JP2008196608A - 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 a clamped part 1g formed on the outer peripheral surface 1d of a push part 1a so as to be clamped between a pressing surface 13c of the pressing ring 13 and the socket part 3, 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, and a rear seal part 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. The clamped part 1g, the extension part 1f and the rear seal part 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 seal having a leading seal portion for sealing between the outer peripheral surface of the insertion portion, and a press ring having a pressing surface that is fitted along the outer peripheral surface of the insertion portion and presses the packing. An attachment member attached in linkage with the receiving portion and the push ring so that the relative movement of the receiving portion, the push ring and the packing in the tube axis direction is restricted. It was related to the pipe joint.

  Conventionally, a packing 101 as shown in FIG. 9 has been used as means for preventing leakage of a fluid flowing into a pipe from a joint portion of a pipe in which two pipe bodies are fastened by a push ring (see, for example, Patent Document 1). Hereinafter, the packing 101 illustrated in FIG. 9 will be described. That is, in FIG. 9A, 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 wheel 113, and the nut 112 is screwed in and closed evenly. 9B, 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 has a pressing surface that is externally 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
A to-be-compressed portion formed on the outer peripheral surface of the push-in portion and sandwiched between the pressing surface of the push wheel and the receiving portion;
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 formed in the extending portion and sealing between the inner peripheral surface of the push wheel and the outer peripheral surface of the insertion portion is provided along the circumferential direction.
According to this feature, in addition to the leading seal portion, the sandwiched pressure portion and the rear seal portion are formed, so that an unexpected external force is generated due to, for example, an earthquake, and the insertion portion is connected to the receiving portion. Even if a relative movement that detaches by a predetermined length occurs in the axial direction, the pressed portion between the pressing surface of the press wheel and the receiving portion, and the inner peripheral surface of the press wheel and the outer peripheral surface of the insertion portion The sealing of the tube is still maintained by the rear seal. 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 pressing surface of the press ring faces the inclined surface of the receiving portion, and the pressed portion of the packing is pressed between the pressing surface of the pressing wheel and the inclined surface of the receiving portion. It is characterized by that.
According to this feature, not only can the leading seal portion of the packing be easily pushed into an appropriate position by the pressing surface of the press ring facing the inclined surface of the receiving portion, but also the pressing surface of the press ring and the inclined surface of the receiving portion. Thus, it is possible to clamp the pressed portion of the packing.

The pipe joint according to claim 3 of the present invention is the pipe joint according to claim 2,
The pressing surface of the push ring extends inward of the receiving portion toward the inclined surface of the receiving portion.
According to this feature, since the pressing surface of the press wheel can be extended to the vicinity of the inclined surface of the receiving portion, the holding pressure of the pressed portion of the packing is increased, and the outer peripheral surface of the packing and the inclined surface of the receiving portion are The sealing between can be improved.

A pipe joint according to a fourth aspect of the present invention is the pipe joint according to the first aspect,
The pressing surface of the press ring faces the end surface of the receiving portion, and the pressed portion of the packing is pressed between the pressing surface of the press ring and the end surface of the receiving portion. It is a feature.
According to this feature, since the to-be-clamped part of the packing is exposed at a position on the outer side of the receiving part, the sealed state by the to-be-clamped part can be confirmed.

The pipe joint according to claim 5 of the present invention is the pipe joint according to any one of claims 1 to 4,
A bulging portion that bulges toward the receiving port side is formed in the sandwiched pressure portion of the packing.
According to this feature, since the bulging portion that bulges toward the receiving portion is formed in the pinched pressure portion of the packing, the pinching pressure that acts on the pinched pressure portion is concentrated on the bulging portion. It is possible to improve the sealing performance between the outer peripheral surface of the packing and the receiving portion at the bulging portion.

