JP2015190569A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint allowing completion of connection of a pipe to a pipe join to be correctly determined.SOLUTION: A pipe joint 1 to which a pipe is connected, includes operating members 12, 13 which goes into an operable state when the pipe is inserted into a prescribed position in an inner hole of the pipe joint 1, and in which such a state that the connection of the pipe to the pipe joint can be completed is formed by the operation of the operating members. The pipe has a conductive part 31 having conductivity, and the operating members have conductive parts having conductivity. The operating members are disposed so that the conductive parts of the operating members are kept into contact with the conductive part of the pipe, when the operating members exist on the position to form such a state that the connection of the pipe to the pipe joint can be completed, and the pipe exists on a connection completion position to the pipe joint.

Description

  The present invention relates to a pipe joint to which a pipe is connected.

  Patent Document 1 describes a pipe joint 1 to which a flexible pipe 100 is connected (see FIG. 7). In this pipe joint, the guide member 42 is engaged with the joint body 2 by the slide member 43, and the movement of the guide member in the longitudinal axis direction of the joint body is suppressed. In this state, the guide member holds the compression coil spring 43 in a compressed state.

  When connecting a flexible pipe to a pipe joint, the flexible pipe is inserted into the inner hole 21 (see FIG. 1) of the pipe joint. When the flexible tube is moved in the inner hole in the tube insertion direction (the direction from the left side to the right side in FIG. 7), the tip of the corrugated tube 101 of the flexible tube contacts the slide member (see paragraph 0056).

  When the flexible tube is further moved in the tube insertion direction in the inner hole, the tip of the corrugated tube slides the slide member in the tube insertion direction (see FIG. 8). As a result, the engagement of the guide member with the joint body is released, and the guide member is moved in the tube pulling direction (the direction from the right side to the left side in the drawing) by the restoring force of the compression coil spring. Accordingly, the retainer 6 is also moved in the tube pulling direction via the “airtight packing 51, the guide 52, and the fireproof packing 53 (see FIG. 1)”. During this movement, the retainer moves in the tube pulling direction while the tapered surface 62a (see FIG. 1) of the retainer is in sliding contact with the tapered surface 31a (see FIG. 1) of the push nut 3. As a result, the retainer claw portion 63 (see FIG. 8) moves radially inward. Thereby, a nail | claw part engages with the trough part of a corrugated pipe | tube.

  In this state, when the flexible tube is pulled in the tube pulling direction, the push nut is moved in the tube pulling direction via the retainer (see FIG. 9). As a result, the indicator ring 10 is exposed to the outside from the joint body and moves to a position where it can be seen from the outside (see paragraph 0058). By visually observing the indicator ring 10, it is possible to confirm the completion of the connection of the flexible pipe to the pipe joint.

International Publication No. 2010/131609

  The inner diameter of the hermetic packing described in Patent Document 1 is smaller than the outer diameter of the corrugated pipe (the outer diameter of the peak) (see paragraph 0036). Therefore, the hermetic packing is in close contact with the corrugated tube. For this reason, if the flexible tube is pulled in the tube pulling direction before the slide member is slid in the tube insertion direction by the corrugated tube (that is, before the engagement of the guide member with the joint body is released), the corrugated tube There is a possibility that the hermetic packing is moved in the tube drawing direction.

  When the hermetic packing moves in the tube drawing direction, as described above, the retainer is moved in the tube drawing direction via the guide and the fireproof packing. Thereby, the nail | claw part of a retainer engages with a corrugated pipe in incomplete state. In this state, if the flexible tube is further pulled in the tube pulling direction, the push nut is moved in the tube pulling direction via the retainer, and as a result, the indicator ring may be exposed to the outside from the joint body. In this case, although the connection of the flexible pipe to the pipe joint is not completed, a state in which the indicator ring can be visually recognized from the outside is formed. For this reason, when it is determined that the connection of the flexible pipe to the pipe joint has been completed because the indicator ring can be visually recognized, the determination is an erroneous determination.

  Further, a seal member 9 is attached to the push nut (see FIG. 8). The member provides a watertight seal with the flexible tube (see paragraphs 0042 and 0043). That is, the seal member is in close contact with the flexible tube. For this reason, before the slide member is slid in the tube insertion direction by the corrugated tube, when the flexible tube is pulled in the tube pulling direction, the push nut is moved in the tube pulling direction via the seal member. The indicator ring may be exposed to the outside from the joint body. In this case, although the connection of the flexible pipe to the pipe joint is not completed, a state in which the indicator ring can be visually recognized from the outside is formed. Also in this case, the determination regarding the completion of the connection of the flexible pipe to the pipe joint is an erroneous determination.

  In particular, when the flexible tube is pulled in the tube drawing direction with the longitudinal center axis of the flexible tube being inclined with respect to the longitudinal center axis of the pipe joint, the flexible tube is more closely attached to the hermetic packing or the seal member. . For this reason, the possibility that the push nut is moved in the tube pulling direction through the hermetic packing or the seal member is increased.

  In addition, the push nut is not physically fixed to the joint body. For this reason, when an impact is applied to the push nut from the outside, the push nut may move in the tube pulling direction with respect to the joint body. Also in this case, the indicator ring is exposed to the outside from the joint body, and a state in which the indicator ring can be visually recognized from the outside is formed. Also in this case, the determination regarding the completion of the connection of the flexible pipe to the pipe joint is an erroneous determination.

  In view of such circumstances, an object of the present invention is to provide a pipe joint that can accurately determine the completion of connection of a pipe to the pipe joint.

  The present invention includes a pipe joint to which a pipe is connected, and includes an actuating member that is operable when the pipe is inserted to a predetermined position in an inner hole of the pipe joint. It is related with the pipe joint by which the state which can complete the connection of the said pipe | tube to the said pipe joint is formed.

  In the present invention, the tube has a conductive portion having conductivity, and the actuating member has a conductive portion having conductivity. Furthermore, when the actuating member is in a position that forms a state where the connection of the pipe to the pipe joint can be completed, and the pipe is in the connection completion position to the pipe joint, The actuating member is provided such that the portion is in contact with the conductive portion of the tube.

  According to this, only when the pipe is in the connection completion position to the pipe joint (that is, when the pipe has been connected to the pipe joint), the gap between the conductive part of the actuating member and the conductive part of the pipe is limited. A conductive state is formed. That is, when the connection of the pipe to the pipe joint is not completed, an electric conduction path is not formed between the conductive part of the operating member and the conductive part of the pipe. Therefore, it is possible to accurately determine the completion of the connection of the pipe to the pipe joint by confirming that a conductive state is formed between the conductive part of the operating member and the conductive part of the pipe.

