealed in a watertight or airtight manner is substantially the same as the conventional structure. Yes. Specifically, the insertion portion 23 that is the opposite end portion of the other tubular body 22 is loosely inserted in a state where the packing 1 and the presser wheel 13 are fitted on the outer peripheral surface 23 a of the insertion portion 23. That is, it is inserted with a predetermined gap between the outer peripheral surface 23 a of the insertion portion 23 and the inner peripheral surface of the receiving portion 3. Then, the packing 1 is pushed between the inner peripheral surface of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23 by the pusher wheel 13 to seal both the tubular bodies 2 and 22 in an airtight or watertight manner.

  Further, a plurality of mounting holes 3h are formed in the circumferential direction in the flange portion 3g of the receiving portion 3 at predetermined intervals, and a flange portion 13b of the press ring 13 formed along the circumferential direction at the end portion on the nut 12 side. The mounting holes 13d formed in a plurality of flange portions 13b of the presser wheel 13 provided to face the flange portions 3g so as to be coaxial with the mounting holes 3h of the flange portion 3g of the receiving port portion 3 are arranged at predetermined intervals. In the direction.

  The T-head bolt 11 and the nut 12 as mounting members are attached to the mounting holes 3h of the flange portion 3g of the receiving port 3 and the mounting holes 13d of the flange portion 13b of the press ring 13 corresponding to the number of mounting holes 3h and 13d. As a result, the relative movement of the packing 1, the receiving port 3, and the press wheel 13 is restricted. In FIG. 1, only one set of T-head bolt 11 and nut 12 is shown, and the others are omitted.

  As shown in FIG. 2A, a specific configuration of the pipe joint is formed inwardly from the end surface 3a of the receiving portion 3 to the inside of the end portion of the receiving portion 3 of the pipe body 2. An inclined surface 3b, which is an inner peripheral surface with a reduced diameter, is formed along the circumferential direction. Further, a parallel surface 3d is formed along the circumferential direction which is continuous with the inclined surface 3b and further inward of the receiving portion 3 and substantially parallel to the tube axis. Furthermore, a rear end surface 3f facing outward from the receiving portion 3 is formed along the circumferential direction at an end portion on the further inner side than the parallel surface 3d. As will be described later, the packing 1 is inserted between the inner peripheral surface of the receiving portion 3, that is, the inclined surface 3 b and the parallel surface 3 d, and the outer peripheral surface 23 a of the insertion portion 23.

  The packing 1 of the pipe joint in the present embodiment is formed from an elastic material such as a rubber formed in a ring shape, and this packing 1 has an outer peripheral surface 1d formed substantially parallel to the inclined surface 3b. The pushing portion 1a is formed along the circumferential direction. Further, on the right side of the pushing portion 1a in FIG. 2A, a leading seal portion 1b that is continuous with the pushing portion 1a and bulges in the natural state along the circumferential direction is formed.

  Further, a gap S is formed in the outer peripheral surface 1d of the pushing portion 1a along the circumferential direction by being cut inwardly of the pushing portion 1a. By this cutting, the leading seal portion 1b side is formed. A lip portion R that gradually decreases toward the surface, that is, the wall thickness gradually decreases, is formed along the circumferential direction. The gap S is formed between the inner peripheral surface T of the lip portion R formed by cutting the pushing portion 1a and the outer peripheral surface U facing the inner peripheral surface T by this cutting. In this embodiment, the lip portion R is formed so that the pushing portion 1a is cut inward so as to form the gap S. However, the present invention is not limited to this, and the outer peripheral surface of the pushing portion 1a. It may be formed so that the lip portion R protrudes toward the leading seal portion 1b side in 1d.

  In FIG. 2 (a), on the left side of the pushing portion 1a in the drawing, the inner circumferential surface of the push ring 13 and the insertion portion are provided on the opposite side of the leading seal portion 1b in the tube axis direction continuously to the pushing portion 1a. An extending portion 1f located between the outer peripheral surface 23a of the 23 and the outer peripheral surface 23a is formed along the circumferential direction. Further, at the end of the extended portion 1f on the left side of FIG. 2A, the outer peripheral surface 1d of the extended portion 1f is directed toward the inner peripheral surface of the press ring 13 facing the outer peripheral surface 1d of the extended portion 1f. A rear seal portion 7 that bulges toward the outer peripheral surface 23a of the insertion portion 23 facing the inner peripheral surface 1e of the extending portion 1f is formed along the circumferential direction.