A pipe joint according to a sixth aspect of the present invention is the pipe joint according to any one of the first to fifth aspects,
The rear seal portion is formed on an outer peripheral surface of the extended portion and an inner peripheral surface of the extended portion.
According to this feature, even if an unexpected external force occurs due to, for example, an earthquake or the like, and the relative movement in which the insertion portion is detached from the receiving portion in the tube axis direction by a predetermined length occurs, The rear seal portion formed on the outer peripheral surface of the extension portion receives a force toward the extension portion, and this force is effectively transferred from the rear seal portion formed on the inner peripheral surface of the extension portion to the outer peripheral surface of the insertion portion. As a result, the sealing between the inner peripheral surface of the extending portion and the outer peripheral surface of the insertion portion is maintained.

A pipe joint according to a seventh aspect of the present invention is the pipe joint according to any one of the first to sixth aspects,
A plurality of rear seal portions are formed on at least one of the outer peripheral surface of the extended portion and the inner peripheral surface of the extended 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 back seal 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. FIG. 4 is a partial cross-sectional view showing the packing of the pipe joint in the first modification. FIG. 5 is a partial cross-sectional view showing the packing of the pipe joint in the second modification. FIG. 6 is a partial cross-sectional view showing the packing of the pipe joint in the third modification. FIG. 7A is a partial cross-sectional view showing the packing of the pipe joint before the packing is attached in Modification 4, FIG. 7B is a partial cross-sectional view showing the pipe joint in the middle stage of the packing attachment, and FIG. It is a partial cross section figure which shows the pipe joint after packing attachment. FIG. 8 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.

  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. A plurality of mounting holes 13d formed in the flange portion 13b of the pusher wheel 13 are provided in the circumferential direction at predetermined intervals so as to be coaxial with the mounting hole 3h of the flange portion 3g of the receiving portion 3.

  The T-head bolt 11 and the nut 12 as mounting members are attached to the mounting holes 3h of the flange 3g of the receiving port 3 and the mounting holes 13d of the flange 13b of the press ring 13 according 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, at the end of the pushing portion 1a on the left side of the sheet of FIG. 2A, a pressed surface 1c, which is an end surface pressed by the push ring 13, is directed toward the inclined surface 3b of the receiving portion 3. It is formed so as to extend inward, and a pressed portion 1g to which the pressed surface 1c and the outer peripheral surface 1d of the pressing portion 1a are pressed is formed on the outer peripheral surface of the pressing portion 1a. And the bulging part 9 which bulges toward the inclined surface 3b of the receiving part 3 facing the outer peripheral surface 1d of the pushing part 1a is formed in the pinched part 1g along the circumferential direction.

  On the left side of the pushing portion 1a in FIG. 2 (a), the pushing portion 1a extends continuously from the pushing portion 1a in the tube axis direction on the side opposite to the leading seal portion 1b. An extending portion 1f located between the outer peripheral surface 23a and the outer peripheral surface 23a is formed along the circumferential direction. Further, the end of the extended portion 1f on the left side of FIG. 2A faces the outer peripheral surface 1d of the extended portion 1f and the inner peripheral surface of the press ring 13 facing the outer peripheral surface 1d of the extended portion 1f. The rear seal portion 7 bulging 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 pressing 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 inclined surface 3b of the receiving portion 3. In addition, a pressing surface 13 c is formed so as to extend inward of the receiving portion 3 toward the inclined surface 3 b of the receiving portion 3. 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 pressed surface 1c of the packing 1 is pressed in the direction of the white arrow in the figure by the pressing surface 13c of the press wheel 13, and the packing 1 is directed inward of the receiving portion 3. It is pushed. 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 bulging part 9 formed in the clamped part 1g of the packing 1 is pressed in the tube axis direction by the pusher wheel 13, and this bulging part 9 comes into contact with the inclined surface 3b of the receiving part 3. It is elastically deformed and is pushed between the inclined surface 3 b of the receiving port 3 and the outer peripheral surface 23 a of the insertion port 23. At this time, the force in the direction of the black arrow in FIG. 2B is transmitted from the pressing surface 13c of the pressing wheel 13 to the bulging portion 9 toward the outer peripheral surface 23a of the insertion portion 23 by the pressing of the pressing wheel 13. Since the bulging portion 9 acts on the inclined surface 3 b of the receiving portion 3, the pinched portion 1 g of the packing 1 is pressed between the pressing surface 13 c of the press wheel 13 and the inclined surface 3 b of the receiving portion 3. Is done. Therefore, in addition to the leading seal portion 1b, the bulging portion 9 supplementarily seals between the outer peripheral surface 1d of the pushing portion 1a and the inclined surface 3b of the receiving portion 3.