  In addition, the pipe joint of this invention may be comprised so that the connection of the said pipe to the said pipe joint may be completed by moving the said pipe in the direction which pulls out the said pipe after the action | operation of the said operation member. Further, in the pipe joint of the present invention, the main body of the pipe joint has a conductive part having conductivity, and the operating member is located at a position where a state where the connection of the pipe to the pipe joint can be completed is formed. And the actuating member is provided so that the conductive part of the actuating member is in contact with the conductive part of the pipe joint when the pipe is in the connection completion position to the pipe joint. May be.

FIG. 1 is a longitudinal sectional view of a pipe joint according to an embodiment of the present invention. FIG. 2 is an exploded view of the pipe joint of FIG. FIG. 3 is a longitudinal sectional view of a flexible pipe inserted into the pipe joint of FIG. FIG. 4 is a longitudinal sectional view of the joint body. 5A is a longitudinal sectional view of the spring stopper member, FIG. 5B is a longitudinal sectional view of the coil spring, and FIG. 5C is a longitudinal sectional view of the slide member. 6A is a perspective view of a spring stopper member, and FIG. 6B is a perspective view of a modified example of the spring stopper member. 7A is a longitudinal sectional view of the fireproof packing, FIG. 7B is a longitudinal sectional view of the guide member, FIG. 7C is a longitudinal sectional view of the hermetic packing, and FIG. FIG. 3 is a longitudinal sectional view of a retainer. 8A is a longitudinal sectional view of the conducting member, FIG. 8B is a longitudinal sectional view of the selectively permeable member, FIG. 8C is a longitudinal sectional view of the watertight packing, and FIG. D) is a longitudinal sectional view of the nut, FIG. 8 (E) is a longitudinal sectional view of the indicator ring, FIG. 8 (F) is a longitudinal sectional view of the watertight ring, and FIG. 8 (G) is a view of the stop ring. It is a longitudinal cross-sectional view. 9A is a perspective view of the conducting member, FIG. 9B is a longitudinal sectional view of the insulating plug, and FIG. 9C is a side view of the conductive pin. FIG. 10 is a view showing a state where the flexible pipe is inserted into the pipe joint of the present embodiment, and the state where the tip of the corrugated pipe is in contact with the slide member. FIG. 11 is a view showing a state in which the slide member is moved by the tip of the corrugated tube and the coil spring is released. FIG. 12 is a view showing a state where the connection of the flexible pipe to the pipe joint of the present embodiment is completed.

  Hereinafter, embodiments of the pipe joint of the present invention will be described. As shown in FIGS. 1 and 2, the pipe joint 1 of the present embodiment includes a joint body 11, a coil spring 12, a spring stopper member 13, a slide member 14, an airtight packing 15, a guide member 16, and a fire resistance. A packing 17, a retainer 18, a nut 19, a stop ring 20, a watertight ring 21, a permselective member 22, an indicator ring 23, a conducting member 24, and a watertight packing 25 are provided. Furthermore, as shown in FIG. 3, the flexible pipe 3 connected to the pipe joint 1 of the present embodiment includes a corrugated pipe 31 and a coating 32.

  In the present embodiment, the flexible pipe 3 is inserted into the inner hole 1A from the insertion port 1I (see FIG. 1) of the pipe joint 1. The flexible pipe 3 is connected to the pipe joint 1 by being inserted to a predetermined position in the inner hole 1 </ b> A of the pipe joint 1 and then pulled in a direction in which the flexible pipe 3 is pulled out from the pipe joint 1.

  In the following description, the moving direction of the flexible pipe 3 with respect to the pipe joint 1 when inserting the flexible pipe 3 into the inner hole 1A of the pipe joint 1 (the direction from the left side to the right side in each figure) is referred to as “pipe insertion direction”. Call it. On the other hand, the moving direction of the flexible pipe 3 relative to the pipe joint 1 when the flexible pipe 3 is pulled out from the pipe joint 1 (direction from the right side to the left side in each figure) is referred to as a “pipe drawing direction”.

  Next, each component 11-25 of the pipe joint 1 is demonstrated. In the following description, the “cross section” is a cross section of each component on a plane including the central axis of each component. Furthermore, “front” indicates “the side in the tube insertion direction (right side in each drawing)”, and “rear” indicates “the side in the tube drawing direction (left side in each drawing)”.

<Fitting body>
As shown in FIG. 4, the joint body 11 is a cylindrical member having a predetermined cross section. Accordingly, the main body 11 has an inner hole 11A therein. The inner hole 11 </ b> A is formed so as to penetrate the joint body 11 in the direction along the central axis C <b> 11 of the joint body 11.

  The diameter of the inner hole 11A (the distance from the central axis C11 of the joint body 11 to the inner peripheral wall surface 11I that defines the inner hole 11A) becomes smaller in the tube insertion direction.

  Furthermore, the joint main body 11 has two annular grooves 11G1 and 11G2 on the inner peripheral portion thereof. Each of the grooves 11G1 and 11G2 extends over the entire circumference of the joint body 11. Of these grooves 11G1 and 11G2, a groove 11G1 provided on the tube insertion direction side (right side in the drawing) is in a state before the nut 19 is moved in the tube pulling direction with respect to the joint body 11 (FIG. 1, In the state shown in FIGS. 10 and 11, a part of the stop ring 20 is accommodated. On the other hand, the groove 11G2 provided on the pipe drawing direction side (left side in the figure) is stopped when the nut 19 is moved in the pipe drawing direction with respect to the joint body 11 (the state shown in FIG. 12). A part of the ring 20 is accommodated.

<Coil spring>
The coil spring 12 is a known coil spring as shown in FIG. In this example, the spring 12 is made of metal.

  As shown in FIG. 1, the spring 12 includes “an annular outer wall surface 11OW of the joint body 11 (see FIG. 4)” and “an annular front wall surface 13F of the spring stopper member 13 in the direction along the central axis C11 of the joint body 11. (Refer to FIG. 5 (A)) ”is arranged in the inner hole 11A of the joint main body 11 so as to be positioned between. At this time, the central axis C13 of the spring 12 coincides with the central axis C11 of the joint body 11. Further, the spring 12 is arranged so as to be movable in the direction along the central axis C11 with respect to the joint body 11.

  In the state shown in FIG. 1, the coil spring 12 is held in a compressed state by a spring stopper member 13 engaged with the joint body 11.