  The outer peripheral surface 1d of the pushing portion 1a and the outer peripheral surface 1d of the extending portion 1f indicate the outer peripheral surface 1d of the packing 1 as a whole, and the inner peripheral surface 1e of the pushing portion 1a and the inner portion of the extending portion 1f. The peripheral surface 1e shows that it is the internal peripheral surface 1e as the packing 1 whole.

  The presser wheel 13 includes an annular pressing portion 13a formed on the right side of FIG. 2A and the flange portion 13b. The annular pressing portion 13a faces the outer peripheral surface 1d of the extending portion 1f. The inner peripheral surface is formed so as to. Further, a taper surface 13e having a diameter decreasing from the end surface 3a side of the receiving port 3 toward the outer side in the tube axis direction is formed on the inner peripheral surface of the pusher wheel 13, and further continuously from the taper surface 13e. A parallel surface 13g is formed along the circumferential direction toward the outside on the receiving port 3 side and substantially parallel to the tube axis. Further, a rear end face 13f facing the outside of the receiving port 3 is formed along the circumferential direction at an outer end on the receiving port 3 side further than the parallel surface 13g. As will be described later, the packing 1 is inserted between the inner peripheral surface of the pusher wheel 13, that is, the tapered surface 13e and the parallel surface 13g, and the outer peripheral surface 23a of the insertion portion 23.

  Next, the connection of the tubes 2 and 22 will be described. First, the insertion portion 23 is inserted into the receiving portion 3 in a state where the presser wheel 13 and the packing 1 are sequentially fitted in advance to the insertion portion 23.

  Next, when a plurality of T-head bolts 11 are inserted into the flange portions 3g and 13b of the receiving portion 3 and the press ring 13 in the circumferential direction, and the nuts 12 are screwed in and closed uniformly in the same direction, FIG. As shown in (b), the outer peripheral surface 1 d of the extending portion 1 f of the packing 1 is pressed in the direction of the white arrow in the figure by the tapered surface 13 e of the presser wheel 13, and the packing 1 It is pushed toward. The leading seal portion 1b of the packing 1 is elastically deformed by coming into contact with the inclined surface 3b of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23, and the leading seal portion 1b of the packing 1 is further received by the receiving portion 3. The leading seal portion 1b is fitted between the parallel surface 3d and the outer peripheral surface 23a of the insertion opening 23 by contacting the parallel surface 3d of the insertion opening 23 and the outer peripheral surface 23a of the insertion opening 23, and finally the leading seal portion 1b. The tip is pushed in until it comes into contact with the back end surface 3f. As a result, the space between the parallel surface 3d and the outer peripheral surface 23a of the insertion portion 23 is sealed by the head seal portion 1b. Specifically, the space between the parallel surface 3d of the receiving portion 3 and the outer peripheral surface of the leading seal portion 1b is sealed, and between the outer peripheral surface 23a of the insertion portion 23 and the inner peripheral surface of the leading seal portion 1b. Is sealed.

  On the other hand, the lip R formed on the pushing portion 1a of the packing 1 is pressed in the tube axis direction by the pusher wheel 13 and is inserted between the inclined surface 3b of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23. The At this time, the lip portion R is in a closed state, and the outer peripheral surface 1d of the pushing portion 1a is continuous.

  The lip R is cut toward the inside of the push-in portion 1a, so that the thickness gradually decreases toward the leading seal portion 1b. When the lip portion R is attached, a lubricant is applied to the lip portion R to prevent the lip portion R from rolling up.

  Further, the rear seal portion 7 formed at the end of the extending portion 1f on the left side of the paper surface is pressed by the tapered surface 13e of the pusher wheel 13 in the direction of the white arrow in the figure, and the rear seal part 7 of the packing 1 is 13 is contacted with the taper surface 13e and the outer peripheral surface 23a of the insertion portion 23, and the rear seal portion 7 of the packing 1 is in contact with the parallel surface 13g of the push ring 13 and the outer peripheral surface 23a of the insertion portion 23. The back seal portion 7 is fitted between the parallel surface 13g and the outer peripheral surface 23a of the insertion portion 23 by being in contact with each other, so that the rear end portion of the rear seal portion 7 finally comes into contact with the rear end surface 13f of the presser wheel 13. 1 is pressed by the pusher wheel 13. As a result, in addition to the front seal portion 1b, the rear seal portion 7 assists in sealing between the parallel surface 13g of the pusher wheel 13 and the outer peripheral surface 23a of the insertion portion 23.

