JP6281370B2 - Pipe fitting - Google Patents

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). Thereby, the guide member is disengaged from the joint body, 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 comes out of 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 51 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, when the corrugated pipe reaches the hermetic packing when the flexible pipe is inserted into the pipe joint, the hermetic packing comes into close contact with the corrugated pipe. For this reason, if the flexible tube is pulled in the tube pulling direction before the slide member is slid by the corrugated tube in the tube insertion direction (that is, before the engagement of the guide member with the joint body is released), the hermetic packing is There is a possibility that the corrugated tube can be 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 the trough part of a corrugated pipe. In this state, when the flexible pipe is further pulled in the pipe pulling direction, the push nut is moved in the pipe pulling direction via the retainer, and as a result, the indicator ring may be pulled out 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.

  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 flexible tube is in close contact with the seal member when the flexible tube is inserted into the pipe joint. 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 come out 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.

  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 pulled out from the joint body, and a state in which the indicator ring can be visually recognized from the outside is formed.

  In view of such circumstances, an object of the present invention is to provide a pipe joint that is less likely to misidentify completion of connection of a pipe to the pipe joint.

  One of the inventions of the present application is a pipe joint to which a pipe is connected, and the pipe (for example, a flexible pipe) is inserted into a predetermined position in an inner hole of the pipe joint and then the pipe is pulled out in a direction to be pulled out. The pipe is connected to the pipe joint by moving the pipe.

  The pipe joint of the present invention is a movable member that can be moved by moving the pipe in the direction of pulling out the pipe (for example, a spring stopper member, a coil spring, an airtight packing, a guide member, a fireproof packing, a retainer, an indicator ring, an indicator member). It comprises.

  In the present invention, after the pipe is inserted to a predetermined position in the inner hole of the pipe joint, the moving member is moved more than a predetermined amount by moving the pipe in the pulling direction. The pipe is connected to the pipe joint by movement.

  In the present invention, the member to be moved does not move more than the predetermined amount by the movement of the pipe in the pulling direction before the pipe is inserted to the predetermined position. It is locked to “a member fixed to the main body”.

  On the other hand, the movable member is released from the locking of the main body of the pipe joint or the member fixed to the main body by the movement of the pipe after the pipe is inserted to the predetermined position. Then, it becomes possible to move more than the predetermined amount in the tube drawing direction.

  According to the present invention, the movement of the pipe is released after the pipe is inserted to a predetermined position in the inner hole of the pipe joint, so that the locked member is released. Thereafter, when the tube is moved in the drawing direction, the moved member is moved to a predetermined amount or more. Thereby, the pipe is connected to the pipe joint. However, the movement of the member to be moved more than a predetermined amount is possible only after the tube is inserted to the predetermined position. That is, even if the tube is moved in the drawing direction before the tube is inserted to the predetermined position, the member to be moved does not move beyond a predetermined amount. For this reason, the connection of the pipe to the pipe joint is not completed. Therefore, there is a low possibility that the connection of the pipe to the pipe joint is completed even though the pipe is not inserted to the predetermined position.

  In particular, the connection of the pipe to the pipe joint is completed even if the pipe fitting is provided with a display means for displaying the completion of the connection of the pipe to the pipe joint when the moved member moves beyond a predetermined amount. If not, the moved member has not moved more than a predetermined amount. Therefore, the possibility of misidentifying the completion of the connection of the pipe to the pipe joint by the display means is also low.

  Another invention of the present application is a pipe joint to which a pipe is connected, and the pipe (for example, a flexible pipe) is inserted into a predetermined position in an inner hole of the pipe joint and then the pipe is pulled out in a direction to be pulled out. The pipe is connected to the pipe joint by moving the pipe.

  A movable member (for example, a spring stopper member, a coil spring, an airtight packing, a guide member, a fireproof packing, a retainer, an indicator ring, an indicator member) movable by movement of the tube in the direction of pulling out the tube, and the tube And a coupling member (eg, watertight packing) that can be “frictionally contacted or engaged” with the tube before being inserted into position.

  In the present invention, after the pipe is inserted to a predetermined position in the inner hole of the pipe joint, the moving member is moved more than a predetermined amount by moving the pipe in the pulling direction. The pipe is connected to the pipe joint by movement. Further, before and after the pipe is inserted to the predetermined position, the joint member is arranged so as not to move more than the predetermined amount by moving the pipe in the pulling direction. Or “member fixed to the main body”.

  According to the present invention, the coupling member is in frictional contact or engagement with the tube. Thus, the joint member receives a force in the pulling direction when pulled in the pulling direction after the tube “frictionally contacts or engages” the pipe member. For this reason, when the joint member is not fixed to the main body of the pipe joint, when the pipe is pulled in the pulling direction, the joint member also moves relative to the main body of the pipe joint in the pulling direction.

  If a display means for indicating the completion of connection of the pipe to the pipe joint is provided on the joint member, and the display means is exposed to the outside by movement of the joint member in the pulling direction, the pipe Although the connection of the pipe to the joint is not completed, the display means is exposed to the outside. In this case, it is mistaken that the connection of the pipe to the pipe joint is completed.

  However, in the present invention, the joint member is fixed to the main body of the pipe joint or a member fixed to the main body so as not to move relative to the main body of the pipe joint in the drawing direction. Therefore, there is a low possibility of misidentifying that the connection of the pipe to the pipe joint is completed.

  Further, the moved member may be, for example, a seal member (for example, an airtight packing) that provides a seal with the pipe, or a display member (for example, an indicator ring) that displays the completion of connection of the pipe to the pipe joint. , An indicator member), or an engaging member (for example, a retainer) that engages with the tube.

  Alternatively, the member to be moved may be, for example, a holding member (for example, holding a coil spring for moving the member to be moved in a compressed state before the tube is moved to the predetermined position before the tube is moved). Spring stopper member).

  In this case, the holding member holds the coil spring in a compressed state without elastic deformation before the tube moves to the predetermined position after the tube is inserted to the predetermined position, and the tube is inserted to the predetermined position. It is preferable that the holding member is unlocked from the main body of the pipe joint by being deformed by the movement of the pipe after that.