  Further, the rear seal portion 7 formed at the end of the extending portion 1f on the left side of FIG. 2B is pressed toward the direction of the white arrow in the drawing by the tapered surface 13e of the presser wheel 13, and the back of the packing 1 The seal portion 7 is elastically deformed by coming into contact with the tapered surface 13e of the pusher wheel 13 and the outer peripheral surface 23a of the insertion portion 23. Further, the rear seal portion 7 of the packing 1 is formed between the parallel surface 13g of the pusher wheel 13 and the insertion portion 23. By contacting the outer peripheral surface 23a, the rear seal portion 7 is fitted between the parallel surface 13g and the outer peripheral surface 23a of the insertion portion 23. Finally, the rear end portion of the rear seal portion 7 is the rear end surface 13f of the pusher wheel 13. The packing 1 is pressed by the pusher wheel 13 so as to come into contact with. 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 is generated due to an earthquake or the like, as shown in FIG. 3, the insertion portion 23 is moved relative to the receiving portion 3 in the tube axis direction, that is, in the direction of the white arrow in the figure, and elastic. Since the leading seal portion 1b of the deformed 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, as shown above, in addition to the leading seal portion 1b, a pinched portion 1g 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 pusher wheel 13 The rear seal portion 7 is formed between the inner peripheral surface of the inner peripheral surface and the outer peripheral surface 23 a of the insertion portion 23. Here, between the inclined surface 3b of the receiving portion 3 and the outer peripheral surface 1d of the pushing portion 1a, the pressing surface 13c of the push wheel 13 faces the inclined surface 3b of the receiving portion 3, and the pinched portion 1g Is pressed between the pressing surface 13c of the push wheel 13 and the inclined surface 3b of the receiving portion 3, and therefore, the inclined surface 3b of the existing receiving portion 3 is used to press the inclined surface 3b and the pressing wheel 13. The pressed portion 1g of the packing can be clamped by the surface 13c, and 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.

  Further, the bulging portion 9 that bulges toward the inclined surface 3 b of the receiving portion 3 is formed in the sandwiched pressure portion 1 g of the packing 1, so that the bulging from the pressing surface 13 c of the pressing wheel 13 is caused by the pressing of the pressing wheel 13. A force in the direction of the black arrow in FIG. 3 is transmitted to the protruding portion 9 toward the outer peripheral surface 23 a of the insertion portion 23, and this force is applied to the inclined surface 3 b of the receiving portion 3 by the bulging portion 9. Therefore, the pinching force acting on the pinched portion 1g can be concentrated on the bulging portion 9, and as a result, the sealing performance between the outer peripheral surface 1d of the pushing portion 1a and the inclined surface 3b of the receiving portion 3 is improved. be able to.

  Therefore, as shown above, in addition to the leading seal portion 1b, the pinched pressure portion 1g and the rear seal portion 7 are formed, so that an unexpected external force due to, for example, an earthquake or the like occurs, and the insertion portion 23 is Even if a relative movement that desorbs a predetermined length in the tube axis direction with respect to the receiving port 3 occurs, the clamped portion 1g between the pressing surface 13c of the pressing wheel 13 and the receiving port 3 and the inside of the pressing wheel 13 The sealing of the tubes 2 and 22 can still be maintained by the rear seal portion 7 between the peripheral surface and the outer peripheral surface 23a of the insertion portion 23.

  In particular, as shown in FIG. 3, the extreme relative movement between the receiving portion 3 and the insertion portion 23 is such that 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. Even if it happens, as long as the rear seal portion 7 is sealed, the sealing of the tubes 2 and 22 can be maintained.