  The inner diameter of the spring 12 (the distance from the central axis C12 of the spring 12 to the inner peripheral wall surface 12I of each coil of the spring 12) is the outer diameter of the corrugated pipe 31 of the flexible pipe 3 (from the central axis C31 of the pipe 31). It is larger than the distance (see FIG. 3) to the outer peripheral wall surface 31O that defines the peak portion 31T of the pipe 31. On the other hand, the outer diameter of the spring 12 (the distance from the central axis C12 of the spring 12 to the outer peripheral wall surface 120 of each coil of the spring 12) is the inner diameter of the joint body 11 in the region where the spring 12 is disposed (the same body). 11 to the inner peripheral wall surface 11I of the main body 11 (see FIG. 4)).

<Spring stopper member>
As shown in FIGS. 5A and 6A, the spring stopper member 13 is a cylindrical member having a predetermined cross section. Therefore, the member 13 has an inner hole 13A extending in the direction along the central axis C13 therein. Further, the member 13 includes one main body 13B, four engagement claws 13P, and one conductive claw 13C. The member 13 is made of a conductive material (for example, metal).

  The main body portion 13B is an annular portion centered on the central axis C13. Each engaging claw 13P is provided on the inner peripheral portion so as to protrude obliquely inward in the radial direction with respect to the direction along the central axis C13 from the inner peripheral portion of the main body portion 13B. These claws 13P are provided at equiangular intervals (90 ° in this example) about the central axis C13.

  Further, the conductive claw 13C is also provided on the inner peripheral portion so as to protrude obliquely inward in the radial direction with respect to the direction along the central axis C13 from the inner peripheral portion of the main body portion 13B. In this example, the claw 13C is provided in alignment with one of the engagement claws 13P in the radial direction.

  As shown in FIG. 1, the member 13 includes an inner portion of the joint body 11 such that the body portion 13B is positioned between the coil spring 12 and the airtight packing 15 in the direction along the central axis C11 of the joint body 11. It arrange | positions in the hole 11A. The coil spring 12 is disposed on the tube insertion direction side with respect to the main body portion 13B of the member 13, and the airtight packing 15 is disposed on the tube drawing direction side. Further, the member 13 is disposed in the inner hole 11 </ b> A so that the conductive claws 13 </ b> C are located on the tube insertion direction side of the airtight packing 15.

  Further, the member 13 is disposed in the inner hole 11 </ b> A of the joint body 11 so that the engaging claw 13 </ b> P engages with the annular protrusion 11 </ b> P (see FIG. 4) of the joint body 11. The member 13 is locked to the joint body 11 by the engagement of the engagement claw 13P with the protrusion 11P. Therefore, at this time, the member 13 does not move in the inner hole 11 </ b> A of the joint body 11 in the direction along the central axis C <b> 11 of the joint body 11. However, when the engaging claw 13P is disengaged from the protruding portion 11P by the movement of the slide member 14 in the tube insertion direction, the member 13 extends along the central axis C11 with respect to the joint body 11. It can move in the direction.

  Further, the member 13 holds the coil spring 12 in a compressed state in a state where the engaging claw 13P is engaged with the protruding portion 11P.

  The inner diameter of the member 13 (the distance from the central axis C13 of the member 13 to the inner periphery of the main body 13B of the member 13) is larger than the outer diameter of the corrugated pipe 31. Furthermore, the inner diameter of the conductive claw 13C of the member 13 (the distance from the central axis C13 of the member 13 to the tip of the conductive claw 13C of the member 13) is smaller than the outer diameter of the corrugated tube 31. Therefore, the conductive claw 13C contacts the peak portion 31T of the corrugated pipe 31 with a constant pressing force.

  The spring stopper member 13 may be a member having the configuration shown in FIG. The spring stopper member 13 shown in FIG. 6B includes one main body 13B, four engagement claws 13P, and four conductive claws 13C. The main body 13B and the engaging claw 13P are the same as the main body 13B and the engaging claw 13P of the spring stopper member 13 shown in FIG.

  Each engaging claw 13C is provided on the inner peripheral portion so as to protrude obliquely inward in the radial direction with respect to the direction along the central axis C13 from the inner peripheral portion of the main body portion 13B. These claws 13C are provided at equiangular intervals (90 ° in this example) about the central axis C13. Further, each claw 13C is provided between two adjacent engaging claws 13P.

<Sliding member>
As shown in FIG. 5C, the slide member 14 is a cylindrical member having a predetermined cross section. Therefore, the member 14 has an inner hole 14A extending in the direction along the central axis C14 therein. In this example, the member 14 is made of a material having a low friction coefficient.

  As shown in FIG. 1, the member 14 is between the conductive claw 13 </ b> C of the spring stopper member 13 and the annular inner wall surface 11 </ b> IW (see FIG. 4) of the joint body 11 and the engagement claw 13 </ b> P of the spring stopper member 13. It arrange | positions in 11 A of inner holes of the coupling main body 11 so that it may be located inside radial direction. At this time, the center axis C <b> 14 of the member 14 coincides with the center axis C <b> 11 of the joint body 11. Further, the member 14 is movable in the direction along the central axis C11 with respect to the joint body 11.

  The member 14 is “aligned with the protruding portion 11P of the joint body 11 in the radial direction of the pipe joint 1” and “the front engaging end 13FE of the engaging claw 13P of the spring stopper member 13 is connected to the protruding portion 11P, the slide member 14, and the like. It is arranged so as to be sandwiched between. At this time, the front engagement end portion 13FE is biased outward in the radial direction. That is, the front engagement end portion 13FE is in a state of including a restoring force inward in the radial direction.

  When the member 14 is thus disposed in the inner hole 11 </ b> A of the joint body 11, the member 14 maintains the engagement state of the spring stopper member 13 with the joint body 11. Further, at this time, the coil spring 12 is held in a compressed state by the spring stopper member 13.

  The member 14 is formed in such a size that the tip 31F (see FIG. 3) of the corrugated tube 31 of the flexible tube 3 inserted into the pipe joint 1 can contact the annular rear wall surface 14R of the member 14.

<Airtight packing>
As shown in FIG. 7C, the airtight packing 15 is a cylindrical member having a predetermined cross section. Accordingly, the packing 15 has an inner hole 15A extending in the direction along the central axis C15 therein. In this example, the packing 15 is made of nitrile butadiene rubber.

  As shown in FIG. 1, the packing 15 is disposed in the inner hole 11 </ b> A of the joint body 11 so as to be positioned between the spring stopper member 13 and the guide member 16 in the direction along the central axis C <b> 11 of the joint body 11. Be placed. A spring stopper member 13 is disposed on the tube insertion direction side with respect to the packing 15, and a guide member 16 is disposed on the tube drawing direction side. At this time, the center axis C15 of the packing 15 coincides with the center axis C11 of the joint body 11. Further, the packing 15 is movable in the direction along the central axis C11 with respect to the joint body 11.