  When an unexpected external force due to an earthquake or the like occurs, as shown in FIG. 3, the relative movement in which the insertion portion 23 is detached in the tube axis direction, that is, in the direction of the white arrow in the figure, occurs and the packing has been elastically deformed. One leading seal portion 1b is restored to its original natural state, and the leading seal portion 1b that is in contact with the parallel surface 3d of the receiving portion 3 is separated toward the tube axis. As a result, the sealing performance between the parallel surface 3d of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23 is not maintained.

  However, as shown above, a lip portion R is formed between the inclined surface 3b of the receiving portion 3 and the outer peripheral surface 1d of the pushing portion 1a, and the inner peripheral surface of the pusher wheel 13 and the insertion portion 23 are formed. A rear seal portion 7 is formed between the outer peripheral surface 23a. Here, between the inclined surface 3b of the receiving portion 3 and the outer peripheral surface 1d of the pushing portion 1a, the insertion portion 23 moves relative to the receiving portion 3 in the tube axis direction, that is, in the direction of the white arrow in the figure. When this occurs, the sealing property between the parallel surface 3d of the receiving port 3 and the outer peripheral surface 23a of the insertion port 23 is not maintained by the leading seal portion 1b, and the fluid in the tubes 2, 22 It flows between the inclined surface 3b of the receiving portion 3 and the outer peripheral surface 1d of the pushing portion 1a through the space between the seal portion 1b and the parallel surface 3d of the receiving portion 3, and finally flows into the gap S. Then, the inner peripheral surface T is pressed toward the inclined surface 3b by the fluid flowing into the gap S, and the lip portion R expands and comes into contact with the inclined surface 3b of the receiving portion 3. The sealing between the outer peripheral surface 1d of the pushing portion 1a and the inclined surface 3b of the receiving portion 3 can be maintained.

  Therefore, since the lip portion R and the rear seal portion 7 are formed in addition to the top seal portion 1b as described above, an unexpected external force is generated due to, for example, an earthquake or the like, and the insertion portion 23 becomes the receiving portion. The relative movement of detaching a predetermined length in the tube axis direction with respect to 3 occurs, and the sealing property between the parallel surface 3d of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23 is not maintained by the leading seal portion 1b. Even in this state, the lip portion R receives the fluid in the direction in which the lip R is about to leak out by the fluid of the tubular bodies 2 and 22 flowing between the parallel surface 3d of the receiving portion 3 and the outer peripheral surface 1d of the pushing portion 1a. By being pressed against the inclined surface 3b of the portion 3, the sealing between the outer peripheral surface 1d of the pushing portion 1a and the inclined surface 3b of the receiving portion 3 is maintained. Further, due to the rear seal portion 7 that seals between the inner peripheral surface of the press wheel 13 and the outer peripheral surface 23a of the insertion portion 23, it is still between the inner peripheral surface of the press wheel 13 and the outer peripheral surface 23a of the insertion portion 23. Sealing can be maintained, and as a result, fluid leakage from the pipe bodies 2 and 22 can be prevented.

  In particular, as shown in FIG. 3, even if extreme relative movement occurs in which the end surface 3 a of the receiving portion 3 and the end surface 23 b of the insertion portion 23 are separated in the tube axis direction, the rear seal portion 7 is sealed. As long as it is done, the sealing of the tubes 2 and 22 can be maintained.

  In this embodiment, when the relative movement in which the insertion portion 23 is detached from the receiving portion 3 by a predetermined length in the tube axis direction as shown in FIG. If the portion R is pressed against the inclined surface 3b of the receiving portion 3 and the sealing between the outer peripheral surface 1d of the pushing portion 1a and the inclined surface 3b of the receiving portion 3 is maintained, it is shown in FIG. In such a normal state, the lip R may not contact the inclined surface 3 b of the receiving port 3.

  Furthermore, as shown above in the pusher wheel 13 of the present embodiment, the inner peripheral surface of the pusher wheel 13 has a tapered surface 13e that decreases in diameter from the end surface 3a side of the receiving port 3 toward the outer side in the tube axis direction. Is formed.

  By doing in this way, the packing 1 can be auxiliary-pressed in the tube-axis direction toward the inside of the receiving portion 3 by using the tapered surface 13e formed on the inner peripheral surface of the pusher wheel 13. In addition, the rear seal portion 7 can be pressed toward the outer peripheral surface 23a of the insertion portion 23 in a direction perpendicular to the tube axis.