  In the pusher wheel 13 of the present embodiment, as described above, the pressing surface 13c of the pusher wheel 13 is opposed to the inclined surface 3b of the receiving portion 3, and the pressed portion 1g of the packing 1 is Is pressed between the pressing surface 13 c and the inclined surface 3 b of the receiving portion 3. (See FIGS. 2 and 3).

  By doing in this way, not only can the leading seal portion 1b of the packing 1 be easily pushed into an appropriate position by the pressing surface 13c of the pressing wheel 13 opposed to the inclined surface 3b of the receiving portion 3, but also the pressing wheel 13 The pressed portion 1g of the packing 1 can be clamped by the pressing surface 13c and the inclined surface 3b of the receiving portion 3.

  Further, the pressing surface 13c of the push wheel 13 extends inward of the receiving portion 3 toward the inclined surface 3b of the receiving portion 3 (see FIGS. 2 and 3).

  By doing in this way, since the pressing surface 13c of the press ring 13 can be extended to the vicinity of the inclined surface 3b of the receiving part 3, the clamping pressure of the clamping part 1g of the packing 1 increases, and the outer peripheral surface of the packing 1 Sealing between 1d and the inclined surface 3b of the receiving port 3 can be improved.

  Furthermore, a tapered surface 13e is formed on the inner peripheral surface of the pusher wheel 13 to reduce the diameter from the end surface 3a side of the receiving portion 3 toward the outside in the tube axis direction.

  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.

  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. Hereinafter, a modification of the pipe joint according to the embodiment of the present invention will be described with reference to FIGS. 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.

  For example, in the above embodiment, the rear seal portion is integrally formed so that the rear seal portion 7 bulges toward the outer peripheral surface 23a of the insertion portion 23 and the inner peripheral surface of the press wheel 13 at the end of the extending portion 1f. However, the present invention is not limited to this, and as a first modification, as shown in FIG. 4, only the rear seal portion 7 a may be formed on the outer peripheral surface 1 d of the extending portion 1 f of the packing 1. Although not shown in particular, the rear seal portion may be formed only on the inner peripheral surface 1 e of the extending portion 1 f of the packing 1.

  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.

  Further, although not particularly illustrated, a rear seal portion that bulges toward the inner peripheral surface of the press wheel 13 that faces the outer peripheral surface 1d of the extended portion 1f, and the extended portion 1f, on the outer peripheral surface 1d of the extended portion 1f. 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 may be independently provided on the inner peripheral surface 1e.

  As described above, the rear seal portions are formed on the outer peripheral surface 1d of the extending portion 1f and the inner peripheral surface 1e of the extending portion 1f, so that the inner peripheral surface of the pusher wheel 13 is directed to the extending portion 1f. The rear seal portion formed on the outer peripheral surface 1d of the extending portion 1f receives the force, and this force is effectively transmitted from the rear seal portion formed on the inner peripheral surface 1e of the extended portion 1f to the outer peripheral surface 23a of the insertion portion 23. As a result, the sealing between the inner peripheral surface 1e of the extended portion 1f and the outer peripheral surface 23a of the insertion portion 23 can be maintained.

  As a second modification, two rear seal portions 7b and 7c are formed on the outer peripheral surface 1d of the extended portion 1f, and two rear seal portions 8b and 8c are formed on the inner peripheral surface 1e of the extended portion 1f. May be. 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. It means 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 doing. 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. It may be only.

  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.

  Moreover, in the said Example, although the bulging part 9 which bulges toward the receptacle part 3 side is formed in the to-be-clamped part 1g, it is shown in FIG. Thus, the bulging portion 9 may not be formed in the sandwiched pressure portion 1g of the packing 1.

  This is because even if the bulging portion is not formed in the pressed portion 1g, the pressed portion 1g of the packing 1 can be pressed by the inclined surface 3b of the receiving portion 3 and the pressing surface 13c of the press wheel 13. This is because 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.