  Further, the packing 15 has an annular front wall surface 15F spaced from the spring stopper member 13 by a predetermined distance, and the annular rear wall surface 15R and the rear outer peripheral wall surface 15OR are in contact with the guide member 15 in the inner hole 11A. Be placed. Further, in the state where the flexible pipe 3 is connected to the pipe joint 1, the packing 15 is in close contact with the corrugated pipe 31 on the inner peripheral wall surface 15 </ b> I, thereby providing an airtight seal with the corrugated pipe 31. .

  The inner diameter of the packing 15 (the distance from the central axis C15 of the packing 15 to the innermost wall surface (inner peripheral wall surface) 15I of the packing 15) is smaller than the outer diameter of the corrugated pipe 31. Of course, the inner diameter of the packing 15 is large enough to allow the corrugated pipe 31 to be inserted into the inner hole 15A of the packing 15. On the other hand, the outer diameter of the packing 15 (the distance from the central axis C15 of the packing 15 to the outermost wall surface 15O of the packing 15) is slightly larger than the inner diameter of the joint body 11 in the region where the packing 15 is disposed. Or the same diameter.

<Guide member>
As shown in FIG. 7B, the guide member 16 is a cylindrical member having a substantially L-shaped cross section. Accordingly, the member 16 has an inner hole 16A extending in the direction along the central axis C16 therein. In this example, the guide member 16 is made of metal.

  As shown in FIG. 1, the member 16 is located in the inner hole 11 </ b> A of the joint body 11 so as to be positioned between the hermetic packing 15 and the fireproof packing 17 in the direction along the central axis C <b> 11 of the joint body 11. Be placed. An airtight packing 15 is arranged on the tube insertion direction side with respect to the member 16, and a fireproof packing 17 is arranged on the tube drawing direction side. At this time, the center axis C <b> 16 of the member 16 coincides with the center axis C <b> 11 of the joint body 11. Furthermore, the member 16 is movable in the direction along the central axis C11 with respect to the joint body 11.

  Further, the member 16 is disposed in the inner hole 11A so as to contact the airtight packing 15 at the annular front wall surface 16F and to contact the fireproof packing 17 at the annular rear wall surface 16R and the outer circumferential wall surface 16O.

  The inner diameter of the member 16 (the distance from the central axis C16 of the member 16 to the inner peripheral wall surface 16I of the member 16) is larger than the outer diameter of the corrugated pipe 31. On the other hand, the outer diameter of the member 16 (the distance from the central axis C16 of the member 16 to the outermost outer peripheral wall surface 16OM of the member 16) is slightly larger than the inner diameter of the joint body 11 in the region where the member 16 is disposed. Small or approximately the same diameter.

<Fireproof packing>
The fireproof packing 17 is a cylindrical member having a substantially rectangular cross section, as shown in FIG. Accordingly, the packing 17 has an inner hole 17A extending in the direction along the central axis C17 therein. In this example, the packing 17 expands when exposed to heat of a predetermined temperature or more, and an inner peripheral wall surface 11I (see FIG. 4) of the joint body 11 and an outer peripheral wall surface 31O (see FIG. 3) of the corrugated pipe 31. It is formed from the material which has a thermal expansion coefficient filled between.

  As shown in FIG. 1, the packing 17 is disposed in the inner hole 11 </ b> A of the joint body 11 so as to be positioned between the guide member 16 and the retainer 18 in the direction along the central axis C <b> 11 of the joint body 11. Is done. A guide member 16 is disposed on the tube insertion direction side with respect to the packing 17, and a retainer 18 is disposed on the tube drawing direction side. At this time, the center axis C <b> 17 of the packing 17 coincides with the center axis C <b> 11 of the joint body 11. Further, the packing 17 is movable with respect to the joint body 11 in the direction along the central axis C11.

  Further, the packing 17 is disposed in the inner hole 11A so as to contact the guide member 16 at the annular front wall surface 17F and the inner peripheral wall surface 17I and to contact the retainer 18 at the annular rear wall surface 17R.

  The inner diameter of the packing 17 (the distance from the central axis C17 of the packing 17 to the inner peripheral wall surface 17I of the packing 17) is larger than the outer diameter of the corrugated pipe 31. On the other hand, the outer diameter of the packing 17 (the distance from the central axis C17 of the packing 17 to the outer peripheral wall surface 17O of the packing 17) is slightly larger or approximately larger than the inner diameter of the joint body 11 in the region where the packing 17 is disposed. Same diameter.

<Retainer>
As shown in FIG. 7D, the retainer 18 is a cylindrical member having a predetermined cross section. Therefore, the retainer 18 has an inner hole 18A extending in the direction along the central axis C18 therein. In this example, the retainer 18 is formed from an elastically deformable material.

  Furthermore, the retainer 18 has a front end 18F, a rear end 18R, and a tapered wall surface 18T. The tapered wall surface 18T is a radially outward wall surface provided between the front end portion 18F and the rear end portion 18R, and the distance from the central axis C18 gradually decreases in the rearward direction. Thus, the wall surface forms an angle with respect to the central axis C18. The front end portion 18 </ b> F is an end portion that engages with the corrugated tube 31 (the valley portion 31 </ b> B) in order to connect the flexible tube 3 to the pipe joint 1.

  As shown in FIG. 1, the retainer 18 is disposed in the inner hole 11 </ b> A of the joint body 11 so as to be positioned between the fireproof packing 17 and the nut 19 in the direction along the central axis C <b> 11 of the joint body 11. The A fireproof packing 17 is arranged on the tube insertion direction side with respect to the retainer 18, and a nut 19 is arranged on the tube drawing direction side. At this time, the central axis C18 of the retainer 18 coincides with the central axis C11 of the joint body 11. Furthermore, the retainer 18 is movable with respect to the joint body 11 in the direction along the central axis C11.

  Furthermore, the retainer 18 is disposed in the inner hole 11A so that the front end portion 18F contacts the fireproof packing 16 and the tapered wall surface 18T contacts the tapered wall surface 19T of the nut 19 (see FIG. 8D). Is done.

  The inner diameter of the front end portion 18F of the retainer 18 (the distance from the central axis C18 of the retainer 18 to the innermost wall surface 18FI of the end portion 18F) is a corrugated state before the flexible tube 3 is inserted into the pipe joint 1. It is larger than the outer diameter of the pipe 31.