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. 4A is a longitudinal sectional view of the joint body, and FIG. 4B is a longitudinal sectional view of the coil spring. 5A is a perspective view of the spring stopper member before deformation, FIG. 5B is a perspective view of the member after deformation, FIG. 5C is a front view of the member, and FIG. (D) is the longitudinal cross-sectional view of the same member along the DD line of FIG.5 (C). 6A is a longitudinal sectional view of the fireproof packing, FIG. 6B is a longitudinal sectional view of the guide member, and FIG. 6C is a longitudinal sectional view of the airtight packing. 7A is a longitudinal sectional view of the indicator member, FIG. 7B is a longitudinal sectional view of the indicator ring, FIG. 7C is a longitudinal sectional view of the retainer stopper member, and FIG. ) Is a longitudinal sectional view of the retainer. 8A is a longitudinal sectional view of the selectively permeable member, FIG. 8B is a longitudinal sectional view of the watertight packing, FIG. 8C is a longitudinal sectional view of the nut, and FIG. ) Is a longitudinal sectional view of the disassembly ring, FIG. 8E is a longitudinal sectional view of the watertight ring, and FIG. 8F is a longitudinal sectional view of the stop ring. FIG. 9 is a view showing a state in which the flexible pipe is inserted into the pipe joint of the present embodiment and the tip of the corrugated pipe is in contact with the spring stopper member. FIG. 10 is a view showing a state in which the peak portion of the foremost portion of the corrugated tube has exceeded the spring stopper member in the tube insertion direction. FIG. 11 is a view showing a state immediately after the spring stopper member is deformed. FIG. 12 is a view showing a state in which the spring stopper member is released from the coupling body. FIG. 13 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, an airtight packing 14, a guide member 15, a fireproof packing 16, and a retainer. 17, retainer stopper member 18, indicator ring 19, indicator member 20, nut 21, stop ring 22, watertight ring 23, disassembly ring 24, permselective member 25, watertight packing 26, Have Furthermore, as shown in FIG. 3, the flexible tube 3 of this embodiment includes a corrugated tube 31 and a coating 32.

  In the present embodiment, the flexible pipe 3 is inserted into the inner hole 1 </ b> A from the insertion port 1 </ b> I 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. 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 (the direction from the right side to the left side in each figure) is referred to as a “pipe drawing direction”.

  Next, each component 11 to 26 of the pipe joint 1 will be described. 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>
The joint body 11 is a tubular member having a predetermined cross section as shown in FIG. 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 11B and 11C on its inner peripheral portion. Each groove 11 </ b> B, 11 </ b> C extends over the entire circumference of the joint body 11. These grooves 11B and 11C are provided to be spaced from each other in the direction along the central axis C11. Of these grooves 11B and 11C, the groove 11B provided on the tube insertion direction side (right side in the figure) has an outer claw portion 13B (see FIG. 5) of the spring stopper member 13 as shown in FIG. A part enters (engages), and the member 13 is engaged with the joint body 11. Hereinafter, the groove 11B is referred to as an “engagement groove”. On the other hand, as shown in FIG. 1, a part of the stop ring 22 is accommodated in the groove 11C provided on the tube drawing direction side (left side in the drawing).

  In addition, the joint body 11 has a through hole 11D as shown in FIG. The hole 11D is formed so as to penetrate the joint body 11 in a direction perpendicular to the central axis C11 (the radial direction of the joint body 11). The hole 11D is provided at a position where the member 20 is visible through the hole 11D when the indicator member 20 is positioned at a position indicating the completion of the connection of the flexible pipe 3 to the pipe joint 1 (see FIG. 13). ). That is, the hole 11D is a visual recognition hole for visually recognizing the indicator member 20. Hereinafter, the through hole 11 </ b> D is referred to as a “viewing hole”.

<Coil spring>
As shown in FIG. 4B, the coil spring 12 is a known coil spring. In this example, the spring 12 is made of metal.

  As shown in FIG. 1, the spring 12 is disposed at a predetermined position in the inner hole 11 </ b> A of the joint body 11. Specifically, the spring 12 is formed in the direction along the central axis C <b> 11 of the joint body 11 with the “annular wall surface 11 </ b> E of the joint body 11 (see FIG. 4A)” and the “outer side claw part 13 </ b> O of the spring stopper member 13. It arrange | positions in 11 A of inner holes so that it may be located between the front annular wall surface 13OF (refer FIG. 5) and the front annular wall surface 13BF of the main-body part 13B of the spring stopper member 13.

  At this time, the central axis C12 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 addition, when at least a part of the outer peripheral claw portion 13B of the spring stopper member 13 is locked in the engagement groove 11B of the joint body 11, the spring 12 is in a compressed state.

  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 hole 11A of the joint body 11 in the region where the spring 12 is disposed. It is approximately equal to the inner diameter.

<Spring stopper member>
As shown in FIG. 5, the spring stopper member 13 is a ring-shaped 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 portion 13B, eight outer peripheral claw portions 13O, and eight inner peripheral claw portions 13I. The member 13 is formed from a thin metal plate.

  Each outer claw portion 13O is provided on the outer peripheral portion so as to protrude outward from the outer peripheral portion of the main body portion 13B. These claw portions 13O are provided at equiangular intervals (45 ° in this example) about the central axis C13 of the spring stopper member 13. Further, the front wall surface 13OF of each claw portion 13O is flush with the front wall surface 13BF of the main body portion 13B, and the rear wall surface 13OR of each claw portion 13O is flush with the rear wall surface 13BR of the main body portion 13B. Yes. Accordingly, the thickness of each claw portion 13O is equal to the thickness of the main body portion 13B.

  Furthermore, each nail | claw part 13O is extended in the outer peripheral part of the main-body part 13B over a predetermined angle width (in this example, 15 degrees) centering on the central axis C13. Accordingly, the circumferential angle between the two adjacent claws 13O is 30 °.

  Each inner peripheral claw portion 13I is provided on the inner peripheral portion so as to protrude inward from the inner peripheral portion of the main body portion 13B. These claw portions 13I are provided at equiangular intervals (45 ° in this example) about the central axis C13 of the spring stopper member 13. Further, the front annular wall surface 13IF of each claw portion 13I is bent at a predetermined angle with respect to the front annular wall surface 13BF of the main body portion 13B, and the rear annular wall surface 13IR of each claw portion 13I is changed to the rear annular wall surface 13BR of the main body portion 13B. It is provided so as to be bent with respect to the predetermined angle. The thickness of each claw portion 13I is equal to the thickness of the main body portion.

  Furthermore, each nail | claw part 13I is extended to the inner peripheral part of the main-body part 13B over a predetermined angle (in this example, 15 degrees) centering | focusing on the central axis C13. Therefore, the angle in the circumferential direction between two adjacent claw portions 13I is 30 °.

  The outer peripheral claw portion 13O and the inner peripheral claw portion 13I are provided so as to be aligned in the radial direction around the central axis C13 of the spring stopper member 13, respectively.

  As shown in FIG. 1, the member 13 is disposed at a predetermined position in the inner hole 11 </ b> A of the joint body 11. Specifically, the member 13 is disposed in the inner hole 11A so as to be positioned between the coil spring 12 and the hermetic packing 14 in the direction along the central axis C11. A coil spring 12 is arranged on the tube insertion direction side with respect to the member 13, and an airtight packing 14 is arranged on the tube drawing direction side.

  At this time, the center axis C13 of the member 13 coincides with the center axis C11 of the joint body 11. Further, the member 13 is arranged so as to be movable in the direction along the central axis C11 with respect to the joint body 11.