  Moreover, in the said Example, the back seal part 7 is integrally integrated so that the back seal part 7 may bulge toward the outer peripheral surface 23a of the insertion part 23 and the inner peripheral surface of the press ring 13 at the edge part of the extension part 1f. However, the present invention is not limited to this, and a rear seal portion that bulges toward the inner peripheral surface of the press wheel 13 facing the outer peripheral surface 1d of the extending portion 1f on the outer peripheral surface 1d of the extending portion 1f, Even if the inner peripheral surface 1e of the extending portion 1f is independently provided with a rear seal portion that bulges toward the outer peripheral surface 23a of the insertion portion 23 that faces the inner peripheral surface 1e of the extending portion 1f. Good.

  By doing in this way, the back seal part is formed in the outer peripheral surface 1d of the extension part 1f and the inner peripheral surface 1e of the extension part 1f, respectively, so that the extension part extends from the inner peripheral surface of the presser wheel 13. The force toward 1f is received by the rear seal portion formed on the outer peripheral surface 1d of the extending portion 1f, and this force is effectively applied to the insertion portion 23 from the rear seal portion formed on the inner peripheral surface 1e of the extended portion 1f. By acting on the outer peripheral surface 23a, the sealing between the inner peripheral surface 1e of the extending portion 1f and the outer peripheral surface 23a of the insertion portion 23 can be maintained as a result.

  Further, not limited to the above, a rear seal portion is formed on the outer peripheral surface 1d of the extending portion 1f of the packing 1 so as to bulge toward the inner peripheral surface of the push ring 13 facing the outer peripheral surface 1d of the extending portion 1f. It may be only. Although not particularly illustrated, a rear seal portion that bulges toward the outer peripheral surface 23a of the insertion portion 23 facing the inner peripheral surface 1e of the extending portion 1f on the inner peripheral surface 1e of the extending portion 1f of the packing 1. May be formed.

  By doing so, even if an unexpected external force due to, for example, an earthquake or the like occurs, and the relative movement in which the insertion portion 23 is detached from the receiving portion 3 by a predetermined length in the tube axis direction occurs, the leading seal portion In addition to 1b, the rear seal portion that seals between the inner peripheral surface 1e of the extension portion 1f and the outer peripheral surface 23a of the insertion portion 23 is still the inner peripheral surface 1e of the extension portion 1f and the insertion portion 23. It is possible to maintain a seal with the outer peripheral surface 23a.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is. Below, it relates to the pipe joint of the modification in the Example of this invention, and demonstrates with reference to FIG. 4 thru | or FIG. It should be noted that the same components as those shown in the above-described embodiment are denoted by the same reference numerals and redundant description is omitted.

  As shown in FIG. 4A as the first modification, the lip R of the packing 1 is formed along the circumferential direction of the outer peripheral surface 1d of the pushing portion 1a in the vicinity of the end surface 3a of the receiving portion 3. Yes. Then, a plurality of T-head bolts 11 are inserted in the circumferential direction in the packing portion 1 and the flange portions 3g and 13b of the press ring 13 and the nuts 12 are screwed in to close the packing 1 in the same direction. 4 (b), the outer peripheral surface 1d of the extending portion 1f of the packing 1 is pressed by the tapered surface 13e of the pusher wheel 13 in the direction of the white arrow in the drawing, and the packing 1 It is pushed inward of the part 3. The leading seal portion 1b of the packing 1 is elastically deformed by coming into contact with the inclined surface 3b of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23, and the leading seal portion 1b of the packing 1 is further received by the receiving portion 3. The leading seal portion 1b is fitted between the parallel surface 3d and the outer peripheral surface 23a of the insertion opening 23 by contacting the parallel surface 3d of the insertion opening 23 and the outer peripheral surface 23a of the insertion opening 23, and finally the leading seal portion 1b. The tip is pushed in until it comes into contact with the back end surface 3f. As a result, the space between the parallel surface 3d and the outer peripheral surface 23a of the insertion portion 23 is sealed by the head seal portion 1b.