  On the other hand, when the coil spring 12 is released and the retainer 18 is moved by the spring 12 through the spring stopper member 13, the airtight packing 15, the guide member 16 and the fireproof packing 17, the inner diameter is pushed (pressed). ) Due to the sliding contact between the tapered wall surface 18T of the retainer 18 and the tapered wall surface 19T of the nut 19 (see FIG. 8D), the outer diameter of the corrugated pipe 31 becomes smaller. Thereby, the front end portion 18F of the retainer 18 is engaged with the corrugated pipe 31 (the valley portion 31B).

  The inner diameter of the rear end portion 18R of the retainer 18 (the distance from the central axis C18 of the retainer 18 to the innermost wall surface 18RI of the end portion 18R) is larger than the outer diameter of the corrugated pipe 31. On the other hand, the outer diameter of the retainer 18 (the distance from the central axis C18 of the retainer 18 to the outermost wall surface 18O) is the inner diameter of the nut 19 in the region where the retainer 18 is disposed (from the central axis C19 of the nut 19 to the inside of the nut 19). Smaller than the distance to the peripheral wall surface 19I.

<Nut>
As shown in FIG. 8D, the nut 19 is a cylindrical member having a predetermined cross section. Therefore, the nut 19 has an inner hole 19A extending in the direction along the central axis C19 therein. In this example, the nut 19 is made of metal.

  The nut 19 has a tapered wall surface 19T facing inward in the radial direction at the front portion 19F. The tapered wall surface 19T is a wall surface that forms an angle with respect to the central axis C19 so that the distance from the central axis C19 gradually increases in the forward direction.

  Furthermore, the nut 19 has three annular grooves 19G1 to 19G3 on the outer periphery thereof. Each groove 19G1 to 19G3 extends over the entire circumference of the nut 19. These grooves 19G1 to 19G3 are provided to be spaced from each other in the direction along the central axis C19. As shown in FIG. 1, a stop ring 20 is disposed in a groove 19G1 provided on the most tube insertion direction side (the rightmost side in the drawing) among these grooves. An indicator ring 23 is disposed in the groove 19G3 provided on the most tube drawing direction side (the leftmost side in the drawing). A watertight ring 21 is disposed in the groove 19G2 provided between the grooves 19G1 and 19G3.

  Further, the nut 19 also has one annular groove 19G4 on its inner periphery. The groove 19G4 is provided closer to the tube drawing direction than the three grooves 19G1 to 19G3. As shown in FIG. 1, a watertight packing 25 is disposed in the groove 19G4.

  In addition, the nut 19 has two through holes 19P1 and 19P2. One through-hole 19P1 is provided between the groove 19G2 and the groove 19G3 in the direction along the central axis C19. The other through-hole 19P2 is provided on the tube drawing direction side (left side in the drawing) from the groove 19G3 in the direction along the central axis C19.

  These through holes 19P1 and 19P2 are formed so as to penetrate the nut 19 in a direction perpendicular to the central axis C19. As shown in FIG. 1, the selectively permeable member 22 is disposed in the through hole 19P1, and the conduction member 24 is disposed in the through hole 19P2.

  As shown in FIG. 1, the nut 19 is attached to the joint body 11 such that a front portion 19 </ b> F (see FIG. 8D) is inserted into the inner hole 11 </ b> A of the joint body 11. Accordingly, the rear portion 19 </ b> R of the nut 19 is disposed outside the joint body 11. At this time, the center axis C19 of the nut 19 coincides with the center axis C11 of the joint body 11. Furthermore, the nut 19 is attached to the joint body 11 so as to be relatively movable in the direction along the central axis C1 with respect to the joint body 11.

  The inner diameter of the nut 19 (the distance from the central axis C19 of the nut 19 to the inner peripheral wall surface 19I of the nut 19) is larger than the outer diameter of the flexible tube 3. The outer diameter of the front portion 19F of the nut 19 (the distance from the central axis C19 of the nut 19 to the outer peripheral wall surface 19FO of the portion 19F (see FIG. 8D)) is the joint body 11 in the region where the portion 19F is disposed. Is approximately equal to the inner diameter of The outer diameter of the rear portion 19R of the nut 19 (the distance from the central axis C19 of the nut 19 to the outer peripheral wall surface 19RO of the portion 19R (see FIG. 8D)) is in the region where the front portion 19F of the nut 19 is disposed. It is larger than the inner diameter of the joint body 11.

<Stop ring>
The stop ring 20 is a ring-shaped member having a substantially circular cross section, as shown in FIG. Accordingly, the ring 20 has an inner hole 20A extending in the direction along the central axis C20 therein. In this example, the ring 20 is made of metal.

  Further, the ring 20 has a slit (not shown) in a part thereof. Thereby, the diameter of the ring 20 can be reduced when a load is applied from the outside.

  As shown in FIG. 1, the ring 20 is disposed in the inner hole 11 </ b> A of the joint body 11 in a state of being disposed in the annular groove 19 </ b> G <b> 1 of the nut 19.

  The inner diameter of the ring 20 (the distance from the central axis C20 of the ring 20 to the inner peripheral wall surface 20I of the ring 20) is smaller than the outer diameter of the front portion 19F of the nut 19. On the other hand, the outer diameter of the ring 20 (the distance from the central axis C20 of the ring 20 to the outer peripheral wall surface 20O of the ring 20) is larger than the inner diameter of the joint body 11 in the region where the ring 20 is disposed.

  Therefore, as described above, when the ring 20 is disposed in the inner hole 11A of the joint body 11, the state before the nut 19 is moved in the tube pulling direction with respect to the joint body 11 (FIG. 1, 10 and 11), the nut 19 is disposed in the annular groove 19G1 and the joint body 11 in the annular groove 11G1 (see FIG. 4). On the other hand, when the ring 20 is disposed in the inner hole 11A of the joint body 11, the nut 19 is moved in the tube pulling direction with respect to the joint body 11 (the state shown in FIG. 12). The annular groove 19G1 of the nut 19 and the annular groove 11G2 of the joint body 11 are disposed. As a result, the nut 19 cannot be moved from the joint body 11 in the tube pulling direction.

<Watertight ring>
As shown in FIG. 8F, the watertight ring 21 is an O-ring having a substantially circular cross section. Therefore, the ring 21 has an inner hole 21A extending in the direction along the central axis C21. In this example, the watertight ring 21 is made of olefin rubber.

  As shown in FIG. 1, the ring 21 is disposed in the inner hole 11 </ b> A of the joint body 11 in a state of being disposed in the annular groove 19 </ b> G <b> 2 (see FIG. 8D) of the nut 19.