  Further, the member 13 is disposed in the inner hole 11 </ b> A of the joint body 11 so that the outer peripheral claw portion 13 </ b> O engages with the engagement groove 11 </ b> B of the joint body 11. The member 13 is locked to the joint main body 11 by the engagement of the outer peripheral claw portion 13O with the engaging groove 11B. 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, actually, since the engaging groove 11B has a certain width in the direction along the central axis C11, the member 13 is locked to the joint body 11 via the outer peripheral claw portion 13O. However, the member 13 can move by a certain amount with respect to the joint body 11 in the direction along the central axis C11.

  Further, the member 13 is disposed in the inner hole 11A so that the inner peripheral end 13IE of the inner peripheral claw portion 13I is located on the tube insertion direction side of the airtight packing 14. However, the member 13 is disposed in the inner hole 11 </ b> A so that the peak portion 31 </ b> T <b> 1 (see FIG. 3) of the corrugated tube 31 is crossed in the tube insertion direction.

  In addition, the member 13 is joined to the airtight packing 14 in the main body portion 13B. Further, the member 13 holds the coil spring 12 in a compressed state in a state where the outer peripheral claw portion 13O is engaged with the engagement groove 11B.

  The thickness of the member 13 is such that the inner peripheral claw portion 13I extends from the corrugated pipe 31 in the tube pulling direction in a state where a part of the outer peripheral claw portion 13O is engaged with the engagement groove 11B of the joint body 11 (see FIG. 1). When the force is received, the inner peripheral claw portion 13I moves in the tube pulling direction, and as shown in FIG. 5B, the main body portion 13B and the outer peripheral claw portion 13O (the outer peripheral end 13OE) are inserted into the tube. It is deformed so as to fall down in the direction, and has a sufficiently thin thickness so that the outer claw portion 13O comes out of the engaging groove 11B.

  However, the thickness of the member 13 is such that when the airtight packing 14 receives a force in the tube pulling direction from the corrugated tube 31 with a part of the outer peripheral claw portion 13O engaged with the engaging groove 11B of the joint body 11. The thickness is sufficiently thick so that the outer claw portion 13O does not deform so as to come out of the engaging groove 11B.

  Of course, the thickness of the member 13 is determined when the member 13 receives only the extension force of the coil spring 12 in a state where a part of the outer peripheral claw portion 13O is engaged with the engaging groove 11B of the joint body 11 (the member 13). When the spring 12 is held in the inner hole 11 of the joint body 11 in a compressed state), the thickness is sufficiently thick so that the outer peripheral claw portion 13O does not deform so as to come out of the engaging groove 11B.

  It should be noted that the spring stopper member 13 of the present embodiment does not contain stress (restoring force) in the state before the deformation. Therefore, as described above, the member 13 is deformed by the force in the tube pulling direction received from the corrugated tube 31 and is not deformed by the restoring force.

  Furthermore, the member 13 has a sufficient strength that does not break even if deformed as described above, and durability that does not break for a long time after the deformation.

  The inner diameter of the member 13 (the distance from the central axis C13 of the member 13 to the inner peripheral end 13IE of the inner peripheral claw portion 13I) is the outer diameter of the valley portion 31B of the corrugated pipe 31 before the deformation of the member 13 ( The outer diameter of the crest 31T of the corrugated pipe 31 is larger than the distance from the central axis C31 of the pipe 31 to the outer peripheral wall surface 31O defining the valley 31B (see FIG. 3) of the pipe 31. The distance from the central axis C31 to the outer peripheral wall surface 31O that defines the crest 31T of the same pipe is smaller. On the other hand, the inner diameter of the member 13 is smaller than the inner diameter before deformation after the deformation of the member 13, but larger than the outer diameter of the valley 31 </ b> B of the corrugated pipe 31 and the peak 31 </ b> T of the corrugated pipe 31. Is smaller than the outer diameter.

  The outer diameter of the member 13 (the distance from the central axis C13 of the member 13 to the outer peripheral end 13OE of the outer claw portion 13O) is such that at least a part of the outer claw portion 13O is a joint body before the member 13 is deformed. 11 is a diameter (a diameter larger than the inner diameter of the joint body 11) entering the engaging groove 11B (see FIG. 4A). On the other hand, the outer diameter of the member 13 is a diameter (a diameter smaller than the inner diameter of the joint body 11) from which the outer peripheral claw portion 13 </ b> O comes out of the locking groove 13 </ b> B of the joint body 11 after the member 13 is deformed. Regarding the outer peripheral claw portion 13O, the inner diameter of the joint body 11 refers to “the inner peripheral wall surface 11I that defines the inner hole 11A of the joint body 11” and “the center of the joint body 11 in the region where the engagement groove 11B is formed. This is the distance between the axis C11 ".

  The member 13 is configured to move the indicator ring 19 in the tube pulling direction via the “airtight packing 14, guide member 15, fireproof packing 16 and retainer 17” by the extension force (restoring force) of the coil spring 12. . However, at least one of these components (the airtight packing 14, the guide member 15, the fireproof packing 16, and the retainer 17) is disposed between the indicator ring 19 and the member 13, and the member 13 is connected to the indicator via the component. The ring 19 may be configured to move. Alternatively, the indicator ring 19 is disposed between the hermetic packing 14 and the member 13 (the indicator ring 19 is disposed so as to be in direct contact with the member 13), and the member 13 moves the indicator ring 19 directly. It may be configured.

  Furthermore, a slit extending in the radial direction may be provided in the main body 13B of the member 13 so that the member 13 is easily deformed by pulling out the corrugated pipe 31.

<Airtight packing>
As shown in FIG. 6C, the airtight packing 14 is a ring-shaped member having a substantially rectangular cross section. Therefore, the packing 14 has an inner hole 14A extending in the direction along the central axis C14 therein. In this example, the airtight packing 14 is formed of nitrile butadiene rubber.

  As shown in FIG. 1, the packing 14 is disposed at a predetermined position in the inner hole 11 </ b> A of the joint body 11. Specifically, the packing 14 is disposed in the inner hole 11A so as to be positioned between the spring stopper member 13 and the guide member 15 in the direction along the central axis C11. A spring stopper member 13 is arranged on the tube insertion direction side with respect to the packing 14, and a guide member 15 is arranged on the tube drawing direction side.

  At this time, the center axis C14 of the packing 14 coincides with the center axis C11 of the joint body 11. Further, the packing 14 is disposed so as to be movable in a direction along the central axis C11 with respect to the joint body 11.

  Further, the packing 14 is disposed such that the front annular wall surface 14F contacts the spring stopper member 13 and the rear annular wall surface 14R contacts the guide member 15 in a state where the packing 14 is disposed in the inner hole 11A. Further, in the state in which the flexible pipe 3 is connected to the pipe joint 1, the packing 14 has an inner peripheral wall surface 14 </ b> I that is in close contact with the corrugated pipe 31, thereby providing an airtight seal with the corrugated pipe 31.