  On the other hand, the rear seal portion 7 formed at the left end of the extending portion 1f is pressed by the tapered surface 13e of the pusher wheel 13 in the direction of the white arrow in the drawing, and the rear seal part 7 of the packing 1 is pushed by the pusher wheel. 13 is contacted with the taper surface 13e and the outer peripheral surface 23a of the insertion portion 23, and the rear seal portion 7 of the packing 1 is in contact with the parallel surface 13g of the push ring 13 and the outer peripheral surface 23a of the insertion portion 23. The back seal portion 7 is fitted between the parallel surface 13g and the outer peripheral surface 23a of the insertion portion 23 by being in contact with each other, so that the rear end portion of the rear seal portion 7 finally comes into contact with the rear end surface 13f of the presser wheel 13. 1 is pressed by the pusher wheel 13. As a result, the space between the parallel surface 13 g of the push wheel 13 and the outer peripheral surface 23 a of the insertion portion 23 is supplementarily sealed by the rear seal portion 7.

  Further, as shown in FIG. 4C, when the outer peripheral surface 1d of the extending portion 1f is further pressed by the tapered surface 13e of the pusher wheel 13 in the direction of the white arrow in the drawing, the inclination of the receiving portion 3 is increased. It is inserted between the surface 3 b and the outer peripheral surface 23 a of the insertion portion 23. Therefore, the lip R of the packing 1 is formed along the circumferential direction 1d on the outer peripheral surface 1d of the pushing portion 1a in the vicinity of the end surface 3a of the receiving portion 3. Since the lip portion R does not contact the inclined surface 3b of the receiving portion 3 until the seal portion R seals between the parallel surface 3d of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23, the packing 1 is Easy to install.

  When an unexpected external force occurs due to an earthquake or the like, as shown in FIG. 5, the insertion portion 23 moves relative to the receiving portion 3 in the tube axis direction, that is, in the direction of the white arrow in the figure, and elastically deforms. Since the leading seal portion 1b of the packing 1 is restored to the original natural state, the sealing performance between the parallel surface 3d of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23 is not maintained.

  However, since the lip portion R and the rear seal portion 7 are formed in addition to the leading seal portion 1b as described above, an unexpected external force is generated due to, for example, an earthquake or the like, and the insertion portion 23 becomes the receiving portion 3. In this state, relative movement that desorbs a predetermined length in the tube axis direction occurs, and the sealing property between the parallel surface 3d of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23 is not maintained by the leading seal portion 1b. Even in this case, the lip portion R in the direction in which the lip R is about to leak out by the fluid of the pipe bodies 2 and 22 flowing between the parallel surface 3d of the receiving portion 3 and the outer peripheral surface 1d of the pushing portion 1a. 3 is pressed against the inclined surface 3b, and the sealing between the outer peripheral surface 1d of the pushing portion 1a and the inclined surface 3b of the receiving portion 3 is maintained. Further, the rear seal portion 7 that seals between the inner peripheral surface of the press wheel 13 and the outer peripheral surface 23 a of the insertion portion 23 is still between the inner peripheral surface of the press wheel 13 and the outer peripheral surface 23 a of the insertion portion 23. As a result, leakage of the fluid flowing through the pipe bodies 2 and 22 can be prevented.

  In particular, as shown in FIG. 5, even if extreme relative movement occurs in which the end surface 3a of the receiving portion 3 and the end surface 23b of the insertion portion 23 are separated in the tube axis direction, the rear seal portion 7 is sealed. As long as it is done, the sealing of the tubes 2 and 22 can be maintained.

  As a second modification, as shown in FIG. 6, three lip portions Ra, Rb, Rc may be formed in a sawtooth shape in cross section on the outer peripheral surface 1 d of the pushing portion 1 a, and although not particularly shown, Two or four or more lip portions may be formed on the outer peripheral surface 1d of the portion 1a.

  Thus, even if unexpected external force arises, the sealing performance of both the tubular bodies 2 and 22 can be improved by forming a plurality of lip portions in the tube axis direction.

  Furthermore, as a second modification, as shown in FIG. 7, two rear seal portions 17a and 17b are formed on the outer peripheral surface 1d of the extending portion 1f, and the rear seal is formed on the inner peripheral surface 1e of the extended portion 1f. Two sections 18a and 18b may be formed. The above two strips are formed on the outer peripheral surface 1d of the extended portion 1f with two rear seal portions that bulge toward the inner peripheral surface of the press wheel 13 that faces the outer peripheral surface 1d of the extended portion 1f. In the sense that two rear seal portions that bulge toward the outer peripheral surface 23a of the insertion portion 23 facing the inner peripheral surface 1e of the extending portion 1f are formed on the inner peripheral surface 1e of the extending portion 1f. is there. Although not particularly illustrated, three or more rear seal portions may be formed on the outer peripheral surface 1d of the extended portion 1f and the inner peripheral surface 1e of the extended portion 1f. Further, although not particularly illustrated, a plurality of rear seal portions may be formed on the outer peripheral surface 1d of the extending portion 1f, and similarly, a plurality of rear seal portions are formed on the inner peripheral surface 1e of the extended portion 1f. You may only have.