  The inner diameter of the ring 21 (the distance from the central axis C21 of the ring 21 to the inner peripheral wall surface 21I of the ring 21) is the distance from the central axis C19 of the nut 19 to the bottom wall surface 19G2B of the annular groove 19G2 of the nut 19. Almost equal. On the other hand, the outer diameter of the ring 21 (the distance from the central axis C21 of the ring 21 to the outer peripheral wall surface 21O of the ring 21) is slightly larger than the inner diameter of the joint body 11 in the region where the ring 21 is disposed.

  Accordingly, the ring 21 is in close contact with the inner peripheral wall surface 11 </ b> I (see FIG. 4) of the joint body 11 in a state where the ring 21 is disposed in the inner hole 11 </ b> A of the joint body 11. Provide a watertight seal in between.

<Selective permeability member>
As shown in FIG. 8B, the selectively permeable member 22 is a cylindrical member having a substantially rectangular cross section. The member 22 is formed from a porous material. The member 22 is disposed in the through hole 19P1 of the nut 19 (see FIG. 8D). The gas leaking from the flexible tube 3 and reaching the through hole 19P1 can permeate the member 22. Therefore, the leakage of gas from the flexible tube 3 can be detected based on the presence or absence of gas that permeates through the member 22.

<Indicator ring>
The indicator ring 23 is a ring-shaped member having a substantially circular cross section, as shown in FIG. Therefore, the member 23 has an inner hole 23A extending in the direction along the central axis C23 therein. In this example, the member 23 is made of rubber. The rubber forming the member 23 is preferably a colored rubber such as red so that the ring 23 can be easily seen when the ring 23 is exposed to the outside from the joint body 11.

  As shown in FIG. 1, the member 23 is disposed in the inner hole 11 </ b> A of the joint body 11 in a state of being disposed in the annular groove 19 </ b> G <b> 3 (see FIG. 8D) of the nut 19.

  The inner diameter of the member 23 (the distance from the central axis C23 of the member 23 to the inner peripheral wall surface 23I of the member 23) is the distance to the bottom wall surface 19G3B of the annular groove 19G3 of the nut 19 (see FIG. 8D). Almost equal. On the other hand, the outer diameter of the member 23 (the distance from the central axis C23 of the member 23 to the outer peripheral wall surface 23O of the member 23) is substantially equal to or slightly larger than the inner diameter of the joint body 11 in the region where the member 23 is disposed. .

<Conductive member>
As shown in FIGS. 8A and 9, the conductive member 24 includes an insulating plug 24Pg and a conductive pin 24Pn.

  As shown in FIG. 9B, the insulating plug 24Pg is a cylindrical member having a through hole 24P extending in a direction along the central axis C24. The insulating plug 24Pg is formed from an insulating material.

  As shown in FIG. 9C, the conductive pin 24Pn includes a columnar head portion 24H and a rod-shaped rod portion 24R. The rod portion 24R is connected to the bottom wall surface 24B of the head portion 24H. Further, the rod portion 24R is bent at the central portion 24C. The conductive pin 24Pn is inserted into the through hole 24P so that the tip portion 24F protrudes from the insulating plug 24Pg. The conductive pin 24Pn is formed of a material having conductivity and elasticity.

  The conducting member 24 is disposed in the through hole 19P2 of the nut 19 as shown in FIG. Specifically, in the member 24, the tip portion 24F of the conductive pin 24Pn protrudes into the inner hole 19A of the nut 19, and the tip 24T of the conductive pin 24Pn is disposed on the tube insertion direction side of the bent portion 24C. As described above, the nut 19 is disposed in the through hole 19P2.

  Further, the tip portion 24F of the conductive pin 24Pn forms an angle with respect to the central axis C19 of the nut 19 so that the distance between the portion 24F and the central axis C19 of the nut 19 is shortened in the forward direction. Yes. Therefore, when the flexible tube 3 is inserted into the pipe joint 1, the tip portion 24 </ b> F of the conductive pin 24 </ b> Pn contacts the peak portion 31 </ b> T of the corrugated tube 31 of the tube 3 with a certain pressing force.

<Watertight packing>
As shown in FIG. 8C, the watertight packing 25 is a cylindrical member having a substantially L-shaped cross section. Accordingly, the packing 25 has an inner hole 25A extending in the direction along the central axis C25 therein. In this example, the packing 25 is made of olefin rubber.

  The packing 25 is disposed in the inner hole 11 </ b> A of the joint body 11 in a state of being disposed in the annular groove 19 </ b> G <b> 4 of the nut 19.

  The inner diameter of the packing 25 (the distance from the central axis C25 of the packing 25 to the innermost end 25I of the packing 25) is smaller than the outer diameter of the flexible tube 3. Accordingly, the ring 25 is in close contact with the coating 32 of the flexible tube 3, thereby providing a watertight seal between the flexible tube 3 and the nut 19.

  On the other hand, the outer diameter of the packing 25 (the distance from the central axis C25 of the packing 25 to the outer peripheral wall surface 25O of the packing 25) is the bottom wall surface 19G4B of the annular groove 19G4 of the nut 19 in which the packing 25 is disposed (FIG. 8). It is substantially equal to the distance to (see (D)).

<Flexible pipe>
As shown in FIG. 3, the flexible tube 3 includes a corrugated tube 31 and a coating 32. The corrugated pipe 31 is a cylindrical member having a corrugated cross section. Accordingly, the flexible tube 3 has an inner hole 3A extending in the direction along the central axis C3 therein. The tube 31 is covered with a coating 32, but a portion within a predetermined range from the tip of the tube 31 is not covered with the coating 32. That is, the tip portion of the tube 31 is exposed to the outside. In this example, the tube 31 is made of metal, and the coating 32 is made of resin.

<Connection of flexible pipe to pipe joint>
Next, connection of the flexible pipe 3 to the pipe joint 1 will be described. When connecting the flexible pipe 3 to the pipe joint 1, the flexible pipe 3 is inserted into the inner hole 19 </ b> A of the nut 19 from the insertion port 1 </ b> I (see FIG. 1) in the pipe insertion direction. When the flexible tube 3 is moved in the tube insertion direction, the tip 31F of the corrugated tube 31 comes into contact with the slide member 14 (annular rear wall surface 14R) as shown in FIG.

  When the flexible tube 3 is further moved in the tube insertion direction, the slide member 14 is moved in the tube insertion direction by the tip 31F of the corrugated tube 31 as shown in FIG. As a result, the slide member 14 is released from the position aligned in the radial direction with the “annular protrusion 11P of the joint body 11 and the front engagement end 13FE of the spring stopper member 13”. As a result, the front engagement end portion 13FE of the spring stopper member 13 is moved radially inward by the restoring force, and is disengaged from the annular projecting portion 11P of the joint body 11. Thereby, the coil spring 12 is released.