  As shown in FIG. 7 as modified example 4, the pressing surface 13c of the pusher wheel 13 is formed so as to face the end surface 3a of the receiving portion 3 formed in a direction substantially orthogonal to the tube axis. 13 has a tapered surface 13e that opposes the outer peripheral surface 1d of the extending portion 1f and that decreases in diameter from the end surface 3a side of the receiving port portion 3 outward in the tube axis direction. . The pressing portion 1a is formed with a pressed portion 1g so as to be pressed between the pressing surface 13c of the press wheel 13 and the end surface 3a of the receiving portion 3. The pressed portion 1g A bulging portion 9 that bulges toward the end surface 3a side of the receiving portion 3 and a pressed surface 1c that faces the pressing surface 13c of the press wheel 13 are formed (see FIG. 7A).

  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 presser wheel 13 in the circumferential direction, and nuts 12 are screwed in and closed evenly in the same direction, FIG. As shown in (b), the pressed surface 1c is pressed by the pressing surface 13c of the press wheel 13 in the direction of the outlined arrow, and the packing 1 is pressed inward of the receiving portion 3. . At this time, the leading seal portion 1b of the packing 1 is fitted between the parallel surface 3d of the receiving portion 3 and the outer peripheral surface 23a of the insertion portion 23, and the parallel surface 3d of the receiving portion 3 is inserted by the leading seal portion 1b. And the outer peripheral surface 23a of the insertion portion 23 are sealed. On the other hand, the rear seal portion 7 formed at the end of the extending portion 1f on the left side of the drawing is pressed by the tapered surface 13e of the pusher wheel 13 in the direction of the white arrow in the drawing, and the parallel surface 13g of the pusher wheel 13 and the insertion port are inserted. It is inserted between the outer peripheral surface 23 a of the part 23. As a result, in addition to the leading seal portion 1b, the rear seal portion 7 supplementarily seals the space between the parallel surface 13g of the pusher wheel 13 and the outer peripheral surface 23a of the insertion portion 23.

  Then, as shown in FIG. 7C, when the pressed surface 1 c is pressed by the pressing surface 13 c of the press wheel 13 further toward the illustrated white arrow direction, the pressing surface of the press wheel 13 is pressed by the press wheel 13. 13c is transmitted to the bulging portion 9 toward the outer peripheral surface 23a of the insertion portion 23 in the direction of the tube axis, that is, in the direction of the black arrow in the figure, and this force is transmitted to the end surface 3a of the receiving portion 3 by the bulging portion 9. Because of this action, the pinched portion 1 g is pinched between the pressing surface 13 c of the press wheel 13 and the end surface 3 a of the receiving portion 3. Therefore, in addition to the leading seal portion 1b, the bulging portion 9 supplementarily seals between the outer peripheral surface 1d of the pushing portion 1a and the end surface 3a of the receiving portion 3.

  When an unexpected external force is generated due to an earthquake or the like, as shown in FIG. 8, the insertion portion 23 moves relative to the receiving portion 3 in the direction of the white arrow in the figure, and the packing has been elastically deformed. Since one leading seal portion 1b is restored to its original natural state, 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.

  However, in addition to the leading seal portion 1b, the pinched portion 1g and the rear seal portion 7 are formed, so that an unexpected external force is generated due to an earthquake or the like, and the insertion portion 23 is connected to the receiving portion 3 by a tube. Even if a relative movement that desorbs by a predetermined length occurs in the axial direction, the pressed portion 1g formed between the pressing surface 13c of the press wheel 13 and the receiving portion 3, the inner peripheral surface of the press wheel 13, and the insertion port The sealing of the tubular bodies 2 and 22 is still maintained by the rear seal portion 7 formed between the outer peripheral surface 23a of the portion 23.