  The inner diameter of the packing 14 (the distance from the central axis C14 of the packing 14 to the innermost wall surface 14I of the packing 14) is smaller than the outer diameter of the corrugated pipe 31. Of course, the inner diameter of the packing 14 is so large that the corrugated pipe 31 can be inserted into the inner hole 14A of the packing 14. On the other hand, the outer diameter of the packing 14 (the distance from the central axis C14 of the packing 14 to the outermost wall surface 14O of the packing 14) is the diameter of the inner hole 11A of the joint body 11 in the region where the packing 14 is disposed. Slightly larger or the same diameter.

<Guide member>
The guide member 15 is a ring-shaped member having a substantially L-shaped cross section as shown in FIG. Accordingly, the member 15 has an inner hole 15A extending in the direction along the central axis C15 therein. In this example, the guide member 15 is made of metal.

  As shown in FIG. 1, the member 15 is disposed at a predetermined position in the inner hole 11 </ b> A of the joint body 11. Specifically, the member 15 is disposed in the inner hole 11 </ b> A so as to be positioned between the hermetic packing 14 and the fireproof packing 16 in the direction along the central axis C <b> 11. An airtight packing 14 is arranged on the tube insertion direction side with respect to the member 15, and a fireproof packing 16 is arranged on the tube drawing direction side.

  At this time, the center axis C15 of the member 15 coincides with the center axis C11 of the joint body 11. Further, the member 15 is arranged so as to be movable in the direction along the central axis C11 with respect to the joint body 11.

  Further, in the state where the member 15 is disposed in the inner hole 11A, the front annular wall surface 15F is in contact with the airtight packing 14, and the rear annular wall surface 15R and the outer peripheral wall surface 15O are in contact with the fireproof packing 16. Be placed.

  The inner diameter of the member 15 (the distance from the central axis C15 of the member 15 to the inner peripheral wall surface 15I of the member 15) is larger than the outer diameter of the corrugated pipe 31. On the other hand, the outer diameter of the member 15 (the distance from the central axis C15 of the member 15 to the outermost outer peripheral wall surface 15OM of the member 15) is equal to the inner hole 11A of the joint body 11 in the region where the member 15 is disposed. It is slightly smaller than the diameter or approximately the same diameter.

<Fireproof packing>
The fireproof packing 16 is a ring-shaped member having a substantially rectangular cross section, as shown in FIG. Accordingly, the packing 16 has an inner hole 16A extending in the direction along the central axis C16 therein. In this example, the packing 16 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.

  The packing 16 is disposed at a predetermined position in the inner hole 11A of the joint body 11 as shown in FIG. Specifically, the packing 16 is disposed in the inner hole 11A so as to be positioned between the guide member 15 and the retainer 17 in the direction along the central axis C11. A guide member 15 is arranged on the tube insertion direction side with respect to the packing 16, and a retainer 17 is arranged on the tube drawing direction side.

  At this time, the central axis C <b> 16 of the packing 16 coincides with the central axis C <b> 11 of the joint body 11. Further, the packing 16 is disposed so as to be movable in a direction along the central axis C11 with respect to the joint body 11.

  Further, in the state where the packing 16 is disposed in the inner hole 11A, the front annular wall surface 16F and the inner circumferential wall surface 16I thereof are in contact with the guide member 15, and the rear annular wall surface 16R thereof is in contact with the retainer 17. Placed.

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

<Retainer>
As shown in FIG. 7D, the retainer 17 is a tubular member having a predetermined cross section. Accordingly, the retainer 17 has an inner hole 17A extending in the direction along the central axis C17 therein. In this example, the retainer 17 is formed from an elastically deformable material.

  Furthermore, the retainer 17 has a front end portion 17F, a rear end portion 17R, and a tapered wall surface 17T. The tapered wall surface 17T is provided between the front end portion 17F and the rear end portion 17R. The front end portion 17 </ 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. On the other hand, the rear end portion 17R is an end portion that pushes the indicator ring 19 in the tube drawing direction when the flexible pipe 3 is connected to the pipe joint 1.

  As shown in FIG. 1, the retainer 17 is disposed at a predetermined position in the inner hole 11 </ b> A of the joint body 11. Specifically, the retainer 17 is disposed in the inner hole 11A so as to be positioned between the fireproof packing 16 and the retainer stopper member 18 in the direction along the central axis C11. A fireproof packing 16 is arranged on the tube insertion direction side with respect to the retainer 17, and a retainer stopper member 18 is arranged on the tube drawing direction side.

  At this time, the central axis C17 of the retainer 17 coincides with the central axis C11 of the joint body 11. Furthermore, the retainer 17 is disposed so as to be movable in the direction along the central axis C11 with respect to the joint body 11.

  Further, in the state where the retainer 17 is disposed in the inner hole 11A, its front end portion 17F contacts the fireproof packing 16, its rear end portion 17R contacts the indicator ring 19, and its tapered wall surface 17T has a retainer stopper. It arrange | positions so that the taper wall surface 18T (refer FIG.7 (C)) of the member 18 may be contacted.

  The inner diameter of the front end portion 17F of the retainer 17 (the distance from the central axis C17 of the retainer 17 to the innermost wall surface 17FI of the end portion 17F) 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, the inner diameter is such that when the flexible pipe 3 is inserted into the pipe joint 1 and pulled in the pipe drawing direction, the tapered wall face 17T of the retainer 17 and the tapered wall face 18T of the retainer stopper member 18 (see FIG. 7C). ), The outer diameter of the corrugated pipe 31 becomes smaller.

  The inner diameter of the rear end portion 17R of the retainer 17 (the distance from the central axis C17 of the retainer 17 to the innermost wall surface 17RI of the end portion 17R) is larger than the outer diameter of the corrugated pipe 31. On the other hand, the outer diameter of the retainer 17 (the distance from the central axis C17 of the retainer 17 to the outermost wall surface 17O) is smaller than the diameter of the inner hole 11A of the joint body 11 in the region where the retainer 17 is disposed.

<Retainer stopper member>
As shown in FIG. 7C, the retainer stopper member 18 is a tubular member having a predetermined cross section. Therefore, the member 18 has an inner hole 18A extending in the direction along the central axis C18 therein. In this example, the member 18 is made of metal.

  As shown in FIG. 1, the member 18 is disposed at a predetermined position in the inner hole 11 </ b> A of the joint body 11. Specifically, the member 18 is disposed in the inner hole 11A so as to be positioned between the retainer 17 and the indicator ring 19 in a direction along the central axis C11. A retainer 17 is arranged on the tube insertion direction side with respect to the member 18, and an indicator ring 19 is arranged in the tube drawing direction. The member 18 is disposed such that its tapered wall surface 18T is positioned radially outward from the tapered wall surface 17T of the retainer 17.

  At this time, the center axis C18 of the member 18 coincides with the center axis C11 of the joint body 11. Further, the member 18 is fixed to the joint body 11 so as not to move relative to the joint body 11 in the direction along the central axis C11.

  Further, the member 18 is disposed such that the tapered wall surface 18T contacts the tapered wall surface 17T of the retainer 17 in a state where the member 18 is disposed in the inner hole 11A.