  Then, the coil spring 12 moves the retainer 18 in the tube drawing direction by the restoring force of the spring 12 through the “spring stopper member 13, the airtight packing 15, the guide member 16 and the fireproof packing 17”.

  As described above, in this embodiment, the “spring stopper member 13 and the coil spring 12” are used to place the flexible pipe 3 in a predetermined position in the inner hole 1 </ b> A of the pipe joint 1 (the slide member 14 abuts the annular inner wall surface 11 </ b> IW of the joint body 11. This is an actuating member that can be actuated when inserted up to a position to be actuated.

  During the movement of the retainer 18, the front end portion 18 </ b> F of the retainer 18 moves radially inward (reduces diameter) by sliding contact between the tapered wall surface 18 </ b> T of the retainer 18 and the tapered wall surface 19 </ b> T of the nut 19. Thereby, the end 18F engages with the valley 31B of the corrugated tube 31 of the flexible tube 3.

  In this state, when the flexible tube 3 is pulled in the tube pulling direction, the corrugated tube 31 moves the nut 19 in the tube pulling direction via the retainer 18. Thereby, as shown in FIG. 12, the nut 19 moves relative to the joint body 11 until the indicator ring 23 is exposed from the joint body 11 to the outside. Thereby, the connection of the flexible pipe 3 to the pipe joint 1 is completed.

  That is, in this embodiment, “operation of the spring stopper member 13”, more specifically, “spring stopper member to a position (position shown in FIG. 11) where the retainer 18 is engaged with the valley portion 31 B of the corrugated pipe 31. 13 ”is a state where the connection of the flexible pipe 3 to the pipe joint 1 can be completed (the connection of the flexible pipe 3 to the pipe joint 1 is completed by pulling the flexible pipe 3 in the pipe pulling direction). Is formed). Then, after the operation of the spring stopper member 13, the connection of the pipe 3 to the pipe joint 1 is completed by moving the pipe 3 in the direction in which the flexible pipe 3 is pulled out (the pipe pulling direction).

  In the present embodiment, when the connection of the flexible pipe 3 to the pipe joint 1 is not completed, the spring stopper member 13 remains engaged with the joint body 11. For this reason, the “conductive state between the conductive pin 24Pn and the joint body 11” via the “corrugated tube 31, the spring stopper member 13, and the coil spring 12” is not formed.

  On the other hand, when the connection is completed, the conduction state is formed. That is, in this embodiment, “the coil spring 12, the spring stopper member 13, the airtight packing 15, the guide member 16, the fireproof packing 17, and the retainer 18” can complete the “connection of the flexible pipe 3 to the pipe joint 1. And the “flexible pipe 3 (corrugated pipe 31)” is in the “position where connection to the pipe joint has been completed (position where connection to the pipe joint has been completed)”. The joint body 11 is connected to each other via the “corrugated pipe 31, the spring stopper member 13 and the coil spring 12”, whereby the conductive state is formed.

  Therefore, when it is confirmed whether or not the "conductive state between the conductive pin 24Pn and the joint body 11" is formed using a conductive device such as an electric tester, the same conductive state is not formed, It can be determined that the connection of the flexible pipe 3 to the pipe joint 1 is not completed. On the other hand, when the same conductive state is formed, it can be determined that the connection of the flexible pipe 3 to the pipe joint 1 is completed. According to this, it is possible to accurately determine the completion of the connection of the flexible pipe 4 to the pipe joint 1.

  In the present embodiment, when the connection of the flexible pipe 3 to the pipe joint 1 is completed, the indicator ring 23 is visible from the outside. Therefore, it can be determined whether or not the connection of the flexible pipe 3 to the pipe joint 1 is completed based on whether or not the indicator ring 23 can be visually recognized.

  However, as will be described later, the indicator ring 23 may be visible from the outside even when the connection of the flexible pipe 3 to the pipe joint 1 is not completed. Therefore, in this embodiment, “determination of completion of connection of the flexible pipe 3 to the pipe joint 1” using the indicator ring 23 is an auxiliary determination for the same determination using the above-described conduction device. Therefore, in this embodiment, the indicator ring 23 may not be provided.

  Further, the airtight packing 15 is in close contact with the corrugated pipe 31. For this reason, although the flexible tube 3 is inserted to a position where the corrugated tube 31 is in close contact with the airtight packing 15, the flexible tube 3 is not inserted until a position where the engagement of the spring stopper member 13 with the joint body 11 is released. When the corrugated tube 3 is pulled in the tube pulling direction, the nut 19 may be moved in the tube pulling direction via the “airtight packing 15, guide member 16, fireproof packing 17, and retainer 18”. In particular, when the flexible pipe 3 is pulled in a state where the central axis C3 of the flexible pipe 3 is inclined with respect to the central axis C1 of the pipe joint 1, as described above, the nut 19 is moved in the pipe drawing direction. Is likely to be.

  In this case, although the connection of the flexible pipe 3 to the pipe joint 1 is not completed, there is a possibility that the indicator ring 23 is visible from the outside. For this reason, when it is determined that the connection is completed because the indicator ring 23 can be visually recognized, the determination is an erroneous determination.

  In addition, the watertight packing 25 is in close contact with the coating 32 of the flexible tube 3. For this reason, although the flexible tube 3 is inserted to a position where the coating 32 is in close contact with the watertight packing 25, the flexible tube 3 is not inserted until a position where the engagement of the spring stopper member 13 with the joint body 11 is released. When the corrugated pipe 3 is pulled in the pipe drawing direction, the nut 19 may be moved in the pipe drawing direction via the “watertight packing 25”. In particular, when the flexible pipe 3 is pulled in a state where the central axis C3 of the flexible pipe 3 is inclined with respect to the central axis C1 of the pipe joint 1, as described above, the nut 19 is moved in the pipe drawing direction. Is likely to be.

  In this case as well, the indicator ring 23 may be visible from the outside although the connection of the flexible pipe 3 to the pipe joint 1 is not completed. For this reason, when it is determined that the connection is completed because the indicator ring 23 can be visually recognized, the determination is an erroneous determination.