  Thus, even if unexpected external force arises, the sealing performance of both the tubular bodies 2 and 22 can be improved because the back seal | sticker part is formed in multiple numbers by the pipe-axis direction.

It is a disassembled perspective view which shows the whole image of the pipe joint in the Example of this invention. (A) is a partial cross section figure which shows the pipe joint before packing installation, (b) is a partial cross section figure which shows the pipe joint after packing installation. It is a partial cross section figure which shows a pipe joint when the relative movement which the insertion part detaches | leaves in a pipe-axis direction with respect to the receiving part occurred. (A) is a partial cross-sectional view showing a pipe joint before the packing is attached in the pipe joint of Modification 1, (b) is a partial cross-sectional view showing a pipe joint at an intermediate stage of the packing attachment, and (c) is a packing. It is a partial cross section figure which shows the pipe joint after attachment. It is a partial cross section figure which shows a pipe joint when the relative movement which the insertion part detaches | leaves in a pipe-axis direction with respect to the receiving part has occurred. FIG. 9 is a partial cross-sectional view showing a pipe joint packing according to Modification 2. FIG. 10 is a partial cross-sectional view showing a pipe joint packing according to Modification 3. (A) is a partial cross section figure which shows the pipe joint of the prior art example before packing installation. (B) is a partial cross section figure which shows the pipe joint of the prior art example after packing installation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packing 1a Pushing part 1b Lead seal part 1d Outer peripheral surface 1e Inner peripheral surface 1f Extension part 2 Tubing body 3 Receiving part 3a End surface 3b Inclined surface 3d Parallel surface 3f Back end surface 3g Flange part 3h Mounting hole 7 Back seal part 11T Head bolt (mounting member)
12 Nut (mounting member)
13 Pressing wheel 13a Annular pressing part 13b Flange part 13d Mounting hole 13e Tapered surface (inner peripheral surface of the pressing wheel)
13f Back end surface 13g Parallel surface (Inner peripheral surface of the pusher wheel)
17a rear seal portion 17b rear seal portion 18a rear seal portion 18b rear seal portion 22 tube 23 insertion portion 23a outer peripheral surface 23b end surface R lip portion Ra lip portion Rb lip portion Rc lip portion S gap T inner peripheral surface U outer peripheral surface

Claims (3)

An insertion portion constituting one tube,
An inclined surface that is loosely inserted into the insertion portion and has an inner peripheral surface with a diameter that decreases inward from the end surface side, and a tube axis that is formed continuously inward from the inclined surface. A receiving part that constitutes the other tubular body having a substantially parallel parallel plane,
It is made of an elastic material formed in a ring shape, and is disposed between the inner peripheral surface of the receiving portion and the outer peripheral surface of the insertion portion, and is located between the inclined surface and the outer peripheral surface of the insertion portion. A packing having a pushing portion and a leading seal portion formed continuously with the pushing portion for sealing between the parallel surface and the outer peripheral surface of the insertion portion;
A press ring that is fitted along the outer peripheral surface of the insertion portion and presses the packing;
In a pipe joint comprising: an attachment member attached in linkage with the receptacle and the push ring so that relative movement of the receptacle, the push ring, and the packing in the tube axis direction is restricted. ,
The press ring has an inner peripheral surface facing an outer peripheral surface of the insertion portion,
The packing is
An extended portion that extends continuously from the pushing portion in the tube axis direction on the side opposite to the leading seal portion and is located between the inner peripheral surface of the push ring and the outer peripheral surface of the insertion portion,
A rear seal portion that is formed in the extending portion and seals between an inner peripheral surface of the press ring and an outer peripheral surface of the insertion portion;
A pipe joint comprising a lip portion formed on an outer peripheral surface of the pushing portion and having a thickness gradually decreasing toward the leading seal portion side along the circumferential direction.   2. The pipe joint according to claim 1, wherein the lip portion is formed on the outer peripheral surface of the pushing portion in the vicinity of the end surface of the receiving portion.   The pipe joint according to claim 1, wherein a plurality of the lip portions are formed on the outer peripheral surface of the pushing portion.

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