  The inner diameter of the member 18 (the distance from the central axis C18 of the member 18 to the innermost wall surface 18I of the member 18) is larger than the outer diameter of the corrugated pipe 31. On the other hand, the outer diameter of the member 18 (the distance from the central axis C18 of the member 18 to the outer peripheral wall surface 18O of the member 18) is approximately the diameter of the inner hole 11A of the joint body 11 in the region where the member 18 is disposed. equal.

<Indicator ring>
The indicator ring 19 is a tubular member having a predetermined cross section as shown in FIG. Therefore, the ring 19 has an inner hole 19A extending in the direction along the central axis C19. Furthermore, the ring 19 has an annular groove 19G extending on the entire outer periphery thereof. As shown in FIG. 1, the indicator member 20 is disposed in the groove 19G. In this example, the ring 19 is made of metal.

  As shown in FIG. 1, the ring 19 is disposed at a predetermined position in the inner hole 11 </ b> A of the joint body 11. Specifically, the ring 19 is disposed in the inner hole 11A so as to be positioned between the “retainer 17 and retainer stopper member 18” and the “nut 21” in the direction along the central axis C11. A retainer 17 and a retainer stopper member 18 are arranged on the tube insertion direction side with respect to the ring 19, and a nut 21 is arranged in the tube drawing direction.

  At this time, the central axis C19 of the ring 19 coincides with the central axis C11 of the joint body 11. Further, the ring 19 is arranged to be movable in a direction along the central axis C11 with respect to the joint body 11.

  Further, the ring 19 is disposed such that the front annular wall surface 19F contacts the retainer 17 in a state where the ring 19 is disposed in the inner hole 11A. In addition, the ring 19 is not in contact with the nut 21 and is spaced from the nut 21 by a predetermined distance before the connection of the flexible pipe 3 to the pipe joint 1 is completed. However, when the connection of the flexible pipe 3 to the pipe joint 1 is completed, the rear annular wall surface 19R of the ring 19 contacts the nut 21. The predetermined distance is such that the indicator member 20 is aligned with the viewing hole 11D (see FIG. 4) when the rear annular wall surface 19R of the ring 19 moves in the tube pulling direction with respect to the joint body 11 and contacts the nut 21. Distance.

  The inner diameter of the ring 19 (the distance from the central axis C19 of the ring 19 to the innermost wall surface 19I of the ring 19) is larger than the outer diameter of the corrugated pipe 31. On the other hand, the outer diameter of the ring 19 (the distance from the central axis C19 of the ring 19 to the outermost wall surface 19O of the ring 19) is the diameter of the inner hole 11A of the joint body 11 in the region where the ring 19 is disposed. It is equal to or slightly smaller than the diameter.

<Indicator member>
The indicator member 20 is a ring-shaped member having a substantially rectangular cross section as shown in FIG. Therefore, the member 20 has an inner hole 20A extending in the direction along the central axis C20 therein. In this example, the member 20 is made of rubber. The rubber forming the member 20 is preferably a colored rubber such as red so that it can be easily viewed from the viewing hole 11D (see FIG. 4).

  As shown in FIG. 1, the member 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 (see FIG. 7B) of the indicator ring 19.

  The inner diameter of the member 20 (the distance from the central axis C20 of the member 20 to the inner peripheral wall surface 20I of the member 20) is the distance to the bottom wall surface 19B (see FIG. 7B) of the annular groove 19G of the indicator ring 19 Is approximately equal to On the other hand, the outer diameter of the member 20 (the distance from the central axis C20 of the member 20 to the outer peripheral wall surface 20O of the member 20) is approximately the diameter of the inner hole 11A of the joint body 11 in the region where the member 20 is disposed. Equal or slightly larger.

<Nut>
As shown in FIG. 8C, the nut 21 is a tubular member having a predetermined cross section. Therefore, the nut 21 has an inner hole 21A extending in the direction along the central axis C21 therein. In this example, the nut 21 is made of metal.

  Furthermore, the nut 21 has two annular grooves 21G1 and 21G2 on the outer peripheral portion thereof. Each groove 21G1, 21G2 extends over the entire circumference of the nut 21. These grooves 21G1 and 21G2 are provided to be spaced from each other in the direction along the central axis C21. As shown in FIG. 1, the stop ring 22 is arrange | positioned in the groove | channel 21G1 provided in the pipe insertion direction side (right side in the figure) among these grooves. A watertight ring 23 is disposed in the groove 21G2 provided on the tube drawing direction side (left side in the figure).

  Further, as shown in FIG. 8C, the nut 21 also has one annular groove 21G3 on its inner peripheral portion. The groove 21G3 is provided closer to the tube drawing direction than the two grooves 21G1 and 21G2. As shown in FIG. 1, a watertight packing 26 is disposed in the groove 21G3.

  In addition, as shown in FIG. 8C, the nut 21 has one through hole 21P. The hole 21P is provided between the groove 21G1 and the groove 21G2 in the direction along the central axis C21. The hole 21P is formed so as to penetrate the nut 21 in a direction perpendicular to the central axis C21. As shown in FIG. 1, a selectively permeable member 25 is disposed in the hole 21P.

  As shown in FIG. 1, the nut 21 is attached to the joint body 11 such that a front portion 21 </ b> F (see FIG. 8C) is inserted into the inner hole 11 </ b> A of the joint body 11. Accordingly, the rear portion 21 </ b> R of the nut 21 is disposed outside the joint body 11. At this time, the center axis C <b> 21 of the nut 21 coincides with the center axis C <b> 11 of the joint body 11.

  The nut 21 is disposed along the central axis C1 with respect to the joint body 11 by disposing the stop ring 22 in the annular groove 21G1 of the nut 21 and the annular groove 11C of the joint body 11 (see FIG. 4A). It is attached to the joint body 11 so as not to move relative to the direction.

  The inner diameter of the nut 21 (the distance from the central axis C21 of the nut 21 to the inner peripheral wall surface 21I of the nut 21) is the outer diameter of the flexible tube 3 (the outer peripheral wall surface 32O of the covering 32 of the flexible tube 3 from the central axis C3 of the flexible tube 3). (Distance to (see FIG. 3)).

  On the other hand, the outer diameter of the front portion 21F of the nut 21 (the distance from the central axis C21 of the nut 21 to the outer peripheral wall surface 21FO of the portion 21F (see FIG. 8C)) is a joint in the region where the portion 21F is disposed. It is substantially equal to the inner diameter of the inner hole 11A of the main body 11. The outer diameter of the rear portion 21R of the nut 21 (the distance from the central axis C21 of the nut 21 to the outer peripheral wall surface 21RO of the portion 21R (see FIG. 8C)) is in the region where the front portion 21F of the nut 21 is disposed. The outer diameter of the joint body 11 (substantially equal to the outer peripheral wall surface 110 (see FIG. 4A) of the joint body 11 in the region where the front portion 21F of the nut 21 is disposed from the central axis C11 of the joint portion 11).