  However, “the flexible tube 3 is inserted up to the position where the corrugated tube 31 is in close contact with the airtight packing 15, but the flexible tube 3 is not inserted up to the position where the spring stopper member 13 is released from the joint body 11. Or “The flexible tube 3 is inserted to a position where the covering 32 is in close contact with the watertight packing 25, but the flexible tube 3 is not inserted until the position where the spring stopper member 13 is released from the joint body 11. Even if the flexible tube 3 is pulled in the tube pulling direction in the “state”, the spring stopper member 13 remains in the initial position (the position shown in FIG. 10).

  For this reason, in this embodiment, a conductive state is not formed between the conductive pin 24Pn and the joint body 11. Therefore, according to this embodiment, the connection of the flexible pipe 3 to the pipe joint 1 is completed based on whether or not a conduction state is formed “between the conductive pin 24Pn and the joint body 11” using the conduction device. By determining whether or not it is, the possibility of making an erroneous determination as described above is reduced.

  In the above embodiment, based on whether or not the “conductive state between the conductive pin 24Pn and the joint body 11” via the “corrugated pipe 31, the spring stopper member 13, and the coil spring 12” is formed, It is determined whether or not the connection of the flexible pipe 3 to the joint 1 is completed. However, at least the “spring stopper member 13 or the coil spring 12” is in a position (position shown in FIG. 11) where the retainer 18 is engaged with the corrugated pipe 31 and the flexible pipe 3 is completely connected to the pipe joint 1 ( In the position shown in FIG. 12, the connection of the flexible pipe 3 to the pipe joint 1 is completed. Accordingly, in the above embodiment, if possible, the flexible pipe to the pipe joint 1 is determined based on whether or not a conductive state is formed between the “corrugated pipe 31” and the “spring stopper member 13 or the coil spring 12”. It may be determined whether or not the third connection is completed.

  Furthermore, in the said embodiment, the coil spring 12 moves the retainer 18 to a pipe extraction direction via "The spring stopper member 13, the airtight packing 15, the guide member 16, and the fireproof packing 17". However, the pipe joint 1 is configured such that the coil spring 12 moves the retainer 18 in the pipe drawing direction via the “spring stopper member 13” and “at least one of the airtight packing 15, the guide member 16, and the fireproof packing 17”. May be. Alternatively, the pipe joint 1 may be configured such that the coil spring 12 moves the retainer 18 in the pipe drawing direction only through the “spring stopper member 13”.

  Furthermore, in the said embodiment, after the retainer 18 engages with the corrugated pipe | tube 31 with the restoring force of the coil spring 12, the connection of the flexible pipe | tube 3 to the pipe joint 1 is completed by pulling the flexible pipe | tube 3 to a pipe drawing direction. To do. However, the pipe joint 1 may be configured such that the connection of the flexible pipe 3 to the pipe joint 1 is completed only by the restoring force of the coil spring 12.

  As can be seen from the above description, the present invention is a pipe joint 1 to which a pipe is connected, and the pipe (flexible pipe 3) is placed in a predetermined position in the inner hole 1A of the pipe joint (the slide member 14 is connected to the joint body). 11 (position to be brought into contact with the annular inner wall surface 11IW), and an operation member (a spring stopper member 13 and a coil spring 12) that can be operated when inserted into the pipe joint to the pipe joint by the operation of the operation member. It is related with the pipe joint in which the state which can complete the connection of is formed.

  In the present invention, the tube has a conductive portion (corrugated tube 31) having conductivity, and the actuating member has conductive portions (all portions of the spring stopper member 13 and all portions of the coil spring 12). Have. Further, the operating member is located at a position that forms a state where the connection of the pipe to the pipe joint can be completed (a spring stopper at a position where the retainer 18 is engaged with the valley 31B of the corrugated pipe 31 of the flexible pipe 3). (There is a member 13 and a coil spring 12), and the pipe is in a connection completion position to the pipe joint (the position where the flexible pipe 3 is pulled in the pipe drawing direction after the retainer 18 is engaged with the valley 13B of the flexible pipe 3) The actuating member is provided such that the conductive part of the actuating member is in contact with the conductive part of the tube.

  According to this, a conductive state is formed between the conductive part of the operating member and the conductive part of the pipe only when the connection of the pipe (flexible pipe 3) to the pipe joint is completed. Therefore, the completion of the connection of the pipe to the pipe joint can be accurately determined based on whether or not this conductive state is formed.

  Furthermore, in this invention, the connection of the said pipe | tube to the said pipe joint is completed by moving the said pipe | tube in the direction which pulls out the said pipe | tube after the action | operation of the said operation member.

  In addition, in the present invention, the main body of the pipe joint (joint main body 11) has a conductive part having conductivity, and at a position that forms a state in which the connection of the pipe to the pipe joint can be completed. The actuating member is provided so that the conductive part of the actuating member is in contact with the conductive part of the pipe joint when the actuating member is present and the pipe is in a connection completion position to the pipe joint. Yes. According to this, a conduction state is formed between the conductive portion of the pipe and the conductive portion of the joint body through the conductive portion of the operating member. Therefore, the completion of the connection of the pipe to the pipe joint can be accurately determined based on whether or not this conductive state is formed.

  DESCRIPTION OF SYMBOLS 1 ... Pipe joint, 11 ... Joint main body, 12 ... Coil spring, 13 ... Spring stopper member, 14 ... Slide member, 15 ... Airtight packing, 16 ... Guide member, 17 ... Fireproof packing, 18 ... Retainer, 19 ... Nut, 20 ... Stop Ring, 21 ... Watertight ring, 22 ... Selective permeability member, 23 ... Indicator ring, 24 ... Conductive member, 25 ... Watertight packing

Claims (3)

A pipe joint to which a pipe is connected, the pipe joint comprising an actuating member that is operable when the pipe is inserted to a predetermined position in an inner hole of the pipe joint; In a pipe joint in which a state is formed that can complete the connection of the pipe to
The tube has an electrically conductive portion and the actuating member has an electrically conductive portion;
When the actuating member is in a position that forms a state where the connection of the pipe to the pipe joint can be completed and the pipe is in a connection completion position to the pipe joint, the conductive portion of the actuating member is The actuating member is provided so as to be in contact with the conductive portion of the tube;
Pipe fittings. In the pipe joint according to claim 1,
The connection of the pipe to the pipe joint is completed by moving the pipe in the direction of pulling out the pipe after the operation member is actuated.
Pipe fittings. In the pipe joint according to claim 1 or 2,
The body of the pipe joint has a conductive part with conductivity,
When the actuating member is in a position that forms a state where the connection of the pipe to the pipe joint can be completed, and the pipe is in the connection completion position to the pipe joint, the conductive portion of the pipe joint The actuating member is provided so that the conductive part of the actuating member is in contact,
Pipe fittings.

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