  In addition, by using the end surface 3a of the existing receiving port 3 that is substantially orthogonal to the tube axis direction, not only the pressure-bonded portion 1g of the packing 1 can be clamped by the end surface 3a and the pressing surface 13c of the press wheel 13, Since the pressing direction acting on the packing 1 by the pressing surface 13c of the press wheel 13 and the pressing direction acting on the pressed portion 1g are the same tube axis direction, the pressing force is effectively applied to the pressed portion 1g. Available to: Further, as described above, the swelled portion 9 that bulges toward the end surface 3a of the receiving portion 3 is formed in the squeezed pressure portion 1g of the packing 1, thereby acting on the squeezed pressure portion 1g. The pinching force can be concentrated on the bulging portion 9, and as a result, the sealing performance between the outer peripheral surface 1 d of the pushing portion 1 a and the end surface 3 a of the receiving portion 3 can be enhanced.

  In particular, as shown in FIG. 8, an extreme relative movement occurs such that 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, and the receiving portion 3 and the insertion portion 23 are thus separated. Even if the detachment state occurs, the sealing of the tubular bodies 2 and 22 can be maintained.

  As described above in Modification 4, the pressing surface 13c of the pusher wheel 13 is opposed to the end surface 3a of the receiving portion 3, and the clamped pressure part 1g of the packing 1 is the pressing surface 13c of the pusher wheel 13. And the end surface 3 a of the receiving portion 3.

  By doing in this way, since the to-be-clamped part 1g of the packing 1 is exposed to the position of the outer side of the receiving part 3, the sealing state by the to-be-clamped part 1g can be confirmed.

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. FIG. 9 is a partial cross-sectional view showing a pipe joint packing in Modification 1; 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-sectional view showing the packing of the pipe joint before the packing is attached in the modified example 4, (b) is a partial cross-sectional view showing the pipe joint at an intermediate stage of the packing attachment, and (c) is the packing attachment. It is a partial sectional view showing the rear pipe joint. 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 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-in part 1b Lead seal part 1c Pressed surface 1d Outer peripheral surface 1e Inner peripheral surface 1f Extension part 1g Clamping part 2 Tubular body 3 Receiving part 3a End surface 3b Inclined surface 3d Parallel surface 3f Deep end surface 3g Flange part 3h Mounting hole 7 Back seal portion 7a Back seal portion 7b Back seal portion 7c Back seal portion 8b Back seal portion 8c Back seal portion 9 Swelling portion 11 T head bolt (attachment member)
12 Nut (mounting member)
13 Press wheel 13a Annular pressing part 13b Flange part 13c Pressing surface 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)
22 Tube 23 Insert 23a Outer peripheral surface 23b End surface

Claims (7)

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 has a pressing surface that is externally 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
A to-be-compressed portion formed on the outer peripheral surface of the push-in portion and sandwiched between the pressing surface of the push wheel and the receiving portion;
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 pipe joint having a rear seal portion formed in the extended portion and sealing between the inner peripheral surface of the push wheel and the outer peripheral surface of the insertion portion along the circumferential direction. .   The pressing surface of the press ring faces the inclined surface of the receiving portion, and the pressed portion of the packing is pressed between the pressing surface of the pressing wheel and the inclined surface of the receiving portion. The pipe joint according to claim 1.   The pipe joint according to claim 2, wherein the pressing surface of the press ring extends inward of the receiving portion toward the inclined surface of the receiving portion.   The pressing surface of the press ring faces the end surface of the receiving portion, and the pressed portion of the packing is pressed between the pressing surface of the press ring and the end surface of the receiving portion. The pipe joint according to claim 1, wherein the pipe joint is characterized. The pipe joint according to any one of claims 1 to 4, wherein a bulging portion that bulges toward the receiving port side is formed in the sandwiched pressure portion of the packing.   The pipe joint according to any one of claims 1 to 5, wherein the rear seal portion is formed on an outer peripheral surface of the extended portion and an inner peripheral surface of the extended portion.   The pipe joint according to any one of claims 1 to 6, wherein a plurality of rear seal portions are formed on at least one of an outer peripheral surface of the extended portion and an inner peripheral surface of the extended portion.

Images