<Stop ring>
The stop ring 22 is a ring-shaped member having a substantially circular cross section, as shown in FIG. Therefore, the ring 22 has an inner hole 22A extending in the direction along the central axis C22 therein. In this example, the ring 22 is made of metal.

  Further, the ring 22 has a slit (not shown) in a part thereof. Thereby, the diameter of the ring 22 can be reduced when a load is applied from the outside.

  As shown in FIG. 1, the ring 22 is disposed in the inner hole 11 </ b> A of the joint body 11 in a state of being disposed in the annular groove 21 </ b> G <b> 1 of the nut 21.

  The inner diameter of the ring 22 (the distance from the central axis C22 of the ring 22 to the inner peripheral wall surface 22I of the ring 22) is smaller than the outer diameter of the front portion 21F of the nut 21.

  On the other hand, the outer diameter of the ring 22 (the distance from the central axis C22 of the ring 22 to the outer peripheral wall surface 22O of the ring 22) is larger than the inner diameter of the joint body 11 in the region where the ring 22 is disposed. Therefore, as described above, when the ring 22 is disposed in the inner hole 11A of the joint body 11, the annular groove 11C (see FIG. 4A) of the joint body 11 and the annular groove 21G1 ( (See FIG. 8C). Thereby, the nut 21 is made immovable from the joint body 11 in the tube drawing direction.

<Watertight ring>
The watertight ring 23 is an O-ring having a substantially circular cross section, as shown in FIG. Therefore, the ring 23 has an inner hole 23A extending in the direction along the central axis C23 therein. In this example, the watertight ring 23 is made of olefin rubber.

  As shown in FIG. 1, the ring 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 21 </ b> G <b> 2 (see FIG. 8C) of the nut 21.

  The inner diameter of the ring 23 (the distance from the central axis C23 of the ring 23 to the inner peripheral wall surface 23I of the ring 23) is the distance from the central axis C21 of the nut 21 to the bottom wall surface 21G2B of the annular groove 21G2 of the nut 21. Almost equal.

  On the other hand, the outer diameter of the ring 23 (the distance from the central axis C23 of the ring 23 to the outer peripheral wall surface 23O of the ring 23) is larger than the inner diameter of the inner hole 11A of the joint body 11 in the region where the ring 23 is disposed. Somewhat big. Accordingly, the ring 23 is in close contact with the inner peripheral wall surface 11I (see FIG. 4A) of the joint body 11 in a state where the ring 23 is disposed in the inner hole 11A of the joint body 11, and thereby the joint body 11 and the nut. A watertight seal is provided between the two.

<Disassembly ring>
As shown in FIG. 8D, the decomposition ring 24 is a ring-shaped member having a substantially rectangular cross section. Therefore, the ring 24 has an inner hole 24A extending in the direction along the central axis C24 therein. The ring 24 is a ring used for disassembling the pipe joint 1. In this example, the ring 24 is made of metal.

  As shown in FIG. 1, the ring 24 is attached to the joint body 11 in a state where the ring 24 is attached to the front portion 21F of the nut 21 (a state where the front portion 21F of the nut 21 is accommodated in the inner hole 24A of the ring 24). It is attached. At this time, the ring 24 is disposed between the rear end surface 11R (see FIG. 4A) of the joint body 11 and the front wall surface 21RF of the rear portion 21R of the nut 21.

  The inner diameter of the ring 24 (the distance from the central axis C24 of the ring 24 to the inner peripheral wall surface 24I of the ring 24) is substantially equal to the outer diameter of the front portion 21F of the nut 21. On the other hand, the outer diameter of the ring 24 (the distance from the central axis C24 of the ring 24 to the outer peripheral wall surface 24O of the ring 24) is the outer diameter of the rear portion 21R of the nut 21 (from the central axis C21 of the nut 21 to the same portion 21R). Is substantially equal to the distance to the outer peripheral wall surface 21RO.

<Selective permeability member>
As shown in FIG. 8A, the selectively permeable member 25 is a cylindrical member having a substantially rectangular cross section. The member 25 is formed from a porous material. The member 25 is disposed in the through hole 21P of the nut 21 (see FIG. 8C). The gas leaking from the flexible tube 3 and reaching the through hole 21 </ b> P can permeate the member 25. 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 25.

<Watertight packing>
The watertight packing 26 is a ring-shaped member having a substantially L-shaped cross section, as shown in FIG. Accordingly, the packing 26 has an inner hole 26 </ b> A extending in the direction along the central axis C <b> 26 therein. In this example, the packing 26 is made of olefin rubber.

  The packing 26 is disposed in the inner hole 11 </ b> A of the joint body 11 in a state of being disposed in the annular groove 21 </ b> G <b> 3 of the nut 21.

  The inner diameter of the packing 26 (the distance from the central axis C26 of the packing 26 to the innermost end portion 26I of the packing 26) is smaller than the outer diameter of the flexible tube 3. Accordingly, the ring 26 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 21.

  On the other hand, the outer diameter of the packing 26 (the distance from the central axis C26 of the packing 26 to the outer peripheral wall surface 26O of the packing 26) is the bottom wall surface 21G3B of the annular groove 21G3 of the nut 21 in which the packing 26 is disposed (FIG. 8). (See (C))).

<Flexible pipe>
As shown in FIG. 3, the flexible tube 3 includes a corrugated tube 31 and a coating 32. The corrugated tube 31 is a tubular 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 21 </ b> A of the nut 21 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, as shown in FIG. 9, the peak portion 31 </ b> T <b> 1 (see FIG. 3) of the corrugated tube 31 is the rear wall surface of the inner peripheral claw portion 13 </ b> I of the spring stopper member 13. 13IR (see FIG. 5).

  When the flexible tube 3 is further moved in the tube insertion direction, as shown in FIG. 10, the peak portion 31T1 of the corrugated tube 31 deforms the inner peripheral side claw portion 13I of the spring stopper member 13 radially outward. Then, the flexible tube 3 moves in the tube insertion direction so as to cross the inner peripheral claw portion 13I in the tube insertion direction.

  Next, when the crest portion 31T1 at the foremost portion of the corrugated tube 31 exceeds the inner peripheral claw portion 13I of the spring stopper member 13 in the tube insertion direction, the flexible tube 3 is pulled in the tube pulling direction, as shown in FIG. Further, the inner peripheral claw portion 13I of the spring stopper member 13 is formed by the outer peripheral wall surface 31O1 (see FIG. 3) between the “peak portion 31T1 at the most distal portion of the corrugated tube 31” and the “valley portion 31B1 adjacent thereto”. Pulled in the pulling direction. As a result, the spring stopper member 13 is deformed from the state shown in FIG. 5A to the state shown in FIG.

  As a result, as shown in FIG. 12, the outer peripheral claw portion 13O of the spring stopper member 13 comes out of the engagement groove 11B (see FIG. 4A) of the joint body 11. As a result, the coil spring 12 is released, and the coil spring 12 moves the retainer 17 in the tube drawing direction via the “spring stopper member 13, the airtight packing 14, the guide member 15, and the fireproof packing 16”.

  As a result, the retainer 17 moves in the tube pulling direction while the tapered wall surface 17T is in sliding contact with the tapered wall surface 18T of the retainer stopper member 18. During this movement, the front end portion 17I of the retainer 17 (see FIG. 7D) moves radially inward due to the action between the tapered wall surface 17T of the retainer 17 and the tapered wall surface 18T of the retainer stopper member 18. To do. That is, the inner diameter of the retainer 17 is reduced at the front end portion 17I. Thereby, the front end 17 </ b> I of the retainer 17 is engaged with the valley 31 </ b> B of the corrugated pipe 31.

  At the same time, the indicator ring 19 is moved in the tube drawing direction by the retainer 17 moving in the tube drawing direction. As shown in FIG. 13, the indicator ring 19, retainer 17, fireproof packing 16, guide member 15, airtight packing 14 and spring stopper member 13 are moved in the tube drawing direction as shown in FIG. 7B) is stopped by contacting the front annular end surface 21FF of the nut 21 (see FIG. 8C).

  Thereby, the connection of the flexible pipe 3 to the pipe joint 1 is completed. At this time, the indicator member 20 arranged in the indicator ring 19 is visible through the visual recognition hole 11D (see FIG. 4A) of the joint body 11.

  According to the present embodiment, it is assumed that the flexible tube 3 is pulled in the tube pulling direction before the peak portion 31T1 of the corrugated tube 31 crosses the inner peripheral claw portion 13I of the spring stopper member 13 in the tube insertion direction. However, the indicator ring 19 does not move in the tube pulling direction. Therefore, although the connection of the flexible pipe 3 to the pipe joint 1 is not completed, there is a low possibility that the connection is mistakenly completed.

  Further, when the corrugated pipe 31 reaches the hermetic packing 14, the crest 31T of the corrugated pipe 31 and the hermetic packing 14 come into strong contact with each other so that an airtight seal is formed between them. Therefore, at this time, when the flexible tube 3 is pulled in the tube pulling direction, a tensile force in the tube pulling direction is applied from the corrugated tube 31 to the hermetic packing 14. When the airtight packing 14 moves in the tube pulling direction due to this tensile force, the airtight packing 14 moves the indicator ring 19 in the tube pulling direction via the “guide member 15, fireproof packing 16 and retainer 17”. There is a possibility that the rear annular wall surface 19 of the 19 will move until it contacts the front annular wall surface 21FF of the nut 21. According to this, although the connection of the flexible pipe 3 to the pipe joint 1 is not completed (inadequate), the indicator member 20 can be visually recognized through the visual recognition hole 11D of the joint main body 11. End up.

  However, before the crest 31T1 at the foremost portion of the corrugated tube 31 crosses the inner peripheral claw portion 13I of the spring stopper member 13 in the tube insertion direction, the airtight packing 14 is connected to the outer peripheral claw portion 13O of the spring stopper member 13 and the joint. The main body 11 is locked to the joint main body 11 by engagement with the engaging groove 11B. Therefore, even if the flexible tube 3 is pulled out in the tube pulling direction before the peak portion 31T1 of the corrugated tube 31 crosses the inner peripheral claw portion 13I of the spring stopper member 13 in the tube insertion direction, the airtight packing It is unlikely that 14 will move in the tube withdrawal direction. For this reason, when the connection of the flexible pipe 3 to the pipe joint 1 is not completed (it is inadequate), the possibility of visually recognizing the indicator member 20 through the visual recognition hole 11D of the joint main body 11 is low.

  In addition, in the present embodiment, the watertight packing 26 is in frictional contact with the flexible tube 3. Therefore, when the flexible pipe 3 is pulled in the pipe pulling direction after the flexible pipe 3 is brought into frictional contact with the packing 26, the packing 26 receives a force in the pipe pulling direction. For this reason, when the nut 21 is not fixed to the joint body 11, when the flexible pipe 3 is pulled in the pipe drawing direction as described above, the nut 21 is also relatively relative to the joint body 11 in the pipe drawing direction. There is a possibility of moving.

  If the indicator member 20 is attached to the nut 21 and the indicator member 20 is exposed to the outside by the movement of the nut 21 in the tube pulling direction, the connection of the flexible pipe 3 to the pipe joint 1 is performed. Although it is not completed, the indicator member 20 is exposed to the outside. In this case, it is mistaken that the connection of the flexible pipe 3 to the pipe joint 1 is completed.

  However, in the above embodiment, the nut 21 is fixed to the joint body 11 so as not to move relative to the joint body 11 in the tube drawing direction. Therefore, it is not mistaken that the connection of the flexible pipe 3 to the pipe joint 1 is completed.

  Further, in the above embodiment, the indicator member 20 is not attached to the nut 21. Therefore, even if the nut 21 is movable relative to the joint body 11 in the pipe drawing direction, it is not mistaken that the connection of the flexible pipe 3 to the pipe joint 1 is completed.

  In the above embodiment, the spring stopper member 13 is directly locked to the joint body 11, but may be configured to be locked to a member fixed to the joint body 11.

  Furthermore, in the said embodiment, the movement of the said pipe | tube in the pipe extraction direction after the flexible pipe | tube 3 is inserted to the predetermined position in the inner hole 11A of the coupling main body 11 (the corrugated pipe | tube 31 is the inner peripheral side of the spring stopper member 13). The movement of the tube in the tube pulling direction after exceeding the claw portion 13I in the tube insertion direction) unlocks the outer peripheral claw portion 13O of the spring stopper member 13 with respect to the joint body 11.

  However, the movement of the tube in the tube insertion direction after the flexible tube 3 is inserted to a predetermined position in the inner hole 11A of the joint body 11 causes the outer claw portion 13O of the spring stopper member 13 to be locked to the joint body 11. May be released.

  As can be understood from the above description, one of the inventions of the present application is a pipe joint 1 to which a pipe is connected, and the pipe (for example, the flexible pipe 3) is moved to a predetermined position in the inner hole 1A of the pipe joint. After the insertion (for example, after the flexible tube 3 is inserted into the inner hole 1A of the pipe joint 1 until the most distal end portion 31T1 of the corrugated tube 31 exceeds the inner peripheral claw portion 13I of the spring stopper member 13 in the tube insertion direction). The present invention relates to a pipe joint in which the pipe is connected to the pipe joint by moving the pipe in the direction of pulling out the pipe.

  In the above embodiment, by moving the flexible tube 3 in the tube pulling direction, the locking of the spring stopper member 13 with respect to the joint main body 11 is released, and as a result, the retainer 7 is moved by the restoring force of the coil spring 12. The corrugated tube 31) is engaged. Then, the connection of the flexible pipe 3 to the pipe joint 1 is completed by pulling the flexible pipe 3 in the pipe drawing direction. Therefore, this is synonymous with “the pipe is connected to the pipe joint by moving the pipe in the direction of pulling out the flexible pipe 3”.

  The pipe joint of the present invention has a movable member (for example, a spring stopper member 13, a coil spring 12, an airtight packing 14, a guide member 15, a fireproof packing 16, a retainer) that is movable by moving the pipe in the direction of pulling out the pipe. 17, an indicator ring 19 and an indicator member 20).

  In the present invention, after the pipe is inserted to a predetermined position in the inner hole of the pipe joint, the moving member is moved more than a predetermined amount by moving the pipe in the pulling direction. The pipe is connected to the pipe joint by movement. Further, before the pipe is inserted to the predetermined position, the member to be moved is not moved by the movement of the pipe in the pulling direction so as to move more than the predetermined amount. Or “member fixed to the main body”.

  On the other hand, the movable member is released from the locking of the main body of the pipe joint or the member fixed to the main body by the movement of the pipe after the pipe is inserted to the predetermined position. Then, it becomes possible to move more than the predetermined amount in the tube drawing direction.

  According to this, when the connection of the pipe to the pipe joint is not completed (is insufficient), the possibility of visually recognizing that the connection of the pipe to the pipe joint is complete is low.

  Furthermore, another invention of the present application is a pipe joint 1 to which a pipe is connected, and a direction in which the pipe (for example, a flexible pipe) is pulled out after being inserted to a predetermined position in an inner hole of the pipe joint. The pipe is connected to the pipe joint by moving the pipe. And the pipe joint of the present invention is a movable member (for example, a spring stopper member 13, a coil bar 12, an airtight packing 14, a guide member 15, a refractory packing 16, which can be moved by moving the pipe in the direction of pulling out the pipe. A retainer 17, an indicator ring 19, an indicator member 20), and a joint member (for example, a watertight packing 26) that can be “frictionally contacted or engaged” with the tube before the tube is inserted into the predetermined position. To do. In the above embodiment, the nut 21 is in frictional contact with the flexible pipe 3 via the watertight packing 26, so the nut 21 is also a joint member in the present invention.

  In the present invention, after the pipe is inserted to a predetermined position in the inner hole of the pipe joint, the moving member is moved more than a predetermined amount by moving the pipe in the pulling direction. The pipe is connected to the pipe joint by movement. Further, the “joint body (for example, the main body of the pipe joint) (for example, so as not to move more than the predetermined amount by the movement of the pipe in the pulling direction” before and after the pipe is inserted to the predetermined position. , Joint body 11) ”or“ member fixed to the body ”. In addition, in the said embodiment, since the packing 26 is being fixed to the coupling main body 11 via the nut 21 and the stop ring 22, the packing 26 is synonymous with being fixed to the main body of the pipe coupling in this invention. is there.

  According to this, when the connection of the pipe to the pipe joint is not completed (is insufficient), the possibility of visually recognizing that the connection of the pipe to the pipe joint is complete is low.

  Further, the moved member is a seal member (airtight packing 14) for providing a seal with the pipe, or an indicator member (indicator ring 19, indicator member 20) for indicating the completion of connection of the pipe to the pipe joint. Or an engaging member (retainer 17) that engages with the tube.

  Alternatively, the member to be moved is a holding member (spring stopper member 13) that holds the coil spring 12 for moving the member to be moved in a compressed state before the tube is moved to the predetermined position before the tube is moved. ).

  In addition, the holding member holds the coil spring in a compressed state without elastic deformation before the tube moves to the predetermined position after the tube is inserted to the predetermined position, and the tube is inserted to the predetermined position. The holding member is unlocked from the main body of the pipe joint by being deformed by the movement of the pipe after the end.

  DESCRIPTION OF SYMBOLS 1 ... Pipe joint, 3 ... Flexible pipe, 11 ... Joint main body, 12 ... Coil spring, 13 ... Spring stopper member, 13O ... Outer peripheral side claw part, 13I ... Inner peripheral side claw part, 14 ... Airtight packing, 15 ... Guide member, 16 ... Fireproof packing, 17 ... Retainer, 18 ... Retainer stopper member, 19 ... Indicator ring, 20 ... Indicator member, 21 ... Nut, 22 ... Stop ring, 23 ... Watertight ring, 24 ... Disassembly ring, 25 ... Selective permeability member, 26 ... Watertight packing, 31 ... Corrugated tube, 32 ... Coating

Claims (5)

A pipe joint to which a pipe is connected, and the pipe is connected to the pipe joint by moving the pipe in the direction of pulling out the pipe after inserting the pipe to a predetermined position in the inner hole of the pipe joint. Pipe fittings
A movable member movable by moving the pipe in the direction of pulling out the pipe;
After the pipe is inserted to a predetermined position in the inner hole of the pipe joint, the moving member is moved more than a predetermined amount by the movement of the pipe in the pulling direction, and the pipe is moved by the movement of the moving member. Is connected to the fitting,
The movable member is a main body of the pipe joint or a member fixed to the main body so as not to move more than the predetermined amount due to movement of the pipe in the drawing direction before the pipe is inserted to the predetermined position. The movement of the pipe after the pipe has been inserted to the predetermined position is released from the lock of the movable member with respect to the main body of the pipe joint or the member fixed to the main body, It is configured to be able to move more than the predetermined amount in the tube pulling direction,
Pipe fittings. A pipe joint to which a pipe is connected, and the pipe is connected to the pipe joint by moving the pipe in the direction of pulling out the pipe after inserting the pipe to a predetermined position in the inner hole of the pipe joint. Pipe fittings
A movable member movable by movement of the tube in the direction of pulling out the tube, and a joint member capable of frictional contact or engagement with the tube before the tube is inserted to the predetermined position;
After the pipe is inserted to a predetermined position in the inner hole of the pipe joint, the moving member is moved more than a predetermined amount by the movement of the pipe in the pulling direction, and the pipe is moved by the movement of the moving member. Is connected to the fitting,
The joint member is fixed to the main body of the pipe joint or the main body so as not to move more than the predetermined amount by the movement of the pipe in the pulling direction before and after the pipe is inserted to the predetermined position. Fixed to the member,
Pipe fittings. In the pipe joint according to claim 1 or 2,
The moved member is a seal member that provides a seal with the tube, a display member that displays the completion of connection of the tube to the tube joint, or an engagement member that engages with the tube. Pipe fittings. In the pipe joint according to claim 1 or 2,
The said movable member is a pipe joint which is a holding member which hold | maintains the coil spring for moving the said movable member in a compression state before the movement of the said pipe | tube after the said pipe | tube is inserted to the said predetermined position. In the pipe joint according to claim 4,
The holding member is
Holding the coil spring in a compressed state without elastic deformation before the tube moves after the tube is inserted to the predetermined position;
By being deformed by the movement of the pipe after the pipe is inserted to the predetermined position, the holding member is released from being locked to the main body of the pipe joint.
Constructed as a pipe fitting.

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